Screw pump well completion pipe string pressure testing device
By designing a screw pump completion pipe column pressure test device, including the pump oil pipe, adjustment pipe and sealing body, the problem of unsmooth entry of the screw pump rotor into the stator is solved, and it is used in conjunction with the rotary anchor to achieve pressure test Accuracy and quality assurance, suitable for a wide range of well casing sizes.
Patent Information
- Application Number
- CN202420555727.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-21
AI Technical Summary
The existing screw pump oil pipe string pressure test device cannot ensure that the screw pump rotor is smoothly lowered into the stator, and cannot be used with the rotary anchored anchor, resulting in inconvenient pressure testing and no quality guarantee.
A screw pump completion pipe column pressure test device is designed, including pump oil pipe, adjustment pipe, sealing seat and sealing body. The sealing body is equipped with a connecting shaft, sealing member and compression sleeve to ensure sealing and rotation. The anchoring device is used in conjunction with the method.
The screw pump rotor is successfully lowered into the stator, ensuring the pressure test in the closed state of the oil pipe on the pump, improving the accuracy and quality of the pressure test, and avoiding oil pipe leakage. It is suitable for oil wells of various casing sizes.
Smart Images
Figure CN222253937U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil well equipment, in particular to a screw pump completion string pressure testing device. Background Art
[0002] In the screw pump oil pumping string, the check valve cannot be installed at the bottom of the screw pump, because if the check valve is installed, when the screw pump rotor is lowered into the screw pump stator, the liquid between the check valve and the rotor cannot be discharged (the liquid is incompressible), and the rotor cannot enter the stator. Therefore, the check valve cannot be installed at the bottom of the screw pump. Therefore, the lower part of the screw pump oil pumping string cannot be closed, and the pressure cannot be tested after the string is lowered, and it is impossible to find out whether the oil pipe is leaking, and the quality of the operation cannot be guaranteed.
[0003] In order to solve the above problems, technicians have developed a variety of screw pump pressure testing devices, but all of them have some shortcomings.
[0004] For example, the prior art discloses a patent CN2816415, which is named a screw pump and can be used to test the pressure of the screw pump production pipe. However, this screw pump needs to be modified and requires an outer pipe that is longer than the screw pump, which has high material costs. If the well washing pressure isolation valve is not closed, leakage will not occur.
[0005] For another example, the prior art discloses a patent CN201318266, which is named as a testable pressure screw pump. It is necessary to install a discharge pipe in parallel outside the screw pump. In addition to the problems existing in the above patents, there is also the problem of increasing the size of the screw pump, so that it cannot be put into the commonly used casing, and the use range of the screw pump is reduced. As stated in the last paragraph of the specification of the testable pressure screw pump of Chinese patent 200820173260.9, "The utility model can only be used in a 7" casing, because after the discharge pipe is installed in parallel outside the pump, the size of the pump increases and cannot be put into a small casing", while the casing of most oil wells in China is 5 1 / 2″ casing, so the application scope of this technology is small and cannot meet the pressure testing needs of most oil wells.
[0006] For another example, the prior art discloses a patent CN212177123U, entitled a screw pump completion string pressure test device, which has the problem of being impossible to implement. The patent states in paragraph
[0061] that "In the present utility model, the device body 1 is lowered into the well together with the screw pump completion string, and hydraulic pressure is pumped into the oil pipe by a pump truck to a positive pressure of 10 MPa, and the pressure is stabilized for 15 minutes. When the pressure does not drop, it indicates that the pressure in the oil pipe is qualified. When the pressure in the oil pipe is qualified, the screw pump completion string is lifted up, the screw pump completion string is rotated, the first connector rotates with the screw pump completion string, and the push rod is displaced toward the valve ball side until the valve ball is pushed open to achieve oil leakage." In fact, when the screw pump completion string is rotated, the second connector must also rotate with the screw pump completion string. If the first connector rotates with the screw pump completion string, then the entire device has no relatively rotating parts, and the push rod cannot be displaced toward the valve ball side, so it cannot achieve oil leakage. If oil leakage cannot be achieved, the problem of "the rotor cannot enter the stator" will occur.
[0007] For another example, the prior art discloses a patent CN2628708, which is named as a screw pump oil production tubing pressure test device, which can test the screw pump tubing pressure. It has the record of "after the pressure test is qualified, operate the tubing, anchor the tubing anchoring device on the casing, and then lower the tubing, the telescopic tube does not move, the distance between the valve ball and the push rod is shortened, the valve ball is pushed away from the valve seat, so that the tubing is connected from top to bottom, and the rotor can be smoothly lowered". That is to say, it should be used in conjunction with the lifting and lowering anchor (this anchor is improved from the packer). The lifting and lowering anchor is anchored by the weight of the tubing pressing on the anchor. Therefore, this type of anchor has the problem of tubing bending and rod pipe wear during operation. Therefore, this type of anchor is rarely used and can only be used in non-inclined wells (the weight of the tubing in the inclined well is dispersed to the well wall, and sufficient clamping force cannot be guaranteed). Therefore, most of the anchors currently used in screw pumps are rotary anchors.
