Testing device, testing method and application for bridge plug setting tool's post-release shifting distance

Abstract

The present application relates to the technical field of perforating completion, in particular to a testing device, testing method and application of a bridge plug setting tool lost circulation distance, the testing device comprising a platform, a pressure-bearing casing and a simulation tool string; the platform is provided with a strong magnetic block, a support frame, a driving part and a measuring device; the pressure-bearing casing comprises a casing, a plurality of communication holes are arranged on the pressure-bearing plugs at both ends of the pressure-bearing casing, and are respectively used for connecting a manual pressure relief valve, a spring safety valve, a communication plug or a hydraulic control system; the simulation tool string comprises a shear pin, a shear rod, a push cylinder, a bridge plug setting tool, an ignition nipple, a high-pressure-resistant ignition wire and a strong magnetic counterweight column. Through the testing device, testing method and application thereof, the bridge plug setting tool lost circulation distance can be accurately measured, operation is carried out combined with the actually measured displacement distance, and safe operation of the downhole cable is ensured.

Description

Technical Field

[0001] This invention relates to the field of perforation completion technology, and in particular to a testing device, testing method, and application for measuring the distance of movement after the bridge plug setting tool is released. Background Technology

[0002] Horizontal well volumetric fracturing technology is a key technology for the development of unconventional oil and gas resources with low porosity and low permeability, such as shale gas and tight oil and gas. Bridge plug perforation combined operation (hereinafter referred to as bridge-perforation combined operation) is a crucial component of this technology. Bridge-perforation combined operation refers to the process of using a cable-driven method to deliver a perforating gun and a bridge plug setting tool string (hereinafter referred to as the tool string) to the target formation in the horizontal well, under the premise of effective communication between the wellbore and the formation, and then completing the bridge plug setting and perforation operations. The bridge plug setting tool is the actuator for setting the bridge plug and is one of the key tools in bridge-perforation combined operation.

[0003] Currently, bridge-perforation operations primarily employ propellant-based bridge plug setting tools. These tools rely on the high-pressure gas generated by the propellant to propel the tool itself into relative motion, thereby setting the bridge plug. However, the high combustion rate and large setting force of the propellant mean that upon release, the bridge plug setting tool is affected by recoil, causing the perforating gun to move in the opposite direction. This can potentially embed the flexible cable at the front of the tool string into the annulus between the tool string and the casing. If perforation operations are performed without assessing and ensuring the cable is fully stretched, the cable could be damaged or severed, leading to an engineering accident. Especially in upsloping casing wells, the tool string moves further in the opposite direction due to the combined effects of recoil and gravity, increasing the risk of the flexible cable embedding into the annulus. Therefore, it is crucial to accurately measure the backward movement distance of the tool string and propose corresponding safety measures. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a testing device, testing method, and application for measuring the distance of the bridge plug setting tool after release. This device can simulate real-world working conditions such as different uptilt angles, downhole pressures, bridge plug release forces, and tool string weights, and accurately measure the distance of the bridge plug setting tool after release. This allows for operation based on the measured distance and ensures safe operation of downhole cables, especially protecting the safety of bridge-shooting cables in uptilt casing wells.

[0005] This invention is achieved by adopting the following technical solution: A testing device for measuring the distance the bridge plug setting tool moves after being released, characterized in that: it includes a platform, a pressure-bearing sleeve, and a simulated tool string; the platform is provided with a strong magnetic block, a support frame for supporting the pressure-bearing sleeve, a driving component for tilting the pressure-bearing sleeve at different angles, and a measuring device for measuring the tilt angle of the pressure-bearing sleeve and the moving distance of the strong magnetic block; the pressure-bearing sleeve includes a sleeve, with pressure-bearing plugs movably connected to both ends of the sleeve, and the pressure-bearing plugs are provided with several connecting holes, which are respectively used to connect a manual pressure relief valve, a spring safety valve, a communication plug, and a hydraulic control system; the hydraulic control system is used to pump liquids of different pressures into the sleeve through the corresponding connecting holes; The simulation tool string includes a shear pin, a shear rod, a pusher, a bridge plug setting tool, an ignition sub, a high-voltage ignition wire, and a strong magnetic counterweight column. One end of the pusher is connected to the end of the bridge plug setting tool's cylinder, and the other end has several threaded holes for installing the shear pin. The tail end of the shear pin is fitted into a countersunk hole on the shear rod, which is connected to the end of the central rod of the bridge plug setting tool. The ignition sub is connected to the front end of the bridge plug setting tool's cylinder and has a circumferential side opening. The high-voltage ignition wire is led out from the center of the ignition sub and passes through the side opening to connect to the communication plug. The other end of the ignition sub has a cavity for installing strong magnetic counterweight columns with different adsorption forces.

