CN105298461A - Full-bore infinite-time soluble-ball-type fracturing sliding sleeve - Google Patents
Full-bore infinite-time soluble-ball-type fracturing sliding sleeve Download PDFInfo
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- CN105298461A CN105298461A CN201510736636.7A CN201510736636A CN105298461A CN 105298461 A CN105298461 A CN 105298461A CN 201510736636 A CN201510736636 A CN 201510736636A CN 105298461 A CN105298461 A CN 105298461A
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Abstract
The invention discloses a full-bore infinite-time soluble-ball-type fracturing sliding sleeve. Machining of, layered control over and the like of an existing sliding sleeve are achieved. The full-bore infinite-time soluble-ball-type fracturing sliding sleeve is specifically composed of a plurality of sliding sleeve assemblies and a plurality of soluble balls. Each sliding sleeve assembly comprises a body, a sectioned ball seat, springs, a rotating sliding sleeve body and a bearing. The diameters of the sliding sleeve assemblies are sequentially increased from bottom to top, and each sliding sleeve assembly is at least provided with one soluble ball with the corresponding outer diameter. Due to the adoption of the sectioned ball seats, effective flow area can be guaranteed; the sectioned ball seats can convert axial movement into rotation movement through pin and sawtooth-similar-shaped sliding way combinations, the torque of the sectioned ball seats is transmitted through connecting rods on the rotating sliding sleeves, rotation of the rotating sliding sleeves is achieved, and then a fracturing opening is opened or closed; due to the adoption of the soluble balls, repeated opening and closing of a channel can be achieved.
Description
Technical field
The present invention relates to a kind of fracturing sliding bush, particularly a kind of ball-throwing type fracturing sliding bush.
Background technology
Along with the progress of petroleum exploration and development, Oil/gas Well oil testing tech is constantly updated.Domestic multilayer multistage fracturing reform mode many employings sliding sleeve class instrument, stage differential style is adopted to design between sliding sleeve at different levels, the ball sealer that need drop into some the ascending sizes corresponding with place level sliding sleeve is successively to complete the unlatching of each section of sliding sleeve and the isolation with the section of transformation, the ball sealer of the rear shutoff ball seat of pressure returns row's mode by open flow and discharges, down-hole stayed by sliding sleeve, ball seat, and in final pit shaft, latus rectum is less.Due to the impact by ball seat internal diameter, the discharge capacity of construction also can be restricted.
Chinese patent notification number: 102345452A, provides one " self-formed ball seat sliding sleeve ", is applied to oil well delamination pressure break.This invention is the sliding sleeve forming ball seat after the induction pressure of a kind of down-hole, comprise be linked in sequence top connection, split ring, back-up ring, threaded plug type feather key, shear pin, urceolus, sliding sleeve, cone seat, from lock tube, fixed cover, slip mandrel, shear pin and lower contact.This invention adopts lower contact pressure transmission hole to accept pressure, pressure acts on slide cores bearing and to present a theatrical performance as the last item on a programme rank, pin between fixed cover and slip mandrel is cut off, slip mandrel slides to motion, " V " shape open slot that falls closes up formation internal diameter 57mm annulus gradually in ball seat, now realize engagement with the ratchet of ball seat or open slot from the ratchet of lock tube or lock ring, complete being fixedly connected with of slip mandrel and sliding sleeve, only need when transforming piecemeal to throw same ball, under just can ensureing that operational discharge capacity is no longer subject to the prerequisite of the impact of ball seat internal diameter, complete the rebuilding construction of all horizontal segments.
But still there are problems in this patent, the particularly pressure conducting bores processing difficulties of this patent, during work, also needs to utilize capillary tube to suppress to aperture in lower contact, and undeclaredly in patent how to realize hierarchical control, undeclaredly how could suppress to designated layer the contraction realizing ball seat.
Summary of the invention
In order to solve the problem in background technology, the invention provides the unlimited solvable ball fracturing sliding bush of a kind of full-bore, this fracturing sliding bush can not only ensure operational discharge capacity, and the number of times opened of sliding sleeve significantly increases, hierarchical control can be realized, can repeat switch, the row of returning is convenient, and can open the sliding sleeve of optional position as required.