[0008] As the existing devices including the above patents are used, the shortcomings of the technology are gradually exposed, which are mainly manifested in the following aspects:
[0009] In order to enable the existing device to perform pressure testing on the screw pump pumping string, it is impossible to ensure that the screw pump rotor is smoothly lowered into the screw pump stator, and it is impossible to be used in conjunction with the anchor of the rotary anchoring method.
[0010] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content
[0011] In view of the defects in the prior art, the utility model solves the problem that the device in the traditional technology cannot ensure that the screw pump rotor is smoothly lowered into the screw pump stator in order to perform pressure testing on the screw pump oil pumping pipe, and cannot be used in conjunction with the anchor of the rotary anchor.
[0012] In order to solve the above problems, the utility model provides the following technical solutions:
[0013] The screw pump completion string pressure testing device comprises a pump upper oil pipe and an adjusting pipe arranged in parallel from top to bottom, the lower end of the adjusting pipe is connected to the screw pump stator, a sealing seat is connected between the pump upper oil pipe and the adjusting pipe, a sealing body is arranged in the sealing seat, the lower end of the sealing body is connected to the screw pump rotor, when the screw pump rotor is in the screw pump stator to form a screw pump, the sealing body and the sealing seat are sealed, and the pipe string part above the sealing seat is closed.
[0014] As an optimized solution, the sealing body comprises a connecting shaft, on which a fixed-position sealing member is sleeved, and an outer wall of the sealing member is sealed against an inner wall of the sealing seat.
[0015] As an optimized solution, a compression sleeve is threadedly connected to the connecting shaft, and the lower end of the compression sleeve abuts against the upper end of the sealing member.
[0016] As an optimized solution, the connecting shaft is provided with a diameter-reducing section which abuts against the lower end of the sealing member.
[0017] As an optimized solution, the lower end of the connecting shaft is threadedly connected with an adjusting rod.
[0018] As an optimized solution, the lower end of the adjusting rod is connected to the screw pump rotor.
[0019] As an optimized solution, the upper end portion of the connecting shaft is threadedly connected with a rod joint.
[0020] As an optimized solution, the inner diameter of the regulating tube is larger than the major diameter of the screw pump rotor.
[0021] As an optimized solution, a pipe section having an inner diameter larger than the sum of the outer diameter of the sealing body and twice the eccentricity of the screw pump rotor is provided at the lower part of the oil pipe on the pump.
[0022] As an optimized solution, the seal is a copper seal or a nylon seal.
[0023] Compared with the prior art, the beneficial effects of the utility model are:
[0024] It can test the pressure of the screw pump oil pumping string, and ensure that the screw pump rotor is smoothly lowered into the screw pump stator, and overcome the above-mentioned problems, so that it can be used in conjunction with the anchor of the rotary anchoring method;
[0025] After the pipe string is lowered and is in a pump-collision state, the oil pipe on the pump is in a closed state and can be pressure tested. The utility model performs pressure testing only after the screw pump rotor is smoothly lowered into the screw pump stator (pressure testing after well completion). By pressure testing the screw pump completion string, the eligibility of the oil pipe on the pump can be determined, the completion quality can be guaranteed, and the influence of oil pipe leakage on production can be avoided, which has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.
[0027] Figure 1 It is a structural schematic diagram of the utility model;
[0028] Figure 2 It is a structural schematic diagram of the sealing body of the utility model.
[0029] In the figure: 1-oil pipe on the pump; 2-sealing body; 2.1-rod joint; 2.2-compression sleeve; 2.3-sealing element; 2.4-connecting shaft; 3-sealing seat; 4-adjusting rod; 5-adjusting tube; 6-screw pump stator; 7-screw pump rotor. DETAILED DESCRIPTION
[0030] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.
[0031] like Figure 1 and Figure 2 As shown, the screw pump completion string pressure testing device includes a pump upper oil pipe 1 and an adjusting pipe 5 arranged in parallel from top to bottom, the lower end of the adjusting pipe 5 is connected to the screw pump stator, a sealing seat 3 is connected between the pump upper oil pipe 1 and the adjusting pipe 5, a sealing body 2 is arranged in the sealing seat 3, and the lower end of the sealing body 2 is connected to the screw pump rotor 7. When the screw pump rotor 7 is in the screw pump stator 6 to form a screw pump, the sealing body 2 and the sealing seat 3 are sealed, and the part of the pipe string above the sealing seat 3 is closed.
[0032] The sealing body 2 comprises a connecting shaft 2.4, on which a fixed sealing member 2.3 is sleeved, and the outer wall of the sealing member 2.3 abuts against the inner wall of the sealing seat 3 for sealing.
[0033] A compression sleeve 2.2 is threadedly connected to the connecting shaft 2.4, and the lower end of the compression sleeve 2.2 abuts against the upper end of the sealing member 2.3.
