Bionic temporary plugging device and preparation method and temporary plugging process thereof

Abstract

The invention provides a bionic temporary plugging device and a preparation method and a temporary plugging process thereof. The temporary plug comprises a wrapping layer, a filling material, a rigid temporary plugging ball, a fixing rod and a clamping ring, the wrapping layer comprises a head part and a beard part, the head part is of a hollow structure, the beard part is composed of a plurality of strip-shaped bodies, and the head part and the beard part are separated through a clamping ring; the rigid temporary plugging ball is located in the head of the wrapping layer, and the filling material comprises high-water-absorption polyacrylamide and irregular rigid particles which are alternately distributed in the head of the wrapping layer; one end of the fixing rod is connected with the rigid temporary plugging ball, and the other end penetrates through the clamping ring and is fixed by the clamping ring. The invention further provides a preparation method and a temporary plugging process of the bionic slug. The jellyfish bionic temporary plug adopts a jellyfish bionic structure, self-adaptive plugging is carried out on the eroded shot hole by utilizing the characteristics of easy deformation and large hydrodynamic radius of the jellyfish bionic structure, and the jellyfish bionic temporary plug has the characteristics of high pressure bearing and strong setting, and can adapt to perforation holes of different specifications.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploitation, and in particular to a bionic temporary plugging and a preparation method and a temporary plugging process thereof. Background Art

[0002] The multi-cluster fracturing technology of horizontal wells is an effective means of transformation for the development of unconventional oil and gas resources. Theory and practice have confirmed that the more hydraulic fractures are formed, the more complex the fractures are, the higher the degree of reservoir transformation and the higher the production capacity. However, due to the strong heterogeneity of the reservoir and the interference effect of stress between fractures, the multiple clusters of fractures in the horizontal well section cannot be fractured at the same time, the expansion of multiple clusters of fractures is extremely uneven, and the overall degree of reservoir transformation is low. The multi-stage temporary plugging and diversion fracturing technology based on perforation temporary plugging is considered to be an effective means to increase the complexity of fractures and promote the uniform expansion of fractures in the section. It injects temporary plugging and plugging perforations in the wellbore, forcing the fluid in the wellbore to turn to the unfractured area, promoting the uniform expansion of multiple clusters of fractures in the horizontal wellbore, thereby achieving the purpose of increasing the overall transformation range of the reservoir.

[0003] At present, temporary plugging balls and temporary plugging knots are commonly used in the actual fracturing process on site. During the fracturing process, the high-speed injection of proppant will cause erosion and wear on the perforation holes, thus forming irregular perforation holes, and conventional rigid temporary plugging balls cannot effectively plug irregular holes. At the same time, affected by temporary plugging processes such as stopping the pump, the temporary plugging balls are easy to fall off the holes. In addition, the hydrodynamic radius of conventional temporary plugging balls is small, and its plugging efficiency is relatively low. Temporary plugging knots can solve the problem of irregular holes and have a larger hydrodynamic radius, but their pressure bearing performance is lower than that of temporary plugging balls, and they are prone to deformation and enter the formation through the holes, causing temporary plugging failure.

[0004] Therefore, it is of great significance to the art to develop a temporary plugging ball with high pressure bearing capacity, strong sealing performance and adaptability to perforation holes of different specifications. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a bionic temporary plugging and its preparation method and temporary plugging process. The bionic temporary plugging adopts the jellyfish bionic structure, and uses its easy deformation and large hydrodynamic radius to adaptively plug the eroded blasthole. It has the characteristics of high pressure bearing and strong sealing, and can adapt to perforation holes of different specifications.

[0006] In order to achieve the above object, the present invention provides a bionic temporary plugging, which includes a wrapping layer, a filling material, a rigid temporary plugging ball, a fixing rod and a clamping ring;

[0007] The wrapping layer includes a head and a whisker, the head is a hollow structure, the whisker is composed of a plurality of strips, and the head and the whisker are separated by a clamp ring;

[0008] The rigid temporary blocking ball is located inside the head of the wrapping layer; the filling material includes highly absorbent polyacrylamide and irregular rigid particles, and the highly absorbent polyacrylamide and the irregular rigid particles are alternately distributed inside the head of the wrapping layer;

[0009] One end of the fixing rod is connected to a rigid temporary blocking ball, and the other end passes through a fixing ring and is fixed by a clamping ring.

[0010] Many organisms in nature have very strong environmental adaptability and have outstanding structural advantages in some aspects. Jellyfish is a common aquatic plankton in the ocean. Its special structure allows it to drift quickly with the water flow. The present invention uses the structural characteristics formed by biological evolution to improve the temporary plugging ball. Specifically, when the above-mentioned bionic temporary plug contacts water, the polyacrylamide in the wrapping layer will quickly absorb water and swell, causing the temporary plug to expand and deform, and its appearance is similar to that of a jellyfish, such as Figure 1 This shape can give the bionic temporary plug excellent suspension performance and a larger hydrodynamic radius.

[0011] In the above-mentioned bionic temporary plugging, the head of the wrapping layer is a hollow cylinder, the diameter of the cylinder can be controlled to be 2-3 times the diameter of the rigid temporary plugging ball, and the total length of the head and the whiskers can be controlled to be 2-3 times the diameter of the cylinder.

[0012] In the above bionic temporary plugging, the head of the wrapping layer can be a cylinder (i.e., a hollow cylinder) with one end open and the other end closed, and the whiskers are composed of a plurality of strips extending outward from the open end of the cylinder. The head and whiskers can be an integral structure, separated into different areas by a clamp ring.

[0013] In the above-mentioned bionic temporary plugging, the material (i.e., raw material) of the wrapping layer is a flexible material, such as cloth, and can further be a degradable cloth. The use of degradable cloth can make the wrapping layer completely degraded after the fracturing is completely completed, without the need for recycling. The material of the degradable cloth can specifically include polylactic acid (PLA) or polyglycolide (PGA). Polylactic acid has economic advantages, while polyglycolide has a fast degradation rate and is suitable for working conditions that require rapid flowback or downhole temperatures below 80°C. The present invention has no special restrictions on the specific type of polyglycolide used in the wrapping layer, as long as it can be degraded in the well.

[0014] In the above-mentioned bionic temporary plugging, the thickness of the wrapping layer can be controlled to be 0.1 mm-0.2 mm.

[0015] In the above-mentioned bionic temporary blocking, the wrapping layer may have meshes, and the mesh aperture may be controlled to be 100-200 meshes, for example, 100-120 meshes.

[0016] In some specific embodiments, when the material of the wrapping layer is cloth, the thickness of the cloth can be 0.1 mm-0.2 mm, and the mesh size of the cloth is 100-120 meshes.

[0017] In the above-mentioned bionic temporary plugging, the formation process of the wrapping layer can be: the raw material of the wrapping layer is formed into a hollow cylinder (specifically, it can be formed by bending or sewing) with one end closed and the other end open, and a snap ring line is marked as the boundary between the head and the whisker according to the designed head length (the total length of the cylinder is 2 to 3 times the diameter of the cylinder, the length of the whisker is 2 to 3 times the diameter of the rigid temporary plugging ball, and the head length is the difference between the total length of the cylinder and the length of the whisker) as the boundary between the head and the whisker, and the raw material of the wrapping layer is cut into a number of strips along the open end of the cylinder to the snap ring line, and the length of the strips is adjusted according to the designed length of the whisker.

