CN101550811A - Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool - Google Patents
Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool Download PDFInfo
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- CN101550811A CN101550811A CNA2009101070528A CN200910107052A CN101550811A CN 101550811 A CN101550811 A CN 101550811A CN A2009101070528 A CNA2009101070528 A CN A2009101070528A CN 200910107052 A CN200910107052 A CN 200910107052A CN 101550811 A CN101550811 A CN 101550811A
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- combination tool
- positioning seat
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Abstract
The invention proposes a lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool, including: an outer suspension positioning device and a clutch unlock and rotary mechanism, and a unlock card positioning device, wherein, the outer suspension positioning device includes a hoisting cap, a sleeve, a spring, claws, a main positioning seat and a protective plate; the clutch unlocking and rotary mechanism includes a lock card shell, a slide bearing, a thrust bearing, a clutch short pin, a guide closing end, a rotating mandrel and a sealed ring; and the unlock card positioning device includes an unblocking card positioning mandrel. In the non-depth restriction well head cutting combined tool provided by the invention, when the drilling post rotates, the combination tool has a small revolution swinging radius, smooth operating, high operation reliability, high efficiency, saved cost, significant economic benefits. The combination tool will not cause the drill pipe breaking accident, and the combination tool is applicable to shallow and deep-water well-head cutting operation. During ultra-deep water operation, such as in water depth more than 1000 meters, the matching usage of the combination tool and the slurry motor will be more safe and reliable.
Description
Technical field
The present invention relates to offshore oil drilling technique field, particularly a kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool.
Background technology
With Chinese government's regulation, after offshore oil drilling is finished,, must not more than mud line, stay any structure according to an international practice without the approval of national government department.For this reason, except indivedual prospect pits keep outer wellhead through application, all will be recovered to ground to the underwater well head head system from cutting below the mud line after most prospect pit tasks are finished, eliminate legacy on the mud line, this just needs and cuts the recovery instrument under water specially and go operation by special operating personnel.
Usually, when the depth of water is no more than 300 meters, can adopt the way of tradition seat pressure type rotation cutting well head head, the whole drill string of this way cutting tool is a pressurized, riser pipe is freed during the rotation cutting, drill string is that rotation is revolved round the sun again in not having the seawater of circumferential restriction, causes drill string press-bending whipping easily.If at more shallow underwater work, because drill string is not long, whipping half is through not too large, and this method is feasible.But in recent years, intensification along with operating water depth, above 300 meters, or even one km and more than, if continuation is adopted seat pressure type cutting well head head then is easy to take place the excessive cutter poor stability that causes of whipping radius, unbalance stress is difficult for cutting, the accident of the excessive drill string that also fractures easily of while whipping radius, even meeting can't operation because ocean current influences.
Above-mentioned prior art cutting is shifted easily during cutting and cuts partially because cutting tool and well head do not have mutual self-locking or location, causes lengthening clipping time, and production efficiency is low.
Summary of the invention
The objective of the invention is, the defective that exists at above-mentioned prior art provides a kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool, and during drill string rotating, its revolution whipping radius is little, and operation is steady, the operational reliability height.
Technical scheme of the present invention is as follows:
A kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool comprises: outer suspension positioning mechanism and clutch unlocking and rotating mechanism, wherein:
Described outer suspension positioning mechanism comprises: lifting appliance, claw, main body positioning seat, wherein said lifting appliance is installed on the described main body positioning seat, described claw is rotating to be connected on the described main body positioning seat, and an end of described claw is connected by first spring with described lifting appliance;
Described clutch unlocking and rotating mechanism comprise: pintle hook lock housing, sliding bearing, axis of rotation core, described axis of rotation core is packed in the described sliding bearing, described sliding bearing is packed in the described pintle hook lock housing, described axis of rotation core is provided with the protrusion shoulder, one side of described shoulder and described pintle hook lock housing are provided with along second spring of described axis of rotation core centerline direction, one guiding end socket is fixedlyed connected with a port of described pintle hook lock housing, but being connected of the inner face clutch of the opposite side of described shoulder and described guiding end socket;
The outer wall of described pintle hook lock housing is provided with the buckle key, and described main body positioning seat inwall is provided with buckle slot, and described outer suspension positioning mechanism and described clutch unlocking and rotating mechanism are by described buckle slot buckle key and lockable the connection.
