A packing tool detection device and method of use

Abstract

The present application relates to the technical field of oilfield downhole tools, and particularly relates to a filling tool detection device and a use method. The technical scheme is that a casing lower plug is installed at the lower end of a test casing, the lower end of the casing lower plug is connected to a reverse pressure test pump through a counter-pressure pipeline, a plurality of electric heating plates are installed on the outer wall of the test casing, a test oil pipe and a filling tool are lowered into the inner cavity of the test casing, the upper end of the test oil pipe passes through a wellhead flange and a sliding wellhead, and is connected with a pressure test tee, the upper end of the pressure test tee is connected with a tension and pressure loading device, the tension and pressure loading device is connected with a hydraulic pump station through a pipeline, the right end of the pressure test tee is connected with a forward pressure test pump through a pipeline, and the forward pressure test pump and the reverse pressure test pump are respectively connected with a heat-conducting oil tank through pipelines. The present application can integrally complete the lowering of the filling tool, setting, releasing, sealing detection after the closing of the filling port, and pressure release test detection, the device structure is compactly integrated, the working condition simulation is real, and the detection efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of downhole tools technology, and in particular to a filling tool detection device and its usage method. Background Technology

[0002] In oilfield development, packing tools are core downhole tools for operations such as fracturing, sand control, and acidizing. They primarily use high pressure to precisely deliver media such as gravel and fiber composite materials into the wellbore annulus, perforations, and near-wellbore formations, forming a high-permeability sand barrier. This simultaneously achieves multiple objectives, including sand control, unblocking, and increased production, making them crucial equipment for the development of loose sandstone and shale reservoirs. Therefore, their setting stability, packing port closure reliability, and bidirectional sealing performance directly determine the safety and success rate of oil and gas well operations. Consequently, it is necessary to test these properties of the packing tools before running them into the well.

[0003] However, existing filling tool testing has the following drawbacks: 1. The pressure test method is limited, and most of them can only achieve unidirectional annular pressure, and cannot independently pressurize the annulus in both directions; 2. The equipment integration is low. The filling tool installation, setting and pressurizing, and pressurized unsealing test need to be completed by disassembling multiple devices in steps, requiring multiple disassembly and relocation. The test procedures are cumbersome, the data repeatability is poor, and the efficiency is low. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a filling tool testing device and method. This invention can integrate the sealing test after the filling tool is inserted, set, released, and the filling port is closed, as well as the pressurized unsealing test. The device has a compact integrated structure and simulates real working conditions, greatly improving testing efficiency.

[0005] The present invention discloses a filling tool testing device, the technical solution of which includes a test casing and a test tubing, further comprising a casing plug, heating plates, a wellhead flange, a pressure testing tee, a tension / compression sensor, a tension / compression loading device, a measuring rod, a reverse pressure line, a sliding wellhead, a forward pressure testing pump, a reverse pressure testing pump, a heat transfer oil tank, and a hydraulic pump station. The test casing is installed inside the test well, and a casing plug is installed at the lower end of the test casing. The lower end of the casing plug is connected to the reverse pressure testing pump via the reverse pressure line. Multiple heating plates are installed on the outer wall of the test casing. A wellhead flange is installed at the upper end of the casing, and a sliding wellhead is installed at the upper end of the wellhead flange. A test tubing and filling tool are lowered into the inner cavity of the test casing. The upper end of the test tubing passes through the wellhead flange and the sliding wellhead and is connected to the lower end of a test pressure tee. The upper end of the test pressure tee is connected to a tension-compression loading device through a tension-compression sensor. The tension-compression loading device is connected to a hydraulic pump station through a pipeline. A measuring rod is installed on the upper part of the tension-compression loading device. The right end of the test pressure tee is connected to a forward test pump through a pipeline. The forward test pump and the reverse test pump are respectively connected to a heat transfer oil tank through pipelines.

[0006] Preferably, the sliding wellhead includes a sliding wellhead body, an upper pressure cap, a sealing ring, and a limiting ring. The sliding wellhead body has a central cavity in the middle, a limiting ring in the lower part of the central cavity, an upper pressure cap installed in the upper part of the central cavity, and multiple sets of sealing rings installed between the upper pressure cap and the limiting ring. The test tubing passes through the limiting ring and the sealing ring and extends upward along the inner cavity of the upper pressure cap.

[0007] Preferably, a circular steel ring groove is provided on the lower surface of the sliding wellhead body, and the diameter of the steel ring groove is larger than the outer diameter of the limiting ring. Multiple open sliding wellhead bolt holes are evenly distributed on the lower outer edge of the sliding wellhead body, and the sliding wellhead body is connected to the upper part of the wellhead flange by bolts.

[0008] Preferably, the wellhead flange includes a wellhead flange body, a reverse pressure test channel, wellhead bolt holes, lifting holes, and a central channel. The wellhead flange body has a central channel at its center and two lifting holes on its outer side. Wellhead bolt holes are evenly distributed on the outer edge of the wellhead flange body. An L-shaped reverse pressure test channel is provided inside the side wall of the wellhead flange body. The outer end of the reverse pressure test channel is connected to a reverse pressure test pump via a pipeline, and the inner end of the reverse pressure test channel is connected to a back pressure pipeline, which is connected to the casing lower plug via the back pressure pipeline.

