CN201190554Y - Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool - Google Patents
Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool Download PDFInfo
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- CN201190554Y CN201190554Y CNU200820103458XU CN200820103458U CN201190554Y CN 201190554 Y CN201190554 Y CN 201190554Y CN U200820103458X U CNU200820103458X U CN U200820103458XU CN 200820103458 U CN200820103458 U CN 200820103458U CN 201190554 Y CN201190554 Y CN 201190554Y
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- sliding sleeve
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- caulking groove
- embedding
- watt
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Abstract
The utility model discloses a mechanical control oil field underground multiple switch valve. A shell body is provided with an outside liquid outlet hole, a sliding sleeve is sleeved in the shell body, the pipe wall of the shell body is provided with three sealing retaining rings, an inside liquid outlet hole is arranged between an upper sealing retaining ring and a middle sealing retaining ring, the outer circumferential surface of the sliding sleeve is provided with an upper rail groove and a lower rail groove, and the outer wall of the shell body is provided with a rail pin which slides along the rail grooves; the sliding sleeve is internally provided with a caulking groove, the lower end of the sliding sleeve is a thrust bearing for the caulking groove, the sliding sleeve is connected with a core sleeve in a sleeved way, the core sleeve arranged at the lower end of the sliding sleeve is sleeved with an upper thrust bearing, and the core sleeve between the upper thrust bearing and a lower joint is sleeved with a spring. The utility model discloses a special switch tool, the peripheral wall of a center pipe is provided with a groove which is internally provided with a compression spring, the compression spring is provided with an embedded tile in a locking way, the center pipe is sleeved with an upper pressure sleeve and a lower pressure sleeve in a threaded way, location lug bosses at the both ends of the embedded tile are locked in the ends of the upper pressure sleeve and the lower pressure sleeve, and the embedded tile is matched with the caulking groove in the switch valve. The utility model can solve the technical problems of multilayer-section layer processing of one-trip string of a horizontal well, and the like, thereby guaranteeing the normal work of an oil well.
Description
Technical field
The utility model relates to machinery control down-hole, oil field multiple switching valve and the switching tools that a kind of oil well production operation is used.
Background technology
At present, in the underground work of field produces, generally be to sprain to press by the throwing steel ball to open or close control valve for fluids and open or close control valve for fluids by steel wire operation.These valves can only open once or cut out once, can not realize multiple switching, therefore can't satisfy the technical requirements that layering processing of oil-water well multi-section multi-layer or oil well delamination are looked for water proof, can not be applied to horizontal well.
The utility model content
The purpose of this utility model is to provide a kind of machinery control down-hole, oil field multiple switching valve, it is simple in structure, be used with switching tools and can realize that the down-hole repeatedly opens and closes operation, switch is flexible, can satisfy the technical requirements that layering processing of oil-water well multi-section multi-layer or oil well delamination are looked for water proof, can be applicable to horizontal well, easy to use.
Another purpose of the present utility model provides the matching used special switch instrument of a kind of and described machinery control down-hole, oil field multiple switching valve, it is simple in structure, be easy to make, be used and can repeatedly open and close valve with switch valve, easy to operate.
The purpose of this utility model is achieved in that a kind of machinery control down-hole, oil field multiple switching valve, comprise tubular shell, on the two ends of housing have, lower contact, on the tube wall of housing top outer fluid hole is being set, be equipped with sliding sleeve near being slipper seal in the housing of top connection, be provided with at interval from top to bottom on the top tube wall of sliding sleeve, in, following three seals back-up ring, on, fluid hole in being provided with on the sliding sleeve wall between the middle Sealing shield ring, be provided with on the sliding sleeve outer circumference surface of lower seal back-up ring below the two opening relative spacing interlaced arrangement on, the lower railway groove, the groove that gets on the right track is the ratchet-shaped groove, and the lower railway groove is made of the elongated slot and the short groove of interlaced arrangement; On the outer wall of housing middle part track pin is being set, when switch valve is in closed condition, outer fluid hole in, between the lower seal back-up ring, the track pin medial extremity is positioned at the elongated slot lower end; Annular caulking groove is being set in the sliding sleeve, the caulking groove upper surface is a taper seat, the caulking groove lower end is the caulking groove thrust bearing that is sleeved in the sliding sleeve, the external diameter of caulking groove thrust bearing is greater than the internal diameter of caulking groove, suit core retainer plate in the sliding sleeve bottom, and the two links to each other by screw thread, and the core retainer plate upper end offsets with caulking groove thrust bearing lower surface, suit up-thrust bearing on the core retainer plate periphery wall of sliding sleeve lower end, and suit spring on the core retainer plate between up-thrust bearing and the lower contact inner face.
