Filling tool for underground mining of petroleum vertical well

Abstract

The invention belongs to the technical field of oil well sand prevention, and provides a filling tool for underground mining of a petroleum vertical well, which comprises a drainage inner pipe, a connecting end is mounted at the bottom of the drainage inner pipe in a threaded manner, an inner screen pipe is mounted at one end of the connecting end in a threaded manner, and a plurality of inner screen holes are formed in the side surface of the inner screen pipe. The intercepting assembly is arranged, the hole diameter of the intercepting assembly is smaller than the hole diameter of the outer screen hole, and the hole diameter of the outer screen hole is smaller than the hole diameter of the screen pipe, so that the outer screen pipe and the intercepting assembly can intercept most small-particle gravel, and loss of the small-particle gravel is prevented; by means of the sand burning glue, small-particle gravel blocked in the intercepting assembly and the outer screen pipe can be conveyed back into gravel layers, gaps between the gravel layers can be filled, the gravel layers can be combined more tightly and stably, the gravel can be mutually bonded through the sand burning glue, the gravel is prevented from being disengaged from the screen pipe, and therefore petroleum pollution is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well sand prevention, and in particular relates to a filling tool used for underground mining of a vertical oil well. Background Art

[0002] During oil extraction, due to the different structures of the strata, oil wells will experience varying degrees of sand production. Sand production will lead to a decline in the quality of oil in the oil wells, and in severe cases, it will cause the oil wells to stop production or be scrapped. In order to address the serious problem of sand production, filling and sand prevention technology is being used more and more.

[0003] Gravel packing sand control technology is the most effective sand control method widely used at home and abroad, and is also the most widely used technology in oil fields. It can meet the requirements of early and mid-to-late sand control for vertical wells, inclined wells, and horizontal wells. Gravel packing technology usually fixes the completion string with a screen in the wellbore, and then uses a packing tool to transport sand-carrying fluid to the annular space between the screen and the wellbore, filters out the gravel and leaves it outside the screen to form a packing layer, and the remaining filtered liquid returns to the wellhead through the channel in the packing tool.

[0004] In the prior art, in order to prevent the screen from being blocked, the aperture of the screen is usually increased to block large particles of gravel. However, some small particles of gravel will be discharged through the screen and the filling tool, which will not only easily cause the filling tool to be blocked, but also cause part of the gravel to be lost, resulting in a decrease in filling efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a filling tool for underground mining of vertical petroleum wells, aiming to solve the technical problems of small-grain gravel loss and easy blockage of the filling tool in the prior art.

[0006] The present invention is implemented as follows: a filling tool for underground mining of a vertical petroleum well comprises an inner drainage pipe, a connector connected to an external drainage pipe is arranged on the top of the inner drainage pipe, a connecting end is threadedly installed on the bottom of the inner drainage pipe, an inner screen pipe is threadedly installed on one end of the connecting end, a plurality of inner screen holes are provided on the side of the inner screen pipe, a threaded plug is threadedly installed on the bottom end of the inner screen pipe, a mounting end is sleeved on the bottom of the inner screen pipe, the thread plug abuts against the mounting end, an outer screen pipe is installed on the mounting end, the outer diameter of the outer screen pipe is slightly smaller than the inner diameter of the screen pipe, one end of the outer screen pipe is installed on the connecting end, and the side of the outer screen pipe is opened. A plurality of outer sieve holes are provided, the aperture of the outer sieve holes is smaller than the aperture of the sieve tube, the axis of the outer sieve tube coincides with the axis of the inner sieve tube, a feeding outer pipe is installed on the outer side of the drainage inner pipe, the top of the feeding outer pipe is externally connected to the feeding pipe, the bottom of the feeding outer pipe extends to the outside of the end of the outer sieve tube, the feeding outer pipe is used to transport the sand-carrying liquid to the outside of the outer sieve tube, and make the sand and gravel fill the space between the vertical wellbore and the sieve tube, the sand-carrying liquid is a liquid containing sand and gravel, the sand and gravel in the sand-carrying liquid will be blocked by the sieve tube, and the liquid will enter the interior of the inner sieve tube through the sieve tube, the outer sieve holes and the inner sieve holes, and be discharged through the drainage inner pipe, so that an annular sand and gravel layer is formed in the wellbore; An interception component is sleeved on the outer side of the inner screen tube, and the interception component is located between the outer screen tube and the inner screen tube. The two ends of the interception component are respectively abutted against the sides of the connecting end and the mounting end. The interception component is used to intercept small particles of gravel to avoid the loss of small particles of gravel and the resulting reduction in filling efficiency.

[0007] Further technical solution: the outer discharge pipe includes an outer sleeve fixedly installed on the outside of the drainage inner pipe, an external connector is provided on the top of the outer discharge pipe, the external connector is used to connect with the feeding pipe, and a flow guide cover is provided on the bottom of the outer sleeve. The flow guide cover is in a trumpet shape, one end of the flow guide cover extends to the outside of the end of the outer screen tube, the inner diameter of the flow guide cover is larger than the outer diameter of the screen tube, and a plurality of guide grooves are opened inside the outer sleeve, and all of the guide grooves are connected to the external connector and the flow guide cover.