[0018] In some specific embodiments, when the material of the wrapping layer is cloth, the wrapping layer can be made of cloth (such as degradable cloth) processed by weaving method by cutting and sewing. Conventional weaving methods of cloth include weaving and knitting. Knitted cloth has good elasticity, while woven cloth has a more regular mesh structure and higher strength. The present invention preferably uses woven degradable cloth so that the bionic temporary plugging can better meet the needs of pressure bearing and other aspects, and meet the requirements for the mechanical strength of the wrapping layer when the highly absorbent polyacrylamide breaks after absorbing water.

[0019] The present invention has found that a longer whisker can improve the suspension performance of the temporary plug; however, if the whisker is too long, it may increase the difficulty of going down the well in actual use, and may also cause the temporary plug to tangle into a ball. The length of the whisker of the wrapping layer in the present invention (i.e., the length of the strips that make up the whisker) can be controlled to be 2-3 times the diameter of the rigid temporary plugging ball, which can ensure that the bionic temporary plug has good suspension and can be used normally down the well.

[0020] In the above bionic temporary plugging, by adjusting the width of the strip in the whisker, the fluidity and buoyancy of the bionic temporary plugging can be adjusted, and the strips can be prevented from being entangled with each other. The width of the strip can be adjusted according to the specific application scenario. For example, in some specific embodiments, the width of the strip in the whisker can be 5mm-10mm, but is not limited to this range.

[0021] In the above-mentioned bionic temporary blocking, the filling material is generally located inside the head of the wrapping layer, and can be further filled between the rigid temporary blocking ball and the head of the wrapping layer.

[0022] In the above bionic temporary plugging, the filling material includes highly absorbent polyacrylamide (SAP) and irregular rigid particles. The highly absorbent polyacrylamide has a water absorption multiple of 50-200 times, for example, 50-100 times.

[0023] In the above-mentioned bionic temporary plugging, the highly absorbent polyacrylamide and the irregular rigid particles are generally evenly and alternately distributed inside the head of the wrapping layer. Through the above-mentioned distribution method, it can be ensured that the irregular rigid particles migrate together with the highly absorbent polyacrylamide.

[0024] Among the filling materials used in the present invention, SAP material is a highly water-absorbent material, which will swell rapidly after absorbing water, but the strength of the material will also decrease rapidly; irregular rigid particles themselves do not have good migration performance, and are easily stuck and lose migration performance due to accumulation, but in the case of SAP around, irregular rigid particles can have good migration performance, and when SAP is squeezed out of the wrapping layer, the migration performance of irregular rigid particles will become very poor. Therefore, under the high pressure during fracturing construction, the SAP that has swelled after absorbing water will be very easily squeezed out of the holes of the wrapping layer, and the irregular rigid particles in the adaptive bionic temporary plugging will also migrate due to pressure, thereby realizing the adaptive deformation of the adaptive bionic temporary plugging.

[0025] In the above-mentioned bionic temporary plugging, the particle size of the highly absorbent polyacrylamide can be controlled to be 60-100 mesh, for example, it can be specific values ​​such as 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, and a range with any two of the above specific values ​​as endpoints, and can further be 60 mesh-80 mesh.

[0026] In the above-mentioned bionic temporary plugging, the material of the irregular rigid particles includes amorphous polyglycolide (PGA). PGA has excellent degradation performance, high mechanical strength and melting point (melting point exceeds 210°C), and PGA also has a faster crystallization rate, and amorphous PGA is not common. Amorphous PGA has poor heat resistance, and its glass transition temperature is about 40°C. Once the external temperature approaches its glass transition temperature, the amorphous PGA will become soft and sticky, and begin to crystallize. Taking advantage of its low glass transition temperature and fast crystallization rate, after the amorphous polyglycolide is pressed and placed in an underground temperature environment above 60°C, it can be quickly crystallized within 10 minutes and bonded into a hard block with a short-term high temperature resistance of more than 150°C, and the crystallization rate increases with the increase of ambient temperature. When the above-mentioned amorphous PGA is used in fracturing and plugging construction, when the hole is heated to above the glass transition temperature of PGA, the PGA particles can crystallize into blocks and quickly plug the hole.

[0027] In the above-mentioned bionic temporary plugging, the particle size of the irregular rigid particles is 6-40 mesh, for example, 6 mesh, 10 mesh, 20 mesh, 30 mesh, 40 mesh and other specific values ​​and a range with any two of the above specific values ​​as endpoints. Compared with regular rigid particles, irregular rigid particles have better blocking performance. In some specific embodiments, the irregular rigid particles can be obtained by crushing rigid particles (such as amorphous PGA materials) with conventional crushing equipment (such as a roller cutter crusher).

[0028] In the above bionic temporary plugging, the volume, size and density of the filling material can be adjusted by adjusting the amount of highly absorbent polyacrylamide, thereby adjusting the suspension of the bionic temporary plugging. In some specific embodiments, the amount of the highly absorbent polyacrylamide can be 2g-4g.

[0029] In the above bionic temporary plugging, the plugging performance of the bionic temporary plugging can be adjusted by adjusting the amount of irregular rigid particles. In some specific embodiments, the amount of the irregular rigid particles is 30g-60g.

[0030] In the above-mentioned bionic temporary plugging, the head and the whisker in the wrapping layer are formed as one piece, and the two are separated by a clamping ring to prevent the filling material located in the head from entering the whisker.

[0031] In the above-mentioned bionic temporary plugging, the material of the clamp ring includes a soluble material, preferably a soluble magnesium alloy. By adopting a soluble material, the clamp ring can be ensured to dissolve in water to avoid reservoir damage. The clamp ring can be a formed ring sleeve arranged on the wrapping layer, or a ring formed by a filament wrapped around the separation of the head and the whisker (or: clamp line).

[0032] In the above-mentioned bionic temporary blockage, the wire diameter of the clamping ring may be 2mm-4mm, for example, 3mm-4mm.

[0033] In some specific embodiments, the manufacturing method of the clasp can be: a soluble magnesium alloy wire with a wire diameter of 2-4 mm is bent and tightened in clean water to wrap around the clasp wire between the head and the whisker to achieve the clasp fixation. Figure 2 As shown, the soluble magnesium alloy wire can be bent into a C shape and then gradually tightened along the clamping ring line to complete the clamping ring fixation.

[0034] In the above bionic temporary plugging, the diameter of the rigid temporary plugging ball can be adjusted according to the size of the general perforation and the size of the perforation after flushing. In some specific embodiments, the diameter of the rigid temporary plugging ball can be controlled to be 19mm-26mm, and the rigid temporary plugging ball in this diameter range can be suitable for perforations with an initial diameter of about 10mm.

