While-drilling bridge plug for oil exploitation

Abstract

The utility model discloses a while-drilling bridge plug for oil exploitation. The while-drilling bridge plug comprises a drill rod connecting mechanism, a pushing mechanism, a sliding mechanism and an anchoring mechanism. By arranging the well fluid flow channel and the ingenious drill rod connecting mechanism, the bridge plug can keep normal flowing of well fluid in the drilling operation process, meanwhile, the bridge plug is fused with a drill rod, and it is ensured that plugging operation is prepared at any time. Under emergency conditions, the drill rod does not need to be taken out, the slip can be pushed to expand and anchor through the pushing mechanism only by putting the ball and injecting liquid, rapid plugging is achieved, the time for taking out the drill rod and lowering the bridge plug is saved, and the efficiency for dealing with emergency conditions such as blowout is improved. Meanwhile, the device can be used in cooperation with a ground blowout preventer, a double-plugging structure is formed, and the safety and reliability of plugging operation are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil exploitation, in particular to a drilling-while-drilling bridge plug used for oil exploitation. Background Art

[0002] The plugging tool plays a vital role in oilfield exploitation. It can effectively control the pressure and fluid in the wellbore, protect the wellbore and equipment, and ensure the smooth progress of oil and gas production. The function of the bridge plug is to seal the oil and gas well. It has the characteristics of fewer construction processes, short cycle, and accurate sealing position.

[0003] The utility model patent with patent number CN202560158U discloses a drillable composite bridge plug, such as Figure 1 As shown, it includes: a columnar central body 2 made of non-metallic composite material, on the outer wall of which an upper limit body, a retaining ring 32, a stop mechanism 33, an upper cava 341, an upper cone 351, an rising ring 361, a rubber cylinder 37, a lower rising ring 362, a lower cone 352, a lower cava 342 and a lower limit body are sequentially sleeved, wherein the upper limit body is an upper outer sleeve 311, and the lower limit body is a lower outer sleeve 312, and the upper and lower outer sleeves 311, 312 are respectively screwed to the central body 2, and a solid portion 21 for resisting the sealing tool 500 and a hollow portion 22 located below the solid portion 21 are formed inside the central body 2, and the hollow portion 22 forms a columnar cavity of the central body 2.

[0004] When plugging an oil well, the drillable composite bridge plug is first connected to the bottom of a sealing tool 500, and then the top of the sealing tool 500 is connected to the bottom of an oil pipe 600, which can be a continuous oil pipe; then the oil pipe 600 is used to pump the bridge plug 100 and the sealing tool 500 with a small displacement. When the tool group is lowered to a predetermined position of the horizontal well (such as between two fractured layers 800), a ball is dropped from the ground. After the ball falls on a ball seat of the sealing tool 500, hydraulic pressure is applied to the oil pipe 600. The pressure causes the sealing tool 500 to cut off the shear nails of its outer jacket and make its outer jacket push downward against the retaining ring 32 of the bridge plug of the utility model. The retaining ring 32 is forced to cut off the shear nails 321 downward. The lock ring 331 is displaced downward by the thrust, pushing the shield 332 and driving the upper slip 341 to expand and push the upper cone 351 downward; at the same time, due to the limiting and resisting effect of the lower outer sleeve 312, the upper and lower cones 351, 352 are squeezed by the upper and lower slips 341, 342 to cut off the shear nails 353, 354 respectively. At this time, the upper and lower cones 351, 352 are squeezed and deformed due to their openings. With continued squeezing, the upper and lower expansion rings 361, 362 and the rubber sleeve 37 will expand to seal the casing annulus, and the hard teeth on the outer walls of the upper and lower slips 341, 342 bite tightly on the casing to anchor the bridge plug 100, thereby achieving the effect of sealing.

[0005] The invention patent application with the patent publication number CN117449802A discloses a single slip bridge plug for electric setting, which includes: a head nut, a pin A, a lower sleeve, a pin B, a slip, a cone, a load ring, a sealing ring, a tension mandrel, a setting sleeve, an adapter, a setting tool assembly, a working string, a connecting pipe, a guide block, a coupling, a driving screw, a motor, a motor seat, a motor fixing bolt, and a motor seat top screw. Figure 2 As shown, the machine head nut 1 is connected to the tension mandrel 9 through a thread, and the connection between the machine head nut 1 and the tension mandrel 9 is further fixed by a pin A2; the lower sleeve 3 is located between the machine head nut 1 and the slip 5, and is connected to the slip 5 through a pin B4; the slip 5 is provided with a guide groove 51, a pin window hole 52 and a slip tooth 53; the cone 6 is connected in series to the tension mandrel 9 through an internal channel, and the upper cone surface 61 and the lower cone surface 62 of the cone 6 are in contact with the inner wall surface of the slip 5 and the bearing ring 7 respectively; the sealing ring 8 is placed in the groove of the bearing ring 7; the tension mandrel 9 is connected to the setting tool assembly 12 through a thread, and the tension mandrel 9 is provided with a flow channel hole A9 around it. 1. Flow channel hole B92; flow channel hole A91 and flow channel hole B92 are connected; the setting sleeve 10 is connected to the adapter 11 through a thread, and the setting sleeve is provided with a flow channel hole C101; the adapter 11 is connected to the working pipe string 13 through a thread; the upper end of the connecting pipe 14 is connected to the setting tool assembly 12 through a thread, and the lower end is connected to the guide block 15 through a thread, and the guide block 15 is connected in series to the driving screw 16, and the driving screw 16 is connected to the rotating shaft of the motor 18 through the coupling 17, and the guide block 15 realizes the up and down movement on the driving screw 16 through the forward and reverse rotation of the motor 18, and the motor seat 19 is connected to the working pipe string 13 through the motor seat top screw 21.

