Connecting device for large-size packer setting tool

Abstract

The invention is applicable to the technical field of downhole tools, and provides a connecting device for a large-size packer setting tool, which comprises a sleeve, and a packing assembly, a connecting piece and a shear pin are arranged on one side of the sleeve. The extrusion assembly is used for extruding the packing assembly and the shear pin; the packer lowering monitoring module is used for monitoring packer state data and fluid data; the shear pin state analysis module is used for generating an advanced fracture risk value; the shear pin advanced fracture risk early warning module is used for judging whether the shear pin has an advanced fracture risk or not; the lowering speed adjustment value generation module is used for generating a lowering speed adjustment value; the lowering speed adjustment module is used for controlling the lowering speed of the packer; the connecting device can be conveniently unlocked through the clamping piece, the descending speed of the packer can be adjusted according to the state of the shear pin, the situation that the packer is set in advance due to the fact that the shear pin is broken in advance is prevented, and therefore the positioning accuracy of the packer is improved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools, and in particular to a connecting device for a large-size packer setting tool. Background Art

[0002] In water injection well operations, the main function of the connecting device is to connect the large-size packer with the setting tool and downhole equipment such as the oil pipe to form a complete working system, ensuring that the large-size packer can be accurately transported to the predetermined position.

[0003] Shear pins are usually designed on the connection device. During the setting process of the large-size packer, the shear pins play an important role in controlling the timing of the setting. When the large-size packer is lowered to the predetermined position and subjected to sufficient pressure, the shear pins will be sheared off, thereby triggering the setting action of the packer.

[0004] However, in actual applications, the setting process of large-size packers often faces many challenges, one of which is the premature setting of the packer due to premature breakage of the shear pins. This will not only affect the positioning accuracy of the packer, but may also cause damage to downhole equipment and even cause safety accidents. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a connection device for a large-size packer setting tool, aiming to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides a connection device for a large-size packer setting tool, comprising a casing, the casing being sleeved on an oil pipe, a packer assembly being provided on one side of the casing, and further comprising:

[0007] A connecting piece, the connecting piece is arranged on one side of the sleeve and is slidably connected to the sleeve;

[0008] A shear pin, wherein the shear pin is disposed between the connector and the casing, one end of the shear pin is inserted and connected with the connector, and the other end of the shear pin is inserted and connected with the casing;

[0009] An extrusion assembly, used for extruding the packing assembly and the shear pin; a detachable connection structure is provided between the extrusion assembly and the packing assembly;

[0010] The packer lowering monitoring module is used to monitor the status data of the packer and the fluid data of the location of the packer in the well in real time; the status data includes the lowering speed, lowering depth and temperature value, and the fluid data includes the fluid viscosity and fluid pressure;

[0011] A shear pin state analysis module is used to establish a premature fracture risk assessment model for the shear pin, substitute the state data of the packer and the fluid data of the location of the packer in the well into the premature fracture risk assessment model, and generate a premature fracture risk value for the shear pin;

[0012] A shear pin premature fracture risk warning module, used to determine whether the shear pin has a risk of premature fracture according to the premature fracture risk value of the shear pin;

[0013] A lowering speed adjustment value generating module generates a lowering speed adjustment value according to the risk value of early fracture of the shear pin if the shear pin has a risk of early fracture; the lowering speed adjustment value refers to the lowering speed required to be adjusted during the process of the packer from the wellhead to the specified depth;

[0014] The lowering speed adjustment module is used to control the lowering speed of the packer by the packer lowering mechanism according to the lowering speed adjustment value.

[0015] As a preferred embodiment of the present invention, the connection device for a large-size packer setting tool further includes:

[0016] A four-petal claw, wherein the four-petal claw is slidably arranged on one side of the sleeve and one end of the four-petal claw is fixedly connected to the connecting member;

[0017] A lower connector is arranged on one side of the sleeve, and one side of the lower connector is abutted and connected with one end of the four-petal claw.

[0018] As a preferred embodiment of the present invention, the extrusion assembly comprises:

[0019] An extrusion piece, wherein the extrusion piece is slidably disposed on one side of the sleeve;

[0020] The clamping piece is fixedly arranged on one side of the extrusion piece.

[0021] As a preferred embodiment of the present invention, the sealing assembly comprises:

[0022] A sealing rubber cylinder, wherein the sealing rubber cylinder is arranged on one side of the connecting piece;

[0023] A locking ring, the locking ring being arranged on one side of the sealing rubber cylinder;

[0024] A connecting groove, wherein the connecting groove is provided on the locking ring, and the locking ring is inserted and slidably connected with the clamping member through the connecting groove;

[0025] A magnetic attraction member is fixedly disposed in the connecting groove.