[0035] In the above-mentioned bionic temporary plugging, the material of the rigid temporary plugging ball includes polylactic acid and / or polyglycolide. In some specific embodiments, the rigid temporary plugging ball can be formed by injection molding of the above-mentioned materials. The present invention has no special restrictions on the specific type of polyglycolide used in the rigid temporary plugging ball, as long as it can be degraded in the well.

[0036] In the above-mentioned bionic temporary plugging, the fixing rod can ensure that the rigid temporary plugging ball is always covered by the filling layer material, and ensure that a certain amount of filling material will enter the perforation when the bionic temporary plugging is working, and get stuck on the inner wall of the perforation, so as to prevent the temporary plugging from falling off from the perforation after the pump is stopped. One end of the fixing rod is connected to the clamping ring, and the other end is fixed by the clamping ring, which can ensure that the position of the rigid temporary plugging ball in the wrapping layer is fixed. The end of the fixing rod that passes through the clamping ring is usually located in the middle of the whisker to ensure that the whisker can be fully dispersed in the liquid environment to avoid entanglement, and ensure the suspension of the temporary plugging.

[0037] In the above bionic temporary blocking, the diameter of the fixing rod is 1.5-2.5 mm, which can ensure the support of the fixing rod for the rigid temporary blocking ball and will not occupy too much of the rigid temporary blocking ball surface.

[0038] In the above bionic temporary plugging, the material of the fixing rod may include polylactic acid and / or polyglycolide. In some specific embodiments, the material of the fixing rod may be the same as that of the rigid temporary plugging ball.

[0039] In the above-mentioned bionic temporary plugging, the length of the fixing rod outside the rigid temporary plugging ball (i.e., the length of the part of the fixing rod extending out of the rigid temporary plugging ball, which can be used as the effective length of the fixing rod) is 1-2 times the diameter of the rigid temporary plugging ball. By controlling the effective length range of the fixing rod, it is possible to avoid the problem of poor fixing effect due to a fixing rod being too short, and the problem of the fixing rod being too long to hinder the bionic temporary plugging from entering the eyelet.

[0040] The present invention also provides a method for preparing the above-mentioned bionic temporary plugging, wherein the preparation method comprises:

[0041] Step 1, drilling a hole on the surface of the rigid temporary plugging ball, inserting one end of the fixing rod into the hole to connect with the rigid temporary plugging ball;

[0042] Step 2, using the raw material of the wrapping layer to form a hollow structure with one end closed and the other end open, and marking a clamping ring line according to the designed length of the head, the clamping ring line being the boundary between the head and the whisker;

[0043] Step 3, filling material and rigid temporary plugging balls are placed inside the closed end of the wrapping layer to form a head; the end of the fixing rod that is not located at the rigid temporary plugging balls is located in the middle of the open end of the wrapping layer;

[0044] Step 4, fixing the clamp ring to the clamp ring line, and passing the fixing rod through the clamp ring to obtain the bionic temporary blockage;

[0045] In the above preparation method, step 2 or step 4 includes: cutting the raw material of the wrapping layer into a plurality of strips along the opening end to the clamping ring line to form whiskers. That is, the whiskers can be formed before or after the clamping ring is fixed.

[0046] In the above preparation method, there is no restriction on the order of step 1 and step 2, and they can also be carried out simultaneously.

[0047] In some specific embodiments, holes are punched on the surface of the rigid temporary blocking ball. The diameter of the hole can match the diameter of the fixing rod. The depth of the hole can be adjusted according to the length of the fixing rod as long as the connection between the fixing rod and the rigid temporary blocking ball is firm. For example, it can be 3 mm.

[0048] In some specific embodiments, by controlling the length of the fixing rod passing through the clamp ring, it is possible to prevent the fixing rod from being too long to enter the eyelet, and the fixing rod from being too short to slip out of the clamp ring. The length of the fixing rod passing through the clamp ring (i.e., the distance between the end of the fixing rod that is not connected to the rigid temporary plugging ball and the clamp ring) can be 2 mm to 3 mm.

[0049] In some specific embodiments, the preparation method of the above-mentioned bionic temporary blockage may specifically include:

[0050] 1. Drill a hole on the surface of the rigid temporary plugging ball (the hole diameter matches the diameter of the fixed rod), and connect the rigid temporary plugging ball to the fixed rod by applying adhesive in the hole, and at the same time control the length of the fixed rod extending out of the rigid temporary plugging ball to be 1-2 times the diameter of the rigid temporary plugging ball (if the fixed rod has excess length, it can be removed);

[0051] 2. Use the raw material of the wrapping layer to form a hollow cylinder with one end closed and the other end open. The diameter of the cylinder is 2-3 times the diameter of the rigid temporary plugging ball. According to the designed length of the head (the total length of the cylinder is 2-3 times the diameter of the cylinder, the length of the whisker is 2-3 times the length of the rigid temporary plugging ball, and the length of the head is the difference between the total length of the cylinder and the length of the whisker), mark the clamping ring line between the two ends of the wrapping layer material as the boundary between the head and the whisker;

[0052] 3. Fill the closed end of the wrapping layer with filling material (highly absorbent polyacrylamide and irregular rigid particles), and install the rigid temporary plugging ball connected with the fixing rod into the closed end of the wrapping layer so that the filling material is located between the rigid temporary plugging ball and the wrapping layer to form the head of the wrapping layer;

[0053] 4. Pass the clamp ring through the fixing rod and fix it on the clamp ring line, adjust the length of the fixing rod passing through the clamp ring, and then tighten the clamp ring to close the internal space of the head and prevent the filling material from falling out of the head;

[0054] 5. Cut the raw material at the open end of the wrapping layer into strips as whiskers to obtain a bionic temporary plugging.

[0055] The present invention also provides a fracturing process, namely a seam temporary plugging fracturing process, which is carried out by using the above-mentioned bionic temporary plugging.

[0056] During fracturing construction, the bionic temporary plug will swell immediately when it contacts the water in the oil and gas well (it can also be soaked in water before going down the well), and will be transformed into a temporary plug close to the shape of a jellyfish (the head of the wrapping layer is similar to the head of a jellyfish, and the whiskers of the wrapping layer are similar to the tentacles of a jellyfish). Its special structure has a large hydrodynamic radius and excellent suspension performance, so the plugging efficiency is high. At the perforation downhole, the "tentacles" of the temporary plug (i.e., the whiskers of the wrapping layer) will most likely enter the perforation first, and then part of the highly absorbent polyacrylamide will be squeezed out of the wrapping layer (generally directly into the well) after absorbing water and the strength decreases. Some of the rigid irregular particles used as the filling layer material will migrate into the perforation, and the temporary plug will be deformed as a whole and embedded in the perforation, but due to the obstruction of the rigid temporary plugging ball, the temporary plug will not pass through the perforation as a whole. After the pump is stopped during fracturing construction, the temperature at the perforation gradually recovers and rises to above the glass transition temperature of PGA. The irregular rigid particles (amorphous PGA particles) in the compacted state that temporarily block the inside will quickly bond together and crystallize, becoming rigid, heat-resistant, and non-detachable plugs plugged on the perforation. At this time, fracturing construction can be started on the next layer of formation without putting in a new bridge plug, thereby improving work efficiency and reducing construction costs.

