A reverse integrated sand control device for oil and gas wells

Abstract

This utility model discloses a reverse integrated sand control device for oil and gas wells, including a receiving cylinder and an inner sliding sleeve. A receiving ring is provided on the inner wall of the lower end of the receiving cylinder. The receiving cylinder has outer screen holes, and a sand-blasting hole is provided between the outer screen holes and the receiving ring. A ball seat is provided on the inner wall of the inner sliding sleeve, and an inner screen hole is provided above the ball seat. The inner sliding sleeve is connected to the inner wall of the receiving cylinder by a breakable connector. The inner sliding sleeve is located above the sand-blasting hole and blocks the outer screen hole. When the inner sliding sleeve sits on the receiving ring, the outer and inner screen holes are open, and the inner sliding sleeve closes the sand-blasting hole. This utility model forms a sand control device through a double-layer screen tube with outer and inner screen holes, suitable for sandstone formations with small median particle size and various oil and gas wells with high clay content.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically a reverse integrated sand control device for oil and gas wells. Background Technology

[0002] Sand production is a common problem in the development of loose sandstone oil reservoirs. It refers to the process or phenomenon in which the near-wellbore rock structure is damaged due to various factors such as oil and gas well development and operations, causing some of the detached formation sand to flow into the wellbore along with the oil fluid, thus causing a series of adverse effects on the normal production of oil and gas wells. Sand production can cause a series of hazards such as sand burying the oil layer, sand blocking the wellbore, abrasion of equipment, wellbore collapse, and casing damage.

[0003] As oilfield development deepens, changes in formation structure, increased sand production, and rising overall water cut all negatively impact the overall effectiveness and lifespan of sand control. This is particularly true in oilfields with well-developed bottom water reservoirs. Due to loose cementation, active bottom water, and high oil density in some areas, once bottom water connects and causes a cone-shaped formation, it becomes uncontrollable. Furthermore, the extremely loose cementation in loose sandstone reservoirs in Chinese oilfields leads to severe sand production formation gaps in wells, easily causing casing deformation and damage. Additionally, well conditions limit the application of chemical sand control technologies, making it impossible to plug the wells or resulting in incomplete plugging, thus restricting the application of effective sand control techniques.

[0004] The Shengli Oilfield suffers from severe heterogeneity and complex underground oil-water relationships, significantly increasing the difficulty of sand control technologies. This limits mechanical sand control, while chemical sand control cannot guarantee sufficient sand to fill and compact the formation, making it difficult to form a complete artificial wellbore, thus reducing the success rate of sand control and increasing its difficulty. Wells using mechanical sand control have a relatively long effective period, but production declines sharply with prolonged production.

[0005] Publication No. CN119593702A discloses an integrated reverse packing and cementing tubing string and its implementation method, comprising an outer tubing string and an inner tubing string. The outer tubing string includes, from bottom to top, a reverse packing sliding sleeve, a screen pipe, a sealing cylinder, an open hole packer, a positioning coupling, a cementing sliding sleeve, and a casing, all fixedly connected in sequence. The inner tubing string includes, from bottom to top, a reverse packing service tool, a flushing pipe, a rotary positioning tool, a cementing service tool, a pressure valve, and a drill pipe, all fixedly connected in sequence. The sealing cylinder is used to set the open hole packer, the positioning coupling is used to position the cementing service tool, the rotary positioning tool has two positions: positioning and passing, and the pressure valve is used to complete cementing pressure and circulating cement washing. By coordinating different positions of the inner and outer tubing strings, sand control and cementing operations can be completed in one trip, effectively saving operation time and costs. Sand control is performed before cementing, effectively preventing cement from contaminating the reservoir.

[0006] The existing technology has a different technical solution than this patent and cannot achieve the technical effect of this patent.

[0007] Publication No.: CN113958293A discloses a reverse-filling sand control tubing string and filling device, including an oil tubing string, a flushing string, and a sand control screen. The lower end of the oil tubing string is connected to a suspended packer, and the upper ends of the flushing string and the sand control screen are simultaneously connected to the suspended packer, with the flushing string located inside the sand control screen. It also includes an integrated reverse-filling gravel device, the upper end of which is simultaneously connected to the flushing string and the sand control screen.

