CN104234683A - Reducing mechanism - Google Patents
Reducing mechanism Download PDFInfo
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- CN104234683A CN104234683A CN201410463178.XA CN201410463178A CN104234683A CN 104234683 A CN104234683 A CN 104234683A CN 201410463178 A CN201410463178 A CN 201410463178A CN 104234683 A CN104234683 A CN 104234683A
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- 238000003032 molecular docking Methods 0.000 claims description 5
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- 229910000831 Steel Inorganic materials 0.000 abstract description 35
- 239000010959 steel Substances 0.000 abstract description 35
- 238000010276 construction Methods 0.000 abstract description 11
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000008520 organization Effects 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of oil and gas field reservoir modification equipment, and discloses a reducing mechanism. Reciprocating movement of a sliding sleeve center pipe can be realized through cooperation of a sliding sleeve with a reducing area, the sliding sleeve center pipe and a track pipe, and the reciprocating movement times of the sliding sleeve center pipe are determined by a track groove in a track plate. The reducing mechanism is applied to a casing sliding sleeve for use in fracturing construction; the quantity of steel balls which are allowed to pass through each grade of sliding sleeve switch is set by designing the track groove of the track pipe and position of a pin in the track pipe, so that gradual switch-on of the sliding sleeve switch is realized.
Description
Technical field
The present invention relates to oil gas field reservoir reconstruction equipment technical field, be specially a kind of diameter changing mechanism.
Background technology
Small borehole bushing sliding sleeve well-completing process has the plurality of advantages such as shaft building cost is low, the cycle is short, pressure break scale is large may become domestic ultra-low penetration oil field gas well oil as the main completion mode of gas well straight well, directional well.
The sliding sleeve of bushing being applicable to slim-hole at present mainly contains the limited ball-throwing type casing valve of progression and throws " infinitely " level casing valve of dartlike weapon formula." infinitely " level sliding sleeve of bushing throwing dartlike weapon formula has the many advantages of progression, but this sliding sleeve of bushing complex structure, and instrument cost is high, opens at the bottom of success rate.Schlumberger and An Dong oil dartlike weapon formula infinite stages sliding sleeve of bushing also do not possess scale service condition at present.
The casing valve that ball-throwing type is opened has opens high, the instrument low cost and other advantages of success rate, is widely used.The sliding sleeve of bushing used is reducing pitching, and the ball namely throwing different size opens multistage sliding sleeve from bottom to top step by step, and the internal diameter of multistage sliding sleeve needs to increase step by step.But current well completion of casing sliding sleeve mainly uses 3.5 inches of sleeve pipes, larger by inside/outside diameter size restriction, this kind of casing valve is subject to the restriction of latus rectum in tubing string, 2 grades can only be accomplished for the sleeve pipe of 3.5 cun at present meeting under cementing conditions, realize 3 layers of pressing crack construction, be difficult to the exploitation adapting to multilayer system.But the distribution of gas field gas-bearing formation is the distribution of multilayer system, and this kind of sliding sleeve of bushing can not meet the needs of engineering, need to break through to more multistage number.
The backwardness of casing valve technology hinders petroleum resources to a certain extent and better exploits.Therefore, the exploitation designing and developing ball-throwing type multilayer system's sliding sleeve of bushing and mechanical type " infinitely " level sliding sleeve of bushing is necessary.Its technological difficulties are that the ball how realized by throwing a specification realizes opening level sliding sleeve step by step.
Summary of the invention
In order to solve 3.5 inches of sleeve pipes that current well completion of casing sliding sleeve uses, larger by inside/outside diameter size restriction, for the sliding sleeve of bushing of reducing pitching, two-stage can only be connect at most and transform 3 layers, be difficult to the technical problem of exploitation adapting to multilayer system, the sliding sleeve of bushing that the present invention is directed to small diameter borehole devises a kind of sliding sleeve, track pad and the diameter changing mechanism with reducing district.
An object of the present invention is to provide a kind of sliding sleeve and the sliding sleeve central tube with reducing district, and ball seat can realize expanding in the reducing district of this sliding sleeve.
Two of object of the present invention is to provide a kind of track pipe, and this track pad can lead, and the parts that move along its track groove are unidirectional interiorly to move.
Three of object of the present invention is to provide a kind of diameter changing mechanism, is coordinated, can realize the reciprocating motion of sliding sleeve by the sliding sleeve in reducing district with track pipe.Comprise the multistage sliding sleeve switch of this diameter changing mechanism, the ball throwing in multiple a kind of specification from well head successively can be realized, realize opening multiple underground sliding bush switching step by step from bottom to top, and then realize the successively pressing crack construction of layering from bottom to top.
