Pre-packed sand control screen pipe based on direct-wound wire-wrapped structure and sand control system

Abstract

The utility model belongs to oil and gas exploitation field discloses a kind of prepack sand control screen pipe and sand control system based on direct-wound wire structure, sand control screen pipe includes direct-wound layer, outer wire layer and prepack chamber, and prepack chamber is filled with prepack particle;Direct-wound layer includes one transverse steel wire and multiple longitudinal bones, and multiple longitudinal bones are arranged along the circumferential direction and constitute cylindrical structure, and one transverse steel wire is spirally wound on multiple longitudinal bones with constant pitch, and there is first aperture between any two adjacent transverse steel wire coils.Sand control system includes above-mentioned sand control screen pipe, and further include base pipe provided with several flow holes;Multiple longitudinal bones are fixedly arranged on the outer wall of base pipe along the circumference of base pipe;Outer wire layer and base pipe are fixedly connected by connecting piece.The utility model eliminates the larger gap between the outer wall of base pipe and the innermost layer of existing screen sleeve, increases the effective thickness of prepack chamber, and improves sand control effect;The utility model is suitable for oil and gas exploitation industry.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas extraction, specifically a pre-filled sand-proof screen pipe and sand-proof system based on a straight-winding wire structure. Background Technology

[0002] Sand production in oil wells is a common problem in oilfield development. Mechanical sand control is the dominant technology, which typically uses a sand control screen as a core component to form a physical barrier to prevent formation sand from entering the wellbore. The specific principle is as follows: the produced sand fluid in the formation first passes through the sand control screen, which plays a role in blocking, filtering, and guiding the produced sand fluid. Ultimately, the sand particles in the produced sand fluid are blocked, while the liquid flows smoothly into the base pipe along the guide holes set on the pipe wall.

[0003] Currently, the mainstream type of sand control screen is the pre-filled screen. For example, patent CN215169914U discloses a pre-filled screen for small wells, including tubing and a layered structure fitted around the outer diameter of the tubing. The layered structure, from the inside out, includes a filter screen, a filling layer, and a screen cylinder. However, in this patent, the layered structure is fitted as a single unit around the tubing. In practical applications, there is a large gap between the innermost layer (i.e., the filter screen) and the outer wall of the tubing. Since the well size is fixed, the outer diameter of the pre-filled screen is also fixed. If there is a large gap between the filter screen and the outer wall of the tubing, the effective thickness of the filling layer will be reduced (the thickness of the filling layer on one side is only 4.25mm), resulting in a decrease in the sand-blocking medium capacity in the filling layer, thereby reducing the sand control effect. Utility Model Content

[0004] The present invention aims to provide a pre-filled sand-proof screen pipe and sand-proof system based on a straight-winding wire structure, so as to solve the problem that there is a large gap between the filter screen and the outer wall of the oil pipe in the existing pre-filled screen pipe, which leads to a reduction in the effective thickness of the filling layer.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a pre-filled sand screen pipe based on a straight-wound wire structure, including a straight-wound layer, an outer wire layer sleeved outside the straight-wound layer, and a pre-filled chamber located between the straight-wound layer and the outer wire layer. The pre-filled chamber is filled with pre-filled particles. The straight-wound layer includes a transverse steel wire and multiple longitudinal ribs. The multiple longitudinal ribs are arranged at intervals along the circumference to form a cylindrical structure. The transverse steel wire is spirally wound around the multiple longitudinal ribs with a constant pitch. There is a first pore between any two adjacent turns of the transverse steel wire.

[0006] As a limitation of this utility model: the pre-filled particles are ceramsite.

[0007] As another limitation of this utility model: the outer winding wire layer includes multiple reinforcing ribs and a transverse winding wire. The multiple reinforcing ribs are arranged at intervals along the circumference. The transverse winding wire is spirally wound around the multiple reinforcing ribs with a constant pitch and is fixedly connected to the reinforcing ribs. The multiple reinforcing ribs and the transverse winding wire form an integrated cylindrical structure. There is a second gap between any two adjacent turns of the transverse winding wire.

[0008] As a further limitation of this utility model: the transverse steel wire and the transverse winding have the same structure, and the cross section of the transverse steel wire is an isosceles trapezoid; the upper bottom of the transverse steel wire is set close to the longitudinal rib, and the upper bottom of the transverse winding is set close to the reinforcing rib.

