Tubeless negative pressure multilayer dynamic testing device

Abstract

A kind of pipeless negative pressure multilayer dynamic testing device, it is related to oil exploitation testing field, including several packers and several testing tools, packer and testing tool are connected in the string below pumping unit with interval, two adjacent packers isolate test layer with other layers, because the testing tool between two adjacent packers is only corresponding with the test layer, so the test layer output crude oil must pass the testing tool to reach pumping unit upward, therefore, the utility model can obtain the key data of each oil production layer under pumping condition, compared with prior art means-static test, the utility model is more conducive to real judgment oil layer productivity.In addition, two adjacent packers isolate test layer with other layers, under the isolation of two packers, the suction of pumping unit generates negative pressure to the test layer, negative pressure forces oil layer to produce oil.

Description

Technical Field

[0001] This utility model belongs to the field of oil extraction testing technology, and in particular relates to a tubeless negative pressure multi-layer dynamic testing device. Background Technology

[0002] Testing key data from each oil-producing layer of an oil well (such as production rate and pressure drop rate) is an important basis for judging the oil production capacity of the layer. By adjusting the operating system (such as pump hanger depth and discharge rate) based on the test results, the oil well can be operated under optimal conditions, reducing energy consumption and increasing production.

[0003] Existing oil well testing can only be conducted under static conditions. Data from static conditions deviates from data from data from dynamic conditions (during pumping), making it difficult to accurately assess reservoir productivity. Furthermore, current technology only allows for single-layer testing, resulting in low efficiency. Utility Model Content

[0004] To achieve multi-layer and dynamic testing of oil wells, this invention provides a pipeless negative pressure multi-layer dynamic testing device. The device consists of packers and testing tools connected sequentially and at intervals below the pump. The packers isolate each oil-producing layer, and the produced oil from each layer enters from the side of the testing tool and flows out from the top. As the crude oil flows through the testing instrument inside the tool, key data from different oil-producing layers are collected. Therefore, this invention not only enables testing of oil-producing layers under dynamic conditions but also achieves multi-layer simultaneous testing, significantly improving testing efficiency.

[0005] The technical solution provided by this utility model is: a tubeless negative pressure multi-layer dynamic testing device, comprising several packers and several testing tools. The packers and testing tools are sequentially and alternately connected to the tubing string below the oil pump. No tubing is installed above the oil pump; only a sucker rod is installed. The oil pump is securely anchored downhole using a slip packer. The testing tools include an upper connector A, an outer tube, a lower connector A, a central tube A, a valve cover, and a sliding sealing core. The upper connector A, the outer tube, and the lower connector A are sequentially threaded together. The lower connector A has an axial blind hole in its upper center and a radial blind hole on its side. The axial blind hole and the radial blind hole communicate to form a fluid inlet channel, through which crude oil enters the well. The test tool is inserted into the central tube A, which is sealed to the upper end of the lower connector A. The two ends of the central tube A are respectively provided with an upper limit orifice plate and a lower limit orifice plate. A tester is set between the upper limit orifice plate and the lower limit orifice plate. Crude oil flows through the periphery of the tester. A valve cover is sealed and connected to the upper part of the central tube A. A valve pair is fixedly set in the center of the valve cover. In the initial state, the sliding sealing core is installed in the valve pair and connected to the valve pair through the shear pin A. The lower connector A is also machined with an axially eccentric through hole. There is an annular cavity between the central tube A and the outer tube. The eccentric through hole and the annular cavity are connected to form a flow channel. The crude oil of the next test layer flows to the oil pump through the flow channel.

[0006] A further technical solution is as follows: springs are respectively provided between the tester and the upper limit hole plate and the lower limit hole plate. The elastic extension and contraction of the springs allows for the adaptive installation of testers of different lengths. At least one of the two limit hole plates is detachably connected to the central tube A. The tester can only be placed in after the limit hole plate is detached.