The technical solution used in the present invention is: a kind of diameter changing mechanism, comprises sleeve pipe, is set with and has reducing district sliding sleeve, be also arranged with sliding sleeve central tube in described sliding sleeve in described sleeve pipe, described sliding sleeve central tube is provided with a position-limitting pin extended along tube wall radial direction; Sliding sleeve central tube upper end is placed in the reducing district of sliding sleeve;
Described sliding sleeve lower end is also arranged with sleeve base, and the lower end end of sliding sleeve central tube is placed in sleeve base, forms cavity between sliding sleeve lower end and sliding sleeve central tube;
Be arranged with track pipe in described cavity, the body of described track pipe offers around the tortuous track groove extended of body circumference, the free end of position-limitting pin is placed in the track groove of track pipe;
Spring is placed with vertically between described sliding sleeve central tube and track tube wall.
There is the sliding sleeve in reducing district, comprise sliding sleeve body, in the upstream end port of this sliding sleeve body, be provided with annular protrusion;
The end that this protuberance extends internally along the axis of sliding sleeve body, the expanding district of annular for outwards caving in sliding sleeve body footpath, the inner surface in this annular expanding district is arc-shaped concave or arc sphere.
A kind of sliding sleeve central tube, described sliding sleeve central tube tube wall outer wall is provided with a projection, this projection lateral surface is provided with a position-limitting pin extended along tube wall radial direction.
A kind of track pipe, comprise body, it is characterized in that: described body offers around the tortuous track groove extended of body circumference, described track groove comprises multiple axial track section staggered being up and down parallel to body axis, and adjacent axial track section is communicated with by the first oblique orbit segment;
The inner side edge of the adjacent first oblique orbit segment connects thus forms " V " zag trajectory groove section, and each first oblique orbit segment is equal with the angle of body axis;
Described multiple axial track section comprises initial axial track section, end axial track section and multiple jackshafts of being placed between this initial axial track section, end axial track section to orbit segment;
Initial axial track section extends along the axial straight line of body, and its dual-side is parallel, and dual-side is connected towards track tube end side by cylindrical segmental arc; Jackshaft comprises the hypotenuse of the side parallel docking of orbit segment oblique with first and the straight flange axially parallel with body to the axial rail section of orbit segment and end, and this straight flange closes on axial track section side, end, and straight flange is connected by cylindrical segmental arc with hypotenuse connecting portion; The straight flange of the axial rail section in described end is connected by cylindrical segmental arc with the outer side edges connecting portion of adjacent first oblique orbit segment;
The connecting portion of the inner side edge of the adjacent first oblique orbit segment is connected by inner circle segmental arc, the center line of described inner circle segmental arc and the center line of each axial track section not conllinear and be partial to initial axial track section.
In a kind of track pipe, further, the straight flange of described end axial track section is parallel with the outer side edges of the second oblique orbit segment to connect, and the inner side edge side of the second oblique orbit segment connects with the outer side edges of adjacent first oblique orbit segment, and the second oblique orbit segment length is less than the first oblique orbit segment.
In a kind of diameter changing mechanism, further, the number of diameter changing of described diameter changing mechanism is determined by the limit point number of the track groove of track pipe.
Further, be also arranged with reducing ball seat in the annular protrusion of described sliding sleeve, described reducing ball seat is positioned at end, sliding sleeve annular protrusion upper end.
Described reducing ball seat is " C " global seat.
Or described reducing ball seat is distinguish slips ball seat.
Beneficial effect of the present invention: a kind of diameter changing mechanism of the present invention, coordinated with the track groove on track pipe by sliding sleeve, the sliding sleeve central tube with reducing district, can realize the reciprocating motion of sliding sleeve central tube, the reciprocating number of times of sliding sleeve central tube is determined by track groove on track pad.This diameter changing mechanism is used in the ball-throwing type casing valve of pressing crack construction, the ball by throwing in multiple a kind of specification successively from well head can be realized, realize opening multiple underground sliding bush switching step by step from bottom to top, and then realize the successively pressing crack construction of layering from bottom to top, improve efficiency of construction.The number of times that ball passes through can be preset, and in same tubing string, the chance ball number of pass times of sliding sleeve switch is from bottom to top respectively 0,1,2,3 ... secondary, when sliding sleeve switch chance ball number of pass times is 0, can open sliding sleeve switch.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described, but they do not form restriction to the present invention.
Fig. 1 is the shift sleeve structure schematic diagram with reducing district.
Fig. 2 is sliding sleeve center tube structure schematic diagram.
Fig. 3 is that Local map is launched in track tubular axis side.
Fig. 4 is that Local map is launched in the axle side of the another kind of embodiment of track pipe.
Fig. 5 is diameter changing mechanism structural representation.
Fig. 6 is that diameter changing mechanism is for the structural representation in casing valve.
Fig. 7 is the schematic diagram of steel ball by undergauge district.
Fig. 8 is the schematic diagram of steel ball by expanding district.
Fig. 9 is multistage shift sleeve structure schematic diagram.
Figure 10 is that Local map is launched in third level sliding sleeve track tubular axis side.
Figure 11 is that Local map is launched in sliding sleeve track tubular axis side, the second level.
Figure 12 is that Local map is launched in first order sliding sleeve track tubular axis side.
