Sand control screen pipe capable of adjusting filtering precision

Abstract

The invention belongs to the technical field of oil and gas well sand control, and particularly relates to a sand control screen pipe capable of adjusting filtering precision. According to the specific technical scheme, the screen pipe comprises a screen pipe body and an adjusting screen pipe, the adjusting screen pipe is arranged on the periphery of the screen pipe body and coaxially arranged, the adjusting screen pipe comprises a first adjusting pipe and a second adjusting pipe, and the first adjusting pipe and the second adjusting pipe are coaxially arranged in a sleeving mode at intervals; a plurality of first through holes are formed in the circumferential side wall of the first adjusting pipe, a plurality of elastic adjusting parts are arranged on the circumferential side wall of the second adjusting pipe, and the elastic adjusting parts are matched with the first through holes; a control part is arranged on the side wall of the outer circumference of the screen pipe main body; when the screen pipe body moves in the axis direction of the screen pipe body, the control part extrudes the elastic adjusting part, the elastic adjusting part is close to / away from the first through hole, and therefore the filtering precision of the sand control screen pipe is improved / reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand control in oil and gas wells, and particularly relates to a sand control screen pipe with adjustable filtration precision. Background Art

[0002] When oil and gas wells are exploited, there is a phenomenon of formation sand production. The sand control screen pipe is the most important and widely used tool in sand control measures, thus avoiding the subsequent process equipment from being blocked by sand and gravel. Due to the different geological environments of oil and gas wells, the filtration precision of the sand control screen pipe is different.

[0003] The filtration precision of the existing sand control screen pipe is usually determined before leaving the factory. The sizes of the sand and gravel in multiple oil wells in the same oil and gas well are not completely unified. At this time, multiple sand control screen pipes with different filtration precisions are required, which will surely increase the management difficulty of the sunscreen screen pipe. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a sand control screen pipe with adjustable filtration precision, which can set the filtration precision of the sand control screen pipe in advance by rotating the screen pipe body according to specific requirements; or during the use process, the screen pipe body can also be rotated electrically to change the filtration precision of the sand control screen pipe.

[0005] To achieve the above invention purpose, the technical solution adopted by the present invention is: a sand control screen pipe with adjustable filtration precision, including a screen pipe body and an adjusting screen pipe. The adjusting screen pipe is arranged on the periphery of the screen pipe body and coaxially. The adjusting screen pipe includes a first adjusting pipe and a second adjusting pipe. The first adjusting pipe and the second adjusting pipe are coaxially and spacedly sleeved. A plurality of first through holes are arranged on the circumferential side wall of the first adjusting pipe. A plurality of elastic adjusting parts are arranged on the circumferential side wall of the second adjusting pipe. The elastic adjusting parts are adapted to the first through holes. A control part is arranged on the outer circumferential side wall of the screen pipe body. When the screen pipe body moves along its axis direction, the control part squeezes / releases the elastic adjusting parts, and the elastic adjusting parts approach / away from the first through holes, thereby increasing / decreasing the filtration precision of the sand control screen pipe.

[0006] Preferably, the first through hole is a frustum-shaped through hole, and the diameter of the first through hole gradually increases along the liquid flow direction. A second through hole adapted to the elastic adjusting part is arranged on the second adjusting pipe. The elastic adjusting part includes an elastic part main body. A spherical block is arranged on the side of the elastic part main body close to the first through hole. The spherical block is adapted to the first through hole. A wedge-shaped block is arranged on the side of the elastic part main body away from the spherical block.

[0007] Preferably, a spherical groove adapted to the spherical block is arranged on the side wall of the elastic part main body, and the spherical block is in rolling connection with the spherical groove.

[0008] Preferably, the control part is an annular pushing block, which is fixedly arranged on the outer circumferential side wall of the screen pipe body, and a wedge-shaped working surface adapted to the wedge block is arranged on the annular pushing block.

[0009] Preferably, a plurality of third through holes are arranged on the second adjusting pipe, and a plurality of fourth through holes are arranged on the screen pipe body, and the caliber of the third through hole is greater than or equal to the caliber of the fourth through hole.

[0010] Preferably, the caliber of the third through hole gradually increases along the liquid flow direction.

