CN106121575A - Flexible coring tool - Google Patents

Flexible coring tool Download PDF

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Publication number
CN106121575A
CN106121575A CN201610649752.XA CN201610649752A CN106121575A CN 106121575 A CN106121575 A CN 106121575A CN 201610649752 A CN201610649752 A CN 201610649752A CN 106121575 A CN106121575 A CN 106121575A
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CN
China
Prior art keywords
core
flexible
ball
socket
bulb
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610649752.XA
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Chinese (zh)
Other versions
CN106121575B (en
Inventor
孙强
刘合
李涛
李益良
张绍林
明尔扬
黄守志
韩伟业
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
China Petroleum and Natural Gas Co Ltd
Original Assignee
China Petroleum and Natural Gas Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Petroleum and Natural Gas Co Ltd filed Critical China Petroleum and Natural Gas Co Ltd
Priority to CN201610649752.XA priority Critical patent/CN106121575B/en
Publication of CN106121575A publication Critical patent/CN106121575A/en
Application granted granted Critical
Publication of CN106121575B publication Critical patent/CN106121575B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors
    • E21B25/06Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors the core receiver having a flexible liner or inflatable retaining means
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02Couplings; joints
    • E21B17/04Couplings; joints between rod or the like and bit or between rod and rod or the like

Abstract

Disclosure one flexibility coring tool, including: the core bit mechanism being sequentially connected with, flexible urceolus;It is equipped with rock core inner core in described flexible urceolus;The front end of described rock core inner core is provided with hitch;Described hitch by the front support of described rock core inner core in described core bit mechanism;The rear end of described rock core inner core is provided with the righting mechanism of its righting.Described flexible urceolus includes the flexible nipple that the first tool joint, the second tool joint and the multiple head and the tail between described first tool joint with described second tool joint are connected;Described flexible urceolus connects described core bit mechanism by described first tool joint.

Description

Flexible coring tool
Technical field
The application relates to In Oil Field Exploration And Development field, particularly relates to a kind of flexible coring tool.
Background technology
In Oil Field Exploration And Development needs accurately to obtain the important geologic information such as oil reservoir initial oil saturation and formation porosity, To formulate rational exploration and development scheme.Mid-late oilfield development, needs to check flood effectiveness, the profit of quantitative analysis oil reservoir moves State, waterflooded reservoir situation and water drive oil effect, to make effective enhancing efficiency by relying on tapping internal latent power well stimulation, improve development plan.Core And core analysis is as obtaining one of oil gas data, the understanding the most direct and topmost method of reservoir, can be that development plan is formulated Important evidence is provided with adjusting.
According to purpose and the operating type of coring, drilling and coring delivery can be divided into routine to core and special core.Sealing core drilling belongs to Special core, refer to use hermetic core taking tool and sealing fluid, take out under the conditions of water-base drilling fluid be little affected by drilling fluid from The rock core polluted by water.
Conventional hermetic core taking tool size is relatively big, when coring in horizontal well drilling wants well track and drilling quality etc. Ask higher.
The various horizontal well hermetic core taking tools used at present all cannot be at the sidetracking radius ultra-short radius water less than 3m Horizontal well or high angle hole use, it is impossible to realize fixed point orientation and core.
Summary of the invention
The technical problem to be solved is to provide a kind of flexible coring tool, to be applicable to super short radius The work of coring of horizontal well.
For reaching above-mentioned purpose, the application provides a kind of flexible coring tool, including: the core bit machine being sequentially connected with Structure, flexible urceolus;It is equipped with rock core inner core in described flexible urceolus;The front end of described rock core inner core is provided with hitch;Institute State hitch by the front support of described rock core inner core in described core bit mechanism;The rear end of described rock core inner core is arranged Have the righting mechanism of its righting;
Described flexible urceolus includes: the first tool joint, the second tool joint and be positioned at described first tool joint with The flexible nipple that multiple head and the tail between described second tool joint connect;
Described flexible nipple includes:
The spline bulb that lengthwise extends, the sidewall of described spline bulb is provided with the first spline;Described spline bulb One end is provided with bulb, and the sidewall of described bulb is provided with multiple track groove along its circumferentially-spaced arrangement;
The ball-and-socket mechanism being flexibly connected with described spline bulb;Described ball-and-socket mechanism has the spherical cavity accommodating described bulb Body;The wall of described spherical cavity is provided with multiple and described track groove pin-and-hole one to one;It is provided with part in described pin-and-hole to stretch Enter the trundle of described track groove;Described trundle and the contact internal walls of described track groove;Described ball-and-socket mechanism offers can be with The second spline that first spline matches.
As one preferred embodiment, described ball-and-socket mechanism includes shell, the first ball-and-socket and end cap;Described shell The described first ball-and-socket front end of fixing connection also forms described spherical cavity;There is on the outer wall of described shell the first spherical structure; The rear end of described shell connects described end cap;Described first ball-and-socket is provided with described second spline;The rear end of described end cap be provided with The second spherical structure that first spherical structure matches.