[0026] As a preferred embodiment of the present invention, the early fracture risk value of the shear pin is obtained in the following manner:

[0027] Establishing a premature fracture risk assessment model for the shear pin, obtaining a lowering speed assessment index, a lowering depth assessment index, a smoothness influence index, and a fluid pressure influence index of the packer, substituting the lowering speed assessment index, the lowering depth assessment index, the smoothness influence index, and the fluid pressure influence index into the premature fracture risk assessment model, and generating a premature fracture risk value Q of the shear pin;

[0028] Among them, the expression of the premature fracture risk assessment model is:

[0029] ;

[0030] In the expression, S represents the lowering speed evaluation index, N represents the fluid influence index, C represents the temperature influence index, M represents the smoothness influence index, and a1, a2, and a3 are all weight coefficients;

[0031] Among them, the smoothness influence index is obtained as follows:

[0032] Obtaining the minimum radius of the wellbore cross section where the packer is about to reach, and comparing the minimum radius of the wellbore cross section where the packer is about to reach with the theoretical radius of the wellbore cross section;

[0033] If the minimum radius of the well wall cross section is smaller than the theoretical radius of the well wall cross section, it is marked as a convexity; wherein the theoretical radius of the well wall cross section refers to the theoretical radius of the well wall cross section in a smooth state;

[0034] By formula , the convex width L at the generated convex c ; Raised width L c It refers to the difference between the minimum radius of the wellbore cross section and the theoretical radius, and the difference is a positive number;

[0035] In the formula, L1 represents the minimum radius of the wellbore cross section, and L0 represents the theoretical radius of the wellbore cross section;

[0036] The convex width L c Perform difference processing with the uplift width threshold to generate a collision difference; the uplift width threshold refers to the maximum width between the outer wall of the packer and the well wall;

[0037] The collision difference is compared with the bulge width threshold to generate the wellbore smoothness impact index.

[0038] As a preferred embodiment of the present invention, the lowering speed evaluation index is obtained as follows:

[0039] Compare the packer lowering speed with the lowering speed threshold. If the lowering speed is higher than the lowering speed threshold, the speed is marked as an overspeed. The lowering speed threshold refers to the maximum value of the packer lowering speed safety range. The packer lowering speed safety range refers to the range of lowering speeds within which the packer can maintain a stable state during the lowering process.

[0040] Perform difference processing on the overspeed speed and the lowered speed threshold to generate an overspeed value;

[0041] The overspeed value is processed by ratio with the lowering speed threshold to generate an overspeed factor;

[0042] The difference between the current lowering speed and the most recent historical lowering speed is calculated to generate the real-time speed change value of the packer; the historical lowering speed refers to the historical monitoring data obtained by the speed sensor at the most recent time point;

[0043] Based on Newton's second law, the acceleration force value of the shear pin is generated according to the real-time velocity change value; the acceleration force value refers to the thrust generated by the connecting member on the shear pin due to the velocity change;

[0044] Calculate the ratio of the acceleration force value to the maximum force value of the shear pin to obtain the acceleration factor;

[0045] The overspeed factor and the acceleration factor are weighted and summed to obtain the lowering speed assessment index.

[0046] As a preferred embodiment of the present invention, the temperature impact index is obtained in the following manner:

[0047] Compare the temperature value with the temperature safety range, and if the temperature value is not within the temperature safety range, mark the temperature as an over-temperature;

[0048] Perform difference processing between the over-temperature and the nearest endpoint of the temperature safety range to generate a temperature difference value;

[0049] The temperature difference value is compared with the nearest end point of the temperature safety range to generate a temperature difference factor;

[0050] According to historical monitoring data, obtain the duration of over-temperature and mark it as over-temperature duration;

[0051] Performing difference processing on the over-temperature duration and the over-temperature bearing safety duration of the shear pin to generate an over-temperature duration difference;

[0052] The over-temperature duration difference is processed by ratio with the over-temperature tolerance safety duration of the shear pin to generate an over-temperature duration factor;

[0053] The temperature difference factor and the over-temperature duration factor are weighted and summed to generate the temperature impact index.

[0054] As a preferred embodiment of the present invention, the fluid influence index is obtained in the following manner:

[0055] According to the descending depth of the packer, the depth of the packer in the fluid is obtained;

[0056] Based on the hydrostatic pressure theory, the pressure exerted by the fluid on the packer is generated according to the depth of the packer in the fluid and is marked as fluid pressure;

[0057] Performing differential processing on the fluid pressure and the maximum value of the theoretical pressure range of the shear pin to generate a pressure difference;

[0058] The pressure difference is compared with the maximum value of the theoretical pressure range to generate a pressure factor;

[0059] Obtaining the viscosity of the fluid at the location of the packer, and generating the resistance of the fluid to the packer according to the contact area between the connector and the four-petal claw and the fluid and the packer lowering speed;

[0060] Based on mechanical conversion, the resistance is converted into the force exerted by the connecting member on the shear pin according to the friction between the connecting member and the casing;

[0061] Performing difference processing on the applied force and the maximum value of the theoretical bearing capacity range of the shear pin to generate an applied force difference;

[0062] The force difference is processed by ratioing the maximum value of the theoretical bearing force range of the shear pin to generate a viscosity factor;

[0063] The pressure factor and the viscosity factor are weighted and summed to generate the fluid influence index.