[0008] Further technical solution: the interception assembly includes an upper end and a lower end, the upper end and the lower end are connected by a plurality of tie rods, the sides of the upper end and the lower end are provided with a sink groove adapted to the tie rods, the top of the upper end is in contact with the connecting end, the bottom of the lower end is in contact with the mounting end, a plurality of guide rings are passed through and slidably mounted on the tie rod, the guide rings are provided with positioning holes adapted to the tie rods, both sides of each guide ring are fixedly connected with a limiting hemisphere, when the guide ring is installed, two adjacent limiting hemispheres are in contact, so that a gap is left between the two adjacent guide rings; In order to further reduce the amount of small-grained gravel loss, the cross-section of the guide ring is a stepped shape with an inclined surface, so that the cross-section of the gap formed between two adjacent guide rings is inclined, extending the liquid flow path. At the same time, since the vertical distance between the two inclined planes is smaller than the vertical distance between them, small-grained gravel is more easily blocked by the edge of the guide ring. Since the gap width between the two guide rings is smaller than the diameter of the outer sieve hole, the loss of small-grained gravel is avoided, thereby improving the filling efficiency.

[0009] Further technical solution: the diameter of the positioning hole is larger than the diameter of the pull rod, and the distance between the limiting hemispheres on the opposite sides of the two guide rings at the two ends is smaller than the distance between the facing sides of the upper end and the lower end, so as to leave space for the movement of the guide ring, so that the guide ring can be tilted relative to the horizontal plane of the pull rod, thereby increasing the distance between two adjacent guide rings, making it easier for the gravel blocked between the guide rings to fall out, thereby avoiding blockage of the interception component.

[0010] Further technical solution: a glue lowering assembly is also installed inside the inner drainage pipe, a first glue delivery cavity can be formed between the lower glue assembly and the inner drainage pipe, a second glue delivery cavity can be formed between the lower glue assembly and the inner screen pipe, one end of the first glue delivery cavity is connected with the interior of the inner drainage pipe, and one end of the second glue delivery cavity is connected with the inner sieve hole, the sand glue delivered from the inner drainage pipe will be delivered from the first glue delivery cavity to the second glue delivery cavity, and discharged to the gravel layer through the inner sieve hole, the interception assembly, the outer sieve hole and the sieve pipe, which can greatly reduce residual sand glue and save the use of sand glue.

[0011] Further technical solution: the glue lowering assembly comprises a sealed inner tube fixedly connected to the inside of the drainage inner tube, a sealed annular first glue delivery cavity is formed between the sealed inner tube and the drainage inner tube, an annular second glue delivery cavity can be formed between the sealed inner tube and the inner screen tube, the cross section of the first glue delivery cavity is an inverted trapezoid, the top of the sealed inner tube is funnel-shaped, an upper blocking ball is arranged on the top of the sealed inner tube, the diameter of the upper blocking ball is larger than the minimum inner diameter of the sealed inner tube and smaller than the inner diameter of the drainage inner tube, initially, the upper blocking ball blocks the sealed inner tube, a glue inlet hole connected to the drainage inner tube is opened on the top of the sealed inner tube, and the glue inlet hole is located outside the contact position between the upper blocking ball and the sealed inner tube; A sealing sleeve is slidably connected to the interior of the first glue delivery cavity, and a glue hole for the sand glue to pass through is opened on the sealing sleeve. One end of the sealing sleeve passes through the sealing inner tube and extends to the interior of the inner screen tube. The outer diameter of the sealing sleeve is smaller than the inner diameter of the inner screen tube. A sealing platform matched with the sealing sleeve is installed at the inner bottom end of the inner screen tube, and the sealing platform is located below the inner screen hole; In order to allow the sand-bonding adhesive in the first adhesive delivery cavity to flow into the second adhesive delivery cavity, a plurality of adhesive outlet holes communicating with the second adhesive delivery cavity are provided at the bottom of the sealing inner tube; In order not to affect the discharge of liquid and to make the second glue delivery chamber sealed, thereby preventing the sand glue from flowing into the inner screen tube, an electric motor is installed in the first glue delivery chamber, the output shaft of the motor is fixedly connected to a screw, the screw and the sealing sleeve are threadedly connected, a protective cover is provided on the outer side of the motor, and a telescopic protective cover (not shown) is sleeved on the outer side of the screw, so as to prevent the sand glue from causing adverse effects on the motor and the screw.

[0012] Further technical solution: A hole-blocking rod is fixedly connected to the side of the sealing sleeve close to the glue inlet hole, and one end of the hole-blocking rod can be inserted into the glue inlet hole to block the glue inlet hole.

[0013] Further technical solution: a water drainage mechanism is installed inside the inner screen tube, and the water drainage mechanism is installed on the plugging platform. When the sealing sleeve is lowered onto the plugging platform, the water drainage mechanism is used to discharge the liquid in the second glue delivery cavity into the inside of the plug; In order to prevent the inside of the plug from being filled with liquid and causing the liquid in the second glue delivery cavity to be unable to be discharged, a funnel-shaped through hole is opened on the top of the plugging platform, and a lower blocking ball is arranged in the through hole. The lower blocking ball blocks the through hole, so that the liquid in the inner screen tube cannot enter the plug; In order to prevent liquid from accumulating inside the plug, a drainage hole connected to the outside is opened on the side of the plug, and the liquid entering the plug will be discharged to the outside through the drainage hole.