As one preferred embodiment, described track groove extends along described spline bulb bearing of trend arc, described The bottom surface of track groove extends with described track groove arc in the same direction;Described shell is threadeded with described end cap.
As one preferred embodiment, described pin-and-hole is provided with pin cap away from one end of described ball-and-socket, and described pin cap is prevented Only described trundle comes off from described pin-and-hole.
As one preferred embodiment, the quantity of described track groove is 4, and described track groove is along the week of described bulb To being uniformly distributed.
As one preferred embodiment, each described pin-and-hole is equipped with a described trundle;All described biographies Untie-sell is generally aligned in the same plane.
As one preferred embodiment, sealing ring, institute it are provided with between the wall of described trundle and described spherical cavity State sealing ring and be positioned at the rear of described track groove.
As one preferred embodiment, one end of described first tool joint is provided with drilling rod pin thread;Described first bores The other end of knock-off joint is provided with described bulb;Described ball-and-socket machine it is provided with between described first tool joint and described flexible nipple Structure;Described first tool joint fixed sleeves is provided with back of the body mother;The female shell sphere-contact with described ball-and-socket mechanism of the described back of the body.
As one preferred embodiment, one end of described second tool joint has the second ball-and-socket and described shell, Described spline bulb it is provided with between described second tool joint and described flexible nipple;The rear end of described second ball-and-socket is provided with drilling rod Box.
As one preferred embodiment, described core bit mechanism includes core bit, bit adapter, clip, close Close head, core grabber, shear pin;At least part of described airtight head is in described core bit;Described clip is at described column drill It is sheathed on outside described airtight head and connects the front end of described rock core inner core in Tou;Described clip and described core bit are by shearing Pin connects;Described core grabber is sheathed on outside described airtight head, and described clip the most described core grabber makes described when being moved rearwards by Core grabber shrinks;The rear end of described core bit is connected by described bit adapter with described first tool joint;
It is provided with the first annulus access between described rock core inner core and described flexible urceolus;Described core bit is provided with described The fluid course that first annulus access communicates.
As one preferred embodiment, described hitch is sheathed on outside described rock core inner core, described hitch The rotation that can prevent described core bit mechanism is transferred to described rock core inner core.
As one preferred embodiment, described hitch includes clutch shaft bearing assembly, bearing insert;Described first Bearing assembly is sheathed on outside described rock core inner core;Described bearing insert is sheathed on outside described clutch shaft bearing assembly;Described suspension machine Structure is positioned at the rear of described clip.
As one preferred embodiment, described righting mechanism is positioned at described second tool joint;Described centering guide machine Structure includes the second bearing assembly, circlip, spring, spring back of the body mother;It is provided with step in described second tool joint;Described elasticity Back-up ring is positioned at the groove of described second tool joint;Described second bearing assembly is sheathed on outside the rear end of described rock core inner core And between described circlip and described step;Described spring back of the body mother is connected to the rear end of described rock core inner core, described bullet Second bearing assembly described in the contact of spring one end, spring back of the body mother described in other end contact.
As one preferred embodiment, the rear end of described rock core inner core is additionally provided with pressure balance mechanism, described pressure Dynamic balance mechanism is for balancing the pressure within described rock core inner core.
As one preferred embodiment, described pressure balance mechanism includes inner core pressure balancing piston;Described rock core Inner core is provided with the first through hole and the second through hole along its length;Described second through hole relative to described first through hole near described The rear end of rock core inner core;
The piston region of described inner core pressure balancing piston is in described first through hole front the wall with described rock core inner core Sealing laminating, described inner core pressure balancing piston and described inner core divide water pipe nipple to form the second annulus access;Described first through hole Described first annulus access is connected with described second annulus access;Described second through hole by described second annulus access with described Rock core inner core ft connection.
As one preferred embodiment, the rear end of described pressure balancing piston is provided with overflow valve.
By above description it can be seen that the flexible coring tool of the application is provided with flexible urceolus, the flexibility of flexible urceolus Pipe nipple is constructed by the universal joint that cooperatively forms of spline bulb with ball-and-socket mechanism, thus self can be bent, multiple flexibilities The bending that pipe nipple is formed is overlapped so that the flexible coring tool of the application can carry out ultra-short radius sidetrack horizontal well Drillng operation.
With reference to explanation hereinafter and accompanying drawing, disclose in detail only certain exemplary embodiments of this invention, specify the former of the present invention Reason can be in adopted mode.It should be understood that embodiments of the present invention are not so limited in scope.In appended power In the range of the spirit and terms that profit requires, embodiments of the present invention include many changes, revise and be equal to.
The feature described for a kind of embodiment and/or illustrate can be in same or similar mode one or more Other embodiment individual uses, combined with the feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term " includes/comprises " existence referring to feature, one integral piece, step or assembly herein when using, but also It is not excluded for the existence of one or more further feature, one integral piece, step or assembly or additional.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of invention, for those skilled in the art, on the premise of not paying creative work, it is also possible to root Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the flexible coring tool structural representation that a kind of embodiment of the application provides;
Fig. 2 is profile at C-C in Fig. 1;
Fig. 3 is profile at D-D in Fig. 1.
