Separate injection and profile control integrated tubular column

Abstract

The utility model relates to the technical field of oil well water injection exploitation, in particular to a separate injection and profile control integrated pipe column. The separate injection and profile control integrated pipe column comprises a casing pipe, a Christmas tree is installed at the top end of the casing pipe arranged in an oil well, the bottom end of the Christmas tree communicates with an oil pipe inserted into the casing pipe, and the bottom end of the oil pipe is sequentially provided with a one-way valve, a screen pipe and a plugging head from top to bottom; the multiple profile control assemblies are installed on the oil pipe at equal intervals, packers are installed on the portions, located on the upper sides of the multiple profile control assemblies, of the oil pipe, water distributors are installed on the portions, located on the lower sides of the multiple profile control assemblies, of the oil pipe, each profile control assembly comprises an outer cylinder, and an inner cylinder is slidably installed in the outer cylinder; a profile control liquid hole I is formed in the inner cylinder body, and a profile control liquid hole II is formed in the outer cylinder body; and a profile control core used for regulating and controlling the first profile control liquid hole and the second profile control liquid hole to be aligned and communicated is movably mounted in the inner cylinder. The separated injection and profile control integrated pipe column has the advantage that separated injection and profile control operation is convenient, fast and efficient.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well water injection and exploitation, in particular to an integrated pipe string for injection and profile control. Background Art

[0002] The integrated pipe for stratified water injection and profile control is a downhole tool used for oilfield water injection development. It integrates the functions of stratified water injection and profile control into one pipe string system, and is mainly used to improve the effect of oilfield water injection development.

[0003] Publication number CN 108999590 B discloses a profile control tool, an integrated injection and profile control string, and a process. The profile control device comprises an outer tube, and an inner tube located within the outer tube and movable along the outer tube axis; a first profile control liquid channel and a second profile control liquid channel are respectively provided on the walls of the outer tube and the inner tube; the profile control core comprises a valve body; a third profile control liquid channel and a fourth profile control liquid channel are respectively provided on the upper and middle parts of the valve body; in the initial state, the first profile control liquid channel and the second profile control liquid channel are staggered; when the valve body enters the inner tube from bottom to top and the profile control liquid enters the valve body, the inner tube can move downward to connect the first profile control liquid channel, the second profile control liquid channel, and the fourth profile control liquid channel; when the profile control operation is completed, the first profile control liquid channel and the second profile control liquid channel can be restored to their staggered state. The profile control device is placed in a stratified water injection string and, in conjunction with the profile control core, can achieve the transition between water injection and profile control operations without moving the string.

[0004] During its specific use, when adjusting the profile, the profile adjusting core needs to be lifted from the bottom of the oil pipe to the top by equipment each time to open the profile adjusting channel. In this way, when adjusting the profile, the profile can only be adjusted from the bottom to the top along the oil pipe, with a single direction. The profile adjusting core is placed at one time and cannot move freely up and down, and cannot flexibly select the appropriate depth for profile adjustment, which affects the efficiency of the profile adjustment operation.

[0005] Therefore, it is necessary to provide an integrated injection and profile control string to solve the above technical problems. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides an integrated pipe string for injection and profile control.

[0007] The utility model provides an integrated injection and profile control string comprising: a casing, a Christmas tree installed at the top of the casing arranged in an oil well, a tubing inserted into the casing at the bottom end of the Christmas tree, a one-way valve, a screen tube and a plugging head arranged at the bottom end of the tubing in descending order;

[0008] There are several profile control assemblies, which are butt-jointed and installed on the oil pipe at equal intervals, and packers are installed on the upper sides of the several profile control assemblies on the oil pipe, and water distributors are installed on the lower sides of the several profile control assemblies. The profile control assembly includes an outer cylinder, and an inner cylinder is slidably installed in the outer cylinder, a first profile control fluid hole is opened on the inner cylinder, and a second profile control fluid hole is opened on the outer cylinder;

[0009] A profile adjusting core is provided for adjusting the alignment and connection between the profile adjusting liquid hole 1 and the profile adjusting liquid hole 2. The profile adjusting core is movably installed in the inner cylinder, and the profile adjusting core includes a connecting tube, a liquid inlet hole is provided on one side of the top end of the connecting tube, a liquid guide hole connected to the profile adjusting liquid hole 1 is provided on one side of the connecting tube, a docking joint is installed on the top end of the connecting tube, a sealing seat is installed on the bottom end of the connecting tube, and a self-adjusting part is installed on the sealing seat.

