Continuous negative pressure sand washing pipe column device

Abstract

The utility model relates to the technical field of oil production engineering, and discloses a continuous negative pressure sand washing pipe column device which comprises a tee joint and a self-sealing well mouth, the self-sealing well mouth is installed, then a negative pressure sand washing pump and a concentric oil pipe are put down one by one, and after the device reaches the position near the sand surface, the tee joint is installed on the concentric oil pipe and connected with a water inlet and return pipeline; the tee joint comprises a main body and an outlet joint, and the outlet joint is located at the upper part of the main body and is connected with the central pipe to form a return liquid channel; the inlet joint is positioned below the outlet joint, and forms an inlet channel with an annular space formed by the outlet joint and the main body; the concentric pipe female buckle joint is connected with a concentric oil pipe; the concentric oil pipe comprises an inner pipe, and the inner pipe is connected with an outer pipe through a fixing flange. According to the utility model, the continuous negative pressure device is adopted, so that sand grains in the shaft can be sucked and cleaned up under the condition that the pressure of an oil layer is very low, the construction efficiency is high, the construction speed is high, and secondary pollution to the oil layer is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production engineering, in particular to a continuous negative pressure sand flushing pipe column device. Background Art

[0002] In the process of oil production, oil and water wells often get clogged and cannot produce oil and inject water normally. The main reason for the blockage of oil wells is that sand particles in the oil layer enter the oil well with the oil flow and gradually settle into the wellbore. The main reason for the blockage of water wells is the pressure fluctuation during water injection, which causes the sand particles in the oil layer to be spit out and deposited into the wellbore. For high-pressure wells, the conventional positive sand flushing method can be used to solve the problem.

[0003] However, for low-pressure wells, the positive sand flushing method is less effective or even impossible to implement. The flushing fluid injected into the well cannot be returned to the surface, and the sand in the wellbore cannot be carried out of the wellhead. It will also cause secondary pollution to the oil layer, and it takes a long time to drain the flushing fluid injected into the oil layer. To deal with such oil and water wells, negative pressure sand flushing methods are needed to solve the problem. Utility Model Content

[0004] In order to make up for the above deficiencies, the utility model provides a continuous negative pressure sand flushing pipe column device, aiming to improve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a continuous negative pressure sand flushing pipe string device, including a tee and a self-sealing wellhead. The self-sealing wellhead is installed, and then a negative pressure sand flushing pump and a concentric oil pipe are inserted one by one. After reaching the vicinity of the sand surface, a tee is installed on the concentric oil pipe and connected to the water inlet and return pipelines.

[0006] Furthermore, the tee comprises a main body and an outlet joint, wherein the outlet joint is located at the upper part of the main body and is connected to the central pipe to form a return liquid channel.

[0007] Further, the inlet joint is located below the outlet joint, and an annular space formed by the outlet joint and the main body forms an inlet channel.

[0008] Further, the concentric tube female buckle joint is connected to the concentric oil pipe.

[0009] Furthermore, the concentric oil pipe includes an inner pipe, and the inner pipe is connected to the outer pipe through a fixed flange.

[0010] Furthermore, the negative pressure sand flushing pump comprises a throat pipe, and the throat pipe and the upper nozzle are installed in the upper joint.

[0011] Furthermore, the lower nozzle is mounted on the mounting joint and connected to the upper joint via the mounting joint.

[0012] Furthermore, the upper part of the filter is connected to the mounting joint, and the lower part is connected to the tamping cone.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, a continuous negative pressure device is adopted, which can clean up the sand in the wellbore by suction when the oil layer pressure is very low, with high construction efficiency and fast construction speed, and will not cause secondary pollution to the oil layer.

[0015] 2. In the utility model, the blockage removal operation can be realized regardless of whether it is a vertical well, an inclined well or a horizontal well. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a continuous negative pressure sand flushing pipe column device proposed by the utility model;

[0017] Figure 2 This is a schematic diagram of a three-way structure of a continuous negative pressure sand flushing pipe column device proposed by the utility model;

[0018] Figure 3 This is a schematic diagram of the concentric tube structure of a continuous negative pressure sand flushing pipe column device proposed by the utility model;

[0019] Figure 4 The utility model discloses a negative pressure sand flushing pump structure schematic diagram of a continuous negative pressure sand flushing pipe string device.

[0020] Legend:

[0021] 1. Tee; 101. Main body; 102. Outlet joint; 103. Inlet joint; 104. Concentric tube female buckle joint; 2. Concentric oil pipe; 201. Outer tube; 202. Inner tube; 203. Fixed flange; 3. Self-sealing wellhead; 4. Negative pressure sand flushing pump; 401. Upper joint; 402. Throat; 403. Upper nozzle; 404. Installation joint; 405. Lower nozzle; 406. Filter; 407. Tamping cone. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Reference Figure 1 - Figure 4The utility model provides an embodiment: a continuous negative pressure sand flushing pipe column device, including a tee 1 and a self-sealing wellhead 3, by installing the self-sealing wellhead 3, and then gradually inserting a negative pressure sand flushing pump 4 and a concentric oil pipe 2, after reaching the vicinity of the sand surface, the tee 1 is installed on the concentric oil pipe 2, and connected to the water inlet and return pipelines; the tee 1 includes a main body 101 and an outlet joint 102, the outlet joint 102 is located at the upper part of the main body 101, and is connected to the central pipe to form a return liquid channel; the inlet joint 103 is located below the outlet joint 102, and is connected to the outlet joint 102 The annular space formed with the main body 101 forms an inlet channel; the concentric tube female buckle joint 104 is connected to the concentric oil pipe 2; the concentric oil pipe 2 includes an inner tube 202, and the inner tube 202 is connected to the outer tube 201 through a fixed flange 203; the negative pressure sand flushing pump 4 includes a throat 402, and the throat 402 and the upper nozzle 403 are installed in the upper joint 401; the lower nozzle 405 is installed on the installation joint 404, and is connected to the upper joint 401 through the installation joint 404; the upper part of the filter 406 is connected to the installation joint 404, and the lower part is connected to the tamping cone 407;