[0006] The bottom of the pressure-bearing sleeve is also fixed with a sliding guide rail, and the strong magnetic block is fixed on the slider of the sliding guide rail and moves with the slider.

[0007] The driving component includes a hydraulic cylinder located at the bottom of the support frame, and the pressure-bearing sleeve is hinged to one end of the support frame; the hydraulic cylinder extends and retracts to push the pressure-bearing sleeve to tilt and rotate.

[0008] The measuring device includes an angle ruler installed at the hinge connection of the support frame and a scale ruler installed on one side of the sliding guide rail.

[0009] The cavity of the ignition section is also equipped with a limiting bolt for limiting the position of the strong magnetic counterweight column.

[0010] The pressure-bearing plug and the sleeve are connected by threads, and a sealing ring is used to seal the two.

[0011] It also includes a pressure gauge, and the connecting hole is connected to the pressure gauge and then connected to the hydraulic control system.

[0012] A method for testing the distance the bridge plug setting tool moves after being released, characterized by the following steps: Based on the simulated bridge plug release force, tool string weight, wellbore trajectory inclination angle, and downhole working pressure, determine the installation parameters, including the number of shear pins, the attraction force of the strong magnetic counterweight column, the inclination angle of the pressure casing, and the pumping pressure of the pressure casing. Install the test device for the backward displacement according to the installation parameters. After installation, record the initial position of the strong magnetic block. Pump high-pressure liquid into the pressure-bearing sleeve until the design pressure value is reached; Ignite the bridge plug setting tool through the electrical channel on the pressure bushing. After half an hour, when you hear the knocking sound, depressurize and record the final position of the strong magnetic block. The distance the bridge plug setting tool moves backward is determined to be the distance between the final position and the initial position of the strong magnetic block.

[0013] The test device for measuring the installation distance after installation specifically includes: connecting the push cylinder and shearing rod to the end of the assembled bridge plug setting tool, and installing the corresponding number of shearing pins; connecting the front end of the bridge plug setting tool to the ignition short section, placing a strong magnetic counterweight column of the corresponding size in the cavity, installing the upper limit bolt, and forming a simulated tool string; at the same time, connecting the high-voltage ignition wire to the ignition short section in advance and leading it out from the side hole. Unscrew the pressure plug with the communication plug from the pressure sleeve. Place the end of the simulation tool string with the strong magnetic counterweight column facing inward and slowly push it in until its shearing rod passes over the internal thread of the sleeve. Then connect the other end of the high-voltage ignition wire to the communication plug on the pressure plug and make sure it is waterproof. Then connect the pressure plug to the sleeve in place. At the same time, move the strong magnetic block to the strong magnetic counterweight column with the strongest attraction. Control the rotation and tilting of the pressure-bearing sleeve to the design angle.

[0014] The application of the bridge plug setting tool release distance is characterized by: measuring the bridge plug release force, tool string weight, downhole pressure, and bridge plug setting tool release distance under different wellbore trajectory inclination angles using the above-mentioned testing device or testing method, and plotting the change curve of the tool string's release distance under different upward inclination angles as a guide chart for field operations; Before preparing the bridge plug setting tool on site, record the cable depth MD2 at this time. At the same time, combine the curve of the change of the upward tilt angle and the backward movement distance corresponding to the actual setting position to estimate the backward movement distance △L of the bridge plug setting tool being released in advance. After confirming that the bridge plug setting tool has been released, slowly raise the cable. When the ground system shows that the tool string has moved, record the cable depth MD1 at this time. Take the difference △MD between the cable depths MD2 and MD1. When △MD is not less than the estimated backward movement distance △L, it is determined that the downhole cable has been completely straightened and no cable is embedded in the annulus between the tool string and the casing. The subsequent perforation operation can then proceed normally. When △MD is less than the estimated backward movement distance △L, it is determined that the downhole cable has not been completely straightened and some cable is embedded in the annulus between the tool string and the casing. The entire tool string should be raised to the vertical well section to ensure that the cable is completely straightened before pumping it again for perforation operation.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention can not only simulate real working conditions such as different uptilt angles, downhole pressures, bridge plug release forces, and tool string weights, but also accurately measure the backward movement distance of the bridge plug setting tool after release. In addition, based on the measured backward movement distance, it proposes to apply the backward movement distance obtained by this testing device or method to downhole cable safety operations, which can eliminate engineering accidents caused by the backward movement of the bridge plug setting tool, especially ensuring the safety of bridge-shooting combined cables in uptilt casing wells.

