Wellhead device for testing eccentricity of oil well
By designing an oil well eccentric test wellhead device, the problem of difficulty in conducting static and dynamic data testing in the oil well well in the existing technology is solved, and accurate testing is carried out during the oil well production process, without affecting the oil well production, and providing reliable data for the pumping well.
Patent Information
- Application Number
- CN202422053460.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-23
AI Technical Summary
It is difficult for the existing technology to conduct static and dynamic data testing in oil wells, resulting in the inability to accurately calculate data such as the oil wells' production index and other data, and the impossible to formulate the best development plan.
Design an eccentric test wellhead device for oil wells, including a bar, sealer, eccentric body, eccentric seat, eccentric valve, bearing, sealing ring, large four-way, oil pipe column, bottom flange and casing, and realize downward entry and data acquisition of the test instrument through eccentric body and vertical testing holes.
It realizes static and dynamic data testing during the oil well production process, which does not affect oil well production, and provides reliable data for the best development plan for pumping wells, which has significant economic benefits.
Smart Images
Figure CN222936707U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of oilfield oil production, and is an eccentric test wellhead device for oil wells. Background Technique
[0002] At present, the vast majority of oil production wells in China use sucker rods pumps for production. Sucker rod pump production means lowering the pump barrel of the sucker rod pump to the designed position with a pipe string, and then lowering the piston of the sucker rod pump into the pump barrel with a sucker rod. Therefore, after the sucker rod pipe string is lowered into the well, it is impossible to lower the test instrument into the well through the inside of the pipe string for downhole testing. The dynamic pressure of the oil well can only be converted with the dynamic liquid level, but due to the different physical properties such as the water content and density of the crude oil, the accuracy of the oil well data converted is not enough. Sometimes, in order to obtain more accurate data, only the pipe string in the well needs to be completely pulled out, and then the test instrument is lowered into the oil layer part of the well for testing. This test method requires the oil well to stop production for construction, which takes a long time and costs a lot. Since the test is carried out in a shutdown state, only static data can be measured, and dynamic data cannot be measured. Data such as the liquid production index of the oil well cannot be calculated, and the optimal development plan for the sucker rod well cannot be formulated. Content of the Utility Model
[0003] The purpose of the utility model is to design an eccentric test wellhead device for oil wells in view of the above problems existing in the existing technology, so that the static and dynamic data of the oil well can be measured in the well where the sucker rod pipe string is lowered, and reliable data can be provided for formulating the optimal development plan for the sucker rod well.
[0004] The object of the utility model is realized as follows: It includes a polished rod, a packer, an eccentric body, an eccentric seat, an eccentric valve, a bearing, an upper sealing ring, a lower sealing ring, a large four-way joint, a tubing string, a bottom flange, and a casing. The bottom flange is installed on the upper part of the casing, the large four-way joint is installed on the bottom flange, the bearing is installed inside the upper part of the eccentric seat, and the lower end of the bearing sits on the upper inner shoulder of the eccentric seat. The eccentric seat is installed on the large four-way joint, and there is an oil outlet hole on the middle side of the eccentric seat. The eccentric body has a vertical oil outlet channel and a vertical test hole. The axes of the vertical oil outlet channel and the vertical test hole are not coaxial with the axis of the eccentric body. There is a reduced diameter section in the middle of the eccentric body, and an oil outlet groove is opened on the reduced diameter section. The oil outlet groove communicates with the vertical oil outlet channel. The upper sealing ring and the lower sealing ring are installed in the grooves on the outer wall of the eccentric body. The upper sealing ring is above the reduced diameter section, and the lower sealing ring is below the reduced diameter section. The tubing thread at the lower part of the eccentric body is connected to the upper tubing thread of the tubing string. The eccentric body is installed inside the eccentric seat. The tubing string passes through the large four-way joint and the bottom flange and extends into the casing. The upper shoulder of the eccentric body sits on the bearing. The oil outlet groove communicates with the oil outlet hole. The upper sealing ring is above the oil outlet hole, and the lower sealing ring is below the oil outlet hole, so that the inside of the large four-way joint does not communicate with the oil outlet hole. The diameter of the vertical test hole is 2 - 10 mm larger than the diameter of the test instrument. The projection of the vertical test hole is inside the casing. The upper end of the vertical test hole is installed with an eccentric valve. The polished rod extends into the eccentric body and the tubing string. The packer is sleeved on the polished rod and its lower part is connected to the upper end of the vertical oil outlet channel.