[0009] As a further limitation of this utility model: the longitudinal ribs and the reinforcing ribs have the same structure, the cross section of the longitudinal ribs is an isosceles trapezoid, and the thickness of the longitudinal ribs is 1.8mm; the transverse steel wire is wound around the upper bottom of each longitudinal rib, and the transverse wire is wound around the upper bottom of each reinforcing rib.

[0010] As a further limitation of this utility model: both the transverse steel wire and the transverse winding wire are made of 316L stainless steel wire.

[0011] This utility model also provides a sand control system, including a pre-filled sand control screen pipe based on a straight winding wire structure, and a base pipe with several flow holes on the outer wall of the base pipe; multiple longitudinal ribs are fixedly fixed on the outer wall of the base pipe at intervals along the circumference of the base pipe, and the axial direction of the longitudinal ribs is parallel to the axial direction of the base pipe; the outer winding wire layer is fixedly connected to the base pipe by a connector.

[0012] As a further limitation of this utility model: the connector is an end ring, and there are two end rings, one at the top end and one at the bottom end of the outer winding wire layer. The end ring is fixedly sleeved on the outer wall of the base tube and its outer diameter is adapted to the diameter of the outer winding wire layer. The end ring is fixedly connected to the end of the outer winding wire layer.

[0013] As a further limitation of this utility model: the thickness of one side of the pre-filled chamber is 5mm.

[0014] As a further limitation of this utility model, a sleeve straightener is also fitted on the outer wall of the base tube.

[0015] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows: This invention provides a pre-filled sand-control screen pipe and sand-control system based on a straight-winding wire structure. Compared with the prior art, the straight-winding layer and the outer wire layer in this device are not a single unit. The straight-winding layer is a separate structure, comprising multiple longitudinal ribs and a transverse steel wire. The multiple longitudinal ribs are arranged at intervals along the circumference to form a cylindrical structure, and the transverse steel wire is spirally wound around the multiple longitudinal ribs with a constant pitch. In implementation, the longitudinal ribs are fixed to the outer wall of the base pipe by welding, with the axial direction of the longitudinal ribs parallel to the axial direction of the base pipe. Then, the transverse steel wire is spirally wound around the longitudinal ribs to complete the wire winding. This on-site winding method ensures that the transverse steel wire is close to the outer wall of the base pipe while maintaining the most basic flow clearance (the size of the flow clearance here refers to the size of the longitudinal ribs). Compared to the existing process of first manufacturing the integral screen sleeve and then fitting it onto the outer wall of the base pipe, this invention eliminates the large gap between the outer wall of the base pipe and the innermost layer of the existing screen sleeve, increases the effective thickness of the pre-filled chamber, thereby increasing the capacity of the pre-filled particles and improving the sand-proof effect.

[0016] In summary, this invention eliminates the large gap between the outer wall of the base pipe and the innermost layer of the existing screen sleeve, increases the effective thickness of the pre-filled chamber, thereby increasing the capacity of the pre-filled particles and improving the sand control effect. This invention is applicable to the oil and gas extraction industry and is used to achieve the sand control effect. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention (ceramsite not shown). Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle; Figure 3 This is a schematic diagram of the main structure of Embodiment 1 of this utility model; Figure 4 for Figure 3 Enlarged schematic diagram of part B; Figure 5 This is a side view of Embodiment 2 of the present invention. Figure 6 This is a three-dimensional structural diagram of Embodiment 2 of the present invention in cross-sectional view (ceramsite not shown). Figure 7 This is a first partial structural perspective view of Embodiment 2 of the present invention in cross-sectional view (ceramsite not shown). Figure 8 This is a partial perspective view of the second structure of Embodiment 2 of the present invention in cross-sectional view (ceramsite and end ring are not shown). Figure 9 This is a third partial structural perspective view of Embodiment 2 of the present invention in cross-sectional view; Figure 10 This is a schematic diagram of the main structure of the base tube, transverse steel wire, longitudinal ribs, reinforcing ribs and transverse winding wire in Embodiment 2 of this utility model.

