CN111255412A - Salvageable mechanical plugging bridge plug for emergency and method - Google Patents
Salvageable mechanical plugging bridge plug for emergency and method Download PDFInfo
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- CN111255412A CN111255412A CN202010242306.3A CN202010242306A CN111255412A CN 111255412 A CN111255412 A CN 111255412A CN 202010242306 A CN202010242306 A CN 202010242306A CN 111255412 A CN111255412 A CN 111255412A
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- bridge plug
- rubber cylinder
- pressure balance
- emergency
- salvageable
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
Abstract
The invention belongs to the technical field of emergency rescue operation of oil and gas fields, and particularly relates to a salvageable mechanical bridge plug for rescue and a method. The invention is formed by combining a stress hand losing bar, a setting starting shear pin, a recovery joint, an upper central pipe, a connecting pin, a pressure balancing mechanism, a rubber cylinder compression mechanism, a slip sleeve, a slip, a retraction spring, a pawl, a deblocking shear pin, a lower central pipe, a pressing cap, a lower cone, a C-shaped ring and a lower joint. The invention realizes that the slips are firstly propped open in the setting process, ensures that the bridge plug recompresses the rubber cylinder under the anchoring state of the slips, protects the rubber cylinder and realizes reliable dynamic setting plugging. According to the pressure balancing mechanism, the upper pressure and the lower pressure of the bridge plug are balanced, and then the bridge plug is unsealed, so that the safety of salvaging and recovering operation of the salvaging type mechanical plugging bridge plug is ensured. The pressure balance shell and the upper guide ring are made of high-strength aluminum alloy materials, and when the bridge plug cannot be normally unsealed, the bridge plug rubber cylinder and the slips are quickly retracted by milling the outer edge of the bridge plug.
Description
Technical Field
The invention belongs to the technical field of emergency rescue operation of oil and gas fields, and particularly relates to a salvageable mechanical bridge plug for rescue and a method.
Background
At present, when a pumping bridge plug fracturing or coiled tubing dragging fracturing construction is adopted in a gas well, a wellhead is always in a high-pressure bearing state, if a large four-way joint of the wellhead is punctured in the construction process, high pressure in the well can be out of control to jet and leak, and at the moment, out of control pressure in the well needs emergency operation and plugging. The traditional emergency treatment process method is to rush down an oil pipe to a preset depth, to perform circulating well killing, and to circularly remove the well killing fluid to discharge liquid for production after the problem of wellhead puncture is solved.
However, for a construction well with higher pressure, the well killing is not easy to realize by adopting a circulating well killing mode after the well head has a dangerous case, and if a well killing hydraulic well with overlarge specific gravity is adopted, the reservoir is easy to be seriously polluted or killed to destroy the reservoir. If the bridge plug is adopted for plugging emergency, tools and process problems that the conventional mechanical bridge plug is difficult to reliably realize setting plugging and the like exist under the working conditions of high pressure and liquid flowing in the well.
Disclosure of Invention
The invention provides a salvageable mechanical plugging bridge plug for emergency and a method thereof, and aims to provide a plugging bridge plug and a method thereof, which can safely use the mechanical bridge plug for emergency operation under the working conditions of wellhead puncture, high pressure in a well and liquid flow.
In order to achieve the purpose, the invention adopts the technical scheme that:
a salvageable mechanical plugging bridge plug for emergency comprises a stress hand losing rod, a setting starting shear pin, a recovering joint, an upper central pipe, a connecting pin, a pressure balancing mechanism, a rubber sleeve compression mechanism, a slip sleeve, a slip, a retraction spring, a pawl, a deblocking shear pin, a lower central pipe, a pressing cap, a lower cone, a C-shaped ring and a lower joint; the upper central pipe, the pressure balancing mechanism and the recovery joint are sequentially sleeved on the upper part of the stress releasing rod from inside to outside; the pressure balance mechanism is fixed with the upper part of the upper central tube through a setting starting shear pin; the recovery joint is fixed with the upper part of the pressure balance mechanism through a recovery starting shear pin; two ends of the connecting pin respectively penetrate through the lower central pipe, the upper central pipe and the side wall of the pressure balance mechanism to be contacted with the inner side wall of the recovery joint; the rubber cylinder compression mechanism is sleeved on the upper central pipe, and the upper end of the rubber cylinder compression mechanism is contacted with the outer side wall of the lower end of the pressure balance mechanism; the lower end of the upper central tube is sleeved on the lower central tube; the upper part of the pawl is connected with the lower part of the upper central pipe, and the lower part of the pawl is fixed with the lower central pipe through a deblocking shear pin; the slips and the lower cone are sequentially arranged on the periphery of the pawl from top to bottom, the slips are arranged between the lower cone and the rubber cylinder compression mechanism, a spring groove is formed in the middle of the slips, a retraction spring is arranged in the spring groove, and the retraction spring is fixed with a slip sleeve arranged on the periphery of the slips; the upper part of the slip sleeve is connected with the rubber cylinder compression mechanism, and the lower part of the slip sleeve is connected with the lower cone; the pressing cap is arranged between the lower part of the slip sleeve and the lower cone; the lower joint is connected to the lower part of the lower cone, and the C-shaped ring is arranged in a space among the pawl, the lower joint and the lower cone.
The pressure balance mechanism comprises a pressure balance body and a pressure balance shell; the pressure balance shell is hermetically sleeved at the lower part of the pressure balance body, and the upper part of the pressure balance shell extends to a position between the pressure balance body and the recovery joint; the lower end of the pressure balance shell is in contact with the rubber cylinder compression mechanism.
