Anti-backflow profile control water distributor

Abstract

The utility model discloses an anti-backflow profile control water distributor which comprises an upper connector, a connecting cylinder, a main body and a lower connector which are connected in sequence, a driving supporting cylinder is arranged in the connecting cylinder, the lower end of the driving supporting cylinder is fixedly connected to the main body, a fixed valve sleeve is arranged on the inner side of the lower end of the main body, and a profile control water distribution hole is formed in the fixed valve sleeve. The profile control water distribution hole is correspondingly communicated with a profile control water distribution outlet formed in the side wall of the main body, a movable valve sleeve matched with the fixed valve sleeve is arranged at the lower end of a driving sleeve, the driving sleeve is connected into a driving supporting cylinder in a sealed and screwed mode, the profile control water distribution outlet is a taper hole, and an anti-backflow movable plug composed of a taper plug part and a supporting part is arranged in the taper hole. The outer circumferential surface of the conical plug part corresponds to the conical surface of the profile control water distribution outlet, the supporting part is supported on the main body through a supporting piece, and the outer circumferential surface of the conical plug part is attached to the inner conical surface of the profile control water distribution outlet through a spring between the supporting piece and the conical plug part. The anti-backflow profile control water distributor can prevent underground impurities from entering an oil pipe.

Description

Technical Field

[0001] The utility model relates to a petroleum machine, in particular to a downhole profile adjustment and water distribution tool in an oil field. Background Art

[0002] Most oil wells rely on fracturing and water injection for production, so it is necessary to adopt downhole profile control and water distribution technology. Water or profile control agents are injected into the deep oil layer through water injection wells to improve the water injection development effect and the recovery rate in the water drive stage, ensuring stable and increased production of the oil field. The profile control and water distribution process is achieved through a dedicated profile control and water distribution tool. The profile control and water distribution tool includes a profile control and water distribution body, the two ends of which are respectively fixedly connected to the upper and lower joints. A fixed valve sleeve is installed on the profile control and water distribution body, and a profile control water injection hole is provided on the side wall of the fixed valve sleeve. The profile control water injection hole is connected to the profile control and water distribution outlet on the side wall of the profile control and water distribution body. A movable valve sleeve matching the fixed valve sleeve is installed at the lower end of a driving sleeve. The driving sleeve is screwed onto a driving support cylinder. The driving sleeve is rotated by an electric control instrument lowered from the wellhead to drive the movable valve sleeve up and down to open or close the profile control and water distribution hole on the fixed valve sleeve. Water or profile control agent input from the wellhead is output through the profile control and water distribution hole as needed to perform profile control and water distribution operations. The driving support cylinder is located above the profile control and water distribution body and is fixedly connected to the profile control and water distribution body. A sealing ring is provided between the driving sleeve and the driving support cylinder to prevent the inner cavity of the profile control and water distribution tool from communicating with the profile control and water distribution outlet through the gap between the driving sleeve and the driving support cylinder through the profile control and water distribution hole. During actual use of the above-mentioned profile control and water distribution tools, after the profile control and water distribution holes are opened for profile control and water distribution, the pressure of the downhole water injection layer or the profile control layer will often be greater than the pressure of the water or profile control agent input at the wellhead. This will cause downhole fluid and various impurities to flow back into the oil pipe through the profile control and water distribution outlet, which is the so-called backflow. The impurities vomited back into the profile control and water distribution device will make it difficult for the drive sleeve to rotate normally to drive the valve sleeve to open and close. The profile control and water distribution device will not work normally, and may even cause damage to various tools and facilities in the oil pipes above and below the profile control and water distribution device. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an anti-backspitting profile control water distributor, which can prevent underground impurities from entering the interior of the oil pipe.