[0014] Further technical solution: the drainage mechanism includes a drainage groove provided on the sealing platform, the drainage groove is an annular groove, the inner diameter of the drainage groove is the same as the inner diameter of the sealing sleeve, the outer diameter of the drainage groove is larger than the outer diameter of the sealing sleeve, and the drainage mechanism also includes a plurality of drainage components; The water drainage component includes a water passage chamber provided inside the plugging platform, two first water drainage holes are provided on the plugging platform, the water passage chamber is communicated with the water drainage groove through the two first water drainage holes, a second water drainage hole is provided on the plugging platform, the water passage chamber is communicated with the screw plug through the second water drainage hole, a mounting plate is slidably connected inside the water passage chamber, a compression spring is connected between the mounting plate and the side of the water passage chamber close to the screw plug, a plugging cone and an extrusion cone are fixedly connected to the side of the mounting plate close to the sealing sleeve, the plugging cone and the extrusion cone can be respectively inserted into the two first water drainage holes and block the first water drainage holes, the extrusion cone is located directly below the sealing sleeve, the plugging cone is located outside the sealing sleeve, and the height of the plugging cone is less than the height of the extrusion cone; In order to prevent the sand adhesive from leaking from the first drainage hole, the height of the extrusion cone is smaller than the depth of the drainage trough; In order to prevent the large liquid pressure from forcing the extrusion cone and the blocking cone to descend, the top end of the extrusion cone and the blocking cone are set to be conical. The cone can reduce the downward pressure from the liquid and prevent the liquid from leaking prematurely.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides an interception assembly, and makes the aperture of the interception assembly smaller than the aperture of the outer sieve hole, and the aperture of the outer sieve hole smaller than the aperture of the screen tube, so that the outer screen tube and the interception assembly can intercept most of the small grains of gravel to prevent the loss of small grains of gravel. At the same time, by conveying the adhesive sand glue to the gravel layer, the small grains of gravel blocked in the interception assembly and the outer screen tube can be conveyed back to the gravel layer, and the gaps between the gravel layers can be filled, so that the gravel layers are more tightly combined and more stable. The adhesive sand glue can also make the gravel adhere to each other, so as to prevent the gravel from escaping from the screen tube, thereby avoiding the pollution of oil. 2. The present invention sets the cross section of the guide ring to a stepped shape with an inclined surface, so that small particles of gravel are more easily blocked by the edge of the guide ring. Since the guide ring is annular, when the gravel is blocked on a certain outer side of the guide ring, the liquid can still pass through the edge of the gravel, effectively reducing the probability of the interception component being blocked. By making the diameter of the positioning hole larger than the diameter of the pull rod, the guide ring can be tilted relative to the horizontal plane of the pull rod, thereby increasing the distance between two adjacent guide rings, making it easier for the gravel blocked between the guide rings to escape, thereby avoiding the blockage of the interception component and allowing the filling tool to be used continuously. 3. The present invention provides a glue lowering assembly so that the glue lowering assembly, the drainage inner pipe, and the inner screen pipe respectively form a first glue delivery cavity and a second glue delivery cavity, thereby reducing the amount of glue entering the filling tool and avoiding waste and pollution of excess glue. 4. The present invention provides a water drainage mechanism, so that when filling the gravel layer with glue, the liquid in the second glue delivery cavity can be drained out first, thereby preventing the liquid from contaminating the sand-bonding glue and causing the quality of the sand-bonding glue to deteriorate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall front view structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the overall side structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention when viewed from the front as a whole.

[0019] Figure 4 For the present invention Figure 3 Enlarged schematic diagram at point A in the middle.

[0020] Figure 5 It is a structural schematic diagram of the outer tube for material discharge in the present invention.

[0021] Figure 6 For the present invention Figure 4 Enlarged schematic diagram at point D in the middle.

[0022] Figure 7 For the present invention Figure 3 Enlarged schematic diagram of point B in the middle.

[0023] Figure 8 For the present invention Figure 7 Enlarged schematic diagram at point E in the middle.

[0024] Fig. 9 It is a structural schematic diagram of the interception component in the present invention.

[0025] Fig.10 For the present invention Fig. 9 Enlarged schematic diagram at point G in the middle.

[0026] Fig.11 It is a structural schematic diagram of the guide ring in the present invention.

[0027] Fig.12 For the present invention Figure 3 Enlarged schematic diagram at point C in the middle.

[0028] Fig.13 For the present invention Fig.12 Enlarged schematic diagram at F in the middle.

[0029] In the attached figure: 1, drainage inner pipe; 2, material feeding outer pipe; 21, external connector; 22, outer sleeve; 23, guide cover; 24, guide groove; 3, connection end; 4, outer screen; 5, installation end; 6, screw plug; 7, glue lower assembly; 71, upper plug ball; 72, motor; 73, sealing inner pipe; 74, screw; 75, sealing sleeve; 76, glue outlet hole; 77, glue inlet hole; 78, plugging rod; 79, glue hole; 710, plugging platform; 8, Inner screen tube; 9. interception assembly; 91. trough; 92. upper end; 93. pull rod; 94. guide ring; 95. positioning hole; 96. lower end; 97. limiting hemisphere; 10. drainage mechanism; 101. compression spring; 102. second drainage hole; 103. water passage chamber; 104. drainage trough; 105. extrusion cone; 106. blocking cone; 107. mounting plate; 11. outer screen hole; 12. drainage hole; 13. inner screen hole; 14. lower blocking ball. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0032] like Figure 1-Figure 13 As shown, a filling tool for underground mining of a vertical well of petroleum provided by the present invention comprises an inner drainage pipe 1, a connector connected to an external drainage pipe is arranged on the top of the inner drainage pipe 1, a connecting end 3 is threadedly installed on the bottom of the inner drainage pipe 1, an inner screen pipe 8 is threadedly installed on one end of the connecting end 3, a plurality of inner screen holes 13 are opened on the side of the inner screen pipe 8, a thread plug 6 is threadedly installed on the bottom end of the inner screen pipe 8, a mounting end 5 is sleeved on the bottom of the inner screen pipe 8, the thread plug 6 abuts against the mounting end 5, an outer screen pipe 4 is installed on the mounting end 5, the outer diameter of the outer screen pipe 4 is slightly smaller than the inner diameter of the screen pipe, one end of the outer screen pipe 4 is installed on the connecting end 3, and the side of the outer screen pipe 4 is provided with a plurality of inner screen holes 13. A plurality of outer sieve holes 11 are provided, the aperture of the outer sieve holes 11 is smaller than the aperture of the sieve tube, the axis of the outer sieve tube 4 coincides with the axis of the inner sieve tube 8, a feeding outer pipe 2 is installed on the outer side of the drainage inner pipe 1, the top of the feeding outer pipe 2 is externally connected to the feeding pipe, the bottom of the feeding outer pipe 2 extends to the outside of the end of the outer sieve tube 4, the feeding outer pipe 2 is used to transport the sand-carrying liquid to the outside of the outer sieve tube 4, and make the sand and gravel fill the space between the vertical wellbore and the sieve tube, the sand-carrying liquid is a liquid containing sand and gravel, the sand and gravel in the sand-carrying liquid will be blocked by the sieve tube, and the liquid will enter the interior of the inner sieve tube 8 through the sieve tube, the outer sieve holes 11 and the inner sieve holes 13, and be discharged through the drainage inner pipe 1, so that an annular gravel layer is formed in the wellbore; An interception component 9 is sleeved on the outer side of the inner screen tube 8, and the interception component 9 is located between the outer screen tube 4 and the inner screen tube 8. The two ends of the interception component 9 are respectively abutted against the sides of the connecting end 3 and the mounting end 5. The interception component 9 is used to intercept small particles of gravel to avoid the loss of small particles of gravel and the reduction of filling efficiency.