The pressure balance shell is made of high-strength aluminum alloy material with the tensile strength of more than 480 MPa.
The rubber cylinder compression mechanism comprises a rubber cylinder compression starting mechanism, an upper guide ring and a rubber cylinder assembly; the upper guide ring and the rubber cylinder assembly are sleeved on the rubber cylinder compression starting mechanism from top to bottom; the upper end surface of the upper guide ring is contacted with the pressure balance mechanism.
The rubber cylinder component comprises a plurality of rubber cylinders and a plurality of spacer rings; the spacer ring is arranged between the adjacent rubber cylinders.
The rubber cylinder compression starting mechanism comprises a lower guide ring, a rubber cylinder compression starting shear pin, a rubber cylinder seat, a locking ring and an upper cone; the lower guide ring is sleeved at the lower end of the rubber cylinder seat, the upper end of the upper cone is arranged between the lower guide ring and the rubber cylinder seat and is in threaded connection with the inner side wall of the lower end of the lower guide ring, the lower end of the upper cone is arranged between the pawl and the slip sleeve, and the lower guide ring, the rubber cylinder seat and the upper end of the upper cone are compressed by the rubber cylinder to start shear nails to be fixed; the locking ring is arranged between the lower end of the rubber cylinder seat and the upper central pipe and is respectively in threaded connection with the lower end of the rubber cylinder seat and the upper central pipe, and the lower end of the rubber cylinder seat is fixed with the locking ring through a fixing screw.
The upper guide ring is made of high-strength aluminum alloy material with the tensile strength of more than 480 MPa.
A rescue method for salvaging mechanical plugging bridge plug for rescue comprises the following steps
The method comprises the following steps: after a puncture and leakage situation occurs in a fractured wellhead, when emergency operation is needed to control a dangerous situation, a salvageable mechanical plugging bridge plug for emergency, a bridge plug hydraulic setting tool, a safety release, a coiled tubing connector and a coiled tubing are sequentially connected from bottom to top, and the salvageable mechanical plugging bridge plug for emergency is lowered to a preset position by means of the coiled tubing;
step two: after the first step is finished, performing circulating well killing by means of an oil sleeve communication channel of a bridge plug hydraulic setting tool, if dangerous situations can be controlled through well killing, processing the dangerous situations according to a conventional successful well killing processing scheme, and if the dangerous situations cannot be controlled through well killing, performing a third step;
step three: throwing a steel ball to press and start a bridge plug hydraulic setting tool, setting a release and emergency salvage salvageable mechanical plugging bridge plug, and plugging underground high pressure by the salvageable mechanical plugging bridge plug; in the early stage of the emergency rescue landing plug setting process of the fishable mechanical plugging bridge plug, a setting starting shear pin is cut off, a hydraulic bridge plug setting tool pulls a stress throwing rod, an upper central pipe, a pawl, a lower central pipe, a C-shaped ring, a lower joint and a lower cone to displace upwards together, so that a slip is gradually propped open, after the slip is propped open and anchored, a rubber sleeve is compressed to start the shear pin to be cut off, and the rubber sleeve starts to be compressed and starts and completes the compression plugging action;
step four: replacing the wellhead damaged by wellhead puncture, and removing wellhead dangerous cases;
step five: with the help of a salvaging and recovering tool, the unsetting salvaging of the salvaging type mechanical blocking bridge plug for underground emergency is completed; after the emergency dangerous situation is relieved, when the salvaging type mechanical plugging bridge plug is used for salvaging, recovering and rescuing to lift the pipe column, after the recovery starting shear pin is cut off, the recovery joint drives the pressure balance shell to move upwards relative to the pressure balance body, the upper pressure balance channel and the lower pressure balance channel of the salvaging type mechanical plugging bridge plug are opened, the upper pressure and the lower pressure of the salvaging type mechanical plugging bridge plug are gradually balanced in the emergency, and the slip is always kept in an anchoring state in the process; when the upper pressure and the lower pressure of the bridge plug are balanced, the slips are gradually retracted to release the anchoring and complete the unsealing action after enough drilling pressure is applied to shear the unsealing shear pin.
Has the advantages that:
1. the invention adopts the structural design of the rubber cylinder compression starting mechanism, thereby having the characteristic of the sequence of firstly opening the slips and then compressing the rubber cylinder in the setting process, ensuring that the bridge plug recompresses the rubber cylinder in the anchoring state of the slips, protecting the rubber cylinder, realizing reliable dynamic setting plugging, and adapting to the working condition environment of emergency operation for realizing dynamic reliable setting under high pressure and liquid flow in a well.
2. The invention adopts the structural design of the pressure balance mechanism, after the danger situation is relieved, the pressure balance mechanism can be used for balancing the pressure of the bridge plug from top to bottom and then unsealing the bridge plug, thereby realizing the safe salvaging and recovery of the bridge plug and ensuring the safety of salvaging and recovering operation of the salvaging type mechanical plugging bridge plug.
3. The pressure balance shell and the upper guide ring are made of high-strength aluminum alloy materials with the tensile strength larger than 480MPa, and have the characteristic of easy drilling and grinding.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic illustration of the present invention as it is run into a tubular string;
FIG. 3 is a schematic structural diagram of a retrievable mechanical plug pipe string for launching a hydraulic setting tool of a bridge plug by ball throwing and pressing and setting emergency rescue.