[0019] In the diagram: 1-straight winding layer, 101-transverse steel wire, 102-longitudinal ribs, 103-first pore; 2-Outer winding layer, 21-Reinforcing ribs, 22-Transverse winding, 23-Second pore; 3-Pre-filled chamber, 31-ceramsite; 4-Base tube, 41-Flow hole; 5-End ring, 6-Casing centralizer. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and do not constitute a limitation thereof.

[0021] Example 1: Pre-filled sand screen pipe based on straight-wound wire structure like Figures 1-4 As shown, this embodiment includes a straight winding layer 1, an outer winding layer 2 sleeved outside the straight winding layer 1, and a pre-filled chamber 3 located between the straight winding layer 1 and the outer winding layer 2.

[0022] I. Straight-wound layer 1; like Figure 2 , 3 As shown, the straight-wound layer 1 includes a transverse steel wire 101 and multiple longitudinal ribs 102. The multiple longitudinal ribs 102 are arranged at intervals along the circumference to form a cylindrical structure. The transverse steel wire 101 is spirally wound around the multiple longitudinal ribs 102 with a constant pitch. A first gap 103 exists between any two adjacent turns of the transverse steel wire 101. (See also...) Figure 7 , 9 In this embodiment, the minimum width of the first hole 103 is 0.3±0.05mm. Here, the minimum width refers to the distance between the lower bases of the two transverse steel wires 101, that is, D1 is 0.3±0.05mm. It should be explained that for an isosceles trapezoid, the two parallel sides are called the bases of the trapezoid, of which the longer base is called the lower base and the shorter base is called the upper base.

[0023] The transverse steel wire 101 is made of AISI 316L stainless steel wire, which has good corrosion resistance.

[0024] like Figure 3 , 4As shown, in this embodiment, the longitudinal rib 102 has an isosceles trapezoidal cross-section, a thickness H of 1.8 mm, and a bottom base length L of 1.5 mm. A transverse steel wire 101 is wound around the top base of each longitudinal rib 102. Figure 7 As shown, the cross-section of the transverse steel wire 101 is also an isosceles trapezoid. The upper base of the transverse steel wire 101 is positioned close to the longitudinal rib 102, meaning that after the transverse steel wire 101 is wound, its upper base contacts the upper base of the longitudinal rib 102. Setting the transverse steel wire 101 as an isosceles trapezoid prevents clogging. Specifically, the produced sand solution flows along... Figure 5 The liquid flows in the direction of the middle arrow, passing sequentially through the outer winding layer 2, the pre-filled chamber 3, and the straight winding layer 1. The sand particles are blocked, and the liquid flows into the base pipe 4 for production. The produced sand liquid often contains silt, such as... Figure 7 As shown, in this embodiment, the size of the first pore 103 increases sequentially along the flow direction of the produced sand liquid, so that after the produced sand liquid flows into the first pore 103, the size of the first pore 103 gradually increases, providing sufficient flow space for the produced sand liquid and preventing the produced sand liquid from being blocked.

[0025] II. Outer winding layer 2; like Figure 2 , 3 As shown, the outer winding layer 2 includes multiple reinforcing ribs 21 and a transverse winding wire 22. The multiple reinforcing ribs 21 are arranged at intervals along the circumference. The transverse winding wire 22 is spirally wound around the multiple reinforcing ribs 21 with a constant pitch and is fixedly connected to the reinforcing ribs 21 by welding. The multiple reinforcing ribs 21 and the transverse winding wire 22 form an integral cylindrical structure. A second gap 23 exists between any two adjacent turns of the transverse winding wire 22. (See also...) Figure 7 In this embodiment, the second pore 23 has the same shape and size as the first pore 103, and the second pore 23 will not be described in detail here.

[0026] The transverse steel wire 101 has the same structure as the transverse winding 22, also being an isosceles trapezoid. The transverse winding 22 also uses AISI 316L stainless steel wire. The upper bottom of the transverse winding 22 is positioned close to the reinforcing rib 21. (See attached image) Figure 7 , 8 The transverse steel wire 101 is designed as an isosceles trapezoid to prevent blockage of the produced sand liquid. The longitudinal ribs 102 have the same structure as the reinforcing ribs 21 (i.e., the same shape and size), and the transverse winding wire 22 is wrapped around the upper base of each reinforcing rib 21, see [link to documentation]. Figure 7 , 8 That is, the upper bottom of the transverse winding 22 contacts the upper bottom of the reinforcing rib 21.