[0064] As a preferred embodiment of the present invention, the early warning method of the shear pin early fracture risk warning module is:

[0065] The premature fracture risk value Q is compared with the premature fracture risk threshold. If the premature fracture risk value Q is greater than or equal to the premature fracture risk threshold, it means that the higher the premature fracture risk value Q is, the greater the risk of premature fracture of the shear pin is. A judgment result is generated, and the judgment result is that the risk of premature fracture of the shear pin is too high; wherein the premature fracture risk threshold refers to the maximum value of the safety range of the premature fracture risk of the shear pin.

[0066] As a preferred embodiment of the present invention, the lowering speed adjustment value is obtained in the following manner:

[0067] Establish a lowering speed adjustment analysis model, substitute the current lowering speed and premature fracture risk value Q into the lowering speed generation speed adjustment analysis model, and generate the lowering speed adjustment value Ts;

[0068] Among them, the expression of the lowering speed adjustment analysis model is:

[0069] ;

[0070] Among them, V represents the current lowering speed of the packer, and Q represents the risk value of premature fracture of the shear pin.

[0071] The present invention can facilitate the unlocking of the connecting device and the large-size packer and the setting tool through the clamping parts, and can also analyze the status of the shear pin and issue an early warning, and timely adjust the lowering speed of the packer through the early warning information to prevent the packer from being set prematurely due to premature breakage of the shear pin, thereby improving the positioning accuracy of the packer during the setting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 A three-dimensional structural diagram of a connection device for a large-size packer setting tool provided in an embodiment of the present invention;

[0073] Figure 2 A cross-sectional view of a connection device for a large-size packer setting tool provided in an embodiment of the present invention;

[0074] Figure 3 A schematic diagram of a partial structure of a connecting device for a large-size packer setting tool provided by an embodiment of the present invention;

[0075] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0076] Figure 5 for Figure 2 A partial enlarged view of point A in the middle.

[0077] In the attached drawings: 1, casing; 2, oil pipe; 3, extrusion assembly; 4, setting tool; 5, isolation assembly; 6, well wall; 302, extrusion piece; 303, clamping piece; 401, four-petal claw; 402, lower connecting piece; 403, connecting piece; 404, shear pin; 501, sealing rubber tube; 502, locking ring; 503, connecting groove; 504, magnetic suction piece. DETAILED DESCRIPTION

[0078] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0079] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0080] like Figure 1 As shown, it is a structural diagram of a connection device for a large-size packer setting tool provided by an embodiment of the present invention, comprising a casing 1, an oil pipe 2 and a well wall 6, wherein the casing 1 is arranged on one side of the oil pipe 2 and is slidably connected to the oil pipe 2, a packer assembly 5 is arranged on one side of the oil pipe 2, an extrusion assembly 3 is arranged on one side of the packer assembly 5, and a setting tool 4 is arranged on one side of the packer assembly 5;

[0081] Specifically, the casing 1 is driven by the surface equipment to slide along the outer wall of the oil pipe 2, and the casing 1 drives the extrusion assembly 3 and the setting tool 4 to perform linear movement. At the same time, due to gravity and friction, the packing assembly 5 follows the setting tool 4 to perform synchronous linear movement. When the device reaches the specified position, the extrusion assembly 3 is pressed to slide linearly along the casing 1. While the extrusion assembly 3 is sliding linearly, the extrusion assembly 3 pushes the setting tool 4 to slide linearly, so that the setting tool 4 is in contact with the well wall 6, and then the extrusion assembly 3 is continuously pressed. Since the setting tool 4 no longer moves, the extrusion assembly 3 will compress the packing assembly 5, causing the packing assembly 5 to deform, so that the packing assembly 5 is in contact with the well wall 6, and the well wall 6 is sealed.

[0082] It should be explained that the method of applying pressure to the extrusion assembly 3 includes but is not limited to setting a threaded rod on the extrusion assembly 3 and driving the extrusion assembly 3 to perform linear motion by rotating the threaded rod, throwing a steel ball into the well wall 6 from the wellhead, and driving the extrusion assembly 3 to perform linear motion by the action of gravity, etc.

[0083] like Figure 2 , Figure 4 and Figure 5 As shown, the extrusion assembly 3 includes:

[0084] An extrusion piece 302, wherein the extrusion piece 302 is slidably disposed on one side of the sleeve 1, and a lowering mechanism is connected to the extrusion piece 302, one end of which is fixedly connected to the extrusion piece 302, for maintaining the lifting of the extrusion piece 302;

[0085] The clamping member 303 is fixedly disposed on one side of the extrusion member 302 .