[0016] 2. The strong magnetic block is fixed on the slider of the sliding guide rail and moves with the slider. The movement of the strong magnetic block is made smoother by the cooperation of the slider and the sliding guide rail.

[0017] 3. The on-site operation guidance diagram also enables faster prediction of the backward movement distance of the bridge plug setting tool when it is released during on-site operations. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the present invention. Figure 2 This is a schematic diagram of the pressure-bearing sleeve and the simulated tool string in an inclined state, ready for the drop test in this invention; Figure 3 This is a schematic diagram of the pressure-bearing sleeve and the simulated tool string under tilted conditions after the drop test in this invention; Figure 4 This diagram illustrates the cable embedded between the tool string and the casing annulus when the downhole bridge plug setting tool is released and moved back; where a represents the cable in the stretched state in the vertical well section, b represents the casing, c represents the cable embedded between the tool string and the casing annulus, d represents the tool string, and e represents the set bridge plug. Marked in the image: 1. Platform; 1-1. Sliding guide rail; 1-2. Support frame; 1-3. Hydraulic cylinder; 1-4. Strong magnetic block; 1-5. Scale; 1-6. Angle ruler; 2. Pressure-bearing sleeve; 2-1. Pressure gauge; 2-2. Communication plug; 2-3. Pressure-bearing plug; 2-4. Sleeve; 2-5. Spring safety valve; 2-6. Manual pressure relief valve; 3. Simulation tool string; 3-1. Shearing pin; 3-2. Shearing rod; 3-3. Push cylinder; 3-4. Bridge plug setting tool; 3-5. Ignition short section; 3-6. High-pressure ignition wire; 3-7. Strong magnetic counterweight column. Detailed Implementation

[0019] Example 1 As a basic embodiment of the present invention, the present invention includes a testing device for measuring the distance of the bridge plug setting tool after release, used to simulate real working conditions such as different uptilt angles, downhole pressures, bridge plug release forces, and tool string weights, for accurately measuring the distance of the bridge plug setting tool 3-4 after release. The testing device includes a platform 1, a pressure-bearing casing 2, and a simulated tool string 3.

[0020] The platform 1 is equipped with strong magnetic blocks 1-4, a support frame 1-2 for supporting the pressure-bearing sleeve 2, a driving component for tilting the pressure-bearing sleeve 2 at different angles, and a measuring device for measuring the tilt angle of the pressure-bearing sleeve 2 and the moving distance of the strong magnetic blocks 1-4. In this embodiment, there are no restrictions on the structure of the driving component or the type of the measuring device, as long as the above functions can be achieved.

[0021] The pressure-bearing casing 2 includes a casing 2-4, with pressure-bearing plugs 2-3 movably connected to both ends of the casing 2-4. The pressure-bearing plugs 2-3 have several connecting holes for connecting a manual pressure relief valve 2-6, a spring safety valve 2-5, a communication plug 2-2, and a hydraulic control system. The hydraulic control system is used to pump liquids of different pressures into the casing 2-4 through the corresponding connecting holes to simulate working conditions with different downhole pressures.

[0022] The simulated tool string 3 includes a shear pin 3-1, a shear rod 3-2, a pusher 3-3, a bridge plug setting tool 3-4, an ignition short section 3-5, a high-voltage ignition wire 3-6, and a strong magnetic counterweight column 3-7. One end of the pusher 3-3 is connected to the end of the cylinder of the bridge plug setting tool 3-4, and the other end is provided with several threaded holes for installing the shear pin 3-1. The tail end of the shear pin 3-1 is fitted into the countersunk hole on the shear rod 3-2, and the shear rod 3-2 is connected to the end of the central rod of the bridge plug setting tool 3-4.