[0034] The connecting shaft 2.4 is provided with a diameter reducing section which abuts against the lower end of the sealing member 2.3. The compression sleeve 2.2 presses the sealing member 2.3 so that the contact between the sealing member 2.3 and the connecting shaft 2.4 remains sealed.
[0035] The lower end of the connecting shaft 2.4 is threadedly connected with an adjusting rod 4.
[0036] The lower end of the adjusting rod 4 is connected to the screw pump rotor 7 .
[0037] The upper end of the connecting shaft 2.4 is threadedly connected with a rod joint 2.1.
[0038] The inner diameter of the adjusting tube 5 is larger than the major diameter of the screw pump rotor 7. When the screw pump rotor 7 enters the screw pump stator 6, it will rotate. During rotation, the eccentricity of the screw pump rotor 7 causes its rotation radius to be larger than its major diameter. The above arrangement is to eliminate the problem that the sealing body 2 cannot cooperate with the sealing seat 3 for sealing due to the eccentricity.
[0039] A pipe section whose inner diameter is larger than the sum of the outer diameter of the sealing body 2 and twice the eccentricity of the screw pump rotor 7 is arranged at the lower part of the oil pipe 1 on the pump, so that the sealing body 2 does not generate a jam when rotating with the screw pump rotor 7.
[0040] The lengths of the adjusting tube 5 and the adjusting rod 4 meet the requirement that the sealing body 2 can sit on the sealing seat 3 only after the screw pump rotor 7 completely enters the screw pump stator 6 .
[0041] The seal 2.3 is a copper seal 2.3 or a nylon seal 2.3.
[0042] The working principle of this device is:
[0043] It can test the pressure of the screw pump oil pumping string, and ensure that the screw pump rotor 7 is smoothly lowered into the screw pump stator 6, and overcome the above-mentioned problems, so that it can be used in conjunction with the anchor anchored in a rotating manner;
[0044] After the pipe string is lowered and is in the pump-collision state, the oil pipe 1 on the pump is in a closed state and can be pressure tested. The utility model performs pressure testing only after the screw pump rotor 7 is smoothly lowered into the screw pump stator 6 (pressure testing after completion). By pressure testing the screw pump completion string, the eligibility of the oil pipe 1 on the pump can be determined, the completion quality can be guaranteed, and the influence of oil pipe leakage on production can be avoided, which has significant economic benefits.
[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.
Claims
1. A screw pump completion string pressure test device, comprising a pump upper oil pipe (1) and a regulating pipe (5) arranged in parallel from top to bottom, wherein the lower end of the regulating pipe (5) is connected to a screw pump stator, and is characterized in that: A sealing seat (3) is connected between the oil pipe (1) on the pump and the regulating pipe (5), a sealing body (2) is arranged inside the sealing seat (3), a screw pump rotor (7) is connected to the lower end of the sealing body (2), and when the screw pump rotor (7) is in the screw pump stator (6) to form a screw pump, the sealing body (2) and the sealing seat (3) are sealed, and the pipe column part above the sealing seat (3) is closed.
2. The screw pump completion string pressure testing device according to claim 1, characterized in that: The sealing body (2) comprises a connecting shaft (2.4), on which a fixed-position sealing member (2.3) is sleeved, and the outer wall of the sealing member (2.3) is sealed against the inner wall of the sealing seat (3).
3. The screw pump completion string pressure testing device according to claim 2 is characterized in that: A compression sleeve (2.2) is threadedly connected to the connecting shaft (2.4), and the lower end of the compression sleeve (2.2) abuts against the upper end of the sealing member (2.3).
4. The screw pump completion string pressure testing device according to claim 2, characterized in that: The connecting shaft (2.4) is provided with a diameter-reducing section which abuts against the lower end of the sealing member (2.3).
5. The screw pump completion string pressure testing device according to claim 2, characterized in that: The lower end of the connecting shaft (2.4) is threadedly connected with an adjusting rod (4).
6. The screw pump completion string pressure testing device according to claim 5, characterized in that: The lower end of the adjusting rod (4) is connected to the screw pump rotor (7).
7. The screw pump completion string pressure testing device according to claim 2, characterized in that: The upper end of the connecting shaft (2.4) is threadedly connected with a rod joint (2.1).
8. The screw pump completion string pressure testing device according to claim 1, characterized in that: The inner diameter of the regulating tube (5) is greater than the major diameter of the screw pump rotor (7).
9. The screw pump completion string pressure testing device according to claim 1, characterized in that: The lower part of the oil pipe (1) on the pump is provided with a pipe section whose inner diameter is larger than the sum of the outer diameter of the sealing body (2) and twice the eccentricity of the screw pump rotor (7).
10. The screw pump completion string pressure testing device according to claim 2, characterized in that: The sealing member (2.3) is a copper sealing member (2.3) or a nylon sealing member (2.3).