The supporting use of a kind of and described switch valve, it is carried out the special switch instrument of opening and closing, this switching tools comprises a central tube, on the central tube, the lower end is a nipple, be symmetrical arranged groove on the axial periphery wall at central tube middle part, the compression spring vertically is being set respectively in the groove, on the compression spring respectively spiral-lock embedding watt, the two ends of embedding watt have outward extending positioning boss respectively, by the suit that is threaded respectively on the central tube at embedding watt two ends, following gland, the positioning boss at embedding watt two ends snaps in respectively, in the following gland end, distance between the embedding watt end face is greater than last, the external diameter of following gland, the length and the diameter of embedding watt all match with the length and the internal diameter of described caulking groove.
The using method of the utility model switch valve following (is row with the horizontal well): several switch valves that are in initial closed state are connected in the lower going-into-well on request with kits such as oil pipe and hydraulic base sealed packers.Behind the good well head of seat, from the oil pipe wedge sealed packer of spraining.Be lowered to switching tools, after switching tools was lowered to oil pipe, the spring under the embedding watt was compressed embedding watt contraction.When the caulking groove in the switching tools target approach valve sliding sleeve, embedding watt is opened under the effect of spring, in the caulking groove of flush switch valve sliding sleeve.Continue to transfer tubing string and give the thrust of instrument one downward (preceding), this thrust watt is passed to caulking groove thrust bearing and core retainer plate by embedding, and core retainer plate links to each other with sliding sleeve by screw thread, and the drive sliding sleeve moves forward.On the sliding sleeve hypomere external surface rail groove is arranged, the track pin epimere inserts rail groove, and hypomere is fixed in the housing.Sliding sleeve is when front slide and track pin generation relative motion, when the upper end of the groove that gets on the right track contact track pin, the restriction of groove track shape owing to get on the right track, the rotation of certain angle will take place in sliding sleeve, and caulking groove thrust bearing and up-thrust bearing make the rotation of sliding sleeve realize easily.In this process, by the top of the original supreme rail groove of elongated slot lower end relative motion, sliding sleeve stops to move track pin in the rail groove of sliding sleeve.This process also is the continuous compressed process of switch valve spring.Carry oil pipe then and make embedding watt leave caulking groove, under the effect of switch valve spring force, sliding sleeve moves backward.Same because the restriction of trade shape in this process, the rotation of certain angle will take place in sliding sleeve, last track pin is extremely lacked the lower end of groove by the top relative motion of the groove that gets on the right track in the rail groove of sliding sleeve, this moment, the interior fluid hole on the sliding sleeve was communicated with outer fluid hole on the housing, and valve is in open mode.Switching tools is proposed at last.Close this valve if desired, method is the same.Promptly be lowered to the switching tools of this valve, tubing string stops descendingly when treating that switching tools enters this valve, continues to transfer tubing string weight, applies certain thrust to sliding sleeve, proposes switching tools then.Because the motion of sliding sleeve, track pin is by the lower end of short groove lower end relative motion to the another one elongated slot in this process, the initial position when sliding sleeve is got back to switch valve again and is in closed condition, and the outer fluid hole on the housing is closed, and valve is shut again.And so forth, any one valve can repeatedly open, cut out, and therefore the tubing string of forming with this valve can satisfy multi-section multi-layer layering processing or look for the water proof job requirements.The utility model is applicable to the one-trip string multi-section multi-layer layering processing of oilfield horizontal well, straight well and high angle hole and water detection, water proof operation.The utility model switch valve is simple in structure, be used with switching tools and can realize that the down-hole repeatedly opens and closes operation, switch is flexible, can satisfy the technical requirements that layering processing of oil-water well multi-section multi-layer or oil well delamination are looked for water proof, can be applicable to horizontal well, easy to use.Special switch instrument described in the utility model, it is simple in structure, is easy to make, and is used and can repeatedly opens and closes valve with switch valve, and is easy to operate.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 looks the semi-section structural representation for master of the present utility model;
Fig. 2 is the part expanded view of upper and lower rail groove among Fig. 1;
Fig. 3 looks the semi-section structural representation for the master of the utility model switching tools;
Structural representation when Fig. 4 opens with switching tools for the utility model switch valve;
Fig. 5 is the utility model user mode figure.