[0006] When sealing an oil well, first, the tool is transported to a preset position through the downhole pipeline, and the starting motor 18 drives the driving screw 16 to rotate through the coupling 17, and the guide block 15 moves downward, and at the same time drives the tension mandrel 9 to move downward, pushing the lower sleeve 3 to drive the slip 5 to slide downward along the upper conical surface 61 of the cone 6, so as to realize the radial expansion of the slip 5. During the downward movement of the tension mandrel 9, the sealing sleeve 10 remains stationary, and the cone 6 loses its longitudinal constraint and will be squeezed by the slip 5 to move downward, stretching the load ring 7, and the sealing ring 8 expands and contacts with the sleeve 100 to achieve sealing. The machine head nut 1 continues to apply tension to the lower sleeve 3 downward until the lower sleeve 3 is sheared and the connection is disconnected, and the tool is pulled out through the downhole pipeline to achieve release, completing the downhole operation.

[0007] The above two bridge plugs have different structural compositions and working principles, but they have one thing in common with other existing bridge plugs, that is, when oil well plugging is required, the drill pipe must be removed first and then the bridge plug must be lowered, which takes a long time and cannot effectively deal with blowouts that may occur in emergency situations.

[0008] It can be seen that the existing technology still needs to be improved and perfected. Utility Model Content

[0009] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a drilling bridge plug for oil production, so as to improve the existing bridge plugs, which require the drill pipe to be removed first and then the bridge plug to be lowered when oil well sealing is required, which takes a long time and cannot effectively deal with the problem of blowouts that may occur in emergency situations.

[0010] The technical solution of this utility model is as follows:

[0011] A drilling-while-drilling bridge plug for oil production, the drilling-while-drilling bridge plug is used to be arranged between two sections of drill pipe, and a well fluid flow channel penetrating the entire bridge plug is arranged in the middle to ensure that the well fluid can flow normally during drilling work;

[0012] The drilling bridge plug comprises the following components:

[0013] Drill pipe connection mechanism: including an upper joint and a lower joint, which are used to connect the upper drill pipe and the lower drill pipe respectively;

[0014] Pushing mechanism: arranged between the upper joint and the lower joint, used to push the anchoring mechanism to expand outward when the oil well needs to be plugged;

[0015] Sliding mechanism: located inside the pushing mechanism, used to close the hydraulic port on the pushing mechanism during normal drilling operation, and moved downward to expose the hydraulic port when the oil well needs to be plugged, so that the liquid can flow through the hydraulic port to the specified position to generate hydraulic power;

[0016] Anchoring mechanism: comprising slips, which are used to expand outwards under the action of the pushing mechanism to ensure that the drilling bridge plug can be firmly anchored in the casing.

[0017] The effect of the above scheme is that the drilling bridge plug provided by the utility model ensures the normal flow of well fluid during the drilling process through the well fluid flow channel opened, and the drill pipe connecting mechanism makes the entire bridge plug cleverly integrated into the drill pipe, so that the drilling bridge plug is always kept in the oil well during the drilling process; once an emergency occurs and the oil well needs to be closed, the drilling bridge plug does not need to take out the drill pipe and then perform the well sealing operation, but is directly put into a spherical ball, and then liquid is injected, pressure is applied, and the sliding mechanism is pushed to a specified position to expose the hydraulic port, so that the liquid prompts the pushing mechanism to push the slip to expand outward to be firmly anchored in the casing; the whole process saves the time of taking out the drill pipe and lowering the bridge plug, and can also be used together with the ground blowout preventer to form a double plugging structure, which improves the existing bridge plug when it is necessary to plug the oil well, and the drill pipe needs to be taken out first and then the bridge plug is lowered, which takes a long time and cannot effectively deal with the problem of blowout that may occur in an emergency.

[0018] In a further preferred embodiment, the pushing mechanism includes a core shaft, the hydraulic port is opened on the core shaft, and the sliding mechanism is connected to the core shaft.

[0019] The effect of the above scheme is that the mandrel, as the core component of the pushing mechanism, has good rigidity and stability, can effectively transmit the external force, and the hydraulic port on it can accurately control the flow of liquid and realize precise control of the sliding mechanism. In addition, the sliding mechanism is connected to the mandrel and can be closely combined with the hydraulic port to ensure reliable blocking of the hydraulic port during normal drilling operation.

[0020] In a further preferred embodiment, the pushing mechanism includes: a movable piston and a piston cylinder, both of which are sleeved on the outer edge of the core shaft, and a hydraulic cavity is reserved between the movable piston and the piston cylinder, and the movable piston is used to move toward the anchoring mechanism after the liquid flows into the hydraulic cavity through the hydraulic port, so as to push the cava to expand outward.