[0005] The beneficial effects of the utility model are as follows: The tubing string is a common tubing. The projection of the vertical test hole is inside the casing and its diameter is larger than the diameter of the test instrument. Therefore, the test instrument can be lowered into the oil layer part of the well through the space between the casing and the tubing string for accurate testing. The test device is on one side of the polished rod and will not affect the production of the oil well during testing. It can measure the production data of the oil well during the production and shutdown processes of the oil well, provide reliable data for formulating the best development plan for the pumping well, and provide guarantee for the effective development of the oilfield, with significant economic benefits. Description of the Drawings
[0006] Figure 1 It is the structural diagram of the utility model. Detailed Embodiment
[0007] The following Figure 1 describes the embodiments of the utility model in conjunction with the attached
[0008] As Figure 1As shown in the figure, the embodiments of the present utility model include a polished rod 1, a packer 2, an eccentric body 3, an eccentric seat 4, an eccentric valve 5, a bearing 7, an upper sealing ring 8, a lower sealing ring 9, a large four-way joint 10, a tubing string 11, a bottom flange 12, and a casing 13. The bottom flange 12 is installed on the upper part of the casing 13, the large four-way joint 10 is installed on the bottom flange 12, the bearing 7 is installed inside the upper part of the eccentric seat 4, and the lower end of the bearing 7 sits on the upper inner shoulder of the eccentric seat 4. The eccentric seat 4 is installed on the large four-way joint 10. There is an oil outlet hole 4-1 on the middle side of the eccentric seat 4. The vertical oil outlet channel 3-1 and the vertical test hole 3-3 are provided on the eccentric body 3. The axes of the vertical oil outlet channel 3-1 and the vertical test hole 3-3 are not coaxial with the axis of the eccentric body 3. There is a reduced diameter section 3-4 in the middle of the eccentric body 3. An oil outlet groove 3-2 is opened on the reduced diameter section 3-4. The oil outlet groove 3-2 communicates with the vertical oil outlet channel 3-1. The upper sealing ring 8 and the lower sealing ring 9 are installed in the grooves on the outer wall of the eccentric body 3. The upper sealing ring 8 is above the reduced diameter section 3-4, and the lower sealing ring 9 is below the reduced diameter section 3-4. The tubing thread at the lower part of the eccentric body 3 is connected to the upper tubing thread of the tubing string 11. The eccentric body 3 is installed in the eccentric seat 4. The tubing string 11 passes through the large four-way joint 10 and the bottom flange 12 and extends into the casing 13. The upper shoulder of the eccentric body 3 sits on the bearing 7. The oil outlet groove 3-2 communicates with the oil outlet hole 4-1. The upper sealing ring 8 is above the oil outlet hole 4-1, and the lower sealing ring 9 is below the oil outlet hole 4-1, so that the inside of the large four-way joint 10 does not communicate with the oil outlet hole 4-1. The diameter of the vertical test hole 3-3 is 2-10 mm larger than the diameter of the test instrument. The projection of the vertical test hole 3-3 is inside the casing 13. The eccentric valve 5 is installed at the upper end of the vertical test hole 3-3. The polished rod 1 extends into the eccentric body 3 and the tubing string 11. After the packer 2 is sleeved on the polished rod 1, its lower part is connected to the upper end of the vertical oil outlet channel 3-1. The upper part of the polished rod 1 is connected to the pumping unit, the lower part of the polished rod 1 is connected to the sucker rod string, and the lower part of the sucker rod string is connected to the piston of the submersible pump.