[0023] The ignition short section 3-5 is connected to the front end of the cylinder of the bridge plug setting tool 3-4. It has a side opening in the circumference. The high-voltage ignition wire 3-6 is led out from the center of the ignition short section 3-5 and passes through the side opening to connect to the communication plug 2-2. The other end of the ignition short section 3-5 is provided with a cavity for installing strong magnetic counterweights 3-7 with different adsorption forces.

[0024] Example 2 In a preferred embodiment of the present invention, the present invention includes a testing device for measuring the distance of movement after a bridge plug setting tool is released, comprising a platform 1, a pressure-bearing sleeve 2, and a simulated tool string 3. The platform 1 is equipped with a strong magnetic block 1-4, a support frame 1-2 for supporting the pressure-bearing sleeve 2, a driving component for tilting the pressure-bearing sleeve 2 at different angles, and a measuring device for measuring the tilt angle of the pressure-bearing sleeve 2 and the moving distance of the strong magnetic block 1-4. The support frame 1-2 may be plate-shaped, and the driving component may include hydraulic cylinders or pneumatic cylinders located at both ends of the support frame 1-2. The piston rod of the hydraulic cylinder or pneumatic cylinder is connected to the bottom of the support frame 1-2. By varying the extension and retraction of the piston rod, the support frame 1-2 and the pressure-bearing sleeve 2 located on the support frame 1-2 are tilted at different angles to simulate different upward tilt angles. The measuring device may be various measuring instruments, or a scale 1-5 and an angle gauge 1-6.

[0025] The side of the pressure-bearing sleeve 2 is also fixed with a sliding guide rail 1-1, and the strong magnetic block 1-4 can be fixed on the slider of the sliding guide rail 1-1 and move with the slider.

[0026] The pressure-bearing sleeve 2 includes a sleeve 2-4, with pressure-bearing plugs 2-3 movably connected to both ends of the sleeve 2-4. More specifically, the pressure-bearing plugs 2-3 and the sleeve 2-4 are connected by threads, and a sealing ring is used to seal between them. The pressure-bearing plugs 2-3 are provided with several connecting holes, which are used to connect a manual pressure relief valve 2-6, a spring safety valve 2-5, a communication plug 2-2, and a hydraulic control system, respectively. The hydraulic control system is used to pump liquids of different pressures into the sleeve 2-4 through the corresponding connecting holes.

[0027] The simulated tool string 3 includes a shearing pin 3-1, a shearing rod 3-2, a pusher 3-3, a bridge plug setting tool 3-4, an ignition short section 3-5, a high-voltage ignition wire 3-6, and a strong magnetic counterweight column 3-7.

[0028] One end of the pusher 3-3 is connected to the end of the cylinder of the bridge plug setting tool 3-4, and the other end is provided with several threaded holes for installing the shear pin 3-1. The tail end of the shear pin 3-1 is fitted into the countersunk hole on the shear rod 3-2, and the shear rod 3-2 is connected to the end of the central rod of the bridge plug setting tool 3-4.

[0029] The ignition short section 3-5 is connected to the front end of the cylinder of the bridge plug setting tool 3-4. It has a side opening in the circumference. The high-voltage ignition wire 3-6 is led out from the center of the ignition short section 3-5 and passes through the side opening to connect to the communication plug 2-2. The other end of the ignition short section 3-5 is provided with a cavity for installing strong magnetic counterweights 3-7 with different adsorption forces.

[0030] Example 3 In another preferred embodiment of the present invention, the present invention includes a method for testing the distance of movement after the bridge plug setting tool is released, comprising the following steps: Based on the simulated bridge plug release force, tool string weight, wellbore trajectory inclination angle, and downhole working pressure, the installation parameters are determined. These installation parameters include the number of shear pins 3-1, the attraction force of the strong magnetic counterweight column 3-7, the inclination angle of the pressure-bearing casing 2, and the pumping pressure of the pressure-bearing casing 2.

[0031] Install the displacement test device according to the installation parameters. After installation, record the initial positions of the strong magnetic blocks 1-4.

