CN102797449A - Method for reducing hydraulic jet fracturing and bursting pressures of compact reservoir - Google Patents
Method for reducing hydraulic jet fracturing and bursting pressures of compact reservoir Download PDFInfo
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- CN102797449A CN102797449A CN2011101374785A CN201110137478A CN102797449A CN 102797449 A CN102797449 A CN 102797449A CN 2011101374785 A CN2011101374785 A CN 2011101374785A CN 201110137478 A CN201110137478 A CN 201110137478A CN 102797449 A CN102797449 A CN 102797449A
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Abstract
The invention relates to a method for reducing hydraulic jet fracturing and bursting pressures of a compact reservoir. If the reservoir is found out to be difficult to open by pressing due to the high fracturing pressure after primary sand jet perforation is carried out, a wellhead is instantly dismounted, and the direction of a tubular column is determined; the tubular column is lifted upwards or downwards, so that jetting points are staggered in a small distance, and secondary sand jet perforation is carried out; and cracks formed by jetting twice are communicated to form a larger crack, so that the fracturing pressure of the reservoir is reduced.
Description
Technical field:
The present invention relates to a kind of method that ultralow oil impregnate is hidden compact reservoir jetting pressure break fracture pressure that is fit to, is that the secondary hydraulic jet perforation that adopts little spacing to stagger realizes specifically.
Background technology:
At present, ultralow oil impregnate gas-bearing formation reservoir properties is poor, and permeability is low, and well yield is low, but there is the local high section of oozing in partial wells, and adopts the jetting pressure break that the high section of oozing is fixed a point to transform field trial and has shown yield potential preferably.But in jetting pressure break implementation process, run into reservoir man-made fracture crack initiation difficulty, the phenomenon that initial operation pressure is high.Present used fracturing technology is through adopting an abrasive perforating (see figure 4), and reducing the compact reservoir fracture pressure through increase sandblast amount with the prolongation injecting time does not have effect in some aboveground enforcement.Usually adopt now the intact high concentration mud acid that squeezes of abrasive perforating to reduce brokenly and compress into and press off the stratum to this situation; This technology high concentration mud acid on the one hand can be destroyed cement sheath; Influence the independent of two sections man-made fracture and extend, high concentration mud acid entering stratum can generate secondary precipitation and injure reservoir on the other hand.
Summary of the invention:
The object of the present invention is to provide the method that reduces compact reservoir jetting pressure break fracture pressure.The secondary hydraulic jet perforation that adopts little spacing to stagger reduces compact reservoir jetting pressure break fracture pressure.
A kind of method that reduces compact reservoir jetting pressure break fracture pressure of the present invention is: one time the intact reservoir fracture pressure of finding of abrasive perforating is high-leveled and difficult to press off, and horse back is laid down well head, confirms the tubing string orientation; Upper lifting pipe post or transfer tubing string the little spacing of specking is staggered, abrasive perforating once more; The seam cave UNICOM of twice perforation formation forms bigger seam cave, reduces the reservoir fracture pressure.
Described definite tubing string orientation can adopt the down-hole gyroscope to confirm, also can confirm through marking on two adjacent oil pipes and big flange.
The described little spacing of specking that makes staggers, and is the upper lifting pipe post or transfers tubing string and make second specking and first specking 0.1m that staggers.
Described second specking and first specking 0.1m that staggers puts the standard short oil pipe of 1.0m at well head in the fracturing tool tubular column structure, change the short oil pipe upper lifting pipe post 0.1m of 0.9m then into, and the short oil pipe that changes 1.1m into is transferred tubing string 0.1m.