In figure: 1, top connection; 2, sleeve pipe; 3, reducing ball seat; 4, sliding sleeve 5, sliding sleeve central tube; 6, sliding sleeve shear pin; 7, position-limitting pin; 8, track pipe; 9, spring; 10, sleeve base; 11, central tube shear pin; 12, lower contact; 13, steel ball; 14 undergauge districts; 15 expanding districts; 16 axial track sections; 17, oblique orbit segment; 18, initial axial track section; 19, jackshaft is to orbit segment; 20, end axial track section; 21, cylindrical segmental arc; 22, hypotenuse; 23, straight flange; 24, inner circle segmental arc; 25, the second oblique orbit segment; 26, inner side edge; 27, outer side edges.
Detailed description of the invention
Upper and lower described in way of example, to well head direction be upper, to direction, shaft bottom be under, described front end, close upper extreme direction is front, and described end is end, lower end, except track pipe 8, described inside and outside, be outward along sleeve pipe radial direction to tube wall direction, in being along sleeve pipe radial direction to tube wall rightabout.
For realizing in pressing crack construction, the ball that ball-throwing type casing valve can throw same specification realizes opening multiple underground sliding bush switching step by step from bottom to top, and then realizes the successively pressing crack construction of layering from bottom to top, provides a kind of for a kind of diameter changing mechanism in casing valve.Be specifically described by embodiment 1 to 5 respectively.
embodiment 1
A kind of diameter changing mechanism, comprises sleeve pipe, is set with and has reducing district sliding sleeve 4, be also arranged with sliding sleeve central tube 5 in described sliding sleeve 4 in described sleeve pipe 2, described sliding sleeve central tube 5 is provided with a position-limitting pin 7 extended along tube wall radial direction; Sliding sleeve central tube 5 upper end is placed in the reducing district of sliding sleeve 4;
Described sliding sleeve 4 lower end is also arranged with sleeve base 10, and the lower end end of sliding sleeve central tube 5 is placed in sleeve base 10, forms cavity between sliding sleeve 4 lower end and sliding sleeve central tube 5;
Be arranged with track pipe 8 in described cavity, the body of described track pipe 8 offers around the tortuous track groove extended of body circumference, the free end of position-limitting pin 7 is placed in the track groove of track pipe 8;
Spring 9 is placed with vertically between described sliding sleeve central tube 5 and track pipe 8 tube wall.
The structural representation of its a kind of detailed description of the invention as shown in Figure 4.
embodiment 2
As a kind of preferred version of embodiment 1, the sliding sleeve 4 with reducing district in a kind of diameter changing mechanism, its structural representation as shown in Figure 1.Comprise sliding sleeve 4 body, this sliding sleeve 4 body in upstream end port, be provided with annular protrusion;
The end that this protuberance extends internally along the axis of sliding sleeve 4 body, the expanding district 15 of annular for outwards caving in sliding sleeve 4 body footpath, the inner surface in this annular expanding district 15 is arc-shaped concave or arc sphere.
The annular protrusion of described sliding sleeve 4 is reducing district, and front end, reducing district is annular undergauge district 14, and end is annular expanding district 15, and undergauge district 14 diameter is less than expanding district 15 diameter.In the present embodiment, the diameter of steel ball 13 is greater than the diameter in sliding sleeve 4 undergauge district 14 and is less than the diameter in the expanding district 15 of sliding sleeve 4.
embodiment 3
As a kind of preferred version of embodiment 1, sliding sleeve central tube 5 in a kind of diameter changing mechanism, as shown in Figure 2, described sliding sleeve central tube 5 comprises tube wall to its structural representation, described tube wall outer wall is provided with a projection, this projection lateral surface is provided with a spacer pin 7 extended along tube wall radial direction.
The sliding sleeve central tube 5 of the present embodiment can be sheathed in the sliding sleeve 4 with reducing district of embodiment 1, and can move up and down vertically in sliding sleeve 4 body with reducing district.
embodiment 4
As a kind of preferred version of embodiment 1, track pipe 8 in a kind of diameter changing mechanism, comprise body, described body offer around the tortuous track groove extended of body circumference, described track groove comprises multiple axial track section 16 staggered being up and down parallel to body axis, and adjacent axial track section is communicated with by the first oblique orbit segment 17;
The inner side edge 26 of the adjacent first oblique orbit segment 17 connects thus forms " V " zag trajectory groove section, and each first oblique orbit segment 17 is equal with the angle of body axis;
Described multiple axial track section 16 comprises initial axial track section 18, end axial track section 20 and multiple jackshafts of being placed between this initial axial track section 18, end axial track section 20 to orbit segment 19;
Initial axial track section 18 extends along the axial straight line of body, and its dual-side is parallel, and dual-side is connected towards side, track pipe 8 end by cylindrical segmental arc 21; Jackshaft comprises the hypotenuse 22 of the side parallel docking of orbit segment 17 oblique with first and the straight flange 23 axially parallel with body to the axial rail section 20 of orbit segment 19 and end, and this straight flange 23 closes on axial track section 20 side, end, straight flange 23 is connected by cylindrical segmental arc 21 with hypotenuse 22 connecting portion; The straight flange 23 of the axial rail section 20 in described end is connected by cylindrical segmental arc 21 with outer side edges 27 connecting portion of adjacent first oblique orbit segment 17;
The connecting portion of the inner side edge 26 of the adjacent first oblique orbit segment 17 is connected by inner circle segmental arc 24, the center line of described inner circle segmental arc 24 and the center line of each axial track section 16 not conllinear and be partial to initial axial track section 18.