In the figure: 1-stress hand loss bar; 2-setting and starting the shear pin; 3, recovering and starting the shear pins; 4-recovery joint; 5-upper central tube; 6-connecting pin; 7-a pressure balancing body; 8-a pressure-balanced housing; 9-upper guide ring; 10-a rubber cylinder; 11-spacer ring; 12-a lower guide ring; 13-rubber cylinder compression starts shear pins; 14-; rubber cylinder seat 15-fixing screw; 16-a locking ring; 17-an upper cone; 18-slip cover; 19-slips; 20-a retraction spring; 21-a pawl; 22-unsealing the shear pins; 23-lower center tube; 24-pressing the cap; 25-lower cone; 26-C ring; 27-lower joint; 28-emergency salvage type mechanical plugging bridge plug; 29-bridge plug hydraulic setting tool; 30-safe releasing; 31-coiled tubing connector; 32-coiled tubing; 33-steel ball.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-3, a salvageable mechanical plugging bridge plug for emergency rescue comprises a stress lost-hand rod 1, a setting starting shear pin 2, a recovery starting shear pin 3, a recovery joint 4, an upper central pipe 5, a connecting pin 6, a pressure balancing mechanism, a rubber sleeve compression mechanism, a slip sleeve 18, a slip 19, a retraction spring 20, a pawl 21, a deblocking shear pin 22, a lower central pipe 23, a pressing cap 24, a lower cone 25, a C-shaped ring 26 and a lower joint 27; the upper central pipe 5, the pressure balancing mechanism and the recovery joint 4 are sequentially sleeved on the upper part of the stress hand losing bar 1 from inside to outside; the pressure balance mechanism is fixed with the upper part of the upper central tube 5 through a setting starting shear pin 2; the recovery joint 4 is fixed with the upper part of the pressure balance mechanism through the recovery starting shear pin 3; two ends of the connecting pin 6 respectively penetrate through the lower central tube 23, the upper central tube 5 and the side wall of the pressure balance mechanism to be contacted with the inner side wall of the recovery joint 4; the rubber cylinder compression mechanism is sleeved on the upper central tube 5, and the upper end of the rubber cylinder compression mechanism is contacted with the outer side wall of the lower end of the pressure balance mechanism; the lower end of the upper central tube 5 is sleeved on the lower central tube 23; the upper part of the pawl 21 is connected with the lower part of the upper central tube 5, and the lower part of the pawl 21 is fixed with the lower central tube 23 through a deblocking shear pin 22; the slip 19 and the lower cone 25 are sequentially arranged on the periphery of the pawl 21 from top to bottom, the slip 19 is arranged between the lower cone 25 and the rubber cylinder compression mechanism, a spring groove is formed in the middle of the slip 19, a retraction spring 20 is arranged in the spring groove, and the retraction spring 20 is fixed with a slip sleeve 18 arranged on the periphery of the slip 19; the upper part of the slip sleeve 18 is connected with a rubber cylinder compression mechanism, and the lower part of the slip sleeve 18 is connected with a lower cone 25; the pressing cap 24 is arranged between the lower part of the slip sleeve 18 and the lower cone 25; the lower joint 27 is connected to the lower portion of the lower cone 25, and the C-shaped ring 26 is disposed in a space between the ratchet 21, the lower joint 27 and the lower cone 25.
In practical use, the invention, a bridge plug hydraulic setting tool 29, a safety release 30, a coiled tubing connector 31 and a coiled tubing 32 are connected in sequence from bottom to top, and the invention is lowered to a preset position by the aid of the coiled tubing 32; then, the oil sleeve communication channel of the bridge plug hydraulic setting tool 29 is used for carrying out circulating well killing, if the dangerous case can be controlled through well killing, the dangerous case is processed according to the conventional successful well killing processing scheme, if the dangerous case can not be controlled through well killing, a steel ball 33 is thrown to press and start the bridge plug hydraulic setting tool 29, the bridge plug 28 is sealed by salvageable machinery for setting, releasing, rescuing and blocking underground high pressure by the salvageable mechanical sealing bridge plug 28 for rescuing; in the early stage of the setting process of the salvageable mechanical plugging bridge plug 28 for emergency, the setting starting shear pin 2 is sheared, the hydraulic bridge plug setting tool 29 pulls the stress throwing rod 1, the upper central pipe 5, the pawl 21, the lower central pipe 23, the C-shaped ring 26, the lower joint 27 and the lower cone 25 to displace upwards together, so that the slips 19 are gradually spread, and after the spreading and anchoring actions of the slips 19 are finished, the rubber sleeve compression starting mechanism is started and the compression plugging action is finished; and then, replacing the wellhead damaged by wellhead puncture to remove the wellhead dangerous case. The fishing and recovery tool is used for completing the deblocking and fishing of the fishable mechanical blocking bridge plug 28 for underground emergency; after the emergency dangerous situation is relieved, when the salvaging and recovery salvageable mechanical plugging bridge plug 28 is used for lifting the pipe column, after the recovery starting shear pin 3 is cut off, the recovery joint 4 moves upwards relative to the pressure balance mechanism, the upper pressure and lower pressure communication balance channel of the salvaging salvageable mechanical plugging bridge plug 28 is opened, the upper pressure and lower pressure of the salvaging salvageable mechanical plugging bridge plug 28 are gradually balanced, and the slips 19 are always kept in an anchoring state in the process; when the pressure above and below the plug is balanced, the slips 19 are gradually retracted to release the anchor and complete the unsetting action by applying sufficient weight on bit to shear the unsetting shear pin 22.