Detailed description of the invention
For the technical scheme making those skilled in the art be more fully understood that in the application, real below in conjunction with the application Execute the accompanying drawing in example, the technical scheme in the embodiment of the present application is clearly and completely described, it is clear that described enforcement Example is only some embodiments of the present application rather than whole embodiments.Based on the embodiment in the application, this area is common The every other embodiment that technical staff is obtained on the premise of not making creative work, all should belong to the present invention and protect The scope protected.
It should be noted that when element is referred to as " being arranged at " another element, and it can be directly on another element Or element placed in the middle can also be there is.When an element is considered as " connection " another element, and it can be to be directly connected to To another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " left ", For illustrative purposes only, being not offered as is unique embodiment for " right " and similar statement.
Unless otherwise defined, all of technology used herein and scientific terminology and the technical field belonging to the present invention The implication that technical staff is generally understood that is identical.The term used the most in the description of the invention is intended merely to describe tool The purpose of the embodiment of body, it is not intended that in limiting the present invention.Term as used herein "and/or" includes one or more Arbitrary and all of combination of relevant Listed Items.
Refer to Fig. 1 to Fig. 3, the flexible coring tool provided for a kind of embodiment of the application, this flexibility coring tool Apply but be not limited to the drillng operation of ultra-short radius sidetrack horizontal well.In the present embodiment, described flexible coring tool includes The core bit mechanism 100 being sequentially connected with, flexible urceolus;It is equipped with rock core inner core 11 in described flexible urceolus;In described rock core The front end of cylinder 11 is provided with hitch;Described hitch by the front support of described rock core inner core 11 in described core bit In mechanism 100;The rear end of described rock core inner core 11 is provided with the righting mechanism of its righting.
Described flexible urceolus includes: first tool joint the 12, second tool joint 20 and be positioned at described first drilling rod connecting The flexible nipple 200 that multiple head and the tail between 12 with described second tool joint 20 are connected.
Wherein, described flexible nipple 200 includes: the spline bulb 18 that lengthwise extends, on the sidewall of described spline bulb 18 It is provided with the first spline;One end of described spline bulb 18 is provided with bulb, the sidewall of described bulb is provided with multiple along it The track groove of circumferentially-spaced arrangement;The ball-and-socket mechanism being flexibly connected with described spline bulb 18;Described ball-and-socket mechanism has receiving The spherical cavity of described bulb;The wall of described spherical cavity is provided with multiple and described track groove pin-and-hole one to one;Described It is provided with part in pin-and-hole and stretches into the trundle 15 of described track groove;Described trundle 15 contacts with the bottom surface of described track groove;Institute State ball-and-socket mechanism and offer the second spline that can match with the first spline.
When multiple flexible nipples 200 join end to end the flexible urceolus of formation, as it is shown in figure 1, the spline of a flexible nipple 200 Bulb 18 is stretched into its ball-and-socket mechanism by previous flexible nipple 200 rear end, makes the first spline of a flexible nipple 200 and previous flexibility Second spline fitted of pipe nipple 200, thus carry out transmission;Similarly, this flexible nipple 200 is connected with a rear flexible nipple 200 Time, the spline bulb 18 of a rear flexible nipple 200 is stretched into its ball-and-socket mechanism by this flexible nipple 200 rear end, and after making, one is flexible short First spline of joint 200 and the second spline fitted of this flexible nipple 200, thus carry out transmission.
By above description it can be seen that flexible nipple 200 cooperatively forms ten thousand by spline bulb 18 and ball-and-socket mechanism To merism, thus self can be bent, and the bending that multiple flexible nipples 200 are formed is overlapped such that it is able to surpass The drillng operation of short radius lateral drilling horizontal well.
By flexible urceolus and use the drill bit that Universal active is connected with flexible urceolus, form a whole piece flexible chain, this Planting flexible chain and traditional space bend pipe, the guide pipe including multiple laddertrons composition is different.Traditional space bend pipe can only be to One direction bends to approximate 90 ° of bend pipes, and the most no longer shows flexibility, but becomes one section of rigidity bend pipe, this steel The outer rim of property bend pipe once with rub inside the borehole wall, then rigidity bend pipe cannot the most inwardly arch upward and avoid obstacle at all.
Review the flexible urceolus of present embodiment, due between every section of flexible nipple 200 all by spline bulb 18 and ball Nest mechanism carries out universal joint flexible connection, therefore when any one section of flexible nipple 200 and borehole wall generation grazing, and this section of flexibility Pipe nipple 200 all can carry out appropriately curved, thus avoids obstacle, makes to travel under rod bit and can advance freely.And for for solid For the flexible sleeve of well, adjacent two sections of flexible sleeves are flexibly connected by hinged telescoping tube, it is possible to ensure flexible sleeve energy Successfully go downwards to need position along drilling well.