[0007] A further technical solution is as follows: a lead screw is connected to the top of the valve cover, and a lead screw straightening block is provided inside the upper connector A. The lead screw straightening block is used to straighten the lead screw. A threaded retaining sleeve is provided at the upper end of the upper connector A. The threaded retaining sleeve does not move relative to the upper connector A. By rotating the lead screw, the valve cover together with the central tube A can be removed, thereby facilitating the insertion, replacement or removal of the testing instrument.

[0008] A further technical solution is as follows: The packer includes an upper connector B, a central tube B, a lower connector B, a rubber sleeve, a one-way valve, and a release shear pin. The upper connector B, the central tube B, and the lower connector B are sequentially threaded together. The rubber sleeve is fitted onto the central tube B. An upper rubber sleeve is sealed to the upper end of the rubber sleeve, and a lower rubber sleeve is sealed to the lower end of the rubber sleeve. The upper rubber sleeve is sealed to the upper connector B and connected by the release shear pin. The lower rubber sleeve is slidably sealed to the central tube B. The one-way valve is located axially above the upper connector B. The liquid entering through the one-way valve enters between the rubber sleeve and the central tube B, thereby expanding and sealing the rubber sleeve.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] This invention involves sequentially and alternately installing several packers and several testing tools in a tubing string below the pump. Two adjacent packers separate the test layer from other layers. Crude oil produced from each test layer must pass through the testing tool before reaching the pump. Therefore, this invention can acquire key data for each oil-producing layer during pumping. Compared to static testing, this invention is more conducive to accurately determining the oil layer's production capacity. Furthermore, each testing tool corresponds to one test layer. Since multiple testing tools can be connected to a single tubing string, this invention allows for simultaneous multi-layer dynamic testing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the testing tool in this utility model.

[0012] Figure 2 This is a schematic diagram of the packer in this utility model.

[0013] In the diagram: 1. Lead screw; 2. Upper connector A; 3. Outer tube; 4. Valve cover; 5. Sliding sealing core; 6. Valve pair; 7. Shear pin A; 8. Upper limit orifice plate; 9. Spring; 10. Central tube A; 11. Tester; 12. Lower limit orifice plate; 13. Snap ring; 14. Limiting sleeve; 15. Lower connector A; 16. Liquid inlet channel; 17. Flow channel; 18. Lead screw straightener; 19. Upper connector B; 20. Unsealing shear pin; 21. Upper glue sleeve; 22. Central tube B; 23. Glue sleeve; 24. Lower glue sleeve; 25. Lower connector B; 26. Check valve. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0015] This embodiment is a tubeless negative pressure multilayer dynamic testing device. Structurally, it includes several packers and several testing tools. The packers and testing tools are sequentially and intermittently connected to the tubing below the oil pump. Two adjacent packers separate the test layer from other layers. Because the testing tool between two adjacent packers has a unique correspondence with the test layer, the crude oil produced in the test layer must pass through the testing tool to reach the oil pump. Therefore, this invention can obtain key data of each oil-producing layer under oil pumping conditions. Compared with the existing technology—static testing—this invention is more conducive to accurately judging the oil layer's production capacity.

[0016] In addition, two adjacent packers isolate the test layer from other layers. Under the sealing effect of the two packers, the suction effect of the oil pump generates negative pressure on the test layer, and the negative pressure causes the oil layer to produce oil.

[0017] In this invention, no tubing is required above the pump; only a sucker rod is installed. The pump is secured and anchored downhole using a slip packer. This embodiment, where no tubing is installed above the pump and only a sucker rod is used, is called tubing-free oil production. Tubing-free oil production is more suitable for testing operations because it eliminates the need for extensive tubing installation, significantly reducing workload and improving testing efficiency.