[0009] Preferably, the lower plug of the casing is connected to the lower end of the test casing by a thread, and the lower plug of the casing has a central liquid passage at its center; the lower end of the lower plug of the casing is connected to the lower plug quick connector through the lower plug cap, the lower end of the lower plug quick connector is connected to the back pressure line, and a lower plug sealing gasket is installed between the back pressure line and the lower plug quick connector.

[0010] Preferably, the above-mentioned tension-compression loading device includes a tension-compression loading cylinder, an upper cylinder head, a piston, a guide sleeve, a tension-compression loading flange, a piston rod, and a buffer ring. The piston is installed in the inner cavity of the tension-compression loading cylinder, with a measuring rod connected to the upper end of the piston and a piston rod connected to the lower end. A buffer ring is installed in the upper part of the inner cavity of the tension-compression loading cylinder, and an upper cylinder head is installed above the buffer ring. A guide sleeve is installed in the lower part of the inner cavity of the tension-compression loading cylinder, and a tension-compression loading flange is installed at the lower end of the tension-compression loading cylinder. The measuring rod passes through the buffer ring and the upper cylinder head and extends to the outside of the tension-compression loading cylinder. The lower part of the piston rod passes through the guide sleeve and connects to the upper end of the test pressure tee. The tension-compression sensor is installed at the connection between the piston rod and the upper end of the test pressure tee.

[0011] Preferably, the upper side of the outer wall of the aforementioned tension-compression loading cylinder is provided with an upper pressure hole, and the lower side of the outer wall of the tension-compression loading cylinder is provided with a lower pressure hole. The piston moves in the area between the upper pressure hole and the lower pressure hole. The outer ends of the upper pressure hole and the lower pressure hole are respectively connected to a hydraulic pump station through pipelines.

[0012] Preferably, the filling tool includes a filling tool body, a sealing rubber sleeve, slips, a filling port, an upper filling tool connector, a lower filling tool connector, a setting ball seat, a central tube, a closing sleeve, and a closing spring. The upper filling tool connector is located at the upper end of the filling tool body, and the lower filling tool connector is located at the lower end. The sealing rubber sleeve and slips are installed in the lower middle part of the filling tool body. A filling port is located on the lower side of the filling tool body. The filling port is divided into an inner filling port and an outer filling port. A closing sleeve and a closing spring are installed between the inner filling port and the outer filling port. A setting ball seat is installed in the lower part of the inner cavity of the filling tool body through a shear pin to receive the inserted setting steel ball. A central tube is installed in the upper part of the inner cavity of the filling tool body.

[0013] The method of using the filling tool detection device mentioned in this invention includes the following steps: 1. After installing a blind plug at the lower end of the filling tool, it is sent into the designated position of the test casing in the test well through the test tubing connected at the upper end. Then, a setting steel ball is dropped into the test tubing at the wellhead on the surface. Next, a sliding wellhead, a pressure testing tee, and a tension-compression loading device are installed sequentially above the wellhead flange. Multiple support rods are installed between the wellhead flange and the tension-compression loading device. The tension-compression loading device is connected to a hydraulic pump station through a pipeline. The right end of the pressure testing tee is connected to a forward pressure testing pump through a pipeline. The forward and reverse pressure testing pumps are respectively connected to a heat transfer oil tank through pipelines. Then, the hydraulic pump station, tension-compression sensor, forward pressure testing pump, and reverse pressure testing pump are respectively connected to the main control system through signal lines. II. Sealing and Filling Tools: At the wellhead, by activating the forward pressure test pump, heat transfer oil enters the test tubing along the right end of the test tee. Since the setting steel ball is located at the setting ball seat, the pressure from the forward pressure test pump causes the sealing sleeve of the filling tool to expand, thereby achieving the setting operation of the filling tool and dividing the inner cavity of the test casing into an upper annulus and a lower annulus. Then, the hydraulic pump station is activated, and the tension and compression loading device is operated to lift and lower, thereby testing the setting firmness of the filling tool. Then, the forward pressure test pump continues to pressurize, the shear pin of the setting ball seat is broken, and the setting ball seat and setting steel ball are knocked off to expose the filling port, and various pressure data are recorded. 3. Losing the filling tool: By rotating the test tubing in the forward direction, the filling tool is released. After release, the test tubing is lifted, causing the central tube to move upward. The central tube then moves the closing sleeve to close the filling port. Simultaneously, the closing spring generates an upward thrust to keep the closing sleeve continuously closed. A sealing gasket is installed on the closing sleeve. The lifting distance is recorded by a measuring rod to ensure that the filling port is completely closed. The upper pressure cap of the sliding wellhead is rotated and tightened to create a sealed cavity between the sliding wellhead and the test tubing. IV. After release, the sealing test after the filling port is closed includes forward pressure test, reverse pressure test, and bidirectional pressure test: i. Test the sealing performance of the upper part of the filling tool by gradually increasing, stabilizing and depressurizing the upper annulus by only starting the positive pressure test pump; ii. Test the sealing performance of the lower part of the filling tool by gradually increasing, stabilizing and depressurizing the lower annulus by starting only the reverse pressure test pump; iii. By synchronously increasing the pressure of the forward pressure test pump and the reverse pressure test pump according to the set pressure value, a positive pressure difference, a reverse pressure difference or an equal pressure condition is formed on the upper and lower sides of the sealing sleeve, which completely simulates the real sealing stress environment of the formation with the coexistence of pressure differences above and below. V. Pressurized Unsealing Test of Filling Tool: First, a constant pressure is maintained in the lower annulus of the sealing sleeve using a reverse pressure testing pump to simulate a pressurized downhole environment. Then, the hydraulic pump station is started, and the piston of the tension-compression loading device drives the piston rod to output axial unsealing force. The magnitude of the force, the lifting speed, and the displacement stroke are all controlled and collected by the central control system. The central control system compares the annulus pressure value with the unsealing axial force value in real time, recording the annulus pressure threshold and the minimum unsealing lifting load corresponding to the moment the sealing sleeve contracts and unseales. The unsealing stress state of the filling tool under residual pressure in the wellbore during field operations is simulated, testing the unsealing reliability and unsealing resistance of the filling tool under pressurized conditions.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention involves inserting a test tubing and filling tool into a test casing. The upper end of the test tubing passes through the wellhead flange and sliding wellhead, and is connected to a test pressure tee. The upper end is connected to a tension-compression loading device via a tension-compression sensor. The tension-compression loading device is connected to a hydraulic pump station via a pipeline. A measuring rod is installed on the upper part of the tension-compression loading device. The right end of the test pressure tee is connected to a forward test pump via a pipeline. The forward test pump and the reverse test pump are respectively connected to a heat transfer oil tank via pipelines. The entire testing device has a compact structure and does not require disassembly and transportation. This invention uses a positive pressure test pump to pressurize and expand the sealing sleeve of the filling tool, thereby achieving the setting and sealing operation of the filling tool. It also divides the inner cavity of the test sleeve into an upper annulus and a lower annulus. Then, the hydraulic pump station is turned on, and the tension and compression loading device is operated to lift and lower, thereby testing the setting and sealing firmness of the filling tool. This invention uses a forward pressure testing pump to pressurize the filling port, exposing the setting ball and setting steel ball, and records various pressure data. It can also perform seal testing after the filling tool is released and the filling port is closed, including forward pressure testing, reverse pressure testing, and bidirectional pressure testing. The bidirectional pressure testing involves synchronously increasing the pressure of the forward and reverse pressure testing pumps according to set pressure values, creating a forward pressure difference, reverse pressure difference, or equal pressure condition on the upper and lower sides of the sealing sleeve, completely simulating the real sealing stress environment of the wellbore where pressure differences exist between the upper and lower formations. Furthermore, it can perform pressurized unsealing tests on the filling tool, simulating the unsealing stress state of the filling tool under residual pressure in the wellbore during field operations, testing the reliability and unsealing resistance of the filling tool under pressurized conditions, thus improving testing efficiency. Attached Figure Description