The specific embodiment
A kind of machinery control down-hole, oil field multiple switching valve as shown in Figure 1, comprises tubular shell 1, and the two ends of housing 1 have upper and lower joint.On the housing 1 top tube wall outer fluid hole 5 is being set, be equipped with sliding sleeve 9 near being slipper seal in the housing 1 of top connection, upper, middle and lower three seals back-up ring 2,4,6 is being set at interval from top to bottom, fluid hole 3 in going up, being provided with on the sliding sleeve wall between the middle Sealing shield ring 2,4 on the top tube wall of sliding sleeve 9.As shown in Figure 1 and Figure 2, the upper and lower rail groove of the two opening relative spacing interlaced arrangement is being set on sliding sleeve 9 outer circumference surfaces of lower seal back-up ring 6 belows, the groove that gets on the right track is a ratchet-shaped groove 18, and the lower railway groove is made of the elongated slot 10 and the short groove of interlaced arrangement.As shown in Figure 2, the sliding sleeve outer wall upper surface between the long and short groove is the inclined-plane that is parallel to each other, and adjacent long and short groove lays respectively at the both sides of ratchet-shaped groove ratchet tip.On the housing 1 middle part outer wall track pin 12 is being set.As shown in Figure 1, when switch valve is in closed condition, outer fluid hole 5 in, between the lower seal back-up ring 4,6, track pin 12 medial extremitys are positioned at elongated slot 10 lower ends.When sliding sleeve 9 motions, track pin 12 is done counter motion with respect to sliding sleeve, because the between cog joint face of ratchet-shaped groove 18 is the inclined-plane, track pin 12 will be slided along this inclined-plane like this, actual effect is to produce relative rotation between sliding sleeve 9 and the housing 1, and the sliding sleeve outer wall upper surface between the long and short groove is that the inclined-plane that is parallel to each other is convenient to track pin 12 and is slided in the short groove in elongated slot.Annular caulking groove 7 is being set in sliding sleeve 9 middle parts, caulking groove 7 upper surfaces are taper seat, caulking groove 7 lower ends are the caulking groove thrust bearing 8 that is sleeved in the sliding sleeve 9, and the external diameter of caulking groove thrust bearing 8 is greater than the internal diameter of caulking groove 7, and promptly caulking groove thrust bearing 8 residing sliding sleeve internal diameters are greater than the internal diameter of caulking groove 7.Suit core retainer plate 11 in sliding sleeve 9 bottoms, links to each other by screw thread between sliding sleeve 9 and the core retainer plate 11, will drive sliding sleeve 9 motions like this when core retainer plate 11 motions.Core retainer plate 11 upper ends and caulking groove thrust bearing 8 lower surfaces offset.Suit up-thrust bearing 13 on core retainer plate 11 periphery walls of sliding sleeve lower end, and suit spring 14 on the core retainer plate 11 between up-thrust bearing 13 and lower contact 16 inner faces.On the core retainer plate 11 between spring 14 and lower contact 16 inner faces, go back suit and lower thrust-bearing 15.Be more convenient for the like this rotation of sliding sleeve 9.
The supporting use of a kind of and described switch valve, it is carried out the special switch instrument of opening and closing, as shown in Figure 3, this switching tools comprises a central tube 19, on the central tube 19, the lower end is a nipple, be symmetrical arranged groove on the axial periphery wall at central tube 19 middle parts, compression spring 22 vertically is being set respectively in the groove, on the compression spring 22 respectively spiral-lock embedding watts 21, the two ends of embedding watts 21 have outward extending positioning boss respectively, by the suit that is threaded respectively on the central tube 19 at embedding watt 21 two ends, following gland 20,23, the positioning boss at embedding watt 21 two ends snaps in respectively, following gland 20, in 23 ends, distance between embedding watt 21 end faces is greater than last, following gland 20,23 external diameter, the length and the diameter of embedding watts 21 all match with the length and the internal diameter of described caulking groove 7.Embedding watt 21 end faces near central tube 19 upper ends are conical surface, and embedding watt 21 other ends of close central tube 19 lower ends are flat surface.