[0033] When in use, firstly, sand-carrying liquid is delivered from the feeding outer pipe 2. When the sand and gravel form an annular sand and gravel layer outside the screen pipe, the liquid in the drainage inner pipe 1 and the inner screen pipe 8 is extracted, and then sand-adhesive glue, such as epoxy resin glue and acrylic glue and other water-resistant glue, is pumped into the drainage inner pipe 1 and the inner screen pipe 8. The sand-adhesive glue in the inner screen pipe 8 will be discharged from the inner screen hole 13, the interception component 9 and the outer screen hole 11. The sand-adhesive glue will penetrate into the sand and gravel layer through the screen pipe and bond the sand and gravel together with the screen pipe to prevent the sand and gravel from being loosened and to prevent part of the sand and gravel from passing through the screen pipe into the oil well, thereby preventing the oil from being contaminated. After the gravel layer is bonded, the excess sand-bonding glue in the drainage inner pipe 1 and the inner screen pipe 8 is extracted, and the device is moved to the next construction position, and then the above steps are repeated to fill the wellbore of the vertical well. When filling the gravel, the liquid will also flush out the sand-bonding glue in the outer screen pipe 4, the interception component 9, the inner screen pipe 8 and the drainage inner pipe 1 to avoid glue residue.

[0034] like Figure 1-Figure 5 As shown, a filling tool for underground mining of vertical wells of petroleum provided by the present invention, in this embodiment, the outer feeding pipe 2 includes an outer sleeve 22 fixedly installed on the outside of the drainage inner pipe 1, and an external connector 21 is arranged on the top of the outer feeding pipe 2, and the external connector 21 is used to connect with the feeding pipeline, and a guide cover 23 is arranged on the bottom of the outer sleeve 22, and the guide cover 23 is in a trumpet shape, and one end of the guide cover 23 extends to the outside of the end of the outer screen tube 4, and the inner diameter of the guide cover 23 is larger than the outer diameter of the screen tube, and a plurality of guide grooves 24 are opened inside the outer sleeve 22, and all of the guide grooves 24 are connected to the external connector 21 and the guide cover 23.

[0035] The sand-carrying liquid is fed from the feeding pipe into the outer casing 22 , and the sand-carrying liquid flows along the guide groove 24 and is discharged from the guide cover 23 to between the wellbore and the screen pipe.

[0036] like Figure 3 and Figure 7-Figure 12 As shown, a filling tool for underground mining of a vertical well of petroleum provided by the present invention is provided. In this embodiment, the interception assembly 9 includes an upper end 92 and a lower end 96, and the upper end 92 and the lower end 96 are connected by a plurality of tie rods 93. The sides of the upper end 92 and the lower end 96 are provided with a sink 91 adapted to the tie rod 93. The top of the upper end 92 abuts against the connecting end 3, and the bottom of the lower end 96 abuts against the mounting end 5. A plurality of guide rings 94 are penetrated and slidably installed on the tie rod 93, and the guide ring 94 is provided with a positioning hole 95 adapted to the tie rod 93. Each of the guide rings 94 The two sides of the guide ring 94 are fixedly connected with the limiting hemispheres 97. When the guide ring 94 is installed, the two adjacent limiting hemispheres 97 are in contact, so that a gap is left between the two adjacent guide rings 94, so as to facilitate the passage of liquid. The gap width between the two adjacent guide rings 94 is smaller than the diameter of the outer sieve hole 11 and the inner sieve hole 13, so that the multiple guide rings 94 can intercept small particles of gravel. Since the guide ring 94 is annular, liquid can pass through within 360° of its circumference. When gravel with a larger diameter is blocked on the outside of the guide ring 94, the liquid can still pass through the edge of the gravel, which effectively reduces the probability of the interception component 9 being blocked. In order to further reduce the amount of small grains of sand and gravel lost, the cross-section of the guide ring 94 is a stepped shape with an inclined surface, so that the cross-section of the gap formed between two adjacent guide rings 94 is inclined, extending the path of liquid flow. At the same time, since the vertical distance between the two inclined planes is smaller than the vertical distance between them, small grains of sand and gravel are more easily blocked by the edge of the guide ring 94. Since the gap width between the two guide rings 94 is smaller than the diameter of the outer sieve hole 11, the loss of small grains of sand and gravel is avoided, thereby improving the filling efficiency.