Wherein, be equiped with backplate on the inwall of described main body positioning seat.
Wherein, described claw is 7 fonts, the corner of described claw is by in the rotating groove that is installed in described main body positioning seat of a bearing pin, the end face of described claw is provided with spring eye, described lifting appliance is provided with spring groove, one end of described first spring is packed in the described spring groove, and the other end of described spring is packed in the described spring eye.
Wherein, described main body positioning seat inwall is provided with buckle slot, specifically comprises: described main body positioning seat inwall is provided with vertical buckle vertical slot and horizontal buckle translot.
Wherein, be connected by spacer between described lifting appliance and the described main body positioning seat.
Wherein, described claw is three.
Wherein, be equiped with thrust bearing between a side of described shoulder and the described pintle hook lock housing, a side of described thrust bearing and described shoulder is equiped with second spring.
Wherein, the pintle hook lock housing is provided with oil filler point.
Wherein, but being connected of the inner face clutch of the opposite side of described shoulder and described guiding end socket; Specifically comprise: described guiding end socket inner face is provided with the short pin of clutch, and the opposite side of described shoulder is provided with the clutch tooth, but being connected of the short pin of described clutch and the clutch of described clutch tooth.
Wherein, the upper surface of described axis of rotation core is provided with male thread or box thread, mandrel lower end, one location is provided with box thread or male thread, and described positioning core axle is by the described upper end of described axis of rotation core of packing into that is threaded, and described positioning core axle is provided with locating shoulder.
Beneficial effect of the present invention is: a kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool provided by the invention, clutch unlocking and rotating mechanism, outer suspension positioning mechanism is conciliate the pintle hook lock positioning core axle and is used, the outer suspension positioning mechanism card hangs on the underwater wellhead, during drill string rotating, its revolution whipping radius is little, and operation is steady, can not cause the drilling rod accident that fractures.Three claw distributions triangular in shape of outer suspension positioning mechanism meet stability principle, simultaneously three claws of outer suspension positioning mechanism hold on to well head outer suspension positioning mechanism and well head are combined into one during cutting operation, automatic location and lateral support function are provided, but cutter steadily cuts with regard to the automatic centering well head like this, well head system is tension state during cutting operation, well head is difficult for toppling over when cutting off, can know intuitively that from the variation of weight indicator suspending weight whether the well head head cuts off, so operational reliability height, high efficiency, save cost, remarkable in economical benefits.And this combination tool is applicable to shallow water and deep water well head cutting operation.
Description of drawings
Fig. 1 is the decomposing schematic representation of a kind of outer suspension positioning mechanism provided by the invention;
Fig. 2 is the assembling schematic diagram of a kind of clutch unlocking provided by the invention and rotating mechanism;
Fig. 3 is the assembling schematic diagram of a kind of deep water well head cutting combination tool provided by the invention.
The specific embodiment
The invention provides a kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool, for making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
As Fig. 1, Fig. 2, shown in Figure 3, for realize steadily, high reliability and high efficiency deep water well head cutting operation, can not cause the drilling rod accident that fractures, a kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool that the embodiment of the invention provides, comprise: outer suspension positioning mechanism, clutch unlocking and rotating mechanism are conciliate the pintle hook lock positioning core axle, wherein:
Described outer suspension positioning mechanism A comprises: lifting appliance 103, claw 106, main body positioning seat 108, wherein said lifting appliance 103 is installed on the described main body positioning seat 108, this lifting appliance 103 is used for this combination tool is mentioned, this lifting appliance 103 be in the present embodiment the cross section be the cap shape, above it and following for columniform lifting cap, the center of the top and bottom of this lifting cap is provided with central shaft hole, be provided with above it and buckle parts, combination tool can be raised up to make things convenient for the device on the production platform.