[0086] The sealing assembly 5 comprises:

[0087] A sealing rubber tube 501, wherein the sealing rubber tube 501 is arranged on the outer wall of the oil pipe 2;

[0088] A locking ring 502, wherein the locking ring 502 is disposed on one side of the sealing rubber tube 501, a limiting ring is provided on one side of the locking ring 502, and a rotation limiting member is provided between the locking ring 502 and the connecting member 403;

[0089] A connecting groove 503, wherein the connecting groove 503 is provided on the locking ring 502, and the locking ring 502 is inserted and slidably connected with the clamping member 303 through the connecting groove 503;

[0090] A magnetic member 504, wherein the magnetic member 504 is fixedly disposed in the connecting groove 503;

[0091] The clamping member 303 and the connecting groove 503 are detachably connected. By rotating the extrusion member 302, when the rotation angle reaches a set angle, the extrusion member 302 is pulled in the vertical direction, and the extrusion member 302 drives the clamping member 303 to be separated from the connecting groove 503, so that the clamping member 303 and the connecting groove 503 can be detached.

[0092] Specifically, when pressure is applied to the extrusion assembly 3, the extrusion piece 302 in the extrusion assembly 3 will perform linear movement, and the extrusion piece 302 will push the locking ring 502 to perform linear movement. When the locking ring 502 performs linear movement, the locking ring 502 will squeeze one side of the sealing rubber tube 501, causing the sealing rubber tube 501 to deform, and finally the sealing rubber tube 501 is in contact with the well wall 6 to complete the sealing of the well wall 6; when the well wall 6 is sealed, the extrusion piece 302 is rotated by the lowering mechanism, and the extrusion piece 302 drives the clamping piece 303 to slide along the connecting groove 503, and then the extrusion piece 302 is driven by the lowering mechanism to perform linear movement in the vertical direction, so that the extrusion piece 302 drives the clamping piece 303 to disengage from the connecting groove 503, completing the recovery function of the extrusion assembly 3. This operation can quickly recover the extrusion assembly 3 and improve the working efficiency of the device;

[0093] In addition, one side of the magnetic component 504 arranged in the connecting groove 503 is a magnetic surface, so that one side of the clamping component 303 is magnetically connected to the magnetic component 504, and the magnetic force can prevent the clamping component 303 from sliding easily in the connecting groove 503. When the extrusion component 302 is rotated by the lowering mechanism, and the rotational force is greater than the magnetic force of the magnetic component 504, the magnetic connection between the clamping component 303 and the magnetic component 504 will be disconnected, thereby completing the recovery of the extrusion component 3.

[0094] like Figure 2 and Figure 5 As shown, the setting tool 4 includes:

[0095] A four-petal claw 401, wherein the four-petal claw 401 is slidably disposed on one side of the sleeve 1 and one end of the four-petal claw 401 is fixedly connected to the connecting member 403;

[0096] A lower connector 402, wherein the lower connector 402 is disposed on one side of the sleeve 1, and one side of the lower connector 402 is in contact with one end of the four-petal claw 401;

[0097] A connecting member 403, wherein the connecting member 403 is disposed on one side of the sleeve 1 and is slidably connected to the sleeve 1;

[0098] A shear pin 404, wherein the shear pin 404 is disposed between the connector 403 and the casing 1, wherein one end of the shear pin 404 is inserted and connected to the connector 403, and the other end of the shear pin 404 is inserted and connected to the casing 1;

[0099] Specifically, when the extrusion member 302 is subjected to pressure and performs linear motion, the extrusion member 302 will apply a force in the same direction of motion to the connection member 403, so that the connection member 403 applies pressure to the shear pin 404. When the pressure applied by the connection member 403 on the shear pin 404 is greater than the ultimate bearing pressure of the shear pin 404, the shear pin 404 will break, ending the support of the shear pin 404 on the connection member 403. The connection member 403 will continue to slide along the outer wall of the casing 1 due to gravity, and the connection member 403 will drive the four-petal claw 401 to slide along the outer wall of the casing 1. When the four-petal claw 401 slides, one end of the four-petal claw 401 contacts and connects with the lower connection member 402. If the extrusion member 302 is continuously pressed, the connection member 403 will be pressed against the lower connection member 402. The extrusion member 302 applies pressure, and the extrusion member 302 continues to push the connecting member 403 to slide, and the connecting member 403 drives the four-petal claw 401 to slide. Since one side of the lower connecting member 402 is an inclined surface, the claw head of the four-petal claw 401 continues to slide along the inclined surface. At this time, the four-petal claw 401 continues to deform, so that the width of one side of the four-petal claw 401 from the well wall 6 continues to decrease, until the claw head of the four-petal claw 401 is in contact with the well wall 6 and connected. Due to the friction between the four-petal claw 401 and the well wall 6, the four-petal claw 401 stops sliding; at the same time, continuously applying pressure to the extrusion member 302 will cause the extrusion member 302 to drive the locking ring 502 to slide, and the locking ring 502 compresses the sealing rubber tube 501 to complete the sealing of the well wall 6.

