Reinforced composite sand control screen pipe and sand control method

Abstract

The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a reinforced composite sand control screen pipe and a sand control method. The anti-sand pipe comprises a base pipe and an anti-sand mechanism, the sand prevention mechanism is connected to the outer portion of the base pipe in a sleeving mode and communicated with the base pipe. On-site conditions are fully considered, precision stability and durability are improved on the basis that high-pressure airflow is guided through side flow holes of a filter screen armor, radial erosion is reduced, and a precise filter layer is wound with less welding, secondary filtering is guaranteed through radial prefabricated winding wires, and effective airflow pressure gradient is formed by fully utilizing pore space changes, so that secondary filtering is guaranteed. The impact energy on the working pipe is dispersed, the durability of the performance of each working layer is improved, and the overall service life of the screen pipe is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas exploitation, and in particular relates to a reinforced composite sand control screen pipe and a sand control method. Background Art

[0002] When exploiting abnormally high-pressure gas reservoirs, as the formation pressure decreases, the effective pressure on the rock skeleton increases, the rocks near the wellbore and in the diversion gaps are broken, and the rock cuttings are discharged; at the same time, due to the reflux of fracturing sand, a large amount of sand is produced. Because the formation pressure is high and the gas production is large, only screens can be used for sand control.

[0003] There are many types of screen tubes used in the prior art, and each screen tube has the following characteristics: The metal wool screen tube has the problem of ineffective sand control accuracy, serious blockage, easy damage, short service life and low mechanical strength.

[0004] The slotted screen pipe has poor mechanical properties and corrosion resistance, and a small flow area, and is not suitable for the sand control requirements of the high-pressure gas well project of this project. The slotted screen pipe has surface filtering characteristics and is not easy to clog.

[0005] The wire-wound screen has serious defects in the manufacturing of raw material trapezoidal wire, wire welding, whether to set a protective cover, the performance, strength and rigidity of the protective cover, and the integrated structural design. The reasons for the failure of sand control are mainly mechanical and mechanical problems, with many factors and difficult to improve. The wire-wound screen has the characteristics of trapezoidal slit filtration, is not easy to clog, and the stainless steel wire surface and fluid contact surface have excellent corrosion and wear resistance.

[0006] The above-mentioned various screens all have defects to varying degrees and cannot fully meet the on-site needs of high-yield oil and gas wells. For this reason, it is necessary to design and develop a sand-proof pipe with precise sand blocking, large flux and strong durability. Summary of the invention

[0007] The present invention provides a reinforced composite sand control screen pipe and a sand control method, the main purpose of which is to provide a sand control device and a sand control method that can reduce radial erosion, improve precision stability and durability, reduce impact energy on the working pipe, improve the durability of each working layer performance, and extend the overall service life of the screen pipe.

[0008] To achieve the above object, the technical solution adopted by the present invention is: A reinforced composite sand control screen pipe comprises a base pipe and a sand control mechanism; the sand control mechanism is connected to the outside of the base pipe and communicated with the base pipe.

[0009] The base pipe is a circular hollow pipe, the outer wall of one end of which is provided with a connecting thread, and the outer diameter of the other end is larger than the outer diameter of the middle part; a plurality of through holes connected with the sand control mechanism are opened on the side wall of the base pipe.

[0010] The plurality of through holes are arranged in a spiral shape.

[0011] The base pipe is made of alloy steel N80.

[0012] The sand prevention mechanism includes an anti-collision receiver, a filter mesh armor, a precision wire mesh composite layer and a prefabricated reinforced wire winding layer; the prefabricated reinforced wire winding layer is circumferentially arranged on the outer wall of the base pipe, and the two ends of the prefabricated reinforced wire winding layer are respectively fixed by inner end rings; the outer end of each inner end ring is surrounded by an anti-collision receiver connected to the base pipe; the precision wire mesh composite layer is wrapped around the outer circumference of the prefabricated reinforced wire winding layer, and the two ends of the precision wire mesh composite layer are respectively placed between the inner end ring and the anti-collision receiver; the filter mesh armor is circumferentially arranged at the outermost side, and the two ends of the filter mesh armor are respectively connected to two anti-collision receivers.

[0013] The anti-collision receiver is an integrated structure consisting of a cone and two circular rings with different outer diameters; the large outer diameter circular ring is placed between the cone and the small outer diameter circular ring; the cone is provided with a through hole matching the outer diameter of the base pipe along the central axis; the inner diameter of the connecting end between the large outer diameter circular ring and the cone is equal to the diameter of the through hole in the cone, the inner diameter of the connecting end between the large outer diameter circular ring and the small outer diameter circular ring is equal to the inner diameter of the small outer diameter circular ring, and the inner diameter of the small outer diameter circular ring is larger than the inner diameter of the central through hole of the cone; a filter armor is connected to the outer wall of the small outer diameter circular ring.