[0004] In order to solve the above technical problems, the utility model provides an anti-backspitting profile-adjusting water distributor, comprising an upper joint, a connecting tube, a main body and a lower joint connected in sequence, a driving support tube is provided in the connecting tube, the lower end of the driving support tube is fixedly connected to the main body, a fixed valve sleeve is provided on the inner side of the lower end of the main body, a profile-adjusting water distribution hole is provided on the fixed valve sleeve, the profile-adjusting water distribution hole is correspondingly connected to the profile-adjusting water distribution outlet provided on the main body, a dynamic valve sleeve matched with the fixed valve sleeve is provided at the lower end of the driving sleeve, the driving sleeve is screwed in the driving support tube, and the driving sleeve and the driving support are connected. A driving sealing ring is provided between the cylinders, and the profile control water distribution outlet is a tapered hole arranged on the side wall of the main body. The large end of the tapered hole is located on the outer circumferential surface of the main body. An anti-backflow movable plug is provided in the tapered hole. The anti-backflow movable plug includes a tapered plug part and a supporting part. The outer circumferential surface of the tapered plug part corresponds to the tapered surface of the profile control water distribution outlet. The supporting part of the anti-backflow movable plug is supported on the main body through a supporting part. A spring is provided between the supporting part and the anti-backflow movable plug. The outer circumferential surface of the tapered plug part on the anti-backflow movable plug fits with the inner conical surface of the profile control water distribution outlet through the pressure of the spring.

[0005] After adopting the above technical solution, the profile control water distribution outlet on the main body will be in a closed state under the pressure of the spring through the anti-backflow movable plug. Only when the movable valve ring rises with the drive sleeve under the drive of the downhole electric adjustment tool to open the profile control water distribution hole on the fixed valve ring, the profile control water distribution medium (profile control agent or water) with a certain pressure in the oil pipe acts on the inner end of the anti-backflow movable plug, which will overcome the pressure of the spring and the downhole pressure to separate the anti-backflow movable plug fitted in the profile control water distribution hole from the conical surface of the profile control water distribution outlet, and the profile control water distribution outlet is opened to implement the profile control water distribution operation in the well. When the profile control water distribution operation is carried out At a certain point, the pressure of the downhole profile control layer or water injection layer will continue to rise to achieve the desired profile control and water distribution effect. At this time, the pressure of the profile control and water distribution medium pressed from the wellhead through the oil pipe will no longer increase. Once the pressure of the profile control and water distribution medium pressed into the wellhead drops or the pressure of the downhole oil layer fluctuates, causing the downhole pressure to exceed the pressure of the profile control and water distribution medium, this pressure will act on the outer end of the anti-backflow movable plug, pushing the anti-backflow movable plug inward and fitting it against the wall of the tapered hole of the profile control and water distribution outlet. The profile control and water distribution outlet will be closed and blocked, thereby preventing downhole impurities from entering the oil pipe through the profile control and water distribution outlet. At this time, there is no need to use the downhole electric adjustment tool to move the drive sleeve downward to cause the movable valve ring to close the profile control and water distribution hole. The profile control and water distribution operation can be repeated at any time by increasing the pressure of the profile control and water distribution medium, thereby improving operation efficiency.

[0006] In a preferred embodiment of the present invention, the support portion is a cylindrical body having a diameter smaller than the outer diameter of the tapered plug portion and is coaxially disposed with the tapered plug portion. This embodiment facilitates machining of the support portion without occupying excessive space in the profile control and water distribution outlet, facilitating spring installation, and coaxially disposed with the tapered plug portion also ensures stable operation of the anti-vomiting movable plug.

[0007] In another preferred embodiment of the present invention, the support portion of the anti-vomiting movable plug is movably inserted into a support guide hole of a support member. The support member is a plate-shaped component whose width is smaller than the small end diameter of the profile-control water distribution outlet. The support member is installed in a support member groove on the outer periphery of the main body. In this embodiment, the support member's support guide hole defines the movable position and direction of the anti-vomiting movable plug, ensuring the operational stability of the anti-vomiting movable plug. The plate-shaped component with a relatively small width minimizes the flow area of the profile-control water distribution outlet. The support member is installed in the support groove on the outer periphery of the main body, ensuring that the support member does not protrude from the outer peripheral surface of the profile-control water distribution tool.