[0100] Preferably, the locking ring 502 and one side of the connecting piece 403 are respectively provided with mutually engaging convex strips. When the extrusion assembly 3 is recovered, the locking ring 502 relies on the friction force generated by the mutually engaging convex strips to offset the thrust generated by the sealing rubber tube 501 on the locking ring 502 due to its own elasticity, so that the sealing rubber tube 501 can continue to be in contact with the well wall 6 and maintain the sealing of the isolation point.

[0101] The present invention provides a connection device for a large-size packer setting tool, which also includes:

[0102] The packer lowering monitoring module is used to monitor the status data of the packer and the fluid data of the location of the packer in the well in real time; the status data includes the lowering speed, lowering depth and temperature value, and the fluid data includes the fluid viscosity and fluid pressure;

[0103] A shear pin state analysis module is used to establish a premature fracture risk assessment model for the shear pin 404, substitute the state data of the packer and the fluid data of the location of the packer in the well into the premature fracture risk assessment model, and generate a premature fracture risk value for the shear pin 404;

[0104] A shear pin premature fracture risk warning module is used to determine whether the shear pin 404 has a risk of premature fracture according to the premature fracture risk value of the shear pin 404;

[0105] A lowering speed adjustment value generating module generates a lowering speed adjustment value according to the early fracture risk value of the shear pin 404 if the shear pin 404 has a risk of premature fracture; the lowering speed adjustment value refers to the lowering speed required to be adjusted during the process of the packer from the wellhead to the specified depth;

[0106] A lowering speed adjustment module, used to control the lowering speed of the packer by the packer lowering mechanism according to the lowering speed adjustment value;

[0107] Specifically, the fracture risk of shear pin 404 is predicted by the shear pin state analysis module, and the fracture risk of shear pin 404 during the lowering process of the packer is judged by the shear pin premature fracture risk warning module. If there is a risk of premature fracture of shear pin 404, the downward speed of the packer is adjusted, which can effectively prevent the premature sealing of the packer due to the premature fracture of shear pin 404, thereby improving the positioning accuracy of the packer during the sealing process.

[0108] Preferably, the early fracture risk value of the shear pin 404 is obtained in the following manner:

[0109] Establishing a premature fracture risk assessment model of the shear pin 404, obtaining a lowering speed assessment index, a lowering depth assessment index, a smoothness influence index, and a fluid pressure influence index of the packer, substituting the lowering speed assessment index, the lowering depth assessment index, the smoothness influence index, and the fluid pressure influence index into the premature fracture risk assessment model, and generating a premature fracture risk value Q of the shear pin 404;

[0110] Among them, the expression of the premature fracture risk assessment model is:

[0111] ;

[0112] In the expression, S represents the lowering speed evaluation index, N represents the fluid influence index, C represents the temperature influence index, M represents the smoothness influence index, and a1, a2, and a3 are all weight coefficients;

[0113] Among them, the smoothness influence index is obtained as follows:

[0114] Obtaining the minimum radius of the cross section of the well wall 6 where the packer is about to reach, and comparing the minimum radius of the cross section of the well wall 6 where the packer is about to reach with the theoretical radius of the cross section of the well wall 6;

[0115] If the minimum radius of the cross section of the well wall 6 is less than the theoretical radius of the cross section of the well wall 6, it is marked as a depression;

[0116] If the minimum radius of the cross section of the well wall 6 is equal to the theoretical radius of the cross section of the well wall 6, it is marked as a stable position;

[0117] If the minimum radius of the cross section of the well wall 6 is smaller than the theoretical radius of the cross section of the well wall 6, it is marked as a convex part;

[0118] The theoretical radius of the cross section of the well wall 6 refers to the theoretical radius of the cross section of the well wall 6 in a smooth state;

[0119] By formula , the convex width L at the generated convex c ; Raised width L c It refers to the difference between the minimum radius of the cross section of the well wall 6 and the theoretical radius, and the difference is a positive number;

[0120] In the formula, L1 represents the minimum radius of the cross section of the well wall 6, and L0 represents the theoretical radius of the cross section of the well wall 6;

[0121] The convex width L c Perform difference processing with the uplift width threshold to generate a collision difference; the uplift width threshold refers to the maximum width of the outer wall of the packer from the wellbore wall 6;

[0122] The collision difference is processed by ratioing the protrusion width threshold to generate a smoothness influence index of the well wall 6 .

