CN104832140A - Method of improving production capacity of super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery - Google Patents
Method of improving production capacity of super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery Download PDFInfo
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- CN104832140A CN104832140A CN201410044953.8A CN201410044953A CN104832140A CN 104832140 A CN104832140 A CN 104832140A CN 201410044953 A CN201410044953 A CN 201410044953A CN 104832140 A CN104832140 A CN 104832140A
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- thermal recovery
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- radial bore
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Abstract
The invention provides a method of improving production capacity of a super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery. The method comprises steps: 1, a downhole milling tool is tripped in; 2, a downhole motor is used for driving the downhole milling tool to open a window on a casing in a target layer position; 3, the downhole milling tool is pulled up; 4, a hydraulic jetting tool connected with a coiled tubing is tripped in; 5, high-pressure water is pumped from the ground, and water jet is used for drilling multiple branch well holes in the target layer; and 6, the hydraulic jetting tool is pulled up for steam injection production. According to the method of improving production capacity of the super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery, steam injection pressure is reduced, the steam absorption ability of the ground layer is added, the steam injection dryness and the steam zone diffusion range are improved, the flowing ability of the heavy oil in the ground layer is added, and the purpose of improving the production capacity of the single well is achieved.
Description
Technical field
The present invention relates to oil extraction in oil field technical field, particularly one utilizes radial bore to transform reservoir, and auxiliary steam heating exploitation is to improve the method for the single well productivity of super Deep tight reservoir heavy crude reservoir.
Background technology
Along with the raising to unconventional petroleum resources attention degree, viscous crude is as the important component part of petroleum-based energy, its development potentiality also more highlights, the exploration and development of heavy crude reservoir also turns to current ultra-deep layer by the middle-shallow layer at initial stage, in the development process of super deep-layer heavy crude, a series of contradictions caused owing to burying the feature such as dark, strata pressure is high, permeability is low need solution badly.
At present conventional transformation reservoir, the method setting up high flow-guiding channel mainly contain formation breakdown and horizontal well drilling.Wherein pressure break can form the crack of high flow conductivity in the earth formation, ground steam injection pressure can be reduced, make the viscous crude in reservoir more be easy to flow to shaft bottom, but because fracture strike affects by stratum main stress bar, therefore fractuer direction is difficult to control, and the factor such as edge-bottom water, intermediate water all can affect the enforcement of fracturing technology.Although horizontal well development does not exist the problems referred to above, horizontal well has certain requirement to reservoir thickness, and the drilling well investment cost of horizontal well is higher, and investment cycle is longer.
Therefore, be necessary to explore a kind of economy and technically all feasible method, to solve the contradiction of " note does not enter, and can not adopt " in current super Deep tight reservoir Development of Viscous Crude Oil process.We have invented a kind of new radial bore assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity for this reason, solves above technical problem.
Summary of the invention
The object of this invention is to provide a kind of mode being formed many high flow-guiding channels by radial bore in the earth formation, reduce steam injection pressure, the radial bore increasing stratum vapor absorption capacity assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity.
Object of the present invention realizes by following technical measures: radial bore assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, the method that this radial bore assists thermal recovery to improve super Deep tight reservoir viscous crude single well productivity comprises: step 1, milling tool under lower going-into-well; Step 2, drives this down-hole milling tool to output window on the sleeve pipe of destination layer position by down-hole motor; Step 3, proposes this down-hole milling tool; Step 4, under enter the hydrajet tool connected with coiled tubing; Step 5, pumps into water under high pressure from ground, utilizes water jet in destination layer, get out multiple branch well hole; And step 6, propose this hydrajet tool, carry out steam injection production.Object of the present invention also realizes by following technical measures:
This down-hole milling tool is drill bit+flexible shaft+down-hole motor+motor flexible pipe+coiled tubing.
In step 2, sleeve pipe window diameter sleeve pipe outputed is 20mm.
This hydrajet tool is nozzle+jet hose+coiled tubing combination.
Nozzle diameter in this hydrajet tool is 12.7mm, and coiled tubing diameter is 19mm.
In steps of 5, pump into water under high pressure from ground, after utilizing water jet to get out first branch well hole in destination layer, the angle of conversion hydrajet tool, repeats in destination layer, get out multiple branch well hole, until the number of branch well hole reaches designing requirement.
The diameter of multiple branch well hole is 40mm-50mm, borehole length 100m.
