Ground jet flow blocking removal test device and test method thereof

Abstract

The invention provides a ground jet flow blockage removal test device and method. The device comprises a connecting cylinder, a positioning mechanism, a nozzle assembly, a pressure detection assembly and a device supporting frame, and the connecting cylinder comprises an upper connector, a lower connector, an upper outer cylinder, a lower outer cylinder, a union and a sand scale plug pipe; the positioning mechanism comprises a hand-cranking push rod and a slide way; the pressure detection assembly comprises a pressure gauge and a pressure control box; the nozzle assembly is installed at the right end of the upper connector. The upper connector is installed on the upper outer cylinder in a threaded connection mode. The hand-cranking push rod is mounted in the lower joint; the lower joint is mounted on the lower outer cylinder through threaded connection; the sand dirt blocking pipe is in contact with the left end of the hand-cranking push rod; the device supporting frame comprises a sliding way and a Y-shaped filter. The device can realize ground remote monitoring of the pressurized jet test, is used for simulating the plugging removal effect of the jet in the test well, and greatly reduces the safety risk while observing the plugging removal effect in the ground test.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools in the oil and gas industry, and more specifically to a ground jet unblocking test device and a test method thereof. Background Art

[0002] Waxing, scaling, and sanding often occur in oil and gas production wells at home and abroad. Waxing and scaling cause serious blockage of the wellbore and prevent normal gas production, and even lead to well closure and production suspension. Sanding can easily lead to wear of the tubing in the well, and more seriously, it can cause sand jams. At present, the mainstream wax and scale removal methods are chemical and thermal wax removal combined with mechanical wax removal. The process is relatively complicated, and if leakage occurs, it will also cause formation pollution. At the same time, as oil and gas wells continue to deepen, the situation in the well becomes more difficult to observe, resulting in incomplete unblocking operations. Therefore, conventional wax and scale removal methods have great risks to the formation environment, and the complex construction procedures have led to increased costs. They have gradually failed to meet the requirements of on-site construction, and the construction effect is difficult to evaluate. Therefore, there is an urgent need for a test device that can complete the simulation of wax and scale removal operations on the ground and observe the actual unblocking effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a ground jet unblocking test device and a test method thereof, which can realize a ground pressurized jet unblocking test, be used to simulate the continuous oil pipe jet unblocking operation in the well, and be able to observe the unblocking effect after the jet unblocking is completed.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct a ground jet unblocking test device, including an upper joint, a nozzle assembly, an upper outer cylinder, an oil nozzle, a lower outer cylinder, a sand and dirt plugging pipe, a lower joint, a hand crank push rod, a pressure gauge, a pressure control box, a slideway, a Y-type filter and a device support frame;

[0005] The upper joint is connected to the upper outer tube by threads, and the nozzle assembly is installed at the right end of the upper joint; the upper outer tube is provided with an open hole flow channel for liquid discharge; the sand and dirt plug tube is installed inside the lower outer tube; the lower joint is connected to the lower outer tube by threads; the hand crank push rod is installed at the right end of the lower joint by threads, the left end of the hand crank push rod is in contact with the right end of the sand and dirt plug tube, and the hand crank push rod can push the sand and dirt plug tube by rotating the hand crank handle; the upper outer tube is connected to the lower outer tube by an oil pin;

[0006] The pressure gauge is installed on the upper outer cylinder by threads, and the pressure gauge is connected to the pressure control box, and the pressure control box can display the value of the pressure gauge; the device support frame is provided with an electric regulating valve, and the electric regulating valve is connected to the opening flow channel of the upper outer cylinder; the electric regulating valve and the pressure gauge are connected to the pressure control box through a control cable, and the pressure control box can control the pressure in the electric regulating valve control device after reaching the set pressure;

[0007] In the above solution, the slideway and the Y-type filter are mounted on the device support frame;

[0008] In the above scheme, the device support frame has a water outlet pipeline, the water outlet pipeline is connected to the open hole flow channel of the upper outer cylinder, and the Y-type filter is connected to the water outlet pipeline to complete the debris filtering;

[0009] In the above solution, the lower outer cylinder is connected to the slideway by a fastening clamp and can slide axially;

[0010] In the above scheme, the sand scale plugging tube can be filled with different contents to simulate the wax scale plugging situation in the well;

[0011] In the above scheme, the oil seal is connected to the upper outer tube and the lower outer tube, and then the sand and dirt plug tube is fixed to form a seal;

[0012] The present invention also provides a test method using the ground jet unblocking test device, comprising the following steps:

[0013] S1. Install the nozzle assembly to the right end of the upper joint, and then install the upper joint to the left end of the upper outer tube.