[0057] The beneficial effects of the present invention include:

[0058] 1. The external structure of the bionic temporary plugging provided by the present invention adopts a jellyfish bionic structure, which has a larger hydrodynamic radius and better suspension performance. It utilizes its easy deformation and large hydrodynamic radius to adaptively block the eroded blastholes, and has a high blocking rate. The bionic temporary plugging overcomes the problems of easy falling off, poor suspension ability, and poor pressure bearing capacity of the temporary plugging knot of the conventional temporary plugging ball. During the temporary plugging process, a unique adaptive structure is utilized to achieve efficient blocking of the eroded blastholes. The present invention draws on the structural characteristics formed by biological evolution to improve the temporary plugging ball, providing a new development idea for temporary plugging technology.

[0059] 2. The rigid temporary plugging ball of the bionic temporary plugging provided by the present invention is connected to a fixed rod, which is fixed on a clamping ring, so as to ensure that the rigid temporary plugging ball is always in the filling layer material after the temporary plugging expands by absorbing water, and can effectively avoid the premature seating of the rigid temporary plugging ball, thereby ensuring the good overall deformability of the temporary plugging and the mobility of the rigid irregular particles, which is beneficial to the plugging of irregular perforations and also beneficial to the temporary plugging after deformation being stuck in the perforations.

[0060] 3. The bionic temporary plugging filling material provided by the present invention is compounded with highly absorbent polyacrylamide and irregular amorphous PGA particles, making full use of the advantages of highly absorbent polyacrylamide that it can quickly expand when absorbing water and has low strength after expansion, and the advantages of amorphous PGA that can quickly bond and crystallize when heated in a compacted state. Not only does it make the temporary plugging easy to deform, but it will also change to an overall rigid and heat-resistant state when heated after deformation, which can effectively block the perforation, and it is not easy to fall off from the perforation after the pump is stopped. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the structure of bionic temporary blockage in each embodiment.

[0062] Figure 2 Detailed views of the installation of the snap rings in various embodiments.

[0063] Figure 3 It is a schematic diagram of the structure of the wrapping layer before cutting in each embodiment.

[0064] Figure 4 Schematic diagram of the processing process of the wrapping layer in each embodiment.

[0065] Figure 5 Schematic diagram of the structure of the rigid temporary blocking ball and the fixing rod in each embodiment.

[0066] Figure 6 Schematic diagram of the device for evaluating temporary plugging pressure bearing performance, plugging efficiency and shedding rate.

[0067] Explanation of symbols: filling material 1, wrapping layer 2, rigid temporary blocking ball 3, fixing rod 4, clamping ring 5, whisker 6, clamping ring line 7, cloth tube 8. DETAILED DESCRIPTION

[0068] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0069] Soluble magnesium alloy wires of different wire diameters were purchased from Beijing EasyLink Technology Development Co., Ltd., model 508.

[0070] The fracturing fluid was purchased from Beijing Kemax, model K3.

[0071] The temporary blocking dispenser was purchased from Beijing Komax, model KMM-2.

[0072] The adhesive used in the examples and comparative examples is a commercially available two-component acrylic adhesive (brand number WD1001) produced by Shanghai Kangda New Materials Co., Ltd.

[0073] The elastic temporary blocking balls (brand number 1786-2) used in the comparative example were purchased from Suzhou Guren Nanomaterial Technology Co., Ltd.

[0074] The knot-type temporary plugs used in the comparative examples (the 28 mm model is PGA28, and the 22 mm model is PGA22) were purchased from Shenzhen Phoenix Energy Technology Co., Ltd.

[0075] Unless otherwise specified, the rigid temporary blocking balls of different sizes and materials used in the present invention are all purchased from Tianjin Anxinglida Water Purification Materials Co., Ltd.; the degradable fabrics used in the present invention are all woven fabrics made by weaving technology; and in the embodiments and comparative examples of the present invention, the material used for the fixing rod is consistent with the rigid temporary blocking ball to which it is connected.

[0076] The SAPs of different particle sizes and water absorption multiples used in the examples and comparative examples were purchased from Tianjin Anxing Lida and prepared by injection molding.

[0077] The regular PGA resin raw materials (brand SCP, crystalline, regular cylindrical particles with a particle size of 2-3 mm), PGA fiber cloths of different thicknesses and mesh sizes, PLA fibers of different thicknesses and mesh sizes, and elastic temporary blocking ball (brand 1786-2) cloths used in the embodiments and comparative examples were all purchased from Suzhou Guren Nanomaterial Technology Co., Ltd.

[0078] The irregular amorphous PGA particles used in the present invention are prepared by the following method: regular PGA particles (in a crystalline state) are extruded at 240° C. through a twin-screw granulator (Kunshan Kexin Plastic Machinery Co., Ltd., Model 20) and then directly dropped into liquid nitrogen for rapid cooling to obtain amorphous PGA blocks, and then the amorphous PGA blocks after rapid cooling are taken out and put into a crusher (Ningbo Huayang Plastic Auxiliary Machinery Co., Ltd., Model 400 crusher) for crushing into irregular particles, and finally, finished products with different particle size ranges are sieved according to specific needs.

[0079] The irregular common PGA particles used in the present invention are prepared by the following method: regular PGA particles (in a crystalline state) are extruded at 240° C. by a twin-screw granulator (Kunshan Kexin Plastic Machinery Co., Ltd., Model 20) and then fall into a stainless steel plate. The PGA blocks after natural cooling are put into a crusher (Ningbo Huayang Plastic Auxiliary Machinery Co., Ltd., Model 400 crusher) and crushed into irregular particles. Finally, finished products with different particle size ranges are screened according to specific needs.

[0080] The present invention adopts Figure 6 The device shown is used to evaluate the temporary plugging pressure bearing performance, plugging efficiency and shedding rate, that is, a section of simulated well is placed in a pressure tank with a heating device.

[0081] Temporary blockage pressure test method:

[0082] Use as attached Figure 6 The device shown is used to evaluate the pressure bearing performance of temporary plugging (including temporary plugging ball and knot type temporary plugging). The circular perforation section 60 of the simulated well has 10 circular perforations 61 on both sides of the casing, and the elliptical perforation section 70 has 10 elliptical perforations 71 on both sides of the casing. Open the first vent valve 11 and the second vent valve 21 to vent, and then connect the simulated well to the pump truck ( Figure 6 After the first pump truck interface 10 shown is connected to the pump truck, and the second pump truck interface 20 is used as a venting port and is not connected to any components), a temporary plugging dispenser 80 (produced by Beijing Kemeishi Company, model K3) is loaded with 30 temporary plugs to be tested in the temporary plugging dispenser 80, and the pump truck is turned on to start at 1m 3 / min displacement (maximum pressure 22MPa) is used to pump fracturing fluid into the simulated well, and then the temporary plugging dispenser 80 is turned on to drop the temporary plugging to be tested into the simulated well 30. The pressure in the well is recorded by the first remote pressure gauge 22. If the initial pressure in the simulated well exceeds 20MPa and can be maintained for 1 minute, it indicates that the pressure bearing performance of the temporary plugging is qualified.