[0011] Preferably, the third through hole is a trapezoidal stepped hole.

[0012] Preferably, an annular blocking block is arranged on the inner circumferential side wall of the second adjusting pipe, and the annular blocking block corresponds to the second through hole and is used for limiting the moving position of the annular pushing block.

[0013] Preferably, the adjusting screen pipe further includes connecting ends, both ends of the first adjusting pipe and the second adjusting pipe are fixed through the connecting ends, internal threads are arranged on the inner circumferential side wall of the connecting ends, and external threads adapted to the internal threads are arranged on the outer circumferential side wall of the screen pipe body.

[0014] Preferably, the cavity between the first adjusting pipe and the second adjusting pipe is filled with a porous filtering material or a filter screen.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The screen pipe body, the second adjusting pipe and the first adjusting pipe are arranged in sequence from inside to outside. A plurality of first through holes are arranged on the circumferential side wall of the first adjusting pipe, and a plurality of second through holes corresponding to the first through holes are arranged on the circumferential side wall of the second adjusting pipe. An elastic part main body is fixedly arranged in the second through hole, and one end of the elastic part main body is a movable free end; a spherical block is movably arranged on one side of the elastic part main body, and a wedge block is fixedly arranged on the other side. An annular pushing block corresponding to the wedge block is arranged on the screen pipe body; by changing the position of the screen pipe body on the adjusting screen pipe, the annular pushing block squeezes or loosens the wedge block, the spherical block approaches or moves away from the first through hole, and the flow-through area of the first through hole is reduced or increased, so as to increase or decrease the filtering precision of the sand control screen pipe.

[0017] (2) By setting the first through-hole as a frustum-shaped through-hole and increasing the diameter of the first through-hole along the liquid flow direction, when the spherical block approaches or moves away from the first through-hole, due to the blocking effect of the spherical block, not only will the flow-through area of the first through-hole be reduced or increased, thereby changing the particle size of the sand passing through the first through-hole and changing the filtration accuracy of the sand control screen pipe; when the first through-hole is blocked, the control part is adjusted to move the spherical block away from the first through-hole. Along the liquid flow direction, the expansion rate of the first through-hole increases, and the sand will not accumulate at the first through-hole, achieving the self-cleaning effect of the sand control screen pipe.

[0018] (3) By setting the annular push block, not only can the wedge block be extruded, but also the mechanical strength of the screen pipe body can be improved. By setting the annular stop block, it is used to limit the moving position of the annular push block, so that each circle of the first through-hole, the elastic adjustment part, and the annular push block correspond. By setting the annular stop block, the mechanical strength of the second adjustment pipe can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall schematic diagram of the sand control screen pipe of the present invention (in the figure, the spherical block is fixedly connected to the main body of the elastic part);

[0020] Figure 2 is Figure 1 the schematic cross-sectional view taken along A-A in

[0021] Figure 3 is the schematic cross-sectional view of the sand control screen pipe of the present invention (in the figure, the spherical block is rollingly connected to the main body of the elastic part, and the case of the minimum filtration accuracy);

[0022] Figure 4 is the schematic cross-sectional view of the sand control screen pipe of the present invention (in the figure, the spherical block is rollingly connected to the main body of the elastic part, and the case of the maximum filtration accuracy);

[0023] Figure 5 is the partial structural schematic diagram of the second adjustment pipe of the present invention.

[0024] Reference signs in the drawings: the first adjustment pipe 1, the second adjustment pipe 2, the screen pipe body 3, the first through-hole 4, the third through-hole 5, the fourth through-hole 6, the spherical block 7, the main body of the elastic part 8, the wedge block 9, the second through-hole 10, the annular stop block 11, the annular push block 12, the spherical groove 13, the cavity 14, the connection end 15. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. If not specifically specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0027] As Figures 1-5 shown, the present invention discloses a sand control screen pipe with adjustable filtration precision, which includes a screen pipe main body 3 and an adjusting screen pipe. The adjusting screen pipe is arranged outside the screen pipe main body 3 and coaxially. The screen pipe main body 3 can move along the axis direction inside the adjusting screen pipe to adjust the filtration precision of the adjusting screen pipe, so as to change the filtration precision of the whole sand control screen pipe.

