CN101550810B - Outer suspension positioning mechanism of an underwater cutting tool - Google Patents

Abstract

The present invention proposes an outer suspension positioning mechanism of an underwater cutting tool, including: a lifting equipment, a claw, a main body positioning seat, wherein, the lifting equipment is mounted on the main body positioning seat, the claw can be rotarily connected on the main body positioning seat, one end of the claw is connected to the lifting equipment through a first spring, and the inner wall of the main body positioning seat is provided with a clip groove. The outer suspension positioning mechanism and the clutch locking and rotating mechanism are assembled into a combination tool. 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.

Description

A kind of outer suspension positioning mechanism of underwater cutting tool

Technical field

The present invention relates to offshore oil drilling technique field, particularly a kind of outer suspension positioning mechanism of underwater cutting tool.

Background technology

With Chinese government's regulation, after offshore oil drilling is accomplished,, 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 accomplished, 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, and 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, along with the intensification of operating water depth, above 300 meters; Or even one km and more than, if continue to adopt seat pressure type cutting well head head then to be easy to take place the whipping radius excessive, cause the cutter poor stability; Unbalance stress; Difficult 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 to above-mentioned prior art provides a kind of outer suspension positioning mechanism of underwater cutting tool, and during drill string rotating, its revolution whipping radius is little, and operation is steady, and operational reliability is high.

Technical scheme of the present invention is following:

A kind of outer suspension positioning mechanism; Comprise: lifting appliance, claw, main body positioning seat; Wherein said lifting appliance is installed on the said main body positioning seat; Said claw is rotating to be connected on the said main body positioning seat, and an end of said claw is connected through first spring with said lifting appliance, and said main body positioning seat inwall is provided with buckle slot.

Wherein, be equiped with backplate on the inwall of said main body positioning seat.

Wherein, Said claw is 7 fonts; The corner of said claw is through in the rotating groove that is installed in said main body positioning seat of a bearing pin, and the end face of said claw is provided with spring eye, and said lifting appliance is provided with spring groove; One end of said first spring is packed in the said spring groove, and the other end of said spring is packed in the said spring eye.

Wherein, said main body positioning seat inwall is provided with buckle slot, specifically comprises: said main body positioning seat inwall is provided with vertical buckle vertical slot and horizontal buckle translot.

Wherein, be connected through spacer between said lifting appliance and the said main body positioning seat.

Wherein, said claw is three.

Beneficial effect of the present invention is: the outer suspension positioning mechanism of a kind of underwater cutting tool provided by the invention; Conciliating the pintle hook lock detent mechanism with clutch unlocking and rotating mechanism is used; This outer suspension positioning mechanism card hangs on the underwater wellhead, is in tension state during drill string rotating, and its revolution whipping radius is little; 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, and 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, and 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, and well head is difficult for toppling over when cutting off, and can know intuitively that from the variation of weight indicator suspending weight whether the well head head cuts off; Therefore operational reliability is high; High efficiency is practiced thrift 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 sketch map of a kind of clutch unlocking provided by the invention and rotating mechanism;

Fig. 3 is the assembling sketch map of a kind of underwater cutting tool provided by the invention.

The specific embodiment

The invention provides a kind of outer suspension positioning mechanism of underwater cutting tool, clearer, clear and definite for making the object of the invention, technical scheme and advantage, below develop simultaneously embodiment to further explain of the present invention with reference to accompanying drawing.

Like 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, the outer suspension positioning mechanism of a kind of underwater cutting tool that the embodiment of the invention provides, wherein; This underwater cutting tool comprises: outer suspension positioning mechanism A, clutch unlocking and rotating mechanism B conciliate pintle hook lock positioning core axle C, wherein:

Said outer suspension positioning mechanism A comprises:lifting appliance 103,claw 106, mainbody positioning seat 108; Wherein saidlifting appliance 103 is installed on the said mainbody positioning seat 108; Thislifting appliance 103 is used for this combination tool is mentioned; Thislifting 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, is provided with above it to buckle parts, can combination tool be raised up to make things convenient for the device on the production platform.

This mainbody positioning seat 108 is cylindrical, and its axial centre is provided with circular hole, and said mainbody positioning seat 108 inwalls are provided with buckle slot, specifically comprise: said mainbody positioning seat 108 inwalls are provided with vertical bucklevertical slot 131 and horizontal buckle translot 132.This vertical bucklevertical slot 131 is the protruding keys that are used for passing clutch unlocking and rotating mechanism B, should forward in thebuckle translot 132 by protruding key through rotating then, and clutch unlocking and rotating mechanism B and outer suspension positioning mechanism A are locked together.