[0123] Preferably, the lowering speed evaluation index is obtained in the following manner:

[0124] Comparing the lowering speed of the packer with a lowering speed threshold, and marking the speed as a non-overspeed speed if the lowering speed is lower than the lowering speed threshold;

[0125] If the lowering speed is higher than the lowering speed threshold, the speed is marked as overspeed; the lowering speed threshold refers to the maximum value of the packer lowering speed safety range, and the packer lowering speed safety range refers to the range of lowering speeds within which the packer can maintain a stable state during the lowering process;

[0126] Perform difference processing on the overspeed speed and the lowered speed threshold to generate an overspeed value;

[0127] The overspeed value is compared with the lowering speed threshold to generate an overspeed factor;

[0128] The difference between the current lowering speed and the most recent historical lowering speed is calculated to generate the real-time speed change value of the packer; the historical lowering speed refers to the historical monitoring data obtained by the speed sensor at the most recent time point;

[0129] Based on Newton's second law, the acceleration force value of the shear pin 404 is generated according to the real-time velocity change value; the acceleration force value refers to the thrust generated by the connecting member 403 on the shear pin 404 due to the velocity change;

[0130] It should be noted that by substituting the velocity change value and the time difference into the acceleration formula, the acceleration of the packer can be derived, and then substituting the acceleration and the mass of the connector 403 into Newton's second law, the acceleration force value can be obtained;

[0131] Calculate the ratio of the acceleration force value to the maximum force value of the shear pin 404 to obtain the acceleration factor;

[0132] The overspeed factor and the acceleration factor are weighted and summed to obtain the lowering speed assessment index.

[0133] Preferably, the temperature impact index is obtained in the following manner:

[0134] Compare the temperature value with the temperature safety range, and if the temperature value is within the temperature safety range, mark the temperature as normal temperature;

[0135] If the temperature value is not within the temperature safety range, the temperature is marked as over-temperature;

[0136] The over-temperature and the nearest endpoint of the temperature safety range are processed by difference to generate a temperature difference value; the nearest endpoint of the temperature safety range refers to the endpoint of the temperature safety range where the over-temperature is closest to the temperature safety range, and the endpoint is the maximum value or minimum value of the temperature safety range;

[0137] The temperature difference value is compared with the nearest end point of the temperature safety range to generate a temperature difference factor;

[0138] According to historical monitoring data, obtain the duration of over-temperature and mark it as over-temperature duration;

[0139] The over-temperature duration is processed with the over-temperature safety duration of the shear pin 404 to generate an over-temperature duration difference; the over-temperature safety duration refers to the maximum duration that the shear pin 404 can withstand the over-temperature without affecting its performance;

[0140] The over-temperature duration difference is processed by ratio processing with the over-temperature safety duration of the shear pin 404 to generate an over-temperature duration factor;

[0141] The temperature difference factor and the over-temperature duration factor are weighted and summed to generate the temperature impact index.

[0142] Preferably, the fluid impact index is obtained in the following manner:

[0143] According to the descending depth of the packer, the depth of the packer in the fluid is obtained;

[0144] Based on the hydrostatic pressure theory, the pressure exerted by the fluid on the packer is generated according to the depth of the packer in the fluid and is marked as fluid pressure;

[0145] Performing difference processing on the fluid pressure and the maximum value of the theoretical pressure range of the shear pin 404 to generate a pressure difference;

[0146] The pressure difference is compared with the maximum value of the theoretical pressure range to generate a pressure factor;

[0147] Obtain the viscosity of the fluid at the location of the packer, and generate the resistance of the fluid to the packer according to the contact area between the connector 403 and the four-petal claw 401 and the fluid and the packer lowering speed;

[0148] Based on mechanical conversion, the resistance is converted into the force of the setting tool 4 acting on the shear pin 404 according to the friction between the setting tool 4 and the casing 1;

[0149] The force is subjected to difference processing with the maximum value of the theoretical bearing force range of the shear pin 404 to generate a force difference; the maximum value of the theoretical bearing force range of the shear pin 404 refers to the maximum force that the shear pin 404 can withstand without breaking;

[0150] The force difference is processed by ratioing the maximum value of the theoretical bearing force range of the shear pin 404 to generate a viscosity factor;

[0151] The pressure factor and the viscosity factor are weighted and summed to generate the fluid influence index.

[0152] Preferably, the early warning mode of the shear pin premature fracture risk warning module is:

[0153] The premature fracture risk value Q is compared with the premature fracture risk threshold. If the premature fracture risk value Q is greater than or equal to the premature fracture risk threshold, it means that the higher the premature fracture risk value Q is, the greater the premature fracture risk of the shear pin 404 is. A judgment result is generated, and the judgment result is that the risk of premature fracture of the shear pin 404 is too high; wherein the premature fracture risk threshold refers to the maximum value of the safe range of the premature fracture risk of the shear pin 404.