[0015] Figure 1 This is a connection diagram of the present invention applied to a test well; Figure 2 This is a structural diagram of the filling tool; Figure 3 This is a cross-sectional view of the filling tool; Figure 4 This is a magnified internal view of the filling tool; Figure 5 This is a partially enlarged schematic diagram of the filling tool's shape; Figure 6 This is a schematic diagram showing the filling tool being installed before the test sleeve; Figure 7 This is a schematic diagram of the external shape of the filling tool after it has been inserted into the test sleeve; Figure 8 This is a cross-sectional view of the filling tool after it has been inserted into the test sleeve; Figure 9 This is a schematic diagram of the structure after the setting steel ball is inserted and the sliding wellhead, pressure testing tee and tension-compression loading device are installed; Figure 10 This is a schematic diagram of the structure after the filling tool is released, where the tension and compression loading device drives the test oil pipe to move upward. Figure 11 This is a schematic diagram of the external shape of the tension / compression loading device; Figure 12 This is a schematic diagram of the tension / compression loading device; Figure 13 This is a schematic diagram of the sliding wellhead. Figure 14 This is a schematic diagram of the sliding wellhead structure; Figure 15 This is a partially enlarged schematic diagram of the sliding wellhead flange installation; Figure 16 This is a structural diagram of the wellhead flange; Figure 17 This is a partially enlarged schematic diagram of the installation location of the lower plug on the sleeve; In the diagram: 1. Test well; 2. Casing plug; 3. Test casing; 4. Heating plate; 5. Filling tool; 6. Wellhead flange; 7. Test tubing; 8. Test tee; 9. Support rod; 10. Tension-compression sensor; 11. Tension-compression loading device; 12. Measuring rod; 13. Main control system; 14. Back pressure pipeline; 15. Sliding wellhead; 16. Forward test pump; 17. Reverse test pump; 18. Heat transfer oil tank; 19. Hydraulic pump station; 20. Blind plug. 2.1 Central fluid passage, 2.2 Lower plug cap, 2.3 Lower plug quick connector, 2.4 Lower plug sealing gasket, 5.1 Filling tool body, 5.2 Sealing sleeve, 5.3 Slips, 5.4 Filling port, 5.5 Upper connector of filling tool, 5.6 Lower connector of filling tool, 5.7 Setting ball seat, 5.8 Setting steel ball, 5.9 Central tube, 5.10 Closing sleeve, 5.11 Closing spring, 6.1 Wellhead flange body, 6.2 Reverse pressure test passage, 6.3 Wellhead bolt hole, 6.4 Lifting hole, 6.5 Central passage; 11.1 Tension-compression loading cylinder body, 11.2 Upper cylinder head, 11.3 Piston, 11.4 Guide sleeve, 11.5 Tension-compression loading flange, 11.6 Piston rod, 11.7 Upper pressure hole, 11.8 Lower pressure hole, 11.9 Buffer ring; 15.1 Sliding wellhead body, 15.2 Upper pressure cap, 15.3 Sealing ring, 15.4 Steel ring groove, 15.5 Sliding wellhead bolt hole, 15.6 Limiting ring, 16.1 First pressure gauge, 16.2 First flow meter, 17.1 Second pressure gauge, 17.2 Second flow meter. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] Example 1, referring to Figures 1-17The present invention discloses a filling tool testing device, comprising a test casing 3 and a test tubing 7, and further comprising a casing plug 2, a heating plate 4, a wellhead flange 6, a pressure testing tee 8, a tension / compression sensor 10, a tension / compression loading device 11, a measuring rod 12, a back pressure line 14, a sliding wellhead 15, a forward pressure testing pump 16, a reverse pressure testing pump 17, a heat transfer oil tank 18, and a hydraulic pump station 19. The test casing 3 is installed inside a test well 1. A casing plug 2 is installed at the lower end of the test casing 3, and the lower end of the casing plug 2 is connected to the reverse pressure testing pump 17 via the back pressure line 14. Multiple heating plates 4 are installed on the outer wall of the test casing 3. A wellhead flange 6 is installed at the upper end of the test casing 3, and a sliding wellhead 15 is installed at the upper end of the wellhead flange 6. The test tubing 7 and the filling tool 5 are inserted into the inner cavity of the test casing 3. The end of the test tee passes through the wellhead flange 6 and the sliding wellhead 15, and is connected to the lower end of the test tee 8. The upper end of the test tee 8 is connected to the tension-compression loading device 11 through the tension-compression sensor 10. The tension-compression loading device 11 is connected to the hydraulic pump station 19 through a pipeline. A measuring rod 12 is installed on the upper part of the tension-compression loading device 11. The right end of the test tee 8 is connected to the forward test pump 16 through a pipeline. The forward test pump 16 is connected to the heat transfer oil tank 18 through a pipeline and the first flow meter 16.2. The reverse test pump 17 is connected to the heat transfer oil tank 18 through a pipeline and the second flow meter 17.2. The hydraulic pump station 19, the tension-compression sensor 10, the first pressure gauge 16.1 and the first flow meter 16.2 on the forward test pump 16, and the second pressure gauge 17.1 and the second flow meter 17.2 on the reverse test pump 17 are respectively connected to the main control system 13 through signal lines.