The part axle side expanded view of track pipe 8 as shown in Figure 3.
Preferred as another kind, the end axial track section of the track groove of the track pipe 8 of the present embodiment can also be, the straight flange 23 of described end axial track section 20 is parallel with the outer side edges 27 of the second oblique orbit segment 25 to connect, the inner side edge 26 of the second oblique orbit segment 25 connects with the outer side edges 27 of adjacent first oblique orbit segment 17, and the second oblique orbit segment 25 length is less than the first oblique orbit segment 17, the part axle side expanded view of the track pipe 8 of this preferred version as shown in Figure 4.
The track groove of the track pipe 8 of the present embodiment, the spacer pin 7 that can retrain in the projection being placed in sliding sleeve central tube 5 of embodiment 2 does one-way movement along the axis of sliding sleeve 4.
embodiment 5
The present embodiment is on the basis of embodiment 1 ~ 4, as one preferred embodiment, provide a kind of comprise above-mentioned there is reducing district sliding sleeve, sliding sleeve central tube, track pipe diameter changing mechanism, comprise sleeve pipe 2, be set with in described sleeve pipe 2 and there is reducing district sliding sleeve 4, described sliding sleeve 4 body in upstream end port, be provided with annular protrusion; The end that this protuberance extends internally along the axis of sliding sleeve body 4, the expanding district 15 of annular for outwards caving in sliding sleeve body 4 footpath, the inner surface in this annular expanding district 15 is arc-shaped concave or arc sphere;
Also be arranged with sliding sleeve central tube 5 in described sliding sleeve 4, the tube wall outer wall of described sliding sleeve central tube 5 is provided with a projection, this projection lateral surface is provided with a spacer pin 7 extended along tube wall radial direction; Sliding sleeve central tube 5 upper end is placed in the annular protrusion of sliding sleeve 4, its projection next-door neighbour sliding sleeve 4 annular protrusion lower surface;
Described sliding sleeve 4 lower end is also arranged with sleeve base 10, and the lower end end of sliding sleeve central tube 5 is placed in sleeve base 10, forms cavity between sliding sleeve 4 lower end and sliding sleeve central tube 5;
Be arranged with track pipe 8 in described cavity, the body of described track pipe 8 offers around the tortuous track groove extended of body circumference, the free end of spacer pin 7 is placed in the track groove of track pipe 8;
Described track groove comprises multiple axial track section 16 staggered being up and down parallel to body axis, and adjacent axial track section is communicated with by the first oblique orbit segment 17;
The inner side edge 26 of the adjacent first oblique orbit segment 17 connects thus forms " V " zag trajectory groove section, and each first oblique orbit segment 17 is equal with the angle of body axis;
Described multiple axial track section 16 comprises initial axial track section 18, end axial track section 20 and multiple jackshafts of being placed between this initial axial track section 18, end axial track section 20 to orbit segment 19;
Initial axial track section 18 extends along the axial straight line of body, and its dual-side is parallel, and dual-side is connected towards side, track pipe 8 end by cylindrical segmental arc 21; Jackshaft comprises the hypotenuse 22 of the side parallel docking of orbit segment 17 oblique with first and the straight flange 23 axially parallel with body to the axial rail section 20 of orbit segment 19 and end, and this straight flange 23 closes on axial track section 20 side, end, straight flange 23 is connected by cylindrical segmental arc 21 with hypotenuse 22 connecting portion; The straight flange 23 of the axial rail section 20 in described end is connected by cylindrical segmental arc 21 with outer side edges 27 connecting portion of adjacent first oblique orbit segment 17;
The connecting portion of the inner side edge 26 of the adjacent first oblique orbit segment 17 is connected by inner circle segmental arc 24, the center line of described inner circle segmental arc 24 and the center line of each axial track section 16 not conllinear and be partial to initial axial track section 18.
Spring 9 is placed with vertically between described sliding sleeve central tube 5 and track pipe 8 tube wall.
As shown in Figure 5, the part axle side expanded view of its track pipe 8 as shown in Figure 3 for its structural representation.
Preferred as another kind, in the present embodiment track pipe 8 the end axial track section of track groove can also be, the straight flange 23 of described end axial track section 20 is parallel with the outer side edges 27 of the second oblique orbit segment 25 to connect, the inner side edge 26 of the second oblique orbit segment 25 connects with the outer side edges 27 of adjacent first oblique orbit segment 17, and the second oblique orbit segment 25 length is less than the first oblique orbit segment 17, the part axle side expanded view of its track pipe 8 as shown in Figure 4.