[0014] S2. The lower outer tube is connected to the slideway through a fastening clamp, and slides to the right away from the upper outer tube. The sand and scale plug tube with scale plugging is installed from the left end of the lower outer tube. The sand and scale plug tube is pushed with a hand-cranked push rod to adjust the distance between the left end plug surface and the nozzle assembly.

[0015] S3. After adjusting the position of the plug surface, push the lower outer cylinder and connect the upper outer cylinder and the lower outer cylinder with a grease sealant.

[0016] S4. Connect the upper joint to the pump with a high-pressure pipeline, connect the water outlet of the device support frame to the water outlet pipeline, turn on the pump to increase pressure, and the liquid will be ejected from the nozzle assembly to form a high-pressure jet to achieve cutting of the plug surface; after cutting, the debris will flow out from the open hole flow channel of the upper joint and be filtered by the Y-type filter; the internal pressure of the upper joint annulus is transmitted to the pressure control box through the pressure gauge. When the pressure exceeds the set value, the pressure control box controls the electric regulating valve to release the pressure to maintain stable pressure.

[0017] S5. After completing the jet unblocking test, stop the pump, wait until the pressure drops to 0 MPa, remove the oil seal, take out the sand-blocking pipe and observe the jet unblocking effect; remove the Y-type filter to collect debris, and replace the sand-blocking pipe to continue the test.

[0018] S6. After the test, remove the sand-blocked pipe, dismantle the high-pressure pipeline and the water outlet pipeline, maintain the ground jet unblocking test device and wait for the next use.

[0019] The ground jet unblocking test device and test method of the present invention have the following beneficial effects:

[0020] 1. The device test provided by the present invention is a continuous oil pipe with a nozzle assembly to the downhole plug surface, which can directly simulate the jet unblocking construction and effectively observe the jet unblocking operation;

[0021] 2. The device provided by the present invention can control the pressure to maintain the design value, and does not require human control while simulating the underground construction conditions, thereby realizing remote monitoring tests, ensuring the safety of on-site personnel, and effectively reducing the potential safety hazards caused by pressure rise;

[0022] 3. The device provided by the present invention can replace different sand plugging tubes. By replacing the content of the plugging tube, blockages in different situations can be tested, so that one device can simulate multiple results, further improving the test efficiency and saving more test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0024] Figure 1 is a front view of the ground jet unblocking test device of the present invention;

[0025] Figure 2 It is a left side view of the ground jet unblocking test device of the present invention;

[0026] Figure 3 It is a cross-sectional view of the plugging pipe of the ground jet plugging removal test device of the present invention after being pushed forward;

[0027] In the figure: 101-upper joint, 102-upper outer cylinder, 103-nozzle assembly, 104-sand plug tube, 105-lower outer cylinder, 106-lower joint, 107-hand crank push rod, 108-oil nozzle, 109-pressure gauge, 110-pressure control box, 111-device support frame, 112-electric regulating valve, 113-Y-type filter, 114-slide. DETAILED DESCRIPTION

[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the ground jet unblocking test device of the present invention includes an upper joint 101, an upper outer tube 102, a nozzle assembly 103, a sand and dirt plugging tube 104, a lower outer tube 105, a lower joint 106, a hand-cranked push rod 107, an oil nozzle 108, a pressure gauge 109, a pressure control box 110, a device support frame 111, an electric regulating valve 112, a Y-type filter 113, and a slide 114.