The on-off principle and the using method of the utility model switch valve following (is row with the horizontal well): several (see figure 1) the utility model down-hole multiple switching valves that are in initial closed state and kits such as oil pipe and hydraulic base sealed packer are connected on request (the caulking groove length in each valve sliding sleeve is all inequality in the lower going-into-well, long more near the caulking groove of oil well bottom more, each valve 28 all is furnished with a switching tools, its embedding watt length is complementary with the length of corresponding valve caulking groove), tubular column structure is as shown in Figure 5.
Behind the good well head of seat, from the oil pipe 26 wedge sealed packer 27 of spraining.Be lowered to the switching tools of wishing to open valve, after switching tools was lowered to oil pipe 26, the spring 22 under the embedding watts 21 was compressed, and embedding watts 21 is shunk.When in the caulking groove 7 in switching tools target approach valve 28 sliding sleeves, 7 li of the caulking grooves of flush switch valve sliding sleeve are opened in embedding watts 21 under the effect of spring 22.Continue to transfer tubing string and give the thrust of instrument one downward (preceding), this thrust is passed to caulking groove thrust bearing 8 and core retainer plate 11 by embedding watts 21, and core retainer plate 11 links to each other with sliding sleeve 9 by screw thread, and drive sliding sleeve 9 moves forward.On the sliding sleeve 9 hypomere external surfaces rail groove (as shown in Figure 2) is arranged, track pin 12 epimeres insert rail groove, and hypomere is fixed in the housing.Sliding sleeve 9 when front slide and track pin 12 relative motions take place, when the top of the groove 18 that gets on the right track contact track pin 12, the restriction of groove 18 trade shape owing to get on the right track, the rotation of certain angle will take place in sliding sleeve 9, and caulking groove thrust bearing 8 and up-thrust bearing make the rotation of sliding sleeve 9 realize easily.In this process, by the upper end of the supreme rail groove 18 of original elongated slot 10 lower end relative motions, sliding sleeve 9 stops to move track pin 12 in the rail groove of sliding sleeve 9.This process also is switch valve spring 14 continuous compressed processes.Carry oil pipe 26 then and make embedding watts 21 leave caulking groove 7, under the effect of switch valve spring 14 elastic force, sliding sleeve 9 moves backward.Same because the restriction of trade shape in this process, the rotation of certain angle will take place in sliding sleeve 9, the lower end of last track pin 12 extremely short groove of relative motion in the groove that gets on the right track of sliding sleeve, this moment, the interior fluid hole 3 on the sliding sleeve 9 was communicated with outer fluid hole 5 on the housing, as shown in Figure 4, valve is in open mode.Switching tools is proposed at last.
Close this valve if desired, method is the same.Promptly be lowered to the switching tools of this valve, tubing string stops descendingly when treating that switching tools enters this valve, continues to transfer tubing string weight, applies certain thrust to sliding sleeve, proposes switching tools then.Owing to the motion of sliding sleeve 9, track pin 12 is by the lower end of short groove lower end relative motion to the another one elongated slot in this process, and sliding sleeve 9 is got back to position shown in Figure 1 again, and the outer fluid hole 5 on the housing is closed, and valve is shut again.And so forth, any one valve can repeatedly open, cut out, and therefore the tubing string of forming with this valve can satisfy multi-section multi-layer layering processing or look for the water proof job requirements, is specially adapted to horizontal well.
