Oil exploitation sand control pipe

Abstract

The invention relates to a sand control pipe for oil exploitation, which belongs to the technical field of oil exploitation equipment and comprises a screen pipe, a plurality of first screen holes spirally distributed in the axial direction are formed in the outer pipe wall of the screen pipe, and a plurality of second screen holes spirally distributed in the axial direction are formed in the inner pipe wall of the screen pipe. The multiple first screen holes and the multiple second screen holes are arranged in a one-to-one opposite mode, and the hole diameter of the multiple first screen holes is larger than that of the multiple second screen holes. According to the screen pipe, the first screen holes are formed in the outer pipe wall of the screen pipe, then the second screen holes are formed in the inner pipe wall of the screen pipe, the first screen holes and the second screen holes are oppositely arranged, and the hole diameter of the first screen holes is larger than that of the second screen holes, so that the processing difficulty of the screen pipe can be reduced, and the manufacturing cost of the screen pipe can be reduced; and coarse sand, medium sand, fine sand and silty sand can be blocked step by step, accurate and efficient sand prevention is achieved, and the service life of spun sand is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction equipment, and particularly relates to a sand control pipe for oil extraction. Background Art

[0002] Sand production in oil and gas wells is an important problem currently plaguing the exploitation of unconsolidated sandstone reservoirs. It not only easily causes sand burial of oil layers and pump jamming accidents, exacerbates the wear of surface and downhole equipment, but also can cause wellbore collapse in severe cases, resulting in casing damage and oil well abandonment.

[0003] Currently, the commonly used oil well sand control technologies at home and abroad are mainly divided into two categories: chemical sand control and mechanical sand control. The advantage of chemical sand control is that it does not affect the implementation of various operation measures, but the sand control strength and effective period are limited to a certain extent; mechanical sand control methods are commonly used in oil fields. Common mechanical sand control methods include filter sand pipes, wire-wound screen pipes, slotted screen pipes, gravel-packed screen pipes outside the pipe, expandable screen pipes, etc. Although these mechanical sand control methods all have certain advantages, most of them are difficult to be competent for the sand control tasks of oil wells with severe sand production in the middle and late stages or those that have undergone multiple sand control operations.

[0004] Therefore, how to design a sand control pipe for oil extraction with a simple structure, low cost, and high efficiency in sand control is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a sand control pipe for oil extraction, which solves the technical problem of limited sand control effect of existing sand control pipes for oil extraction.

[0006] The technical solution for the present invention to solve the above technical problems is as follows: A sand control pipe for oil extraction includes: a screen pipe, on the outer pipe wall of the screen pipe, there are provided a plurality of first screen holes spirally distributed along the axial direction, and on the inner pipe wall of the screen pipe, there are provided a plurality of second screen holes spirally distributed along the axial direction. The plurality of first screen holes and the plurality of second screen holes are respectively arranged in a one-to-one correspondence, and the apertures of the plurality of first screen holes are all larger than the apertures of the plurality of second screen holes.

[0007] The beneficial effect of the present invention is: By changing the structure of the traditional sand control pipe for oil extraction, first, a plurality of first screen holes are provided on the outer pipe wall of the screen pipe, and then a plurality of second screen holes are provided on the inner pipe wall of the screen pipe. Since the plurality of first screen holes and the plurality of second screen holes are arranged in a one-to-one correspondence and the apertures of the plurality of first screen holes are larger than the apertures of the plurality of second screen holes, it can not only reduce the processing difficulty of the screen pipe and the preparation cost of the screen pipe, but also block coarse sand, medium sand, fine sand, and silt step by step, realizing precise and efficient sand control and extending the sand control life.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Further, the axial direction of the first screen hole and the axial direction of the second screen hole arranged in a one-to-one correspondence form an included angle α.

[0010] Furthermore, the included angle α is 30 to 60°.

[0011] The beneficial effect of the above is: By arranging the axis of the first sieve holes at an included angle α with the axis of the relatively arranged second sieve holes, a bent structure sieve hole can be formed to effectively block coarse sand, medium sand, fine sand, and silt.

[0012] Furthermore, the diameters of the multiple first sieve holes are all 10 to 15 mm, and the diameters of the multiple second sieve holes are all 8 to 10 mm.