[0030] like Figure 1As shown, the left end of the upper joint 101 is connected to the high-pressure pipeline through a tapered thread, the right end of the upper joint 101 is threaded to install the nozzle assembly 103, and the upper joint 101 is connected to the upper outer tube 102 through a surface thread, and the internal and external pressures are isolated by an O-ring. The lower outer tube 105 is connected to the slideway through a fixing clamp, and after the fixing clamp clamps the upper outer tube 101, it can be axially displaced on the slideway 114 to adjust the position of the lower outer tube. The lower joint 106 is connected to the lower outer tube 105 through a thread, and the internal and external pressures are isolated by an O-ring. The hand crank push rod 107 is installed on the right end of the lower joint 106 through a thread, and the left end of the hand crank push rod 107 passes through the left end of the lower joint 106 to install a baffle to prevent the hand crank push rod 107 from exiting the lower joint 106, and the internal and external pressures are isolated by an O-ring. The baffle at the left end of the hand crank push rod 107 can be axially displaced in the lower outer tube 105. The scale plug tube 104 is directly installed in the annulus of the lower outer tube 105. The right end of the scale plug tube 104 contacts the baffle plate at the left end of the hand-cranked push rod 107. The hand-cranked push rod 107 can push the scale plug tube 104 to move axially to the left. The right end of the upper outer tube 102 is connected to the left end of the lower outer tube 105 through an oil seal 108. The function of the oil seal 108 is to close the annulus of the upper outer tube 102 and the lower outer tube 105, and fix the scale plug tube 104 to prevent it from moving during the test.

[0031] like Figure 1 , 2 As shown, the pressure gauge 109 is connected to the upper outer tube 102 by threads, and its function is to monitor the surrounding pressure in the device. The pressure gauge 109 is connected to the pressure control box 110 through a control cable, and the pressure control box can collect the pressure value displayed by the pressure gauge 109. The electric regulating valve 112 is connected to the opening flow channel of the upper outer tube 102, and the surrounding pressure in the upper outer tube 102 is controlled by adjusting the cross-sectional area of ​​the water outlet. The electric regulating valve 112 is connected to the pressure control box 110 through a control cable. When the pressure displayed by the pressure gauge 109 exceeds the set value, the pressure control box 110 controls the electric regulating valve 112 to adjust the cross-sectional area of ​​the water outlet to keep the pressure in the upper outer tube 102 at the set value. The Y-type filter 113 is installed on the device support frame 111, connected to the opening flow channel of the upper outer tube 102, and filters debris through the filter screen.

[0032] like Figure 3 As shown in the figure, after removing the oil pin 108, the hand crank push rod 107 can be displaced to the left by screwing in, and its left end baffle contacts the sand and scale plug tube 104, pushing the sand and scale plug tube 104 during the screwing in process. The main function is to adjust the distance between the nozzle assembly 103 and the plug surface at the left end of the sand and scale plug tube 104, and can simulate the effect of jet unblocking at different distances.

[0033] Correspondingly, the present invention also provides a test method for the above-mentioned ground jet unblocking test device, and the specific steps are as follows:

[0034] S1. Install the nozzle assembly 103 to the right end of the upper joint 101, and then install the upper joint 101 to the left end of the upper outer tube 102.

[0035] S2. The lower outer cylinder 105 is connected to the slide 114 by a fastening clamp, and slides to the right away from the upper outer cylinder. The sand and scale plug tube 104 with scale plugging is installed from the left end of the lower outer cylinder 105. The sand and scale plug tube 104 is pushed with a hand-cranked push rod 107 to adjust the distance between the left end plug surface and the nozzle assembly 103.

[0036] S3. After adjusting the position of the plug surface, push the lower outer cylinder 105 and connect the upper outer cylinder 102 and the lower outer cylinder 105 with the oil seal 108.

[0037] S4. Connect the upper joint 101 to the pump with a high-pressure pipeline, connect the water outlet of the device support frame 111 to the water outlet pipeline, turn on the pump to increase the pressure, and the liquid will be ejected from the nozzle assembly 103 to form a high-pressure jet to achieve cutting of the plug surface; after cutting, the debris will flow out from the open hole flow channel of the upper joint 101, and the debris will be filtered by the Y-type filter 113; the internal pressure of the annulus of the upper joint 101 is transmitted to the pressure control box 110 through the pressure gauge 109. When the pressure exceeds the set value, the pressure control box 110 controls the electric regulating valve 112 to release the pressure to maintain a stable pressure.

[0038] S5. After the jet unblocking test is completed, stop the pump, wait until the pressure drops to 0 MPa, remove the oil filter 108, take out the sand-blocking tube 104 and observe the jet unblocking effect; remove the Y-type filter 113 to collect debris, and replace the sand-blocking tube 104 to continue the test.