[0083] Temporary blockage (including temporary blockage ball and knot type temporary blockage) shedding rate test method:

[0084] After the temporary blocking pressure test is passed, the first pump truck interface 10 is removed, the second pump truck interface 20 is connected to the pump truck, and the first vent valve 11 (originally in the venting state) and the second vent valve 21 are opened, and the pressure is 0.1m 3 / min displacement is pumped into the pressure tank through the second pump truck interface 20. When the fracturing liquid completely overflows the simulated well 30, the pump is stopped, the second vent valve 21 is closed, and the electric heating is turned on (realized by the electric heating rod 40, and the remote temperature measuring probe 50 is used to monitor the temperature). The liquid in the pressure tank is heated at a heating rate of 20℃ / h to simulate the normal heating state of the formation. When the temperature of the fracturing fluid rises to 90℃, the second vent valve 21 is opened and the temperature is 0.1m 3 / min displacement is pumped into the pressure tank again through the second pump truck interface 20, and when the pressure of the second remote pressure gauge 23 reaches 0.3MPa, the pump truck displacement is controlled to be between 0 and 0.3m 3 / min to maintain the pressure in the pressure tank at 0.3±0.01MPa for 5min, then stop the pump, observe and count the number of temporary plugs falling off from the perforation (counted as m). And calculate the shedding rate:

[0085]

[0086] Temporary plugging (including temporary plugging ball and knot type temporary plugging) plugging efficiency test method:

[0087] Use as attached Figure 6The device shown is used to evaluate the plugging efficiency of temporary plugging. The circular perforation section 60 of the simulated well has 10 circular perforations 61 on both sides of the casing (the diameter of the circular perforations 61 is 12 mm), and the elliptical perforation section 70 has 10 elliptical perforations 71 on both sides of the casing (the major axis of the elliptical perforations 71 is 16 mm and the minor axis is 12 mm). After connecting the simulated well to the pump truck and the temporary plugging dispenser 80 (produced by Beijing Kemax Company, model K3), 20 temporary plugs of the same type that have passed the pressure test are placed in the temporary plugging dispenser 80, and the pump truck is turned on to start pumping at 1m 3 / min displacement (maximum pressure 22MPa) is used to pump fracturing fluid into the simulated well, and then the temporary plugging injector 80 is turned on to inject the temporary plugging to be tested into the simulated well. After the temporary plugging is injected for 1 minute, the plugging conditions of all perforations are observed through the manhole and the camera 91 (installed in the pressure tank shell 90), and the number of plugged perforations (counted as n) is counted.

[0088] Calculate the plugging efficiency:

[0089] Temporary blockage (including temporary blockage ball and knot type temporary blockage) degradation rate test:

[0090] Take a temporary blockage to be tested and weigh it (weight is m1), put it into a 250ml high-pressure hydrothermal kettle, add 150g of water, and seal the hydrothermal kettle. Then put the entire hydrothermal kettle in a 120℃ oven and heat it for 48h, then take out the hydrothermal kettle, cool it down, pour the contents into a 20-mesh screen, take the components that have not passed through the screen and put them in a 105℃ oven to dry for 12h and weigh them, the weight is m2, and calculate the degradation rate according to the following formula:

[0091]

[0092] Example 1

[0093] This embodiment provides an adaptive bionic temporary blockage. Figure 1 It is a schematic diagram of the structure of adaptive bionic temporary blocking. Figure 1 As shown, the adaptive bionic temporary plugging includes: a wrapping layer 2, a filling material 1, a rigid temporary plugging ball 3, a fixing rod 4 and a clamping ring 5.

[0094] The wrapping layer 2 is composed of a head and a whisker 6. The head of the wrapping layer 2 is a hollow cylinder, and the whisker 6 is composed of a plurality of strips. The wrapping layer 2 is formed by sewing and cutting a cloth tube 8.

[0095] The rigid temporary blocking ball 3 is located inside the head of the wrapping layer 2 .

[0096] The filling material 1 is located inside the head and filled between the rigid temporary plugging ball 3 and the head. The composition of the filling material 1 is: 3g of SAP with a water absorption multiple of 50 times and a particle size of 60-70 mesh, and 60g of amorphous irregular PGA particles with a particle size of 6-10 mesh. SAP and PGA are evenly and alternately distributed.

[0097] One end of the fixing rod 4 is connected to the rigid temporary blocking ball 3 and is located inside the head together with the rigid temporary blocking ball 3 ; the other end of the fixing rod is located outside the rigid temporary blocking ball 3 , passes through and is fixed to the clamping ring 5 .

[0098] The clamping ring 5 is located at the junction of the head and the whisker of the wrapping layer 2, and the junction is marked as a clamping ring line 7. In this embodiment, the clamping ring 5 is a soluble magnesium alloy clamping ring.

[0099] Figure 3 A schematic diagram of the structural dimensions of a cloth tube forming a wrapping layer; Figure 5 It is a schematic diagram of the structural dimensions of the rigid temporary blocking ball and the fixed rod. Figure 3 , Figure 5 The meanings of the size symbols are as follows: K1: the cylindrical diameter of the head; K2: the cylindrical diameter of the whisker; L1: the length of the head; L2: the length of the whisker; L3: the total length of the head and whisker; D0: the ball diameter of the rigid temporary plugging ball; D1: the length of the fixing rod outside the rigid temporary plugging ball, that is, the effective length of the fixing rod; D: the length of the fixing rod inside the rigid temporary plugging ball, that is, the depth of the hole of the rigid temporary plugging ball; D3: the length of the fixing rod passing through the clamping ring, that is, the distance between the end of the fixing rod that is not connected to the rigid temporary plugging ball and the clamping ring; D4: the diameter of the fixing rod. D, D0, D1, D3, and D4 are the corresponding dimensions of the rigid temporary plugging ball after being assembled with the fixing rod.

[0100] The above-mentioned bionic temporary plugging preparation method comprises:

[0101] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0 = 20mm, material PGA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4 = 2mm) into the hole, and cut off the excess part of the fixing rod to achieve the designed size (fixing rod effective length D1 = 20mm).

[0102] 2. Use biodegradable cloth (made of PGA, 0.1mm thick, 100 mesh) to cut into cloth tubes of designed size, and mark the clamping ring line according to the preset head length (K1=K2=40mm; L3 is 120mm; L1=60mm).

[0103] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption ratio of 50 times and a particle size of 60-70 mesh, and 60g of amorphous irregular PGA particles with a particle size of 6-10 mesh) and a rigid temporary blocking ball equipped with a fixed rod into the cloth tube in sequence.

[0104] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm. Figure 2 The installation and tightening process of the soluble magnesium alloy retaining ring is shown in the figure. Figure 4 This diagram illustrates the process of using a cloth tube to form a wrapping layer.

[0105] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 60 mm, so as to obtain an adaptive bionic temporary blockage.