Diameter changing mechanism in the present embodiment, position-limitting pin 7 is constrained in the track groove of track pipe 8, and when applying first downwards power more upwards, position-limitting pin 7 one-way movement vertically, track pipe 8 rotates simultaneously.Coordinated with the track groove on track pipe 8 by sliding sleeve 4, the sliding sleeve central tube 5 with reducing district, the reciprocating motion of sliding sleeve central tube 5 can be realized, the number of diameter changing of described diameter changing mechanism is determined by the limit point number of the track groove of track pipe 8, and namely the reciprocating number of times of sliding sleeve central tube 5 is determined by track groove on track pad.
embodiment 6
The present embodiment, on the basis of the diameter changing mechanism of embodiment 5, is also arranged with reducing ball seat 3 in the annular protrusion of described sliding sleeve 4, and described reducing ball seat 3 is positioned at end, sliding sleeve 4 annular protrusion upper end.
In the present embodiment, described reducing ball seat 3 is " C " global seat or distinguish slips ball seat.
The reducing ball seat 3 of the diameter changing mechanism of the present embodiment is positioned at the undergauge district 14 of sliding sleeve 4, and when in the expanding district 15 that reducing ball seat 3 moves to sliding sleeve 4, reducing ball seat 3 realizes reducing at expanding district intramedullary expansion.
embodiment 7
When diameter changing mechanism in embodiment 1,5 or 6 is used for sliding sleeve of bushing, its structural representation as shown in Figure 6.Comprise top connection 1, top connection 1 lower end is connected with sleeve pipe 2, and described sleeve pipe 2 lower end is connected with lower contact 12, and described sleeve pipe 2 upper end tube wall offers fluid hole, also comprise reducing ball seat and controlling organization thereof, described reducing ball seat is close to top connection 1 lower surface and is set in sliding sleeve 4; Described controlling organization comprises sliding sleeve 4, sliding sleeve central tube 5, shear pin 6, position-limitting pin 7, track pipe 8 and spring 9;
Described sliding sleeve 4 is close to top connection 1 lower end and is sleeved in sleeve pipe 2, is equipped with the first shear pin 6 between sliding sleeve 4 and sleeve pipe 2, and described first shear pin 6 is positioned at the fluid hole lower end of sleeve pipe 2; Described in described sliding sleeve 4, sliding sleeve 4 body is provided with annular protrusion in upstream end port; The end that this protuberance extends internally along the axis of sliding sleeve body 4, the expanding district 15 of annular for outwards caving in sliding sleeve body 4 footpath, the inner surface in this annular expanding district 15 is arc-shaped concave or arc sphere;
Also be arranged with sliding sleeve central tube 5 in described sliding sleeve 4, the tube wall outer wall of described sliding sleeve central tube 5 is provided with a projection, this projection lateral surface is provided with a spacer pin 7 extended along tube wall radial direction; Sliding sleeve central tube 5 upper end is placed in the annular protrusion of sliding sleeve 4, its projection next-door neighbour sliding sleeve 4 annular protrusion lower surface;
Described sliding sleeve 4 lower end is also arranged with sleeve base 10, and the lower end end of sliding sleeve central tube 5 is placed in sleeve base 10, forms cavity between sliding sleeve 4 lower end and sliding sleeve central tube 5;
Also be arranged with track pipe 8 in described cavity, the body of described track pipe 8 offers around the tortuous track groove extended of body circumference, the free end of spacer pin 7 is placed in the track groove of track pipe 8;
Described track groove comprises multiple axial track section 16 staggered being up and down parallel to body axis, and adjacent axial track section is communicated with by the first oblique orbit segment 17;
The inner side edge 26 of the adjacent first oblique orbit segment 17 connects thus forms " V " zag trajectory groove section, and each first oblique orbit segment 17 is equal with the angle of body axis;
Described multiple axial track section 16 comprises initial axial track section 18, end axial track section 20 and multiple jackshafts of being placed between this initial axial track section 18, end axial track section 20 to orbit segment 19;
Initial axial track section 18 extends along the axial straight line of body, and its dual-side is parallel, and dual-side is connected towards side, track pipe 8 end by cylindrical segmental arc 21; Jackshaft comprises the hypotenuse 22 of the side parallel docking of orbit segment 17 oblique with first and the straight flange 23 axially parallel with body to the axial rail section 20 of orbit segment 19 and end, and this straight flange 23 closes on axial track section 20 side, end, straight flange 23 is connected by cylindrical segmental arc 21 with hypotenuse 22 connecting portion; The straight flange 23 of the axial rail section 20 in described end is connected by cylindrical segmental arc 21 with outer side edges 27 connecting portion of adjacent first oblique orbit segment 17;
The connecting portion of the inner side edge 26 of the adjacent first oblique orbit segment 17 is connected by inner circle segmental arc 24, the center line of described inner circle segmental arc 24 and the center line of each axial track section 16 not conllinear and be partial to initial axial track section 18.Described track groove comprises multiple axial track section staggered being up and down parallel to body axis, and adjacent axial track section is communicated with by the first oblique orbit segment; The inner side edge of the adjacent first oblique orbit segment connects thus forms " V " zag trajectory groove section, and each first oblique orbit segment is equal with the angle of body axis.