Thislifting appliance 103 is installed on the said mainbody positioning seat 108, is connected throughspacer 104 between said in the presentembodiment lifting appliance 103 and the said main body positioning seat 108.Also can be fixedly connected through other mode; Thisspacer 104 is three; Perhaps more, still less, betweenspacer 104 can be welded on above the following and mainbody positioning seat 108 oflifting appliance 103, the space that has spacer 104 length between saidlifting appliance 103 and the said mainbody 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 be fixedly connected between saidlifting appliance 103 and the said mainbody positioning seat 108, the parts that buckle that promote usefulness are arranged on thelifting appliance 103 through other mode.

Saidclaw 106 rotating being connected on the said mainbody positioning seat 108 can be preferred, and saidclaw 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 saidclaw 106 is connected throughfirst spring 105 with saidlifting appliance 103; In the present embodiment; Said claw 106 is 7 fonts; The corner of saidclaw 106 is through in the rotating groove that is installed in said mainbody positioning seat 108 of abearing pin 107, and the end face of saidclaw 106 is provided with spring eye, and said liftingappliance 103 is provided with spring groove; One end of saidfirst spring 105 is packed in the said spring groove, and the other end of said spring is packed in the said spring eye.Said claw 106 opens it through the elasticity of spring, when having object to press the upper end inner face ofclaw 106,claw 106 is pushed to the center.The lower end inner face of thisclaw 106 is provided with the alveolus that is used for blocking the well head wall.

Said clutch unlocking and rotating mechanism B comprise: pintlehook lock housing 111, sliding bearing 113, axis of rotation core 125; Said axis of rotation core 125 is packed in the said sliding bearing 113; Said sliding bearing 113 is packed in the said pintlehook lock housing 111; Said axis of rotation core 125 is provided with the protrusion shoulder; One side of said shoulder and said pintlehook lock housing 111 are provided with along second spring 118, the guidingend sockets 123 of said axis of rotation core 125 centerline directions and are fixedly connected with a port of said pintlehook lock housing 111, but being connected of the inner face clutch of the opposite side of said shoulder and said guidingend socket 123; In the present embodiment, be equiped with thrust bearing 115 between a side of said shoulder and the said pintlehook lock housing 111, said thrust bearing 115 is equiped with second spring 118 with a side of said shoulder.One end of second spring 118 can be installed on axis of rotation core 125 shoulders through a spring base 119.

The outer wall of said pintlehook lock housing 111 is provided with protruding key, and said mainbody positioning seat 108 inwalls are provided with buckle slot, and said outer suspension positioning mechanism A and said clutch unlocking and rotating mechanism B are through said 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 said shoulder and said guidingend socket 123; Specifically comprise: said guidingend socket 123 inner faces are provided with the short pin of clutch, and the opposite side of said shoulder is provided with the clutch tooth, but being connected of the short pin of said clutch and the clutch of said clutch tooth.

In a further embodiment; In order to prevent that this mainbody positioning seat 108 from being broken the inwall of mainbody positioning seat 108 by the borehole wall in the well head of packing into; Be equiped with backplate on the inwall of said mainbody positioning seat 108; This backplate is attached to the inwall of this mainbody positioning seat 108, is installed in the inwall of this mainbody positioning seat 108 through screw.This backplate is a soft material, and this protectedapron 110 can be consumable accessory, can be after wearing and tearing in time changes, and mainbody 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, pintlehook lock housing 111 is provided with oil filler point, being used for oiling, if when not using, and then can be through stopping up stifled this oil filler point of going up.

In addition; In a further embodiment; The upper surface of said axis of rotation core 125 is provided with male thread or box thread; Positioning core axle C lower end is provided with box thread or male thread, and said positioning core axle C connects the upper end of the said axis of rotation core 125 of packing into through said box thread or male thread, and said 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 underwater cutting tool that the embodiment of the invention provides is:

Outer suspension positioning mechanism A assembling process: at first three protectedaprons 110 are respectively charged into three place's correspondence positions of mainbody positioning seat 108, and itself and mainbody positioning seat 108 are fixed together with bolt 109.Then three bearingpins 107 are put into the pin-and-hole ofclaw 106 respectively, be respectively charged in three grooves of mainbody positioning seat 108 then.Afterwardsspring 105 is packed in the spring eye ofclaw 106; Againspacer 104 and liftingcap 103 are installed to respectively on the mainbody positioning seat 108; And will promotecap 103 withbolt 101 and 102 and be fixed into one with mainbody positioning seat 108, promptly accomplished the assembling of outer suspension positioning mechanism A.