It should be noted that the front and rear direction in the application is with core bit 1 as reference, near taking in two parts The parts of heart drill bit 1 front, away from core bit 1 rear;Such as, the first tool joint 12 to the second tool joint 20 direction For direction from front to back.
Please continue to refer to Fig. 1, spline bulb 18 lengthwise extends, its generally pipe structure.First spline is arranged substantially in The medium position of spline bulb 18 length direction.(during with scope of readers to Fig. 1) bulb is positioned at the rear of the first spline.
The spherical cavity of ball-and-socket mechanism can house spline bulb 18.Wherein, spherical cavity and bulb for being arranged concentrically, with Just spline bulb 18 can carry out universal swing, thus forms angle of bend.The outer surface of bulb and the inner surface of spherical cavity Laminating contact.
As shown in Figure 1 and Figure 2, the track groove that the outer wall of bulb is arranged is along described spline bulb with the bottom surface of track groove 18 bearing of trends (can also be as shown in Figure 1 from top to bottom or from the bottom to top) arc extends, along track groove and bottom surface thereof Arc matches with the contour line of bulb or spherical cavity.As in figure 2 it is shown, track groove cross section is gap shape.As shown in Figure 2 Cross section is it can be seen that the contour line of bottom surface of track groove is concentric circular with the outer contour of bulb.
As in figure 2 it is shown, pin-and-hole radially extends at this cross section, it can be round bar shape.Track is stretched in one end of pin-and-hole Contact in groove and with the bottom surface of track groove.When bulb rotates in spherical cavity, trundle 15 slides relative to track groove, is sliding During Dong, trundle 15 contacts with the bottom surface of track groove all the time, thus ensures that bulb and spherical cavity are for being arranged concentrically.Enter one Step ground, described pin-and-hole is provided with pin cap away from one end of described ball-and-socket, and described pin cap prevents described trundle 15 from taking off from described pin-and-hole Fall.Pin cap is by the plug at end part of pin-and-hole.
Concrete, described ball-and-socket mechanism can include shell the 14, first ball-and-socket 16 and end cap 17.Described shell 14 is fixed Connect described first ball-and-socket 16 front end and form described spherical cavity.On the outer wall of described shell 14, there is the first spherical structure. The rear end of described shell 14 connects described end cap 17;Described first ball-and-socket 16 is provided with described second spline.After described end cap 17 End is provided with the second spherical structure matched with the first spherical structure.
Wherein, shell the 14, first ball-and-socket 16 and end cap 17 are all illustrated in figure 1 nested structure or tubular structure, thus with The flexible nipple 200 that spline bulb 18 is formed has center flow channels.Shell the 14, first ball-and-socket 16, end cap 17 are by upper as shown in Figure 1 Arrange successively under to.Shell 14 matches with the first ball-and-socket 16 formation spherical cavity, and the inwall of shell 14 extends radially through formation Described pin-and-hole.It is transmitted pin 15 before and after ball-and-socket and end cap 17 blocks spacing.As it is shown in figure 1, in the front end face of end cap 17 and inwall The step that section is arranged withstands ball-and-socket, and trundle 15 is withstood in the front end of ball-and-socket, and trundle 15 is positioned in pin-and-hole cannot at fore-and-aft direction Mobile, thus ball-and-socket position is fixed.
As it is shown in figure 1, the front end of end cap 17 is located between shell 14 and the first ball-and-socket 16, meanwhile, on the wall of end cap 17 It is formed for the rear end of shell 14 and the step of the rear end contact of the first ball-and-socket 16.After second spherical structure is arranged at end cap 17 End, for Internal Spherical Surface.First spherical structure is arranged on the outer wall of shell 14, for spherical outside surface.First spherical structure and the second sphere Structure fits contact, carries out guiding auxiliary for the opposing oscillatory between spline bulb 18 and ball-and-socket mechanism, simultaneously, it is to avoid foul Enter the movable sphere between the first ball-and-socket 16 and bulb.
As it is shown on figure 3, the first ball-and-socket 16 is provided with the second spline, the second spline be internal spline and with (next flexible nipple 200) first spline matches.Wherein, the second spline is positioned at the rear of spherical cavity.Spline bulb 18 passes through with ball-and-socket mechanism Spline fitted, can produce and relatively slide and keep the transmission of moment of torsion, consequently facilitating produce between adjacent two flexible nipples 200 Bending.
Further, described shell 14 is threadeded with described end cap 17.Described track groove is equal along the circumference of described bulb Even distribution.Each described track groove and pin-and-hole are equipped with a described trundle 15.All described trundles 15 are positioned at same Plane, thus the bending of flexible nipple 200 can be met, can preferably transmit moment of torsion simultaneously.The quantity of described track groove is many In 4.As in figure 2 it is shown, the quantity of described track groove is 4, the quantity of trundle 15 is similarly 4, and the quantity of pin-and-hole is same It it is 4.Described first spline is external splines, and described second spline is internal spline.Described trundle 15 and described spherical cavity Being provided with sealing ring between wall, described sealing ring is positioned at the rear of described track groove.