This main body positioning seat 108 is cylindrical, and its axial centre is provided with circular hole, and described main body positioning seat 108 inwalls are provided with buckle slot, specifically comprise: described main body positioning seat 108 inwalls are provided with vertical buckle vertical slot 131 and horizontal buckle translot 132.This vertical buckle vertical slot 131 is the protruding keys that are used for passing clutch unlocking and rotating mechanism B, should forward in the buckle translot 132 by protruding key by rotating then, and clutch unlocking and rotating mechanism B and outer suspension positioning mechanism A are locked together.
This lifting appliance 103 is installed on the described main body positioning seat 108, is connected by spacer 104 between described in the present embodiment lifting appliance 103 and the described main body positioning seat 108.Also can be fixedly connected in other way, this spacer 104 is six, perhaps more, still less individual, between spacer 104 can be welded on above the following and main body positioning seat 108 of lifting appliance 103, the space that has spacer 104 length between described lifting appliance 103 and the described main body positioning seat 108, lifting means on the production platform can buckle in this space, and combination tool and other equipment are put on.Also can fixedly connected in other way between described lifting appliance 103 and the described main body positioning seat 108, have the parts that buckle that promote usefulness to get final product on the lifting appliance 103.
Described claw 106 rotating being connected on the described main body positioning seat 108 can be preferred, and described claw 106 is three because form leg-of-mutton fixing the most stable, in other embodiments, also can be for more than three or be less than three.One end of described claw 106 is connected by first spring 105 with described lifting appliance 103; In the present embodiment, described claw 106 is 7 fonts, the corner of described claw 106 is by in the rotating groove that is installed in described main body positioning seat 108 of a bearing pin 107, the end face of described claw 106 is provided with spring eye, described lifting appliance 103 is provided with spring groove, one end of described first spring 105 is packed in the described spring groove, and the other end of described spring is packed in the described spring eye.Described claw 106 opens it by the elasticity of spring, when having object to press the upper end inner face of claw 106 claw 106 is pushed to the center.The lower end inner face of this claw 106 is provided with the alveolus that is used for blocking the well head wall.
Described clutch unlocking and rotating mechanism B comprise: pintle hook lock housing 111, sliding bearing 113, axis of rotation core 125, described axis of rotation core 125 is packed in the described sliding bearing 113, described sliding bearing 113 is packed in the described pintle hook lock housing 111, described axis of rotation core 125 is provided with the protrusion shoulder, one side of described shoulder and described pintle hook lock housing 111 are provided with second spring 118 along described axis of rotation core 125 centerline directions, one guiding end socket 123 is fixedlyed connected with a port of described pintle hook lock housing 111, but being connected of the inner face clutch of the opposite side of described shoulder and described guiding end socket 123; In the present embodiment, be equiped with thrust bearing 115 between a side of described shoulder and the described pintle hook lock housing 111, described thrust bearing 115 is equiped with second spring 118 with a side of described shoulder.One end of second spring 118 can be installed on the shoulder of axis of rotation core 125 by a spring base 119.
The outer wall of described pintle hook lock housing 111 is provided with protruding key, and described main body positioning seat 108 inwalls are provided with buckle slot, and described outer suspension positioning mechanism A and described clutch unlocking and rotating mechanism B are by described buckle slot buckle and lockable the connection.Wherein, in the present embodiment, but being connected of the inner face clutch of the opposite side of described shoulder and described guiding end socket 123; Specifically comprise: described guiding end socket 123 inner faces are provided with the short pin of clutch, and the opposite side of described shoulder is provided with the clutch tooth, but being connected of the short pin of described clutch and the clutch of described clutch tooth.
In a further embodiment, in order to prevent that this main body positioning seat 108 from being broken the inwall of main body positioning seat 108 by the borehole wall in the well head of packing into, be equiped with backplate on the inwall of described main body positioning seat 108, this backplate is attached to the inwall of this main body positioning seat 108, is installed in the inwall of this main body positioning seat 108 by screw.This backplate is a soft material, and this protected apron 110 can be consumable accessory, can be after wearing and tearing in time changes, and main body positioning seat 108 and well head is played the effect of protection.