[0018] Reference Figures 13-15 The sliding wellhead 15 mentioned in this invention includes a sliding wellhead body 15.1, an upper pressure cap 15.2, a sealing ring 15.3, and a limiting ring 15.6. The sliding wellhead body 15.1 has a central cavity in its middle, with a limiting ring 15.6 at the lower part of the central cavity. The upper pressure cap 15.2 is installed at the upper part of the central cavity. Multiple sets of sealing rings 15.3 are installed between the upper pressure cap 15.2 and the limiting ring 15.6. The test tubing 7 passes through the limiting ring 15.6 and the sealing rings 15.3, extending upwards along the inner cavity of the upper pressure cap 15.2. When the upper pressure cap 15.2 of the sliding wellhead 15 is loosened, the test tubing 7 can move up and down and rotate circumferentially. When the upper pressure cap 15.2 of the sliding wellhead 15 is tightened, a sealed cavity is constructed between the sliding wellhead 15 and the test tubing 7, achieving sealing under high-pressure conditions.

[0019] The sliding wellhead body 15.1 has a circular steel ring groove 15.4 on its lower surface, and the diameter of the steel ring groove 15.4 is larger than the outer diameter of the limiting ring 15.6. Multiple open sliding wellhead bolt holes 15.5 are evenly distributed on the lower outer edge of the sliding wellhead body 15.1, and the sliding wellhead body 15.1 is connected to the upper part of the wellhead flange 6 by bolts.

[0020] Reference Figure 16 The wellhead flange 6 mentioned in this invention includes a wellhead flange body 6.1, a reverse pressure test channel 6.2, wellhead bolt holes 6.3, lifting holes 6.4, and a central channel 6.5. The wellhead flange body 6.1 has a central channel 6.5 at its center and two lifting holes 6.4 on its outer side. Wellhead bolt holes 6.3 are evenly distributed on the outer edge of the wellhead flange body 6.1. An L-shaped reverse pressure test channel 6.2 is provided inside the side wall of the wellhead flange body 6.1. The outer end of the reverse pressure test channel 6.2 is connected to a reverse pressure test pump 17 through a pipeline, and the inner end of the reverse pressure test channel 6.2 is connected to a back pressure pipeline 14, which is connected to the casing lower plug 2 through the back pressure pipeline 14.

[0021] Reference Figure 17 The casing lower plug 2 mentioned in this invention is connected to the lower end of the test casing 3 by a thread. The casing lower plug 2 has a central liquid passage 2.1 in the center. The lower end of the casing lower plug 2 is connected to the lower plug quick connector 2.3 through the lower plug cap 2.2. The lower end of the lower plug quick connector 2.3 is connected to the back pressure line 14, and a lower plug sealing gasket 2.4 is installed between the back pressure line 14 and the lower plug quick connector 2.3.