For achieving the above object, the technical solution used in the present invention is: the unlimited solvable ball fracturing sliding bush of a kind of full-bore, be made up of some grades of slide bushing assemblies and several solvable balls, the latus rectum of slide bushing assembly at different levels increases from bottom to up successively, every one-level slide bushing assembly is at least equipped with the solvable ball of a corresponding external diameter, every one-level slide bushing assembly comprises main body, distinguish ball seat, spring, rotation sliding sleeve and bearing, wherein:
Described main body is cylindric, the first half of main body inner wall is provided with reducer, this reducer is divided into again extension diameter section and undergauge section from top to bottom, the latter half of main body inner wall circumferentially arranges class zigzag slideway, such each unit of zigzag slideway, comprises flex point, lower flex point, up slideway and descending slideway, and the below of main body circumferentially arranges some external pressure ceasmas, the lower end of body lumen arranges step, and step has rolling bearing with main body interference fit.
Described distinguish ball seat, its matrix is annulus shell-like, be placed in main body, distinguish ball seat matrix circumferentially top extension is provided with some ball pawls, arranges the lock ball step for accepting solvable ball inside each ball pawl, pitching builds the pressure, distinguish ball seat is descending along main body, and during extension diameter section by reducer, ball pawl radial dilatation strengthens gradually, when walking to undergauge section, solvable ball falls from lock ball step; The below of distinguish ball seat circumferentially arranges some strip longitudinal sockets and uniform some pins, and pin is inserted in the class zigzag slideway in main body.
Described rotation sliding sleeve, its matrix is annulus shell-like, be seated on the swivel bearing in main body, rotation sliding sleeve circumferentially top extension is provided with some strip connecting rods, strip connecting rod is plugged in the longitudinal socket of distinguish ball seat, connecting rod root rotates between the upper surface of sliding sleeve and the lower surface of distinguish ball seat goes back fixing spring, spring in the raw time, pin on the height stand distinguish ball seat of spring is sitting at the upper flex point place of class sawtooth slideway, and the insertion depth of connecting rod is less than the degree of depth of longitudinal socket; Rotate circumferentially be provided with below sliding sleeve equal with external pressure ceasma quantity in pressure break hole, the center of interior pressure break hole and external pressure ceasma is in same level, during pressure break pathway closure, interior pressure break hole is equal with the angle that two adjacent upper flex point phase places of class zigzag slideway differ with the angle that external pressure ceasma phase place differs.
Preferably, the quantity of pressure break hole and external pressure ceasma is respectively 2, and interior pressure break hole differs 90 ° with in external pressure ceasma phase place, and class sawtooth slideway element number is 4.
Beneficial effect of the present invention:
1. split-type ball seat is compared with common ball seat, and the design of distinguish ball seat makes to be just that the minimum orlop of latus rectum also can ensure larger discharge capacity, increases the effective area of passage of liquid, decreases energy loss to greatest extent;
2. rotating sliding sleeve after improving coordinates solvable ball or self-destruction ball (blast self-destruction) to use, and can realize the cycling switch of passage, when pressing layer not reach effect of increasing production, and energy refracturing;
3., during ball solvable with the differential design of 2mm, this sliding sleeve fracturing instrument can pressure break 20 sections of oil reservoirs.Instrument maximum outside diameter 110mm, latus rectum 68mm; Solvable ball (27 ~ 67mm);
4. split-type ball seat is combined axially-movable can be converted to rotary motion by pin and class zigzag slideway, is transmitted the moment of torsion of split-type ball seat, achieve and rotate the rotation of sliding sleeve and then the opening and closing of control fracturing mouth by the connecting rod rotated on sliding sleeve;
5. normal ball-throwing type fracturing technology is when completing the pressing crack construction of interval of interest, has pressed the steel ball of interval that anti-to arrange or pressure phenomenon is told on stratum directly easily occurs with strata pressure effect.This patent overcomes this shortcoming, and for the interval of pressure that solvable ball is closed, strata pressure directly acts on split-type ball seat inwall, and its pressure can not entering tool inner chamber and solvable ball be had an effect, and there will not be that solvable ball is counter to be arranged and pressure phenomenon told by bottom.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of the unlimited solvable ball fracturing sliding bush of full-bore of the present invention.
Fig. 2 is the structural representation of main body.
Fig. 3 is the structural representation of distinguish ball seat.
Fig. 3 A is the partial enlarged drawing in I portion in Fig. 3.
Fig. 4 is the structural representation rotating sliding sleeve.
Fig. 5 is class zigzag slideway expanded view.
Fig. 6 a is solvable ball and the initial contact state diagram of distinguish ball seat and now pin running orbit figure.
Fig. 6 b is that solvable ball moves downwardly to state diagram on ball seat step and now pin running orbit figure.
