A multi-stage regulating downhole inflow control valve

Abstract

The invention discloses a downhole inflow control valve with a multi-stage adjustment, comprising a sand screen, a sliding cylinder, an oil nozzle sleeve and a driver, wherein the driver is used for driving the sliding cylinder to reciprocate along its own axis, the sliding cylinder is located between the sand screen and the oil nozzle sleeve, the sand screen is covered with sieve holes, one of the oil nozzle sleeve and the sliding cylinder is provided with an oil inlet nozzle group evenly arranged around its own axis, and the other is provided with an oil inlet hole which can be connected with any oil inlet nozzle group, the oil on the outside of the sand screen passes through the sieve holes, the oil inlet nozzle group and the oil inlet hole into the inside of the oil nozzle sleeve to realize inflow; the sliding cylinder and the oil nozzle sleeve are connected by a cam mechanism, one of the sliding cylinder and the oil nozzle sleeve is fixed, and the other can rotate around its own axis, the inflow flow rate of each oil inlet nozzle group is different, and the cam mechanism is used for converting the linear motion of the sliding cylinder into the rotational motion of the sliding cylinder or the oil nozzle sleeve, so that the oil inlet hole is connected with different oil inlet nozzle groups to realize the control of the inflow flow rate.

Description

Technical Field

[0001] The invention relates to the field of screen tube well completion, and in particular to a downhole inflow control valve with multi-stage regulation. Background Art

[0002] Screen completion technology refers to the technology of installing screens in the wellbore, using underground pressure to allow oil and gas to enter the well naturally, while preventing sand from entering. In order to achieve refined control of the oil well production process and ultimately increase oil well production, it is necessary to monitor and control the oil layer production dynamics in real time according to the actual production situation of the oil well.

[0003] To do this, it is necessary to control the inflow rate through the screen into the well. Summary of the invention

[0004] The object of the present invention is to provide a downhole inflow control valve with multi-stage regulation to solve the technical problem of controlling the inflow flow rate during the screen tube completion process.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] A multi-stage regulating downhole inflow control valve, comprising: an outer layer structure, including a sand screen; an intermediate layer structure, including a slide cylinder; an inner layer structure, including an oil nozzle sleeve; a driver, used to drive the slide cylinder to reciprocate along its own axis; wherein the slide cylinder is located between the sand screen and the oil nozzle sleeve, the sand screen is covered with sieve holes, one of the oil nozzle sleeve and the slide cylinder is provided with an oil inlet nozzle group evenly arranged around its own axis, and the other is provided with an oil inlet hole capable of docking with any one of the oil inlet nozzle groups, The oil on the outside of the sand control screen tube passes through the screen holes, the oil inlet nozzle group and the oil inlet hole into the inner side of the oil nozzle sleeve to achieve inflow; the slide cylinder and the oil nozzle sleeve are connected by a cam mechanism, one of the slide cylinder and the oil nozzle sleeve is fixed, and the other can rotate around its own axis, and the inflow flow rate of each oil inlet nozzle group is different. The cam mechanism is used to convert the linear motion of the slide cylinder into the rotational motion of the slide cylinder or the oil nozzle sleeve, so that the oil inlet hole is connected with different oil inlet nozzle groups to achieve control of the inflow flow rate.

[0007] Furthermore, the oil inlet nozzle group includes: first oil nozzles arranged at equal intervals in the circumferential direction of the oil nozzle sleeve, and the diameter of the first oil nozzles gradually increases or decreases in the clockwise direction; the cam mechanism includes: a first cam groove and a second cam groove continuously formed on the oil nozzle sleeve along the circumferential direction of the oil nozzle sleeve, the projections of the first cam groove and the second cam groove on the cross section of the oil nozzle sleeve present a fan ring shape, the width of the first cam groove at one end facing away from the second cam groove gradually decreases to form a first internal angle end, and the second cam groove at one end facing away from the first cam groove The width of the end gradually decreases to form a second female angle end, a first male angle end facing the center of the second cam groove is formed between adjacent first cam grooves, and a second male angle end facing the center of the second cam groove is formed between adjacent first cam grooves; a cam follower is fixedly connected to the slide cylinder and slidably connected to the first cam groove or the second cam groove. The cam follower rotates around the circumferential direction of the oil nozzle sleeve during the process of moving from the first female angle end to the second female angle end or from the second female angle end to the first female angle end, so that the oil inlet hole is aligned with different first oil nozzles in turn.