[0008] The existing technology has a different technical solution than this patent and cannot achieve the technical effect of this patent.

[0009] Announcement No. CN203847077U discloses a ball-throwing type screen tube, including: a screen tube body with a flow channel connected at both ends; a protruding anti-reverse boss on the inner wall of the first end of the screen tube body; an anti-reverse groove and an anti-reverse cone smoothly connected to the anti-reverse groove on the inner wall of the second end of the screen tube body; and screen holes connected to the flow channel on the outer wall of the first end of the screen tube body; the screen tube also includes a sliding core, which is slidably installed in the flow channel and located between the anti-reverse boss and the anti-reverse cone; the screen tube also includes an anti-reverse ring, which is elastic and compressed and fitted onto the outer wall of the end of the sliding core near the anti-reverse cone to prevent the sliding core from sliding from the second end of the screen tube body to the first end of the screen tube body.

[0010] The existing technology only uses one layer of screen tube and does not have a sandblasting channel, so it cannot achieve the technical effect of this patent.

[0011] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0012] In order to overcome the shortcomings of the existing technology and solve at least one of the technical problems mentioned in the background technology, this utility model provides a reverse integrated oil and gas well sand control device.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] A reverse integrated sand control device for oil and gas wells includes a receiving cylinder and an inner sliding sleeve. A receiving ring is provided on the inner wall of the lower end of the receiving cylinder. The receiving cylinder has an outer screen hole, and a sandblasting hole is provided between the outer screen hole and the receiving ring. A ball seat is provided on the inner wall of the inner sliding sleeve, and an inner screen hole is provided above the ball seat. The inner sliding sleeve is connected to the inner wall of the receiving cylinder by a breakable connector. The inner sliding sleeve is located above the sandblasting hole and blocks the outer screen hole. When the inner sliding sleeve sits on the receiving ring, the outer screen hole and the inner screen hole are connected, and the inner sliding sleeve closes the sandblasting hole.

[0015] Furthermore, the receiving cylinder and the inner sliding sleeve are fitted with a sliding clearance, and the breakable connector is a shear pin.

[0016] Furthermore, the outer screen array configuration includes at least two rows of equidistantly distributed outer screen holes and at least two columns of uniformly distributed outer screen holes along the circumference of the receiving cylinder;

[0017] Specifically, the inner sieve array configuration includes at least two rows of equidistant inner sieve holes and at least two columns of inner sieve holes evenly distributed along the circumference of the inner sliding sleeve.

[0018] Furthermore, the outer sieve holes and the inner sieve holes are alternately arranged in the axial direction of the receiving cylinder;

[0019] Specifically, a screen hole sealing ring is provided between an adjacent row of outer screen holes and a row of inner screen holes on the inner wall of the receiving cylinder or the outer wall of the inner sliding sleeve.

[0020] Furthermore, the sandblasting hole array is configured such that the sandblasting holes are arranged in at least two rows and are equally spaced, and in at least two columns and are evenly distributed along the circumference of the receiving cylinder.

[0021] Furthermore, the outer sieve hole is a trapezoidal slit; the sandblasting hole of the receiving cylinder is a round hole; and the inner sieve hole is a trapezoidal round hole.

[0022] Furthermore, a sandblasting sealing ring is provided on the inner wall of the receiving cylinder between the sandblasting hole and the receiving ring, and between the sandblasting hole and the outer screen hole array, so that the inner sliding sleeve can seal the sand hole.

[0023] Furthermore, the outer wall of the inner sliding sleeve is provided with two sandblasting sealing rings below the inner screen hole array. When the inner sliding sleeve sits on the receiving ring, the sandblasting holes are located between the two sandblasting sealing rings.

[0024] Furthermore, the receiving cylinder is provided with a packer above the outer sieve hole.

[0025] Furthermore, the upper end of the receiving cylinder is connected to the return cylinder.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This utility model forms a sand-proof device by laser drilling of the inner sliding sleeve and laser cutting of the receiving cylinder into a trapezoidal slot in a double-layer screen tube. This makes the device have strong self-cleaning ability and is suitable for sand-proof completion of various oil and gas wells with small median particle size and high mud content.