The invention adopts the structural design of the rubber cylinder compression starting mechanism, thereby having the characteristic of the sequence of firstly opening the slips and then starting the rubber cylinder compression starting mechanism in the setting process, ensuring that the bridge plug recompresses the rubber cylinder under the anchoring state of the slips, protecting the rubber cylinder, realizing reliable dynamic setting plugging, and adapting to the working condition environment of emergency operation for realizing dynamic reliable setting under high pressure and liquid flow in a well.
The invention adopts the structural design of the pressure balance mechanism, after the danger situation is relieved, the pressure balance mechanism can be used for balancing the pressure of the bridge plug from top to bottom and then unsealing the bridge plug, thereby realizing the safe salvaging and recovery of the bridge plug and ensuring the safety of salvaging and recovering operation of the salvaging type mechanical plugging bridge plug.
Example two:
referring to fig. 1, a salvageable mechanical plugging bridge plug for emergency use is different from the first embodiment in that: the pressure balance mechanism comprises a pressure balance body 7 and a pressure balance shell 8; the pressure balance shell 8 is hermetically sleeved at the lower part of the pressure balance body 7, and the upper part of the pressure balance shell 8 extends to a position between the pressure balance body 7 and the recovery joint 4; the lower end of the pressure balance shell 8 is in contact with the rubber cylinder compression mechanism.
In actual use, after the emergency dangerous situation is relieved, the unsetting, salvaging and recovering of the salvageable mechanical sealing bridge plug 28 for underground emergency can be completed by means of a salvaging and recovering tool; when the salvaging and recovering salvageable mechanical plugging bridge plug 28 is used for lifting a pipe column, after the recovery starting shear pin 3 is sheared off, the recovery joint 4 drives the pressure balance shell 8 to move upwards relative to the pressure balance body 7, the upper pressure and lower pressure communication balance channel of the salvaging salvageable mechanical plugging bridge plug 28 is opened, the upper pressure and lower pressure of the salvaging salvageable mechanical plugging bridge plug 28 are gradually balanced, and the slips 19 are always kept in an anchoring state in the process; when the pressure above and below the plug is balanced, the slips 19 are gradually retracted to release the anchor and complete the unsetting action by applying sufficient weight on bit to shear the unsetting shear pin 22. After the danger-leaking situation is relieved, the pressure balance mechanism can be used for balancing the pressure of the bridge plug up and down and then unsealing the bridge plug, so that the bridge plug can be safely salvaged and recovered, and the safety of salvage and recovery operation of the salvageable mechanical plugging bridge plug for emergency rescue is ensured.
Example three:
referring to fig. 1, a salvageable mechanical plugging bridge plug for emergency use is different from the first embodiment in that: the pressure balance shell 8 is made of high-strength aluminum alloy material with the tensile strength larger than 480 MPa.
When in actual use, the pressure balance shell 8 adopts the high strength aluminium alloy material that tensile strength is greater than 480MPa, and make full use of it has the characteristics of easy brill and grind, and when the unable normal realization deblocking of bridging plug, accessible bushing milling bridging plug pressure balance shell 8 realizes that bridging plug packing element and slips retract fast to realize the reliable deblocking of bridging plug and salvage.
Example four:
referring to fig. 1, a salvageable mechanical plugging bridge plug for emergency use is different from the first embodiment in that: the rubber cylinder compression mechanism comprises a rubber cylinder compression starting mechanism, an upper guide ring 9 and a rubber cylinder assembly; the upper guide ring 9 and the rubber cylinder assembly are sleeved on the rubber cylinder compression starting mechanism from top to bottom; the upper end surface of the upper guide ring 9 is contacted with the pressure balance mechanism.
In practical use, in the early stage of the setting process of the salvageable mechanical plugging bridge plug 28 for emergency rescue, the setting starting shear pin 2 is cut off, the hydraulic bridge plug setting tool 29 pulls the stress lost hand rod 1, the upper central pipe 5, the pawl 21, the lower central pipe 23, the C-shaped ring 26, the lower joint 27 and the lower cone 25 to displace upwards together, so that the slip 19 is gradually spread, after the spreading and anchoring action of the slip 19 is completed, the rubber sleeve compression starting shear pin 13 is cut off, the rubber sleeve 10 starts to be compressed and gradually plugs an annular space between the outer surface of the salvageable mechanical plugging bridge plug 28 for emergency rescue and the inner surface of the sleeve, and underground high pressure is sealed, so that a safe wellhead operation environment is created for replacing a wellhead damaged by wellhead puncture and relieving wellhead dangerous situations.
Example five:
referring to fig. 1, a salvageable mechanical plugging bridge plug for emergency use is different from the first embodiment in that: the rubber cylinder component comprises a plurality of rubber cylinders 10 and a plurality of spacer rings 11; the spacer rings 11 are arranged between adjacent rubber cylinders 10.
In practical use, in the setting process of the salvageable mechanical plugging bridge plug 28 for emergency, after the slip 19 finishes the expanding and anchoring action, the rubber sleeve compression starts the shear pin 13 to be sheared off, the plurality of rubber sleeves 10 respectively start to be compressed and gradually respectively plug the annular space between the outer surface of the salvageable mechanical plugging bridge plug 28 for emergency and the inner surface of the casing, meanwhile, the plurality of spacer rings 11 move upwards, and finally the plurality of rubber sleeves 10 form a plurality of plugging points, so that the reliability of underground high pressure plugging is improved, a safe and reliable wellhead operation environment is created for replacing a wellhead damaged by wellhead puncture and removing wellhead dangerous situations.
