Packer capable of increasing residual oil quantity

Abstract

The invention discloses a packer capable of increasing the remaining oil quantity, and relates to the technical field of oil field downhole tools. A counter bore is formed in the portion, at a solid body, of an upper pipe cavity of the flow dividing connector, an oil inlet hole is formed in the solid body to enable the counter bore to be communicated with the outside of the flow dividing connector, the upper portion of the counter bore extends upwards to form a connecting and guiding sleeve, a bridging hole is formed in the portion, on the outer side of the connecting and guiding sleeve, of the solid body 303 to enable the upper pipe cavity to be communicated with a lower pipe cavity, and the connecting and guiding sleeve is fixedly connected with a separation sleeve through a sealing ring. A stepped hole is machined in the lower portion of the oil pipe female thread of the upper connector, and the separation sleeve is in clearance fit connection with the stepped hole through a sealing ring. The method has the beneficial effects that through the construction technology of bottom injection and top production, the deficit of an oil layer is effectively filled, the total production amount of remaining oil is increased, the input cost of each well is reduced, the method is formed by assembling eight main parts, compared with the prior art, the number of the parts is reduced by 60%, the structure is simple, and the cost is low. And the upper part and the lower part of an oil layer are simultaneously blocked, and a packer does not need to be additionally put.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas production equipment. The control system composed of the equipment can control the oil volume, and in particular to a packer for increasing the residual oil volume. Background Art

[0002] Since the oil layer is located several thousand meters or even deeper underground and has a large oil reserve, after the crude oil in the oil layer is extracted to a certain extent, the oil layer has a large deficit and it is difficult to extract the remaining oil. In order to extract as much crude oil as possible from the oil layer, the process currently used in the industry is to inject water into the upper layer of the oil layer to fill the deficit of the oil layer so that the remaining oil in the oil layer has sufficient extraction pressure. This process is called upper injection and lower extraction. The problem with this process is that the water layer is located above the oil layer, and the filling of the deficit in the oil layer is not ideal; Announcement No. CN 111810078 B discloses a bridge packer, in which a diversion joint bridges the waterway and the oilway, and has an upper annular passage for oil-water separation, so that the water layer passes through the oil layer and is injected below the oil layer, forming a construction process of lower injection and upper production, effectively filling the deficit of the oil layer, increasing the total amount of remaining oil produced, and reducing the investment cost of each well. However, in this technical solution, only one rubber cylinder is provided to isolate the upper part of the oil layer. When producing oil, it is necessary to connect another packer in series at the lower part of the bridge packer to isolate the lower part of the oil layer. The single function increases the investment cost and the operating cost. At the same time, the bridge packer has the problems of complex structure, high cost, and high failure rate of many parts. Summary of the invention

[0003] In order to solve the problem that the existing oil field injection and production packers have single functions and complex structures, the present invention provides a packer for improving the amount of residual oil.

[0004] The technical solution provided by the present invention is: a packer for improving the amount of residual oil, comprising an upper joint and a lower joint, wherein the upper joint is processed with a female thread of an oil pipe, the lower joint is processed with a male thread of an oil pipe, a lower extension pipe is extended downward from the lower part of the upper joint, a water inlet hole is opened on the upper joint to connect the inner hole of the lower extension pipe with the outside of the upper joint, the lower extension pipe is connected to the diversion joint, an upper tube cavity is arranged on the upper part of the diversion joint, the upper tube cavity and the lower extension pipe are connected by a shear pin A, an upper rubber cylinder is arranged between the upper joint and the top of the upper tube cavity, a one-way tooth ring is processed on the lower part of the lower extension pipe, a one-way tooth hole is processed on the inner hole of the upper tube cavity, the one-way tooth hole and the one-way tooth ring are matched and connected so that the upper joint and the diversion joint can be close to each other but cannot be far away; A lower tube cavity is provided at the lower part of the shunt joint, the upper tube cavity and the lower tube cavity are separated by a solid body and are not connected to each other, the lower part of the lower tube cavity is connected to the adapter through the oil pipe thread seal, the lower part of the adapter is connected to the lower joint through the shear pin B, a lower rubber cylinder is provided between the adapter and the lower joint, the adapter and the lower joint are connected through a one-way tooth, and the one-way tooth connection structure is the same as the shunt joint and the upper joint connection structure; The upper tube cavity of the shunt joint is provided with a countersunk hole in the solid body, and the solid body is provided with an oil inlet hole to connect the countersunk hole with the outside of the shunt joint. A guide sleeve extends upward from the upper part of the countersunk hole. The solid body 303 is provided with a bridge hole on the outer side of the guide sleeve to connect the upper tube cavity and the lower tube cavity. The guide sleeve is fixedly connected to the separator sleeve through a sealing ring. The lower part of the female thread of the oil pipe of the upper joint is processed with a step hole, and the separator sleeve and the step hole are connected through a sealing ring clearance fit.