[0154] Preferably, the lowering speed adjustment value is obtained in the following manner:

[0155] Establish a lowering speed adjustment analysis model, substitute the current lowering speed and premature fracture risk value Q into the lowering speed generation speed adjustment analysis model, and generate the lowering speed adjustment value Ts;

[0156] Among them, the expression of the lowering speed adjustment analysis model is:

[0157] ;

[0158] Wherein, V represents the current lowering speed of the packer, and Q represents the premature fracture risk value of the shear pin 404 .

[0159] Preferably, the adjustment method of the lowering speed adjustment module specifically includes:

[0160] When the lowering speed adjustment value Ts is received, the lowering speed of the lowering mechanism for the packer is adjusted according to the lowering speed adjustment value Ts, that is, the lowering speed of the casing 1;

[0161] The lowering mechanism lowers the casing 1 through a conveying member arranged on one side of the casing 1, and the lowering speed of the packer can be adjusted by controlling the moving speed of the conveying member;

[0162] The form of the conveying member includes but is not limited to threaded rods, ropes, etc.

[0163] As a preferred embodiment of the present invention, the types of the packer include but are not limited to

[0164] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection device for a large-size packer setting tool, comprising a casing, the casing being sleeved on an oil pipe, a packer assembly being provided on one side of the casing, characterized in that: Also includes: A connecting piece, the connecting piece is arranged on one side of the sleeve and is slidably connected to the sleeve; A shear pin, wherein the shear pin is disposed between the connector and the casing, one end of the shear pin is inserted and connected with the connector, and the other end of the shear pin is inserted and connected with the casing; An extrusion assembly, used for extruding the packing assembly and the shear pin; a detachable connection structure is provided between the extrusion assembly and the packing assembly; The packer lowering monitoring module is used to monitor the status data of the packer and the fluid data of the location of the packer in the well in real time; the status data includes the lowering speed, lowering depth and temperature value, and the fluid data includes the fluid viscosity and fluid pressure; A shear pin state analysis module is used to establish a premature fracture risk assessment model for the shear pin, substitute the state data of the packer and the fluid data of the location of the packer in the well into the premature fracture risk assessment model, and generate a premature fracture risk value for the shear pin; A shear pin premature fracture risk warning module, used to determine whether the shear pin has a risk of premature fracture according to the premature fracture risk value of the shear pin; A lowering speed adjustment value generating module generates a lowering speed adjustment value according to the risk value of early fracture of the shear pin if the shear pin has a risk of early fracture; the lowering speed adjustment value refers to the lowering speed required to be adjusted during the process of the packer from the wellhead to the specified depth; The lowering speed adjustment module is used to control the lowering speed of the packer by the packer lowering mechanism according to the lowering speed adjustment value.

2. A connection device for a large-size packer setting tool according to claim 1, characterized in that: Also includes: A four-petal claw, wherein the four-petal claw is slidably arranged on one side of the sleeve and one end of the four-petal claw is fixedly connected to the connecting member; A lower connector is arranged on one side of the sleeve, and one side of the lower connector is abutted and connected with one end of the four-petal claw.

3. A connection device for a large-size packer setting tool according to claim 1, characterized in that: The extrusion assembly comprises: An extrusion piece, wherein the extrusion piece is slidably disposed on one side of the sleeve; The clamping piece is fixedly arranged on one side of the extrusion piece.

4. A connection device for a large-size packer setting tool according to claim 3, characterized in that: The packing assembly comprises: A sealing rubber cylinder, wherein the sealing rubber cylinder is arranged on one side of the connecting piece; A locking ring, the locking ring being arranged on one side of the sealing rubber cylinder; A connecting groove, wherein the connecting groove is provided on the locking ring, and the locking ring is inserted and slidably connected with the clamping member through the connecting groove; A magnetic attraction member is fixedly disposed in the connecting groove.

5. The connection device for a large-size packer setting tool according to claim 1, characterized in that: The method for obtaining the premature fracture risk value of the shear pin is as follows: Establishing a premature fracture risk assessment model for the shear pin, obtaining a lowering speed assessment index, a lowering depth assessment index, a smoothness influence index, and a fluid pressure influence index of the packer, substituting the lowering speed assessment index, the lowering depth assessment index, the smoothness influence index, and the fluid pressure influence index into the premature fracture risk assessment model, and generating a premature fracture risk value Q of the shear pin; Among them, the expression of the premature fracture risk assessment model is: ； In the expression, S represents the lowering speed evaluation index, N represents the fluid influence index, C represents the temperature influence index, M represents the smoothness influence index, and a1, a2, and a3 are all weight coefficients; Among them, the smoothness influence index is obtained as follows: Obtaining the minimum radius of the wellbore cross section where the packer is about to reach, and comparing the minimum radius of the wellbore cross section where the packer is about to reach with the theoretical radius of the wellbore cross section; If the minimum radius of the well wall cross section is smaller than the theoretical radius of the well wall cross section, it is marked as a convexity; wherein the theoretical radius of the well wall cross section refers to the theoretical radius of the well wall cross section in a smooth state; By formula , the convex width L at the generated convex c ; Protrusion width L c It refers to the difference between the minimum radius of the wellbore cross section and the theoretical radius, and the difference is a positive number; In the formula, L1 represents the minimum radius of the wellbore cross section, and L0 represents the theoretical radius of the wellbore cross section; The convex width L c Perform difference processing with the uplift width threshold to generate a collision difference; the uplift width threshold refers to the maximum width between the outer wall of the packer and the well wall; The collision difference is compared with the bulge width threshold to generate the wellbore smoothness impact index.