[0037] like Figure 7-Figure 12 As shown, a filling tool for underground mining of vertical wells of petroleum provided by the present invention is provided. After the guide ring 94 is partially blocked by gravel, the gravel inside the guide ring 94 can be flushed out through subsequent glue filling operations. In order to make it easier for the blocked gravel to escape from between the guide rings 94, in this embodiment, the diameter of the positioning hole 95 is larger than the diameter of the pull rod 93, and the distance between the limiting hemispheres 97 on the opposite sides of the two guide rings 94 at the two ends is smaller than the distance between the facing sides of the upper end 92 and the lower end 96, so as to leave space for the movement of the guide ring 94, so that the guide ring 94 can be tilted relative to the horizontal plane of the pull rod 93, thereby increasing the distance between two adjacent guide rings 94, making it easier for the gravel blocked between the guide rings 94 to escape, thereby avoiding the blockage of the interception component 9.

[0038] like Figure 3 , Figure 4 , Figure 6-Figure 8 and Figure 12-13 As shown, a filling tool for underground mining of a vertical well of petroleum provided by the present invention is provided. When performing the filling operation, due to the large diameters of the inner drainage pipe 1 and the inner screen pipe 8, a large amount of adhesive sand glue will remain in the inner drainage pipe 1 and the inner screen pipe 8. Although this part of the residual adhesive sand glue will be recovered, it has been contaminated in the inner drainage pipe 1 and the inner screen pipe 8, and its viscosity will be reduced. When this part of the adhesive sand glue is used again, the stability of the gravel layer will be reduced. If this part of the adhesive sand glue is discarded, it will cause a large waste of resources. Therefore, in this embodiment, a lower glue component 7 is also installed inside the inner drainage pipe 1, and a first adhesive delivery cavity can be formed between the lower glue component 7 and the inner drainage pipe 1, and a second adhesive delivery cavity can be formed between the lower glue component 7 and the inner screen pipe 8. One end of the first adhesive delivery cavity is connected to the interior of the inner drainage pipe 1, and one end of the second adhesive delivery cavity is connected to the inner screen hole 13. The adhesive sand glue transported from the inner drainage pipe 1 will be sent from the first adhesive delivery cavity to the second adhesive delivery cavity, and pass through the inner screen hole 13 and the interception component 9. , the outer sieve hole 11 and the sieve pipe are discharged to the gravel layer, which can greatly reduce the residual sand adhesive and save the use of sand adhesive.

[0039] like Figure 3 , Figure 4 , Figure 6-Figure 8 and Figure 12-13 As shown, a filling tool for underground mining of a vertical well of petroleum provided by the present invention, in this embodiment, the lower glue assembly 7 includes a sealing inner tube 73 fixedly connected to the inside of the drainage inner tube 1, a sealed annular first glue delivery cavity is formed between the sealing inner tube 73 and the drainage inner tube 1, and an annular second glue delivery cavity can be formed between the sealing inner tube 73 and the inner screen tube 8, the cross section of the first glue delivery cavity is an inverted trapezoid, the top of the sealing inner tube 73 is funnel-shaped, an upper blocking ball 71 is arranged on the top of the sealing inner tube 73, the diameter of the upper blocking ball 71 is larger than the minimum inner diameter of the sealing inner tube 73, and smaller than the inner diameter of the drainage inner tube 1, initially, the upper blocking ball 71 blocks the sealing inner tube 73, a glue inlet hole 77 connected to the drainage inner tube 1 is opened on the top of the sealing inner tube 73, and the glue inlet hole 77 is located outside the contact position between the upper blocking ball 71 and the sealing inner tube 73; A sealing sleeve 75 is slidably connected to the interior of the first glue delivery cavity. The sealing sleeve 75 is provided with a glue hole 79 for the sand glue to pass through. One end of the sealing sleeve 75 passes through the sealing inner tube 73 and extends to the interior of the inner screen tube 8. The outer diameter of the sealing sleeve 75 is smaller than the inner diameter of the inner screen tube 8. A blocking platform 710 adapted to the sealing sleeve 75 is installed at the inner bottom end of the inner screen tube 8. The blocking platform 710 is located below the inner screen hole 13. In order to allow the sand glue in the first glue delivery cavity to flow into the second glue delivery cavity, a plurality of glue outlet holes 76 communicating with the second glue delivery cavity are provided at the bottom of the sealing inner tube 73; In order not to affect the discharge of liquid and to make the second glue delivery chamber sealed, thereby preventing the sand glue from flowing into the inner screen tube 8, a motor 72 is installed in the first glue delivery chamber, and the output shaft of the motor 72 is fixedly connected to a screw 74, and the screw 74 is threadedly connected to a sealing sleeve 75. A protective cover is provided on the outer side of the motor 72, and a telescopic protective cover (not shown) is sleeved on the outer side of the screw 74, so as to prevent the sand glue from causing adverse effects on the motor 72 and the screw 74.

[0040] When filling glue, the glue delivery pipe is connected to the drainage inner pipe 1, and the motor 72 drives the screw 74 to rotate. The screw 74 drives the sealing sleeve 75 to descend, so that one end of the sealing sleeve 75 is against the side of the blocking platform 710, and glue is delivered to the drainage inner pipe 1 through the material pump. Since the upper blocking ball 71 blocks the inside of the sealing inner pipe 73, the sand-bonding glue will enter the first glue delivery cavity from the glue inlet hole 77 and flow into the second glue delivery cavity from the glue outlet hole 76. Then the sand-bonding glue will penetrate into the screen pipe and the gravel layer from the inner sieve hole 13, the interception component 9 and the outer sieve hole 11, and the sand-bonding glue will bond the gravel layer.