[0014] The filter armor is a stainless steel belt made of 316L stainless steel material and having a thickness of 1.5 mm. The filter armor is punched and stretched to form transverse armor side flow holes for changing the flow direction of the medium.

[0015] The surface of the filter armor is treated by cold working and hardening; the opening rate of the filter armor is greater than 55%.

[0016] The precision wire mesh composite layer is made by adopting a twill reinforced composite weaving process; the prefabricated reinforced winding wire layer adopts radial prefabricated winding wire.

[0017] A sand control method for pressure completion of an oil and gas well, using a reinforced composite sand control screen, comprises the following steps: Step 1: Connect the reinforced composite sand control screen used for pressure completion of oil and gas wells to the oil pipe and then lower it into the well; Step 2: The medium in the oil and gas well enters the precision wire mesh composite layer through the filter armor on the sand control mechanism and is separated from the sand by primary filtration; Step 3: The medium after primary separation is filtered and separated in a secondary stage through a prefabricated reinforced wire winding layer; Step 4: After secondary separation, the medium enters the interior of the base tube through the through hole on the base tube and is then discharged.

[0018] Beneficial effects: (1) The filter armor in the present invention forms transverse side flow holes after stamping and stretching. After the high-pressure airflow is guided through the side flow holes of the filter armor, the flow direction of the medium is changed, effectively reducing radial erosion of the equipment, thereby extending its service life.

[0019] (2) In the present invention, the precision wire mesh composite layer is wound around the periphery of the prefabricated reinforcing wire winding layer, which improves the accuracy, stability and durability on the basis of reducing welding.

[0020] (3) The prefabricated reinforced wire winding layer in the present invention utilizes radial prefabricated wire winding to ensure the effect of secondary filtration, and fully utilizes the change in pore space to form an effective airflow pressure gradient, disperses the impact energy on the working pipe, improves the durability of the performance of each working layer, and extends the overall service life of the screen pipe.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a structural cross-sectional view of the present invention.

[0024] Figure 2 It is a front view of the present invention.

[0025] Figure 3 Schematic diagram of the spiral hole structure of the base pipe.

[0026] Figure 4 Schematic diagram of the opening structure of the filter armor.

[0027] Figure 5 for Figure 4 AA enlarged cross-sectional view.

[0028] Figure 6 for Figure 5 Enlarged cross-sectional view of the middle BB.

[0029] Figure 7 It is a cross-sectional view of the anti-collision receiver in the present invention.

[0030] Figure 8 It is a partial longitudinal section stereoscopic schematic diagram of the side flow hole of the armor in the present invention.

[0031] Fig. 9 It is a partial cross-sectional stereoscopic schematic diagram of the side flow hole of the armor in the present invention.

[0032] Fig.10 It is a schematic diagram of the structure of the square mesh in the present invention.

[0033] Fig.11 It is a structural side view of the square mesh in the present invention.

[0034] Fig.12 It is a schematic diagram of the structure of the prefabricated reinforcing wire winding layer in the present invention.

[0035] In the figure: 1. base pipe; 2. sand prevention mechanism; 3. anti-collision receiver; 4. filter armor; 5. precision wire mesh composite layer; 6. prefabricated reinforced wire winding layer; 7. through hole; 8. armor side flow hole; 9. inner end ring; 10. square hole mesh. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Embodiment 1: according to Figure 1-Figure 12 The reinforced composite sand control screen shown comprises a base pipe 1 and a sand control mechanism 2 ; the sand control mechanism 2 is sleeved on the outside of the base pipe 1 and communicated with the base pipe 1 .

[0038] In actual use, the reinforced composite sand control screen used for pressure completion of oil and gas wells is connected to the oil pipe and then lowered into the well; thereafter, the medium in the oil and gas well is subjected to two-stage filtration separation by the sand control mechanism 2; the medium after the secondary separation enters the interior of the base pipe 1 through the through hole 7 on the base pipe 1 and is then discharged.

[0039] After secondary separation, the invention can fully meet the on-site needs of high-yield oil and gas wells and has a good sand control effect.