[0021] The effect of the above scheme is that the above setting is based on the reasonable application of hydraulic principles and mechanical movement, and through the control of liquid flow and pressure, the plugging operation is efficient, stable and reliable. Specifically, when the liquid flows into the hydraulic cavity through the hydraulic port, a certain pressure will be generated, and the mobile piston will move toward the anchoring mechanism under the action of the pressure, thereby pushing the slip to expand outward. In addition, the reserved hydraulic cavity of the mobile piston and the piston cylinder can provide sufficient hydraulic power to ensure that the slip can expand outward stably and be effectively anchored in the casing.

[0022] In a further preferred embodiment, the pushing mechanism further comprises a moving rod, which is arranged between the moving piston and the pushing mechanism and is used to push the slips to expand outward; the moving rod is a threaded rod, and a threaded hole matching the moving rod is provided on the piston cylinder.

[0023] The effect of the above scheme is that the introduction of the moving rod is mainly to enhance the force and stability of the slip expansion outward, so as to more effectively realize the anchoring effect of the drilling bridge plug. First of all, as a mechanical transmission device, the moving rod can transmit the driving force to the slip through the rotation of the threaded rod, thereby pushing the slip to expand outward. The theoretical basis is that the rotation of the threaded rod will produce linear displacement, so that the moving rod moves in the direction of the pushing mechanism to achieve the effect of pushing the slip. Secondly, the piston cylinder is provided with a threaded hole that is compatible with the moving rod, which can form a good connection between the moving rod and the piston cylinder, ensuring that the driving force can be effectively transmitted, and at the same time, the working state of the pushing mechanism can be adjusted to meet the needs of different plugging conditions. Therefore, by introducing the moving rod and adopting the threaded transmission method, the driving force and stability of the pushing mechanism are enhanced, so that the drilling bridge plug can more efficiently and reliably achieve the anchoring and plugging of the oil well in the plugging operation.

[0024] In a further preferred embodiment, the pushing mechanism further includes an upper piston, which is disposed between the moving rod and the pushing mechanism and is used to push the slips to expand outward.

[0025] The effect of the above scheme is that when the upper piston is subjected to external pressure, it will exert a force equal to and opposite to the pressure downward, and this force will be transmitted to the cava through the moving rod, so that the cava will expand outward. By setting the upper piston, the pushing force of the pushing mechanism can be effectively enhanced, and the stability and anchoring effect of the cava can be improved. In addition, the setting of the upper piston can also better control the expansion process of the cava, ensuring that its expansion speed and strength are just right to meet the needs under different plugging conditions. Therefore, by introducing the upper piston, the pushing force and stability of the pushing mechanism are further enhanced, so that the drilling bridge plug can more efficiently and reliably achieve the anchoring and plugging of the oil well during the plugging operation.

[0026] In a further preferred embodiment, the anchoring mechanism further comprises: a lower support sleeve, the lower support sleeve is connected to the upper piston, and the end of the lower support sleeve facing the slip is inclined and fits with the first inclined surface of the slip.

[0027] The effect of the above scheme is that the setting of the lower support sleeve provides additional support for the anchoring mechanism, especially after the slip expands, the lower support sleeve can effectively withstand the pressure below, and form a stable support structure by fitting with the inclined surface of the slip, thereby ensuring that the drilling bridge plug can be firmly anchored in the casing. Its theoretical basis is that the inclined surface design of the lower support sleeve can perfectly fit with the first inclined surface of the slip to form a close contact, increase the contact area of ​​the anchoring structure, and improve the stability and reliability of the anchoring. Through this setting, the slip can be effectively prevented from sliding or becoming unstable under pressure, thereby ensuring the smooth progress of the oil well plugging operation.

[0028] In a further preferred embodiment, the anchoring mechanism also includes: an upper support sleeve, which is sleeved on the outer edge of the core shaft, arranged on the side of the cava away from the lower support sleeve, with an inclined surface facing the cava, fitting with the second inclined surface of the cava, and opposite to the inclination angle of the inclined surface of the lower support sleeve, so as to prevent the cava from moving horizontally.

[0029] The effect of the above scheme is that the design of the upper support sleeve is symmetrical with the lower support sleeve, and the end facing the slip is inclined, and fits with the second inclined surface of the slip, and the inclination angle is opposite to that of the lower support sleeve. Such a design provides another important anchoring support point, further enhancing the stability and reliability of the drilling bridge plug. The fitting design of the upper support sleeve and the slip can effectively increase the contact area of ​​the anchoring structure and improve the stability of the anchoring. When the slip expands outward, the inclined surface of the upper support sleeve will provide additional support to prevent the slip from being unstable or sliding. At the same time, the design of the upper support sleeve is opposite to the inclination angle of the inclined surface of the lower support sleeve, so that a symmetrical force distribution can be formed when pressure is applied, further enhancing the firmness of the anchoring. Therefore, by introducing the upper support sleeve, an additional support point is provided, the stability and reliability of the anchoring mechanism are enhanced, thereby further improving the effect and safety of the drilling bridge plug in the oil well plugging operation.

[0030] In a further preferred embodiment, the anchoring mechanism further comprises: a skeleton rubber sleeve, which is fitted with the upper support sleeve and is located on a side of the upper support sleeve away from the slip, and is used to provide support for the expansion of the slip.

