Integrated squeezing and sealing tubular column

Abstract

The invention discloses an integrated squeezing and sealing tubular column, and relates to the technical field of oil and gas exploitation, the integrated squeezing and sealing tubular column comprises a plugging tube body, a plugging piston sleeve is fixedly mounted at one end of the plugging tube body, a plugging piston sleeve is slidably arranged in the plugging piston sleeve, and a first movable squeezing ring and a second movable pressurizing ring are slidably mounted on the outer surface of the plugging tube body; and a fixed pressurizing ring is fixedly mounted on the outer surface of the plugging pipe body. The connecting sleeve is matched with the ball seat, plugging and fixing can be completed only by releasing the steel ball once, and the plugging pipe body can be separated from the separating seat; the steel balls put into the oil well can be recycled, so that the cost for plugging the oil well sleeve is reduced; by controlling the contact time point of the steel ball and the ball seat, sealing and fixing can be conducted at the same time, and therefore the construction efficiency of blocking the oil well sleeve is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploitation, in particular to an integrated squeeze-sealed pipe column. Background Art

[0002] Integrated sealing tools are mainly used for temporary or permanent sealing or secondary cementing of oil, gas and water layers. Cement slurry is squeezed into the well section that needs to be sealed in the annulus or into the cracks and pores in the formation through the retainer to achieve the purpose of sealing and plugging.

[0003] For this purpose, in the prior art, an invention patent with publication number CN112096340A provides an integrated squeeze-sealed pipe column. Although the technical solution used in the integrated squeeze-sealed pipe column can achieve the purpose of plugging and leak-proofing, it needs to be dropped multiple times, making the operation very cumbersome, and the dropped steel balls cannot be recovered. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: an integrated extrusion sealing column, including a sealing tube body, one end of the sealing tube body is fixedly installed with a sealing piston sleeve, a sealing piston sleeve is slidably arranged in the sealing piston sleeve, the outer surface of the sealing tube body is also slidably installed with a first movable extrusion ring and a second movable pressure ring, the outer surface of the sealing tube body is fixedly installed with a fixed pressure ring, a sealing rubber ring is arranged between the fixed pressure ring and the second movable pressure ring, a sealing rubber ring is arranged between the second movable pressure ring and the first movable extrusion ring, and a sliding groove is opened on the sealing tube body. A push rod and a check rod are slidably installed in the groove, and the push rod and the check rod are fixedly installed on a locking card plate. A check hook is provided on the locking card plate, and a center locking column is provided in the middle of the blocking tube body. The center locking column and the push rod are movably connected through an expansion rod. A driving seat is also slidably installed in the blocking tube body, and a connecting sleeve is fixedly installed on the driving seat. A ball seat is fixedly installed in the connecting sleeve through a shear pin. A separation seat is overlapped at one end of the blocking tube body, and a separation sliding groove is provided in the separation seat. A convex ring that slidably cooperates with the separation sliding groove is provided on the ball seat, and the convex ring and the separation sliding groove are fixedly connected through a shear pin.

[0005] Preferably, the blocking piston sleeve is in contact or fixed fit with the first movable extrusion ring, one-half of the outer surface of the blocking piston sleeve is provided with a movable check claw, and the blocking piston cylinder sleeve is provided with a fixed check claw engaged with the movable check claw.

[0006] Preferably, the locking card, the check rod and the two push rods form a fixed assembly, the two push rods in the fixed assembly are symmetrically arranged on both sides of the check rod, and there are at least 9 groups of fixed assemblies, and the 9 groups of fixed assemblies are arranged in a circular array on the outer surface of the blocking tube body.

[0007] Preferably, the two push rods in each group of the fixing components are movably connected to the central locking column via two expansion rods.

[0008] Preferably, the connecting sleeve is slidably matched with the ball seat, a second flow hole is opened in the driving seat, a guide head is fixedly installed on the blocking tube body, a through hole is opened at the axial position of the guide head, and a sealing pin is interference fit in the through hole.

[0009] Preferably, the blocking tube body is provided with a first flow hole for connecting the interior of the blocking piston sleeve with the interior of the blocking tube body.

[0010] Preferably, a check assembly is fixedly installed at the position of the check rod in the blocking tube body, the number of the check assemblies at the check rod position is the same as the number of the fixed assemblies, and the check assembly is also arranged on the outside of the driving seat.

[0011] Preferably, the check assembly comprises a check block fixedly connected to the blocking tube body, a ramp groove is provided in the check block, a check cylinder is slidably installed in the ramp groove, and a leaf spring is fixedly installed between the check cylinder and the inner wall of the ramp groove.