[0041] like Figure 3 , Figure 4 , Figure 6-Figure 8 and Figure 12-13 As shown, a filling tool for underground mining of vertical wells of petroleum provided by the present invention, after the glue filling operation is completed, the material pump stops supplying glue to the drainage inner tube 1, and extracts the sticky sand glue in the drainage inner tube 1, and at the same time, the motor 72 drives the sealing sleeve 75 to rise, at this time, the sticky sand glue in the first glue feeding chamber will flow out from the glue outlet hole 76, and when filling gravel again, the liquid will enter the first glue feeding chamber from the glue outlet hole 76 and be discharged from the glue inlet hole 77, and when the glue filling operation is performed again, the liquid in the first glue feeding chamber will contaminate the sticky sand glue, causing the stability of the gravel layer to decrease. In order to solve this problem, in this embodiment, the sealing sleeve 75 is fixedly connected to the side near the glue inlet hole 77 with a plugging rod 78, and one end of the plugging rod 78 can be inserted into the glue inlet hole 77 to block the glue inlet hole 77.

[0042] After the sand glue in the first glue delivery cavity flows out, the sealing sleeve 75 rises, and the sealing sleeve 75 drives the hole blocking rod 78 to block the glue inlet hole 77. When draining water, the air in the first glue delivery cavity cannot be discharged, so that the liquid in the inner screen tube 8 cannot enter the first glue delivery cavity. When filling glue again, contamination of the sand glue is avoided.

[0043] like Figure 3 , Figure 4 , Figure 12-13 As shown, a filling tool for underground mining of a vertical well of petroleum provided by the present invention is provided. When filling glue, the liquid in the inner screen tube 8 cannot be pumped out due to the obstruction of the upper plugging ball 71. During the descending process of the sealing sleeve 75, the liquid in the inner screen tube 8 will also enter the second glue delivery cavity. Although the sand glue can squeeze the liquid in the second glue delivery cavity back into the gravel layer again, the liquid also pollutes part of the sand glue. Therefore, in this embodiment, a water drainage mechanism 10 is further installed inside the inner screen tube 8. The water drainage mechanism 10 is installed on the plugging platform 710. When the sealing sleeve 75 descends to the plugging platform 710, the water drainage mechanism 10 is used to discharge the liquid in the second glue delivery cavity into the inside of the screw plug 6. In order to prevent the inside of the plug 6 from being filled with liquid and thus preventing the liquid in the second glue delivery cavity from being discharged, a funnel-shaped through hole is provided on the top of the blocking platform 710, and a lower blocking ball 14 is provided in the through hole. The lower blocking ball 14 blocks the through hole, thereby preventing the liquid in the inner screen tube 8 from entering the plug 6. In order to prevent liquid from accumulating inside the plug 6 , a drainage hole 12 communicating with the outside is opened on the side of the plug 6 , and the liquid entering the plug 6 will be discharged to the outside through the drainage hole 12 .

[0044] like Figure 3 , Figure 4 , Figure 12-13As shown, a filling tool for underground mining of a vertical well of petroleum provided by the present invention, in this embodiment, the water discharge mechanism 10 includes a water discharge groove 104 provided on a plugging platform 710, the water discharge groove 104 is an annular groove, the inner diameter of the water discharge groove 104 is the same as the inner diameter of the sealing sleeve 75, the outer diameter of the water discharge groove 104 is greater than the outer diameter of the sealing sleeve 75, and the water discharge mechanism 10 also includes a plurality of water discharge components; The drainage assembly includes a water passage chamber 103 provided inside the blocking platform 710, two first drainage holes are provided on the blocking platform 710, the water passage chamber 103 is communicated with the drainage groove 104 through the two first drainage holes, a second drainage hole 102 is provided on the blocking platform 710, the water passage chamber 103 is communicated with the screw plug 6 through the second drainage hole 102, a mounting plate 107 is slidably connected inside the water passage chamber 103, a compression spring 101 is connected between the mounting plate 107 and the side of the water passage chamber 103 close to the screw plug 6, a blocking cone 106 and an extrusion cone 105 are fixedly connected to the side of the mounting plate 107 close to the sealing sleeve 75, the blocking cone 106 and The extrusion cone 105 can be inserted into the two first drainage holes respectively and block the first drainage holes. The extrusion cone 105 is located directly below the sealing sleeve 75, and the blocking cone 106 is located outside the sealing sleeve 75. The height of the blocking cone 106 is smaller than that of the extrusion cone 105, so that the sealing sleeve 75 will first contact the extrusion cone 105. After the extrusion cone 105 is squeezed to the bottom, the blocking cone 106 can be retracted into the water passage cavity 103, thereby exposing the first drainage hole. The liquid in the second glue delivery cavity will flow from the first drainage hole to the water passage cavity 103, and flow from the second drainage hole 102 to the screw plug 6, and then be discharged from the drainage hole 12 to prevent the liquid from contaminating the sand adhesive. In order to prevent the sand adhesive from leaking from the first drainage hole, the height of the extrusion cone 105 is smaller than the depth of the drainage groove 104; In order to prevent a large liquid pressure from forcing the extrusion cone 105 and the blocking cone 106 to descend, the top end of the extrusion cone 105 and the blocking cone 106 are set to be conical. The cone can reduce the downward pressure from the liquid and prevent the liquid from leaking prematurely.