[0031] The effect of the above scheme is that the main function of the skeleton rubber cartridge is to provide additional support and stability for the expansion of the slip. Through the fitting design with the upper support sleeve, the skeleton rubber cartridge can effectively increase the support area of ​​the anchoring mechanism, and improve the stability and firmness of the slip when it expands. The fitting design of the skeleton rubber cartridge and the upper support sleeve can form a uniform support surface. When the slip expands, the skeleton rubber cartridge will be under pressure, thereby applying a supporting force outward to prevent the slip from being unstable or sliding, further improving the effect and safety of the drilling bridge plug in the oil well plugging operation.

[0032] In a further preferred embodiment, the sliding mechanism comprises: an upper sliding sleeve and a lower sliding sleeve, wherein the upper sliding sleeve and the lower sliding sleeve are connected to the core shaft through a first shear pin and a second shear pin respectively, and the lower sliding sleeve is used to block the hydraulic port during normal drilling operation.

[0033] The effect of the above scheme is that when normal drilling operations are carried out, the lower sliding sleeve will block the hydraulic port to prevent liquid from accidentally entering the sliding mechanism. The technical effects of this design are reflected in the following aspects: First, through the layered design of the upper sliding sleeve and the lower sliding sleeve, a more accurate hydraulic port blocking is achieved, effectively preventing liquid leakage and accidental entry. Secondly, the connection design of the first shear pin and the second shear pin provides a reliable mechanism to ensure the stability and reliability of the sliding mechanism. Finally, this design can be flexibly applied in drilling operations, so that the sliding mechanism can block the hydraulic port at any time as needed, providing a more convenient and efficient solution for oil well blocking. Therefore, through a carefully designed sliding mechanism, reliable blocking of the hydraulic port is achieved, the operability and safety of the drilling bridge plug are improved, and a more reliable guarantee is provided for oil well operations.

[0034] In a further preferred embodiment, an opening groove is provided at the lower end of the upper joint, the opening groove is connected to a locking groove, and a locking protrusion is provided on the outer edge of the core shaft. Under normal operating conditions, the locking protrusion is accommodated in the locking groove. When it is necessary to release the hand, the locking protrusion escapes through the opening groove to separate the upper joint from the core shaft.

[0035] The effects of the above scheme are: first, through the design of the opening groove and the locking groove, a reliable connection and unlocking mechanism is realized, so that the connection between the upper joint and the core shaft can be carried out at any time, and can be quickly separated when necessary, which improves the flexibility and convenience of operation. Secondly, the setting of the locking protrusion ensures that under normal operating conditions, the connection between the upper joint and the core shaft is firm and reliable, and there will be no accidental falling off or loosening, ensuring the safety and stability of the operation. Finally, the design of the opening groove makes the hand-off operation easier and faster, saving time and labor costs and improving work efficiency; and when it is necessary to break the blockage and drill normally again, the design of the opening groove and the locking groove can make the upper joint and the core shaft reconnectable.

[0036] Compared with the prior art, the drilling-while-drilling bridge plug for oil production provided by the utility model includes: a drill pipe connection mechanism, a pushing mechanism, a sliding mechanism and an anchoring mechanism; by setting a well fluid flow channel and an ingenious drill pipe connection mechanism, the bridge plug can maintain the normal flow of well fluid during the drilling operation, and at the same time integrate with the drill pipe to ensure that the plugging operation is ready at any time. In an emergency, there is no need to remove the drill pipe, only to insert a ball and inject liquid, and the push mechanism can be used to push the slip to expand and anchor, so as to achieve rapid plugging, saving the time of removing the drill pipe and lowering the bridge plug, and improving the efficiency of dealing with emergency situations such as blowouts. At the same time, it can be used in conjunction with a ground blowout preventer to form a double plugging structure, which further improves the safety and reliability of the plugging operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a half-section view of the drillable composite bridge plug disclosed in CN202560158U.

[0038] Figure 2 It is a cross-sectional view of the electrically sealed single slip bridge plug disclosed in CN117449802A.

[0039] Figure 3 It is a schematic diagram of the structural composition of a drilling-while-drilling bridge plug used for oil production in a preferred embodiment of the utility model.

[0040] Figure 4 The utility model is a schematic diagram of the components of a drilling-while-drilling bridge plug used for oil production in a preferred embodiment of the utility model.

[0041] Figure 5 It is a cross-sectional view of a drilling-while-drilling bridge plug used for oil production in a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0042] The utility model provides a drilling-while-drilling bridge plug for oil production. To make the purpose, technical solution and effect of the utility model clearer and more specific, the following specific implementation manner will further describe the utility model in detail with reference to the accompanying drawings and examples.

[0043] The utility model provides a drilling-while-drilling bridge plug for oil production, such as Figure 3 As shown in FIG. 1 , it includes: a drill pipe connection mechanism 100, a pushing mechanism 300, a sliding mechanism 200 and an anchoring mechanism 400. A well fluid flow channel 311 is provided in the middle portion to pass through the entire bridge plug to ensure that the well fluid can flow normally during drilling. The drill pipe connection mechanism 100 includes an upper joint 110 and a lower joint 120, as shown in FIG. Figure 4 , 5 As shown, they are used to connect the upper drill pipe and the lower drill pipe respectively. The pushing mechanism 300 is arranged between the upper joint 110 and the lower joint 120, and is used to push the anchoring mechanism 400 to expand outward when the oil well needs to be plugged. The sliding mechanism 200 is located inside the pushing mechanism 300, and is used to close the hydraulic port on the pushing mechanism 300 during normal drilling operations, and move downward to expose the hydraulic port when the oil well needs to be plugged, so that the liquid can flow to the specified position through the hydraulic port to generate hydraulic power. The anchoring mechanism 400 includes a slip 410, as shown in FIG. Figure 4 , 5 As shown, the slips 410 are used to expand outwards under the action of the pushing mechanism 300 to ensure that the while drilling bridge plug can be firmly anchored in the casing.