Example six:
referring to fig. 1, a salvageable mechanical plugging bridge plug for emergency use is different from the first embodiment in that: the rubber sleeve compression starting mechanism comprises a lower guide ring 12, a rubber sleeve compression starting shear pin 13, a rubber sleeve seat 14, a locking ring 16 and an upper cone 17; the lower guide ring 12 is sleeved at the lower end of the rubber cylinder seat 14, the upper end of the upper cone 17 is arranged between the lower guide ring 12 and the rubber cylinder seat 14 and is in threaded connection with the inner side wall of the lower end of the lower guide ring 12, the lower end of the upper cone 17 is arranged between the pawl 21 and the slip sleeve 18, and the upper ends of the lower guide ring 12, the rubber cylinder seat 14 and the upper cone 17 are fixed by the rubber cylinder compression starting shear pin 13; the locking ring 16 is arranged between the lower end of the rubber cylinder seat 14 and the upper central tube 5, and is respectively in threaded connection with the lower end of the rubber cylinder seat 14 and the upper central tube 5, and the lower end of the rubber cylinder seat 14 is fixed with the locking ring 16 through a fixing screw 15.
In practical use, the invention, a bridge plug hydraulic setting tool 29, a safety releasing tool 30, a coiled tubing connector 31 and a coiled tubing 32 are sequentially connected from bottom to top, the invention is put into a preset position by the coiled tubing 32, if dangerous situations can not be controlled by killing, a steel ball 33 is thrown to press and start the bridge plug hydraulic setting tool 29, the bridge plug hydraulic setting tool 29 is used for pressing and setting the bridge plug 28 for emergency rescue by a fishing type mechanical plugging, the setting start shear pin 2 is sheared at the early stage of the setting process of the bridge plug 28 for emergency rescue by the fishing type mechanical plugging, the bridge plug hydraulic setting tool 29 pulls the stress lost hand rod 1, the upper central tube 5, the pawl 21, the lower central tube 23, the C-shaped ring 26, the lower connector 27 and the lower cone 25 to displace upwards together so that the slips 19 are gradually opened, and after the opening and anchoring actions of the slips 19 are completed, the rubber barrel compression start shear pin 13 is sheared, the rubber sleeve compression starting mechanism is started, the lower guide ring 12 and the upper cone 17 move upwards relative to the rubber sleeve seat 14, the rubber sleeves 10 respectively start to be compressed and gradually and respectively plug an annular space between the outer surface of the salvageable mechanical plug bridge 28 for emergency rescue and the inner surface of the sleeve, meanwhile, the spacer rings 11 move upwards, and finally, a plurality of plugging points are formed by the rubber sleeves 10 to plug underground high pressure. The salvageable mechanical plugging bridge plug 28 for emergency adopts the structural design of the rubber sleeve compression starting mechanism, so that the characteristic of the sequence that the slips 19 are firstly propped open and then the compression rubber sleeve 10 is started is achieved in the setting process, the bridge plug can be guaranteed to recompress the rubber sleeve in the anchoring state of the slips, the rubber sleeve is protected, reliable dynamic setting plugging is achieved, and meanwhile, the salvageable mechanical plugging bridge plug is suitable for the emergency operation working condition environment for achieving dynamic reliable setting plugging under high pressure and liquid flowing in a well.
Example seven:
referring to fig. 1, a salvageable mechanical plugging bridge plug for emergency use is different from the first embodiment in that: the upper guide ring 9 is made of high-strength aluminum alloy material with the tensile strength of more than 480 MPa.
During the in-service use, go up the guide ring 9 and adopt the high strength aluminum alloy material high strength aluminium material that tensile strength is greater than 480MPa, make full use of it has the characteristics of easy brill and grind, when the unable normal realization deblocking of bridging plug, the accessible bushing mills guide ring 9, realizes that bridging plug packing element and slips retract fast to the reliable deblocking of realization bridging plug is salvaged.
Example eight:
referring to fig. 2 and 3, the emergency method for fishing type mechanical plugging bridge plug for emergency comprises the following steps
The method comprises the following steps: after a puncture and leakage situation occurs in a fractured wellhead, when emergency operation is needed to control the dangerous situation, the salvageable mechanical plugging bridge plug 28 for emergency, the bridge plug hydraulic setting tool 29, the safety release 30, the coiled tubing connector 31 and the coiled tubing 32 are sequentially connected from bottom to top, and the salvageable mechanical plugging bridge plug 28 for emergency is lowered to a preset position by means of the coiled tubing 32;
step two: after the first step is finished, performing circulating killing by means of an oil sleeve communication channel of the bridge plug hydraulic setting tool 29, if the dangerous case can be controlled by killing, processing the dangerous case according to a conventional successful killing processing scheme, and if the dangerous case can not be controlled by killing, performing a third step;
step three: a steel ball 33 is thrown to press and start a bridge plug hydraulic setting tool 29, a salvageable mechanical plugging bridge plug 28 for setting releasing and emergency rescue is used, and underground high pressure is plugged by the salvageable mechanical plugging bridge plug 28 for emergency rescue; in the early stage of the setting process of the salvageable mechanical plugging bridge plug 28 for emergency, the setting starting shear pin 2 is cut off, the hydraulic bridge plug setting tool 29 pulls the stress throwing rod 1, the upper central pipe 5, the pawl 21, the lower central pipe 23, the C-shaped ring 26, the lower joint 27 and the lower cone 25 to displace upwards together, so that the slips 19 are gradually spread, after the spreading and anchoring actions of the slips 19 are finished, the rubber sleeve compression starting shear pin 13 is cut off, and the rubber sleeve 10 starts to be compressed and started and finishes the compression plugging actions;
step four: replacing the wellhead damaged by wellhead puncture, and removing wellhead dangerous cases;
step five: the fishing and recovery tool is used for completing the deblocking and fishing of the fishable mechanical blocking bridge plug 28 for underground emergency; after the emergency dangerous situation is relieved, when the salvaging and recovery emergency salvageable mechanical plugging bridge plug 28 lifts the pipe column, after the recovery starting shear pin 3 is cut off, the recovery joint 4 drives the pressure balance shell 8 to move upwards relative to the pressure balance body 7, the upper and lower pressure balance channels of the salvaging emergency mechanical plugging bridge plug 28 are opened, the upper and lower pressures of the salvaging emergency mechanical plugging bridge plug 28 are gradually balanced, and the slips 19 are always kept in an anchoring state in the process; when the pressure above and below the plug is balanced, the slips 19 are gradually retracted to release the anchor and complete the unsetting action by applying sufficient weight on bit to shear the unsetting shear pin 22.