[0028] The adjusting screen pipe includes a first adjusting pipe 1 and a second adjusting pipe 2. The first adjusting pipe 1 and the second adjusting pipe 2 are coaxially arranged and sleeved at intervals. The first adjusting pipe 1 is arranged outside the second adjusting pipe 2. A plurality of first through holes 4 are arranged on the circumferential side wall of the first adjusting pipe 1, and a plurality of elastic adjusting parts are arranged on the circumferential side wall of the second adjusting pipe 2. The elastic adjusting parts are adapted to the first through holes 4. A control part is arranged on the outer circumferential side wall of the screen pipe main body 3, and the control part is adapted to the elastic adjusting parts. When the screen pipe main body 3 moves along its axis direction, the control part squeezes / releases the elastic adjusting parts, and the elastic adjusting parts approach / away from the first through holes 4, reducing / increasing the flow-through area of the first through holes 4, so as to increase / decrease the filtration precision of the sand control screen pipe.

[0029] In a preferred embodiment, multiple circles of first through holes 4 are equidistantly arranged on the circumferential side wall of the first adjusting pipe 1 along its axis direction, and a plurality of first through holes 4 are arranged in a circumferential array for each circle, which is convenient for the manufacture of the sand control screen pipe. Correspondingly, the arrangement mode of the plurality of elastic adjusting parts on the second adjusting pipe 2 is the same.

[0030] Further, the first through hole 4 is a frustum-shaped through hole, and the diameter of the first through hole 4 gradually increases along the liquid flow direction; a second through hole 10 adapted to the elastic adjustment part is provided on the second adjustment pipe 2, and the elastic adjustment part includes an elastic part main body 8. The shape, cross-sectional shape and size of the elastic part main body 8 are adapted to the second through hole 10. One end of the elastic part main body 8 is fixedly arranged on the inner side wall of the second through hole 10, and the other end of the elastic part main body 8 is a movable free end; a spherical block 7 is arranged on one side wall of the elastic part main body 8 close to the first through hole 4, and the spherical block 7 is adapted to the first through hole 4; a wedge-shaped block 9 is arranged on one side wall of the elastic part main body 8 away from the spherical block 7. When the control part presses or loosens the wedge-shaped block 9, the spherical block 7 approaches or moves away from the first through hole 4, reducing or increasing the flow area of the first through hole 4. It should be noted that when the control part loosens the wedge-shaped block 9, the elastic part main body 8 returns to its initial position under the action of its own elastic force, that is, the spherical block 7 moves away from the first through hole 4, and at this time, the first through hole 4 has the largest flow area.

[0031] It should be noted that the diameter of the spherical block 7 is larger than the minimum diameter of the first through hole 4 and smaller than the maximum diameter of the first through hole 4. By setting the first through hole 4 as a frustum-shaped through hole and the diameter of the first through hole 4 increasing along the liquid flow direction, and the spherical block 7 is arranged on the side with a larger diameter of the first through hole 4. When the spherical block 7 approaches or moves away from the first through hole 4, due to the blocking effect of the spherical block 7, not only will the flow area of the first through hole 4 be reduced or increased, thereby changing the particle size of the sand and gravel passing through the first through hole 4 and changing the filtration accuracy of the sand control screen pipe; when the first through hole 4 is blocked, the control part is adjusted to make the spherical block 7 move away from the first through hole 4. Along the liquid flow direction, the expansion rate of the first through hole 4 increases, and the sand and gravel will not accumulate at the first through hole 4, achieving the self-cleaning effect of the sand control screen pipe.

[0032] Further, the spherical block 7 and the elastic part main body 8 can be fixedly connected, such as Figure 1 、 2 shown; it can also be a movable connection method, such as Figure 3 、 4 shown. In order to prevent sand and gravel from getting stuck between the first through hole 4 and the spherical block 7, a spherical groove 13 adapted to the spherical block 7 is provided on the side wall of the elastic part main body 8, and the spherical block 7 is rotatably connected with the spherical groove 13, and the spherical block 7 can roll in the spherical groove 13, such as Figure 3 、 4As shown. When the gravel with low hardness gets stuck between the first through-hole 4 and the spherical block 7, under the pressure of the oil reservoir, it continuously pushes the gravel into the cavity 14 between the first adjusting pipe 1 and the second adjusting pipe 2, thereby driving the spherical block 7 to roll in the spherical groove 13. During the rolling process, the gravel flips forward in the first through-hole 4, and the spherical block 7 will squeeze and crush the gravel. After crushing the gravel with a large volume and low hardness, it is pushed into the cavity 14 to avoid blockage.