[0044] When sealing the well, first put in a ball (preferably a steel ball, Figure 3 , 4The liquid is injected into the ball to apply pressure to the ball, so that the ball pushes the sliding mechanism 200 downward to expose the hydraulic port. The liquid enters the pushing mechanism 300 through the hydraulic port, generating hydraulic power to push the slips 410 to expand outward. The pushing mechanism 300 acts on the hydraulic chamber (such as Figure 4 As shown in the figure, the liquid pressure is converted into a driving force to push the slips 410 of the anchoring mechanism 400 to expand outward. Under the action of the driving force, the slips 410 are in close contact with the inner wall of the casing to achieve a firm anchoring and complete the well sealing operation.

[0045] The drilling bridge plug of the utility model ensures the normal flow of well fluid during drilling through the design of the well fluid flow channel 311. The drill pipe connection mechanism 100 is cleverly integrated into the drill pipe, so that the bridge plug is always kept in the oil well during drilling. When it is necessary to seal the well, there is no need to remove the drill pipe. The ball is directly put in and liquid is injected to apply pressure. The sliding mechanism 200 moves to expose the hydraulic port. The pushing mechanism 300 acts on the anchoring mechanism 400 to expand the slip 410 to anchor the casing, quickly and effectively sealing the oil well. The whole process is time-saving and efficient. It can be used in conjunction with the ground blowout preventer to form a double sealing structure, which effectively solves the problem of long well sealing operation time and inability to quickly respond to emergency blowouts in the prior art.

[0046] In a further preferred embodiment of the present invention, the sliding mechanism 200 includes an upper sliding sleeve 210 and a lower sliding sleeve 220. Figure 4 As shown, the upper sliding sleeve 210 and the lower sliding sleeve 220 are connected to the core shaft 310 through a first shear nail and a second shear nail respectively, and the lower sliding sleeve 220 is used to block the hydraulic port during normal drilling operation.

[0047] During normal drilling operations, the lower sliding sleeve 220 blocks the hydraulic port to prevent liquid from accidentally entering the sliding mechanism 200. When the oil well needs to be plugged, the shear pins of the sliding mechanism 200 are sheared by injecting liquid and applying pressure, so that the lower sliding sleeve 220 moves downward to expose the hydraulic port. The liquid enters the pushing mechanism 300 through the hydraulic port, generating hydraulic power, pushing the slips 410 of the anchoring mechanism 400 to expand outward and firmly anchor in the casing, thereby completing the well plugging operation.

[0048] First, through the layered design of the upper sliding sleeve 210 and the lower sliding sleeve 220, a more accurate hydraulic port plugging is achieved, effectively preventing liquid leakage and accidental entry. Secondly, the connection design of the first shear pin and the second shear pin provides a reliable mechanism to ensure the stability and reliability of the sliding mechanism 200. Finally, this design can be flexibly applied in drilling operations, so that the sliding mechanism 200 can plug the hydraulic port at any time as needed, providing a more convenient and efficient solution for oil well plugging. Through the carefully designed sliding mechanism 200, reliable plugging of the hydraulic port is achieved, the operability and safety of the drilling bridge plug are improved, and a more reliable guarantee is provided for oil well operations.

[0049] Preferably, the lower end of the upper joint 110 is provided with an opening slot 111. Figure 4 As shown, the opening groove 111 is connected to a locking groove, and a locking protrusion is provided on the outer edge of the core shaft 310. In a normal working state, the locking protrusion is accommodated in the locking groove. When it is necessary to release the hand, the locking protrusion is disengaged through the opening groove 111, so that the upper joint 110 is separated from the core shaft 310.

[0050] During oil well operations, the design of the opening groove 111 and the locking groove forms a stable connection between the upper joint 110 and the mandrel 310. During the first installation, the locking protrusion enters the opening groove 111 and reaches a position flush with the locking groove, and then the upper joint 110 or the mandrel 310 is rotated to make the locking protrusion enter the locking groove to complete the assembly of the upper joint 110 and the mandrel 310; during normal drilling operations, the locking protrusion is accommodated in the locking groove to ensure that the connection between the upper joint 110 and the mandrel 310 is firm and reliable and will not fall off accidentally. When it is necessary to release the hand, the design of the opening groove 111 can quickly make the locking protrusion disengage, separate the upper joint 110 and the mandrel 310, and complete the release operation; when the oil well needs to be activated again, repeat the action of the first installation to complete the connection between the upper joint 110 and the mandrel 310 again.