In practical use, firstly, the salvageable mechanical plugging bridge plug 28 for emergency, the bridge plug hydraulic setting tool 29, the safety release 30, the coiled tubing connector 31 and the coiled tubing 32 are sequentially connected from bottom to top, and the salvageable mechanical plugging bridge plug 28 for emergency is lowered to a preset position by means of the coiled tubing 32; then, trying to perform circulating killing by means of an oil sleeve communication channel of the bridge plug hydraulic setting tool 29, if the dangerous case can be controlled through killing, processing the dangerous case according to a conventional successful killing processing scheme, if the dangerous case cannot be controlled through killing, throwing a steel ball 33 to press and start the bridge plug hydraulic setting tool 29, setting the bridge plug 28 for releasing the seal and rescuing, and blocking underground high pressure by means of the bridge plug 28 for rescuing; in the early stage of the setting process of the salvageable mechanical plugging bridge plug 28 for emergency, the setting starting shear pin 2 is sheared off, the hydraulic bridge plug setting tool 29 pulls the stress throwing hand rod 1, the upper central tube 5, the pawl 21, the lower central tube 23, the C-shaped ring 26, the lower joint 27 and the lower cone 25 to displace upwards together, only the slips 19 are gradually propped open, and the rubber sleeve 10 cannot be compressed in the process. After the slips 19 are propped open and anchored, the rubber sleeve compression starting shear pin 13 is sheared, the rubber sleeve 10 starts to be compressed and started and completes the compression plugging action, namely, the salvageable mechanical plugging bridge plug 28 for emergency has the characteristic of the sequence of the first propping of the slips 19 and the subsequent compression of the rubber sleeve 10 in the setting process, the rubber sleeve 10 is guaranteed to be recompressed in the anchoring state of the slips 19 in the bridge plug setting process, the damage to the rubber sleeve 10 caused by the upward movement of a tool due to high pressure in the well in the bridge plug setting process under the emergency working condition is prevented, the working condition environment of realizing dynamic reliable setting under the high pressure in the well and the liquid flow is adapted, and finally high-pressure liquid in the well is reliably plugged. And then, replacing the wellhead damaged by wellhead puncture to remove the wellhead dangerous case. Then, with the help of a salvaging and recovering tool, the unsetting salvaging of the salvaging type mechanical blocking bridge plug 28 for the underground emergency is completed; after the emergency dangerous situation is relieved, when the salvaging and recovery emergency salvageable mechanical plugging bridge plug 28 lifts the pipe column, after the recovery starting shear pin 3 is cut off, the recovery joint 4 drives the pressure balance shell 8 to move upwards relative to the pressure balance body 7, the upper and lower pressure communication balance channel of the salvaging emergency salvageable mechanical plugging bridge plug 28 is opened, the upper and lower pressures of the salvaging emergency mechanical plugging bridge plug 28 are gradually balanced, and the slips 19 are always kept in an anchoring state in the process; only after the upper pressure and the lower pressure of the bridge plug are balanced, the slip 19 is gradually retracted to remove the anchoring and complete the unsealing action after enough drilling pressure is applied to shear the unsealing shear pin 22, namely after the wellhead stabbing and leaking danger is removed, the upper pressure and the lower pressure of the bridge plug are firstly balanced by the bridge plug pressure balancing mechanism, then the bridge plug is unsealed, the situation that the lower part of the bridge plug pushes the bridge plug to rapidly move upwards to bend the operating oil pipe under the high pressure push in the process of unsealing the bridge plug is prevented, the operating risk is prevented, and the safety of the salvaging and recycling operation of the bridge plug is ensured.