[0005] The receiving sleeve is fixedly connected to the separating sleeve by a sealing ring, and is replaced by: the separating sleeve and the receiving sleeve are connected by a sealing ring clearance fit, the separating sleeve and the receiving sleeve are connected by bearings and hole retaining rings for axial limiting rotation, the inner hole of the separating sleeve is welded with inner spiral blades, and the outer circle of the separating sleeve is welded with outer spiral blades.

[0006] The inner spiral blade is made of stainless steel, and the thickness of the inner spiral blade is 0.8-1.0 mm.

[0007] A groove is opened on the outer circle of the lower joint, and the groove is composed of a conical surface at the bottom, a cylindrical surface in the middle and a shoulder at the top. The groove of the lower joint is connected to the slips evenly distributed around the circumference, and the inner side of the slips fits with the conical surface and the cylindrical surface. The slips and the lower joint are connected by soluble pins, and a compression spring is provided between the slips and the shoulder.

[0008] The beneficial effects of the present invention are as follows: water flows into the annulus between the separation sleeve and the lower extension pipe through the water inlet hole, and flows to the lower pipe cavity through the bridge hole, so that the water layer passes through the oil layer and is injected below the oil layer, forming a construction process of lower injection and upper production, which effectively fills the deficit of the oil layer, increases the total amount of remaining oil produced, and reduces the investment cost of each well. The present invention is assembled from eight main components. Compared with the prior art, the number of components is reduced by 60%, the structure is simple, and the upper and lower oil layers are blocked at the same time, without the need to insert an additional packer. The split design of the diverter joint and the adapter joint can connect a pipe column of appropriate length between the diverter joint and the adapter joint according to the thickness of the oil layer, and also has the function of preventing wax deposition during oil production. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Attached Figure 1 It is a schematic diagram of the structure of the present invention; Attached Figure 2 Yes Yes Figure 1 A magnified image of point A; Attached Figure 3 It is a structural schematic diagram of the flow splitter joint in the present invention; Attached Figure 4 It is a structural schematic diagram of the upper joint in the present invention; Attached Figure 5 It is a structural schematic diagram of the lower joint in the present invention.

[0010] In the figure, 1-upper joint, 101-water inlet hole, 102-step hole, 103-lower extension pipe, 104-one-way gear ring, 2-lower joint, 201-conical surface, 202-cylindrical surface, 203-shoulder, 3-diverter joint, 301-upper tube cavity, 302-lower tube cavity, 303-solid body, 304-oil inlet hole, 305-bridge hole, 306-lead sleeve, 307-one-way gear hole, 308-sink hole, 4-upper rubber cylinder, 5-lower rubber cylinder, 6-shear pin A, 7-shear pin B, 8-adapter, 9-separator sleeve, 901-external spiral blade, 902-inner spiral blade, 10-bearing, 11-hole retaining ring, 12-slip, 13-soluble pin. DETAILED DESCRIPTION