Radial bore in the present invention assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, at initial stage of development, the mode of many high flow-guiding channels is formed in the earth formation by radial bore, reduce steam injection pressure, increase stratum vapor absorption capacity, improve the range of scatter of steam injection mass dryness fraction and steam zone, and increase viscous crude fluid ability in the earth formation, to reach the object improving single well productivity.The present invention is applicable to oil reservoir buried depth and is greater than 1600m, and in-place permeability is lower than 200 × 10
-3μm
2heavy crude reservoir.The present invention, by forming the Mud Motors in Slim-hole Horizontal Well that many have high flow conductivity in the earth formation, can play the effect reducing steam injection pressure, improve viscous crude fluid ability; And many wells on same plane, the effect increasing Area of a well, improve injection steam sweep area can be played, and the expense of radial bore is far below the expense of horizontal well drilling, the single well productivity of super Deep tight reservoir heavy crude reservoir therefore can be improved cost-effectively.Adopt the present invention, can reduce Wellhead steam injection pressure, steam injection mass dryness fraction improves 13%-25%, increases substantially single well productivity and the recovery percent of reserves of super Deep tight reservoir heavy crude reservoir, has huge economic benefit.
Accompanying drawing explanation
Fig. 1 is that radial bore of the present invention assists thermal recovery to improve the flow chart of a specific embodiment of the method for super Deep tight reservoir viscous crude single well productivity.
Detailed description of the invention
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As shown in Figure 1, Fig. 1 is that radial bore of the present invention assists thermal recovery to improve the flow chart of a specific embodiment of the method for super Deep tight reservoir viscous crude single well productivity.
In step 101, milling tool under lower going-into-well.Down-hole milling tool is drill bit+flexible shaft+down-hole motor+motor flexible pipe+coiled tubing.Flow process enters into step 102.
In step 102, down-hole milling tool is driven to output window on the sleeve pipe of destination layer position by down-hole motor.Sleeve pipe window diameter is about 20mm.Flow process enters into step 103.
In step 103, down-hole milling tool is proposed.Flow process enters into step 104.
In step 104, under enter the hydrajet tool connected with coiled tubing.Hydrajet tool is nozzle+jet hose+coiled tubing combination, and wherein nozzle diameter is 12.7mm, and coiled tubing diameter is 19mm.Flow process enters into step 105.
In step 105, pump into water under high pressure from ground, utilize water jet in destination layer, get out first branch well hole.The diameter of branch well hole is 40mm-50mm, about borehole length 100m.Flow process enters into step 106.
In step 106, the angle of conversion hydrajet tool, repeats step 105, continues operation, until the number of branch well hole reaches designing requirement.Flow process enters into step 107.
In step 107, propose hydrajet tool, carry out steam injection production.Flow process terminates.
In application embodiments of the invention 1, comprise the following steps:
1) spotting reservoir, reservoir effective thickness 4.8m, buried depth 1524.7m;
2) enter milling tool under, the sleeve pipe of target reservoir is outputed diameter 22mm window;
3) milling tool is proposed, with the water jet nozzle entering 12.7mm diameter under coiled tubing;
4) pump into high-pressure fluid from ground, start to bore first branch well hole, borehole diameter is 44mm, borehole length 82m;
5) continue construction after changing nozzle angle, finishing drilling forms 5 well branches, angle 72 ° between well;
6) steam injection after construction, steam injecting temperature 335 DEG C, mass dryness fraction 70.6%, pressure 15.2MPa, steam injection 1300t.
In application embodiments of the invention 2, comprise the following steps:
1) spotting reservoir, reservoir effective thickness 5.1m, buried depth 1622.9m;
2) enter milling tool under, the sleeve pipe of target reservoir is outputed diameter 24mm window;
3) milling tool is proposed, with the water jet nozzle entering 12.7mm diameter under coiled tubing;
4) pump into high-pressure fluid from ground, start to bore first branch well hole, borehole diameter is 50mm, borehole length 96m;
5) continue construction after changing nozzle angle, finishing drilling forms 4 well branches, angle 90 ° between well;
6) steam injection after construction, steam injecting temperature 336.1 DEG C, mass dryness fraction 73.2%, pressure 14.9MPa, steam injection 1100t.