In conclusion, the invention is formed by organically combining a stress hand losing rod, a setting starting shear pin, a recovery joint, an upper central pipe, a connecting pin, a pressure balancing mechanism, a rubber cylinder compression mechanism, a slip sleeve, a slip, a retraction spring, a pawl, a deblocking shear pin, a lower central pipe, a pressing cap, a lower cone, a C-shaped ring and a lower joint. The invention adopts the structural design of the rubber cylinder compression starting mechanism, thereby having the characteristic of the sequence of firstly opening the slips and then compressing the rubber cylinder in the setting process, ensuring that the bridge plug recompresses the rubber cylinder in the anchoring state of the slips, protecting the rubber cylinder, realizing reliable dynamic setting plugging, and adapting to the working condition environment of emergency operation for realizing dynamic reliable setting under high pressure and liquid flow in a well. The invention adopts the structural design of the pressure balance mechanism, and can balance the pressure of the bridge plug up and down by means of the pressure balance mechanism and unseal the bridge plug after the danger-stabbing and leakage situation is relieved, thereby realizing the safe salvaging and recovery of the bridge plug and ensuring the safety of salvaging and recovering operation of the salvaging type mechanical plugging bridge plug. The pressure balance shell and the upper guide ring are made of high-strength aluminum alloy materials with the tensile strength larger than 480MPa, and have the characteristic of easy drilling and grinding, when the bridge plug cannot be normally unsealed, the retraction of the bridge plug rubber sleeve and the slips can be quickly realized by milling the outer edges of the pressure balance shell and the upper guide ring of the bridge plug, and therefore the reliable unsealing and fishing of the bridge plug can be realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a but salvage formula mechanical plugging bridging plug which characterized in that for emergency: the device comprises a stress lost hand rod (1), a setting starting shear pin (2), a recovery starting shear pin (3), a recovery joint (4), an upper central pipe (5), a connecting pin (6), a pressure balancing mechanism, a rubber cylinder compression mechanism, a slip sleeve (18), a slip (19), a retraction spring (20), a pawl (21), a deblocking shear pin (22), a lower central pipe (23), a pressing cap (24), a lower cone (25), a C-shaped ring (26) and a lower joint (27); the upper central pipe (5), the pressure balance mechanism and the recovery joint (4) are sequentially sleeved on the upper part of the stress hand losing bar (1) from inside to outside; the pressure balance mechanism is fixed with the upper part of the upper central pipe (5) through a setting starting shear pin (2); the recovery joint (4) is fixed with the upper part of the pressure balance mechanism through a recovery starting shear pin (3); two ends of the connecting pin (6) respectively penetrate through the lower central pipe (23), the upper central pipe (5) and the side wall of the pressure balance mechanism to be contacted with the inner side wall of the recovery joint (4); the rubber cylinder compression mechanism is sleeved on the upper central pipe (5), and the upper end of the rubber cylinder compression mechanism is contacted with the outer side wall of the lower end of the pressure balance mechanism; the lower end of the upper central tube (5) is sleeved on the lower central tube (23); the upper part of the pawl (21) is connected with the lower part of the upper central tube (5), and the lower part of the pawl (21) is fixed with the lower central tube (23) through a deblocking shear pin (22); the slip (19) and the lower cone (25) are sequentially arranged on the periphery of the pawl (21) from top to bottom, the slip (19) is arranged between the lower cone (25) and the rubber cylinder compression mechanism, a spring groove is formed in the middle of the slip (19), a retraction spring (20) is arranged in the spring groove, and the retraction spring (20) is fixed with a slip sleeve (18) arranged on the periphery of the slip (19); the upper part of the slip sleeve (18) is connected with the rubber cylinder compression mechanism, and the lower part of the slip sleeve (18) is connected with the lower cone (25); the pressing cap (24) is arranged between the lower part of the slip sleeve (18) and the lower cone (25); the lower joint (27) is connected to the lower part of the lower cone (25), and the C-shaped ring (26) is arranged in a space among the pawl (21), the lower joint (27) and the lower cone (25).
2. The salvageable mechanical plugging bridge plug for emergency use as claimed in claim 1, wherein: the pressure balance mechanism comprises a pressure balance body (7) and a pressure balance shell (8); the pressure balance shell (8) is sleeved on the lower part of the pressure balance body (7) in a sealing manner, and the upper part of the pressure balance shell (8) extends to a position between the pressure balance body (7) and the recovery joint (4); the lower end of the pressure balance shell (8) is in contact with the rubber cylinder compression mechanism.
3. The salvageable mechanical plugging bridge plug for emergency use as claimed in claim 1, wherein: the pressure balance shell (8) is made of high-strength aluminum alloy material with the tensile strength larger than 480 MPa.
4. The salvageable mechanical plugging bridge plug for emergency use as claimed in claim 1, wherein: the rubber cylinder compression mechanism comprises a rubber cylinder compression starting mechanism, an upper guide ring (9) and a rubber cylinder assembly; the upper guide ring (9) and the rubber cylinder assembly are sleeved on the rubber cylinder compression starting mechanism from top to bottom; the upper end surface of the upper guide ring (9) is contacted with the pressure balance mechanism.
5. The salvageable mechanical plugging bridge plug for emergency use according to claim 4, wherein: the rubber cylinder component comprises a plurality of rubber cylinders (10) and a plurality of spacer rings (11); the spacer ring (11) is arranged between the adjacent rubber cylinders (10).
6. The salvageable mechanical plugging bridge plug for emergency use according to claim 4, wherein: the rubber sleeve compression starting mechanism comprises a lower guide ring (12), a rubber sleeve compression starting shear pin (13), a rubber sleeve seat (14), a lock ring (16) and an upper cone (17); the lower guide ring (12) is sleeved at the lower end of the rubber cylinder seat (14), the upper end of the upper cone (17) is arranged between the lower guide ring (12) and the rubber cylinder seat (14) and is in threaded connection with the inner side wall of the lower end of the lower guide ring (12), the lower end of the upper cone (17) is arranged between the pawl (21) and the slip sleeve (18), and the upper ends of the lower guide ring (12), the rubber cylinder seat (14) and the upper cone (17) are fixed through a rubber cylinder compression starting shear pin (13); the locking ring (16) is arranged between the lower end of the rubber cylinder seat (14) and the upper central tube (5) and is respectively in threaded connection with the lower end of the rubber cylinder seat (14) and the upper central tube (5), and the lower end of the rubber cylinder seat (14) is fixed with the locking ring (16) through a fixing screw (15).