[0018] like Figure 1As shown, the testing tool includes an upper connector A2, an outer tube 3, a lower connector A15, a central tube A10, a valve cover 4, and a sliding sealing core 5. The upper connector A2, the outer tube 3, and the lower connector A15 are connected by threads in sequence. The lower connector A15 has an axial blind hole in the center of its upper part and a radial blind hole on its side. The axial blind hole and the radial blind hole are connected to form a liquid inlet channel 16. The crude oil of the test layer enters the testing tool through the liquid inlet channel 16. The lower end of the central tube A10 is sealed to the upper end of the lower connector A15. Specifically, the central tube A10 and the upper end of the lower connector A15 are plugged in and sealed by a sealing ring. To improve the stability of the connection, a retaining spring 13 is set between the two. The side wall of the lower connector is provided with a limiting sleeve 14 for limiting the movement of the central tube A10. An upper limit orifice plate 8 and a lower limit orifice plate 12 are respectively installed at both ends inside the central tube A10. A tester 11 is installed between the upper limit orifice plate 8 and the lower limit orifice plate 12. Crude oil flows from bottom to top through the periphery of the tester 11. During the flow, the tester 11 captures key data such as oil layer production and pressure drop rate. A valve cover 4 is sealed above the central tube A10. A valve pair 6 is fixedly installed in the center of the valve cover 4. In the initial state, the sliding sealing core 5 is sealed in the valve pair 6 and connected to the valve pair 6 through the shear pin A7. The purpose of the valve cover 4 in the initial state is to block the central channel of the entire tubing string to prevent the packer from accidentally setting. After the entire tubing string is lowered into place, the sliding sealing core 5 can be opened. The lower connector A15 is also machined with an axially eccentric through hole. There is an annular cavity between the central tube A10 and the outer tube 3. The eccentric through hole and the annular cavity are connected to form a flow channel 17. The crude oil of the next test layer flows to the pumping station through the flow channel 17. As can be seen, although multiple testing tools are connected on one tubing string of this utility model, each testing tool is provided with a flow channel 17 for the upward flow of crude oil from the test layer below. During the flow process in the flow channel 17, the crude oil does not pass through the testing instrument 11, thus enabling simultaneous multi-layer dynamic testing.

[0019] Springs 9 are respectively provided between the tester 11 and the upper limit plate 8 and the lower limit plate 12. The elastic extension and contraction of the springs 9 allows for the adaptive installation of testers 11 of different lengths, increasing the applicability of this utility model. At least one of the two limit plates is detachably connected to the central tube A10. The tester 11 can only be inserted after the limit plate is detached.

[0020] A lead screw 1 is connected to the top of the valve cover 4. A lead screw straightening block 18 is provided inside the upper connector A2 to straighten the lead screw 1. A threaded retaining sleeve is provided at the upper end of the upper connector A2. The threaded retaining sleeve is stationary relative to the upper connector A2. By rotating the lead screw 1, the valve cover 4 along with the central tube A10 can be removed, thus facilitating the insertion, replacement, or removal of the testing instrument 11. This utility model can be shipped without the testing instrument 11. After purchase, the user can insert a testing instrument 11 that meets their own needs.

[0021] like Figure 2 As shown, the packer includes an upper connector B19, a central tube B22, a lower connector B25, a rubber sleeve 23, a one-way valve 26, and a release shear pin 20. The upper connector B19, the central tube B22, and the lower connector B25 are connected in sequence by threads. The rubber sleeve is fitted onto the central tube B22. The upper end of the rubber sleeve 23 is sealed with an upper rubber sleeve 21, and the lower end of the rubber sleeve 23 is sealed with a lower rubber sleeve 24. The upper rubber sleeve 21 is sealed to the upper connector B19 and connected by the release shear pin 20. The lower rubber sleeve 24 is slidably sealed to the central tube B22. The one-way valve 26 is located axially above the upper connector B19. The liquid entering through the one-way valve 26 enters between the rubber sleeve 23 and the central tube B22, thereby expanding and sealing the rubber sleeve 23.

[0022] The principle of this utility model is:

[0023] 1. Connect the oil pump, packer, and measuring tools in sequence, and lower the sucker rod to the expected position. First, set the slip packer used to stabilize and anchor the oil pump. The slip packer should be set mechanically (not hydraulically).