In application embodiments of the invention 3, comprise the following steps:
1) spotting reservoir, reservoir effective thickness 4.2m, buried depth 1604.4m;
2) enter milling tool under, the sleeve pipe of target reservoir is outputed diameter 22mm window;
3) milling tool is proposed, with the water jet nozzle entering 12.7mm diameter under coiled tubing;
4) pump into high-pressure fluid from ground, start to bore first branch well hole, borehole diameter is 48mm, borehole length 102m;
5) continue construction after changing nozzle angle, finishing drilling forms 6 well branches, angle 60 ° between well;
6) steam injection after construction, steam injecting temperature 327.9 DEG C, mass dryness fraction 74.1%, pressure 14.2MPa, steam injection 1400t.
Claims (7)
1. radial bore assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, it is characterized in that, the method that this radial bore assists thermal recovery to improve super Deep tight reservoir viscous crude single well productivity comprises:
Step 1, milling tool under lower going-into-well;
Step 2, drives this down-hole milling tool to output window on the sleeve pipe of destination layer position by down-hole motor;
Step 3, proposes this down-hole milling tool;
Step 4, under enter the hydrajet tool connected with coiled tubing;
Step 5, pumps into water under high pressure from ground, utilizes water jet in destination layer, get out multiple branch well hole; And
Step 6, proposes this hydrajet tool, carries out steam injection production.
2. radial bore according to claim 1 assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, and it is characterized in that, this down-hole milling tool is drill bit+flexible shaft+down-hole motor+motor flexible pipe+coiled tubing.
3. radial bore according to claim 1 assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, and it is characterized in that, in step 2, the sleeve pipe window diameter that sleeve pipe is outputed is 20mm.
4. radial bore according to claim 1 assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, it is characterized in that, this hydrajet tool is nozzle+jet hose+coiled tubing combination.
5. radial bore according to claim 4 assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, and it is characterized in that, the nozzle diameter in this hydrajet tool is 12.7mm, and coiled tubing diameter is 19mm.
6. radial bore according to claim 1 assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, it is characterized in that, in steps of 5, water under high pressure is pumped into from ground, after utilizing water jet to get out first branch well hole in destination layer, the angle of conversion hydrajet tool, repeats in destination layer, get out multiple branch well hole, until the number of branch well hole reaches designing requirement.
7. radial bore according to claim 1 assists thermal recovery to improve the method for super Deep tight reservoir viscous crude single well productivity, and it is characterized in that, the diameter of multiple branch well hole is 40mm-50mm, borehole length 100m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410044953.8A CN104832140A (en) | 2014-02-07 | 2014-02-07 | Method of improving production capacity of super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410044953.8A CN104832140A (en) | 2014-02-07 | 2014-02-07 | Method of improving production capacity of super-deep low-permeability heavy oil single well by radial drilling and auxiliary thermal recovery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988681A (en) * | 2017-06-10 | 2017-07-28 | 大庆东油睿佳石油科技有限公司 | A kind of well-completing process of the spontaneous mixed phase hot fluid oil production method of horizontal well |
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| US4392530A (en) * | 1981-04-30 | 1983-07-12 | Mobil Oil Corporation | Method of improved oil recovery by simultaneous injection of steam and water |
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| CN202325239U (en) * | 2011-11-10 | 2012-07-11 | 中国石油天然气股份有限公司 | Hydraulic jetting radial drilling device |
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| CN203081296U (en) * | 2013-01-23 | 2013-07-24 | 中国石油化工股份有限公司 | Hydraulic jetting multi-nozzle radial drilling device |
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2014
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Patent Citations (5)
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| US4392530A (en) * | 1981-04-30 | 1983-07-12 | Mobil Oil Corporation | Method of improved oil recovery by simultaneous injection of steam and water |
| CN101210481A (en) * | 2006-12-29 | 2008-07-02 | 杜晓瑞 | Large curvature radiation horizontal well drilling technique and device |
| CN202325239U (en) * | 2011-11-10 | 2012-07-11 | 中国石油天然气股份有限公司 | Hydraulic jetting radial drilling device |
| CN102852505A (en) * | 2012-09-24 | 2013-01-02 | 于文英 | Oil production method for thin-medium thick layer super heavy oil hard-to-recover reserve |
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| 祝金利等: "多分支井技术在辽河稠油油藏中的应用", 《西安石油大学学报（自然科学版）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988681A (en) * | 2017-06-10 | 2017-07-28 | 大庆东油睿佳石油科技有限公司 | A kind of well-completing process of the spontaneous mixed phase hot fluid oil production method of horizontal well |
| CN106988681B (en) * | 2017-06-10 | 2019-01-08 | 大庆东油睿佳石油科技有限公司 | A kind of well-completing process of the spontaneous mixed phase hot fluid oil production method of horizontal well |
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Application publication date: 20150812 |