[0013] Furthermore, the screen pipe includes a fixed cylinder section, a lower screen cylinder section, and multiple upper screen cylinder sections. A fixed screw cylinder 6 is fixed at the bottom end of the fixed cylinder section; an internal lower thread is provided on the inner cylinder wall at the top end of the lower screen cylinder section; the multiple upper screen cylinder sections are arranged in sequence from top to bottom, and internal upper threads are provided on the inner cylinder walls at their top ends, and connecting screw cylinders are fixed at their bottom ends. The connecting screw cylinder of the upper screen cylinder section above is threadedly connected to the internal upper thread of the corresponding lower screen cylinder section below; the fixed screw cylinder 6 is threadedly connected to the internal upper thread of the uppermost upper screen cylinder section; the connecting screw cylinder of the lowermost upper screen cylinder section is threadedly connected to the internal lower thread of the lower screen cylinder section; the multiple first sieve holes are all provided on the outer cylinder walls of the lower screen cylinder section and the multiple lower screen cylinder sections; the multiple second sieve holes are all provided on the inner cylinder walls of the lower screen cylinder section and the multiple lower screen cylinder sections.

[0014] The beneficial effect of the above is: By dividing the screen pipe into a fixed cylinder section, a lower screen cylinder section, and multiple upper screen cylinder sections, since the fixed cylinder section, the lower screen cylinder section, and the multiple upper screen cylinder sections are threadedly connected through the fixed screw cylinder, the connecting screw cylinder, the internal upper thread, and the internal lower thread, they can be transported in sections and assembled on site, reducing the transportation difficulty and improving the practicability.

[0015] Furthermore, it further includes multiple locking bolts. Multiple circumferentially arranged threaded holes are provided on the fixed screw cylinder 6 and the multiple connecting screw cylinders; multiple counterbore holes are provided on the lower screen cylinder section and the multiple upper screen cylinder sections, and the multiple counterbore holes are respectively arranged in one-to-one correspondence with the multiple threaded holes; the multiple locking bolts respectively pass through the multiple counterbore holes and are threadedly connected into the corresponding threaded holes.

[0016] The beneficial effect of the above is: By using the multiple locking bolts to respectively pass through the multiple counterbore holes and be threadedly connected into the corresponding threaded holes, the connection strength between the fixed cylinder section, the lower screen cylinder section, and the multiple upper screen cylinder sections can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view assembly structure schematic diagram of a sand control pipe for oil extraction according to the present invention;

[0018] Figure 2 This is a schematic diagram of the split structure of a sand control pipe for oil production according to the present invention when viewed from above;

[0019] Figure 3 This is a schematic diagram of the front split structure of a petroleum production sand control pipe of the present invention;

[0020] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of an upper screen pipe in a petroleum production sand control pipe.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0022] 1. Screen tube, 11. First screen hole, 12. Second screen hole, 13. Fixed cylinder section, 14. Lower screen cylinder section, 15. Upper screen cylinder section, 16. Fixed screw cylinder, 17. Connecting screw cylinder, 18. Threaded hole, 19. Countersunk hole, 2. Locking bolt. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 4 As shown, a sand control pipe for oil production includes: a screen tube 1, a plurality of first screen holes 11 distributed along an axial spiral are arranged on the outer tube wall of the screen tube 1, and a plurality of second screen holes 12 distributed along an axial spiral are arranged on the inner tube wall thereof, the plurality of first screen holes 11 and the plurality of second screen holes 12 are arranged opposite to each other one by one, and the apertures of the plurality of first screen holes 11 are all larger than the apertures of the plurality of second screen holes 12.

[0025] like Figure 4 As shown, in some specific embodiments, the axial direction of the first sieve hole 11 and the axial direction of the oppositely arranged second sieve hole 12 are arranged at an angle α.

[0026] Specifically, the angle α may be 30 to 60 degrees.

[0027] Specifically, the apertures of the plurality of first sieve holes 11 may all be 10 to 15 mm, and the apertures of the plurality of second sieve holes 12 may all be 8 to 10 mm.