[0009] Opening the reduced diameter section 3-4 can ensure that there is enough communication channel between the vertical oil outlet channel 3-1 and the oil outlet hole 4-1 even if the oil outlet groove 3-2 is not opposite to the oil outlet hole 4-1.
[0010] A compression nut 6 is installed on the upper part of the eccentric seat 4. The inner diameter of the compression nut 6 is smaller than the outer diameter of the upper shoulder of the eccentric body 3, so that the eccentric body 3 cannot move upward. A sealing ring is installed between the eccentric body 3 and the eccentric seat 4, so that the lubricating oil in the bearing 7 will not flow out, and it also ensures that sundries will not enter the bearing 7.
[0011] When not in testing, the eccentric valve 5 is in a closed state. During testing, a testing device is installed on the eccentric valve 5, and then the eccentric valve 5 is opened to conduct the test. The testing device is on one side of the polished rod 1 and will not affect the production of the oil well during testing.
[0012] During oil pumping, the well fluid passes upward through the vertical oil outlet channel 3-1 via the tubing string 11 and flows out from the oil outlet hole 4-1.
Claims
1. An oil well eccentricity test wellhead device, comprising a polished rod (1), a sealer (2), an eccentric body (3), an eccentric seat (4), an eccentric valve (5), a bearing (7), an upper sealing ring (8), a lower sealing ring (9), a large cross-piece (10), an oil pipe string (11), a bottom flange (12), and a casing (13), wherein the bottom flange (12) is mounted on the upper part of the casing (13), and the large cross-piece (10) is mounted on the bottom flange (12), wherein: The bearing (7) is installed in the upper part of the eccentric seat (4), and the lower end of the bearing (7) is seated on the upper inner shoulder of the eccentric seat (4). The eccentric seat (4) is installed on the large four-way (10). The middle side of the eccentric seat (4) has an oil outlet hole (4-1). The eccentric body (3) has a vertical oil outlet channel (3-1) and a vertical test hole (3-3). The axis of the vertical oil outlet channel (3-1) and the vertical test hole (3-3) are not coaxial with the axis of the eccentric body (3). A reduced diameter section (3-4) is provided in the middle, an oil outlet groove (3-2) is provided on the reduced diameter section (3-4), the oil outlet groove (3-2) is communicated with the vertical oil outlet channel (3-1), an upper sealing ring (8) and a lower sealing ring (9) are installed in the groove on the outer wall of the eccentric body (3), the upper sealing ring (8) is located above the reduced diameter section (3-4), the lower sealing ring (9) is located below the reduced diameter section (3-4), and the oil pipe thread at the lower part of the eccentric body (3) is connected to the oil pipe column (11) The upper oil pipe is threadedly connected, the eccentric body (3) is installed in the eccentric seat (4), the oil pipe column (11) passes through the large four-way (10), the bottom flange (12) is placed in the casing (13), the upper shoulder of the eccentric body (3) sits on the bearing (7), the oil outlet groove (3-2) is connected to the oil outlet hole (4-1), the upper sealing ring (8) is located above the oil outlet hole (4-1), and the lower sealing ring (9) is located below the oil outlet hole (4-1), so that the large four-way (10) is The part is not connected to the oil outlet hole (4-1), the diameter of the vertical test hole (3-3) is 2-10 mm larger than the diameter of the test instrument, the projection of the vertical test hole (3-3) is in the casing (13), an eccentric valve (5) is installed at the upper end of the vertical test hole (3-3), the bare rod (1) is below the eccentric body (3) and the oil pipe column (11), and the sealer (2) is sleeved on the bare rod (1) and its lower part is connected to the upper end of the vertical oil outlet channel (3-1).