[0022] Reference Figures 11-12 The tension / compression loading device 11 mentioned in this invention includes a tension / compression loading cylinder body 11.1, an upper cylinder cover 11.2, a piston 11.3, a guide sleeve 11.4, a tension / compression loading flange 11.5, a piston rod 11.6, and a buffer ring 11.9. The piston 11.3 is installed inside the inner cavity of the tension / compression loading cylinder body 11.1. The upper end of the piston 11.3 is connected to a measuring rod 12, and the lower end is connected to the piston rod 11.6. A buffer ring 11.9 is installed on the upper part of the inner cavity of the tension / compression loading cylinder body 11.1. The upper cylinder head 11.2 is installed on top, and the guide sleeve 11.4 is installed in the lower part of the inner cavity of the tension and compression loading cylinder 11.1. The tension and compression loading flange 11.5 is installed at the lower end of the tension and compression loading cylinder 11.1. The measuring rod 12 passes through the buffer ring 11.9 and the upper cylinder head 11.2 and extends to the outside of the tension and compression loading cylinder 11.1. The lower part of the piston rod 11.6 passes through the guide sleeve 11.4 and is connected to the upper end of the test pressure tee 8. The tension and compression sensor 10 is installed at the connection between the piston rod 11.6 and the upper end of the test pressure tee 8.

[0023] The upper side of the outer wall of the aforementioned tension-compression loading cylinder 11.1 is provided with an upper pressure hole 11.7, and the lower side of the outer wall of the tension-compression loading cylinder 11.1 is provided with a lower pressure hole 11.8. The piston 11.3 moves in the area between the upper pressure hole 11.7 and the lower pressure hole 11.8. The outer ends of the upper pressure hole 11.7 and the lower pressure hole 11.8 are respectively connected to the hydraulic pump station 19 through pipelines.

[0024] Reference Figures 2-8 The filling tool 5 mentioned in this invention includes a filling tool body 5.1, a sealing rubber sleeve 5.2, a slip 5.3, a filling port 5.4, an upper filling tool connector 5.5, a lower filling tool connector 5.6, a setting ball seat 5.7, a central tube 5.9, a closing sleeve 5.10, and a closing spring 5.11. The upper filling tool connector 5.5 is provided at the upper end of the filling tool body 5.1, and the lower filling tool connector 5.6 is provided at the lower middle part of the filling tool body 5.1. The filling tool body 5.1 is equipped with a sealing sleeve 5.2 and a slip 5.3. A filling port 5.4 is provided on the lower side of the filling tool body 5.1. The filling port 5.4 is divided into an inner filling port and an outer filling port. A closing sleeve 5.10 and a closing spring 5.11 are installed between the inner filling port and the outer filling port. A setting ball seat 5.7 is installed in the lower part of the inner cavity of the filling tool body 5.1 by means of a shear pin to receive the inserted setting steel ball 5.8. A central tube 5.9 is installed in the upper part of the inner cavity of the filling tool body 5.1.

[0025] The method of using the filling tool detection device mentioned in this invention includes the following steps: 1. After installing the blind plug 20 at the lower end of the filling tool 5, it is sent into the designated position of the test casing 3 in the test well 1 through the test tubing 7 connected at the upper end. Then, at the wellhead on the ground, the setting steel ball 5.8 is dropped along the test tubing 7. Then, the sliding wellhead 15, the pressure test tee 8 and the tension-compression loading device 11 are installed in sequence above the wellhead flange 6. Multiple support rods 9 are installed between the wellhead flange 6 and the tension-compression loading device 11. The tension-compression loading device 11 is connected to the hydraulic pump station 19 through a pipeline. The right end of the pressure test tee 8 is connected to the forward pressure test pump 16 through a pipeline. The forward pressure test pump 16 and the reverse pressure test pump 17 are respectively connected to the heat transfer oil tank 18 through pipelines. Then, the hydraulic pump station 19, the tension-compression sensor 10, the forward pressure test pump 16 and the reverse pressure test pump 17 are respectively connected to the main control system 13 through signal lines. II. Sealing and Filling Tool 5: At the wellhead, by activating the forward pressure test pump 16, heat transfer oil enters the test tubing 7 along the right end of the test tee 8. Since the setting steel ball 5.8 is located at the setting ball seat 5.7, the pressure from the forward pressure test pump 16 causes the sealing sleeve 5.2 of the filling tool 5 to expand, thereby achieving the setting operation of the filling tool and dividing the inner cavity of the test casing 3 into an upper annulus and a lower annulus. Then, the hydraulic pump station 19 is activated, and the tension and compression loading device 11 is operated to lift and lower, thereby testing the setting firmness of the filling tool 5. Then, the forward pressure test pump 16 continues to pressurize, and the shear pin of the setting ball seat 5.7 is broken, knocking off the setting ball seat 5.7 and the setting steel ball 5.8 to expose the filling port 5.4, and recording various pressure data. 3. Losing the filling tool: By rotating the test tubing 7, the filling tool 5 is released. After release, the test tubing 7 is lifted, causing the central tube 5.9 to move upward. The central tube 5.9 then moves the closing sleeve 5.10 to close the filling port 5.4. Simultaneously, the closing spring 5.11 generates an upward thrust to keep the closing sleeve 5.10 continuously closed. A sealing gasket is installed on the closing sleeve 5.10. The lifting distance is recorded by the measuring rod 12 to ensure that the filling port 5.4 is completely closed. The upper pressure cap 15.2 of the sliding wellhead 15 is rotated and tightened to form a sealed cavity between the sliding wellhead 15 and the test tubing 7. IV. After release, the sealing test after the filling port is closed includes forward pressure test, reverse pressure test, and bidirectional pressure test: i. Test the sealing performance of the upper part of the filling tool 5 by gradually increasing, stabilizing and depressurizing the upper annulus by only starting the positive pressure test pump 16; ii. By only starting the reverse pressure test pump 17, gradually increase, stabilize, and release the pressure in the lower annulus to test the sealing performance of the filling tool 5; iii. By synchronously increasing the pressure of the forward pressure test pump 16 and the reverse pressure test pump 17 according to the set pressure value, a positive pressure difference, a reverse pressure difference or an equal pressure condition is formed on the upper and lower sides of the sealing sleeve 5.2, which completely simulates the real sealing stress environment of the well where the pressure difference between the upper and lower parts of the formation coexists. V. Filling Tool 5: Pressure Unsealing Test First, a constant pressure is maintained on the lower annulus of the sealing sleeve 5.2 using the reverse pressure test pump 17 to simulate a pressurized downhole environment. The hydraulic pump station 19 is started, and the piston 11.3 of the tension-compression loading device 11 drives the piston rod 11.6 to output an axial unsealing force. The magnitude of the force, the lifting speed, and the displacement stroke are all controlled and collected by the central control system 13. The central control system 13 compares the annulus pressure value with the unsealing axial force value in real time and records the annulus pressure threshold and the minimum unsealing lifting load corresponding to the moment the sealing sleeve 5.2 contracts and unseales. The unsealing force state of the filling tool 5 is simulated under the condition of residual pressure in the wellbore during field operations, and the unsealing reliability and unsealing resistance of the filling tool 5 under pressurized conditions are tested.