[0028] 2. This utility model has high sand-proof capability, and can prevent fine sand, muddy sand and other substances, thereby increasing crude oil production. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a reverse integrated oil and gas well sand control device according to this utility model.

[0030] Figure 2 This is a schematic diagram of the structure of the receiving cylinder and inner sliding sleeve in this utility model.

[0031] Figure 3 This is a schematic diagram of the structure of the receiving cylinder in this utility model.

[0032] Figure 4 This is a schematic diagram of the inner sliding sleeve in this utility model.

[0033] Figure 5 This is a schematic diagram illustrating the production output of this utility model applied to gas wells.

[0034] Figure 6 This is a schematic diagram illustrating the production output of this utility model applied to oil wells.

[0035] Figure 7 This is a schematic diagram of the reconnection cylinder in this utility model.

[0036] Figure 8 This is a cross-sectional schematic diagram of the return tube in this utility model.

[0037] In the figure: 1. Receiving cylinder; 1-1. Receiving ring; 1-2. Outer screen array; 2. Sandblasting hole; 3. Sandproof screen pipe; 4. Inner sliding sleeve; 4-1. Ball seat; 4-2. Inner screen array; 5. Packer; 6. Return cylinder; 7. Casing; 8. Oil pipe; 9. Soluble ball. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Example 1:

[0040] Please see Figures 1 to 4This utility model provides a reverse integrated sand control device for oil and gas wells, comprising a receiving cylinder 1 and an inner sliding sleeve 4. A receiving ring 1-1 is provided on the inner wall of the lower end of the receiving cylinder 1. An outer screen hole array 1-2 is provided on the receiving cylinder 1, and sandblasting holes 2 are provided between the receiving ring 1-1 and the outer screen hole array 1-2. A ball seat 4-1 is provided on the inner wall of the inner sliding sleeve 4, and an inner screen hole array 4-2 is provided above the ball seat 4-1. The inner sliding sleeve 4 is connected to the inner wall of the receiving cylinder 1 by a breakable connector. The inner sliding sleeve 4 is located above the sandblasting holes 2 and blocks the outer screen hole array 1-2. When the inner sliding sleeve 4 sits on the receiving ring 1-1, the outer screen hole array 1-2 and the inner screen hole array 4-2 are connected, and the inner sliding sleeve 4 closes the sandblasting holes 2. During use, wear mainly occurs in the outer screen holes, extending the service life of the inner screen holes and ensuring the sand control effect.

[0041] Reverse drilling refers to drilling with the lower end of the tubing string below the lower boundary of the oil layer. During drilling, the well fluid enters from the tubing and from the tubing casing annular space upwards into the oil layer. Sand and plugging agent are pushed inwards from the bottom of the oil layer under the action of gravity and thrust. This allows more material to enter and go further, and can increase production.

[0042] Specifically, the receiving cylinder 1 and the inner sliding sleeve 4 are fitted with a sliding clearance, and the breakable connector is a shear pin.

[0043] Specifically, the outer screen array 1-2 includes at least two rows of equidistantly distributed outer screen holes and at least two columns of uniformly distributed outer screen holes along the circumference of the receiving cylinder 1, and the inner screen array 4-2 includes at least two rows of equidistantly distributed inner screen holes and at least two columns of uniformly distributed inner screen holes along the circumference of the inner sliding sleeve 4.

[0044] Specifically, the outer and inner screen holes are alternately arranged in the axial direction of the receiving cylinder 1, and a screen hole sealing ring is provided between an adjacent row of outer screen holes and a row of inner screen holes on the inner wall of the receiving cylinder 1 or the outer wall of the inner sliding sleeve 4 to ensure the sealing performance of the inner sliding sleeve 4.