[0008] In another embodiment, the oil inlet nozzle group includes: a first oil nozzle and a second oil nozzle arranged at equal intervals in the circumferential direction of the oil nozzle sleeve, the calibers of the first oil nozzle and the second oil nozzle gradually increase and gradually decrease in the clockwise direction, the first oil nozzle and the second oil nozzle are respectively located on two circumferential lines, and the distance between the two circumferential lines is equal to the axial movement distance of the slide cylinder; the cam mechanism includes: a first cam groove and a second cam groove continuously formed on the oil nozzle sleeve along the circumferential direction of the oil nozzle sleeve, the projections of the first cam groove and the second cam groove on the cross section of the oil nozzle sleeve present a fan ring shape, and the first cam groove faces away from the The width of one end of the second cam groove gradually decreases to form a first female angle end, the width of the end of the second cam groove facing away from the first cam groove gradually decreases to form a second female angle end, a first male angle end facing the center of the second cam groove is formed between adjacent first cam grooves, and a second male angle end facing the center of the second cam groove is formed between adjacent first cam grooves; a cam follower is fixedly connected to the slide cylinder and slidably connected to the first cam groove or the second cam groove, and the cam follower rotates around the circumferential direction of the oil nozzle sleeve during the process of moving from the first female angle end to the second female angle end or from the second female angle end to the first female angle end.

[0009] Further, projections of the first cam groove and the second cam groove on the longitudinal section of the nozzle sleeve are in the shape of a right triangle.

[0010] Furthermore, one end of the first cam groove and / or the second cam groove facing away from each other is connected with a positioning groove, and the positioning groove is a sliding groove parallel to the axis of the oil nozzle sleeve, and the positioning groove is clearance-matched with the cam follower.

[0011] Further, the cam follower is a pin.

[0012] Furthermore, the outer layer structure also includes an upper outer cylinder and a lower outer cylinder respectively connected to the two ends of the sand control screen pipe; the inner layer structure also includes an upper inner cylinder and a lower inner cylinder respectively connected to the two ends of the oil nozzle sleeve.

[0013] Furthermore, the intermediate layer structure also includes an upper piston and a lower piston respectively connected to the two ends of the slide cylinder, wherein the upper piston is slidably disposed in an upper hydraulic chamber formed between the upper outer cylinder and the upper inner cylinder, and the lower piston is slidably disposed in a lower hydraulic chamber formed between the lower outer cylinder and the lower inner cylinder.

[0014] Furthermore, the driver also includes: an upper joint, connected to the upper hydraulic chamber and located at one end of the upper hydraulic chamber away from the slide cylinder; a lower joint, connected to the lower hydraulic chamber and located at one end of the lower hydraulic chamber away from the slide cylinder; a hydraulic system, connecting the upper joint and the lower joint, for inputting and extracting hydraulic oil into and out of the upper hydraulic chamber and the lower hydraulic chamber respectively.

[0015] Furthermore, the sand control screen pipe is fully covered with screen holes.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] A downhole inflow control valve with multi-stage adjustment is provided. During each linear reciprocating motion of the slide cylinder driven by the driver, the cam mechanism drives the slide cylinder to rotate a certain angle relative to the nozzle sleeve, so that the oil inlet holes on the slide cylinder are aligned with the oil inlet nozzle groups of different diameters on the nozzle sleeve in sequence, thereby realizing the control of the inflow flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 A sectional view of a longitudinal section of an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of a cross section of an embodiment of the present invention;

