CN203978409U - Tubing string for back-up sand separate stratum fracfturing technique - Google Patents
Tubing string for back-up sand separate stratum fracfturing technique Download PDFInfo
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- CN203978409U CN203978409U CN201420219461.3U CN201420219461U CN203978409U CN 203978409 U CN203978409 U CN 203978409U CN 201420219461 U CN201420219461 U CN 201420219461U CN 203978409 U CN203978409 U CN 203978409U
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- tubing string
- sliding sleeve
- oil pipe
- sand
- controllable confining
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Abstract
The utility model relates to oil field compression fracture technical field, specifically disclose a kind of tubing string for back-up sand separate stratum fracfturing technique, comprise oil pipe, be positioned at oil pipe lower end and the safety that connects by oil pipe is given up, controllable confining, ejector, sleeve base and guiding check valve successively, controllable confining is provided with sliding sleeve.The utility model advantage is, adopt after said structure, this tubing string is by the disposable multistage perforation that completes of jetting, then drag envelope and back-up sand layered mode on tubing string utilization list, from oil pipe sand fracturing, complete successively a minute interval transformation, for oilfield old well refracturing provides a kind of safety, the reliable process pipe string of packing.In the abrasive perforating stage, sliding sleeve shutoff controllable confining inlet opening, annular space liquid outlet channel is unimpeded, has guaranteed perforating effect; The pressure break stage is opened sliding sleeve by pitching, and controllable confining is in running order, can judge that whether packer seals with interlayer whether alter groove, has guaranteed the validity of old well refracturing according to sleeve pipe fluid situation.
Description
Technical field
The utility model relates to oil field compression fracture technical field, be particularly related to the old well of low permeability reservoir and repeat reforming technology tubing string, be a kind of tubing string for back-up sand separate stratum fracfturing technique, be applicable to straight well, directional well, the more oilfield old well segmentation refracturing transformation of the horizontal well transformation number of plies.
Background technology
Low-permeability oil gas well pressure break completion was produced after a period of time, and fracture condudtiviy declines gradually, in order to improve single well productivity, often needs to re-start pressure break.For old well again pressure break, conventionally adopting two envelope single deck tape-recorder tubing strings to realize card lamination splits, but this process pipe string is due to band end packer, in pressing crack construction, there is larger sand card risk, so can replace underseal packing mode with back-up sand layered mode, take envelope on hydraulic ejector band list, back-up sand layering, jetting to inject fracturing technology.But this technique must be implemented in advance perforating job before construction, and construction period is longer, so the utility model proposes a kind of hydraulic ejector band controllable confining, back-up sand layered fracturing technology pipe string that repeats transformation for oilfield old well.
Utility model content
The utility model proposes a kind of tubing string for back-up sand separate stratum fracfturing technique, it first carries out disposable perforation with hydraulic ejector, then controllable confining sliding sleeve is opened in pitching, by controllable confining and back-up sand mode, realizes effective packing, has dragged jetting segmentation card lamination and has split.
To achieve these goals, the utility model has adopted following technical scheme: a kind of tubing string for back-up sand separate stratum fracfturing technique, comprise oil pipe, be positioned at oil pipe lower end and the safety that connects by oil pipe is given up, controllable confining, ejector, sleeve base and guiding check valve successively, described controllable confining is provided with sliding sleeve.
Further, controllable confining is K344 packer, and initially setting pressure is 1～1.5MPa, and it is 10～20MPa that work sets pressure.
Further, described controllable confining and sliding sleeve are connected by screw.
Further, in the perforation stage, controllable confining inlet opening is by sliding sleeve shutoff, in deblocking state; After perforation, throw the steel ball of φ 25.4mm and open after sliding sleeve, controllable confining sets single upper envelope effect of playing.
The beneficial effects of the utility model are: adopt after said structure, the first, this tubing string is by the disposable multistage perforation that completes of jetting, then drag envelope and back-up sand layered mode on tubing string utilization list, from oil pipe sand fracturing, complete successively a minute interval transformation, for oilfield old well refracturing provides a kind of safety, the reliable process pipe string of packing.
The second, in the abrasive perforating stage, sliding sleeve shutoff controllable confining inlet opening, annular space liquid outlet channel is unimpeded, has guaranteed perforating effect; The pressure break stage is opened sliding sleeve by pitching, and controllable confining is in running order, can judge that whether packer seals with interlayer whether alter groove, has guaranteed the validity of old well refracturing according to sleeve pipe fluid situation.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment technical scheme, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only that this practicality is in order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is structural representation of the present utility model.
In figure, 1, oil pipe 2, safety give up 3, controllable confining 4, sliding sleeve 5, ejector 6, sleeve base 7, guiding check valve.
The specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
A kind of tubing string for back-up sand separate stratum fracfturing technique as shown in Figure 1, comprises that oil pipe 1, safety give up 2, controllable confining 3, sliding sleeve 4, ejector 5, sleeve base 6 and guiding check valve 7.In the lower end of oil pipe 1, be connected with safety and give up 2, in give up 2 lower end of safety, by oil pipe 1, be connected with controllable confining 3 and sliding sleeve 4, sliding sleeve 4 is positioned on controllable confining 3 and by screw to be fixed, in controllable confining 3 lower ends, be connected with ejector 5, in the lower end of ejector 5, be connected with sleeve base 6, in sleeve base 6 lower ends, be connected with guiding check valve 7.