[0010] Preferably, the upper and lower ends of the outer cylinder are respectively equipped with an upper joint and a lower joint that are connected to the oil pipe. The end of the lower joint extending into the outer cylinder is fixedly installed with a limit spring. The top of the limit spring is fixedly installed with a spring seat. The spring seat is provided with a stepped hole and a supporting step that cooperates with the self-adjusting part. The bottom end of the inner cylinder is fixedly connected to the top of the spring seat.

[0011] Preferably, the self-adjusting part includes a sliding rod and a ball seat, the sliding rod is slidably mounted on the sealing seat, the ball seat is embedded in the guiding tube and is located above the liquid guide hole, the top end of the sliding rod is mounted with a ball head for sealing the ball seat, and a sealing disk is mounted on the sliding rod below the ball head, a return spring is mounted between the sealing disk and the sealing seat, a suspension bracket is mounted on the bottom end of the sealing seat, two support rods are symmetrically hinged on the suspension bracket, a support spring is provided between the two support rods, a connecting rod is mounted on the bottom end of the sliding rod, and the bottom end of the connecting rod is fixedly connected to the middle part of the support spring.

[0012] Preferably, the elastic coefficient of the return spring is greater than the elastic coefficient of the support spring.

[0013] Preferably, the outer diameter of the sealing disk is equal to the inner diameter of the conducting tube, and a sealing ring is embedded in the outer side wall of the sealing disk.

[0014] Preferably, a limiting guide groove is provided on one side of the inner cylinder, and a limiting pin is installed on the outer cylinder to slide in cooperation with the limiting guide groove.

[0015] Preferably, the outer diameter of the conducting tube is equal to the inner diameter of the inner cylinder, and grooves are provided on both ends of the conducting tube at the liquid guide hole, and sealing rings are embedded in the grooves.

[0016] Compared with related technologies, the integrated injection and profile control string provided by the present invention has the following beneficial effects:

[0017] The utility model provides an integrated pipe string for injection and profile control. By arranging a profile control component, the profile control component can move freely along the injection pipe by utilizing the cooperation of an outer cylinder, an upper joint, a lower joint, a limit spring, a spring seat, a support step, an inner cylinder and a profile control core. After being in place, the profile control is automatically started by hydraulic pressure after the profile control agent is injected. The overall structure is simple and the operation is convenient, which improves the efficiency of the injection and profile control operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a preferred embodiment of the integrated injection and profile control string provided by the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the profile control assembly provided by the present utility model;

[0020] Figure 3 This is a schematic diagram of the axial cross-section structure of the profile control assembly provided by the utility model;

[0021] Figure 4 This is a schematic structural diagram of the profile control core provided by the utility model;

[0022] Figure 5 This is a structural diagram of a sealing seat provided by the utility model with a self-adjusting component installed.

[0023] Numbers in the figure: 1, casing; 2, Christmas tree; 3, oil pipe; 4, one-way valve; 5, screen tube; 6, plugging head; 7, profile control assembly; 71, outer cylinder; 72, upper joint; 73, lower joint; 74, limit spring; 75, spring seat; 751, support step; 76, inner cylinder; 77, profile control core; 771, guide tube; 772, butt joint; 773, sealing seat; 774, sealing ring; 78, Self-adjusting part; 781, sliding rod; 782, ball seat; 783, ball head; 784, sealing disk; 785, return spring; 786, suspension bracket; 787, strut; 788, support spring; 789, connecting rod; 701, profile control fluid hole 1; 702, profile control fluid hole 2; 703, limiting guide groove; 704, fluid inlet hole; 705, fluid guide hole; 711, limiting pin; 8, packer; 9, water distributor. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0026] See also Figures 1 to 5 The embodiment of the present invention provides an integrated pipe string for injection and profile control, the integrated pipe string for injection and profile control comprising:

[0027] Casing 1, which is installed in the oil well. The top of the casing 1 is installed with a Christmas tree 2. The bottom of the Christmas tree 2 is connected to an oil pipe 3 inserted into the casing 1. The bottom of the oil pipe 3 is equipped with a one-way valve 4, a screen 5 and a plug 6 in order from top to bottom;

[0028] There are several profile control assemblies 7, which are docked and installed on the oil pipe 3 at equal intervals. A packer 8 is installed on the upper side of the several profile control assemblies 7 on the oil pipe 3, and a water distributor 9 is installed on the lower side of the several profile control assemblies 7. The profile control assembly 7 includes an outer cylinder 71, and an inner cylinder 76 is slidably installed in the outer cylinder 71. The inner cylinder 76 is provided with a profile control fluid hole 1 701, and the outer cylinder 71 is provided with a profile control fluid hole 2 702;

[0029] The profile adjusting core 77 is used to adjust the alignment and communication between the profile adjusting liquid hole 1 701 and the profile adjusting liquid hole 2 702. The profile adjusting core 77 is movably installed in the inner cylinder 76, and the profile adjusting core 77 includes a connecting tube 771. A liquid inlet hole 704 is provided on one side of the top end of the connecting tube 771. A liquid guide hole 705 connected to the profile adjusting liquid hole 1 701 is provided on one side of the connecting tube 771. A docking joint 772 is installed on the top end of the connecting tube 771, and a sealing seat 773 is installed on the bottom end of the connecting tube 771. A self-adjusting part 78 is installed on the sealing seat 773.

[0030] An upper joint 72 and a lower joint 73 for docking with the oil pipe 3 are respectively installed at the upper and lower ends of the outer cylinder 71. A limit spring 74 is fixedly installed at one end of the lower joint 73 extending into the outer cylinder 71. A spring seat 75 is fixedly installed at the top of the limit spring 74. The spring seat 75 has a stepped hole and a supporting step 751 that cooperates with the self-adjusting member 78. The bottom end of the inner cylinder 76 is fixedly connected to the top of the spring seat 75.

[0031] The self-adjusting member 78 includes a slide rod 781 and a ball seat 782. The slide rod 781 is slidably mounted on the sealing seat 773. The ball seat 782 is embedded in the guide tube 771 and is located above the liquid guide hole 705. A ball head 783 for sealing the ball seat 782 is installed on the top of the slide rod 781, and a sealing disk 784 is installed on the slide rod 781 below the ball head 783. A return spring 785 is installed between the sealing disk 784 and the sealing seat 773. A suspension bracket 786 is installed at the bottom end of the sealing seat 773. Two support rods 787 are symmetrically hinged on the suspension bracket 786. A support spring 788 is provided between the two support rods 787. A connecting rod 789 is installed at the bottom end of the slide rod 781. The bottom end of the connecting rod 789 is fixedly connected to the middle part of the support spring 788.