[0021] Figure 3 is a structural diagram of a cam mechanism according to a first embodiment of the present invention;

[0022] Figure 4 is a structural diagram of a cam mechanism according to a second embodiment of the present invention;

[0023] The numbers in the figure represent the following:

[0024] 11-upper joint; 12-upper outer cylinder; 13-sand screen; 14-lower outer cylinder; 15-lower joint; 21-upper piston; 22-sliding cylinder; 23-lower piston; 24-oil inlet hole; 31-upper inner cylinder; 32-oil nozzle sleeve; 33-lower inner cylinder; 34-oil inlet nozzle group; 35-first oil nozzle; 36-second oil nozzle; 41-first cam groove; 42-first female angle end; 43-first male angle end; 44-second cam groove; 45-second female angle end; 46-second male angle end; 47-cam follower;

[0025] 48-Location slot. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] (First embodiment)

[0028] The following provides a multi-stage regulating downhole inflow control valve. Figure 1 A cross-sectional view of the longitudinal section of the inlet control valve is shown, combined with Figure 1 .

[0029] Downhole inflow control valve includes:

[0030] The outer structure includes an upper joint 11, an upper outer tube 12, a sand control screen 13, a lower outer tube 14 and a lower joint 15 which are connected in sequence;

[0031] The middle layer structure includes an upper piston 21, a slide cylinder 22, and a lower piston 23 connected in sequence;

[0032] The inner layer structure includes an upper inner cylinder 31, a nozzle sleeve 32, and a lower inner cylinder 33 which are connected in sequence;

[0033] in,

[0034] The slide tube 22 is located between the sand screen 13 and the oil nozzle sleeve 32. The sand screen 13 is covered with sieve holes. One of the oil nozzle sleeve 32 and the slide tube 22 is provided with an oil inlet nozzle group 34 evenly arranged around its axis, and the other is provided with an oil inlet hole 24 that can be docked with any oil inlet nozzle group 34. The oil on the outside of the sand screen 13 passes through the sieve holes, the oil inlet nozzle group 34 and the oil inlet hole 24 into the inside of the oil nozzle sleeve 32 to achieve inflow.

[0035] The upper piston 21 is located in the upper hydraulic chamber formed between the upper outer cylinder 12 and the upper inner cylinder 31. The upper joint 11 is used to input hydraulic oil between the upper outer cylinder 12 and the upper inner cylinder 31 so that the upper piston 21 pushes the slide cylinder 22 to move toward the lower joint 15.

[0036] The lower piston 23 is located in the lower hydraulic chamber formed between the lower outer cylinder 14 and the lower inner cylinder 33. The lower joint 15 is used to input hydraulic oil between the lower outer cylinder 14 and the lower inner cylinder 33 so that the lower piston 23 pushes the slide cylinder 22 to move toward the upper joint 11.

[0037] The slide 22 and the oil nozzle sleeve 32 are connected by a cam mechanism. One of the slide 22 and the oil nozzle sleeve 32 is fixed, and the other can rotate around its own axis. The inflow rate of each oil inlet nozzle group 34 is different. The cam mechanism is used to convert the linear motion of the slide 22 into the rotational motion of the slide 22 or the oil nozzle sleeve 32, so that the oil inlet hole 24 can be connected with different oil inlet nozzle groups 34 to achieve control of the inflow rate.

[0038] The hydraulic system connects the upper joint 11 and the lower joint 15, and inputs and extracts hydraulic oil into and from the upper hydraulic chamber and the lower hydraulic chamber respectively. The upper hydraulic chamber and the upper piston 21 are combined into a hydraulic cylinder that can only output thrust in one direction. The resetting of the upper piston 21 is achieved by the reverse thrust provided by another hydraulic cylinder composed of the lower hydraulic chamber and the lower piston 23.

[0039] By switching the direction of the hydraulic oil flowing into and out of the upper hydraulic chamber and the lower hydraulic chamber, the movement direction of the slide 22 can be controlled, and by repeatedly switching the direction of the hydraulic oil flowing into and out of the upper hydraulic chamber and the lower hydraulic chamber, the slide 22 can perform linear reciprocating motion.