[0040] Embodiment 2: according to Figure 1-Figure 3 The reinforced composite sand control screen shown in the figure is different from the embodiment 1 in that: the base pipe 1 is a circular hollow tube, the outer wall of one end of which is provided with a connecting thread, and the outer diameter of the other end is larger than the outer diameter of the middle part; a plurality of through holes 7 connected to the sand control mechanism 2 are opened on the side wall of the base pipe 1.

[0041] In actual use, the base pipe 1 adopts the technical solution, which not only enables it to be well connected with the sand control mechanism 2, but also ensures the stability of the connection of the sand control mechanism 2 and ensures the sand control effect.

[0042] Embodiment three: according to Figure 3 The reinforced composite sand control screen shown is different from the first embodiment in that a plurality of the reinforced composite sand control screens are arranged in a spiral shape.

[0043] In actual use, the through holes 7 are arranged in a spiral shape, so that the number of holes arranged on the side wall of the base tube 1 in the axial and radial directions is uniform, thereby ensuring that the strength of the base tube 1 is not affected.

[0044] Embodiment 4: according to Figure 1-Figure 3 The reinforced composite sand control screen shown is different from the first or second embodiment in that the base pipe 1 is made of alloy steel N80.

[0045] In actual use, the base pipe 1 is made of alloy steel N80 to ensure that it has good strength, high strength, wear resistance and corrosion resistance, which can effectively extend the service life of the equipment and thus ensure the continuity of production.

[0046] Embodiment five: according to Figure 1 , Figure 4-Figure 6 , Figure 10-12 A reinforced composite sand-control screen pipe shown in the figure is different from the first embodiment in that: the sand-control mechanism 2 includes an anti-collision receiver 3, a filter armor 4, a precision wire mesh composite layer 5 and a prefabricated reinforced wire winding layer 6; the prefabricated reinforced wire winding layer 6 is arranged on the outer wall of the base pipe 1 along the circumferential portion, and the two ends of the prefabricated reinforced wire winding layer 6 are respectively fixed by an inner end ring 9; the outer end of each inner end ring 9 is surrounded by an anti-collision receiver 3 connected to the base pipe 1; the precision wire mesh composite layer 5 is wrapped around the outer circumference of the prefabricated reinforced wire winding layer 6, and the two ends of the precision wire mesh composite layer 5 are respectively placed between the inner end ring 9 and the anti-collision receiver 3; the filter armor 4 is arranged at the outermost side along the circumferential direction, and the two ends of the filter armor 4 are respectively connected to two anti-collision receivers 3.

[0047] In actual use, the anti-collision receiver 3 is the connection structure between the sand control element and the base pipe 1. The base pipe 1 and the anti-collision receiver 3 are fixed by welding, so that the connection between the anti-collision receiver 3 and the base pipe 1 is more stable; at the same time, during the process of the screen pipe going down the well, the anti-collision receiver 3 withstands the impact of the well wall and plays a protective role for the sand control mechanism 2. The filter armor 4 protects the internal filter when the sand control screen pipe is laterally scratched, collided, or squeezed with the inner wall of the wellbore or casing under various operating conditions; the precision wire mesh composite layer 5 plays the role of primary filtration, and the prefabricated reinforced wire winding layer 6 plays the role of secondary filtration, ensuring the accuracy of filtration.

[0048] The precision wire mesh composite layer 5 is wound around the periphery of the prefabricated reinforcing wire winding layer 6, which can enhance the integrity on the one hand, and reduce the influence of resistance welding on the wire mesh filtering accuracy and welding stress on the other hand.

[0049] In order to ensure the sand prevention effect, the precision wire mesh composite layer 5 of this embodiment adopts a double-layer filter screen, and a square hole mesh 10 is arranged between the two layers of filter screens. The square hole mesh 10 is used to support diversion to overcome the problem of easy clogging of the precision wire mesh.

[0050] Embodiment six: according to Figure 1 and Figure 7 The reinforced composite sand-proof screen shown in the embodiment is different from the fifth embodiment in that: the anti-collision receiver 3 is an integrated structure consisting of a cone and two circular rings of different outer diameters; the large outer diameter circular ring is placed between the cone and the small outer diameter circular ring; the cone is provided with a through hole matching the outer diameter of the base pipe 1 along the central axis; the inner diameter of the connecting end of the large outer diameter circular ring and the cone is equal to the diameter of the through hole in the cone, the inner diameter of the connecting end of the large outer diameter circular ring and the small outer diameter circular ring is equal to the inner diameter of the small outer diameter circular ring, and the inner diameter of the small outer diameter circular ring is larger than the inner diameter of the central through hole of the cone; a filter armor 4 is connected to the outer side wall of the small outer diameter circular ring, and the outer diameter of the small outer diameter circular ring where the filter armor 4 is connected is smaller than the outer diameter of the small outer diameter circular ring at other locations.