[0106] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists in detail the size specifications of each part of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0107] Example 2

[0108] This embodiment provides an adaptive bionic temporary blockage, whose appearance and structure are similar to those of the adaptive bionic temporary blockage in Embodiment 1, except that the structural dimensions of some parts are different.

[0109] The preparation method of the adaptive bionic temporary blockage comprises:

[0110] 1. Make a hole with a diameter of 1.5 mm and a depth of 3 mm on the rigid temporary blocking ball (diameter D0 = 22 mm, material PGA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4 = 1.5 mm), and cut off the excess part of the fixing rod to achieve the designed size (D1 = 33 mm).

[0111] 2. Use biodegradable cloth (made of PGA, 0.1mm thick, 120 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=66mm; L3 is 198mm; L1=77mm).

[0112] 3. Put the pre-mixed filling materials (4g of SAP with a water absorption ratio of 80 times and a particle size of 70-80 mesh, and 50g of amorphous irregular PGA particles with a particle size of 10-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0113] 4. Use a soluble magnesium alloy clamp (wire diameter is 4mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0114] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 5 mm as the whisker, and trim it appropriately to control the length of the strip to 66 mm, so as to obtain an adaptive bionic temporary blockage.

[0115] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0116] Example 3

[0117] This embodiment provides an adaptive bionic temporary occlusion, whose appearance and structure are similar to those of the adaptive bionic temporary occlusion in Embodiment 1, except that the sizes of some structures are different.

[0118] The preparation method of the adaptive bionic temporary blockage comprises:

[0119] 1. Make a hole with a diameter of 2.5mm and a depth of 3mm on the rigid temporary blocking ball (diameter D0=26mm, material PGA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2.5mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=33mm).

[0120] 2. Use biodegradable cloth (made of PGA, 0.2mm thick, 100 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=52mm; L3 is 156mm; L1=85mm).

[0121] 3. Put the pre-mixed filling materials (SAP with a water absorption ratio of 100 times and a particle size of 60-70 mesh in an amount of 2g, and amorphous irregular PGA particles with a particle size of 6-40 mesh in an amount of 60g) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0122] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0123] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 10 mm, and trim it appropriately to control the length of the strip to 52 mm, so as to obtain an adaptive bionic temporary blockage.

[0124] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0125] Example 4

[0126] This embodiment provides an adaptive bionic temporary occlusion, whose appearance and structure are similar to those of the adaptive bionic temporary occlusion in Embodiment 1, except that the sizes of some structures are different.

[0127] The preparation method of the adaptive bionic temporary blockage comprises:

[0128] 1. Make a hole with a diameter of 2mm and a depth of 3mm on the rigid temporary blocking ball (diameter D0=19mm, material is PGA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=38mm).

[0129] 2. Use biodegradable cloth (made of PGA, 0.2mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=76mm).

[0130] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption ratio of 80 times and a particle size of 70-80 mesh, and 30g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0131] 4. Use a soluble magnesium alloy clamp (wire diameter is 2mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0132] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm, so as to obtain an adaptive bionic temporary blockage.

[0133] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0134] Example 5

[0135] This embodiment provides an adaptive bionic temporary occlusion, whose appearance and structure are similar to those of the adaptive bionic temporary occlusion in Embodiment 1, except that the sizes of some structures are different.

[0136] The preparation method of the adaptive bionic temporary blockage comprises:

[0137] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0138] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0139] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption ratio of 80 times and a particle size of 70-80 mesh, and 40g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0140] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0141] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm, so as to obtain an adaptive bionic temporary blockage.

[0142] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0143] Example 6

[0144] This embodiment provides an adaptive bionic temporary occlusion, whose appearance and structure are similar to those of the adaptive bionic temporary occlusion in Embodiment 1, except that the sizes of some structures are different.

[0145] The preparation method of the adaptive bionic temporary blockage comprises:

[0146] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=19mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0147] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 100 mesh) and cut it into a cloth tube of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head and beard lengths (K1=50mm; L3 is 150mm; L1=68mm).

[0148] 3. Put the pre-mixed filling materials (3.5g of SAP with a water absorption ratio of 80 times and a particle size of 60-80 mesh, and 55g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0149] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0150] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 38 mm, so as to obtain an adaptive bionic temporary blockage.

[0151] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0152] Example 7

[0153] This embodiment provides an adaptive bionic temporary occlusion, whose appearance and structure are similar to those of the adaptive bionic temporary occlusion in Embodiment 1, except that the sizes of some structures are different.

[0154] The preparation method of the adaptive bionic temporary blockage comprises:

[0155] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0156] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 100 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0157] 3. Put the pre-mixed filling materials (4g of SAP with a water absorption ratio of 80 times and a particle size of 70-80 mesh, and 50g of amorphous irregular PGA particles with a particle size of 10-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0158] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0159] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 66 mm, so as to obtain an adaptive bionic temporary blockage.

[0160] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0161] Example 8

[0162] This embodiment provides an adaptive bionic temporary occlusion, whose appearance and structure are similar to those of the adaptive bionic temporary occlusion in Embodiment 1, except that the sizes of some structures are different.

[0163] The preparation method of the adaptive bionic temporary blockage comprises:

[0164] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0165] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 200 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=76mm).

[0166] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption ratio of 80 times and a particle size of 70-80 mesh, and 40g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0167] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0168] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm, so as to obtain an adaptive bionic temporary blockage.

[0169] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0170] Example 9

[0171] This embodiment provides an adaptive bionic temporary plugging, whose appearance and structure are similar to those of the adaptive bionic temporary plugging of embodiment 5, except that the SAP particle size of the filling material is different.

[0172] The preparation method of the adaptive bionic temporary blockage comprises:

[0173] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0174] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0175] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption multiple of 80 times and a particle size of 80-100 mesh, and 40g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0176] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0177] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm, so as to obtain an adaptive bionic temporary blockage.

[0178] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0179] Example 10

[0180] This embodiment provides an adaptive bionic temporary blocking device, whose appearance and structure are similar to those of the adaptive bionic temporary blocking device in Embodiment 1, except that the material of the rigid temporary blocking ball is different.

[0181] The preparation method of the adaptive bionic temporary blockage comprises:

[0182] 1. Make a hole with a diameter of 2 mm and a depth of 3 mm on a rigid temporary plugging ball (diameter D0 = 22 mm, made of PLA / PGA blended in a mass ratio of 7 / 3), apply a small amount of adhesive in the hole, insert a fixing rod (fixing rod diameter D4 = 2 mm), and cut off the excess part of the fixing rod to achieve the designed size (D1 = 30 mm).

[0183] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0184] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption ratio of 80 times and a particle size of 70-80 mesh, and 40g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0185] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0186] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm, so as to obtain an adaptive bionic temporary blockage.

[0187] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0188] Embodiment 11

[0189] This embodiment provides an adaptive bionic temporary plugging, whose appearance and structure are similar to those of the adaptive bionic temporary plugging in Embodiment 1, except that the water absorption multiples of the SAP used are different.

[0190] The preparation method of the adaptive bionic temporary blockage comprises:

[0191] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0192] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0193] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption ratio of 200 times and a particle size of 70-80 mesh, and 40g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0194] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0195] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp ring evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm, so as to obtain an adaptive bionic temporary blockage.