Fig. 6 c state diagram that to be solvable ball fall from distinguish ball seat step and now pin running orbit figure.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described further:
Embodiment 1
The unlimited solvable ball fracturing sliding bush of a kind of full-bore, be made up of some grades of slide bushing assemblies and several solvable balls, the latus rectum of slide bushing assembly at different levels increases from bottom to up successively, slide bushing assembly in the present embodiment upper and lower latus rectum difference 2mm, the external diameter of above-mentioned solvable ball also differs 2mm successively, as shown in Figure 1: every one-level slide bushing assembly comprises main body 1, distinguish ball seat 2, spring 3, rotates sliding sleeve 4 and bearing 5, wherein:
Shown in Fig. 2 composition graphs 1: described main body 1 is cylindric, the first half of main body inner wall is provided with reducer, this reducer is divided into again extension diameter section 1-1 and undergauge section 1-2 from top to bottom, the latter half of main body inner wall circumferentially arranges class zigzag slideway, such zigzag slideway has 4 sawtooth unit, as shown in Figure 5: each unit of class zigzag slideway, comprise flex point 1-3, lower flex point 1-6, up slideway 1-5 and descending slideway 1-4, the below of main body circumferentially arranges 2 external pressure ceasma 1-7, two external pressure ceasma 1-7 phase places differ 180 °, the lower end of main body 1 inner chamber arranges step, step there is rolling bearing 5 with main body 1 interference fit.
Shown in Fig. 3 composition graphs 3A: described distinguish ball seat 2, its matrix is annulus shell-like, be placed in main body 1, distinguish ball seat matrix circumferentially top extension is provided with some ball pawl 2-1, arranges the lock ball step 2-3 for accepting solvable ball 6 inside each ball pawl 2-1, pitching builds the pressure, distinguish ball seat 2 is descending along main body 1, and during extension diameter section 1-1 by reducer, ball pawl 2-1 radial dilatation strengthens gradually, when walking to undergauge section 1-2, solvable ball 6 drops from lock ball step 2-3; The top of ball pawl 2-1 arranges spigot surface 2-2, and the below of distinguish ball seat circumferentially arranges some strip longitudinal socket 2-4 and uniform some pin 2-5, pin 2-5 are inserted in the class zigzag slideway in main body 1.
Shown in Fig. 4 composition graphs 1: described rotation sliding sleeve 4, its matrix is annulus shell-like, be seated on the swivel bearing 5 in main body 1, rotation sliding sleeve circumferentially top extension is provided with some strip connecting rod 4-1, strip connecting rod 4-1 is plugged in the longitudinal socket 2-4 of distinguish ball seat, connecting rod root rotates between the upper surface of sliding sleeve and the lower surface of distinguish ball seat goes back fixing spring 3, spring 3 in the raw time, pin 2-5 on the height stand distinguish ball seat of spring 3 is sitting at the upper flex point 1-3 place of class sawtooth slideway, and now the insertion depth of connecting rod 4-1 is less than the degree of depth of longitudinal socket 2-4.Rotate below sliding sleeve and be circumferentially provided with 2 interior pressure break hole 4-2, the center of interior pressure break hole 4-2 and external pressure ceasma 1-5 is in same level, during pressure break pathway closure, interior pressure break hole is equal with adjacent two angles gone up or lower flex point phase place differs of class sawtooth slideway with the angle that external pressure ceasma phase place differs, and is 90 °.
Described solvable ball 6, adopt published solvable pressure break ball in prior art, the exposed band of such as soluble material is the solvable alloy of 5-gallium-aluminium, is made up of the aluminium of percetage by weight 85%, gallium-aluminium alloys, the Bi of the 5% and Cr of 5% of 5%.This material is insoluble to oil but water soluble.In the water of 70 DEG C, ensure pressure-bearing and pressure break demand in 5 hours, dissolve completely in 15 days.
Illustrate the course of work of fracturing sliding bush of the present invention below:
one, drop into and first floor (bottom) match solvable ball time, the course of work of this fracturing sliding bush
Solvable ball 6 is dropped at well head, the solvable ball of small displacement pumping 6 to destination locations, as shown in Figure 6 a, when solvable ball 6 contacts with the spigot surface 2-2 of distinguish ball seat 2, improve infusion discharge capacity, solvable ball is axial downward thrust because chock pressure difference produces, then solvable ball 6 is by the spigot surface 2-2 slide downward along distinguish ball seat 2.At the solvable ball 6 slide downward initial stage, because the ball pawl 2-1 radial direction of distinguish ball seat 2 is retrained by main body 1 inwall, axially downward motion can only be done under the promotion of solvable ball 6.When ball pawl 2-1 moves to main body 1 extension diameter section, because inner major diameter expands gradually, ball pawl 2-1 is under the promotion of solvable ball 6, produce axial downward movement and radial dilatation motion simultaneously, state as shown in Figure 6 b, now, due to the radial dilatation of ball pawl 2-1, solvable ball 6 is descending and be stuck on lock ball step 2-3.Continue to improve pump pressure, solvable ball 6 promotes ball pawl 2-1 to be continued descending and continues radial dilatation occurs, when ball pawl 2-1 move to main body 1 internal diameter maximum time, lock ball step 2-3 place ball internal diameter that pawl encloses will be expanded to equal with solvable ball 6 external diameter, solvable ball 6 departs from the constraint of ball pawl 2-1 and drops, ball pawl 2-1 axially-movable stops, now state as fig. 6 c.