Spring 9 is placed with vertically between described sliding sleeve central tube 5 and track pipe 8 tube wall.
Described sleeve base 10 end and sliding sleeve central tube 5 end are also equipped with the second shear pin 11.
Second shear pin 11 for control without spherical state low sleeve slide downward.
The present embodiment is for the sliding sleeve of bushing of small diameter borehole, the diameter changing mechanism of embodiment 1,5 or 6 is applied in sliding sleeve of bushing, devise one " ball is opened more " formula sliding sleeve switch, this sliding sleeve switch indoor design has " meet ball pass through " mechanism, the number of times that chance ball passes through can be preset, in same tubing string, the chance ball number of pass times of sliding sleeve switch is from bottom to top respectively 0,1,2,3 ... secondary, when sliding sleeve switch chance ball number of pass times is 0, can open sliding sleeve switch.This sliding sleeve switch, by throwing in the ball of multiple a kind of specification successively from well head, realizes opening multiple underground sliding bush switching step by step from bottom to top, and then realizes the successively pressing crack construction of layering from bottom to top.
embodiment 8
The sliding sleeve switch of embodiment 7, its specific works principle is: as shown in Figure 7, the diameter of steel ball 13 is greater than sliding sleeve 4 undergauge district 14 diameter and is less than expanding district 15 diameter, reducing ball seat 3 is sheathed in the undergauge district 14 of sliding sleeve 4, sliding sleeve 4 pairs of reducing ball seats 3 apply radial constraint, make reducing ball seat 3 can not radial dilatation, reducing ball seat 3 stores the elastic potential energy of radial dilatation simultaneously.When steel ball 13 is seated on reducing ball seat 3, when applying certain pressure, steel ball 13, reducing ball seat 3 come downwards to the expanding position of internal diameter of sliding sleeve 4 together in company with sliding sleeve central tube 5, namely undergauge district 14 end expanding district 15, this section of stroke be steel ball 13 by stroke, be labeled as L
pass through, i.e. L
pass throughfor ball seat is to the distance of the entrance in the expanding district 14 of sliding sleeve 4.As shown in Figure 8, after reducing ball seat 3 loses the radial constraint of sliding sleeve 4, radial dilatation under the elastic potential energy effect of self, reducing ball seat 3 internal diameter becomes and makes greatly steel ball 13 by reducing ball seat 3, and now steel ball 13 enters tool string below by sliding sleeve switch.When steel ball 13 is by after reducing ball seat 3, make reducing ball seat 3 and sliding sleeve central tube 5 go upward to initial position under the effect of spring 9, reducing ball seat 3 is again closed recovers original internal diameter.
embodiment 9
The sliding sleeve switch of embodiment 7, this sliding sleeve switch is designed with " meet ball pass through " controlling organization, sets forth below in conjunction with accompanying drawing 3,4 and 6.The distance that reducing ball seat 3 moves axially in sliding sleeve 4 is determined by pin 7 axial displacement in track pipe 8.As shown in Figure 6, pin 7 through the track groove of track pipe 8, and is fixed in the hole of sliding sleeve central tube 5, and namely one end of pin 7 is positioned in the track groove of track pipe 8, and as shown in Figure 3, Figure 4, the other end is fixed in the aperture of sliding sleeve central tube 5 track groove.Pin 7 moves along with moving axially of sliding sleeve central tube 5, and pin 7 moves in the track groove of track pipe 8, and track pipe 8 can axial rotation.Sliding sleeve switch by steel ball quantity determined by the limit point number of the track groove of track pipe 8, concrete number as required pressure break progression and determine, simultaneously the number of track pipe 8 limit point is by the restriction of sleeve pipe 2 external diameter.
In the present embodiment, open three grades of sliding sleeves for a ball, in shown track groove, be distributed with multiple limit point such as A, B, C, D, E, F.Suppose the C point of the initial position of pin 7 in track groove, as shown in figure 11, steel ball 13 is seated on reducing 3, under the effect of the pressure, reducing ball seat 3 drives sliding sleeve central tube 5 to move down, and sliding sleeve central tube 5 drives pin 7 to move in track groove, moves to D point by C point.Now from top connection 1, track pipe 8 is for rotating counterclockwise.Axial stroke L1 is produced by C → D point by pin 7, and L1=L
pass through(L
pass throughfor reducing ball seat 3 is to the distance of the entrance in the expanding district 15 of sliding sleeve 4), as shown in Figure 3.Namely pin 7 is from C → D point, and the expanding district 15 that reducing ball seat 3 enters sliding sleeve 4 is expanding, and ball can be made to pass through sliding sleeve switch.