[0045] Directions: First, connect the drainage inner pipe 1 to the drainage pipe, connect the feeding outer pipe 2 to the feeding pipe, fix the screen pipe to the wellbore, and then lower the filling tool into the screen pipe; Then, the sand-carrying liquid is pumped from the feeding pipeline, and the sand-carrying liquid is discharged from the feeding outer pipe 2 to the vertical well outside the screen pipe. The screen pipe, the outer screen pipe 4 and the interception component 9 will block the sand and gravel in the sand-carrying liquid from passing through, while the liquid in the sand-carrying liquid will pass through the screen pipe, the outer screen hole 11, the interception component 9 and the inner screen hole 13, and then enter the interior of the inner screen pipe 8, and under a relatively large pressure, the liquid is discharged from the drainage inner pipe 1 and the drainage pipe; When the gravel forms an annular gravel layer on the outside of the screen tube, the liquid in the drainage inner tube 1 above the upper plugging ball 71 is extracted, and the drainage inner tube 1 is connected to the rubber feeding pipe. At the same time, the motor 72 drives the sealing sleeve 75 to descend through the screw 74, so that the sealing sleeve 75 falls into the drainage groove 104, and squeezes the extrusion cone 105 to descend, thereby opening the first drainage hole, so that the liquid in the second rubber feeding chamber is discharged. When the liquid in the second rubber feeding chamber is completely discharged, the motor 72 drives the sealing sleeve 75 to rise again, and the end of the sealing sleeve 75 is always located in the drainage groove 104, so that the blocking cone 106 and the extrusion cone 105 block the first drainage hole again to prevent the sand glue from leaking. Then, the sand glue is pumped into the inner drainage pipe 1 through the material pump. The sand glue enters the first glue feeding cavity through the glue inlet hole 77 and flows into the second glue feeding cavity through the glue outlet hole 76. The sand glue passes through the inner sieve hole 13, the interception component 9, the outer sieve hole 11 and the sieve tube in sequence and penetrates into the gravel layer. The sand glue firmly bonds the gravel layer to prevent the gravel from loosening. When the gravel layer is bonded, the excess sand adhesive in the drainage inner pipe 1 above the upper plugging ball 71 is extracted, and the device is moved to the next construction position. Under the action of gravity, the excess sand adhesive in the first adhesive delivery chamber and the second adhesive delivery chamber will still be discharged into the vertical well through the outer sieve hole 11 and flow to the top of the gravel layer to reinforce the gravel layer. This part of the sand adhesive will not be wasted. Then, the motor 72 drives the sealing sleeve 75 back to the initial position of the sealing sleeve 75, and the rubber delivery pipe connected to the drainage inner pipe 1 is replaced with a drainage pipe, and then the above steps are repeated to continuously fill the wellbore of the vertical well.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A filling tool for underground mining of a vertical petroleum well, comprising a drainage inner tube (1), characterized in that: The bottom of the drainage inner pipe (1) is threadedly mounted with a connecting end (3), one end of the connecting end (3) is threadedly mounted with an inner screen tube (8), a side of the inner screen tube (8) is provided with a plurality of inner screen holes (13), the bottom end of the inner screen tube (8) is threadedly mounted with a thread plug (6), the bottom of the inner screen tube (8) is sleeved with a mounting end (5), the thread plug (6) is in contact with the mounting end (5), an outer screen tube (4) is mounted on the mounting end (5), the outer diameter of the outer screen tube (4) is smaller than the inner diameter of the screen tube, and the outer screen tube (4) is One end of the drain pipe (1) is mounted on the connecting end (3); a plurality of outer sieve holes (11) are provided on the side of the outer sieve pipe (4); the aperture of the outer sieve holes (11) is smaller than the aperture of the sieve pipe; the axis of the outer sieve pipe (4) coincides with the axis of the inner sieve pipe (8); a feed outer pipe (2) is installed on the outer side of the drainage inner pipe (1); the bottom end of the feed outer pipe (2) extends to the outside of the end of the outer sieve pipe (4); the feed outer pipe (2) is used to transport the sand-carrying fluid to the outside of the outer sieve pipe (4) and allow the sand and gravel to fill the space between the vertical wellbore and the sieve pipe; An interception assembly (9) is sleeved on the outer side of the inner screen tube (8), the interception assembly (9) is located between the outer screen tube (4) and the inner screen tube (8), and the two ends of the interception assembly (9) are respectively abutted against the side surfaces of the connecting end (3) and the mounting end (5), and the interception assembly (9) is used to intercept small particles of gravel.

2. The filling tool for underground mining of vertical wells of petroleum according to claim 1, characterized in that: The discharge outer pipe (2) comprises an outer sleeve (22) fixedly mounted on the outside of the drainage inner pipe (1); an outer connector (21) is arranged at the top of the discharge outer pipe (2); a flow guide cover (23) is arranged at the bottom of the outer sleeve (22); the flow guide cover (23) is in a bell-mouth shape; one end of the flow guide cover (23) extends to the outside of the end of the outer screen tube (4); the inner diameter of the flow guide cover (23) is larger than the outer diameter of the screen tube; a plurality of flow guide grooves (24) are arranged inside the outer sleeve (22); all of the flow guide grooves (24) are connected to the outer connector (21) and the flow guide cover (23).

3. The filling tool for underground mining of vertical wells of petroleum according to claim 1, characterized in that: The interception assembly (9) comprises an upper end (92) and a lower end (96), wherein the upper end (92) and the lower end (96) are connected via a plurality of tie rods (93), and the sides of the upper end (92) and the lower end (96) are provided with recessed grooves (91) adapted to the tie rods (93), the top of the upper end (92) is in contact with the connecting end (3), and the bottom of the lower end (96) is in contact with the mounting end (5), and a plurality of guide rings (94) are passed through and slidably mounted on the tie rods (93), and the guide rings (94) are provided with positioning holes (95) adapted to the tie rods (93), and both sides of each guide ring (94) are fixedly connected to limit hemispheres (97), and when the guide rings (94) are installed, two adjacent limit hemispheres (97) are in contact; The cross section of the guide ring (94) is a stepped shape with an inclined surface.