[0040] Figure 2 The cross-sectional view of the inflow control valve is shown, and the cut-away portion includes the sand screen 13, the nozzle sleeve 32, and the slide 22. Figure 2 .

[0041] The oil inlet nozzle group 34 includes first oil nozzles 35 of different sizes arranged on the oil nozzle sleeve 32, and the oil inlet hole 24 is arranged on the slide 22. The cam mechanism rotates the slide 22 by a certain angle each time the slide 22 is pushed by the upper piston 21 and the lower piston 23 to reciprocate linearly. Figure 2 (a) Figure 2 (b) Figure 2 (c), the oil inlet holes 24 are aligned with the oil inlet nozzle groups 34 with gradually increasing diameters in sequence, so that the inflow flow rate is gradually increased.

[0042] Figure 3 A schematic diagram of a cam mechanism for connecting the nozzle sleeve 32 and the slide 22 is shown. The nozzle sleeve 32 and the slide 22 are not shown in the figure. Figure 3 .

[0043] The cam mechanism includes:

[0044] A first cam groove 41 and a second cam groove 44 are continuously formed on the nozzle sleeve 32 along the circumferential direction of the nozzle sleeve 32. The projections of the first cam groove 41 and the second cam groove 44 on the cross section of the nozzle sleeve 32 present a fan ring shape. The width of the end of the first cam groove 41 facing away from the second cam groove 44 gradually decreases to form a first female angle end 42. The width of the end of the second cam groove 44 facing away from the first cam groove 41 gradually decreases to form a second female angle end 45. A first male angle end 43 facing the center of the second cam groove 44 is formed between adjacent first cam grooves 41. A second male angle end 46 facing the center of the second cam groove 44 is formed between adjacent first cam grooves 41.

[0045] The cam follower 47 is fixedly connected to the slide 22 and slidably connected to the first cam groove 41 or the second cam groove 44. The cam follower 47 rotates around the circumferential direction of the oil nozzle sleeve 32 during the process of moving from the first internal angle end 42 to the second internal angle end 45 or from the second internal angle end 45 to the first internal angle end 42.

[0046] The oil inlet nozzle group 34 includes: first oil nozzles 35 arranged at equal intervals in the circumferential direction around the oil nozzle sleeve 32, and the diameters of the first oil nozzles 35 gradually increase or decrease in the clockwise direction.

[0047] Working principle of cam mechanism:

[0048] The first cam groove 41 and the second cam groove 44 are slide grooves formed on the inner wall of the oil nozzle sleeve 32. The two can be directly connected, or the two can be connected by an annular groove surrounding the axis of the oil nozzle sleeve 32. The slide 22 and the cam follower 47 move forward and backward in a straight line along the axis of the oil nozzle sleeve 32 under the push of the upper piston 21 and the lower piston 23. In the process of the cam follower 47 moving from the first cam groove 41 to the second cam groove 44 and then back to the first cam groove 41, the slide 22 completes a straight line forward and backward movement and rotates a certain angle, so that the oil inlet hole 24 is aligned with different oil inlet nozzle groups 34.

[0049] Preferably, the projection of the first cam groove 41 and the second cam groove 44 on the longitudinal section of the oil nozzle sleeve 32 presents a right triangle shape. This design reduces the width of the first cam groove 41 and the second cam groove 44, allowing more first cam grooves 41 and second cam grooves 44 to be arranged in the circumferential direction around the oil nozzle sleeve 32.

[0050] Preferably, the first cam groove 41 or the second cam groove 44 is connected to one end facing away from each other with a positioning groove 48, and the positioning groove 48 is a slide groove parallel to the axis of the oil nozzle sleeve 32, and the positioning groove 48 is clearance-matched with the cam follower 47. The design of the positioning groove 48 makes it difficult for the slide groove to rotate by itself when it does not perform a linear forward and backward movement, thereby avoiding the oil inlet hole 24 and the oil inlet nozzle group 34 from being misaligned with each other.