[0032] High-pressure liquid is pumped into the pressure-bearing sleeve 2 until the design pressure value is reached.

[0033] Ignite the bridge plug setting tool 3-4 through the electrical channel on the pressure sleeve 2. After half an hour, when you hear the knocking sound, depressurize and record the final position of the strong magnetic block 1-4.

[0034] Determine the backward movement distance of the bridge plug setting tool 3-4, specifically the distance between the final position and the initial position of the strong magnetic block 1-4.

[0035] Example 4 As the preferred embodiment of the present invention, please refer to the appendix to the specification. Figure 1 This invention includes a testing device for measuring the distance a bridge plug setting tool moves after being released, comprising a platform 1, a pressure-bearing sleeve 2, and a simulated tool string 3. The platform 1 includes a sliding guide rail 1-1, a support frame 1-2, a driving component, a strong magnetic block 1-4, and a measuring device. The driving component can be a hydraulic cylinder 1-3, and the measuring device can be a scale 1-5 and an angle ruler 1-6.

[0036] The sliding guide rail 1-1 is fixed to the bottom of the pressure-bearing sleeve 2, and the strong magnetic block 1-4 is fixed on the slider of the sliding guide rail 1-1 and moves with the slider. At the same time, a scale 1-5 is set on one side of the sliding guide rail 1-1 to indicate the moving distance of the strong magnetic block 1-4.

[0037] Hydraulic cylinder 1-3 is located at the bottom of support frame 1-2. Its extension and retraction are achieved through a hydraulic control system, thereby causing the pressure-bearing sleeve 2, which is hinged to one end of support frame 1-2, to tilt and rotate with the sliding guide rail 1-1. At the same time, an angle gauge 1-6 is provided at the hinge connection of support frame 1-2 to indicate the tilt angle of pressure-bearing sleeve 2.

[0038] The pressure-bearing sleeve 2 includes a pressure gauge 2-1, a communication plug 2-2, a pressure-bearing plug 2-3, a sleeve 2-4, a spring safety valve 2-5, and a manual pressure relief valve 2-6.

[0039] The casing 2-4 uses a common type of casing used in oil and gas wells, with threaded connections and sealing surfaces machined at both ends. Its length is determined based on the type and length of the bridge plug setting tool 3-4. Pressure-bearing plugs 2-3 are located at both ends of the casing 2-4, using threaded connections and sealing rings, and are fixed to the platform 1. The pressure-bearing plug 2-3 near the angle gauge 1-6 has two connecting holes. One connects to the manual pressure relief valve 2-6, serving as a pressure relief channel for the pressure-bearing casing 2; the other connects to the spring safety valve 2-5, ensuring that the maximum working internal pressure of the pressure-bearing casing 2 does not exceed its safe pressure-bearing capacity. The pressure-bearing plug 2-3 at the other end also has two connecting holes. One connects to the pressure gauge 2-1 and is connected to the hydraulic control system, serving as a pressure inlet channel for the pressure-bearing casing 2; the other connects to the communication plug 2-2, which has both energizing and pressure-bearing functions, serving as the electrical channel for the energized bridge plug setting tool 3-4. By pumping clean water at different pressures into the pressure inlet channel of the pressure casing 2, working conditions with different downhole pressures are simulated.

[0040] The simulated tool string 3 includes a shearing pin 3-1, a shearing rod 3-2, a pusher 3-3, a bridge plug setting tool 3-4, an ignition short section 3-5, a high-voltage ignition wire 3-6, and a strong magnetic counterweight column 3-7.

[0041] The pusher 3-3 is threadedly connected to the end of the bridge plug setting tool 3-4. The end of the pusher 3-3 has several threaded holes for installing shear pins 3-1. The tail end of the shear pin 3-1 is fitted into a countersunk hole on the shear rod 3-2, which is threadedly connected to the end of the central rod of the bridge plug setting tool 3-4. By installing a certain number of shear pins 3-1, the release force of different bridge plugs is simulated.