[0196] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 1 lists the key size specifications of the temporary plug, and Table 2 lists the test results of the temporary plug.

[0197] Comparative Example 1: A series of performance evaluations were directly conducted using the same rigid temporary blocking ball (diameter D0=22 mm, made of PLA) as in Example 5. Table 2 lists the test results of the temporary blocking ball.

[0198] Comparative Example 2: A series of performance evaluations were directly conducted using a knot-type temporary plugging ball with a diameter of 28 mm. Table 2 lists the test results of the temporary plugging ball.

[0199] Comparative Example 3: A series of performance evaluations were directly conducted using a knot-type temporary plugging ball with a diameter of 22 mm. Table 2 lists the test results of the temporary plugging ball.

[0200] Comparative Example 4: A series of performance evaluations were directly conducted using an elastic temporary blocking ball (produced by Suzhou GuRen Nanomaterial Technology Co., Ltd., model 1786-2). Table 2 lists the test results of the temporary blocking ball.

[0201] Comparative Example 5: This comparative example provides a temporary plugging, whose appearance and structure are similar to the adaptive bionic temporary plugging of Example 5, except that the filling material does not contain SAP.

[0202] The preparation method of the temporary plugging comprises:

[0203] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0204] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0205] 3. Place amorphous irregular PGA particles with a particle size of 6-40 mesh (40g in total) and a rigid temporary blocking ball equipped with a fixed rod in the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and fill the filling material between the rigid temporary blocking ball and the cloth tube.

[0206] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0207] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm to achieve temporary blockage.

[0208] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0209] Comparative Example 6

[0210] This comparative example provides a temporary plugging, whose appearance and structure are similar to those of the adaptive bionic temporary plugging of Example 5, except that the type of PGA filled with the material is different.

[0211] The preparation method of the temporary plugging comprises:

[0212] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0213] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0214] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption multiple of 80 times and a particle size of 70-80 mesh, and 40g of cylindrical regular crystalline PGA particles) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0215] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0216] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm to achieve temporary blockage.

[0217] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0218] Comparative Example 7

[0219] This comparative example provides a temporary plugging, whose appearance and structure are similar to those of the adaptive bionic temporary plugging of Example 5, except that no fixed rod is provided in the temporary plugging of this comparative example.

[0220] The preparation method of the temporary plugging comprises:

[0221] 1. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into a cloth tube of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0222] 2. Put the pre-mixed filling materials (3g of SAP with a water absorption multiple of 80 times and a particle size of 70-80 mesh, and 40g of amorphous irregular PGA particles with a particle size of 6-40 mesh) and rigid temporary blocking balls (diameter D0=22mm, made of PLA) into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0223] 3. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 Tighten the clamping ring line (as shown) to wrap the filling material and the rigid temporary plugging ball in the cloth tube.

[0224] 4. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm to achieve temporary blockage.

[0225] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0226] Comparative Example 8

[0227] This comparative example provides a temporary plugging, whose appearance and structure are similar to those of the adaptive bionic temporary plugging in Example 5, except that the particle size of the SAP of the filling material is different.

[0228] The preparation method of the temporary plugging comprises:

[0229] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0230] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0231] 3. Put the pre-mixed filling materials (SAP with a water absorption ratio of 80 times and a particle size of 10-20 mesh in an amount of 3g, and amorphous irregular PGA particles with a particle size of 6-40 mesh in an amount of 40g) and a rigid temporary blocking ball equipped with a fixed rod into the cloth tube in sequence.

[0232] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0233] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm to achieve temporary blockage.

[0234] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0235] Comparative Example 9

[0236] This comparative example provides a temporary plugging, whose appearance and structure are similar to those of the adaptive bionic temporary plugging in Example 5, except that the particle size of the PGA particles in the filling material is different.

[0237] The preparation method of the temporary plugging comprises:

[0238] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0239] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0240] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption multiple of 80 times and a particle size of 70-80 mesh, and 40g of amorphous irregular PGA particles with a particle size of 40-80 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0241] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0242] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm to achieve temporary blockage.

[0243] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0244] Comparative Example 10

[0245] This comparative example provides a temporary plugging, whose appearance and structure are similar to the adaptive bionic temporary plugging of Example 5, except that in this comparative example, the irregular amorphous PGA particles are replaced by irregular crystalline PGA particles.

[0246] The preparation method of the temporary plugging comprises:

[0247] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0248] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0249] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption multiple of 80 times and a particle size of 70-80 mesh, and 40g of crystalline irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0250] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0251] 5. Cut the part of the cloth tube that passes through the magnesium alloy clamp evenly to form a strip with a width of 6 mm, and trim it appropriately to control the length of the strip to 50 mm to achieve temporary blockage.

[0252] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0253] Comparative Example 11

[0254] This comparative example provides a temporary plug, whose appearance and structure are similar to those of the adaptive bionic temporary plug in Example 5, except that the wrapping layer in this comparative example is not provided with whiskers.

[0255] The preparation method of the temporary plugging comprises:

[0256] 1. Make a hole with a diameter of 2mm and a depth of 3mm on a rigid temporary plugging ball (diameter D0=22mm, made of PLA), apply a small amount of adhesive in the hole, insert the fixing rod (fixing rod diameter D4=2mm), and cut off the excess part of the fixing rod to achieve the designed size (D1=30mm).

[0257] 2. Use biodegradable cloth (made of PLA, 0.15mm thick, 110 mesh) to cut into cloth tubes of designed size, with one end of the cloth tube closed and the other end open; and mark the clamping ring line according to the preset head length (K1=50mm; L3 is 150mm; L1=74mm).

[0258] 3. Put the pre-mixed filling materials (3g of SAP with a water absorption multiple of 80 times and a particle size of 70-80 mesh, and 40g of crystalline irregular PGA particles with a particle size of 6-40 mesh) and a rigid temporary blocking ball with a fixed rod into the cloth tube in sequence, and make the rigid temporary blocking ball located in the middle of the cloth tube, and the filling material filled between the rigid temporary blocking ball and the cloth tube.

[0259] 4. Use a soluble magnesium alloy clamp (wire diameter is 3mm) to clamp the cloth tube along the designed clamp line (such as Figure 3 The clamping ring line shown in the figure is tightened and clamped together with the fixing rod of the rigid temporary blocking ball, and the length of the fixing rod passing through the clamping ring (D3) is controlled to be 2mm.

[0260] 5. Remove all the parts of the cloth tube that pass through the magnesium alloy retaining ring to obtain temporary blockage.

[0261] A series of performance evaluations were conducted on the temporary plug prepared by this method. Table 2 lists the test results of the temporary plug.

[0262] Table 1

[0263]

[0264] Table 2

[0265]

[0266]

[0267] Note: “ / ” indicates that no test was conducted or no data is available; a high drop-off rate indicates that the temporary plugging was not effectively fixed on the perforation and could not effectively save the temporary plugging or bridge plug.