[0028] like Figure 1 , Figure 2 and Figure 3As shown, in some specific embodiments, the sieve tube 1 may include a fixed cylinder section 13, a lower sieve cylinder section 14, and a plurality of upper sieve cylinder sections 15. A fixed screw cylinder 16 is fixed to the bottom end of the fixed cylinder section 13; an inner thread is provided on the inner cylinder wall at the top end of the lower sieve cylinder section 14; the plurality of upper sieve cylinder sections 15 are arranged in sequence from top to bottom, and inner threads are provided on the inner cylinder walls at their top ends, and connection screw cylinders 17 are fixed to their bottom ends. The connection screw cylinder 17 of the upper sieve cylinder section 15 above is threadedly connected to the inner thread of the corresponding lower sieve cylinder section 14 below; the fixed screw cylinder 16 is threadedly connected to the inner thread of the uppermost upper sieve cylinder section 15; the connection screw cylinder 17 of the lowermost upper sieve cylinder section 15 is threadedly connected to the inner thread of the lower sieve cylinder section 14; a plurality of first sieve holes 11 are provided on the outer cylinder walls of the lower sieve cylinder section 14 and the plurality of lower sieve cylinder sections 14; a plurality of second sieve holes 12 are provided on the inner cylinder walls of the lower sieve cylinder section 14 and the plurality of lower sieve cylinder sections 14.

[0029] As Figure 2 and Figure 3 As shown, in some specific embodiments, it may further include a plurality of locking bolts 2. A plurality of circumferentially arranged threaded holes 18 are provided on the fixed screw cylinder 16 and the plurality of connection screw cylinders 17; a plurality of counterbore holes 19 are provided on the lower sieve cylinder section 14 and the plurality of upper sieve cylinder sections 15, and the plurality of counterbore holes 19 are respectively arranged opposite to the plurality of threaded holes 18 one by one; the plurality of locking bolts 2 respectively pass through the plurality of counterbore holes 19 and are threadedly connected to the corresponding threaded holes 18.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sand control pipe for oil production, characterized in that: include: A sieve tube (1), wherein a plurality of first sieve holes (11) distributed in an axial spiral are provided on an outer tube wall of the sieve tube (1), and a plurality of second sieve holes (12) distributed in an axial spiral are provided on an inner tube wall thereof, the plurality of first sieve holes (11) and the plurality of second sieve holes (12) are arranged opposite to each other one by one, and the apertures of the plurality of first sieve holes (11) are all larger than the apertures of the plurality of second sieve holes (12).

2. The oil production sand control pipe according to claim 1, characterized in that: The axial direction of the first sieve hole (11) and the axial direction of the second sieve hole (12) arranged opposite to each other are arranged at an angle α.

3. The oil production sand control pipe according to claim 2, characterized in that: The angle α is 30-60°.

4. The oil production sand control pipe according to claim 1, characterized in that: The apertures of the plurality of first sieve holes (11) are all between 10 and 15 mm, and the apertures of the plurality of second sieve holes (12) are all between 8 and 10 mm.

5. The oil production sand control pipe according to claim 1, characterized in that: The screen tube (1) comprises a fixed cylinder section (13), a lower screen cylinder section (14) and a plurality of upper screen cylinder sections (15); a fixed screw barrel (16) is fixed to the bottom end of the fixed cylinder section (13); a lower internal thread is provided on the inner cylinder wall at the top end of the lower screen cylinder section (14); the plurality of upper screen cylinder sections (15) are arranged in sequence from top to bottom and the inner cylinder walls at the top ends thereof are all provided with upper internal threads, and a connecting screw barrel (17) is fixed to the bottom ends thereof, and the connecting screw barrel (17) of the upper upper screen cylinder section (15) is threadedly connected to the corresponding lower screen cylinder section (15) at the bottom. (14); the fixing screw barrel (16) is threadedly connected to the upper internal thread of the upper sieve barrel section (15) at the top; the connecting screw barrel (17) of the lower sieve barrel section (15) is threadedly connected to the lower internal thread of the lower sieve barrel section (14); the plurality of the first sieve holes (11) are all arranged on the outer cylinder wall of the lower sieve barrel section (14) and the plurality of the lower sieve barrel sections (14); the plurality of the second sieve holes (12) are all arranged on the inner cylinder wall of the lower sieve barrel section (14) and the plurality of the lower sieve barrel sections (14).

6. The oil production sand control pipe according to claim 5, characterized in that: It also includes a plurality of locking bolts (2); the fixing screw barrel (16) and the plurality of connecting screw barrels (17) are each provided with a plurality of threaded holes (18) arranged along the circumferential direction; the lower screen barrel section (14) and the plurality of upper screen barrel sections (15) are each provided with a plurality of countersunk holes (19), and the plurality of countersunk holes (19) are respectively arranged one by one with respect to the plurality of threaded holes (18); and the plurality of locking bolts (2) respectively pass through the plurality of countersunk holes (19) and are threadedly connected in the corresponding threaded holes (18).

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