[0027] It should be further noted that the transverse steel wire 101 and multiple longitudinal ribs 102 in the straight winding layer 1 are not a single unit. In actual application, the transverse steel wire 101 needs to be wound onto the longitudinal ribs 102 on-site. The outer winding layer 2, however, is a single unit, with the transverse winding wire 22 wound around multiple reinforcing ribs 21 and welded to them. In use, this cylindrical structure of the outer winding layer 2 is directly fitted over the straight winding layer 1.

[0028] III. Pre-filled chamber 3; like Figure 2-4 As shown, after the outer winding layer 2 is fitted over the straight winding layer 1, a pre-filled chamber 3 is formed between the straight winding layer 1 and the outer winding layer 2. The pre-filled chamber 3 is filled with pre-filled particles. In this embodiment, the pre-filled particles are 20-40 mesh ceramsite 31. Ceramsite 31 has high sphericity, high roundness, and high resistance to compression. In addition, because ceramsite 31 has a regular shape and smooth surface, it can be more compact and uniformly packed after filling. Compared with existing gravel filling, ceramsite 31 can form filter channels with more uniform pore size after filling, thus improving the sand control effect.

[0029] Example 2 Sand Control System like Figure 5-10 As shown, this embodiment includes the pre-filled sand-proof screen pipe based on the straight-winding wire structure of Embodiment 1, and also includes a base pipe 4. Several flow holes 41 are provided on the outer wall of the base pipe 4. The structure of the base pipe 4 and the flow holes 41 is existing technology. Multiple longitudinal ribs 102 are fixedly fixed to the outer wall of the base pipe 4 at intervals along its circumference. In this embodiment, the multiple longitudinal ribs 102 are sequentially welded and fixed to the outer wall of the base pipe 4. After fixing, the axial direction of the longitudinal ribs 102 is parallel to the axial direction of the base pipe 4.

[0030] The outer winding layer 2 and the base tube 4 are fixedly connected by a connector. In this embodiment, the connector uses an existing end ring 5, such as... Figure 5 As shown, there are two end rings 5, one at the top end and one at the bottom end of the outer winding wire layer 2. The end rings 5 ​​are fixedly sleeved on the outer wall of the base tube 4. The outer diameter of the end rings 5 ​​is matched with the diameter of the outer winding wire layer 2. Here, matching means that the outer diameter of the end rings 5 ​​is close to the diameter of the outer winding wire layer 2, so as to ensure that the ends of the end rings 5 ​​and the outer winding wire layer 2 can be welded and fixed.

[0031] Furthermore, such as Figure 5 As shown, a casing centralizer 6 is also fitted onto the outer wall of the base pipe 4 to ensure that the base pipe 4 is centered in the wellbore. The structure and principle of the casing centralizer 6 are existing technologies and will not be described in detail in this embodiment.

[0032] The installation principle of this embodiment is as follows: Figure 7 , 10As shown, firstly, multiple longitudinal ribs 102 are welded and fixed sequentially along the circumference of the base tube 4. Then, a transverse steel wire 101 is wound around the longitudinal ribs 102 using equipment. Subsequently, the outer wire layer 2 is sleeved on the outside of the transverse steel wire 101. The bottom end ring 5 is sleeved on the base tube 4. After the bottom end ring 5 is welded and fixed to the ends of the base tube 4 and the outer wire layer 2 respectively, ceramic particles 31 are filled into the pre-filled chamber 3 from the top and compacted. Then, the top end ring 5 is sleeved on the base tube 4. The top end ring 5 is welded and fixed to the ends of the base tube 4 and the outer wire layer 2 respectively.

[0033] The sand control principle of this embodiment is: the sand-producing liquid flows along... Figure 5 The liquid flows in the direction of the middle arrow, passing through the outer winding layer 2, the pre-filled chamber 3, and the straight winding layer 1 in sequence. The sand particles are blocked, and the liquid flows into the base tube 4 for production.