7. The salvageable mechanical plugging bridge plug for emergency use according to claim 4, wherein: the upper guide ring (9) is made of high-strength aluminum alloy material with the tensile strength larger than 480 MPa.
8. A rescue method for salvaging mechanical plugging bridge plug for rescue is characterized by comprising the following steps
The method comprises the following steps: after a puncture and leakage accident happens to a fractured wellhead, when emergency operation is needed to control the dangerous accident, a salvageable mechanical plugging bridge plug (28) for emergency, a bridge plug hydraulic setting tool (29), a safety release (30), a continuous oil pipe connector (31) and a continuous oil pipe (32) are sequentially connected from bottom to top, and the salvageable mechanical plugging bridge plug (28) for emergency is lowered to a preset position by means of the continuous oil pipe (32);
step two: after the first step is finished, performing circulating killing by means of an oil sleeve communication channel of a bridge plug hydraulic setting tool (29), if the dangerous case can be controlled by killing, processing the dangerous case according to a conventional successful killing processing scheme, and if the dangerous case cannot be controlled by killing, performing a third step;
step three: a steel ball (33) is thrown to press and start a bridge plug hydraulic setting tool (29), a salvageable mechanical plugging bridge plug (28) for setting releasing and emergency rescue is used, and underground high pressure is plugged by the salvageable mechanical plugging bridge plug (28) for emergency rescue; in the earlier stage of the setting process of a fishable mechanical plugging bridge plug (28) for emergency, a setting starting shear pin (2) is cut off, a bridge plug hydraulic setting tool (29) pulls a stress lost hand rod (1), an upper central tube (5), a pawl (21), a lower central tube (23), a C-shaped ring (26), a lower joint (27) and a lower cone (25) to move upwards together, so that a slip (19) is gradually spread, after the slip (19) is spread and anchored, a rubber sleeve compression starting shear pin (13) is cut off, and a rubber sleeve (10) starts to be compressed and started and finishes the compression plugging action;
step four: replacing the wellhead damaged by wellhead puncture, and removing wellhead dangerous cases;
step five: the fishing and recovery tool is used for completing the deblocking and fishing of the fishable mechanical plugging bridge plug (28) for underground emergency; after the emergency dangerous situation is relieved, when a tubular column is lifted up by a salvageable mechanical plugging bridge plug (28) for salvage, recovery and rescue, after a recovery starting shear pin (3) is cut off, a recovery joint (4) drives a pressure balance shell (8) to move upwards relative to a pressure balance body (7), an upper pressure balance channel and a lower pressure balance channel of the salvageable mechanical plugging bridge plug (28) for rescue are opened, the upper pressure and the lower pressure of the salvageable mechanical plugging bridge plug (28) for rescue are gradually balanced, and a slip (19) is always kept in an anchoring state in the process; when the pressure above and below the bridge plug is balanced, the slips (19) are gradually retracted to release the anchoring and complete the unsealing action after enough drilling pressure is applied to shear the unsealing shear pin (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242306.3A CN111255412A (en) | 2020-03-31 | 2020-03-31 | Salvageable mechanical plugging bridge plug for emergency and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010242306.3A CN111255412A (en) | 2020-03-31 | 2020-03-31 | Salvageable mechanical plugging bridge plug for emergency and method |
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| CN111255412A true CN111255412A (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010242306.3A Pending CN111255412A (en) | 2020-03-31 | 2020-03-31 | Salvageable mechanical plugging bridge plug for emergency and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608611A (en) * | 2020-06-09 | 2020-09-01 | 中国石油天然气集团有限公司 | Large-drift-diameter bridge plug capable of realizing single upper seal fracturing and method |
| CN112049601A (en) * | 2020-09-30 | 2020-12-08 | 中国石油天然气集团有限公司 | Shaft packing device near wellhead of oil and gas well and using method thereof |
| CN112983339A (en) * | 2021-03-01 | 2021-06-18 | 天津东拓油田技术服务有限公司 | Fishable bridge plug with balancing device |
| CN113073958A (en) * | 2021-03-19 | 2021-07-06 | 中国石油天然气集团有限公司 | Recyclable bridge plug and using method |
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2020
- 2020-03-31 CN CN202010242306.3A patent/CN111255412A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111608611A (en) * | 2020-06-09 | 2020-09-01 | 中国石油天然气集团有限公司 | Large-drift-diameter bridge plug capable of realizing single upper seal fracturing and method |
| CN111608611B (en) * | 2020-06-09 | 2023-10-13 | 中国石油天然气集团有限公司 | Large-diameter bridge plug capable of realizing single-upper-seal fracturing and method |
| CN112049601A (en) * | 2020-09-30 | 2020-12-08 | 中国石油天然气集团有限公司 | Shaft packing device near wellhead of oil and gas well and using method thereof |
| CN112049601B (en) * | 2020-09-30 | 2023-11-17 | 中国石油天然气集团有限公司 | Wellbore packer device at near wellhead of oil and gas well and application method thereof |
| CN112983339A (en) * | 2021-03-01 | 2021-06-18 | 天津东拓油田技术服务有限公司 | Fishable bridge plug with balancing device |
| CN112983339B (en) * | 2021-03-01 | 2022-10-04 | 天津东拓油田技术服务有限公司 | Fishable bridge plug with balancing device |
| CN113073958A (en) * | 2021-03-19 | 2021-07-06 | 中国石油天然气集团有限公司 | Recyclable bridge plug and using method |
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