In a further embodiment, for can the rotatable parts that make this combination tool be lubricated, pintle hook lock housing 111 is provided with oil filler point, being used for oiling, if when not using, and then can be by stopping up stifled this oil filler point of going up.
In addition, in a further embodiment, the upper surface of described axis of rotation core 125 is provided with male thread or box thread, mandrel C lower end, one location is provided with box thread or male thread, described positioning core axle C is by the described upper end of described axis of rotation core 125 of packing into that is threaded, and described positioning core axle C is provided with locating shoulder.After outer suspension positioning mechanism A and clutch unlocking and rotating mechanism B release, this clutch unlocking and rotating mechanism B drop to this locating shoulder position and just can not descend again, are convenient to operation.
The concrete assembling process of this non-depth of water restriction well head cutting combination tool that the embodiment of the invention provides is:
Outer suspension positioning mechanism A assembling process: at first three protected aprons 110 are respectively charged into three place's correspondence positions of main body positioning seat 108, and itself and main body positioning seat 108 are fixed together with bolt 109.Then three bearing pins 107 are put into the pin-and-hole of claw 106 respectively, be respectively charged in three grooves of main body positioning seat 108 then.Afterwards spring 105 is packed in the spring eye of claw 106, again spacer 104 and lifting cap 103 are installed to respectively on the main body positioning seat 108, and will promote cap 103 and main body positioning seat 108 is fixed into one with bolt 101 and 102, promptly finished the assembling of outer suspension positioning mechanism A.
Disengaging type clutch unlocking and rotating mechanism B assembling process: the pintle hook lock housing 111 and fastening of at first sliding bearing 113 being packed into screw 114, the pintle hook lock housing 111 of again sealing ring 112 being packed into, simultaneously with spring base 119 and second spring 118 and plain thrust bearing 115 successively from the box end rotation mandrel 125 of packing into, again with the pintle hook lock housing 111 that installs from the box end rotation mandrel 125 of packing into.In addition on-of pin 121 and sealing ring 120 and sealing ring 124 are respectively charged into guiding end socket 123, and then the end socket 123 that will lead is from pack into rotation mandrel 125 and itself and pintle hook lock housing 111 are fixed together with bolt 122 of pin end, and the pintle hook lock housing 111 of at last bonded washer 116 and obstruction 117 being packed into is finished assembling.
The operating principle of this lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool that the embodiment of the invention provides is:
When carrying out cutting operation in the down-hole, this combination tool is used by outer suspension positioning mechanism A and disengaging type clutch unlocking and rotating mechanism B and release fastening position mandrel C three parts, when carrying out the underwater wellhead cutting operation, disengaging type clutch unlocking and rotating mechanism B are passed outer suspension positioning mechanism A centre bore from the bottom to top to be connected with release fastening position, top mandrel C, at disengaging type clutch unlocking and rotating mechanism B lower end installing centralizer and cutting tool, release fastening position mandrel C top box stacks also is connected with the platform drive unit, as shown in Figure 3.During operation instrument is lowered to the seabed, cutter and disengaging type clutch unlocking and rotating mechanism B etc. enter in the well head 126, till sitting on the well head to outer suspension positioning mechanism A, because its claw 106 is subjected to the effect of spring 105 under free state, be open, so be easy to outer suspension positioning mechanism A is sat on the well head, at this moment drilling rod is slowly rotated to an angle counterclockwise and make the buckle vertical slot 131 of the protruding key of pintle hook lock housing 111 last outer suspension positioning mechanism A, drilling rod being carried on slowly makes protruding key enter buckle vertical slot 131 the insides again, on below continuation lifting drilling rod to pintle hook lock housing 111 upper surfaces are pressed onto in the claw 106, at this moment three claws 106 be subjected to active force will be around its bearing pin 107 angle that turns clockwise, claw 106 is tightened well head, at this moment the certain angle that drilling rod turned clockwise screws in the main body positioning seat 108 buckle translots 132 the protruding key of pintle hook lock housing 111, clutch unlocking and rotating mechanism B and outer suspension positioning mechanism A are locked together, drilling rod continues upwards pretension, overcome the clutch spring power of disengaging type clutch unlocking and rotating mechanism B the inside, clutch breaks away from, and next just can carry out cutting operation.Operation is just fairly simple when needing unfreezing, only with the pretension of removing drilling rod, be rotated counterclockwise certain angle, at this moment owing to removed pretension, second spring 118 in disengaging type clutch unlocking and the rotating mechanism B has lost the external force influence, second spring 118 resets, clutch 121 combinations, and pintle hook lock housing 111 has just also rotated an angle with drilling rod.Slowly moving down drilling rod again makes the protruding key of pintle hook lock housing 111 from main body positioning seat 108 buckle slots (buckle vertical slot 131, buckle translot 132) deviates from, an angle then turns clockwise, carry on slowly again, at this moment the protruding key of pintle hook lock housing 111 has just pushed up on the main body positioning seat 108 interior lower surfaces, simultaneously because three claws 106 of outer suspension positioning mechanism A have lost external force, just open with well head automatically and break away from, promptly be to open automatically, because at this moment claw 106 is in free state, do not have self-lock ability, continue to promote the drilling rod combination tool and just can from well head, withdraw.
The lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool that outer suspension positioning mechanism that the embodiment of the invention provides and clutch unlocking and rotating mechanism and release fastening position mandrel are formed has following characteristics:
1, this combination tool is used in shallow water and deep water well head cutting operation.
2, this combination tool adopts plug-in well head, and drilling rod bears pulling force all the time in the cutting operation process, and when drill string rotating, its revolution whipping radius is much smaller, and operation is many stably, thereby has guaranteed the reliability of deep water well head cutting operation.
3, since adopt plug-in, reliable operation, can in tradition, not drag for lance often occur grabbing tight, can not move back even the phenomenon of damage well head head.
4, can prevent in the operation process that the well head head is along with cutter rotates.
Well head also is a tension state during 5, owing to cutting, the well head inclination can not occur often causing and influence cutting operation as the conventional pressurized cutting operation.
6, three of outer suspension positioning mechanism A claw distributions triangular in shape meet stability principle, simultaneously three claws of outer hanger hold on to well head outer suspension positioning mechanism A and well head are combined into one during cutting operation, automatic location and lateral support function are provided, but cutter steadily cuts with regard to the automatic centering well head like this, and the tradition cutting is not because cutting tool and well head have mutual self-locking or location, be shifted easily during cutting and cut partially, cause lengthening clipping time.
7, well head system is tension state during cutting operation, easily topples over when cutting off not can be as pressurized the time well head, and can intuitively whether know cut-out from the variation of weight indicator suspending weight.
8, owing to this combination tool design and use advantage, operating efficiency and reliability are all far above traditional cutting operation.
9, this combination tool can be used as well head and is lowered to the instrument use.
10, this combination tool can once be finished cementing, cutting, the three-in-one job task of salvaging, and this will increase work efficiency greatly, saves great amount of cost, remarkable in economical benefits.
11, during super deepwater work (such as surpassing 1000 meters deep water), combination tool top can directly connect MTR, and motor output shaft drives the bottom cutting tool and rotates in the operation process, and drilling rod can not rotate, and has more improved the reliability of operation.
It should be noted that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1, a kind of lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool is characterized in that, comprising: outer suspension positioning mechanism and clutch unlocking and rotating mechanism, wherein:
Described outer suspension positioning mechanism comprises: lifting appliance, claw, main body positioning seat, wherein said lifting appliance is installed on the described main body positioning seat, described claw is rotating to be connected on the described main body positioning seat, and an end of described claw is connected by first spring with described lifting appliance;
Described clutch unlocking and rotating mechanism comprise: pintle hook lock housing, sliding bearing, axis of rotation core, described axis of rotation core is packed in the described sliding bearing, described sliding bearing is packed in the described pintle hook lock housing, described axis of rotation core is provided with the protrusion shoulder, one side of described shoulder and described pintle hook lock housing are provided with along second spring of described axis of rotation core centerline direction, one guiding end socket is fixedlyed connected with a port of described pintle hook lock housing, but being connected of the inner face clutch of the opposite side of described shoulder and described guiding end socket;
The outer wall of described pintle hook lock housing is provided with the buckle key, and described main body positioning seat inwall is provided with buckle slot, and described outer suspension positioning mechanism and described clutch unlocking and rotating mechanism are by described buckle slot buckle key and lockable the connection.