In one embodiment, the first tool joint 12 is similarly with flexible nipple 200 and is flexibly connected, the second drilling rod connecting 20 with flexible nipple 200 too for being flexibly connected.
Specifically, as it is shown in figure 1, one end of described first tool joint 12 is provided with drilling rod pin thread.Described first drilling rod connecting The other end of 12 is provided with described bulb.It is provided with described ball-and-socket between described first tool joint 12 and described flexible nipple 200 Mechanism.Described first tool joint 12 fixed sleeves is provided with the back of the body female 2.The described back of the body female 2 and shell 14 sphere of described ball-and-socket mechanism Contact.
Further, as it is shown in figure 1, one end of described second tool joint 20 has the second ball-and-socket 20 and described shell 14, it is provided with described spline bulb 18 between described second tool joint 20 and described flexible nipple 200;Described second ball-and-socket 20 Rear end is provided with drilling rod box.
Flexible nipple 200 can bend in the present embodiment, i.e. produces relative between ball-and-socket mechanism with spline bulb 18 Swing.It is also preferred that the left the camber number of degrees of described flexible nipple 200 are 4 degree to 8 degree.It is arranged such, 5 1/2 " in (5 cun half) well Ultra-short radius sidetrack horizontal well or high angle hole drillng operation that deflecting radius is 1.5-2 rice can be smoothly completed.Concrete, institute The length stating flexible urceolus can be 9 meters to 10 meters.
Please continue to refer to Fig. 1, described core bit mechanism 100 can include core bit 1, bit adapter 6, clip 4, close Close 2, core grabber 5, shear pin 3.At least part of described airtight 2 in described core bit 1.Described clip 4 is described It is sheathed in core bit 1 outside described airtight 2.Clip 4 is connected with the front end of rock core inner core.Described clip 4 is cored with described Drill bit 1 is connected by shear pin 3.Described core grabber 5 is sheathed on outside described airtight 2, the described the most described core grabber of clip 4 5 make described core grabber 5 shrink when being moved rearwards by.Described bit adapter 6 is by the rear end of described core bit 1 and described first drilling rod Joint 121 is connected.
Described core bit 1 generally structure of tube body, is arc transition between its outer wall inward wall, consequently facilitating creep into. It is inserted in core bit 1 for airtight 2.The front end of airtight 2 is rounding structure.The inside of described core bit 1 is provided with for card The step of the front end contact of hoop 4.The rear end of clip 4 is connected with the front end of rock core inner core.It is provided with the most gradually in clip 4 The first conical surface expanded.Core grabber 5 is positioned at clip 4, and the first conical surface that core grabber 5 is externally provided with clip 4 is joined The second conical surface closed.As it is shown in figure 1, the front end of core grabber 5 and front end (or top) reserved part of the first conical surface Distance, when the relative core grabber 5 of clip 4 is moved rearwards by, the first conical surface makes core grabber 5 shrink.Core grabber 5 inwall is provided with tiltedly Tooth, it can live rock core with anchor.Offering groove or through hole that the helical teeth for core grabber 5 stretches on airtight 2, airtight 2 backward Core grabber 5 can be strutted time mobile.The quantity of shear pin 3 the most multiple (one can also).
It is provided with the first annulus access 28 between described rock core inner core 11 and described flexible urceolus.Described core bit 1 is provided with The fluid course 29 communicated with described first annulus access 28.Concrete, fluid course 29 is arranged at core bit 1, drill bit connects On the wall of 6, in order to the flowing of drilling fluid.As it is shown in figure 1, the front end of bit adapter 6 is provided with external screw thread.Bit adapter 6 Threaded with core bit 1 in extending into core bit 1 in front end.
Described hitch is positioned at described core bit mechanism 100;Described hitch is sheathed on described rock core inner core Outward.Described airtight 2 can slip into described rock core inner core.Described hitch can prevent described core bit mechanism 100 Rotation is transferred to rock core inner core.
Concrete, described hitch includes clutch shaft bearing assembly 7, bearing insert.Described clutch shaft bearing assembly is sheathed on Outside described rock core inner core;Described bearing insert is sheathed on outside described clutch shaft bearing assembly.Described hitch is positioned at described clip Rear.
The front end of the rear end threaded rock core inner core of described clip 4.Clutch shaft bearing assembly 7 is positioned at rear end and the axle of clip Hold between the rear end of lining.Wherein, clutch shaft bearing assembly can include bearing 9 (such as: taper roll bearing), bearing cap 7.Axle Hold outside lid 7 is covered on the front ends of described bearing 9 and is sheathed on the rear end of clip 4.Bearing 9 is fixed in bearing insert 8, jewel Set 8 is sheathed in bit adapter 6 (core bit 1).It is protruding that the rear end of bearing insert 8 is inwardly formed undergauge.The rear end of bearing 9 with Bearing seal ring 10 it is provided with between undergauge projection.The front end of clutch shaft bearing assembly contacts with rear end, the undergauge projection of clip 4 simultaneously Prop up.