[0026] Example 2: A filling tool testing device mentioned in this invention includes a test casing 3 and a test tubing 7. It also includes a casing plug 2, heating plates 4, a wellhead flange 6, a pressure testing tee 8, a tension / compression sensor 10, a tension / compression loading device 11, a measuring rod 12, a back pressure line 14, a sliding wellhead 15, a forward pressure testing pump 16, a reverse pressure testing pump 17, a heat transfer oil tank 18, and a hydraulic pump station 19. The test casing 3 is installed inside a test well 1. A casing plug 2 is installed at the lower end of the test casing 3, and the lower end of the casing plug 2 is connected to the reverse pressure testing pump 17 via the back pressure line 14. Multiple heating plates 4 are installed on the outer wall of the test casing 3. A wellhead flange 6 is installed at the upper end of the test casing 3, and a sliding wellhead 15 is installed at the upper end of the wellhead flange 6. The test tubing 7 and the filling tool 5 are inserted into the inner cavity of the test casing 3. The upper end of the test tee passes through the wellhead flange 6 and the sliding wellhead 15, and is connected to the lower end of the test tee 8. The upper end of the test tee 8 is connected to the tension-compression loading device 11 through the tension-compression sensor 10. The tension-compression loading device 11 is connected to the hydraulic pump station 19 through a pipeline. The upper part of the tension-compression loading device 11 is equipped with a measuring rod 12. The right end of the test tee 8 is connected to the forward test pump 16 through a pipeline. The forward test pump 16 is connected to the heat transfer oil tank 18 through a pipeline and the first flow meter 16.2. The reverse test pump 17 is connected to the heat transfer oil tank 18 through a pipeline and the second flow meter 17.2. The hydraulic pump station 19, the tension-compression sensor 10, the first pressure gauge 16.1 and the first flow meter 16.2 on the forward test pump 16, and the second pressure gauge 17.1 and the second flow meter 17.2 on the reverse test pump 17 are respectively connected to the main control system 13 through signal lines.

[0027] The difference from Example 1 is: In this embodiment, multiple heating plates 4 are evenly distributed on the outer wall of the test sleeve 3, and temperature sensors are installed on each of them. They are connected to the main control system 13 through signal lines to realize temperature control simulation.

[0028] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A filling tool testing device, comprising a test sleeve (3) and a test tubing (7), characterized in that: It also includes a casing plug (2), a heating plate (4), a wellhead flange (6), a test pressure tee (8), a tension / compression sensor (10), a tension / compression loading device (11), a measuring rod (12), a back pressure line (14), a sliding wellhead (15), a forward test pressure pump (16), a reverse test pressure pump (17), a heat transfer oil tank (18), and a hydraulic pump station (19). The test casing (3) is installed inside the test well (1). A casing plug (2) is installed at the lower end of the test casing (3). The lower end of the casing plug (2) is connected to the reverse test pressure pump (17) through the back pressure line (14). Multiple heating plates (4) are installed on the outer wall of the test casing (3). A wellhead flange (6) is installed at the upper end of the test casing (3). A sliding wellhead (15) is installed at the upper end of the flange (6); a test tubing (7) and a filling tool (5) are lowered into the inner cavity of the test casing (3). The upper end of the test tubing (7) passes through the wellhead flange (6) and the sliding wellhead (15) and is connected to the lower end of the test pressure tee (8). The upper end of the test pressure tee (8) is connected to the tension and pressure loading device (11) through the tension and pressure sensor (10). The tension and pressure loading device (11) is connected to the hydraulic pump station (19) through the pipeline. A measuring rod (12) is installed on the upper part of the tension and pressure loading device (11). The right end of the test pressure tee (8) is connected to the forward test pump (16) through the pipeline. The forward test pump (16) and the reverse test pump (17) are respectively connected to the heat transfer oil tank (18) through the pipeline.