When steel ball 13 is by after sliding sleeve switch, under the elastic potential energy effect of spring 9, spring 9 promotes sliding sleeve central tube 5, reducing ball seat 3 and pin 7 and resets, pin 7 when reset by D → E point.Now from top connection 1, track pipe 8 is for rotating clockwise.When pin 7 is at E point, axial stroke L2 can be produced by E → F point.Due to L2<L
pass through, now reducing ball seat 3 cannot arrive the expanding district 15 of sliding sleeve 4, can not radial dilatation, and steel ball 13 is not by sliding sleeve switch.
embodiment 10
The sliding sleeve switch of embodiment 7, the sliding sleeve switch of multiple same specification (sliding sleeve switch of same specification refers to that the physical dimension of ball seat is the same) opened from bottom to top step by step by the steel ball 13 that can realize throwing multiple same specification.On the basis of embodiment 1 ~ 9, set forth in conjunction with sliding sleeve of bushing example, the sliding sleeve switch opening 3 same specifications for the ball of a specification is set forth, and the schematic diagram of pin 7 movement in track pipe 8 when pipeline is opened step by step is as shown in Figure 10,11,12.
In down-hole string, the sliding sleeve switch of same specification is labeled as I grade, II grade and III grade from bottom to top respectively, as shown in Figure 9.The initial position of the pin 7 of I grade, II grade and the III grade sliding sleeve switch in down-hole is arranged on E, C, A point, as shown in Figure 10,11,12.
When throwing first steel ball 14 from well head: first steel ball 14 arrives on reducing 3 ball seat of III grade of sliding sleeve switch, add pressing steel balls 13 by III grade of sliding sleeve switch, the pin 7 of III grade of sliding sleeve switch is by A → B → C point simultaneously; Then steel ball 13 reaches the reducing ball seat 3 of II grade of sliding sleeve switch, adds pressing steel balls 13 by II grade of sliding sleeve switch, and the pin 7 of II grade of sliding sleeve switch is by C → D → E simultaneously; Steel ball 13 falls on the reducing ball seat of I grade of sliding sleeve switch, during pressurization, pin can only by E → F, axial stroke due to pin is less than passes through stroke needed for steel ball 13, steel ball 13 is not by I grade of sliding sleeve switch, continue pressurization, cut off shear pin 6, the fluid hole of sliding sleeve 4, sliding sleeve central tube 5, pin 7, track pipe 8, spring 9, sleeve base 10 whereabouts shutoff I grade of its lower end together, open the fluid hole of sleeve pipe 2, I grade of sliding sleeve switch is opened.
When throwing second steel ball 13 from well head: first steel ball 13 arrives on the reducing ball seat 3 of III grade of sliding sleeve switch, add pressing steel balls 13 by III grade of sliding sleeve switch, the pin 7 of III grade of sliding sleeve switch is by C → D → E point simultaneously; Then II steel ball 13 reaches the reducing ball seat 3 of II grade of sliding sleeve switch, pressurization, pin can only by E → F, axial stroke due to pin be less than needed for steel ball 13 by stroke, steel ball 13 not by II grade of sliding sleeve switch, continue pressurization, cut off shear pin 6, the fluid hole of sliding sleeve 4, sliding sleeve central tube 5, pin 7, track pipe 8, spring 9, sleeve base 10 whereabouts shutoff II grade of its lower end together, opens the fluid hole of sleeve pipe 2, and II grade of sliding sleeve switch is opened.
When throwing the 3rd steel ball 13 from well head: first steel ball 13 arrives on the reducing ball seat 3 of III grade of sliding sleeve switch, pressurization, pin can only by E → F, axial stroke due to pin be less than needed for steel ball 13 by stroke, steel ball 13 not by III grade of sliding sleeve switch, continue pressurization, cut off shear pin 6, the fluid hole of sliding sleeve 4, sliding sleeve central tube 5, pin 7, track pipe 8, spring 9, sleeve base 10 whereabouts shutoff III grade of its lower end together, opens the fluid hole of sleeve pipe 2, and III grade of sliding sleeve switch is opened; Now can carry out pressing crack construction by the interval corresponding to this sliding sleeve switch.
The present embodiment solves 3.5 inches of sleeve pipes that current well completion of casing sliding sleeve uses, larger by inside/outside diameter size restriction, for the sliding sleeve of bushing of reducing pitching, two-stage can only be connect at most and transform 3 layers, be difficult to the technical problem of the exploitation adapting to multilayer system, by throwing in the ball of multiple a kind of specification successively from well head, realize opening multiple underground sliding bush switching step by step from bottom to top, and then realize the successively pressing crack construction of layering from bottom to top.
The parts that above embodiment does not describe in detail and structure belong to the well-known components of the industry and common structure or conventional means, do not describe one by one here.