[0039] S6. After the test is finished, the sand-blocked pipe 104 is removed, the high-pressure pipeline and the water outlet pipeline are dismantled, and the ground jet unblocking test device is maintained and waits for the next use.

[0040] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A ground jet unblocking test device, characterized in that: It comprises an upper joint (101), an upper outer cylinder (102), a nozzle assembly (103), a sand and dirt plug pipe (104), a lower outer cylinder (105), a lower joint (106), a hand-cranked push rod (107), an oil nozzle (108), a pressure gauge (109), a pressure control box (110), a device support frame (111), an electric regulating valve (112), a Y-type filter (113) and a slideway (114); The nozzle assembly (103) is mounted on the upper joint (101); the upper joint (101) is mounted on the upper outer tube (102) by threaded connection; the hand crank push rod (107) is mounted in the lower joint (106); the lower joint (106) is mounted on the lower outer tube (105) by threaded connection; the sand and dirt plug tube (104) is in contact with the left end of the hand crank push rod (107), and the hand crank push rod (107) is used to push the sand and dirt plug tube (104); the sand and dirt plug tube (104) is mounted in the lower outer tube (105); the upper outer tube (102) and the lower outer tube (105) are connected by the oil pin (108); The pressure gauge (109) is installed on the upper outer tube (102) through threads, and the pressure gauge (109) is connected to the pressure control box (110), and the pressure control box (110) is used to display the value of the pressure gauge (109); the device support frame (111) is provided with an electric regulating valve (112), and the electric regulating valve (112) is connected to the opening flow channel of the upper outer tube (101); the electric regulating valve (112) and the pressure gauge (109) are connected to the pressure control box (110) through a control cable, and the pressure control box (110) is used to control the electric regulating valve (112) to control the pressure in the device after reaching a set pressure.

2. The ground jet unblocking test device according to claim 1 is characterized in that: The slideway (114) and the Y-type filter (113) are installed on the device support frame (111).

3. The ground jet unblocking test device according to claim 1, characterized in that: The device support frame (111) has a water outlet pipeline, which is connected to the open hole flow channel of the upper outer cylinder (102), and the Y-type filter (113) is connected to the water outlet pipeline to complete debris filtering.

4. The ground jet unblocking test device according to claim 1, characterized in that: The lower outer cylinder (105) is connected to the slideway (114) via a fastening clamp and is capable of axial sliding.

5. The ground jet unblocking test device according to claim 1, characterized in that: The sand and scale plugging tube (104) is used to fill different contents to simulate wax and scale plugging in the well.

6. The ground jet unblocking test device according to claim 1, characterized in that: The oil plug (108) is connected to the upper outer tube (102) and the lower outer tube (105) to fix the sand plug tube and form a seal.

7. A test method using the above-mentioned ground jet unblocking test device, characterized in that: The following steps are involved: S1. Install the nozzle assembly to the right end of the upper joint, and then install the upper joint to the left end of the upper outer tube; S2. The lower outer tube is connected to the slideway through a fastening clamp, and slides to the right away from the upper outer tube. The sand and scale plug tube with scale plugging is installed from the left end of the lower outer tube. The sand and scale plug tube is pushed with a hand-cranked push rod to adjust the distance between the left end plug surface and the nozzle assembly. S3. After adjusting the position of the plug surface, push the lower outer cylinder and connect the upper outer cylinder and the lower outer cylinder with oil. S4. Connect the upper joint to the pump with a high-pressure pipeline, connect the water outlet of the device support frame to the water outlet pipeline, turn on the pump to increase pressure, and the liquid will be ejected from the nozzle assembly to form a high-pressure jet to achieve cutting of the plug surface; after cutting, the debris will flow out from the opening flow channel of the upper joint and be filtered by the Y-type filter; the internal pressure of the upper joint annulus is transmitted to the pressure control box through the pressure gauge. When the pressure exceeds the set value, the pressure control box controls the electric regulating valve to release the pressure to maintain a stable pressure; S5. After the jet unblocking test is completed, stop the pump, wait until the pressure drops to 0 MPa, remove the oil seal, take out the sand-blocked pipe and observe the jet unblocking effect; remove the Y-type filter to collect debris, and replace the sand-blocked pipe to continue the test; S6. After the test, remove the sand-blocked pipe, dismantle the high-pressure pipeline and the water outlet pipeline, maintain the ground jet unblocking test device and wait for the next use.

Images