Disengaging type clutch unlocking and rotating mechanism B assembling process: at first with the sliding bearing 113 pintlehook lock housing 111 and fastening of packing into screw 114; Again with the sealingring 112 pintlehook lock housing 111 of packing 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 pintlehook lock housing 111 that installs from the box end rotation mandrel 125 of packing into.In addition on-ofpin 121 and sealing ring 124 and sealingring 120 are respectively charged into guidingend socket 123; And then theend socket 123 that will lead is from pack into rotation mandrel 125 and itself and pintlehook lock housing 111 are fixed together withbolt 122 of pin end, at last with bonded washer 116 with stop up the 117 pintlehook lock housings 111 of packing into and accomplish and assemble.

The operating principle of this underwater cutting tool that the embodiment of the invention provides is:

When carrying out cutting operation in the down-hole; This cutting tool is conciliate pintle hook lock positioning core axle C three parts by outer suspension positioning mechanism A, disengaging type clutch unlocking and rotating mechanism B and is used; When carrying out the underwater wellhead cutting operation, release fastening position mandrel C is passed outer suspension positioning mechanism A and disengaging type clutch unlocking and rotating mechanism B by being threaded, at disengaging type clutch unlocking and rotating mechanism B lower end installing centralizer and cutting tool; Rotation mandrel 125 passes from the hole of outer suspension positioning mechanism A lower end; Rotation mandrel 125 top screw threads meet release fastening position mandrel C, and mandrel C upper end stacks in release fastening position also is connected with the platform drive unit, and is as shown in Figure 3.During operation instrument is lowered to the seabed; Cutter and disengaging type clutch unlocking and rotating mechanism B etc. get in the well head; Till sitting on the well head,, be open because itsclaw 106 receives the effect ofspring 105 under free state to outer suspension positioning mechanism A; So be easy to outer suspension positioning mechanism A is sat on the well head; At this moment the drilling rod inhour is slowly rotated to an angle and makes the bucklevertical slot 131 of the protruding key of pintlehook lock housing 111, drilling rod is carried on slowly made protruding key get into bucklevertical slot 131 the insides again last outer suspension positioning mechanism A, continue to promote drilling rod to pintlehook lock housing 111 upper surfaces be pressed onto in theclaw 106 below on; At this moment threeclaws 106 receive active force will be around itsbearing pin 107 angle that turns clockwise; Makeclaw 106 with well head chucking, at this moment the protruding key of pintlehook lock housing 111 is screwed in thebuckle translot 132 of mainbody positioning seat 108 the drilling rod certain angle that turns clockwise, clutch unlocking and rotating mechanism B and outer suspension positioning mechanism A are locked together.Continue 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, inhour rotates to an 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, andclutch 121 combines, and pintlehook lock housing 111 has just also rotated an angle with drilling rod.Slowly moving down drilling rod again deviates from the protruding key of pintlehook lock housing 111 from mainbody positioning seat 108 buckle slots (bucklevertical slot 131, buckle translot 132); The angle that turns clockwise is then carried on slowly again, and the protruding key of pintlehook lock housing 111 has just been pushed up in the mainbody positioning seat 108 on the lower surfaces; Simultaneously because threeclaws 106 of outer suspension positioning mechanism A have lost external force; Just opening automatically and the well head disengaging, promptly is to open automatically, because at thismoment 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 from.

The underwater cutting 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 little, 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 as the conventional pressurized cutting operation, often causing and influence 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 cuts steadily 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, and well head is prone to topple over can be as pressurized the time when cutting off not, 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 accomplished cementing, cutting, the three-in-one job task of salvaging, and this will increase work efficiency greatly, practices thrift great amount of cost, remarkable in economical benefits.

11, during ultra 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.

What should explain is; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (4)

1. the outer suspension positioning mechanism of a underwater cutting tool; It is characterized in that; Comprise: lifting appliance, claw, main body positioning seat, wherein said lifting appliance are installed on the said main body positioning seat, and said claw is rotating to be connected on the said main body positioning seat; One end of said claw is connected through first spring with said lifting appliance, and said main body positioning seat inwall is provided with buckle slot;

Said claw is 7 fonts; The corner of said claw is through in the rotating groove that is installed in said main body positioning seat of a bearing pin; The end face of said claw is provided with spring groove; Said lifting appliance is provided with spring eye, and an end of said first spring is packed in the said spring groove, and the other end of said spring is packed in the said spring eye;

Be connected through spacer between said lifting appliance and the said main body positioning seat;

The lower end inner face of said claw is provided with the alveolus that is used for blocking the well head wall.

2. outer suspension positioning mechanism according to claim 1 is characterized in that, is equiped with backplate on the inwall of said main body positioning seat.

3. outer suspension positioning mechanism according to claim 1, it is characterized in that said main body positioning seat inwall is provided with buckle slot, specifically comprises: said main body positioning seat inwall is provided with vertical buckle vertical slot and horizontal buckle translot.

4. outer suspension positioning mechanism according to claim 1 is characterized in that said claw is three.

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