[0008] Another preferred embodiment of the present invention is that a pressure balancing through hole is provided on the anti-backflow movable plug, and the pressure balancing through hole connects the inner and outer sides of the anti-backflow movable plug, a sealing plug is provided in the pressure balancing through hole, a sealing surface corresponding to the sealing plug is provided between the inner end of the pressure balancing through hole and the sealing plug, and a balancing spring is provided between the sealing surface and the sealing plug. With this embodiment, when the profile adjustment and water distribution tool is lowered into the well, the sealing plug will be pushed away from the sealing surface between the inner end of the pressure balancing through hole and the sealing plug under the action of the balancing spring, so that the downhole pressure can pass through the pressure balancing through hole into the closed cavity of the profile adjustment and water distribution hole at the inner end of the anti-backflow movable plug, so that the pressures on the upper and lower sides of the drive sealing ring provided between the drive sleeve and the drive support cylinder can be basically equal, and the drive sealing ring can be in a normal state. When the drive sleeve rises under the drive of the downhole electric adjustment tool and opens the profile adjustment and water distribution hole on the fixed valve ring, the drive sealing ring will not form a significant obstacle to the upward movement of the drive sleeve. If there is no pressure-balancing through hole, the cavity where the profile-adjusting and water-distributing hole is located between the anti-backflow movable plug and the movable valve ring below the driving sealing ring will be in a closed state with very low pressure, while the pressure above the driving sealing ring is very high under the action of the well column pressure in the oil pipe. Therefore, the pressure difference between the upper and lower parts of the driving sealing ring is very large, so that the driving sealing ring will be squeezed and deformed under the high pressure of the well column above and tightly attached between the driving sleeve and the driving support cylinder. When it is necessary to open the profile-adjusting and water-distributing channel, the driving sleeve will be greatly hindered by the deformed driving sealing ring and will be difficult to open, and may even cause damage to the downhole electric adjustment tool. After the profile control water distribution hole is opened, the profile control water distribution medium in the oil pipe overcomes the spring pressure to open the anti-backflow movable plug and perform the profile control water distribution operation. Similarly, the sealing plug in the anti-backflow movable plug will also be in an open state. When the downhole pressure is greater than the pressure of the profile control water distribution medium in the oil pipe, the downhole pressure will close the anti-backflow movable plug, and at the same time, the sealing plug in the anti-backflow movable plug will overcome the elastic force of the balance spring and be pressed toward the sealing surface. The pressure balance through hole will be closed at the same time, ensuring the realization of the anti-backflow function.

[0009] In a further preferred embodiment of the present invention, the sealing plug is a steel ball, the sealing surface is a conical surface, and the diameter of the pressure-balancing through-hole where the sealing plug is located is larger than the diameter of the steel ball. In this embodiment, the steel ball sealing plug and the conical sealing surface cooperate to ensure the closure and sealing of the pressure-balancing through-hole. The larger diameter of the pressure-balancing through-hole section where the sealing plug is located ensures unobstructed access when the pressure-balancing through-hole is open.

[0010] In another preferred embodiment of the present invention, a sealing plug stopper rod is provided in the pressure balance through hole outside the sealing plug. With this embodiment, the sealing plug stopper rod is used to prevent the sealing plug from moving outward and falling off, and has a simple structure and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The anti-backvomiting profile control water distributor of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0012] Figure 1 This is a structural diagram of a specific embodiment of the utility model anti-vomiting profile control water distributor;

[0013] Figure 2 yes Figure 1 A cross-sectional view of the structure shown at position AA;

[0014] Figure 3 yes Figure 2 A partial view taken along direction B of the structure shown.