[0051] In actual use, the truncated cone portion of the anti-collision receptor 3 is sleeved on the base pipe 1 and welded to the base pipe 1. The inner end ring 9 is placed inside two circular rings of different outer diameters, and the circumferentially surrounding prefabricated reinforced wire layer 6 is fixed by the inner end ring 9, and the precision wire mesh composite layer 5 is fixed by the inner end ring 9 and the anti-collision receptor 3. The filter armor 4 is wrapped in the outermost layer, and its two ends are respectively connected to the anti-collision receptor 3 on both sides, and the outer wall of the filter armor 4 is flush with the outer walls of the two circular rings of different outer diameters of the anti-collision receptor 3, so that it is smoother when going down the well.

[0052] Embodiment seven: according to Figure 1 , Figure 4-6 , Figure 8 and Fig. 9 The reinforced composite sand-control screen shown is different from the fifth or sixth embodiment in that the filter armor 4 is a stainless steel belt made of 316L stainless steel material with a thickness of 1.5 mm; the filter armor 4 is formed by stamping and stretching to form transverse armor side flow holes 8 for changing the flow direction of the medium.

[0053] In actual use, the filter armor 4 is made of 316L stainless steel, which has strong corrosion resistance. It can maintain a good condition for a long time in the outermost environment to protect the sand control pipe from lateral scratches, collisions, and extrusions with the inner wall of the wellbore or casing under various operating conditions.

[0054] The armor side flow hole 8 adopts this design to form a double-layer three-dimensional opening structure, so that it has forward and lateral three-dimensional channels, changes the flow direction of the medium, and effectively reduces the radial erosion of the medium in the well on the equipment, thereby extending its service life.

[0055] Embodiment eight: according to Figure 1 , Figure 4-6 , Figure 8 and Fig. 9 The reinforced composite sand control screen shown is different from the seventh embodiment in that the surface of the filter armor 4 is cold-worked and hardened; and the opening rate of the filter armor 4 is greater than 55%.

[0056] In actual use, the surface of the filter armor 4 is cold-hardened to maximize its hardness, wear resistance and corrosion resistance. The opening rate of the filter armor 4 is greater than 55%, which greatly increases the effective flow area of ​​the armor, has little obstruction on the surface of the filter material, and maximizes the cross-sectional flow of the high-pressure airflow.

[0057] Embodiment nine: according to Figure 1 The reinforced composite sand control screen shown is different from the fifth embodiment in that the precision wire mesh composite layer 5 is made by using a twill reinforced composite weaving process; and the prefabricated reinforced wire winding layer 6 uses radial prefabricated wire winding.

[0058] In actual use, the precision wire mesh composite layer 5 is the decisive part that determines the sand-blocking filtration accuracy. It adopts a twill reinforced composite weaving process. Compared with plain weaving, under the same mesh count, the wire diameter is larger and the mesh size is smaller, making it more precise, stronger, and more resistant to airflow impact.

[0059] The prefabricated reinforced wire winding layer 6 adopts radial prefabricated wire winding, which draws on the high strength and precise gap control principle of the wire winding screen tube, so that the filtration accuracy guarantee time is increased by more than 10 times.

[0060] Embodiment ten: Reference Figure 1-Figure 12 A sand control method for pressure completion of oil and gas wells, using a reinforced composite sand control screen, comprises the following steps: Step 1: Connect the reinforced composite sand control screen used for pressure completion of oil and gas wells to the oil pipe and then lower it into the well; Step 2: The medium in the oil and gas well enters the precision wire mesh composite layer 5 through the filter armor 4 on the sand control mechanism 2, and is separated from the sand by primary filtration; Step 3: The medium after primary separation is filtered and separated in a secondary stage through a prefabricated reinforced wire winding layer; Step 4: After the secondary separation, the medium enters the interior of the base tube 1 through the through hole 7 on the base tube 1 and is then discharged.

[0061] The present invention has significantly enhanced filtering accuracy, anti-clogging ability, flow area and impact resistance of the medium compared with the five prior arts. The filter armor in the present invention forms transverse side flow holes after stamping and stretching. After the high-pressure airflow is guided through the side flow holes of the filter armor, the flow direction of the medium is changed, which effectively reduces the radial erosion of the equipment, thereby extending the service life of the equipment.

[0062] In the present invention, the precision wire mesh composite layer is wound around the periphery of the prefabricated reinforced wire winding layer, thereby improving the precision, stability and durability on the basis of less welding.