4. The filling tool for underground mining of vertical wells of petroleum according to claim 3, characterized in that: The diameter of the positioning hole (95) is greater than the diameter of the pull rod (93), and the distance between the limiting hemispheres (97) on the opposite sides of the two guide rings (94) at the two ends is less than the distance between the opposite sides of the upper end (92) and the lower end (96).

5. The filling tool for underground mining of vertical wells of petroleum according to claim 1, characterized in that: A lower glue assembly (7) is also installed inside the inner drainage tube (1); a first glue delivery cavity can be formed between the lower glue assembly (7) and the inner drainage tube (1); a second glue delivery cavity can be formed between the lower glue assembly (7) and the inner sieve tube (8); one end of the first glue delivery cavity is in communication with the interior of the inner drainage tube (1); and one end of the second glue delivery cavity is in communication with the inner sieve hole (13).

6. The filling tool for underground mining of vertical wells of petroleum according to claim 5, characterized in that: The lower glue assembly (7) comprises a sealing inner tube (73) fixedly connected to the inside of the drainage inner tube (1); a sealed annular first glue delivery cavity is formed between the sealing inner tube (73) and the drainage inner tube (1); a second annular glue delivery cavity can be formed between the sealing inner tube (73) and the inner screen tube (8); the cross section of the first glue delivery cavity is an inverted trapezoid; the top of the sealing inner tube (73) is funnel-shaped; an upper blocking ball (71) is provided at the top of the sealing inner tube (73); the diameter of the upper blocking ball (71) is larger than the minimum inner diameter of the sealing inner tube (73) and smaller than the inner diameter of the drainage inner tube (1); initially, the upper blocking ball (71) blocks the sealing inner tube (73); a glue inlet hole (77) connected to the drainage inner tube (1) is provided at the top of the sealing inner tube (73); the glue inlet hole (77) is located outside the contact position between the upper blocking ball (71) and the sealing inner tube (73); A sealing sleeve (75) is slidably connected to the interior of the first glue delivery cavity, and a glue hole (79) is provided on the sealing sleeve (75) for the sand glue to pass through. One end of the sealing sleeve (75) passes through the sealing inner tube (73) and extends into the interior of the inner screen tube (8). The outer diameter of the sealing sleeve (75) is smaller than the inner diameter of the inner screen tube (8). A sealing platform (710) adapted to the sealing sleeve (75) is installed at the bottom end of the interior of the inner screen tube (8), and the sealing platform (710) is located below the inner screen hole (13); The bottom of the sealed inner tube (73) is provided with a plurality of glue outlet holes (76) which are in communication with the second glue delivery cavity; An electric motor (72) is installed in the first glue delivery cavity, the output shaft of the electric motor (72) is fixedly connected to a screw rod (74), the screw rod (74) and the sealing sleeve (75) are threadedly connected, a protective cover is provided on the outer side surface of the electric motor (72), and a telescopic protective cover is sleeved on the outer side surface of the screw rod (74).

7. The filling tool for underground mining of vertical wells of petroleum according to claim 6, characterized in that: A hole blocking rod (78) is fixedly connected to the side of the sealing sleeve (75) close to the glue inlet hole (77); one end of the hole blocking rod (78) can be inserted into the glue inlet hole (77) to block the glue inlet hole (77).

8. The filling tool for underground mining of vertical wells of petroleum according to claim 6, characterized in that: A water discharge mechanism (10) is also installed inside the inner screen tube (8). The water discharge mechanism (10) is installed on the plugging platform (710). When the sealing sleeve (75) descends onto the plugging platform (710), the water discharge mechanism (10) is used to discharge the liquid in the second glue delivery cavity into the interior of the screw plug (6); A funnel-shaped through hole is provided on the top of the blocking platform (710), a lower blocking ball (14) is arranged in the through hole, and the lower blocking ball (14) blocks the through hole; A drainage hole (12) communicating with the outside is provided on the side of the wire plug (6).

9. The filling tool for underground mining of vertical wells of petroleum according to claim 8, characterized in that: The water drainage mechanism (10) comprises a water drainage groove (104) provided on the sealing platform (710); the water drainage groove (104) is an annular groove; the inner diameter of the water drainage groove (104) is the same as the inner diameter of the sealing sleeve (75); the outer diameter of the water drainage groove (104) is greater than the outer diameter of the sealing sleeve (75); the water drainage mechanism (10) further comprises a plurality of water drainage components; The water drainage assembly comprises a water passage chamber (103) provided inside the plugging platform (710), two first water drainage holes provided on the plugging platform (710), the water passage chamber (103) being in communication with the water drainage groove (104) via the two first water drainage holes, a second water drainage hole (102) provided on the plugging platform (710), the water passage chamber (103) being in communication with the screw plug (6) via the second water drainage hole (102), a mounting plate (107) being slidably connected inside the water passage chamber (103), the mounting plate (107) and the water passage chamber (103) being close to the screw plug (6). A compression spring (101) is connected between the side surfaces of the plug (6); a plugging cone (106) and an extrusion cone (105) are fixedly connected to the side surface of the mounting plate (107) close to the sealing sleeve (75); the plugging cone (106) and the extrusion cone (105) can be respectively inserted into the two first drainage holes to block the first drainage holes; the extrusion cone (105) is located directly below the sealing sleeve (75); the plugging cone (106) is located outside the sealing sleeve (75); and the height of the plugging cone (106) is less than the height of the extrusion cone (105); The height of the extrusion cone (105) is smaller than the depth of the drainage trough (104); The top ends of the extrusion cone (105) and the blocking cone (106) are arranged in a conical shape.

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