[0012] Preferably, the check cylinder in the check assembly at the check rod position is frictionally matched with the surface of the check rod, and the check cylinder in the check assembly outside the drive seat is frictionally matched with the surface of the drive seat.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The connection sleeve and the ball seat provided in the present invention cooperate with each other, and only one release of the steel ball is required to complete the sealing and fixing, and the sealing pipe body can be separated from the separation seat; (2) The steel ball dropped into the oil well by the present invention can be recovered, thereby reducing the cost of sealing the oil well casing; (3) The present invention can achieve sealing and fixing at the same time by controlling the time point when the steel ball contacts the ball seat, thereby improving the construction efficiency of sealing the oil well casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0015] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0016] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle.

[0017] Figure 4 For the present invention Figure 2 Schematic diagram of the structure at point B in the middle.

[0018] Figure 5 For the present invention Figure 2 Schematic diagram of the structure at point C in the middle.

[0019] Figure 6 It is a structural schematic diagram of the center locking column of the present invention.

[0020] Figure 7 It is a schematic diagram of the structure of the sealing piston sleeve of the present invention.

[0021] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point D in the middle.

[0022] In the figure: 101-guide head; 102-blocking tube body; 1021-first flow hole; 103-blocking piston sleeve; 1031-fixed non-return claw; 104-blocking piston sleeve; 1041-movable non-return claw; 105-first movable extrusion ring; 106-second movable pressure ring; 107-fixed pressure ring; 108-sealing rubber ring; 109-locking card plate; 110-push rod; 111-expansion rod; 112-center locking column; 113-non-return rod; 114-driving seat; 1141-second flow hole; 115-connecting sleeve; 116-ball seat; 1161-convex ring; 117-shear pin; 118-separation seat; 1181-separation sliding groove; 119-sealing pin; 201-non-return block; 202-non-return cylinder; 203-leaf spring; 3-steel ball. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] like Figure 1-Figure 8As shown, the present invention provides an integrated extrusion sealing column, including a sealing tube body 102, one end of the sealing tube body 102 is fixedly installed with a sealing piston sleeve 103, a sealing piston sleeve 104 is slidably arranged in the sealing piston sleeve 103, the outer surface of the sealing tube body 102 is also slidably installed with a first movable extrusion ring 105 and a second movable pressure ring 106, a fixed pressure ring 107 is fixedly installed on the outer surface of the sealing tube body 102, a sealing rubber ring 108 is arranged between the fixed pressure ring 107 and the second movable pressure ring 106, a sealing rubber ring 108 is arranged between the second movable pressure ring 106 and the first movable extrusion ring 105, a sliding groove is opened on the sealing tube body 102, a push rod 110 and a check rod 113 are slidably installed in the sliding groove, and the push rod 110 and The check rod 113 is fixedly mounted on the locking card plate 109, and a check hook is provided on the locking card plate 109. A central locking column 112 is provided in the middle of the blocking tube body 102, and the central locking column 112 is movably connected to the push rod 110 through the expansion rod 111. A driving seat 114 is also slidably installed in the blocking tube body 102, and a connecting sleeve 115 is fixedly mounted on the driving seat 114. A ball seat 116 is fixedly mounted in the connecting sleeve 115 through a shear pin 117. A separation seat 118 is overlapped at one end of the blocking tube body 102, and a separation sliding groove 1181 is provided in the separation seat 118. A convex ring 1161 that slidably cooperates with the separation sliding groove 1181 is provided on the ball seat 116, and the convex ring 1161 is fixedly connected to the separation sliding groove 1181 through the shear pin 117. The blocking piston sleeve 104 is in contact or fixed cooperation with the first movable extrusion ring 105, and a movable check claw 1041 is provided on one-half of the outer surface of the blocking piston sleeve 104, and a fixed check claw 1031 engaged with the movable check claw 1041 is provided on the blocking piston sleeve 103. The locking clamp 109, the check rod 113 and the two push rods 110 form a fixed assembly, and the two push rods 110 in the fixed assembly are symmetrically arranged on both sides of the check rod 113, and the fixed assembly is at least 9 groups, and the 9 groups of fixed assemblies are circularly arrayed on the outer surface of the blocking tube body 102. The two push rods 110 in each group of fixed assemblies are movably connected to the central locking column 112 through two expansion rods 111. The connecting sleeve 115 is slidably matched with the ball seat 116, a second flow hole 1141 is provided in the driving seat 114, a guide head 101 is fixedly installed on the plugging tube body 102, a through hole is provided at the axial position of the guide head 101, and a sealing pin 119 is interference-fitted in the through hole. A first flow hole 1021 is provided on the plugging tube body 102 for connecting the inside of the plugging piston sleeve 103 with the inside of the plugging tube body 102. A check assembly is fixedly installed at the position of the check rod 113 in the plugging tube body 102, the number of the check assembly at the position of the check rod 113 is the same as the number of the fixed assembly, and the check assembly is also arranged on the outside of the driving seat 114.The check assembly includes a check block 201 fixedly connected to the blocking tube body 102, a ramp groove is provided inside the check block 201, a check cylinder 202 is slidably installed in the ramp groove, and a leaf spring 203 is fixedly installed between the check cylinder 202 and the inner wall of the ramp groove. The check cylinder 202 in the check assembly at the position of the check rod 113 is frictionally matched with the surface of the check rod 113, and the check cylinder 202 in the check assembly outside the drive seat 114 is frictionally matched with the surface of the drive seat 114.