[0051] (Second embodiment)

[0052] The defect of the first embodiment is that the slide 22 must rotate one circle to return to its original position, which means that if the cam mechanism converts the linear forward and backward motion of the slide 22 into a clockwise rotation of the slide 22, and the diameter of the oil inlet nozzle group 34 gradually increases in the clockwise direction, the slide 22 must rotate nearly one circle clockwise to reduce the inflow flow rate.

[0053] In order to solve this problem, the second embodiment provides a cam mechanism different from that of the first embodiment, so that when the slide cylinder 22 rotates clockwise, the inflow flow rate can be reduced or increased.

[0054] Figure 4 The cam mechanism of the second embodiment is shown, combined with Figure 4 .

[0055] The cam mechanism includes:

[0056] A first cam groove 41 and a second cam groove 44 are continuously formed on the nozzle sleeve 32 along the circumferential direction of the nozzle sleeve 32. The projections of the first cam groove 41 and the second cam groove 44 on the cross section of the nozzle sleeve 32 present a fan ring shape. The width of the end of the first cam groove 41 facing away from the second cam groove 44 gradually decreases to form a first female angle end 42. The width of the end of the second cam groove 44 facing away from the first cam groove 41 gradually decreases to form a second female angle end 45. A first male angle end 43 facing the center of the second cam groove 44 is formed between adjacent first cam grooves 41. A second male angle end 46 facing the center of the second cam groove 44 is formed between adjacent first cam grooves 41.

[0057] The cam follower 47 is fixedly connected to the slide 22 and slidably connected to the first cam groove 41 or the second cam groove 44. The cam follower 47 rotates around the circumferential direction of the oil nozzle sleeve 32 during the process of moving from the first internal angle end 42 to the second internal angle end 45 or from the second internal angle end 45 to the first internal angle end 42;

[0058] The first cam groove 41 and the second cam groove 44 are both connected to a positioning groove 48 at one end facing away from each other;

[0059] The oil inlet nozzle group 34 includes: a first oil nozzle 35 and a second oil nozzle 36 arranged at equal intervals in the circumferential direction around the oil nozzle sleeve 32, and the diameters of the first oil nozzle 35 and the second oil nozzle 36 gradually increase and decrease in the clockwise direction, respectively. The first oil nozzle 35 and the second oil nozzle 36 are respectively located on two circumferential lines, and the distance between the two circumferential lines is equal to the axial movement distance of the slide cylinder 22, that is, the distance between the projections of the ends of the first positioning groove 48 and the second positioning groove 48 away from each other on the axis of the oil nozzle sleeve 32.

[0060] The second embodiment decomposes the one rotational motion of the slide 22 by its own advance and retreat into two rotational motions by advance and retreat. Figure 4 For example, when the cam follower 47 finally stops at Figure 4 When the cam follower 47 finally stops at the left side (i.e., one end of the nozzle sleeve 32), the slide cylinder 22 can increase the inflow flow rate by its own advance and retreat. Figure 4 When the slide cylinder 22 is on the right side (i.e. the other end of the nozzle sleeve 32), the slide cylinder 22 can reduce the inflow flow rate through each advance and retreat of the slide cylinder 22.

[0061] (Other things that need to be explained)

[0062] The cam follower 47 is a pin.