[0045] Specifically, a sandblasting sealing ring is provided on the inner wall of the receiving cylinder 1 between the sandblasting hole 2 and the receiving ring 1-1, and between the sandblasting hole 2 and the outer screen hole array 1-2, so that the inner sliding sleeve 4 can seal the sand hole 2. Alternatively, two sandblasting sealing rings are provided on the outer wall of the inner sliding sleeve 4 below the inner screen hole array 4-2. When the inner sliding sleeve 4 sits on the receiving ring 1-1, the sandblasting hole 2 is located between the two sandblasting sealing rings.

[0046] Preferably, the sieve hole sealing ring and the sandblasting sealing ring are vulcanized sealing rings.

[0047] Specifically, the sandblasting holes 2 are arranged in an array, with at least two rows of sandblasting holes 2 that are equidistantly distributed and at least two columns that are evenly distributed along the circumference of the receiving cylinder 1.

[0048] Furthermore, the receiving cylinder 1 is provided with a packer 5 above the outer screen array 1-2.

[0049] Specifically, the packer 5 is a Y341 packer, which can be repeatedly set by pressing and releasing. The receiving cylinder 1 is connected to the upper and lower joints of the packer 5 by means of sections.

[0050] Furthermore, the inner wall of the upper end of the receiving cylinder 1 is threadedly connected to the return cylinder 6, which is used for reconnection via the oil pipe 8 during construction.

[0051] Specifically, such as Figure 7-8 As shown, the return tube 6 is a J-type return tube, which is existing technology and will not be described in detail.

[0052] Example 2:

[0053] Based on Example 1, in this example:

[0054] The outer sieve hole of the receiving cylinder 1 is made by laser cutting. The cutting is a trapezoidal slit, which is narrow on the outside and wide on the inside. The optimal value of the outer slit width is 0.20mm, the optimal value of the inner slit width is 0.30mm, and the optimal value of the slit length is 20mm.

[0055] The sandblasting hole 2 of the receiving cylinder 1 is a round hole with a diameter of 10mm.

[0056] The inner screen hole of the inner sliding sleeve 4 is laser-drilled. The inner screen hole is a trapezoidal hole, smaller on the outside and larger on the inside. The outer diameter of the inner screen hole is 0.3 mm and the inner diameter is 0.4 mm.

[0057] Trapezoidal fractures and trapezoidal holes have strong self-cleaning capabilities and are suitable for sand control and well completion in various oil and gas wells with small median grain size and high clay content.

[0058] During well construction, the outer and inner screen holes were blocked. When the construction was completed, a ball was thrown to pressurize the well, causing the inner sliding sleeve 4 to move down and the outer and inner screen holes to be directly connected, thus sealing the sandblasting hole 2.

[0059] The receiving cylinder 1 is 4 meters long, with an outer diameter of 89 mm and an inner diameter of 63 mm. The material is JN80. The outer screen array 1-2 is 1000 mm long, with an axial spacing of 100 mm between the outer screen holes and 12 rows of outer screen holes. The sandblasting hole array 2 is 1000 mm long, with an axial spacing of 100 mm between the sandblasting holes and 6 rows of sandblasting holes.

[0060] The inner sliding sleeve 4 has an outer diameter of Φ63mm, a thickness of 5mm, and is made of JN80 material; the inner sieve array 4-2 has a length of 1000mm, an axial spacing of 100mm between the inner sieve holes, and 12 rows of inner sieve holes.

[0061] Casing 7 is the oil well casing.

[0062] In this embodiment, the compressive strength is 45.6% of that of sleeve 7.

[0063] High temperature corrosion resistance: pH 2~12 at 350℃;

[0064] Sand control particle size: 0.2mm or larger.

[0065] Example 3:

[0066] Based on Example 1, this example provides an implementation process of a reverse integrated oil and gas well sand control device in a certain oil well. The process is described step by step according to the actual operation flow, covering key links and technical requirements, including the following steps:

[0067] S1. Preparations before construction;

[0068] S101. Data collection and analysis;

[0069] Collect well history data (well depth, casing size, producing layer thickness, sand production history, etc.).

[0070] Analyze the grain size (D10, D50, D90) of the core sand samples to determine the accuracy of the outer sieve array 1-2 and the inner sieve array 4-2 (usually 2-3 times that of D50).

[0071] Assess formation fluid properties (H2S, CO2 content, Cl⁻ concentration) to select corrosion-resistant materials.