[0032] It should be noted that: when in use, several profile control components 7 are connected to the oil pipe 3 one by one using the upper joint 72 and the lower joint 73, and then the packer 8 and the water distributor 9 are installed one by one. The installation setting is the same as the installation setting of the publication number CN 108999590 B. When the water is injected, the water distributor 9 of the corresponding depth is opened to inject water. When the profile is adjusted, the operation is the same as that of the publication number CN 108999590 The difference in operation between B is that the profile control core 77 does not need to be placed at the bottom of the oil pipe 3 first, and the profile control is performed from bottom to top. Here, it is specifically connected to the joint 772 of the profile control core 77 through a delivery rod or a steel cable, and can be moved from top to bottom along the oil pipe 3, or it can be pulled upward after being placed in the oil pipe 3. When it moves into the inner cylinder 76 of the profile control assembly 7 and needs to be adjusted, the profile control liquid is injected into the oil pipe 3, and the profile control liquid enters the guide pipe 771 through the liquid inlet hole 704. When entering, the hydraulic drive ball head 783 and the slide rod 781 move downward along the sealing seat 773, thereby moving away from the ball seat 782 (a through hole is provided in the middle of the ball seat 782, and a ball groove for contact sealing of the ball head 783 is provided on the outside of the through hole), thereby opening the guide hole 705. At this time, the guide hole 705 is connected to the profile control liquid hole 1 701. At the same time, when the slide rod 781 slides downward, the supporting spring 7 is driven by the connecting rod 789. 88 is stretched to a horizontal state, thereby supporting the spring 788 to push the support rod 787 out from both sides of the suspension bracket 786. After being pushed out, the guide tube 771 moves downward along the inner cylinder 76 until the support rod 787 is fixed on the support step 751 provided on the spring seat 75. Then, the inner cylinder 76 is pulled downward along the outer cylinder 71 to slide until the profile control liquid hole 1 701 is connected with the profile control liquid hole 2 702, thereby opening the completed profile control liquid injection channel. The profile control liquid enters the conducting tube 771 from the liquid inlet hole 704, then flows into the liquid guide hole 705 from the through hole of the ball seat 782, and is then poured into the oil well from the profile control liquid hole 1 701 and the profile control liquid hole 2 702 for profile control. After the profile control is completed, the profile control core 77 is taken out, and the inner cylinder 76 is automatically pushed upward by the limit spring 74 until the profile control liquid hole 1 701 and the profile control liquid hole 2 702 form a staggered seal, thereby facilitating water injection.

[0033] Among them, the elastic coefficient of the reset spring 785 is greater than the elastic coefficient of the support spring 788. In this way, when the profile adjustment core 77 is naturally placed and no profile adjustment fluid is injected, the reset spring 785 fixes the ball head 783 on the ball seat 782. At this time, the slide rod 781 pulls the support spring 788 to a state with a high middle and low ends through the connecting rod 789, thereby pulling the support rod 787 to retract into the suspension bracket 786, so that the profile adjustment core 77 can move freely in the inner cylinder 76, thereby realizing the position adjustment of the profile adjustment.

[0034] In the embodiments of the present invention, please refer to Figures 1 to 5A limiting guide groove 703 is provided on one side of the inner cylinder 76 , and a limiting pin 711 is installed on the outer cylinder 71 to slide with the limiting guide groove 703 .

[0035] It should be noted that: when the conducting tube 771 uses the support rod 787 of the self-adjusting part 78 to squeeze the spring seat 75 and move downward, driving the inner cylinder 76 to move synchronously, with the cooperation of the limiting pin 711 and the limiting guide groove 703, it can move vertically along its axis without deflection, so as to facilitate the alignment and connection of the profile adjustment liquid hole 1 701 and the profile adjustment liquid hole 2 702.

[0036] In the embodiments of the present invention, please refer to Figures 1 to 5 The outer diameter of the sealing disk 784 is equal to the inner diameter of the conducting tube 771, and a sealing ring is embedded in the outer wall of the sealing disk 784;

[0037] It should be noted that: when the profile adjustment fluid is injected into the slide rod 781, when the ball head 783 is pressed away from the ball seat 782, the hydraulic pressure continues to squeeze the sealing disk 784 and move it downward along the guide tube 771, so that the slide rod 781 can move downward stably, and then the connecting rod 789 moves downward synchronously, pressing the support spring 788 downward into a horizontal state. The horizontal support spring 788 stretches the support rod 787 to facilitate support.

[0038] In the embodiments of the present invention, please refer to Figures 1 to 5 The outer diameter of the conducting tube 771 is equal to the inner diameter of the inner cylinder 76 , and grooves are provided at both ends of the conducting tube 771 at the liquid guide hole 705 , and sealing rings 774 are embedded in the grooves.

[0039] It should be noted that after the conducting tube 771 is inserted into the inner cylinder 76, the sealing rings 774 on both sides can be used to seal the gap between the conducting tube 771 and the inner cylinder 76 to prevent liquid from leaking from the gap, causing self-adjustment failure and affecting the normal opening of the profile adjustment channel.