[0034] In this embodiment, the straight winding layer 1 and the outer winding layer 2 are not a single unit. The straight winding layer 1 is a separate structure, with a transverse steel wire 101 spirally wound around the longitudinal rib 102 to complete the winding. This on-site winding method ensures that the transverse steel wire 101 is close to the outer wall of the base pipe 4, while still ensuring the most basic flow gap (the size of the flow gap here refers to the thickness H of the longitudinal rib 102 being 1.8mm). Compared with the existing process of first manufacturing an integral screen sleeve and then fitting the integral screen sleeve onto the outer wall of the base pipe 4, the advantages of this utility model are: First, it eliminates the large gap between the outer wall of the base pipe 4 and the innermost layer of the existing screen sleeve, increasing the effective thickness of the pre-filling chamber 3. In this embodiment, the single-sided thickness Z of the pre-filling chamber 3 is 5mm, thereby increasing the capacity of the pre-filling particles (i.e., ceramic particles 31) and improving the sand control effect. Second, this utility model has good overall tensile, torsional, and bending resistance, ensuring that this embodiment is not easily damaged when pulled out of or lowered into the well.

[0035] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pre-filled sand-proof screen pipe based on a straight-wound wire structure, characterized in that, It includes a straight winding layer, an outer winding layer wrapped around the straight winding layer, and a pre-filled chamber located between the straight winding layer and the outer winding layer. The pre-filled chamber is filled with pre-filled particles. The straight winding layer includes a transverse steel wire and multiple longitudinal ribs. The multiple longitudinal ribs are arranged at intervals along the circumference to form a cylindrical structure. The transverse steel wire is spirally wound around the multiple longitudinal ribs with a constant pitch. There is a first pore between any two adjacent turns of the transverse steel wire.

2. The pre-filled sand-proof screen pipe based on a straight-wound wire structure according to claim 1, characterized in that, The pre-filled particles are ceramsite.

3. The pre-filled sand-proof screen pipe based on a straight-wound wire structure according to claim 1 or 2, characterized in that, The outer winding layer includes multiple reinforcing ribs and a transverse winding wire. The multiple reinforcing ribs are arranged at intervals along the circumference. The transverse winding wire is spirally wound around the multiple reinforcing ribs with a constant pitch and is fixedly connected to the reinforcing ribs. The multiple reinforcing ribs and the transverse winding wire form an integrated cylindrical structure. There is a second pore between any two adjacent turns of the transverse winding wire.

4. The pre-filled sand-proof screen pipe based on a straight-wound wire structure according to claim 3, characterized in that, The transverse steel wire has the same structure as the transverse winding wire, and the cross-section of the transverse steel wire is an isosceles trapezoid. The upper bottom of the transverse steel wire is set close to the longitudinal rib, and the upper bottom of the transverse winding wire is set close to the reinforcing rib.

5. The pre-filled sand-proof screen pipe based on a straight-wound wire structure according to claim 4, characterized in that, The longitudinal ribs and reinforcing ribs have the same structure. The cross-section of the longitudinal ribs is an isosceles trapezoid, and the thickness of the longitudinal ribs is 1.8mm. Transverse steel wires are wrapped around the top of each longitudinal rib, and transverse wires are wrapped around the top of each reinforcing rib.

6. The pre-filled sand-proof screen pipe based on a straight-wound wire structure according to claim 5, characterized in that, Both the transverse steel wire and the transverse winding wire are made of 316L stainless steel wire.

7. A sand control system, characterized in that, The pre-filled sand screen pipe based on the straight winding wire structure according to any one of claims 1-6 further includes a base pipe, on the outer wall of which a plurality of flow holes are provided; multiple longitudinal ribs are fixedly fixed on the outer wall of the base pipe at intervals along the circumference of the base pipe, and the axial direction of the longitudinal ribs is parallel to the axial direction of the base pipe; the outer winding wire layer is fixedly connected to the base pipe by a connector.

8. The sand control system according to claim 7, characterized in that, The connector is an end ring, and there are two end rings, one at the top end and one at the bottom end of the outer winding wire layer. The end ring is fixedly sleeved on the outer wall of the base tube and its outer diameter is adapted to the diameter of the outer winding wire layer. The end ring is fixedly connected to the end of the outer winding wire layer.

9. The sand control system according to claim 8, characterized in that, The thickness of one side of the pre-filled chamber is 5mm.

10. The sand control system according to any one of claims 7-9, characterized in that, A sleeve straightener is also fitted on the outer wall of the base pipe.

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