[0024] 2. Hydraulic pressure is applied to the casing. The hydraulic pressure enters the tubing string below the pump. Driven by the hydraulic pressure, the sliding sealing core 5 on the testing tool tends to slide downwards, eventually shearing the shear pin A7. The sliding sealing core 5 then slides downwards, opening the central valve channel. Simultaneously, hydraulic pressure enters the annulus between the central tube B22 and the rubber sleeve 23 through the one-way valve 26. As the oil continues to enter, the rubber sleeve 23 expands, sealing the casing. Because the upper connector B19 uses the one-way valve 26, the rubber sleeve 23 remains sealed even without oil. To release the seal, simply lift the tubing string and shear the release shear pin 20 to release the oil and unseal the casing. After the sliding sealing core 5 opens and the rubber sleeve 23 is fully sealed, well completion and pumping can begin.

[0025] 3. After pumping begins, under the pressure of each formation, the crude oil mixture enters the corresponding layer's testing tool through the inlet channel 16, and the crude oil passes through the testing instrument 11 from bottom to top to achieve data capture.

[0026] In summary, this utility model's combination of packer and testing tools enables multi-layered dynamic testing, reflecting the true production state, simulating actual mining conditions (such as well opening), and directly acquiring data such as production rate and pressure drop rate to determine the oil reservoir's production capacity. By adjusting operating procedures (such as pump mounting depth and discharge rate) based on the test results, the well can be operated under optimal conditions, reducing energy consumption and increasing production.

Claims

1. A tubeless negative pressure multilayer dynamic testing device, characterized in that: The system includes a packer and a testing tool, which are sequentially and intermittently connected to the tubing below the pump. The testing tool includes an upper connector A (2), an outer tube (3), a lower connector A (15), a central tube A (10), a valve cover (4), and a sliding sealing core (5). The upper connector A (2), the outer tube (3), and the lower connector A (15) are sequentially threaded together. The lower connector A (15) has an axial blind hole in the upper center and a radial blind hole on its side. The axial blind hole and the radial blind hole communicate to form an inlet channel (16). The lower end of the central tube A (10) is sealed to the upper end of the lower connector A (15). 10) An upper limit orifice plate (8) and a lower limit orifice plate (12) are respectively set at both ends inside. A tester (11) is set between the upper limit orifice plate (8) and the lower limit orifice plate (12). A valve cover (4) is sealed and connected above the central tube A (10). A valve pair (6) is fixedly set in the center of the valve cover (4). In the initial state, the sliding sealing core (5) is sealed and installed in the valve pair (6) and connected to the valve pair (6) through the shear pin A (7). There is an annular cavity between the central tube A (10) and the outer tube (3). The lower connector A (15) is also machined with an axially eccentric through hole. The annular cavity and the eccentric through hole are connected to form a flow channel (17).

2. The tubeless negative pressure multilayer dynamic testing device according to claim 1, characterized in that: Springs (9) are respectively provided between the tester (11) and the upper limit hole plate (8) and the lower limit hole plate (12), so that testers (11) of different lengths can be installed adaptably. At least one of the two limit hole plates can be detachably connected to the central tube A (10).

3. The tubeless negative pressure multilayer dynamic testing device according to claim 1, characterized in that: The valve cover (4) is connected to a lead screw (1) on the top. The upper connector A (2) is provided with a lead screw straightening block (18), which is used to straighten the lead screw (1).

4. The tubeless negative pressure multilayer dynamic testing device according to claim 1, characterized in that: The packer includes an upper connector B (19), a central tube B (22), a lower connector B (25), a rubber sleeve (23), a one-way valve (26), and a release scissor (20). The upper connector B (19), the central tube B (22), and the lower connector B (25) are connected by threads in sequence. The rubber sleeve (23) is fitted onto the central tube B (22). The upper end of the rubber sleeve (23) is sealed with an upper rubber sleeve sleeve (21), and the lower end of the rubber sleeve (23) is sealed with a lower rubber sleeve sleeve (24). The upper rubber sleeve sleeve (21) is sealed with the upper connector B (19) and connected by the release scissor (20). The lower rubber sleeve sleeve (24) is slidably sealed with the central tube B (22). The one-way valve (26) is located axially on the upper connector B (19). The liquid entering the one-way valve (26) enters between the rubber sleeve (23) and the central tube B (22), thereby expanding and sealing the rubber sleeve (23).

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