[0025] The working principle of an integrated extrusion sealing pipe column disclosed in the present invention is as follows: fix the separation seat 118 in the device to one end of the pipe column, and then move the device through the pipe column to the position to be sealed in the oil well casing (before this, the sealing pipe body 102 and the pipe column have been filled with water), and then pressurize the pipe column through an external device. At this time, the pressure inside the sealing pipe body 102 will increase, and the liquid inside the sealing pipe body 102 will enter the chamber between the sealing piston sleeve 103 and the sealing pipe body 102 through the first flow hole 1021, so that the pressure pushes the sealing piston sleeve 104 to move, and the movement of the sealing piston sleeve 104 will drive the first movable extrusion ring 105 to move, and then the two sealing rubber rings 108 are squeezed and deformed to make them fit against the inner wall of the oil well casing and form a seal.

[0026] The sealing pin 119 may not be installed, so that the through hole of the guide head 101 is connected. In this case, there is no need to fill the sealing tube body 102 and the pipe column with water first. The sealing tube body 102 can be pressurized by external equipment so that the water inflow into the sealing tube body 102 is greater than the water outflow from the through hole of the guide head 101 (the water outflow at the sealing pin 119). At this time, the pressure in the sealing tube body 102 will also increase, which is the same as the above function.

[0027] Then the steel ball 3 is put into the pipe column, and the steel ball 3 moves to the ball seat 116 along the action of the pipe column and gravity (and the water flow), blocking the ball seat 116. At this time, pressure is continued to be applied to the sealing pipe body 102 (the sealing pipe body 102 and the inside of the pipe column are connected) through external equipment, which will cause the water pressure to push the ball seat 116 to move. The movement of the ball seat 116 will drive the connecting sleeve 115 to move, and the movement of the connecting sleeve 115 will drive the driving seat 114 to move. The movement of the driving seat 114 will drive the central locking column 112 to move. The movement of the central locking column 112 will drive all the pushing rods 110 to move through all the expansion rods 111, and then the pushing rod 110 will push the locking card plate 109 to expand radially outward along the sealing pipe body 102, so that the locking card plate 109 is riveted to the inner wall of the oil well casing to achieve the fixing function. Due to the set non-return assembly, the non-return rod 113 cannot move in the reverse direction (toward the axial direction of the sealing pipe body 102). Figure 3As shown, this is because when the check rod 113 moves downward, the check rod 113 will apply a downward friction force to the check cylinder 202, causing the check cylinder 202 to move downward, and under the action of the leaf spring 203, the check cylinder 202 also moves downward, and when the check cylinder 202 moves downward, the gap between the check rod 113 and the bevel groove of the check block 201 will become smaller and smaller. The smaller the gap, the greater the squeezing of the check cylinder 202 will be, resulting in an increase in the friction force between the check cylinder 202 and the check rod 113, thereby hindering the movement of the check rod 113. Similarly, the check assembly set at the drive seat 114 is the same, and can prevent the drive seat 114 from moving in the opposite direction (towards the separation seat 118). When the pipe string needs to be pulled out of the casing, the pressure in the pipe string is increased to make the ball seat 116 continue to move. When the pressure on the ball seat 116 is greater than the shear stress of the two shear pins 117, the shear pins 117 will break. At this time, the ball seat 116 and the connecting sleeve 115 move relative to each other, and the convex ring 1161 and the separation sliding groove 1181 slide relative to each other. Then, the ball seat 116, the separation seat 118, and the steel ball 3 can be pulled out of the casing together through the pipe string. This is because the convex ring 1161 is set in the separation sliding groove 1181, so the ball seat 116 will eventually move with the separation seat 118. Figure 5 As shown, when the connecting sleeve 115 moves to the right, it will be stuck by the blocking tube body 102, so the connecting sleeve 115 cannot move to the right. When the shear pin 117 is not disconnected, the separation seat 118 is always in a contact and locked state with the blocking tube body 102.