[0051] First, through the design of the opening groove 111 and the locking groove, a reliable connection and unlocking mechanism is realized, so that the connection between the upper joint 110 and the core shaft 310 can be carried out at any time, and can be quickly separated when necessary, which improves the flexibility and convenience of operation. Secondly, the setting of the locking protrusion ensures that under normal operating conditions, the connection between the upper joint 110 and the core shaft 310 is firm and reliable, and there will be no accidental falling off or loosening, ensuring the safety and stability of the operation. Finally, the design of the opening groove 111 makes the hand-off operation easier and faster, saving time and labor costs, and improving work efficiency; and when it is necessary to break the blockage and drill normally again, the design of the opening groove 111 and the locking groove can make the upper joint 110 and the core shaft 310 can be connected again, thereby ensuring the reuse of downhole tools and improving the economy and efficiency of the overall operation.

[0052] Preferably, the pushing mechanism 300 includes a core shaft 310, such as Figure 4 and Figure 5 As shown, the hydraulic port is opened on the core shaft 310 , and the sliding mechanism 200 is connected to the core shaft 310 .

[0053] When operating an oil well, the mandrel 310, as the core component of the pushing mechanism 300, can withstand and transmit the external force. The hydraulic port is set on the mandrel 310, which can accurately control the flow of liquid. When the oil well needs to be plugged, the liquid enters the sliding mechanism 200 through the hydraulic port, and the sliding mechanism 200 moves under the action of the hydraulic pressure, thereby realizing the control of the downhole equipment.

[0054] As the core component of the pushing mechanism 300, the mandrel 310 has good rigidity and stability, can effectively transmit the externally applied force, and the hydraulic port on it can accurately control the flow of liquid, thereby realizing precise control of the sliding mechanism 200. In addition, the sliding mechanism 200 is connected to the mandrel 310 and can be closely combined with the hydraulic port to ensure reliable blocking of the hydraulic port during normal drilling operations, thereby ensuring the stability and reliability of the entire system. This design improves the efficiency and safety of oil well operations and ensures the effective operation of the drilling bridge plug under various working conditions.

[0055] Furthermore, the pushing mechanism 300 includes: a moving piston 320 and a piston cylinder 330, such as Figure 4 As shown, the movable piston 320 and the piston cylinder 330 are both sleeved on the outer edge of the core shaft 310, and a hydraulic cavity is reserved between the movable piston 320 and the piston cylinder 330. The movable piston 320 is used to move toward the anchoring mechanism 400 after the liquid flows into the hydraulic cavity through the hydraulic port, so as to push the slips 410 to expand outward.

[0056] During the oil well operation, when the oil well needs to be plugged, the liquid enters the hydraulic cavity through the hydraulic port, generating a certain amount of hydraulic pressure. At this time, the movable piston 320 moves along the core shaft 310 toward the anchoring mechanism 400 under the action of the hydraulic pressure, thereby pushing the slips 410 to expand outward, so that they are firmly anchored in the casing. The design of the movable piston 320 and the piston cylinder 330 can effectively utilize the hydraulic pressure to achieve precise control of the slips 410.

[0057] This design is based on the rational application of hydraulic principles and mechanical movement, and achieves efficient, stable and reliable plugging operations through precise control of liquid flow and pressure. The pressure generated when the liquid flows into the hydraulic cavity through the hydraulic port causes the mobile piston 320 to move toward the anchoring mechanism 400, pushing the slips 410 to expand outward. The hydraulic cavity reserved between the mobile piston 320 and the piston cylinder 330 provides sufficient hydraulic power to ensure the stable expansion of the slips 410, thereby effectively anchoring them in the casing, improving the efficiency and safety of oil well operations.

[0058] Preferably, the pushing mechanism 300 further includes a moving rod 340, such as Figure 4 As shown, it is disposed between the moving piston 320 and the pushing mechanism 300 and is used to push the slips 410 to expand outward. The moving rod 340 is a threaded rod, and a threaded hole matching the moving rod 340 is provided on the piston cylinder 330.

[0059] During operation, when the oil well needs to be plugged, liquid enters the hydraulic cavity through the hydraulic port, pushing the moving piston 320 to move. At this time, the moving rod 340 transmits the driving force to the slips 410 through the rotation of the threaded rod, thereby pushing the slips 410 to expand outward and firmly anchored in the casing. The matching design of the threaded hole and the moving rod 340 ensures the effective transmission of the driving force and the stable operation of the driving mechanism 300.

[0060] The introduction of the moving rod 340 enhances the force and stability of the outward expansion of the slip 410, and improves the anchoring effect of the while-drilling bridge plug. The rotational movement of the threaded rod generates a linear displacement, which transmits the driving force to the piston cylinder 330 and the moving piston 320, thereby pushing the slip 410 to expand outward. The adaptive design of the threaded hole and the moving rod 340 ensures the effective transmission of the driving force, and allows the working state of the driving mechanism 300 to be adjusted to meet the needs of different plugging conditions. Therefore, the combination of the moving rod 340 and the threaded transmission method enhances the driving force and stability of the driving mechanism 300, so that the while-drilling bridge plug can more efficiently and reliably achieve the anchoring and plugging of the oil well in the plugging operation.

[0061] Preferably, in a further preferred embodiment, the pushing mechanism 300 further includes an upper piston 350, such as Figure 4As shown, it is arranged between the moving rod 340 and the pushing mechanism 300, and is used to push the slips 410 to expand outward.