[0040] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0041] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An integrated tubing string for injection and profile control, comprising: A casing (1), the top of the casing (1) being arranged in an oil well, is provided with a Christmas tree (2), the bottom of the Christmas tree (2) is connected to an oil pipe (3) inserted into the casing (1), and the bottom of the oil pipe (3) is provided with a one-way valve (4), a screen (5) and a plug (6) in order from top to bottom; It is characterized by further comprising: A plurality of profile control assemblies (7) are provided, wherein the plurality of profile control assemblies (7) are butt-jointed and mounted on the oil pipe (3) at equal intervals, and a packer (8) is mounted on the upper side of the plurality of profile control assemblies (7) on the oil pipe (3), and a water distributor (9) is mounted on the lower side of the plurality of profile control assemblies (7), wherein the profile control assembly (7) comprises an outer cylinder (71), and an inner cylinder (76) is slidably mounted in the outer cylinder (71), a profile control fluid hole 1 (701) is provided on the inner cylinder (76), and a profile control fluid hole 2 (702) is provided on the outer cylinder (71); A profile adjusting core (77) is used to adjust the alignment and communication between the profile adjusting liquid hole 1 (701) and the profile adjusting liquid hole 2 (702). The profile adjusting core (77) is movably installed in the inner cylinder (76), and the profile adjusting core (77) includes a conducting tube (771), a liquid inlet hole (704) is provided on one side of the top end of the conducting tube (771), a liquid conducting hole (705) connected to the profile adjusting liquid hole 1 (701) is provided on one side of the conducting tube (771), a docking joint (772) is installed on the top end of the conducting tube (771), a sealing seat (773) is installed on the bottom end of the conducting tube (771), and a self-adjusting part (78) is installed on the sealing seat (773).

2. The integrated pipe string for injection and profile control according to claim 1, characterized in that: An upper joint (72) and a lower joint (73) connected to the oil pipe (3) are respectively installed at the upper and lower ends of the outer cylinder (71); a limit spring (74) is fixedly installed on one end of the lower joint (73) extending into the outer cylinder (71); a spring seat (75) is fixedly installed on the top end of the limit spring (74); the spring seat (75) is provided with a stepped hole and a supporting step (751) that cooperates with the self-adjusting member (78); the bottom end of the inner cylinder (76) is fixedly connected to the top end of the spring seat (75).

3. The integrated pipe string for injection and profile control according to claim 1 or 2, characterized in that: The self-adjusting member (78) includes a slide rod (781) and a ball seat (782), wherein the slide rod (781) is slidably mounted on the sealing seat (773), and the ball seat (782) is embedded in the conducting tube (771) and located above the liquid guide hole (705). A ball head (783) for sealing the ball seat (782) is mounted on the top of the slide rod (781), and a sealing disk (784) is mounted on the slide rod (781) below the ball head (783). A return spring (785) is installed between the sealing disk (784) and the sealing seat (773), a suspension frame (786) is installed at the bottom end of the sealing seat (773), two support rods (787) are symmetrically hinged on the suspension frame (786), a support spring (788) is provided between the two support rods (787), a connecting rod (789) is installed at the bottom end of the sliding rod (781), and the bottom end of the connecting rod (789) is fixedly connected to the middle part of the support spring (788).

4. The integrated pipe string for injection and profile control according to claim 3, characterized in that: The elastic coefficient of the return spring (785) is greater than the elastic coefficient of the support spring (788).

5. The integrated pipe string for injection and profile control according to claim 3, characterized in that: The outer diameter of the sealing disk (784) is equal to the inner diameter of the conducting tube (771), and a sealing ring is embedded in the outer wall of the sealing disk (784).

6. The integrated pipe string for injection and profile control according to claim 1, characterized in that: A limiting guide groove (703) is provided on one side of the inner cylinder (76), and a limiting pin (711) is mounted on the outer cylinder (71) and is in sliding engagement with the limiting guide groove (703).

7. The integrated pipe string for injection and profile control according to claim 1, characterized in that: The outer diameter of the conducting tube (771) is equal to the inner diameter of the inner cylinder (76), and grooves are provided at both ends of the conducting hole (705) on the conducting tube (771), and sealing rings (774) are embedded in the grooves.

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