Oil layer sand production control device

Abstract

The utility model provides an oil layer sand production prevention device which comprises a base pipe framework and a plurality of annular steel wires wound on the outer side of the base pipe framework, a liquid passing gap is formed between every two adjacent annular steel wires, a plurality of radial flow guide grooves are formed in the upper surface and the lower surface of each annular steel wire, and in the same annular steel wire, a plurality of radial flow guide grooves are formed in the upper surface and the lower surface of each annular steel wire. The radial flow guide grooves are aligned up and down; the depth of the radial flow guide grooves is smaller than the width of the liquid passing gaps, and the radial flow guide grooves are used for guiding fluid to the inner side of the annular steel wire. The oil layer sand production control device has the advantages of being scientific in design, not prone to blockage, long in service life and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction technology, specifically to a device for preventing sand production in oil reservoirs. Background Technology

[0002] During oil extraction, oil and water in oil wells carry solid particles and impurities, especially in loose sandstone formations where there are more. When these solid particles and impurities enter the oil extraction equipment, they can cause varying degrees of damage, thereby reducing oil production efficiency. Sand screens are metal tubing strings with a filtering structure that use physical barriers to intercept formation sand particles while allowing fluid to pass through, filtering out these solid particles and impurities.

[0003] Sand control screens come in various types, including wire-wound screens, slotted screens, metal wool screens, and pre-filled sand control screens. Wire-wound screens consist of a ring of steel wire wound around a base pipe skeleton, creating uniform gaps between the wires. Their advantages include high strength and good permeability, making them suitable for medium- to high-permeability formations. However, the gaps between the wires are easily clogged by fine sand or scale. Generally, a gravel layer is filled around the stainless steel wire to provide initial filtration of the sand particles, followed by secondary filtration by the wire-wound screen. However, this structure cannot completely prevent fine sand from moving around the screen, and over time, it can still clog the gaps between the wires.

[0004] In order to solve the above problems, people have been seeking an ideal technological solution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a scientifically designed, less prone to clogging, longer-lasting, and highly practical oil reservoir sand control device.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an oil reservoir sand control device, comprising a base pipe skeleton and several annular steel wires wound around the outside of the base pipe skeleton, with fluid passage gaps provided between adjacent annular steel wires, and multiple radial guide grooves formed on the upper and lower surfaces of each annular steel wire, with the radial guide grooves aligned vertically within the same annular steel wire; the depth of the radial guide grooves is less than the width of the fluid passage gaps, for guiding fluid to the inner side of the annular steel wires.

[0007] Beneficial effects: The radial guide channel widens the local size of the liquid passage gap. When a small amount of fine yarn enters the liquid passage gap, it is easily guided by the radial guide channel into the annular steel wire, thus achieving the unblocking function and making it less prone to clogging.

[0008] Based on the above, each of the radial guide grooves is provided with pinhole-shaped through holes, which extend along the axial direction of the base tube skeleton.

[0009] Beneficial effects: When the liquid passage gap is partially blocked, the fluid in this layer can pass through the pinhole-shaped through-hole and flow to the adjacent liquid passage gap, thereby reducing flow resistance and improving liquid passage efficiency.

[0010] Based on the above, the cross-section of the annular steel wire is a combination of an outer rectangular portion and an inner trapezoidal portion, with the narrow end of the inner trapezoidal portion facing inward.

[0011] Beneficial effects: The liquid-passing gap is narrow on the outside and wide on the inside. The outer side can ensure the filtration effect, and when the fluid passes through the outer rectangular part, the fluid flow resistance is reduced, thereby further increasing the flow rate.

[0012] Based on the above, the outer end of the radial guide groove does not penetrate the outer rectangular portion, the inner end of the radial guide groove extends out from the waist of the inner trapezoidal portion, and the radial guide groove is configured to gradually increase in depth and width from the outer end to the inner end.

[0013] Beneficial effects: The outer rectangular portion is intact without weakening its filtering effect. The radial guide channel gradually increases in depth and width from the outer end to the inner end, which can further enhance the unblocking function of the radial guide channel.

[0014] Based on the above, the radial guide grooves are staggered in two adjacent annular steel wires.

[0015] Beneficial effects: It can prevent the local size of the fluid passage gap from being too large, thus preventing larger fine sand particles from passing through and entering the wellbore, thereby reducing the filtration effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of the oil layer sand prevention and control device in this utility model.

[0017] Figure 2 This is a top view of the sand-prevention device for oil layer in this utility model.

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the annular steel wire in this utility model.