[0268] From the data in Table 2, we can see that:

[0269] 1. Comparative Example 1 uses a single rigid temporary plugging ball as temporary plugging, and its pressure bearing performance does not meet the requirements, and the on-site starting pressure is 5MPa; Comparative Example 4 uses a single elastic temporary plugging ball as temporary plugging. Although the pressure bearing performance meets the requirements, the falling rate is as high as 90%, and the plugging rate is only 60%.

[0270] Comparative Examples 2 and 3 respectively use knot-type temporary plugging with different diameters for plugging. The results show that the pressure bearing capacity of the knot-type temporary plugging (diameter 22mm) of Comparative Example 3 does not meet the requirements, the starting pressure is 5MPa, and the knot fails due to deformation through the perforation; although the pressure bearing capacity of the knot-type temporary plugging (diameter 28mm) of Comparative Example 2 meets the requirements, the shedding rate is as high as 90%, and the plugging efficiency is only 70%.

[0271] The above results show that temporary plugging balls and knot-type temporary plugging alone cannot meet the plugging requirements. Even if they can be used for plugging, the plugging efficiency is low. The bionic temporary plugging pressure-bearing performance prepared by the embodiments of the present invention meets the requirements, the shedding rate is significantly reduced and controlled within 5%, the plugging efficiency reaches more than 85%, and the degradation rate can reach 99%.

[0272] 2. The temporary plugging filling material of Comparative Example 5 does not contain SAP particles. Comparing Comparative Example 5 with Example 5, it can be seen that by adding SAP particles to the filling material, the shedding rate can be reduced, temporary plugging shedding can be avoided, and the plugging rate can be effectively improved.

[0273] 3. The irregular PGA particles used for temporary plugging in Comparative Examples 6 and 10 are crystalline particles. Comparing Comparative Examples 6 and 10 with Example 5, it can be seen that by adding amorphous irregular PGA particles to the filling material, the characteristics of low glass transition temperature and fast crystallization speed of PGA can be utilized to crystallize in the perforation to form a short-term high-temperature resistant hard block, thereby improving the pressure bearing capacity and plugging capacity of the temporary plugging.

[0274] 4. No fixing rod for connecting the rigid temporary plugging ball is provided in the temporary plugging of Comparative Example 7. Comparing Comparative Example 7 with Example 5, it can be seen that the falling rate of the temporary plugging can be reduced by providing the fixing rod.

[0275] 5. The particle size of the SAP particles in the temporary plugging of Comparative Example 8 is larger than that of the SAP particles in Example 5. It can be seen from the comparison of the test results that by controlling the particle size of the SAP particles, the volume of the coating layer after the SAP particles absorb water can be adjusted, thereby adjusting the suspension performance of the temporary plugging and reducing the shedding rate of the temporary plugging.

[0276] 6. The particle size of the amorphous PGA particles used for temporary plugging in comparative example 9 is different from that of the amorphous PGA particles used in example 5. Comparison of the test results of the two shows that the pressure bearing capacity and plugging capacity of temporary plugging can be significantly improved by controlling the particle size of the amorphous PGA particles.

[0277] 7. The temporary plugging wrapping layer of comparative example 11 does not contain whiskers but only has a head. Comparing comparative example 11 with embodiment 5, it can be seen that by providing whiskers in the temporary plugging, the suspension ability of the temporary plugging in the well can be improved, thereby improving the plugging ability.

[0278] The above results indicate that the bionic temporary plugging provided by the present invention is adaptive, can be effectively fixed to the perforation, has high pressure bearing capacity and plugging capacity, and can effectively save temporary plugging or bridge plugging.

Claims

1. A bionic temporary plugging device, which comprises a wrapping layer, a filling material, a rigid temporary plugging ball, a fixing rod and a clamping ring; in, The wrapping layer includes a head and a whisker, the head is a hollow structure, the whisker is composed of a plurality of strips, and the head and the whisker are separated by a clamp ring; The rigid temporary blocking ball is located inside the head of the wrapping layer; The filling material includes highly absorbent polyacrylamide and irregular rigid particles, and the highly absorbent polyacrylamide and the irregular rigid particles are alternately distributed inside the head of the wrapping layer; One end of the fixing rod is connected to a rigid temporary blocking ball, and the other end passes through a clamping ring and is fixed by the clamping ring.

2. The bionic temporary blockage according to claim 1, wherein: The diameter of the rigid temporary blocking ball is 19mm-26mm; Preferably, the material of the rigid temporary blocking ball includes polylactic acid and / or polyglycolide.

3. The bionic temporary blockage according to claim 1, wherein: The head of the wrapping layer is a hollow cylinder, the diameter of the cylinder is 2-3 times the diameter of the rigid temporary plugging ball, and the total length of the head and the whisker is 2-3 times the diameter of the cylinder.

4. The bionic temporary blockage according to claim 1, wherein: The material of the wrapping layer is a flexible material, preferably a degradable cloth, and the material of the degradable cloth preferably includes polylactic acid or polyglycolide; Preferably, the thickness of the wrapping layer is 0.1 mm-0.2 mm; Preferably, the mesh size of the wrapping layer is 100-200 mesh, more preferably 100-120 mesh.

5. The bionic temporary blockage according to claim 1, wherein: The length of the whiskers of the wrapping layer is 2-3 times the diameter of the rigid temporary plugging ball; Preferably, the width of the strips in the whisker portion of the wrapping layer is 5-10 mm.

6. The bionic temporary blockage according to claim 1, wherein: The water absorption multiple of the highly absorbent polyacrylamide is 50-200 times, preferably 50-100 times; preferably, the particle size of the highly absorbent polyacrylamide is 60-100 mesh, preferably 60-80 mesh; And / or, the material of the irregular rigid particles includes amorphous polyglycolide; preferably, the particle size of the irregular rigid particles is 6-40 mesh.

7. The bionic temporary blockage according to claim 6, wherein: The amount of the highly absorbent polyacrylamide is 2-4 g; The dosage of the irregular rigid particles is 30-60g.

8. The bionic temporary blockage according to claim 1, wherein: The length of the fixing rod outside the rigid temporary blocking ball is 1-2 times the diameter of the rigid temporary blocking ball.

9. The method for preparing a bionic temporary plug according to any one of claims 1 to 8, wherein: The preparation method comprises: Step 1, drilling a hole on the surface of the rigid temporary plugging ball, inserting one end of the fixing rod into the hole to connect with the rigid temporary plugging ball; Step 2, using the raw material of the wrapping layer to form a hollow structure with one end closed and the other end open, and marking the clamping ring line according to the length of the designed head; Step 3, filling material and rigid temporary plugging balls are placed inside the closed end of the wrapping layer to form a head; the end of the fixing rod that is not located at the rigid temporary plugging balls is located in the middle of the open end of the wrapping layer; Step 4, fixing the clamp ring to the clamp ring line, and passing the fixing rod through the clamp ring to obtain the bionic temporary blockage; Step 2 or step 4 includes: cutting the raw material of the wrapping layer into a plurality of strips along the opening end to the clamping ring line to form whiskers.

10. A temporary plugging process, which is carried out using the bionic temporary plugging according to any one of claims 1 to 8.

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