Shown in Fig. 6 a ~ 6c: promote in the process that distinguish ball seat 2 moves downward at solvable ball 6, pin 2-5 on distinguish ball seat 2 moves from upper flex point 1-3 during original state along the downward flex point 1-6 of descending slideway 1-4, distinguish ball seat 2, by under the guiding of descending slideway 1-4, does the motion of downward dextrorotation; Distinguish ball seat 2 is when down stroke, meeting Compress Spring 3, although the connecting rod 4-1 rotating sliding sleeve 4 inserts in the longitudinal socket 2-4 of distinguish ball seat 2, but now connecting rod 4-1 is not inserted into the bottom of longitudinal socket 2-4, so distinguish ball seat 2 is when doing the motion of downward dextrorotation, only transfer torque to and rotate on sliding sleeve 4, and axial force is eliminated by the depth difference between connecting rod 4-1 and longitudinal socket 2-4, therefore, rotate sliding sleeve 4 and can only do relative rotary motion with main body 1.Because upper flex point 1-3 differs 45 ° with in lower flex point 1-6 phase place, so distinguish ball seat down stroke process can rotate 45 °, then distinguish ball seat 2 also have rotated 45 ° simultaneously.
When solvable ball 6 is completely by distinguish ball seat 2, the active force acted on distinguish ball seat 2 disappears, can imagine, pin 2-5 on distinguish ball seat 2 is under the bounce effect of spring 3, to enter and creep along uplink path 1-5, pin 2-5 moves in the process of upper flex point 1-3 by lower flex point 1-6, and distinguish ball seat 2 driven rotary sliding sleeve 4 have rotated again 45 °, and ball pawl 2-1 also recovers initial position.
As can be seen from the description of two sections above, be put into until completely by distinguish ball seat 2 from solvable ball 6, rotate sliding sleeve 4 under the drive of distinguish ball seat 2, have rotated 90 ° altogether.During initial position, under namely pressure break passage is in closed condition, interior pressure break hole 4-2 differs 90 ° with external pressure ceasma 1-7 in same level and in phase place, after said process, interior pressure break hole 4-2 will overlap with external pressure ceasma 1-7, and now, first floor pressure break passage is opened.
two, the solvable ball 6 matched with the second layer (inverse) is dropped at well head, the course of work of this fracturing sliding bush
Second layer pressure break passage opening process is identical with first floor pressure break passage opening process, do not repeat them here, unlike, the solvable ball 6 of the second layer is completely by after second layer slide bushing assembly, the first floor slide bushing assembly being arranged in below can be fallen into undoubtedly, now improve infusion discharge capacity, the solvable ball of this second layer is axial downward thrust because chock pressure difference produces, the the first distinguish ball seat 2 promoted in first floor slide bushing assembly moves downward, and spring in first floor slide bushing assembly and rotate sliding sleeve and can link thereupon, when the upper port of the first distinguish ball seat 2 moves to the interface point of the extension diameter section 1-1 of main body 1 and undergauge section 1-2, ball pawl 2-1 opens completely, wrap the solvable ball 6 of the second layer, but due to physical dimension design, the external diameter of the solvable ball 6 of the second layer dropped into is greater than the latus rectum of first floor slide bushing assembly, so, the solvable ball 6 of the second layer can not pass through the first distinguish ball seat, but be stuck in this position and self-locking, the first distinguish ball seat 2 is caused to move downward, also cannot shrink and move upward, be understood that, in this process, first distinguish ball seat 2 have rotated 45 °, first rotates sliding sleeve also have rotated 45 ° thereupon, and first floor pressure break passage is opened before, namely in, pressure break hole 4-2 overlaps with external pressure ceasma 1-7, after first rotation sliding sleeve have rotated 45 °, interior pressure break hole 4-2 differs 45 ° with in external pressure ceasma 1-7 phase place, first floor pressure break pathway closure.