6. A connection device for a large-size packer setting tool according to claim 5, characterized in that: The method for obtaining the lowering speed evaluation index is as follows: Compare the packer lowering speed with the lowering speed threshold. If the lowering speed is higher than the lowering speed threshold, the speed is marked as an overspeed. The lowering speed threshold refers to the maximum value of the packer lowering speed safety range. The packer lowering speed safety range refers to the range of lowering speeds within which the packer can maintain a stable state during the lowering process. Perform difference processing on the overspeed speed and the lowered speed threshold to generate an overspeed value; The overspeed value is compared with the lowering speed threshold to generate an overspeed factor; The difference between the current lowering speed and the most recent historical lowering speed is calculated to generate the real-time speed change value of the packer; the historical lowering speed refers to the historical monitoring data obtained by the speed sensor at the most recent time point; Based on Newton's second law, the acceleration force value of the shear pin is generated according to the real-time velocity change value; the acceleration force value refers to the thrust generated by the connecting member on the shear pin due to the velocity change; Calculate the ratio of the acceleration force value to the maximum force value of the shear pin to obtain the acceleration factor; The overspeed factor and the acceleration factor are weighted and summed to obtain the lowering speed assessment index.

7. A connection device for a large-size packer setting tool according to claim 5, characterized in that: The temperature impact index is obtained as follows: Compare the temperature value with the temperature safety range, and if the temperature value is not within the temperature safety range, mark the temperature as an over-temperature; Perform difference processing between the over-temperature and the nearest endpoint of the temperature safety range to generate a temperature difference value; The temperature difference value is compared with the nearest end point of the temperature safety range to generate a temperature difference factor; According to the historical monitoring data, the duration of over-temperature is obtained and marked as over-temperature duration; Performing difference processing on the over-temperature duration and the over-temperature safety duration of the shear pin to generate an over-temperature duration difference; The over-temperature duration difference is processed by ratio with the over-temperature safety duration of the shear pin to generate an over-temperature duration factor; The temperature difference factor and the over-temperature duration factor are weighted and summed to generate the temperature impact index.

8. A connection device for a large-size packer setting tool according to claim 2, characterized in that: The fluid influence index is obtained as follows: According to the descending depth of the packer, the depth of the packer in the fluid is obtained; Based on the hydrostatic pressure theory, the pressure exerted by the fluid on the packer is generated according to the depth of the packer in the fluid and is marked as fluid pressure; Performing differential processing on the fluid pressure and the maximum value of the theoretical pressure range of the shear pin to generate a pressure difference; The pressure difference is compared with the maximum value of the theoretical pressure range to generate a pressure factor; Obtaining the viscosity of the fluid at the location of the packer, and generating the resistance of the fluid to the packer according to the contact area between the connector and the four-petal claw and the fluid and the packer lowering speed; Based on mechanical conversion, the resistance is converted into the force exerted by the connecting member on the shear pin according to the friction between the connecting member and the casing; Performing difference processing on the applied force and the maximum value of the theoretical bearing capacity range of the shear pin to generate an applied force difference; The force difference is processed by ratioing the maximum value of the theoretical bearing force range of the shear pin to generate a viscosity factor; The pressure factor and the viscosity factor are weighted and summed to generate the fluid influence index.

9. A connection device for a large-size packer setting tool according to claim 5, characterized in that: The early warning method of the shear pin early fracture risk early warning module is: The premature fracture risk value Q is compared with the premature fracture risk threshold. If the premature fracture risk value Q is greater than or equal to the premature fracture risk threshold, it means that the higher the premature fracture risk value Q is, the greater the risk of premature fracture of the shear pin is. A judgment result is generated, and the judgment result is that the risk of premature fracture of the shear pin is too high. Among them, the premature fracture risk threshold refers to the maximum value of the safety range of the premature fracture risk of the shear pin.

10. A connection device for a large-size packer setting tool according to claim 1, characterized in that: The method for obtaining the lowering speed adjustment value is as follows: Establish a lowering speed adjustment analysis model, substitute the current lowering speed and premature fracture risk value Q into the lowering speed generation speed adjustment analysis model, and generate the lowering speed adjustment value Ts; Among them, the expression of the lowering speed adjustment analysis model is: ； Among them, V represents the current lowering speed of the packer, and Q represents the risk value of premature fracture of the shear pin.

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