2. The filling tool detection device according to claim 1, characterized in that: The sliding wellhead (15) includes a sliding wellhead body (15.1), an upper pressure cap (15.2), a sealing ring (15.3), and a limiting ring (15.6). The sliding wellhead body (15.1) has a central cavity in the middle, and a limiting ring (15.6) is provided at the lower part of the central cavity. The upper pressure cap (15.2) is installed at the upper part of the central cavity. Multiple sets of sealing rings (15.3) are installed between the upper pressure cap (15.2) and the limiting ring (15.6). The test tubing (7) passes through the limiting ring (15.6) and the sealing ring (15.3) and extends upward along the inner cavity of the upper pressure cap (15.2).

3. The filling tool detection device according to claim 2, characterized in that: in The lower surface of the sliding wellhead body (15.1) is provided with a circular steel ring groove (15.4), and the diameter of the steel ring groove (15.4) is larger than the outer diameter of the limiting ring (15.6). Multiple open sliding wellhead bolt holes (15.5) are evenly distributed on the lower outer edge of the sliding wellhead body (15.1). The sliding wellhead body (15.1) is connected to the upper part of the wellhead flange (6) by bolts.

4. The filling tool detection device according to claim 3, characterized in that: The wellhead flange (6) includes a wellhead flange body (6.1), a reverse pressure test channel (6.2), wellhead bolt holes (6.3), lifting holes (6.4), and a central channel (6.5). The wellhead flange body (6.1) has a central channel (6.5) at its center and two lifting holes (6.4) on its outer side. Wellhead bolt holes (6.3) are evenly distributed on the outer edge of the wellhead flange body (6.1). An L-shaped reverse pressure test channel (6.2) is provided inside the side wall of the wellhead flange body (6.1). The outer end of the reverse pressure test channel (6.2) is connected to the reverse pressure test pump (17) through a pipeline. The inner end of the reverse pressure test channel (6.2) is connected to the back pressure pipeline (14), which is connected to the casing lower plug (2) through the back pressure pipeline (14).

5. The filling tool detection device according to claim 4, characterized in that: The lower plug (2) of the casing is connected to the lower end of the test casing (3) by a thread. The lower plug (2) of the casing has a central liquid passage (2.1). The lower end of the lower plug (2) of the casing is connected to the lower plug quick connector (2.3) through the lower plug cap (2.2). The lower end of the lower plug quick connector (2.3) is connected to the back pressure line (14), and a lower plug sealing gasket (2.4) is installed between the back pressure line (14) and the lower plug quick connector (2.3).

6. The filling tool detection device according to claim 5, characterized in that: The tension-compression loading device (11) includes a tension-compression loading cylinder body (11.1), an upper cylinder cover (11.2), a piston (11.3), a guide sleeve (11.4), a tension-compression loading flange (11.5), a piston rod (11.6), and a buffer ring (11.9). The piston (11.3) is installed in the inner cavity of the tension-compression loading cylinder body (11.1). The upper end of the piston (11.3) is connected to a measuring rod (12), and the lower end is connected to the piston rod (11.6). A buffer ring (11.9) is installed on the upper part of the inner cavity of the tension-compression loading cylinder body (11.1). The upper part of the buffer ring (11.9) is connected to a measuring rod (12), and the lower end is connected to the piston rod (11.6). Install the upper cylinder head (11.2), install the guide sleeve (11.4) in the lower part of the inner cavity of the tension-compression loading cylinder (11.1), install the tension-compression loading flange (11.5) at the lower end of the tension-compression loading cylinder (11.1), extend the measuring rod (12) through the buffer ring (11.9) and the upper cylinder head (11.2) to the outside of the tension-compression loading cylinder (11.1), and connect the lower part of the piston rod (11.6) through the guide sleeve (11.4) to the upper end of the test pressure tee (8), and install the tension-compression sensor (10) at the connection between the piston rod (11.6) and the upper end of the test pressure tee (8).

7. The filling tool detection device according to claim 6, characterized in that: The upper side of the outer wall of the tension-compression loading cylinder (11.1) is provided with an upper pressure hole (11.7), and the lower side of the outer wall of the tension-compression loading cylinder (11.1) is provided with a lower pressure hole (11.8). The piston (11.3) moves in the area between the upper pressure hole (11.7) and the lower pressure hole (11.8). The outer ends of the upper pressure hole (11.7) and the lower pressure hole (11.8) are respectively connected to the hydraulic pump station (19) through pipelines.