[0011] like Figures 1 to 4 As shown, a packer for increasing the amount of residual oil comprises an upper joint 1 and a lower joint 2, wherein the upper joint 1 is processed with a female thread of an oil pipe, and the lower joint 2 is processed with a male thread of an oil pipe, and a lower extension pipe 103 is extended downward from the lower part of the upper joint 1, and a water inlet hole 101 is opened on the upper joint 1 to connect the inner hole of the lower extension pipe 103 with the outside of the upper joint 1, and the lower extension pipe 103 is connected to a diverter joint 3, and an upper tube cavity 301 is provided on the upper part of the diverter joint 3, and the upper tube cavity 301 is connected to the lower extension pipe 103 through a shear pin A6, and an upper rubber cylinder 4 is provided between the upper joint 1 and the top of the upper tube cavity 301, and a one-way tooth ring 104 is processed on the lower part of the lower extension pipe 103, and a one-way tooth hole 307 is processed on the inner hole of the upper tube cavity 301, and the one-way tooth hole 307 and the one-way tooth ring 104 are matched and connected so that the upper joint 1 and the diverter joint 3 can be close to each other but cannot be far away; The lower part of the flow dividing joint 3 is provided with a lower tube cavity 302, the upper tube cavity 301 and the lower tube cavity 302 are separated by a solid body 303 and are not connected to each other, the lower part of the lower tube cavity 302 is connected to the adapter 8 through the oil pipe thread seal, the lower part of the adapter 8 is connected to the lower joint 2 through the shear pin B7, a lower rubber cylinder 5 is provided between the adapter 8 and the lower joint 2, and the adapter 8 and the lower joint 2 are connected through a one-way tooth, and the one-way tooth connection structure is the same as the connection structure of the flow dividing joint 3 and the upper joint 1; The upper tube cavity 301 of the shunt joint 3 is provided with a countersunk hole 308 at the solid body 303, and the solid body 303 is provided with an oil inlet hole 304 to connect the countersunk hole 308 with the outside of the shunt joint 3. A guide sleeve 306 extends upward from the upper part of the countersunk hole 308. The solid body 303 is provided with a bridge hole 305 on the outer side of the guide sleeve 306 to connect the upper tube cavity 301 and the lower tube cavity 302. The guide sleeve 306 is fixedly connected to the separation sleeve 9 through a sealing ring. The lower part of the female thread of the oil pipe of the upper joint 1 is processed with a step hole 102, and the separation sleeve 9 and the step hole 102 are connected by a sealing ring clearance fit.

[0012] During water injection, water flows through the water inlet hole 101 into the annulus between the separation sleeve 9 and the lower extension pipe 103, and flows to the lower pipe cavity 302 through the bridge hole 305. Crude oil enters the diverter joint 3 through the oil inlet hole 305, and the solid oil and water are divided, so that the water layer passes through the oil layer and is injected below the oil layer, forming a construction process of lower injection and upper production, which effectively fills the deficit of the oil layer and increases the total amount of remaining oil produced. By controlling the water injection flow rate, the recovery rate of the oil layer can be controlled, and the investment cost of each well is reduced. The present invention is assembled from eight main components. Compared with the prior art, the number of components is reduced by 60%, the structure is simple, and the oil layer can be blocked at the same time from top to bottom without the need to insert an additional packer. The split design of the diverter joint 3 and the adapter 8 can connect a pipe column of appropriate length between the diverter joint 3 and the adapter 8 according to the thickness of the oil layer.

[0013] The receiving sleeve 306 is fixedly connected to the separating sleeve 9 through a sealing ring, and is replaced by: the separating sleeve 9 and the receiving sleeve 306 are connected through a sealing ring clearance fit, the separating sleeve 9 and the receiving sleeve 306 are axially limited and rotatably connected through a bearing 10 and a hole retaining ring 11, an inner spiral blade 902 is welded to the inner hole of the separating sleeve 9, and an outer spiral blade 901 is welded to the outer circle of the separating sleeve 9.

[0014] The inner spiral blade 902 is made of stainless steel, and the thickness of the inner spiral blade 902 is 0.8-1.0 mm. When the water injection flow passes through the outside of the separation sleeve 9, the water flow drives the outer spiral blade 901 and the separation sleeve 9 to rotate. When oil is produced, the rotating inner spiral blade 902 disturbs the crude oil fluid. The inner spiral blade 902 made of thin plate vibrates under the action of the oil flow, decomposing the wax in the crude oil and playing a role in preventing wax deposition.

[0015] The outer circle of the lower joint 2 is provided with a groove, which is composed of a conical surface 201 at the bottom, a cylindrical surface 202 in the middle and a shoulder 203 at the top. The groove of the lower joint 2 is connected to the slips 12 evenly distributed around the circumference, and the inner side of the slips 12 fits with the conical surface 201 and the cylindrical surface 202. The slips 12 and the lower joint 2 are connected by soluble pins 13, and a compression spring is provided between the slips 12 and the shoulder 203.