Claims (4)
1, a kind of machinery control down-hole, oil field multiple switching valve, comprise tubular shell (1), it is characterized in that: on the two ends of housing (1) have, lower contact, on the tube wall of housing (1) top outer fluid hole (5) is being set, be equipped with sliding sleeve (9) near being slipper seal in the housing (1) of top connection, be provided with at interval from top to bottom on the top tube wall of sliding sleeve (9), in, following three seals back-up ring (2), (4), (6), on, middle Sealing shield ring (2), (4) fluid hole (3) in being provided with on the sliding sleeve wall between, be provided with on sliding sleeve (9) outer circumference surface of lower seal back-up ring (6) below the two opening relative spacing interlaced arrangement on, the lower railway groove, the groove that gets on the right track is ratchet-shaped groove (18), and the lower railway groove is made of the elongated slot (10) and the short groove of interlaced arrangement; On the outer wall of housing (1) middle part track pin (12) is being set, when switch valve was in closed condition, outer fluid hole (5) was arranged in, between the lower seal back-up ring (4), (6), and track pin (12) medial extremity is positioned at elongated slot (10) lower end; Annular caulking groove (7) is being set in the sliding sleeve (9), caulking groove (7) upper surface is a taper seat, caulking groove (7) lower end is for being sleeved on the caulking groove thrust bearing (8) in the sliding sleeve (9), the external diameter of caulking groove thrust bearing (8) is greater than the internal diameter of caulking groove (7), suit core retainer plate (11) in the sliding sleeve bottom, the two links to each other by screw thread, core retainer plate (11) upper end offsets with caulking groove thrust bearing (8) lower surface, suit up-thrust bearing (13) on the core retainer plate of sliding sleeve lower end (11) periphery wall, and the core retainer plate (11) between up-thrust bearing (13) and lower contact (16) inner face is gone up suit and spring (14).
2, switch valve according to claim 1 is characterized in that: go back suit and lower thrust-bearing (15) on the core retainer plate (11) between spring (14) and lower contact (16) inner face.
3, a kind of and the supporting use of the described switch valve of claim 1, it is carried out the special switch instrument of opening and closing, it is characterized in that: this switching tools comprises a central tube (19), on the central tube (19), the lower end is a nipple, be symmetrical arranged groove on the axial periphery wall at central tube (19) middle part, compression spring (22) vertically is being set respectively in the groove, compression spring (22) is gone up the difference spiral-lock and embedding watt (21), the two ends of embedding watt (21) have outward extending positioning boss respectively, by the suit that is threaded respectively on the central tube (19) at embedding watt (21) two ends, following gland (20), (23), the positioning boss at embedding watt (21) two ends snaps in respectively, following gland (20), (23) in the end, distance between embedding watt (21) end face is greater than last, following gland (20), (23) external diameter, the length of embedding watt (21) and diameter all match with the length and the internal diameter of described caulking groove (7).
4, switching tools according to claim 3 is characterized in that: embedding watt (21) end face near central tube (19) upper end is a conical surface, and embedding watt (21) other end of close central tube (19) lower end is a flat surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820103458XU CN201190554Y (en) | 2008-02-03 | 2008-02-03 | Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820103458XU CN201190554Y (en) | 2008-02-03 | 2008-02-03 | Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool |
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| Publication Number | Publication Date |
|---|---|
| CN201190554Y true CN201190554Y (en) | 2009-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820103458XU Expired - Fee Related CN201190554Y (en) | 2008-02-03 | 2008-02-03 | Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool |
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| Country | Link |
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| CN (1) | CN201190554Y (en) |
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| CN102650204A (en) * | 2012-05-16 | 2012-08-29 | 中国石油天然气股份有限公司 | Hydraulic control check valve |