So, when one deck pressure break passage opened by solvable ball 6, all will close the pressure break passage of lower one deck.
three, the control between different interval:
Describe from duty above and be not difficult to find, the solvable ball of real control 6 can by the key of distinguish ball seat 2 be ball pawl 2-1 complete expanding time minimum diameter size, define the latus rectum that this minimum diameter is this slide bushing assembly, when this minimum diameter is greater than the solvable ball sphere diameter of input, solvable ball passes through.When this minimum diameter is less than the solvable ball sphere diameter by dropping into, solvable ball does not pass through.Therefore, for controlling the pressure break channel switch of different interval, should from shaft bottom to well head direction, the latus rectum arranging slide bushing assembly at different levels increases successively.For example, want the pressure break passage of closing first floor pressure break at present, open the second layer closed on and treat fractured interval pressure break passage, should drop into and can open the solvable ball that the second layer treats fractured interval pressure break passage, this ball removes the pressure break passage of closing first floor pressure break the most at last.To close the pressure break passage of second layer pressure break, opening the third layer of closing on and treating fractured interval pressure break passage, just should drop into and can open the solvable ball that third layer treats fractured interval pressure break passage, this ball removes to close the pressure break passage of stifled second layer pressure break the most at last.The like, the open and close of all interval pressure break passages can be completed.
four, the repeat switch of pressure break passage
For any fractured interval, after fracturing work completes, place interval pressure break pathway closure, its distinguish ball seat all has a solvable ball 6, and solvable ball 6 melts and disappears after after a while, and original state got back to by distinguish ball seat 2.Now, reopening of pressure break passage can be realized by again dropping into the solvable ball 6 matched with corresponding interval.Principle according to this, the number of times that every lamination splits passage opening and closing is unrestricted in theory.
Claims (2)
1. the unlimited solvable ball fracturing sliding bush of full-bore, be made up of some grades of slide bushing assemblies and several solvable balls, the latus rectum of slide bushing assembly at different levels increases from bottom to up successively, every one-level slide bushing assembly is at least equipped with the solvable ball of a corresponding external diameter, every one-level slide bushing assembly comprises main body, distinguish ball seat, spring, rotation sliding sleeve and bearing, it is characterized in that:
Described main body is cylindric, the first half of main body inner wall is provided with reducer, this reducer is divided into again extension diameter section and undergauge section from top to bottom, the latter half of main body inner wall circumferentially arranges class zigzag slideway, such each unit of zigzag slideway, comprises flex point, lower flex point, up slideway and descending slideway, and the below of main body circumferentially arranges some external pressure ceasmas, the lower end of body lumen arranges step, and step has rolling bearing with main body interference fit;
Described distinguish ball seat, its matrix is annulus shell-like, be placed in main body, distinguish ball seat matrix circumferentially top extension is provided with some ball pawls, arranges the lock ball step for accepting solvable ball inside each ball pawl, pitching builds the pressure, distinguish ball seat is descending along main body, and during extension diameter section by reducer, ball pawl radial dilatation strengthens gradually, when walking to undergauge section, solvable ball falls from lock ball step; The below of distinguish ball seat circumferentially arranges some strip longitudinal sockets and uniform some pins, and pin is inserted in the class zigzag slideway in main body;
Described rotation sliding sleeve, its matrix is annulus shell-like, be seated on the rolling bearing in main body, rotation sliding sleeve circumferentially top extension is provided with some strip connecting rods, strip connecting rod is plugged in the longitudinal socket of distinguish ball seat, connecting rod root rotates between the upper surface of sliding sleeve and the lower surface of distinguish ball seat goes back fixing spring, spring in the raw time, pin on the height stand distinguish ball seat of spring is sitting at the upper flex point place of class sawtooth slideway, and the insertion depth of connecting rod is less than the degree of depth of longitudinal socket; Rotate circumferentially be provided with below sliding sleeve equal with external pressure ceasma quantity in pressure break hole, the center of interior pressure break hole and external pressure ceasma is in same level, during pressure break pathway closure, interior pressure break hole is equal with the angle that two adjacent upper flex point phase places of class zigzag slideway differ with the angle that external pressure ceasma phase place differs.
2. the unlimited solvable ball fracturing sliding bush of full-bore according to claim 1, it is characterized in that: the quantity of described interior pressure break hole and external pressure ceasma is respectively 2, interior pressure break hole differs 90 ° with in external pressure ceasma phase place, and class sawtooth slideway element number is 4.
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