[0033] Furthermore, the cavity 14 between the first adjusting pipe 1 and the second adjusting pipe 2 is filled with a porous filtering material or a filter net. The porous filtering material and the filter net are used to further intercept the gravel and avoid the gravel from blocking the subsequent process equipment. Figures 1-4 The porous filtering material and the filter net are not shown.

[0034] Furthermore, a slope is provided on one side of the wedge-shaped block 9 close to the control part. The control part is an annular push block 12, and the annular push block 12 is fixedly arranged on the outer circumferential side wall of the screen pipe body 3. A wedge-shaped working surface adapted to the wedge-shaped block 9 is provided on the annular push block 12. The wedge-shaped working surface corresponds to the slope. When the screen pipe body 3 moves along its axial direction, the wedge-shaped working surface contacts the slope, and the annular push block 12 squeezes the wedge-shaped block 9. Due to the elastic action of the elastic part body 8, the spherical block 7 approaches the first through-hole 4, reducing the flow area of the first through-hole 4. By providing the annular push block 12, not only can the wedge-shaped block 9 be squeezed, but also the mechanical strength of the screen pipe body 3 can be improved. Moreover, internal threads are provided on the outer side walls at both ends of the screen pipe body 3, and external threads are provided on the inner side walls of the adjusting screen pipes. The screen pipe body 3 and the adjusting screen pipes are threadedly connected. By continuously rotating the screen pipe body 3, the position of the screen pipe body 3 in the adjusting screen pipe can be changed, thereby adjusting the relative position between the spherical block 7 and the first through-hole 4.

[0035] Furthermore, a plurality of third through-holes 5 are provided on the second adjusting pipe 2, and a plurality of fourth through-holes 6 are provided on the screen pipe body 3. The diameter of the third through-hole 5 is greater than or equal to the diameter of the fourth through-hole 6.

[0036] Furthermore, the diameter of the third through-hole 5 gradually increases along the liquid flow direction, and the expansion rate of the third through-hole 5 continuously increases, avoiding the gravel from blocking in the third through-hole 5. In a preferred embodiment, the third through-hole 5 is a trapezoidal stepped hole or a trapezoidal hole.

[0037] Furthermore, an annular stop block 11 is provided on the inner circumferential side wall of the second adjusting pipe 2. The annular stop block 11 corresponds to the second through-hole 10 and is used to limit the moving position of the annular push block 12, so that each circle of the first through-hole 4, the elastic adjusting part, and the annular push block 12 correspond. By providing the annular stop block 11, the mechanical strength of the second adjusting pipe 2 can also be improved.

[0038] Further, the adjustable sieve tube further includes a connecting end 15. Both ends of the first adjusting tube 1 and the second adjusting tube 2 are fixedly welded through the connecting end 15. An internal thread is provided on the inner circumferential side wall of the connecting end 15, and an external thread adapted to the internal thread is provided on the outer circumferential side wall of the sieve tube body 3.

[0039] The working principle of a sand control sieve tube with adjustable filtration accuracy: The sieve tube body 3, the second adjusting tube 2, and the first adjusting tube 1 are arranged in sequence from inside to outside. A number of first through holes 4 are provided on the circumferential side wall of the first adjusting tube 1, and a plurality of first through holes 4 are arranged in a circumferential array for each circle. A number of second through holes 10 corresponding to the first through holes 4 are provided on the circumferential side wall of the second adjusting tube 2. An elastic part main body 8 is fixedly arranged in the second through hole 10. One end of the elastic part main body 8 is a movable free end; a spherical block 7 is movably arranged on one side of the elastic part main body 8, and a wedge-shaped block 9 is fixedly arranged on the other side. The sieve tube body 3 is provided with an annular push block 12 corresponding to the wedge-shaped block 9; internal threads are provided on the outer side walls at both ends of the sieve tube body 3, and corresponding external threads are provided on the inner side walls at both ends of the adjusting sieve tube. The sieve tube body 3 and the adjusting sieve tube are threadedly connected. By rotating the sieve tube body 3, the position of the sieve tube body 3 in the adjusting sieve tube is changed. The annular push block 12 squeezes or releases the wedge-shaped block 9, and the spherical block 7 approaches or moves away from the first through hole 4, reducing or increasing the flow area of the first through hole 4, thereby increasing or decreasing the filtration accuracy of the sand control sieve tube.