Well is outside upper when carrying this flexibility coring tool, core bit 1 drive clip 4 (during with scope of readers to Fig. 1) move down (after Move), core grabber 5 by rock core pinch off by helical teeth, meanwhile, is relied on core grabber to contact with clip 4, thus together takes out of outside well.
Please continue to refer to Fig. 1, described righting mechanism is positioned at described second tool joint 20.Described righting mechanism includes Two bearing assemblies, circlip 23, spring 25, the spring back of the body female 26.Wherein, it is provided with step in described second tool joint 20;Institute State circlip 23 and be positioned at the groove of described second tool joint 20.Described second bearing assembly is sheathed in described rock core Outside the rear end of cylinder 11 and between described circlip 23 and described step.The described spring back of the body female 26 is connected in described rock core The rear end of cylinder 11, the second bearing assembly described in the contact of described spring 25 one end, the spring back of the body female 26 described in other end contact.
The rear end of described rock core inner core 11 is additionally provided with pressure balance mechanism, and described pressure balance mechanism is used for balancing described Pressure within rock core inner core 11.Concrete, described pressure balance mechanism can include inner core pressure balancing piston 27.Described rock Intracardiac cylinder is provided with the first through hole 31 and the second through hole 32 along its length.Described second through hole 32 is relative to described first through hole 31 near the rear end of described rock core inner core 11.The piston portion 271 of described inner core pressure balancing piston 27 is positioned at described first through hole 31 fronts the wall with described rock core inner core 11 seal laminating.Described inner core pressure balancing piston 27 and described rock core inner core 11 shape Become the second annulus access 30.Described first annulus access 29 is connected by described first through hole 31 with described second annulus access 30; Described second through hole 32 is by described second annulus access 30 and described rock core inner core 11 ft connection.For in balance rock core further The pressure of cylinder 11, the rear end of described pressure balancing piston 20 is provided with overflow valve (accompanying drawing does not shows that).
Now, the spring back of the body female 26 is threadedly connected to the rear end of rock core inner core 11.The piston portion of inner core pressure balancing piston 20 It is provided with sealing ring between 271 circumferences and the inwall of rock core inner core 11.Second bearing assembly can include bearing 21 (such as: circle Taper roller bearing), the bearing outer ring back of the body is female 22, bearing inner shield ring 24.Bearing 21 is fixed on the bearing outer ring back of the body female 22 and the second ball-and-socket In between the step of the inwall of 19, the bearing outer ring back of the body female 22 is threaded connection fixed cover and is located in the second ball-and-socket 19.Elastic gear Circle is positioned at the rear of the bearing outer ring back of the body female 22, and bearing inner shield ring 24 is sheathed on described circlip 23, described bearing outer ring back of the body mother Between 22 and the rear end of described rock core inner core 11.The rear end of bearing inner shield ring 24 is by spring 25 contact.
The core process of the flexible coring tool that use above-mentioned embodiment is described more fully below: (1) is by ultra-short radius Sidetracked hole is drilled into predetermined position of coring;(2) by the flexible coring tool of present embodiment down to position of coring;(3) well outer circulation Drilling fluid, slowly starts rotary power, and drilling fluid passes sequentially through the second annulus access 31, through hole the 30, first annulus access 28, liquid The landwaste that shaft bottom is precipitated is cleaned by circulation road 29;(4) increasing the pressure of the drill outside well, core bit mechanism 100 starts to drill through rock core;(5) Being pushed by rock core for airtight 2, shear pin 3 is cut off by airtight 2, airtight 2 under the promotion of rock core to rock core inner core 11 internal retractions;(6) airtight 2 by the sealing fluid in extruding rock core inner core 11, and sealing fluid is 2 excessive to rock core position by airtight Put, rock core is wrapped up;(7) core bit mechanism 100 constantly drills through rock core, and the sealing fluid in rock core inner core 11 constantly wraps up Rock core, until drilling through sufficiently long rock core;(8) carrying drilling tool on well head, whole flexible coring tool departs from bit operation face, this Time, core grabber 5 can hold rock core tightly under upper lifting force effect, and the conical outer surface of core grabber 5 and the cone-shaped inner surface of clip 4 are joined Close, rock core is drawn tighter and tighter, until rock core fracture, it is achieved cut the heart;(9) carry drilling tool in continuation, rock core is proposed well head;(10) take Go out to fill the rock core inner core 11 of rock core, rock core is encapsulated standby.
Herein cited any digital value all include between lower limit to higher limit with the lower value of an incremented and , between any lower value and any much higher value, there is the interval of at least two unit in all values of upper value.For example, as Fruit elaborates that the quantity of parts or the value of process variable (such as temperature, pressure, time etc.) are from 1 to 90, preferably from 20 To 80, more preferably from 30 to 70, then list such as 15 to 85,22 during purpose illustrates that this description the most clearly and arrive 68,43 to 51,30 to 32 is equivalent.For the value less than 1, suitably think that a unit is 0.0001,0.001,0.01,0.1. These only want the example clearly expressed, it is believed that the institute of the numerical value enumerated between minimum and peak is likely Combination is expressly set forth in this description the most in a similar manner.