[0042] The ignition sub-section 3-5 is threaded to the front end of the bridge plug setting tool 3-4. A circumferential side opening is provided. The high-pressure ignition wire 3-6 is led out from the center of the ignition sub-section 3-5, passes through the side opening, and connects to the communication plug 2-2 of the pressure-bearing sleeve 2. The other end of the ignition sub-section 3-5 has a cavity for installing a strong magnetic counterweight column 3-7, which is bolted in place. Installing strong magnetic counterweight columns 3-7 with different adsorption forces simulates tool strings of different weights.

[0043] A test method for a test device utilizing the aforementioned bridge plug setting tool's displacement distance after release is provided in the appendix of the instruction manual. Figure 2 ~Instruction manual included Figure 3 This includes the following steps: Based on the simulated bridge plug release force, tool string weight, wellbore trajectory inclination angle, and downhole working pressure, the installation parameters are determined. These installation parameters include the number of shear pins 3-1, the adsorption force of the strong magnetic counterweight column 3-7, the inclination angle of the pressure-bearing casing 2, and the pumping pressure of the pressure-bearing casing 2.

[0044] Install the test device for the backward displacement distance according to the installation parameters. After installation, record the initial position of the strong magnetic block 1-4. Specifically, this includes: connecting the push cylinder 3-3 and the shearing rod 3-2 to the end of the assembled bridge plug setting tool 3-4, and installing the corresponding number of shearing pins 3-1; connecting the front end of the bridge plug setting tool 3-4 to the ignition short section 3-5, and placing a strong magnetic counterweight column 3-7 of the corresponding size in the cavity, and installing the upper limit bolt to form the simulated tool string 3. At the same time, connect the high-voltage ignition wire 3-6 to the ignition short section 3-5 in advance and lead it out from the side hole.

[0045] Unscrew the pressure-bearing plug 2-3 with the communication plug 2-2 from the pressure-bearing sleeve 2. Place the simulation tool string 3 with one end of the strong magnetic counterweight column 3-7 facing inward and slowly push it in until its shearing rod 3-2 passes over the internal thread of the sleeve 2-4. Then connect the other end of the high-voltage ignition wire 3-6 to the communication plug 2-2 on the pressure-bearing plug 2-3 and make sure it is waterproof. Then connect the pressure-bearing plug 2-3 to the sleeve 2-4 in place. At the same time, slide the strong magnetic block 1-4 on the sliding guide rail 1-1 to the strong magnetic counterweight column 3-7 with the strongest attraction force.

[0046] The hydraulic cylinder 1-3 is extended by controlling the hydraulic control system until the angle scale 1-6 shows that the pressure sleeve 2 has rotated and tilted to the designed angle. At the same time, the value L1 on the scale 1-5 where the strong magnetic block 1-4 on the sliding guide rail 1-1 is located is recorded.

[0047] Close the manual pressure relief valve 2-6 on the pressure sleeve 2, and slowly pump high-pressure liquid through the pressure inlet channel until the pressure gauge 2-1 displays the design pressure value and then stop.

[0048] Ignite the bridge plug setting tool 3-4 through the electrical channel on the pressure sleeve 2. After half an hour, when you hear the knocking sound, open the manual pressure relief valve 2-6 on the pressure sleeve 2 to release the pressure. Record the value L2 on the scale 1-5 where the strong magnetic block 1-4 on the sliding guide 1-1 is located. Finally, control the hydraulic control system to retract the hydraulic cylinder 1-3 until the angle scale 1-6 shows that the pressure sleeve 2 has rotated and returned to the horizontal position.

[0049] Unscrew the pressure plug 2-3 with the communication plug 2-2 from the pressure sleeve 2, take out the simulation tool string 3, and take the difference △L between the values ​​L2 and L1 as the backward movement distance of the bridge plug setting tool 3-4, thus completing the test of the backward movement distance of the bridge plug setting tool 3-4 under the given real working conditions.

[0050] For the application of the bridge plug setting tool's post-release movement distance measured by the above-mentioned testing device or method, please refer to the appendix of the instruction manual. Figure 4 Specifically, its application in underground cable safety operations includes the following steps: The bridge plug release force, tool string weight, downhole pressure, and bridge plug setting tool release distance under different wellbore inclination angles are measured using the above-mentioned testing equipment or methods. The tool string's backward movement distance variation curve under different upward inclination angles is plotted as a guide chart for field operations.