[0024] Specifically, the connections are made in order from bottom to top: install the self-sealing wellhead 3, lower the negative pressure sand flushing pump 4, and the concentric oil pipe 2, and connect the tee 1 for sand flushing. The high-pressure well flushing fluid generated by the well washing truck enters the inner tube 202 of the concentric oil pipe 2 through the inlet 103 of the tee 1, and goes straight down to the negative pressure sand flushing pump 4. 2 / 3 of the liquid passes through the jet mechanism formed by the upper nozzle and the throat, generating a negative pressure suction force under the pump, and the turbid liquid sucked up is mixed with the high-pressure well flushing fluid and lifted up, and returns through the annulus between the inner and outer pipes of the concentric oil pipe, and enters the pollution tanker through the outlet of the tee; the other 1 / 3 of the liquid impacts the sand surface downward through the lower nozzle, crushing and stirring the sediment at the bottom of the well and the water to form a turbid liquid, so that the pump can suck it away. The tamping cone 407 can complete the sand crushing work by mechanically hitting the sand surface.

[0025] Working principle: First, install the self-sealing wellhead 3, then lower the negative pressure sand flushing pump 4 and concentric oil pipe 2 from bottom to top, and connect the sand flushing tee 1 until the negative pressure sand flushing pump reaches the vicinity of the sand surface. Regardless of whether the sand flushing pipe column is lowered or lifted, the rubber seal in the self-sealing wellhead 3 always plays a self-sealing role on the pipe column. The higher the pressure, the tighter the seal. The self-sealing wellhead 3 is prepared by the operation team. The high-pressure well-washing fluid enters the inner tube 202 of the concentric oil pipe 2 through the inlet 103 of the tee 1, and goes down to the sand flushing pump 4. 2 / 3 of the liquid passes through the jet mechanism formed by the upper nozzle and the throat, generating negative pressure suction force under the pump, and mixes the sucked turbid liquid with the high-pressure well-washing fluid and lifts it up, returns through the annulus between the inner and outer pipes of the concentric oil pipe, and enters the pollution tanker through the outlet 102 of the tee; the other 1 / 3 of the liquid impacts the sand surface downward through the lower nozzle, crushing and stirring the bottom sand and water to form a turbid liquid, so that the pump can suck it away. For relatively hard sediment, the method of tamping cone impact can be used to crush it. After the well-washing fluid enters the pollution tank, the sand particles settle to the bottom of the tank, and the liquid is pressurized again and enters the inlet of the tee 103. This cycle is repeated, and the sediment in the wellbore is finally cleaned.

[0026] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous negative pressure sand flushing pipe string device, comprising a tee (1) and a self-sealing wellhead (3), characterized in that: A self-sealing wellhead (3) is installed, and then a negative pressure sand flushing pump (4) and a concentric oil pipe (2) are inserted one by one. After reaching the vicinity of the sand surface, a tee (1) is installed on the concentric oil pipe (2), and the water inlet and return pipelines are connected.

2. A continuous negative pressure sand flushing pipe column device according to claim 1, characterized in that: The tee (1) comprises a main body (101) and an outlet joint (102). The outlet joint (102) is located at the upper part of the main body (101) and is connected to the central pipe to form a return liquid channel.

3. A continuous negative pressure sand flushing pipe column device according to claim 2, characterized in that: The inlet joint (103) is located below the outlet joint (102), and forms an inlet channel with the annular space formed by the outlet joint (102) and the main body (101).

4. A continuous negative pressure sand flushing pipe column device according to claim 3, characterized in that: The concentric tube female buckle joint (104) is connected to the concentric oil pipe (2).

5. A continuous negative pressure sand flushing pipe column device according to claim 4, characterized in that: The concentric oil pipe (2) comprises an inner pipe (202), and the inner pipe (202) is connected to the outer pipe (201) via a fixing flange (203).

6. A continuous negative pressure sand flushing pipe column device according to claim 1, characterized in that: The negative pressure sand flushing pump (4) comprises a throat pipe (402), and the throat pipe (402) and the upper nozzle (403) are installed in the upper joint (401).

7. A continuous negative pressure sand flushing pipe column device according to claim 6, characterized in that: The lower nozzle (405) is mounted on the mounting joint (404) and connected to the upper joint (401) via the mounting joint (404).

8. The continuous negative pressure sand flushing pipe column device according to claim 7, characterized in that: The filter (406) is connected to the mounting joint (404) at its upper portion and to the tamping cone (407) at its lower portion.

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