Except as otherwise noted, all scopes all include all numerals between end points and end points.It is used together with scope " about " or " approximation " be suitable for two end points of this scope.Thus, " about 20 to 30 " are intended to cover that " about 20 to about 30 ", the end points indicated at least is included.
The all articles disclosed and reference material, including patent application and publication, for various purposes by quoting knot Together in this.Describe combination term " substantially by ... constitute " should include determined by element, composition, parts or step and reality Other elements, composition, parts or the step of the basic novel feature of this combination is not affected in matter.Use term " comprise " or " include " combination describing element, composition, parts or step here it is also contemplated that basic by these elements, composition, parts Or the embodiment that step is constituted.Here by use term " can ", it is intended to illustrate that " permissible " include is described any Attribute is all optional.
Multiple elements, composition, parts or step can be provided by single integrated component, composition, parts or step.Alternative Ground, single integrated component, composition, parts or step can be divided into multiple elements, composition, parts or the step of separation.It is used for The open "a" or "an" describing element, composition, parts or step is not said to get rid of other element, composition, parts Or step.
It should be understood that above description is to illustrate rather than to limit.By reading above-mentioned retouching Stating, the many embodiments outside the example provided and many application will be the most all aobvious and easy See.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should with reference to claims and this The four corner of the equivalent that a little claim are had determines.Include specially for comprehensive purpose, all articles and reference The disclosure of profit application and bulletin is all passed through with reference to being incorporated herein.Theme disclosed herein is omitted in aforementioned claim Any aspect is not intended to abandon this body matter, also should not be considered as inventor and is not thought of as disclosed by this theme A part for subject matter.

Claims (16)

1. a flexible coring tool, it is characterised in that including: the core bit mechanism being sequentially connected with, flexible urceolus;Described soft It is equipped with rock core inner core in property urceolus;The front end of described rock core inner core is provided with hitch;Described hitch is by described rock The front support of intracardiac cylinder is in described core bit mechanism;The rear end of described rock core inner core is provided with the centering guide machine of its righting Structure;
Described flexible urceolus includes: the first tool joint, the second tool joint and be positioned at described first tool joint with described The flexible nipple that multiple head and the tail between second tool joint connect;
Described flexible nipple includes:
The spline bulb that lengthwise extends, the sidewall of described spline bulb is provided with the first spline;One end of described spline bulb It is provided with bulb, the sidewall of described bulb is provided with multiple track groove along its circumferentially-spaced arrangement;
The ball-and-socket mechanism being flexibly connected with described spline bulb;Described ball-and-socket mechanism has the spherical cavity accommodating described bulb; The wall of described spherical cavity is provided with multiple and described track groove pin-and-hole one to one;It is provided with part in described pin-and-hole and stretches into institute State the trundle of track groove;Described trundle and the contact internal walls of described track groove;Described ball-and-socket mechanism offers can be with first The second spline that spline matches.
2. flexible coring tool as claimed in claim 1, it is characterised in that: described ball-and-socket mechanism includes shell, the first ball-and-socket And end cap;Described shell is fixing to be connected described first ball-and-socket front end and forms described spherical cavity;On the outer wall of described shell There is the first spherical structure;The rear end of described shell connects described end cap;Described first ball-and-socket is provided with described second spline;Described The rear end of end cap is provided with the second spherical structure matched with the first spherical structure.
3. flexible coring tool as claimed in claim 2, it is characterised in that: described track groove is along described spline bulb extension side Extending to arc, the bottom surface of described track groove extends with described track groove arc in the same direction;Described shell is with described end cap screw thread even Connect.
4. flexible coring tool as claimed in claim 2, it is characterised in that: described pin-and-hole is provided with away from one end of described ball-and-socket Pin cap, described pin cap prevents described trundle from coming off from described pin-and-hole.
5. flexible coring tool as claimed in claim 2, it is characterised in that: the quantity of described track groove is 4, described track Groove is uniformly distributed along the circumference of described bulb.
6. flexible coring tool as claimed in claim 2, it is characterised in that: each described pin-and-hole is equipped with a described biography Untie-sell;All described trundles are generally aligned in the same plane.
7. coring tool as claimed in claim 1 flexible, it is characterised in that: the wall of described trundle and described spherical cavity it Between be provided with sealing ring, described sealing ring is positioned at the rear of described track groove.
8. flexible coring tool as claimed in claim 2, it is characterised in that: one end of described first tool joint is provided with drilling rod Pin thread;The other end of described first tool joint is provided with described bulb;Between described first tool joint and described flexible nipple It is provided with described ball-and-socket mechanism;Described first tool joint fixed sleeves is provided with back of the body mother;The described back of the body female with described ball-and-socket mechanism outside Shell sphere-contact.