[0016] The packer is connected to the pipe string and lowered. After being lowered into place, the soluble pin 13 dissolves, and the slip 12 slides down along the conical surface 201 and expands outward under the action of the compression spring to position and fix the packer as a whole. The pipe string at the top of the packer is lowered, the shear pin A6 and the shear pin B7 break, the upper joint 1 and the diverter joint 3 approach each other, the upper rubber cylinder 4 is sealed, the adapter 8 and the lower joint 2 approach each other, and the lower rubber cylinder 5 is sealed, so that the oil layer is sealed up and down. A adapter 8 connected to the oil pipe thread is provided at the lower part of the diverter joint 3. According to the thickness of the oil layer, a pipe string of appropriate length can be connected between the diverter joint 3 and the adapter 8.

Claims

1. A packer for increasing the amount of residual oil, comprising an upper joint (1) and a lower joint (2), characterized in that: The upper part of the upper joint (1) is processed with a female thread of an oil pipe, and the lower part of the lower joint (2) is processed with a male thread of an oil pipe. A lower extension pipe (103) extends downward from the lower part of the upper joint (1). The upper joint (1) is provided with a water inlet hole (101) to connect the inner hole of the lower extension pipe (103) with the outside of the upper joint (1). The lower extension pipe (103) is connected to the diverter joint (3). The upper part of the diverter joint (3) is provided with an upper tube cavity (301). The upper tube cavity (301) is connected to the lower tube cavity (301). The extension tube (103) is connected via a shear pin A (6); an upper rubber tube (4) is provided between the upper joint (1) and the top of the upper tube cavity (301); a one-way tooth ring (104) is processed at the lower part of the lower extension tube (103); a one-way tooth hole (307) is processed in the inner hole of the upper tube cavity (301); the one-way tooth hole (307) and the one-way tooth ring (104) are connected in a coordinated manner so that the upper joint (1) and the diverter joint (3) can be close to each other but cannot be separated; The lower part of the flow dividing joint (3) is provided with a lower tube cavity (302), the upper tube cavity (301) and the lower tube cavity (302) are separated by a solid body (303) and are not connected to each other, the lower part of the lower tube cavity (302) is connected to the adapter (8) through an oil pipe thread seal, the lower part of the adapter (8) is connected to the lower joint (2) through a shear pin B (7), a lower rubber cylinder (5) is provided between the adapter (8) and the lower joint (2), and the adapter (8) and the lower joint (2) are connected through a one-way tooth, and the one-way tooth connection structure is the same as the connection structure of the flow dividing joint (3) and the upper joint (1); The upper tube cavity (301) of the flow dividing joint (3) is provided with a counterbore (308) at the solid body (303), and the solid body (303) is provided with an oil inlet hole (304) to connect the counterbore (308) with the outside of the flow dividing joint (3). A guide sleeve (306) extends upward from the upper part of the counterbore (308), and the solid body (303) is provided with a bridge hole (305) on the outer side of the guide sleeve (306) to connect the upper tube cavity (301) and the lower tube cavity (302). The guide sleeve (306) is fixedly connected to the separation sleeve (9) through a sealing ring, and a step hole (102) is processed at the lower part of the female thread of the oil pipe of the upper joint (1), and the separation sleeve (9) and the step hole (102) are connected through a sealing ring clearance fit.

2. A packer for increasing the amount of residual oil according to claim 1, characterized in that: The receiving sleeve (306) is fixedly connected to the separation sleeve (9) via a sealing ring, and is replaced by: the separation sleeve (9) and the receiving sleeve (306) are connected via a sealing ring clearance fit, the separation sleeve (9) and the receiving sleeve (306) are axially limited and rotatably connected via a bearing (10) and a hole retaining ring (11), the inner hole of the separation sleeve (9) is welded with an inner spiral blade (902), and the outer circle of the separation sleeve (9) is welded with an outer spiral blade (901).

3. A packer for increasing the amount of residual oil according to claim 2, characterized in that: The inner spiral blade (902) is made of stainless steel, and the thickness of the inner spiral blade (902) is 0.8-1.0 mm.

4. A packer for increasing the amount of residual oil according to claim 2, characterized in that: The outer circle of the lower joint (2) is provided with a groove, which is composed of a conical surface (201) at the bottom, a cylindrical surface (202) in the middle and a shoulder (203) at the top. The groove of the lower joint (2) is connected to slips (12) evenly distributed around the circumference. The inner side of the slips (12) fits the conical surface (201) and the cylindrical surface (202). The slips (12) and the lower joint (2) are connected by a soluble pin (13). A compression spring is provided between the slips (12) and the shoulder (203).

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