[0040] The above-described embodiments are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, variations, modifications, and substitutions made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A sand control screen with adjustable filtration accuracy, characterized by: The invention comprises a screen tube body (3) and an adjusting screen tube, wherein the adjusting screen tube is arranged outside the screen tube body (3) and is coaxially arranged, and the adjusting screen tube comprises a first adjusting tube (1) and a second adjusting tube (2), wherein the first adjusting tube (1) and the second adjusting tube (2) are coaxially arranged and spaced apart from each other, a plurality of first through holes (4) are arranged on the circumferential side wall of the first adjusting tube (1), and a plurality of elastic adjusting parts are arranged on the circumferential side wall of the second adjusting tube (2), wherein the elastic adjusting parts are matched with the first through holes (4); a control part is arranged on the outer circumferential side wall of the screen tube body (3); when the screen tube body (3) moves along its axial direction, the control part squeezes / relaxes the elastic adjusting part, and the elastic adjusting part approaches / moves away from the first through hole (4), thereby increasing / decreasing the filtering accuracy of the sand control screen tube.

2. The sand control screen with adjustable filtration accuracy according to claim 1, characterized in that: The first through hole (4) is a truncated cone-shaped through hole, and the diameter of the first through hole (4) gradually increases along the flow direction of the liquid; the second regulating tube (2) is provided with a second through hole (10) adapted to the elastic regulating part, and the elastic regulating part comprises an elastic part body (8), and a spherical block (7) is provided on the side of the elastic part body (8) close to the first through hole (4), and the spherical block (7) is adapted to the first through hole (4); and a wedge block (9) is provided on the side of the elastic part body (8) away from the spherical block (7).

3. The sand control screen with adjustable filtration accuracy according to claim 2, characterized in that: A spherical groove (13) adapted to the spherical block (7) is provided on the side wall of the elastic part body (8), and the spherical block (7) is connected to the spherical groove (13) in a rolling manner.

4. The sand control screen with adjustable filtration accuracy according to claim 3, characterized in that: The control part is an annular push block (12), which is fixedly arranged on the outer circumferential side wall of the screen tube body (3), and is provided with a wedge-shaped working surface adapted to the wedge block (9).

5. The sand control screen with adjustable filtration accuracy according to claim 4, characterized in that: The second regulating pipe (2) is provided with a plurality of third through holes (5), the screen pipe body (3) is provided with a plurality of fourth through holes (6), and the caliber of the third through holes (5) is greater than or equal to the caliber of the fourth through holes (6).

6. The sand control screen with adjustable filtration accuracy according to claim 5, characterized in that: The diameter of the third through hole (5) gradually increases along the liquid flow direction.

7. The sand control screen with adjustable filtration accuracy according to claim 5, characterized in that: The third through hole (5) is a trapezoidal stepped hole.

8. The sand control screen with adjustable filtration accuracy according to claim 4, characterized in that: An annular stopper (11) is provided on the inner circumferential side wall of the second regulating tube (2), the annular stopper (11) corresponding to the second through hole (10) and used to limit the moving position of the annular push block (12).

9. The sand control screen with adjustable filtration accuracy according to claim 4, characterized in that: The regulating screen tube further comprises a connecting end (15), both ends of the first regulating tube (1) and the second regulating tube (2) are fixed by the connecting end (15), an internal thread is arranged on the inner circumferential side wall of the connecting end (15), and an external thread matching the internal thread is arranged on the outer circumferential side wall of the screen tube body (3).

10. The sand control screen with adjustable filtration accuracy according to claim 4, characterized in that: The cavity (14) between the first regulating tube (1) and the second regulating tube (2) is filled with porous filter material or filter mesh.

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