The present invention relates to a kind of new method that ultralow oil impregnate is hidden compact reservoir jetting pressure break fracture pressure that is fit to, is that the secondary hydraulic jet perforation that adopts little spacing to stagger realizes specifically, and one time abrasive perforating is intact; Close sleeve gate and press reservoir,, lay down well head at once if find that the reservoir fracture pressure is high-leveled and difficult to press off; Confirm the tubing string orientation, guaranteeing under the motionless situation in tubing string orientation, according to the quality of reservoir properties about reservoir first specking; Determine the upper lifting pipe post or transfer tubing string 0.1m that abrasive perforating guarantees that the seam cave UNICOM of twice perforation formation forms bigger seam cave once more; Thereby reduce the reservoir fracture pressure, press off reservoir smoothly.
The present invention is in the technical innovation of having carried out aspect two of fracturing fluid:
1, new method
The secondary hydraulic jet perforation that little spacing staggers realizes the reduction of compact reservoir jetting pressure break fracture pressure.
2, confirm the best spacing that staggers
Confirming to stagger through a large amount of experiments, to reduce broken effect of pressing during for 0.1m the most obvious for spacing.
Description of drawings
Fig. 1 is No. 1 well construction curve map of embodiment.
Fig. 2 is No. 2 well construction curve maps of embodiment.
The seam cave that Fig. 3 secondary hydraulic jet perforation forms.
The seam cave that hydraulic jet perforation of Fig. 4 forms.
The specific embodiment:
The method that a kind of secondary hydraulic jet perforation (see figure 3) that adopts little spacing to stagger reduces compact reservoir jetting pressure break fracture pressure is: one time the intact reservoir fracture pressure of finding of abrasive perforating is high-leveled and difficult to press off, and horse back is laid down well head, confirms the tubing string orientation; Upper lifting pipe post or transfer tubing string the little spacing of specking is staggered, abrasive perforating once more; The seam cave UNICOM of twice perforation formation forms bigger seam cave, reduces the reservoir fracture pressure.
Described definite tubing string orientation can adopt the down-hole gyroscope to confirm, also can confirm through marking on two adjacent oil pipes and big flange.
Upper lifting pipe post or transfer tubing string and make second specking and first specking 0.1m that staggers.
Described second specking and first specking 0.1m that staggers puts the standard short oil pipe of 1.0m at well head in the fracturing tool tubular column structure, change the short oil pipe upper lifting pipe post 0.1m of 0.9m then into, and the short oil pipe that changes 1.1m into is transferred tubing string 0.1m.
Embodiment 1:
As shown in Figure 1 be No. 1 well after a hydraulic jet perforation, close sleeve gate and press reservoir, find that pressure surpasses sleeve pipe and limits pressure 45MPa, be difficult to press off.Lay down well head, on flange and adjacent oil pipe, make marks and confirm the tubing string orientation, guaranteeing under the motionless situation in tubing string orientation, according to reservoir properties situation about reservoir first specking; Find that first specking rerum natura that makes progress is better, decision upper lifting pipe post 0.1m removes the standard short oil pipe of the 1.0m of well head; Change the short oil pipe upper lifting pipe post 0.1m of 0.9m into, abrasive perforating once more, perforating parameter is with for the first time the same; Close sleeve gate once more and press reservoir, discovery pressure is 37MPa, presses off reservoir smoothly.
Embodiment 2:
As shown in Figure 2 be No. 2 wells after a hydraulic jet perforation, close sleeve gate and press reservoir, find that pressure surpasses sleeve pipe and limits pressure 45MPa, be difficult to press off.Lay down well head, on flange and adjacent oil pipe, make marks and confirm the tubing string orientation, guaranteeing under the motionless situation in tubing string orientation, according to reservoir properties situation about reservoir first specking; Find that the downward rerum natura of first specking is better, tubing string 0.1m is transferred in decision, and the standard short oil pipe of the 1.0m of well head is removed; The short oil pipe that changes 1.1m into is transferred tubing string 0.1m, abrasive perforating once more, and perforating parameter is with for the first time the same; Close sleeve gate once more and press reservoir, discovery pressure is 35MPa, presses off reservoir smoothly.