[0063] The prefabricated reinforced wire winding layer in the present invention utilizes radial prefabricated wire winding to ensure the effect of secondary filtration, and fully utilizes the pore space change to form an effective airflow pressure gradient, disperses the impact energy on the working pipe, improves the durability of the performance of each working layer, and extends the overall service life of the screen pipe.

[0064] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0065] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0066] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0067] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A reinforced composite sand control screen, characterized in that: It comprises a base pipe (1) and a sand prevention mechanism (2); the sand prevention mechanism (2) is sleeved on the outside of the base pipe (1) and is in communication with the base pipe (1).

2. A reinforced composite sand control screen according to claim 1, characterized in that: The base pipe (1) is a circular hollow pipe, the outer wall of one end of which is provided with a connecting thread, and the outer diameter of the other end is larger than the outer diameter of the middle part; a plurality of through holes (7) connected to the sand control mechanism (2) are provided on the side wall of the base pipe (1).

3. A reinforced composite sand control screen as claimed in claim 2, characterized in that: The plurality of through holes (7) are arranged in a spiral shape.

4. A reinforced composite sand control screen according to claim 1 or 2, characterized in that: The base pipe (1) is made of alloy steel N80.

5. The reinforced composite sand control screen according to claim 1, characterized in that: The sand prevention mechanism (2) comprises an anti-collision receiver (3), a filter armor (4), a precision wire mesh composite layer (5) and a prefabricated reinforced wire winding layer (6); the prefabricated reinforced wire winding layer (6) is arranged on the outer wall of the base pipe (1) along the circumferential portion, and the two ends of the prefabricated reinforced wire winding layer (6) are respectively fixed by inner end rings (9); the outer end of each inner end ring (9) is surrounded by an anti-collision receiver (3) connected to the base pipe (1); the precision wire mesh composite layer (5) is wound around the outer circumference of the prefabricated reinforced wire winding layer (6), and the two ends of the precision wire mesh composite layer (5) are respectively placed between the inner end ring (9) and the anti-collision receiver (3); the filter armor (4) is arranged at the outermost side along the circumferential direction, and the two ends of the filter armor (4) are respectively connected to the two anti-collision receivers (3).

6. A reinforced composite sand control screen as claimed in claim 5, characterized in that: The anti-collision receiver (3) is an integrated structure consisting of a truncated cone and two circular rings of different outer diameters; the circular ring with a large outer diameter is placed between the truncated cone and the circular ring with a small outer diameter; the truncated cone is provided with a through hole matching the outer diameter of the base tube (1) along the central axis; the inner diameter of the connecting end of the circular ring with a large outer diameter and the truncated cone is equal to the diameter of the through hole in the truncated cone, the inner diameter of the connecting end of the circular ring with a large outer diameter and the circular ring with a small outer diameter is equal to the inner diameter of the circular ring with a small outer diameter, and the inner diameter of the circular ring with a small outer diameter is larger than the inner diameter of the through hole in the center of the truncated cone; a filter armor (4) is connected to the outer wall of the circular ring with a small outer diameter.

7. A reinforced composite sand control screen according to claim 5 or 6, characterized in that: The filter screen armor (4) is a stainless steel strip made of 316L stainless steel material and having a thickness of 1.5 mm; the filter screen armor (4) is formed by stamping and stretching to form transverse armor side flow holes (8) for changing the flow direction of the medium.

8. The reinforced composite sand control screen according to claim 7, characterized in that: The surface of the filter screen armor (4) is subjected to cold working hardening treatment; the opening rate of the filter screen armor (4) is greater than 55%.

9. The reinforced composite sand control screen according to claim 5, characterized in that: The precision wire mesh composite layer (5) is manufactured by adopting a twill reinforced composite weaving process; and the prefabricated reinforced winding wire layer (6) adopts radial prefabricated winding wire.

10. A sand control method for pressure completion of oil and gas wells, characterized by: The reinforced composite sand control screen according to any one of claims 1 to 9 is used, comprising the following steps: Step 1: Connect the reinforced composite sand control screen used for pressure completion of oil and gas wells to the oil pipe and then lower it into the well; Step 2: The medium in the oil and gas well passes through the filter armor (4) on the sand control mechanism (2) and enters the precision wire mesh composite layer (5), and is separated from the sand by primary filtration; Step 3: The medium after primary separation is subjected to secondary filtration separation through a prefabricated enhanced wire winding layer; Step 4: After the secondary separation, the medium enters the interior of the base tube (1) through the through hole (7) on the base tube (1) and is then discharged.

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