2, combination tool according to claim 1 is characterized in that, is equiped with backplate on the inwall of described main body positioning seat.
3, combination tool according to claim 1, it is characterized in that, described claw is 7 fonts, the corner of described claw is by in the rotating groove that is installed in described main body positioning seat of a bearing pin, the end face of described claw is provided with spring eye, described lifting appliance is provided with spring groove, and an end of described first spring is packed in the described spring groove, and the other end of described spring is packed in the described spring eye.
4, combination tool according to claim 1, it is characterized in that described main body positioning seat inwall is provided with buckle slot, specifically comprises: described main body positioning seat inwall is provided with vertical buckle vertical slot and horizontal buckle translot.
5, combination tool according to claim 1 is characterized in that, is connected by spacer between described lifting appliance and the described main body positioning seat.
6, combination tool according to claim 1 is characterized in that described claw is three, also can be greater or less than three.
7, combination tool according to claim 1 is characterized in that be equiped with thrust bearing between a side of described shoulder and the described pintle hook lock housing, a side of described thrust bearing and described shoulder is equiped with second spring.
8, combination tool according to claim 1 is characterized in that the pintle hook lock housing is provided with oil filler point.
9, combination tool according to claim 1 is characterized in that, but being connected of the inner face clutch of the opposite side of described shoulder and described guiding end socket; Specifically comprise: described guiding end socket inner face is provided with the short pin of clutch, and the opposite side of described shoulder is provided with the clutch tooth, but being connected of the short pin of described clutch and the clutch of described clutch tooth.
10, combination tool according to claim 1, it is characterized in that, also comprise: release fastening position mandrel, the upper surface of described axis of rotation core is provided with male thread or box thread, described positioning core axle lower end is provided with box thread or male thread, described positioning core axle is by the described upper end of described axis of rotation core of packing into that is threaded, and described positioning core axle is provided with locating shoulder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101070528A CN101550811B (en) | 2009-05-08 | 2009-05-08 | Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101070528A CN101550811B (en) | 2009-05-08 | 2009-05-08 | Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool |
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| CN101550811A true CN101550811A (en) | 2009-10-07 |
| CN101550811B CN101550811B (en) | 2010-06-02 |
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| CN2009101070528A Active CN101550811B (en) | 2009-05-08 | 2009-05-08 | Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool |
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| CN101798911A (en) * | 2010-03-10 | 2010-08-11 | 中国石油天然气集团公司 | Underwater wellhead reclaiming tool |
| CN102080511B (en) * | 2011-01-05 | 2013-03-20 | 深圳市远东石油钻采工程有限公司 | Deepwater abandoned well cutting device having cementing plug and operation method of cementing plug thereof |
| CN102080512A (en) * | 2011-01-05 | 2011-06-01 | 深圳市远东石油钻采工程有限公司 | Multiposition one-way bypass connection structure for deep-water abandoned well cutting device |
| CN102080511A (en) * | 2011-01-05 | 2011-06-01 | 深圳市远东石油钻采工程有限公司 | Deepwater abandoned well cutting device having cementing plug and operation method of cementing plug thereof |
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| CN110541673A (en) * | 2019-09-24 | 2019-12-06 | 重庆科技学院 | Releasable multi-branch fishbone drilling connecting tool |
| CN111691842A (en) * | 2020-06-19 | 2020-09-22 | 中国石油大学(华东) | Cutting and fishing method |
| CN111894505A (en) * | 2020-07-28 | 2020-11-06 | 吕梁学院 | Downhole operation wide area search detection fishing equipment |
| CN113309466A (en) * | 2021-07-30 | 2021-08-27 | 山东辛丁技术有限公司 | Deep sea oil drilling and production equipment |
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