Claims (4)
1. method that reduces compact reservoir jetting pressure break fracture pressure is characterized in that: abrasive perforating is intact to be found that the reservoir fracture pressure is high-leveled and difficult and lays down well head to press off, and confirms the tubing string orientation at once; Upper lifting pipe post or transfer tubing string the little spacing of specking is staggered, abrasive perforating once more; The seam cave UNICOM of twice perforation formation forms bigger seam cave, reduces the reservoir fracture pressure.
2. according to the method for the described reduction compact reservoir of claim 1 jetting pressure break fracture pressure; It is characterized in that: described definite tubing string orientation; Can adopt the down-hole gyroscope to confirm, also can confirm through marking on two adjacent oil pipes and big flange.
3. according to the method for the described reduction compact reservoir of claim 1 jetting pressure break fracture pressure, it is characterized in that: the described little spacing of specking that makes staggers, and is through the upper lifting pipe post or transfers tubing string and make second specking and first specking 0.1m that staggers.
4. according to the method for the described reduction compact reservoir of claim 1 jetting pressure break fracture pressure; It is characterized in that: described second specking and first specking 0.1m that staggers; Be to change the short oil pipe upper lifting pipe post 0.1m of 0.9m into through standard short oil pipe, or the short oil pipe that changes 1.1m into is transferred tubing string 0.1m with the 1.0m that puts at well head in the fracturing tool tubular column structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110137478.5A CN102797449B (en) | 2011-05-25 | 2011-05-25 | Method for reducing hydraulic jet fracturing and bursting pressures of compact reservoir |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110137478.5A CN102797449B (en) | 2011-05-25 | 2011-05-25 | Method for reducing hydraulic jet fracturing and bursting pressures of compact reservoir |
Publications (2)
| Publication Number | Publication Date |
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| CN102797449A true CN102797449A (en) | 2012-11-28 |
| CN102797449B CN102797449B (en) | 2015-05-13 |
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| CN201110137478.5A Active CN102797449B (en) | 2011-05-25 | 2011-05-25 | Method for reducing hydraulic jet fracturing and bursting pressures of compact reservoir |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3682246A (en) * | 1971-01-19 | 1972-08-08 | Shell Oil Co | Fracturing to interconnect wells |
| RU2065930C1 (en) * | 1994-01-10 | 1996-08-27 | Борис Иванович Кирпиченко | Method for secondary opening of stratum |
| US20060070740A1 (en) * | 2004-10-05 | 2006-04-06 | Surjaatmadja Jim B | System and method for fracturing a hydrocarbon producing formation |
| CN101008408A (en) * | 2006-12-31 | 2007-08-01 | 天津爱博生技术开发有限公司 | Normal and reverse circulating jet pump with hydraulically-driven multiple switching sliding sleeve |
| CN101498210A (en) * | 2008-12-18 | 2009-08-05 | 中国石油集团长城钻探工程有限公司 | Coal bed gas slim hole hydraulic jet directional fracturing production increasing method |
-
2011
- 2011-05-25 CN CN201110137478.5A patent/CN102797449B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3682246A (en) * | 1971-01-19 | 1972-08-08 | Shell Oil Co | Fracturing to interconnect wells |
| RU2065930C1 (en) * | 1994-01-10 | 1996-08-27 | Борис Иванович Кирпиченко | Method for secondary opening of stratum |
| US20060070740A1 (en) * | 2004-10-05 | 2006-04-06 | Surjaatmadja Jim B | System and method for fracturing a hydrocarbon producing formation |
| CN101008408A (en) * | 2006-12-31 | 2007-08-01 | 天津爱博生技术开发有限公司 | Normal and reverse circulating jet pump with hydraulically-driven multiple switching sliding sleeve |
| CN101498210A (en) * | 2008-12-18 | 2009-08-05 | 中国石油集团长城钻探工程有限公司 | Coal bed gas slim hole hydraulic jet directional fracturing production increasing method |
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| CN102797449B (en) | 2015-05-13 |
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