Above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although describe in detail in addition the present invention with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. a diameter changing mechanism, comprise sleeve pipe (2), it is characterized in that: be set with in described sleeve pipe (2) and there is reducing district sliding sleeve (4), also be arranged with sliding sleeve central tube (5) in described sliding sleeve (4), described sliding sleeve central tube (5) be provided with a position-limitting pin (7) extended along tube wall radial direction; Sliding sleeve central tube (5) upper end is placed in the reducing district of sliding sleeve (4);
Described sliding sleeve (4) lower end is also arranged with sleeve base (10), and the lower end end of sliding sleeve central tube (5) is placed in sleeve base (10), forms cavity between sliding sleeve (4) lower end and sliding sleeve central tube (5);
Be arranged with track pipe (8) in described cavity, the body of described track pipe (8) offers around the tortuous track groove extended of body circumference, the free end of position-limitting pin (7) is placed in the track groove of track pipe (8);
Spring (9) is placed with vertically between described sliding sleeve central tube (5) and track pipe (8) tube wall.
2. a kind of diameter changing mechanism as claimed in claim 1, is characterized in that: described in there is reducing district sliding sleeve (4) comprise sliding sleeve (4) body, be provided with annular protrusion in the upstream end port of described sliding sleeve (4) body; The end that this protuberance extends internally along the axis of sliding sleeve (4) body is the expanding district of annular (15) of outwards caving in sliding sleeve (4) body footpath, and the inner surface of this annular expanding district (15) is arc-shaped concave or arc sphere.
3. a kind of diameter changing mechanism as claimed in claim 1, is characterized in that: the tube wall outer wall of described sliding sleeve central tube (5) is provided with a projection, this projection lateral surface is provided with a position-limitting pin (7) extended along tube wall radial direction.
4. a kind of diameter changing mechanism as claimed in claim 1, it is characterized in that:: the body of described track pipe (8) offer around the tortuous track groove extended of body circumference, described track groove comprises multiple axial track section (16) staggered being up and down parallel to body axis, and adjacent axial track section is communicated with by the first oblique orbit segment (17);
The inner side edge (26) of the adjacent first oblique orbit segment (17) connects thus forms " V " zag trajectory groove section, and each first oblique orbit segment (17) is equal with the angle of body axis;
Described multiple axial track section (16) comprise initial axial track section (18), end axial track section (20) and multiple jackshafts of being placed between this initial axial track section (18), end axial track section (20) to orbit segment (19);
Initial axial track section (18) extends along the axial straight line of body, and its dual-side is parallel, and dual-side is connected towards track pipe (8) side, end by cylindrical segmental arc (21); Jackshaft comprises the hypotenuse (22) of the side parallel docking of orbit segment (17) oblique with first and the straight flange (23) axially parallel with body to axial rail section (20) of orbit segment (19) and end, and this straight flange (23) closes on axial track section (20) side, end, straight flange (23) is connected by cylindrical segmental arc (21) with hypotenuse (22) connecting portion; The axial straight flange (23) of rail section (20) in described end is connected by cylindrical segmental arc (21) with outer side edges (27) connecting portion of adjacent first oblique orbit segment (17);
The connecting portion of the inner side edge (26) of the adjacent first oblique orbit segment (17) is connected by inner circle segmental arc (24), the center line of described inner circle segmental arc (24) and the center line of each axial track section (16) not conllinear and be partial to initial axial track section (18).
5. a kind of diameter changing mechanism as claimed in claim 4, it is characterized in that: the straight flange (23) of described end axial track section (20) is parallel with the outer side edges (27) of the second oblique orbit segment (25) to connect, the inner side edge (26) of the second oblique orbit segment (25) connects with the outer side edges (27) of adjacent first oblique orbit segment (17), and the second oblique orbit segment (25) length is less than the first oblique orbit segment (17).
6. diameter changing mechanism as claimed in claim 1, it is characterized in that: be also arranged with reducing ball seat (3) in the annular protrusion of described sliding sleeve (4), described reducing ball seat (3) is positioned at end, sliding sleeve (4) annular protrusion upper end.
7. diameter changing mechanism as claimed in claim 6, is characterized in that: described reducing ball seat (3) is " C " global seat.
8. diameter changing mechanism as claimed in claim 6, is characterized in that: described reducing ball seat (3) is distinguish slips ball seat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410463178.XA CN104234683B (en) | 2014-09-12 | 2014-09-12 | A kind of diameter changing mechanism |
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| CN201410463178.XA CN104234683B (en) | 2014-09-12 | 2014-09-12 | A kind of diameter changing mechanism |
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| CN104234683A true CN104234683A (en) | 2014-12-24 |
| CN104234683B CN104234683B (en) | 2017-03-15 |
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| CN201410463178.XA Expired - Fee Related CN104234683B (en) | 2014-09-12 | 2014-09-12 | A kind of diameter changing mechanism |
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|---|---|
| CN104234683B (en) | 2017-03-15 |
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Effective date of registration: 20201027 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Address before: 710018 Shaanxi province Xi'an Weiyang Changqing Changqing prosperous Park District Building Room 1207 Patentee before: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. |
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