[0015] In the figure: 1 - upper joint, 2 - connecting tube, 3 - drive support tube, 4 - drive sleeve, 5 - drive sealing ring, 6 - main body, 7 - movable valve sleeve, 8 - fixed valve sleeve, 9 - profile control water distribution hole, 10 - profile control water distribution outlet, 11 - support, 12 - support guide hole, 13 - spring, 14 - anti-backflow movable plug, 141 - cone plug part, 142 - support part, 15 - lower joint, 16 - support groove, 17 - balance spring, 18 - sealing surface, 19 - sealing plug, 20 - sealing plug stop rod, 21 - pressure balance through hole. DETAILED DESCRIPTION

[0016] exist Figure 1In the anti-backflow profile control water distributor shown, the upper joint 1, connecting tube 2, main body 6 and lower joint 15 are successively connected by threads and corresponding sealing rings. The upper joint 1 is also used to be screwed to the oil pipe above, and the lower joint 15 is also used to be screwed to the oil pipe below. A driving support tube 3 is provided in the connecting tube 2. The lower end of the driving support tube 3 is screwed and sealed to the main body 6. A fixed valve sleeve 8 is provided on the inner side of the lower end of the main body 6 through a valve sleeve seat. A profile control water distribution hole 9 is provided on the fixed valve sleeve 8 and its valve sleeve seat. The profile control water distribution hole 9 is correspondingly connected to the profile control water distribution outlet 10 provided on the side wall of the main body 6. The dynamic valve sleeve 7 matching the fixed valve sleeve 8 is fixed at the lower end of the driving sleeve 4. The driving sleeve 4 is screwed into the driving support tube 3. A driving sealing ring 5 is provided between the driving sleeve 4 and the driving support tube 3. See Figure 2 The profile control water distribution outlet 10 is a tapered hole provided on the side wall of the main body 6. The large end of the tapered hole is located on the outer circumference of the main body 6. An anti-vomiting movable plug 14 is provided in the tapered hole. The anti-vomiting movable plug 14 includes a tapered plug portion 141 and a supporting portion 142. The outer circumference of the tapered plug portion 141 corresponds to the tapered surface of the profile control water distribution outlet 10. The supporting portion 142 is a cylinder. The diameter of the cylinder is smaller than the outer diameter of the tapered plug portion 141 and is coaxially arranged with the tapered plug portion 141. The supporting portion 142 is movably inserted into the supporting guide hole 12 of the supporting member 11. Figure 3 The support member 11 is a strip-shaped plate-like component, the width of the plate-shaped component is smaller than the small end diameter of the profile control and water distribution outlet 10, and the support member 11 is installed in the support member groove 16 on the outer periphery of the main body 6. In this way, the support portion 142 of the anti-backflow movable plug 14 is supported on the main body 6 through the support member 11, and a spring 13 is provided between the support member 11 and the anti-backflow movable plug 14. The outer peripheral surface of the conical plug portion 141 on the anti-backflow movable plug 14 is fitted with the inner conical surface of the profile control and water distribution outlet 10 by the pressure of the spring 13.

[0017] like Figure 2 As shown, a pressure-balancing through-hole 21 is provided on the anti-vomiting movable plug 14. The axis of the pressure-balancing through-hole 21 is located on the axis of the anti-vomiting movable plug 14. The pressure-balancing through-hole 21 connects the inner and outer sides of the anti-vomiting movable plug 14. A sealing plug 19 is provided in the pressure-balancing through-hole 21. A sealing surface 18 corresponding to the sealing plug 19 is provided between the inner end of the pressure-balancing through-hole 21 and the sealing plug 19. A balancing spring 17 is provided between the sealing surface 18 and the sealing plug 19. As a preferred embodiment, the sealing plug 19 is a steel ball, and the sealing surface 18 is a conical surface, so that the pressure-balancing through-hole 21 is a stepped hole with a smaller inner end section and a larger outer end section. The diameter of the outer end section of the pressure-balancing through-hole 21 where the sealing plug 19 is located is larger than the diameter of the steel ball. A sealing plug retaining rod 20 is provided in the pressure-balancing through-hole 21 outside the sealing plug 19 to facilitate the installation of the steel ball serving as the sealing plug 19 and prevent the steel ball from falling.