The fracturing process that hydraulic ejector 5 uses with controllable confining 3, back-up sand layered fracturing technology pipe string is as follows:
1, trip out after flow string, be lowered to hydraulic ejector 5 band controllable confinings 3, back-up sand layered fracturing technology pipe string, ejector 5 is aimed to first paragraph design improvement position, complete first paragraph perforation: from jetting, inject perforating fluid, carry out hydraulic jet perforation, when load fluid is during to nozzle distance 200m, improve discharge capacity abrasive perforating.During perforation, controllable confining 3 inlet openings are by sliding sleeve 4 shutoff, and in deblocking state, perforating fluid injects from jetting all the time, and oil jacket annular space returns out.
2, on, put forward the hydraulic jet perforation that oil pipe 1 completes all the other sections piecemeal.
3, after all sections of perforations, ejector 5 is aimed at first paragraph design improvement position, from oil pipe 1, throw the steel ball of φ 25.4mm, treat that steel ball drops on sliding sleeve 4, oil pipe 1 adds hydraulic pressure, shear the pin that is connected between controllable confining 3 and sliding sleeve 4, sliding sleeve 4 together falls on sleeve base 6 with steel ball, now controllable confining 3 can normally set, when nozzle, crossing liquid produces after chock pressure difference, controllable confining 3 is realized single upper envelope function in setting state, from oil pipe 1, injects fracturing fluid, completes first paragraph pressing crack construction.
4, upper lifting pipe post is aimed at second segment design improvement position to ejector 5, and direct circulation replaces corresponding sand amount, base fluid compacting back-up sand section capable of circulation after sand sedimentation.
5, from oil pipe 1, inject fracturing fluid, complete second segment pressing crack construction.
6, repeating step 4-5, completes all the other each section of pressing crack constructions.
7, trip out hydraulic ejector 5 band controllable confinings 3, back-up sand layered fracturing technology pipe string, lower sand washing tool string, disposablely goes out sand plug in pit shaft, finally carries out discharge opeing, test, production.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. the tubing string for back-up sand separate stratum fracfturing technique, it is characterized in that, comprise oil pipe (1), be successively positioned at oil pipe (1) lower end and by the safety that oil pipe (1) connects give up (2), controllable confining (3), ejector (5), sleeve base (6) and guiding check valve (7), described controllable confining (3) is provided with sliding sleeve (4).
2. the tubing string for back-up sand separate stratum fracfturing technique according to claim 1, is characterized in that: controllable confining (3) is K344 packer, and initially setting pressure is 1～1.5MPa, and it is 10～20MPa that work sets pressure.
3. the tubing string for back-up sand separate stratum fracfturing technique according to claim 1, is characterized in that: described controllable confining (3) is connected by screw with sliding sleeve (4).
4. according to the tubing string for back-up sand separate stratum fracfturing technique described in claim 1～3 any one, it is characterized in that: in the perforation stage, controllable confining (3) inlet opening is by sliding sleeve (4) shutoff, in deblocking state; After perforation, throw the steel ball of φ 25.4mm and open after sliding sleeve (4), controllable confining (3) sets single upper envelope effect of playing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420219461.3U CN203978409U (en) | 2014-04-26 | 2014-04-26 | Tubing string for back-up sand separate stratum fracfturing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420219461.3U CN203978409U (en) | 2014-04-26 | 2014-04-26 | Tubing string for back-up sand separate stratum fracfturing technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203978409U true CN203978409U (en) | 2014-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420219461.3U Expired - Fee Related CN203978409U (en) | 2014-04-26 | 2014-04-26 | Tubing string for back-up sand separate stratum fracfturing technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761643A (en) * | 2016-12-26 | 2017-05-31 | 中国石油天然气股份有限公司 | System and method capable of realizing hydraulic jet continuous sand filling and layered fracturing |
| CN109236261A (en) * | 2018-11-28 | 2019-01-18 | 中国石油集团渤海钻探工程有限公司 | A kind of oil/gas well huge discharge water-jet layered fracturing pipe string and fracturing process |
| CN109838222A (en) * | 2017-11-28 | 2019-06-04 | 中国石油化工股份有限公司 | Fixed point water-jet acid fracturing device and method for ultradeep well |
| CN113107418A (en) * | 2021-03-25 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Sectional pressure-maintaining grouting device and method for horizontal drilling of coal seam floor aquifer |
| RU2815245C1 (en) * | 2023-08-18 | 2024-03-12 | Тимур Андреевич Постнов | Method of well sealing after multi-stage hydraulic fracturing |
-
2014
- 2014-04-26 CN CN201420219461.3U patent/CN203978409U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106761643A (en) * | 2016-12-26 | 2017-05-31 | 中国石油天然气股份有限公司 | System and method capable of realizing hydraulic jet continuous sand filling and layered fracturing |
| CN109838222A (en) * | 2017-11-28 | 2019-06-04 | 中国石油化工股份有限公司 | Fixed point water-jet acid fracturing device and method for ultradeep well |
| CN109838222B (en) * | 2017-11-28 | 2021-05-25 | 中国石油化工股份有限公司 | Fixed-point hydraulic jet acid fracturing device and method for ultra-deep well |
| CN109236261A (en) * | 2018-11-28 | 2019-01-18 | 中国石油集团渤海钻探工程有限公司 | A kind of oil/gas well huge discharge water-jet layered fracturing pipe string and fracturing process |
| CN113107418A (en) * | 2021-03-25 | 2021-07-13 | 中煤科工集团西安研究院有限公司 | Sectional pressure-maintaining grouting device and method for horizontal drilling of coal seam floor aquifer |
| RU2815245C1 (en) * | 2023-08-18 | 2024-03-12 | Тимур Андреевич Постнов | Method of well sealing after multi-stage hydraulic fracturing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20160426 |