CN105464639A - Bottom water reservoir fracturing method adopting water-deformable propping agent to control water breakthrough - Google Patents
Bottom water reservoir fracturing method adopting water-deformable propping agent to control water breakthrough Download PDFInfo
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- CN105464639A CN105464639A CN201511004131.8A CN201511004131A CN105464639A CN 105464639 A CN105464639 A CN 105464639A CN 201511004131 A CN201511004131 A CN 201511004131A CN 105464639 A CN105464639 A CN 105464639A
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- water
- oil
- fluid
- proppant
- fracturing
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/32—Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells
Abstract
The invention belongs to the technical field of oil production engineering and particularly relates to a bottom water reservoir fracturing method adopting a water-deformable propping agent to control water breakthrough. The bottom water reservoir fracturing method comprises the steps that 1, perforation is performed at the top position of a bottom water reservoir; 2, fracturing construction begins, an oil-based fracturing fluid is used as an ahead fluid to be injected into a stratum to cause crack initiation and make artificial fracture; 3, the oil-based fracturing fluid is adopted to carry the propping agent to flow into the stratum, wherein the propping agent does not change when encountering oil but is softened and produces deformation and solidification when encountering water; 4, the propping agent is softened and produces deformation and solidification to form a high-strength penetration-free blocking layer when encountering water in the fracturing construction process; 5, an oil-based fracturing fluid base fluid is used for replacing a sand-carrying fluid to flow into the stratum, wherein the using amount of the base fluid for replacement is equivalent to the volume of an operating tool string; 6, well shutdown is performed for 60 minutes, and blowout and production are performed. By the adoption of the bottom water reservoir fracturing method, the problem that existing cracks downwards extend to be communicated with bottom water, the blocking capability of an oil-water layer interface is improved through the water-deformable propping agent, and upward bottom water breakthrough is controlled.
Description
Technical field
The present invention relates to technical field of oil production engineering, be specifically related to a kind of employing and meet the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough.
Background technology
Water at the bottom of hyposmosis is grown oil reservoir and is had between oil water relation complexity, poor properties and oil-water-layer and block the geology characteristics such as ability, how by fracture height control in payzone, avoid linking up the key factor that end water is such reservoir reconstruction success.There is following subject matter in current existing remodeling method: poor properties, and perforation or acidifying ask primiparity without liquid measure; Oil-water-layer obstruction conditions is poor, be even directly connected, and three little one low (small displacement, low consumption of the liquid, little sand amount, low perforating degree) small scale fracturing easily makes seam height out of control, links up end water.Therefore need to find out a kind of method and block ability to increase between oil-water-layer, improve the compressive resistance of barrier bed, so not only between oil-water-layer, form higher stress difference when sand fracturing, and then fracture extends down into water layer and plays control action, and can bottom water coning be controlled again when producing after pressure, play the double action controlling the high longitudinal extension of seam and water blockoff.
Summary of the invention
The object of the invention is to overcome above-mentioned problems of the prior art, a kind of method is provided, can increase and block ability between oil-water-layer, improve the compressive resistance of barrier bed, not only between oil-water-layer, form higher stress difference when sand fracturing, and then fracture extends down into water layer and plays control action, and can bottom water coning be controlled again when producing after pressure, play the double action controlling the high longitudinal extension of seam and water blockoff.
Technical scheme of the present invention is: a kind of employing meets the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, comprises the steps:
(1) at bottom water reservoir tip position perforation;
(2) start pressing crack construction, adopt oil base fracturing fluid to inject as prepad fluid and make stratum crack initiation and make man-made fracture;
(3) adopt oil base fracturing fluid to carry proppant and enter stratum, described proppant need be met oil and any change not occurred, but meets water meeting deliquescing generation deformation and consolidation;
(4) in pressing crack construction process, proppant meets deliquescing generation deformation after water and consolidation, forms high strength, without permeability barrier bed;
(5) use oil base fracturing fluid base fluid to replace load fluid and enter stratum, wherein, the consumption of this replacement base fluid is equivalent to operating tool string volume;
(6) closing well 60 minutes, open flow and ask product.