[0051] Before preparing the bridge plug setting tool on site, record the cable depth MD2 at this time. At the same time, combine the curve of the change of the upward tilt angle and the backward movement distance corresponding to the actual setting position to estimate the backward movement distance △L of the bridge plug setting tool when it is released.

[0052] After confirming that the bridge plug setting tool has been released, slowly raise the cable. When the ground system shows that the tool string has moved, record the cable depth MD1 at this time.

[0053] Take the difference △MD between the cable depths MD2 and MD1. When △MD is not less than the estimated backward movement distance △L, it is determined that the downhole cable has been completely straightened and no cable is embedded in the annulus between the tool string and the casing. Subsequent perforation operations can be carried out normally. When △MD is less than the estimated backward movement distance △L, it is determined that the downhole cable has not been completely straightened and some cable is embedded in the annulus between the tool string and the casing. The entire tool string is raised to the vertical well section to ensure that the cable is completely straightened before pumping it again for perforation operations.

[0054] In summary, any other corresponding modifications made by those skilled in the art after reading this invention document, without requiring creative mental effort, based on the technical solutions and concepts of this invention, are all within the scope of protection of this invention.

Claims

1. A testing device for the distance the bridge plug setting tool moves after being released, characterized in that: The system includes a platform (1), a pressure-bearing sleeve (2), and a simulation tool string (3). The platform (1) is equipped with a strong magnetic block (1-4), a support frame (1-2) for supporting the pressure-bearing sleeve (2), a drive mechanism for tilting the pressure-bearing sleeve (2) at different angles, and a measuring device for measuring the tilt angle of the pressure-bearing sleeve (2) and the moving distance of the strong magnetic block (1-4). The pressure-bearing sleeve (2) includes a sleeve (2-4), with pressure-bearing plugs (2-3) movably connected to both ends of the sleeve (2-4). -3) is provided with several connecting holes, which are used to connect the manual pressure relief valve (2-6), the spring safety valve (2-5), the communication plug (2-2) and the hydraulic control system respectively. The hydraulic control system is used to pump liquids of different pressures into the sleeve (2-4) through the corresponding connecting holes; the simulation tool string (3) includes a shearing pin (3-1), a shearing rod (3-2), a pusher (3-3), a bridge plug setting tool (3-4), an ignition short section (3-5), a high-pressure ignition wire (3-6) and a strong magnetic counterweight column (3-7). One end of the pusher (3-3) is connected to the end of the barrel of the bridge plug setting tool (3-4), and the other end is provided with several threaded holes for installing the shear pin (3-1). The tail end of the shear pin (3-1) is fitted into the countersunk hole on the shear rod (3-2), and the shear rod (3-2) is connected to the end of the central rod of the bridge plug setting tool (3-4). The ignition short section (3-5) is connected to the front end of the barrel of the bridge plug setting tool (3-4), and is provided with a side opening in the circumferential direction. The high-voltage ignition wire (3-6) is led out from the center of the ignition short section (3-5) and passes through the side opening to connect to the communication plug (2-2). The other end of the ignition short section (3-5) is provided with a cavity for installing strong magnetic counterweights (3-7) with different adsorption forces. The bottom of the pressure-bearing sleeve (2) is also fixed with a sliding guide rail (1-1), and the strong magnetic block (1-4) is fixed on the slider of the sliding guide rail (1-1) and moves with the slider; during installation, the strong magnetic block (1-4) is placed at the strong magnetic counterweight column (3-7) with the strongest adsorption force.

2. The testing device for the distance of movement after the bridge plug setting tool is released according to claim 1, characterized in that: The driving component includes a hydraulic cylinder (1-3) located at the bottom of the support frame (1-2), and the pressure-bearing sleeve (2) is hinged to one end of the support frame (1-2); the hydraulic cylinder (1-3) extends and retracts to push the pressure-bearing sleeve (2) to tilt and rotate.

3. The testing device for the distance of movement after the bridge plug setting tool is released according to claim 2, characterized in that: The measuring device includes an angle ruler (1-6) installed at the hinge connection of the support frame (1-2) and a scale ruler (1-5) installed on one side of the sliding guide rail (1-1).

4. The testing device for the distance of movement after the bridge plug setting tool is released according to claim 1, characterized in that: The cavity of the ignition section (3-5) is also provided with a limiting bolt for limiting the position of the strong magnetic counterweight column (3-7).