[0062] During operation, when liquid enters the hydraulic cavity through the hydraulic port, the upper piston 350 is subjected to the hydraulic pressure and exerts a force equal to and opposite to the pressure downward. This force is transmitted to the mobile piston 320 through the mobile rod 340, and then transmitted to the upper piston 350 by the mobile piston 320, and then transmitted to the slip 410 by the upper piston 350, thereby pushing the slip 410 to expand outward and firmly anchor it in the casing. The design of the upper piston 350 makes the transmission of force more direct and effective, and enhances the overall performance of the driving mechanism 300.

[0063] The setting of the upper piston 350 can effectively enhance the driving force of the driving mechanism 300 and improve the stability and anchoring effect of the slip 410. Through the pressure transmitted by the upper piston 350, the slip 410 can expand outward more stably to achieve firm anchoring. At the same time, the design of the upper piston 350 can also better control the expansion process of the slip 410, ensuring that its expansion speed and strength meet the requirements of different plugging conditions. Therefore, by introducing the upper piston 350, the driving force and stability of the driving mechanism 300 are further enhanced, so that the drilling bridge plug can more efficiently and reliably achieve the anchoring and plugging of the oil well in the plugging operation.

[0064] Furthermore, the anchoring mechanism 400 further includes a lower support sleeve 420, such as Figure 4 and Figure 5 As shown, the lower support sleeve 420 is connected to the upper piston 350 , and one end of the lower support sleeve 420 facing the slip 410 is inclined and fits with the first inclined surface of the slip 410 .

[0065] During operation, when the upper piston 350 is pushed downward by the hydraulic pressure, the force is transmitted to the slip 410 through the lower support sleeve 420. Since the end of the lower support sleeve 420 facing the slip 410 is inclined and fits tightly with the first inclined surface of the slip 410, when the slip 410 cannot move horizontally, it will expand outward, so that the spikes are inserted into the sleeve, thereby achieving an anchoring effect. The inclined design of the lower support sleeve 420 ensures the consistency of the force transmission direction and the expansion direction of the slip 410, forming a stable anchoring structure.

[0066] The lower support sleeve 420 provides additional support for the anchoring mechanism 400. In particular, after the slips 410 expand, the lower support sleeve 420 can effectively withstand the pressure below and form a stable support structure by fitting with the inclined surface of the slips 410, ensuring that the drilling bridge plug is firmly anchored in the casing. The theoretical basis is that the inclined surface design of the lower support sleeve 420 perfectly fits the first inclined surface of the slips 410, increasing the contact area of ​​the anchoring structure and improving the stability and reliability of the anchoring. Through this setting, the slips 410 can be effectively prevented from sliding or becoming unstable under pressure, ensuring the smooth progress of the oil well plugging operation.

[0067] Preferably, the anchoring mechanism 400 further includes an upper support sleeve 430, such as Figure 4 and Figure 5 As shown, the upper support sleeve 430 is sleeved on the outer edge of the core shaft 310, and is arranged on the side of the cava 410 away from the lower support sleeve 420. The end facing the cava 410 is inclined and fits with the second inclined surface of the cava 410. The inclination angle is opposite to that of the inclined surface of the lower support sleeve 420, and is used to prevent the cava 410 from moving horizontally.

[0068] During operation, when the upper piston 350 is pushed downward by the hydraulic pressure, the force is transmitted to the slip 410 through the lower support sleeve 420, and the other side of the slip 410 obtains additional support through the upper support sleeve 430, and cannot move in translation, and will expand outward. Since the upper support sleeve 430 is tightly fitted with the second inclined surface of the slip 410, and the inclination angle of its inclined surface is opposite to that of the inclined surface of the lower support sleeve 420, this setting can provide uniform force distribution when the slip 410 expands, further ensuring the stable expansion and firm anchoring of the slip 410.

[0069] The design of the upper support sleeve 430 is symmetrical to that of the lower support sleeve 420. The end facing the slip 410 is inclined and fits with the second inclined surface of the slip 410, and the inclination angle is opposite to that of the inclined surface of the lower support sleeve 420. This design provides another important anchoring support point, further enhancing the stability and reliability of the drilling bridge plug. The fitting design of the upper support sleeve 430 and the slip 410 can effectively increase the contact area of ​​the anchoring structure and improve the stability of the anchoring. When the slip 410 expands outward, the inclined surface of the upper support sleeve 430 will provide additional support to prevent the slip 410 from being unstable or sliding. At the same time, the design of the upper support sleeve 430 is opposite to the inclination angle of the inclined surface of the lower support sleeve 420, so that a symmetrical force distribution can be formed when pressure is applied, further enhancing the firmness of the anchoring. Therefore, by introducing the upper support sleeve 430, an additional support point is provided, the stability and reliability of the anchoring mechanism 400 are enhanced, thereby further improving the effect and safety of the drilling bridge plug in the oil well plugging operation.

[0070] Preferably, the anchoring mechanism 400 further includes a skeleton rubber tube 440, such as Figure 4 , 5 As shown, it fits with the upper support sleeve 430 and is located on the side of the upper support sleeve 430 away from the slip 410 , and is used to provide support for the expansion of the slip 410 .