[0019] In the figure: 1. Base tube skeleton; 2. Annular steel wire; 3. Liquid passage gap; 4. Radial guide groove; 5. Pinhole-shaped through hole; 21. Outer rectangular part; 22. Inner trapezoidal part. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0021] like Figure 1-3As shown, an oil reservoir sand control device includes a base pipe skeleton 1 and several annular steel wires 2 wound around the outside of the base pipe skeleton 1. Fluid passage gaps 3 are provided between adjacent annular steel wires 2. Multiple radial guide grooves 4 are formed on the upper and lower surfaces of each annular steel wire 2. The radial guide grooves 4 are aligned vertically within the same annular steel wire 2. The depth of the radial guide grooves 4 is less than the width of the fluid passage gaps 2, so as to guide the fluid to the inside of the annular steel wire 2.

[0022] In practical use, the sand control device for oil formation is installed in the target area of ​​the oil well, and then a gravel layer is filled on the outside of the annular steel wire 2. The gravel layer plays a primary filtration role, and the annular steel wire 2 plays a secondary filtration role. When the fluid passage gap 3 is filtering, because the radial guide channel 4 widens the local size of the fluid passage gap 3, when a small amount of fine yarn enters the fluid passage gap 3, it is easily guided by the radial guide channel to the annular steel wire 2, realizing the unblocking function, thus making it less prone to clogging.

[0023] In addition, each of the radial guide channels 4 is provided with pinhole-shaped through holes 5. The pinhole-shaped through holes 5 extend along the axial direction of the base tube skeleton 1. The diameter of the pinhole-shaped through holes 5 can be set to be similar to the width of the liquid passage gap 2. When the liquid passage gap 3 is partially blocked, the fluid in this layer can pass through the pinhole-shaped through holes 5 and flow into the adjacent liquid passage gap 3, thereby reducing the flow resistance and improving the liquid passage efficiency.

[0024] To further improve the filtration effect, the cross-section of the annular steel wire 2 is a combination of an outer rectangular portion 21 and an inner trapezoidal portion 22, with the narrow end of the inner trapezoidal portion 22 facing inward. In this way, the liquid-passing gap 3 is narrow on the outside and wide on the inside, which can ensure the filtration effect on the outside. When the fluid passes through the outer rectangular portion 21, the fluid flow resistance is reduced, thereby further increasing the flow velocity.

[0025] To further improve the dredging effect, the outer end of the radial guide channel 4 does not penetrate the outer rectangular portion 21, and the inner end of the radial guide channel 4 extends from the waist of the inner trapezoidal portion 22. The radial guide channel 4 is designed to gradually increase in depth and width from the outer end to the inner end. This ensures that the outer side of the outer rectangular portion 21 remains intact without weakening its filtration effect. The gradual increase in depth and width of the radial guide channel 4 from the outer end to the inner end makes the fluid flow more smoothly.

[0026] To prevent larger fine sand particles from passing through, the radial guide grooves 4 are staggered in two adjacent annular steel wires 2. This prevents the local size of the liquid passage gap 3 from becoming too large, thus preventing larger fine sand particles from passing through and entering the wellbore, thereby reducing the filtration effect.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A device for preventing sand production in oil reservoirs, comprising a base pipe skeleton and a plurality of annular steel wires wound around the outside of the base pipe skeleton, wherein fluid-passing gaps are provided between adjacent annular steel wires, characterized in that: Multiple radial guide grooves are formed on the upper and lower surfaces of each annular steel wire. The radial guide grooves are aligned vertically within the same annular steel wire. The depth of the radial guide grooves is less than the width of the liquid-passing gap, which is used to guide the fluid to the inside of the annular steel wire.

2. The oil reservoir sand production prevention device according to claim 1, characterized in that: Each of the radial guide grooves is provided with a pinhole-shaped through hole, which extends along the axial direction of the base tube skeleton.

3. The oil reservoir sand production prevention device according to claim 1 or 2, characterized in that: The cross-section of the annular steel wire is a combination of an outer rectangular portion and an inner trapezoidal portion, with the narrow end of the inner trapezoidal portion facing inward.

4. The oil reservoir sand production prevention device according to claim 3, characterized in that: The outer end of the radial guide groove does not penetrate the outer rectangular portion, and the inner end of the radial guide groove extends out from the waist of the inner trapezoidal portion. The radial guide groove is designed to gradually increase in depth and width from the outer end to the inner end.

5. The oil reservoir sand production prevention device according to any one of claims 1, 2 and 4, characterized in that: In two adjacent annular steel wires, the radial guide grooves are arranged in a staggered manner.

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