[0018] The above lists only some specific implementation methods of the present invention, but the present invention is not limited to them. Many improvements and changes can be made. As long as the improvements and changes are made on the basis of the basic principles of the present invention, they should be deemed to fall within the scope of protection of the present invention.

Claims

1. An anti-backspitting profile-adjusting water distributor, comprising an upper joint (1), a connecting tube (2), a main body (6) and a lower joint (15) connected in sequence, a driving support tube (3) being provided in the connecting tube (2), the lower end of the driving support tube (3) being fixedly connected to the main body (6), a fixed valve sleeve (8) being provided on the inner side of the lower end of the main body (6), a profile-adjusting water distribution hole (9) being provided on the fixed valve sleeve (8), the profile-adjusting water distribution hole (9) being correspondingly connected to a profile-adjusting water distribution outlet (10) provided on the main body (6), a movable valve sleeve (7) matching the fixed valve sleeve (8) being provided at the lower end of a driving sleeve (4), the driving sleeve (4) being screwed into the driving support tube (3), a driving sealing ring (5) being provided between the driving sleeve (4) and the driving support tube (3), characterized in that: The profile-adjusting water distribution outlet (10) is a tapered hole arranged on the side wall of the main body (6), the large end of the tapered hole is located on the outer peripheral surface of the main body (6), and an anti-backflow movable plug (14) is arranged in the tapered hole. The anti-backflow movable plug (14) includes a tapered plug portion (141) and a supporting portion (142). The outer peripheral surface of the tapered plug portion (141) corresponds to the tapered surface of the profile-adjusting water distribution outlet (10). The supporting portion (142) of the anti-backflow movable plug (14) is supported on the main body (6) through a supporting member (11). A spring (13) is provided between the supporting member (11) and the anti-backflow movable plug (14). The outer peripheral surface of the tapered plug portion (141) on the anti-backflow movable plug (14) is fitted with the inner tapered surface of the profile-adjusting water distribution outlet (10) by the pressure of the spring (13).

2. The anti-vomiting profile control water distributor according to claim 1, characterized in that: The supporting portion (142) is a cylinder, the diameter of which is smaller than the outer diameter of the tapered plug portion (141) and the cylinder is coaxially arranged with the tapered plug portion (141).

3. The anti-vomiting profile control water distributor according to claim 1 or 2, characterized in that: The supporting portion (142) of the anti-backspitting movable plug (14) is movably inserted into the supporting guide hole (12) of the supporting member (11). The supporting member (11) is a plate-shaped member, the width of which is smaller than the small end diameter of the profile-adjusting water distribution outlet (10). The supporting member (11) is installed in a supporting member groove (16) on the outer periphery of the main body (6).

4. The anti-vomiting profile control water distributor according to claim 1 or 2, characterized in that: A pressure balancing through hole (21) is provided on the anti-backspitting movable plug (14), the pressure balancing through hole (21) communicating with the inner and outer sides of the anti-backspitting movable plug (14), a sealing plug (19) is provided in the pressure balancing through hole (21), a sealing surface (18) corresponding to the sealing plug (19) is provided between the inner end of the pressure balancing through hole (21) and the sealing plug (19), and a balancing spring (17) is provided between the sealing surface (18) and the sealing plug (19).

5. The anti-vomiting profile control water distributor according to claim 4, characterized in that: The sealing plug (19) is a steel ball, the sealing surface (18) is a conical surface, and the diameter of the pressure balance through hole (21) where the sealing plug (19) is located is larger than the diameter of the steel ball.

6. The anti-vomiting profile control water distributor according to claim 5, characterized in that: A sealing plug stopper rod (20) is provided in the pressure balance through hole (21) outside the sealing plug (19).

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