[0072] S102. Preparation of tools and materials;

[0073] Sand filter pipe assembly: reverse integrated oil and gas well sand control device, packer 5, return sleeve 6.

[0074] Auxiliary tools: straighteners (rigid / elastic).

[0075] Cleaning fluid: solid-free brine (density 1.05-1.20 g / cm³) or acid (for calcareous cemented formations).

[0076] S2, Wellbore pretreatment process;

[0077] S201. Well cleaning and scraping;

[0078] Use a wellbore gauge (2-4 mm larger in diameter than the inner diameter of casing 7) to reach the bottom of the producing formation and verify the wellbore patency.

[0079] Mechanical scraper removes residual cement and hard deposits from the inner wall of casing 7 (rotation speed 30-60 rpm, circulation flow rate 0.5 m³ / min).

[0080] S202. Wellbore cleaning;

[0081] High-pressure cyclone flushing: Pump in cleaning fluid (discharge rate 1.0-1.5 m³ / min), flushing time ≥ 2 hours.

[0082] Acid unblocking (optional): For mud contamination layers, inject a mixed acid solution of 15% HCl + 3% HF (dosage 0.5 m³ / m production layer).

[0083] S203. Wellbore integrity test;

[0084] Pressure testing verified that the casing was leak-free (pressure was 80% of the formation fracture pressure, and pressure drop was ≤0.5MPa after stabilizing for 30 minutes).

[0085] S3, Filter Tube Installation Process

[0086] S301. Tube and string assembly;

[0087] Bottom-up: Reverse integrated oil and gas well sand control device, packer 5, return tube 6.

[0088] Special requirements for horizontal wells: The filter pipe is equipped with a rigid centralizer to ensure a centering accuracy of >85%.

[0089] S302. Lower pipe control;

[0090] Lowering speed: vertical section ≤30m / min, directional section ≤15m / min, horizontal section ≤10m / min.

[0091] Real-time monitoring of ECD (equivalent cyclic density) with fluctuation range ≤ ±0.02 g / cm³ prevents formation leakage.

[0092] Handling obstruction: Raise the tubing string 2-3m, circulate and flush the well, and then slowly lower it back down.

[0093] S303. Positioning and Sealing;

[0094] Confirm that the filter pipe is aligned with the producing layer using radioactive markers or a depth counter (error <0.5m).

[0095] Hydraulic setting packer 5 (pressure 15-20MPa, pressure stabilized for 5 minutes).

[0096] S4. Gravel backfilling process;

[0097] S401. Filling preparation;

[0098] Gravel selection: The particle size should be 5-6 times that of the formation sand D50 (for example, if the formation sand D50 is 0.1 mm, select gravel with a size of 0.5-0.6 mm).

[0099] Mortar preparation: sand ratio 20-30%, and sand-carrying liquid is hydroxypropyl guar gum solution with a viscosity of 50-80 cP.

[0100] S402. Squeeze filling;

[0101] Low displacement stage: Pump the preflush fluid at 0.3 - 0.5 m³ / min to fill the annulus.

[0102] High sand ratio stage: Increase the displacement to 0.8 - 1.2 m³ / min and pump the slurry until the filling pressure suddenly rises (pressure increase ≤ 5 MPa).

[0103] Displacement stage: Displace the remaining slurry with the clean fluid, and the displacement volume ≥ 1.2 times the annulus volume.

[0104] S403. Seal the sandblasting holes 2, open the outer and inner screen holes;

[0105] After the displacement is completed, drop the soluble ball 9, apply pressure to drive the inner sliding sleeve 4 to move downward to seal the sandblasting holes 2, and at the same time, the outer and inner screen holes are aligned and conduct.

[0106] S404. Verification of filling effect

[0107] Gamma ray logging: Compare the radioactive intensity before and after filling and calculate the filling rate (target > 90%).

[0108] Pressure test: Pressurize the annulus to 10 MPa, and the pressure drop ≤ 0.3 MPa in 5 minutes is qualified.

