A downhole casing crossover valve

Abstract

The utility model discloses an underground oil sleeve intercommunication valve, including sleeve and the upper joint and lower joint of fixed in the upper and lower ends of sleeve respectively, the upper joint is connected with the lower end of oil pipe, and the inner seal sliding sleeve is arranged in the middle part of the cavity of sleeve, and the sucker rod is arranged in the sleeve and is through the sleeve and inner seal sliding sleeve, and the lower part side of sucker rod is connected with control coupling, and the bottom of the upper joint in the sleeve is provided with upper card station, and the upper and lower ends of inner seal sliding sleeve are provided with elastic inner clamping claw, and elastic inner clamping claw is matched with upper card station and lower card station respectively, the utility model is used for the oil and water well workover operation process, and when lifting oil pipe, the oil and water in the oil pipe are arranged back to the well, and when the oil well needs to be washed hot, the sucker rod is lifted to open the oil discharge passage, and the oil sleeve space is communicated, can be washed well, and after well washing, the sucker rod is lowered, the passage is closed, and the oil is pumped normally, preventing the environmental pollution caused by falling.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a downhole oil casing connection valve. Background Technology

[0002] Currently, during well workover operations, oil and water are carried to the surface from the downhole tubing, increasing environmental risks. Removing oil and soil also increases the labor intensity and cost for operators. Furthermore, wax buildup requires hot washing to remove the wax from the well; conventional backwashing is time-consuming, uses a large amount of water, and is expensive. The long water cut recovery period affects oil production efficiency. Currently, downhole channel valves have limited functionality, low reuse rates, and high failure rates due to scaling. Utility Model Content

[0003] The technical problem this utility model aims to solve is that downhole channel valves have a single function, low reusability, and high failure rate due to scaling. This invention provides a downhole casing-oil connection valve that is low-cost and reusable. The application of this downhole casing-oil connection valve achieves two main benefits: first, it improves the success rate of oil drainage during well workover, reduces subsequent contaminant treatment, and lessens the labor intensity of workover work; second, it reduces the number of steel plate platforms used per well; and third, it saves on oil well dewaxing costs and minimizes impact on oil production. The overall input-output ratio is 1:2.5. Tool features: simple operation, low cost, high work efficiency, and reusable after passing inspection and testing.

[0004] The downhole casing connection valve provided by this utility model includes a sleeve and an upper connector and a lower connector fixed at the upper and lower ends of the sleeve respectively. The upper connector is connected to the lower end of the tubing. An inner sealing sleeve is provided in the middle of the sleeve cavity. A sucker rod is provided inside the sleeve, penetrating the sleeve and the inner sealing sleeve. The lower side of the sucker rod is connected to the control coupling. An upper locking platform is provided at the bottom end of the upper connector inside the casing. Elastic inner locking claws are provided at the upper and lower ends of the inner sealing sleeve. The elastic inner locking claws cooperate with the upper locking platform and the lower locking platform respectively.

[0005] An oil drain hole for the inner sealing sleeve is provided on the outer sleeve sidewall. The lower connector is located on the sleeve.

[0006] A lower clamping platform is provided at the top of the cylinder.

[0007] An O-ring is installed between the upper connector and the sleeve. An oil passage groove for the control coupling is provided on the outside of the control coupling.

[0008] The lower connector is located on the outer side of the sleeve and has a burst oil drain hole, which is equipped with a sealing baffle.

[0009] The sealing baffle seals the burst oil drain hole through the sealing baffle plum blossom pressure cap.

[0010] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following:

[0011] This utility model is used in oil and water well workover operations to drain oil and water back into the well when the tubing is pulled up. When the oil well needs dewaxing and hot washing, the sucker rod is pulled up to open the drain channel and connect the casing space for normal well washing. After the well washing is completed, the sucker rod is lowered down and the channel is closed for normal oil pumping, preventing the oil from falling to the ground and causing environmental pollution.

[0012] This utility model employs a dual-channel oil drainage system. When an oil well experiences pump jamming, uneven wear, or sucker rod breakage, making it impossible to lift the control coupling for oil drainage, the other drainage channel can be opened by pressurizing the pump truck to 20-25 MPa, thus achieving dual-channel oil drainage. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0014] Figure 1 is a structural schematic diagram of Embodiment 1 of this utility model;

[0015] Figure 2 is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0016] In the attached diagram, 1 is the oil pipe, 2 is the upper connector, 3 is the sucker rod, 4 is the O-ring seal, 5 is the upper clamping platform, 6 is the elastic inner clamping claw, 7 is the inner sealing sleeve, 8 is the inner sealing sleeve drain hole, 9 is the sleeve, 10 is the lower clamping platform, 11 is the sealing baffle cap, 12 is the sealing baffle, 13 is the burst drain hole, 14 is the control coupling, 15 is the lower connector, and 16 is the control coupling oil passage groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0018] Example 1:

[0019] As shown in Figure 1, this utility model provides a downhole oil casing connection valve, including a sleeve 9 and an upper connector 2 and a lower connector 15 fixed at the upper and lower ends of the sleeve 9 respectively. The upper connector 2 is connected to the lower end of the tubing 1, the upper end of the tubing 1 is connected to the surface oil pipeline 1, and the lower end of the lower connector 15 is connected to the upper end of the oil pipeline 1 of the oil pump. An inner sealing sleeve 7 is provided in the middle of the cavity of the sleeve 9. A sucker rod 3 is provided inside the sleeve 9, penetrating the sleeve 9 and the inner sealing sleeve 7. The upper end of the sucker rod 3 is connected to the surface pumping unit, the lower side of the sucker rod 3 is connected to the control coupling 14, and the lower end of the sucker rod 3 is connected to the plunger of the oil pump. An upper clamping platform 5 is provided at the bottom end of the upper connector 2 located inside the casing. Elastic inner clamping claws 6 are provided at the upper and lower ends of the inner sealing sleeve 7, and the elastic inner clamping claws 6 cooperate with the upper clamping platform 5 and the lower clamping platform 10 respectively. When operating on the ground, the sucker rod 3 moves downward inside the tubing 1. The control coupling 14 connected to the sucker rod 3 also moves accordingly. When it contacts the sealing sleeve 7 inside the device cavity, the elastic inner claws 6 at both ends of the elastic opening expand, causing it to disengage from the upper clamping platform 5 at the lower end of the upper connector 2. It continues to move downward, bringing the inner sealing sleeve 7 to the lower clamping platform 10 at the upper end of the lower connector 15. When the inner sealing sleeve 7 is stuck at the lower clamping platform 10 and can no longer move downward, the control coupling 14 continues to move downward, eventually completely disengaging the control coupling from the inner sealing sleeve 7. At this time, the elastic inner claws 6 of the inner sealing sleeve 7 reset and are stuck on the lower clamping platform 10, preventing the inner sealing sleeve 7 from moving up or down. At the same time, the inner sealing sleeve 7 seals the oil drain hole on the sleeve 9, achieving the sealing purpose.

[0020] This utility model adopts a sliding sleeve structure for use on the upper part of the oil pump in an oil well. It has multiple oil discharge functions. The control coupling 14 is directly connected in series with the sucker rod 3, and is installed and used in the same way as a normal coupling. The inner sealing sliding sleeve 7 is in the oil discharge cavity, and is slid up and down by means of the control coupling 14 to achieve the purpose of oil discharge and prevent it from falling to the ground and causing environmental pollution.

[0021] Example 2:

[0022] Unlike Embodiment 1, the lower connector 15 is provided with a burst drain hole 13 on the outer side of the sleeve 9. A sealing baffle 12 is provided at the burst drain hole 13. The sealing baffle 12 seals the burst drain hole 13 through the sealing baffle 12 plum blossom pressure cap 11. When the oil well experiences pump jamming or uneven wear, causing the sucker rod 3 to break off, and the inner sealing sleeve drain hole 8 cannot drain oil through the lifting control coupling 14, the other drain channel, namely the burst drain hole 13, can be opened by pressurizing 20-25 MPa by a ground pump truck. The sealing baffle 12 is broken, and the oil in the tubing 1 will be discharged back into the casing through the burst drain hole 13 to achieve dual-channel oil drainage.

Claims

1. A downhole casing crossover valve, characterized by It includes a sleeve and an upper connector and a lower connector fixed at the upper and lower ends of the sleeve respectively. The upper connector is connected to the lower end of the tubing. An inner sealing sleeve is provided in the middle of the sleeve cavity. A sucker rod is provided inside the sleeve, penetrating the sleeve and the inner sealing sleeve. The lower side of the sucker rod is connected to the control coupling. An upper clamping platform is provided at the bottom end of the upper connector inside the sleeve. Elastic inner clamping claws are provided at the upper and lower ends of the inner sealing sleeve. The elastic inner clamping claws cooperate with the upper clamping platform and the lower clamping platform respectively.

2. The downhole casing collar valve of claim 1, wherein, An oil drain hole for the inner sealing sleeve is provided on the outer sleeve side wall, and a lower clamping platform is provided at the top of the lower connector located inside the sleeve.

3. A downhole casing connection valve according to claim 2, characterized in that, The sealing baffle seals the burst oil drain hole through the sealing baffle plum blossom pressure cap.

4. A downhole casing connection valve according to claim 3, characterized in that, An O-ring is provided between the upper connector and the sleeve.

5. A downhole casing connection valve according to claim 1, characterized in that, An oil passage groove for the control coupling is provided on the outside of the control coupling.

6. A downhole casing connection valve according to claim 5, characterized in that, The lower connector is located on the outer side of the sleeve and has a burst oil drain hole, which is equipped with a sealing baffle.

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