Claims

1. An integrated squeeze-seal pipe column, characterized in that: The invention comprises a plugging tube body (102), one end of which is fixedly provided with a plugging piston sleeve (103), a plugging piston sleeve (104) being slidably provided in the plugging piston sleeve (103), a first movable extrusion ring (105) and a second movable pressure ring (106) being slidably provided on the outer surface of the plugging tube body (102), a fixed pressure ring (107) being fixedly provided on the outer surface of the plugging tube body (102), a sealing rubber ring (108) being provided between the fixed pressure ring (107) and the second movable pressure ring (106), a sealing rubber ring (108) being provided between the second movable pressure ring (106) and the first movable extrusion ring (105), a sliding groove being provided on the plugging tube body (102), a push rod (110) and a check rod (113) being slidably provided in the sliding groove, and the push rod (110) and the check rod (113) being fixedly provided. A non-return barb is arranged on the locking card plate (109), a central locking column (112) is arranged in the middle of the blocking tube body (102), the central locking column (112) and the push rod (110) are movably connected through an expansion rod (111), a driving seat (114) is slidably installed in the blocking tube body (102), a connecting sleeve (115) is fixedly installed on the driving seat (114), and the connecting sleeve (115) A ball seat (116) is fixedly installed inside by a shear pin (117); a separation seat (118) is overlapped on one end of the blocking tube body (102); a separation sliding groove (1181) is provided in the separation seat (118); a convex ring (1161) that slides with the separation sliding groove (1181) is provided on the ball seat (116); the convex ring (1161) and the separation sliding groove (1181) are fixedly connected by the shear pin (117).

2. The integrated squeeze-seal pipe column according to claim 1, characterized in that: The blocking piston sleeve (104) is in contact or fixed fit with the first movable extrusion ring (105), one-half of the outer surface of the blocking piston sleeve (104) is provided with a movable non-return claw (1041), and the blocking piston cylinder sleeve (103) is provided with a fixed non-return claw (1031) that is clamped with the movable non-return claw (1041).

3. The integrated squeeze-seal pipe column according to claim 2, characterized in that: The locking clamp (109), the check rod (113) and the two push rods (110) form a fixed assembly, the two push rods (110) in the fixed assembly are symmetrically arranged on both sides of the check rod (113), and there are at least 9 groups of fixed assemblies, and the 9 groups of fixed assemblies are arranged in a circular array on the outer surface of the blocking tube body (102).

4. The integrated squeeze-seal pipe column according to claim 3, characterized in that: The two push rods (110) in each group of the fixing components are movably connected to the central locking column (112) via two expansion rods (111).

5. The integrated squeeze-seal pipe column according to claim 4, characterized in that: The connecting sleeve (115) is slidably matched with the ball seat (116); a second flow hole (1141) is provided in the driving seat (114); a guide head (101) is fixedly mounted on the blocking tube body (102); a through hole is provided at the axial center position of the guide head (101); and a sealing pin (119) is interference-fitted in the through hole.

6. The integrated squeeze-seal pipe column according to claim 5, characterized in that: The blocking tube body (102) is provided with a first flow hole (1021) for connecting the interior of the blocking piston sleeve (103) and the interior of the blocking tube body (102).

7. The integrated squeeze-seal pipe column according to claim 6, characterized in that: A check assembly is fixedly installed at the position of the check rod (113) in the blocking tube body (102), the number of the check assemblies at the position of the check rod (113) is the same as the number of the fixed assemblies, and the check assembly is also arranged on the outside of the driving seat (114).

8. The integrated extrusion seal column according to claim 7, characterized in that: The non-return assembly comprises a non-return block (201) fixedly connected to the blocking tube body (102), a ramp groove is arranged inside the non-return block (201), a non-return cylinder (202) is slidably installed in the ramp groove, and a leaf spring (203) is fixedly installed between the non-return cylinder (202) and the inner wall of the ramp groove.

9. The integrated extrusion seal pipe column according to claim 8, characterized in that: The check cylinder (202) in the check assembly at the position of the check rod (113) is frictionally matched with the surface of the check rod (113), and the check cylinder (202) in the check assembly outside the drive seat (114) is frictionally matched with the surface of the drive seat (114).

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