| WO2012130144A1 (en) * | 2011-03-30 | 2012-10-04 | 克拉玛依特隆油田技术服务有限责任公司 | Hydraulically-controlled multi-switch valve and positioning instrument therefor |
| CN103104223A (en) * | 2013-02-05 | 2013-05-15 | 大庆纽斯达采油技术开发有限公司延安分公司 | Three-channel oil production switch |
| CN103154426A (en) * | 2010-08-31 | 2013-06-12 | 普拉德研究及开发股份有限公司 | Methods for completing multi-zone production wells using sliding sleeve valve assembly |
| CN104278970A (en) * | 2013-07-05 | 2015-01-14 | 天津大港油田钻采技术开发公司 | Hydraulic type underground layered water detecting and blocking switch |
| CN104343417A (en) * | 2014-11-06 | 2015-02-11 | 长江大学 | Six-opening switch sliding bush |
| CN104632109A (en) * | 2014-12-03 | 2015-05-20 | 宝鸡石油机械有限责任公司 | Circulating nipple capable of being opened and closed repeatedly |
| CN104912517A (en) * | 2015-06-19 | 2015-09-16 | 上海优强石油科技有限公司 | Face-seal high-temperature sliding sleeve |
| CN105201462A (en) * | 2015-10-23 | 2015-12-30 | 西安石油大学 | Angle-adjustable hydraulic sand blasting perforation fracturing spray gun |
| CN105317400A (en) * | 2014-08-04 | 2016-02-10 | 中国石油化工股份有限公司 | Fluid control valve |
| CN109707358A (en) * | 2017-10-25 | 2019-05-03 | 中海石油(中国)有限公司上海分公司 | Fracturing string and its fracturing process |
| CN111364952A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Horizontal well injection and production system |
| CN112943201A (en) * | 2021-03-30 | 2021-06-11 | 中国石油大学(北京) | Infinite-stage mechanical switch fracturing sliding sleeve and shale oil three-dimensional development fracturing tool |
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| CN103154426A (en) * | 2010-08-31 | 2013-06-12 | 普拉德研究及开发股份有限公司 | Methods for completing multi-zone production wells using sliding sleeve valve assembly |
| WO2012130144A1 (en) * | 2011-03-30 | 2012-10-04 | 克拉玛依特隆油田技术服务有限责任公司 | Hydraulically-controlled multi-switch valve and positioning instrument therefor |
| CN102650204A (en) * | 2012-05-16 | 2012-08-29 | 中国石油天然气股份有限公司 | Hydraulic control check valve |
| CN102650204B (en) * | 2012-05-16 | 2015-07-08 | 中国石油天然气股份有限公司 | Hydraulic control check valve |
| CN103104223B (en) * | 2013-02-05 | 2016-01-20 | 中庆能源工程技术有限公司 | Three-channel oil production switch |
| CN103104223A (en) * | 2013-02-05 | 2013-05-15 | 大庆纽斯达采油技术开发有限公司延安分公司 | Three-channel oil production switch |
| CN104278970A (en) * | 2013-07-05 | 2015-01-14 | 天津大港油田钻采技术开发公司 | Hydraulic type underground layered water detecting and blocking switch |
| CN104278970B (en) * | 2013-07-05 | 2016-12-28 | 天津大港油田钻采技术开发公司 | Fluid pressure type laminated distributor under well looks for card taps |
| CN105317400B (en) * | 2014-08-04 | 2018-08-14 | 中国石油化工股份有限公司 | Control valve for fluids |
| CN105317400A (en) * | 2014-08-04 | 2016-02-10 | 中国石油化工股份有限公司 | Fluid control valve |
| CN104343417A (en) * | 2014-11-06 | 2015-02-11 | 长江大学 | Six-opening switch sliding bush |
| CN104632109B (en) * | 2014-12-03 | 2017-08-25 | 宝鸡石油机械有限责任公司 | It is a kind of to repeat the circulating sub of opening and closing |
| CN104632109A (en) * | 2014-12-03 | 2015-05-20 | 宝鸡石油机械有限责任公司 | Circulating nipple capable of being opened and closed repeatedly |
| CN104912517A (en) * | 2015-06-19 | 2015-09-16 | 上海优强石油科技有限公司 | Face-seal high-temperature sliding sleeve |
| CN105201462A (en) * | 2015-10-23 | 2015-12-30 | 西安石油大学 | Angle-adjustable hydraulic sand blasting perforation fracturing spray gun |
| CN109707358A (en) * | 2017-10-25 | 2019-05-03 | 中海石油(中国)有限公司上海分公司 | Fracturing string and its fracturing process |
| CN109707358B (en) * | 2017-10-25 | 2023-09-05 | 中海石油(中国)有限公司上海分公司 | Fracturing string and fracturing method thereof |
| CN111364952A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Horizontal well injection and production system |
| CN112943201A (en) * | 2021-03-30 | 2021-06-11 | 中国石油大学(北京) | Infinite-stage mechanical switch fracturing sliding sleeve and shale oil three-dimensional development fracturing tool |
| CN112943201B (en) * | 2021-03-30 | 2023-09-29 | 中国石油大学(北京) | Fracturing sliding sleeve of infinite-level mechanical switch and shale oil three-dimensional development fracturing tool |
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Assignee: Karamay Telong Oil Field Technology Service Co., Ltd. Assignor: Mao Wanli Contract record no.: 2011650000012 Denomination of utility model: Mechanically controlled multi-time on-off valve at downhole of oilfield and on-off tool Granted publication date: 20090204 License type: Exclusive License Record date: 20110516 |
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