9. flexible coring tool as claimed in claim 2, it is characterised in that: one end of described second tool joint has second Ball-and-socket and described shell, be provided with described spline bulb between described second tool joint and described flexible nipple;Described second ball The rear end of nest is provided with drilling rod box.
10. coring tool as claimed in claim 1 flexible, it is characterised in that: described core bit mechanism include core bit, Bit adapter, clip, airtight head, core grabber, shear pin;At least part of described airtight head is in described core bit;Described Clip is sheathed in described core bit outside described airtight head and connects the front end of described rock core inner core;Described clip is with described Core bit is connected by shear pin;Described core grabber is sheathed on outside described airtight head, the most described core grabber of described clip Described core grabber is made to shrink when being moved rearwards by;Described bit adapter is by the rear end of described core bit and described first tool joint It is connected;
It is provided with the first annulus access between described rock core inner core and described flexible urceolus;Described core bit is provided with and described first The fluid course that annulus access communicates.
11. flexible coring tools as claimed in claim 10, it is characterised in that: described hitch is sheathed in described rock core Outside Tong, described hitch can prevent the rotation of described core bit mechanism to be transferred to described rock core inner core.
12. flexible coring tools as claimed in claim 11, it is characterised in that: described hitch includes clutch shaft bearing group Part, bearing insert;Described clutch shaft bearing assembly is sheathed on outside described rock core inner core;Described bearing insert is sheathed on described first axle Outside bearing assembly;Described hitch is positioned at the rear of described clip.
13. flexible coring tools as claimed in claim 12, it is characterised in that: described righting mechanism is positioned at described second drilling rod In joint;Described righting mechanism includes the second bearing assembly, circlip, spring, spring back of the body mother;In described second tool joint It is provided with step;Described circlip is positioned at the groove of described second tool joint;Described second bearing assembly is sheathed on institute State outside the rear end of rock core inner core and between described circlip and described step;Described spring back of the body mother is connected to described rock core The rear end of inner core, the second bearing assembly described in described spring one end contact, spring back of the body mother described in other end contact.
14. flexible coring tools as claimed in claim 13, it is characterised in that: the rear end of described rock core inner core is additionally provided with pressure Dynamic balance mechanism, described pressure balance mechanism is for balancing the pressure within described rock core inner core.
15. flexible coring tools as claimed in claim 14, it is characterised in that: described pressure balance mechanism includes inner core pressure Dummy piston;Described rock core inner core is provided with the first through hole and the second through hole along its length;Described second through hole is relative to institute State first through hole rear end near described rock core inner core;
The piston region of described inner core pressure balancing piston seals in described first through hole front and with the wall of described rock core inner core Laminating, described inner core pressure balancing piston and described inner core divide water pipe nipple to form the second annulus access;Described first through hole is by institute State the first annulus access to connect with described second annulus access;Described second through hole is by described second annulus access and described rock core Inner core ft connection.
16. flexible coring tools as claimed in claim 15, it is characterised in that: the rear end of described pressure balancing piston is provided with Overflow valve.
CN201610649752.XA 2016-08-10 2016-08-10 Flexible coring tool Active CN106121575B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112012685A (en) * 2020-10-11 2020-12-01 东北石油大学 Horizontal well in-situ monitoring fidelity continuous coring tool

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Publication number Priority date Publication date Assignee Title
CN201050318Y (en) * 2007-05-22 2008-04-23 辽河石油勘探局 Loose ground closed core-picking tool
CN202047748U (en) * 2011-04-19 2011-11-23 北京百利时能源技术有限责任公司 Ultra short radius horizontal well flexible drilling tool
CN203130004U (en) * 2013-01-11 2013-08-14 中国石油化工股份有限公司 Two-bearing hanging device of sealed coring tool
CN103775001A (en) * 2012-10-18 2014-05-07 中国石油化工股份有限公司 Flexible drilling rod for radial horizontal well drilling
EP2896780A1 (en) * 2014-01-17 2015-07-22 Sandvik Mining and Construction Lyon SAS Flexible drill rod

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201050318Y (en) * 2007-05-22 2008-04-23 辽河石油勘探局 Loose ground closed core-picking tool
CN202047748U (en) * 2011-04-19 2011-11-23 北京百利时能源技术有限责任公司 Ultra short radius horizontal well flexible drilling tool
CN103775001A (en) * 2012-10-18 2014-05-07 中国石油化工股份有限公司 Flexible drilling rod for radial horizontal well drilling
CN203130004U (en) * 2013-01-11 2013-08-14 中国石油化工股份有限公司 Two-bearing hanging device of sealed coring tool
EP2896780A1 (en) * 2014-01-17 2015-07-22 Sandvik Mining and Construction Lyon SAS Flexible drill rod

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112012685A (en) * 2020-10-11 2020-12-01 东北石油大学 Horizontal well in-situ monitoring fidelity continuous coring tool

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