The operation of above-mentioned steps (1) adopts the conventional firepower gun perforation process that Changqing oilfields is conventional, its perforation segment length 1-2 rice, Perforation Density 16 holes/rice, 60 degree, perforation phase angle; Or adopting hydraulic jet perforation technique, its perforation segment length 0.3 meter, if 6-8 preforation tunnel.
Its technique of pressing crack construction described in above-mentioned steps (2) adopts the oil pipe that Changqing oilfields is conventional to inject packer sand fracturing or hydraulic sand blasting fracturing technology.
Oil base fracturing fluid used in above-mentioned steps (2), step (3) and step (5), its formula is mixed by the one in crude oil or diesel oil, phosphate gelling agent, trivalent aluminium salt crosslinking agent and sodium acetate gel breaker and forms, and wherein phosphate gelling agent accounts for the mass percent of total solution is 1% ~ 2%; The mass percent that trivalent aluminium salt crosslinking agent accounts for total solution is 0.11% ~ 0.12%; The mass percent that sodium acetate gel breaker accounts for total solution is 0.11% ~ 3%.
In above-mentioned steps (3) and step (4), pressure break proppant used is by being that the cementing material of curing compound and natural siliceous sand Homogeneous phase mixing form with water; Described cementing material is mixed formed by linear polyacrylamide, Chrome crosslinking agent, silane coupler, and the weight ratio of these three kinds of compositions is followed successively by (10 ~ 20): (1 ~ 5): (0.3 ~ 1.0); Its particle diameter of described natural siliceous sand is 0.45mm ~ 0.8mm; Wherein the volume ratio of natural siliceous sand and cementing material is 100:(7 ~ 16).Complete consolidation time is in 60 minutes.
Beneficial effect of the present invention: the invention provides a kind of method realizing bottom water reservoir control hydraulic pressure and split, adopt a kind of with water be curing compound macromolecule glue cementing material composition fracturing propping agents, meet oil unchanged, meeting deliquescing generation deformation after chance water, the proppant deformation of finally compressing into end water section, to not having flow conductivity, plays the effect stoping water breakthrough.The invention solves existing crack and link up end water problem to downward-extension, block ability by what meet that water deformation proppant improves oil-water-layer interface, controlling the end waterbornely alters.It is moisture that the present invention is applicable to bottom, fracture height more difficult control during fracturing reform, and very easily pressure alters the reservoir of bottom aqueous layer.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is that oil base fracturing fluid of the present invention carries proppant and makes seam schematic diagram;
Fig. 2 is that water deformation consolidation schematic diagram met by proppant of the present invention.
Description of reference numerals: 1, oil reservoir; 2, water layer.
Detailed description of the invention
The invention provides a kind of employing and meet the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, adopt a kind of oil of meeting unchanged, the fracturing propping agents of meeting deliquescing generation deformation after chance water, the proppant deformation of finally compressing into end water section, to not having flow conductivity, plays the effect stoping water breakthrough.
The present invention operates in accordance with the following steps:
(1) at bottom water reservoir tip position perforation.
The operation of this step adopts the conventional firepower gun perforation process that Changqing oilfields is conventional, its perforation segment length 1-2 rice, Perforation Density 16 holes/rice, 60 degree, perforation phase angle; Or adopting hydraulic jet perforation technique, its perforation segment length 0.3 meter, if 6-8 preforation tunnel.
(2) start pressing crack construction, adopt the oil base fracturing fluid of some to inject as prepad fluid and make stratum crack initiation and make certain length man-made fracture.
Its technique of the pressing crack construction of this step adopts the oil pipe that Changqing oilfields is conventional to inject packer sand fracturing or hydraulic sand blasting fracturing technology.
(3) adopt oil base fracturing fluid to carry proppant and enter stratum, oil met by this proppant can not there is any change, see Fig. 1; But proppant meets water meeting deliquescing generation deformation and consolidation.
(4) in pressing crack construction process, after proppant chance water, meeting deliquescing generation deformation consolidation, forms high strength, without permeability barrier bed, see Fig. 2;
(5) use oil base fracturing fluid base fluid to replace load fluid and enter stratum, wherein, the consumption replacing base fluid is equivalent to operating tool string volume;
(6) closing well 60 minutes, open flow and ask product.