5. The testing device for the distance of movement after the bridge plug setting tool is released according to claim 1, characterized in that: The pressure-bearing plug (2-3) and the sleeve (2-4) are connected by threads, and a sealing ring is used to seal between them.

6. The testing device for the distance of movement after the bridge plug setting tool is released according to claim 1, characterized in that: It also includes a pressure gauge (2-1), and after the connecting hole is connected to the pressure gauge (2-1), it is connected to the hydraulic control system.

7. A method for testing the distance the bridge plug setting tool moves after being released, characterized in that: The test is based on the testing device for the distance of the bridge plug setting tool after being released, as described in any one of claims 1 to 6, and the testing method includes the following steps: Based on the simulated bridge plug release force, tool string weight, wellbore trajectory inclination angle and downhole working pressure, determine the installation parameters, including the number of shear pins (3-1), the adsorption force of the strong magnetic counterweight column (3-7), the inclination angle of the pressure casing (2) and the pumping pressure of the pressure casing (2); Install the test device for the backward displacement according to the installation parameters. After installation, record the initial position of the strong magnetic blocks (1-4). Pump high-pressure liquid into the pressure-bearing sleeve (2) until the design pressure value is reached; Ignite the bridge plug setting tool (3-4) through the electrical channel on the pressure bushing (2). After half an hour of hearing the knocking sound, depressurize and record the final position of the strong magnetic block (1-4). The distance the bridge plug setting tool (3-4) moves backward is determined to be the distance between the final position and the initial position of the strong magnetic block (1-4).

8. The method for testing the distance the bridge plug setting tool moves after being released according to claim 7, characterized in that: The testing device for the installation backward movement distance specifically includes: Connect the pusher (3-3) and shearing rod (3-2) to the end of the assembled bridge plug setting tool (3-4), and install the corresponding number of shearing pins (3-1); connect the front end of the bridge plug setting tool (3-4) to the ignition short section (3-5), and place a corresponding size strong magnetic counterweight column (3-7) in the cavity, install the upper limit bolt, and form a simulated tool string (3); at the same time, connect the high-voltage ignition wire (3-6) to the ignition short section (3-5) in advance and lead it out from the side hole; Unscrew the pressure plug (2-3) with the communication plug (2-2) from the pressure sleeve (2). Place the end of the simulation tool string (3) with the strong magnetic counterweight column (3-7) facing inward and slowly push it in until its shearing rod (3-2) passes through the internal thread of the sleeve (2-4). Then connect the other end of the high-voltage ignition wire (3-6) to the communication plug (2-2) on the pressure plug (2-3) and make sure it is waterproof. Then connect the pressure plug (2-3) to the sleeve (2-4) in place. At the same time, move the strong magnetic block (1-4) to the strong magnetic counterweight column (3-7) with the strongest attraction. Control the pressure-bearing sleeve (2) to rotate and tilt to the design angle.

9. The application of the distance the bridge plug setting tool moves after being released, characterized in that: The bridge plug release force, tool string weight, downhole pressure, and bridge plug setting tool (3-4) rear movement distance after release under different wellbore trajectory inclination angles were measured using the test method described in claim 8. The rear movement distance variation curve of the tool string under different up-tilt well inclination angles was plotted as a guide chart for field operations. Before preparing the bridge plug setting tool (3-4) on site, record the cable depth MD2 at this time. At the same time, combine the curve of the change of the upward tilt angle and the backward movement distance corresponding to the actual setting position to estimate the backward movement distance △L of the bridge plug setting tool (3-4) when it is lost. After confirming that the bridge plug setting tool (3-4) has been released, slowly raise the cable. When the ground system shows that the tool string has moved, record the cable depth MD1 at this time. Take the difference △MD between the cable depths MD2 and MD1. When △MD is not less than the estimated backward movement distance △L, it is determined that the downhole cable has been completely straightened and no cable is embedded in the annulus between the tool string and the casing. The subsequent perforation operation can then proceed normally. When △MD is less than the estimated backward movement distance △L, it is determined that the downhole cable has not been completely straightened and some cable is embedded in the annulus between the tool string and the casing. The entire tool string should be raised to the vertical well section to ensure that the cable is completely straightened before pumping it again for perforation operation.

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