8. The filling tool detection device according to claim 7, characterized in that: The filling tool (5) includes a filling tool body (5.1), a sealing rubber sleeve (5.2), a slip (5.3), a filling port (5.4), an upper connector (5.5), a lower connector (5.6), a setting ball seat (5.7), a central tube (5.9), a closing sleeve (5.10), and a closing spring (5.11). The upper end of the filling tool body (5.1) is provided with the upper connector (5.5), and the lower end is provided with the lower connector (5.6). The middle and lower part of the filling tool body (5.1) is equipped with... The filling tool body (5.1) is equipped with a sealing rubber tube (5.2) and a slip (5.3). A filling port (5.4) is provided on the lower side of the filling tool body (5.1). The filling port (5.4) is divided into an inner filling port and an outer filling port. A closing sleeve (5.10) and a closing spring (5.11) are installed between the inner filling port and the outer filling port. A setting ball seat (5.7) is installed in the lower part of the inner cavity of the filling tool body (5.1) by means of a shearing pin to receive the inserted setting steel ball (5.8). A central tube (5.9) is installed in the upper part of the inner cavity of the filling tool body (5.1).

9. The method of using the filling tool detection device according to claim 8, characterized in that: Includes the following processes:

1. After installing the blind plug (20) at the lower end of the filling tool (5), send it into the test casing (3) in the test well (1) through the test tubing (7) connected at the upper end. Then, at the wellhead on the ground, drop the setting steel ball (5.8) along the test tubing (7). Then, install the sliding wellhead (15), the pressure test tee (8), and the tension-pressure loading device (11) in sequence above the wellhead flange (6). Install multiple [unclear] between the wellhead flange (6) and the tension-pressure loading device (11). A support rod (9) is provided, and the tension and compression loading device (11) is connected to the hydraulic pump station (19) through a pipeline. The right end of the test pressure tee (8) is connected to the forward test pressure pump (16) through a pipeline. The forward test pressure pump (16) and the reverse test pressure pump (17) are respectively connected to the heat transfer oil tank (18) through pipelines. The hydraulic pump station (19), tension and compression sensor (10), forward test pressure pump (16), and reverse test pressure pump (17) are then connected to the main control system (13) through signal lines. II. Sealing and Filling Tools (5): At the wellhead, by turning on the forward pressure test pump (16), the heat transfer oil enters the test tubing (7) along the right end of the test pressure tee (8). Since the setting steel ball (5.8) is located at the setting ball seat (5.7), the sealing rubber sleeve (5.2) of the filling tool (5) expands after being pressurized by the forward pressure test pump (16), thereby realizing the setting operation of the filling tool and dividing the inner cavity of the test casing (3) into the upper annulus and the lower annulus. Then, the hydraulic pump station (19) is turned on, and the tension and pressure loading device (11) is operated to lift and lower, thereby testing the setting firmness of the filling tool (5). Then, the forward pressure test pump (16) is pressed again, and the shear pin of the setting ball seat (5.7) is broken, and the setting ball seat (5.7) and the setting steel ball (5.8) are knocked off to expose the filling port (5.4). Various pressure data are recorded.

3. Losing the filling tool: By rotating the test tubing (7) in the forward direction, the filling tool (5) is released. After being released, the test tubing (7) is lifted, which drives the central tube (5.9) to move upward. The central tube (5.9) drives the closing sleeve (5.10) to move, thereby closing the filling port (5.4). At the same time, the closing spring (5.11) generates an upward thrust to keep the closing sleeve (5.10) in a continuously closed state. A sealing gasket is installed on the closing sleeve (5.10). The distance of lifting is recorded by the measuring rod (12) to ensure that the filling port (5.4) is completely closed. The upper pressure cap (15.2) of the sliding wellhead (15) is rotated and tightened to construct a sealed cavity between the sliding wellhead (15) and the test tubing (7). IV. After release, the sealing test after the filling port is closed includes forward pressure test, reverse pressure test, and bidirectional pressure test: i. By starting only the positive pressure test pump (16) to gradually increase, stabilize and release the pressure of the upper annulus, the sealing performance of the upper part of the filling tool (5) is tested; ii. By only starting the reverse pressure test pump (17) to gradually increase, stabilize and release the pressure of the lower annulus, the sealing performance of the filling tool (5) is tested; iii. By using the forward pressure test pump (16) and the reverse pressure test pump (17) to synchronously increase the pressure according to the set pressure value, the upper and lower sides of the sealing sleeve (5.2) are formed with a positive pressure difference, a reverse pressure difference or an equal pressure condition, which completely simulates the real sealing stress environment of the formation with the coexistence of pressure differences above and below. V. Filling tools (5) Pressurized unsealing test: First, a constant pressure is maintained on the lower annulus of the sealing sleeve (5.2) by a reverse pressure test pump (17) to simulate the downhole pressurized environment; the hydraulic pump station (19) is started, and the piston (11.3) of the tension-compression loading device (11) drives the piston rod (11.6) to output the axial unsealing pull force. The magnitude of the pull force, the lifting speed, and the displacement stroke are controlled and collected by the central control system (13). The central control system (13) compares the annulus pressure value with the unsealing axial pull force value in real time and records the annulus pressure threshold and the minimum unsealing lifting load corresponding to the moment when the sealing sleeve (5.2) contracts and unseales; the unsealing force state of the filling tool (5) under the condition of residual pressure in the wellbore during on-site operation is simulated, and the unsealing reliability and unsealing resistance of the filling tool (5) under pressurized conditions are tested.

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