[0109] S5. Completion and production start-up procedures;

[0110] S501. Fluid displacement and flow induction;

[0111] Replace the kill fluid in the wellbore with filtered brine (solid content < 50 mg / L) to prevent the filter screen from being blocked.

[0112] Use nitrogen gas lift to induce flow, control the backflow rate ≤ 3 m³ / h to avoid formation fluid sanding due to formation agitation.

[0113] S502. Pressure-controlled production;

[0114] The initial production is 30% of the design value (for example, if the designed daily production is 100 m³, the production limit on the first day is 30 m³).

[0115] Increase the production by 10% every 24 hours until the normal production is reached, and monitor the sand content throughout the process (threshold < 0.03%). <C

[0116] S503. Dynamic monitoring and maintenance;

[0117] Install a downhole pressure / thermometer (PTG) to monitor the production pressure difference in real time (give an early warning when ΔP > 2 MPa).

[0118] Backwash the well once every 3 months (pump in clean water, pressure 8 - 10 MPa, displacement 0.5 m³ / min).

[0119] Applications in gas wells:

[0120] like Figure 5 As shown, KD34A-1 is a forward completion, while KD34A-2 and KD34A-4 are reverse completions. Under the same gas layer, reverse completion can maintain high and stable production, increasing daily gas production by 30%.

[0121] Applications on oil wells:

[0122] like Figure 6 As shown, compared with forward completion in the same oil layer, reverse completion has higher overall production indicators.

[0123] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0124] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0125] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0126] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0127] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A reverse integration sand control device for oil and gas wells, comprising a receiving cylinder, an inner sliding sleeve, characterized in that, The receiving cylinder is provided with a receiving ring on the inner wall at the lower end, the receiving cylinder is provided with an outer screen hole, and the receiving cylinder is provided with a sandblasting hole between the outer screen hole and the receiving ring. The inner wall of the inner sliding sleeve is provided with a ball seat, and the inner sliding sleeve is provided with an inner screen hole above the ball seat. The inner sliding sleeve is connected to the inner wall of the receiving cylinder by a breakable connector. The inner sliding sleeve is located above the sandblasting hole and the inner sliding sleeve blocks the outer screen hole. When the inner sliding sleeve sits on the receiving ring, the outer and inner screen holes are connected, and the inner sliding sleeve closes the sandblasting holes.

2. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The receiving cylinder and the inner sliding sleeve are fitted with a sliding clearance, and the breakable connector is a shear pin.

3. The reverse integrated oil and gas well sand control device according to claim 1, characterized in that, The outer screen array includes at least two rows of equidistantly distributed outer screen holes and at least two columns of uniformly distributed outer screen holes along the circumference of the receiving cylinder. The inner sieve array configuration includes at least two rows of equidistant inner sieve holes and at least two columns of inner sieve holes evenly distributed along the circumference of the inner sliding sleeve.

4. The reverse integrated oil and gas well sand control device according to claim 3, characterized in that, The outer and inner sieve holes are alternately arranged in the axial direction of the receiving cylinder; A screen hole sealing ring is provided between an adjacent row of outer screen holes and a row of inner screen holes on the inner wall of the receiving cylinder or the outer wall of the inner sliding sleeve.

5. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The sandblasting hole array is configured such that the sandblasting holes are arranged in at least two rows and are equally spaced, and in at least two columns and are evenly distributed along the circumference of the receiving cylinder.

6. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The outer sieve hole is a trapezoidal slit; the sandblasting hole of the receiving cylinder is a round hole; the inner sieve hole is a trapezoidal round hole.

7. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The inner wall of the receiving cylinder is provided with a sandblasting sealing ring between the sandblasting hole and the receiving ring, and between the sandblasting hole and the outer screen hole array, so that the inner sliding sleeve can seal the sand hole.

8. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The outer wall of the inner sliding sleeve is provided with two sandblasting sealing rings below the inner screen hole array. When the inner sliding sleeve sits on the receiving ring, the sandblasting holes are located between the two sandblasting sealing rings.

9. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The receiving cylinder has a packer installed above the outer sieve holes.

10. The reverse integration sand control device for oil and gas wells according to claim 1, characterized in that, The upper end of the receiving cylinder is connected to the return cylinder.

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