[0063] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A multi-stage regulating downhole inflow control valve, characterized in that: include: outer structure, including sand control screens; The middle layer structure includes a slide tube; The inner structure includes a nozzle sleeve; A driver, used for driving the slide cylinder to reciprocate along its axis; in, The slide tube is located between the sand control screen and the oil nozzle sleeve, the sand control screen is covered with sieve holes, the oil nozzle sleeve is provided with an oil inlet nozzle group evenly arranged around its own axis, the slide tube is provided with an oil inlet hole that can be docked with any one of the oil inlet nozzle groups, and the oil on the outside of the sand control screen passes through the sieve holes, the oil inlet nozzle group and the oil inlet hole into the inside of the oil nozzle sleeve to achieve inflow; The slide cylinder and the oil nozzle sleeve are connected by a cam mechanism, one of the slide cylinder and the oil nozzle sleeve is fixed, and the other can rotate around its own axis, and the inflow flow rate of each oil inlet nozzle group is different. The cam mechanism is used to convert the linear motion of the slide cylinder into the rotational motion of the slide cylinder or the oil nozzle sleeve, so that the oil inlet hole is connected with different oil inlet nozzle groups to achieve control of the inflow flow rate; The oil inlet nozzle group comprises: a first oil nozzle and a second oil nozzle which are arranged at equal intervals in the circumferential direction around the oil nozzle sleeve, the calibers of the first oil nozzle and the second oil nozzle are gradually increased and gradually decreased in the clockwise direction, the first oil nozzle and the second oil nozzle are respectively located on two circumferential lines, and the distance between the two circumferential lines is equal to the axial movement distance of the slide cylinder; The cam mechanism comprises: A first cam groove and a second cam groove are continuously formed on the oil nozzle sleeve along the circumferential direction of the oil nozzle sleeve, the projections of the first cam groove and the second cam groove on the cross section of the oil nozzle sleeve present a fan ring shape, the width of the first cam groove at one end facing away from the second cam groove gradually decreases to form a first female angle end, the width of the second cam groove at one end facing away from the first cam groove gradually decreases to form a second female angle end, a first male angle end facing the center of the second cam groove is formed between adjacent first cam grooves, and a second male angle end facing the center of the first cam groove is formed between adjacent second cam grooves; A cam follower is fixedly connected to the slide cylinder and slidably connected to the first cam groove or the second cam groove. The cam follower rotates around the circumferential direction of the oil nozzle sleeve when moving from the first internal angle end to the second internal angle end or from the second internal angle end to the first internal angle end.

2. A multi-stage regulating downhole inflow control valve according to claim 1, characterized in that: Projections of the first cam groove and the second cam groove on the longitudinal section of the nozzle sleeve are in the shape of a right triangle.

3. A multi-stage regulating downhole inflow control valve according to claim 2, characterized in that: The first cam groove and / or the second cam groove are connected to one end facing away from each other with a positioning groove, and the positioning groove is a sliding groove parallel to the axis of the oil nozzle sleeve, and the positioning groove is in clearance fit with the cam follower.

4. A multi-stage regulating downhole inflow control valve according to claim 3, characterized in that: The cam follower is a pin.

5. A multi-stage regulating downhole inflow control valve according to claim 1, characterized in that: The outer structure also includes an upper outer cylinder and a lower outer cylinder respectively connected to both ends of the sand control screen; The inner layer structure also includes an upper inner cylinder and a lower inner cylinder respectively connected to the two ends of the nozzle sleeve.

6. A multi-stage regulating downhole inflow control valve according to claim 5, characterized in that: The intermediate layer structure also includes an upper piston and a lower piston respectively connected to the two ends of the slide cylinder, wherein the upper piston is slidably disposed in an upper hydraulic chamber formed between the upper outer cylinder and the upper inner cylinder, and the lower piston is slidably disposed in a lower hydraulic chamber formed between the lower outer cylinder and the lower inner cylinder.

7. A multi-stage regulating downhole inflow control valve according to claim 6, characterized in that: The driver further comprises: An upper joint, connected to the upper hydraulic chamber and located at an end of the upper hydraulic chamber away from the slide cylinder; A lower joint connected to the lower hydraulic chamber and located at an end of the lower hydraulic chamber away from the slide cylinder; A hydraulic system is connected to the upper joint and the lower joint, and is used to input and extract hydraulic oil into and from the upper hydraulic chamber and the lower hydraulic chamber respectively.

8. A multi-stage regulating downhole inflow control valve according to claim 1, characterized in that: The sand control screen pipe is fully covered with screen holes.

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