[0071] During operation, when the slips 410 expand outwards due to the force of the pushing mechanism 300, the skeleton rubber cylinder 440 plays an important supporting role. Through the fitting design with the upper support sleeve 430, the skeleton rubber cylinder 440 effectively increases the supporting area of ​​the anchoring mechanism 400. This close fit can form a uniform supporting surface, making the expansion process of the slips 410 more stable.

[0072] The main function of the skeleton rubber cylinder 440 is to provide additional support and stability for the expansion of the slips 410. Through the fitting design with the upper support sleeve 430, the skeleton rubber cylinder 440 can effectively increase the support area of ​​the anchoring mechanism 400, and improve the stability and firmness of the slips 410 when they expand. The fitting design of the skeleton rubber cylinder 440 and the upper support sleeve 430 can form a uniform support surface. When the slips 410 expand, the skeleton rubber cylinder 440 will be under pressure, thereby applying a supporting force outward to prevent the slips 410 from being unstable or sliding, further improving the effect and safety of the drilling bridge plug in the oil well plugging operation.

[0073] It should be noted that the above embodiments illustrate the utility model rather than limit the utility model, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation on the claims. The word "comprising" does not exclude the existence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the existence of multiple such elements. The utility model can be implemented by means of hardware including several different elements and by means of appropriately programmed computers. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names. The steps in the above embodiments should not be understood as limitations on the order of execution unless otherwise specified.

Claims

1. A drilling-while-drilling bridge plug for oil production, characterized in that: The drilling bridge plug is used to be arranged between two sections of drill pipe, and a well fluid flow channel is arranged in the middle portion thereof, which runs through the entire bridge plug, so as to ensure that the well fluid can flow normally during the drilling operation; The drilling bridge plug comprises the following components: Drill pipe connection mechanism: including an upper joint and a lower joint, which are used to connect the upper drill pipe and the lower drill pipe respectively; Pushing mechanism: arranged between the upper joint and the lower joint, used to push the anchoring mechanism to expand outward when the oil well needs to be plugged; Sliding mechanism: located inside the pushing mechanism, used to close the hydraulic port on the pushing mechanism during normal drilling operation, and moved downward to expose the hydraulic port when the oil well needs to be plugged, so that the liquid can flow through the hydraulic port to the specified position to generate hydraulic power; Anchoring mechanism: comprising slips, which are used to expand outwards under the action of the pushing mechanism to ensure that the drilling bridge plug can be firmly anchored in the casing.

2. The drilling-while-drilling bridge plug for oil production according to claim 1, characterized in that: The pushing mechanism comprises a core shaft, the hydraulic port is opened on the core shaft, and the sliding mechanism is connected to the core shaft.

3. The drilling-while-drilling bridge plug for oil production according to claim 2, characterized in that: The pushing mechanism includes: a moving piston and a piston cylinder, both of which are sleeved on the outer edge of the core shaft, and a hydraulic cavity is reserved between the moving piston and the piston cylinder. The moving piston is used to move toward the anchoring mechanism after the liquid flows into the hydraulic cavity through the hydraulic port to push the slip to expand outward.

4. The drilling-while-drilling bridge plug for oil production according to claim 3, characterized in that: The pushing mechanism further comprises a moving rod, which is arranged between the moving piston and the pushing mechanism and is used to push the slips to expand outwards; the moving rod is a threaded rod, and a threaded hole matching the moving rod is provided on the piston cylinder.

5. The drilling-while-drilling bridge plug for oil production according to claim 4, characterized in that: The pushing mechanism also includes an upper piston, which is arranged between the moving rod and the pushing mechanism and is used to push the slips to expand outwards.

6. The drilling-while-drilling bridge plug for oil production according to claim 5, characterized in that: The anchoring mechanism further comprises: a lower support sleeve, wherein the lower support sleeve is connected to the upper piston, and the end of the lower support sleeve facing the slip is inclined and fits with the first inclined surface of the slip.

7. The drilling-while-drilling bridge plug for oil production according to claim 6, characterized in that: The anchoring mechanism also includes: an upper support sleeve, which is sleeved on the outer edge of the core shaft, arranged on the side of the cava away from the lower support sleeve, with an inclined surface facing the cava, fitting with the second inclined surface of the cava, and opposite to the inclination angle of the inclined surface of the lower support sleeve, for preventing the cava from moving horizontally.

8. The drilling-while-drilling bridge plug for oil production according to claim 7, characterized in that: The anchoring mechanism further comprises: a skeleton rubber cylinder, which is fitted with the upper support sleeve and is located at a side of the upper support sleeve away from the slip, and is used to provide support for the expansion of the slip.

9. The drilling-while-drilling bridge plug for oil production according to claim 2, characterized in that: The sliding mechanism comprises an upper sliding sleeve and a lower sliding sleeve, wherein the upper sliding sleeve and the lower sliding sleeve are connected to the core shaft through a first shear nail and a second shear nail respectively, and the lower sliding sleeve is used to block the hydraulic port during normal drilling operation.

10. The drilling-while-drilling bridge plug for oil production according to claim 2, characterized in that: An open groove is provided at the lower end of the upper joint, and the open groove is connected to a locking groove. A locking protrusion is provided at the outer edge of the core shaft. Under normal operating conditions, the locking protrusion is accommodated in the locking groove. When it is necessary to release the hand, the locking protrusion escapes through the open groove to separate the upper joint from the core shaft.

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