Closing well 60 minutes is to force closing up of cracks, and guarantees that proppant is met water deformation and attached to do not have flow conductivity completely simultaneously.
Wherein pressure break oil base fracturing fluid in step (2), (3), (5), its formula is mixed by the one in crude oil or diesel oil, phosphate gelling agent, trivalent aluminium salt crosslinking agent and sodium acetate gel breaker and forms, and wherein phosphate gelling agent accounts for the mass percent of total solution is 1% ~ 2%; The mass percent that trivalent aluminium salt crosslinking agent accounts for total solution is 0.11% ~ 0.12%; The mass percent that sodium acetate gel breaker accounts for total solution is 0.11% ~ 3%; The main purpose of oil base fracturing fluid be in order to carry proppant enter crack not with proppant generation deformation consolidation reaction.
Wherein step (3), in (4) pressure break proppant used by being that the cementing material of curing compound and natural siliceous sand Homogeneous phase mixing form with water; After injecting stratum, meet oily unchanged, after chance water, consolidation forms high strength, without permeability barrier bed, complete consolidation time is in 60 minutes.
The natural sand that quartz sand adopts Qingtongxia to produce, particle diameter is generally 0.45mm ~ 0.8mm; Cementing material is primarily of linear polyacrylamide, Chrome crosslinking agent, silane coupler composition, and the weight ratio of described three kinds of compositions is generally (10 ~ 20): (1 ~ 5): (0.3 ~ 1.0); The volume ratio of quartz sand and cementing material is 100:(7 ~ 16).
To sum up, the invention provides a kind of method realizing bottom water reservoir control hydraulic pressure and split, adopt a kind of with water be curing compound macromolecule glue cementing material composition fracturing propping agents, meet oil unchanged, meeting deliquescing generation deformation after chance water, the proppant deformation of finally compressing into end water section, to not having flow conductivity, plays the effect stoping water breakthrough.The present invention can solve existing crack and link up end water problem to downward-extension.The method blocks ability by what meet that water deformation proppant improves oil-water-layer interface, controls the end waterbornely to alter.
It is moisture that the present invention is applicable to bottom, fracture height more difficult control during fracturing reform, and very easily pressure alters the reservoir of bottom aqueous layer.
The part do not described in detail in present embodiment belongs to the known conventional means of the industry, does not describe one by one here.More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (5)
1. adopt and meet the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, it is characterized in that, comprise the steps:
(1) at bottom water reservoir tip position perforation;
(2) start pressing crack construction, adopt oil base fracturing fluid to inject as prepad fluid and make stratum crack initiation and make man-made fracture;
(3) adopt oil base fracturing fluid to carry proppant and enter stratum, described proppant need be met oil and any change not occurred, but meets water meeting deliquescing generation deformation and consolidation;
(4) in pressing crack construction process, proppant meets deliquescing generation deformation after water and consolidation, forms high strength, without permeability barrier bed;
(5) use oil base fracturing fluid base fluid to replace load fluid and enter stratum, wherein, the consumption of this replacement base fluid is equivalent to operating tool string volume;
(6) closing well 60 minutes, open flow and ask product.
2. a kind of employing as claimed in claim 1 meets the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, it is characterized in that, wherein the operation of step (1) adopts the conventional firepower gun perforation process that Changqing oilfields is conventional, its perforation segment length 1-2 rice, Perforation Density 16 holes/rice, 60 degree, perforation phase angle; Or adopting hydraulic jet perforation technique, its perforation segment length 0.3 meter, if 6-8 preforation tunnel.
3. a kind of employing as claimed in claim 1 meets the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, it is characterized in that, its technique of pressing crack construction wherein described in step (2) adopts the oil pipe that Changqing oilfields is conventional to inject packer sand fracturing or hydraulic sand blasting fracturing technology.
4. a kind of employing as claimed in claim 1 meets the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, it is characterized in that, wherein oil base fracturing fluid used in step (2), step (3) and step (5), its formula is mixed by the one in crude oil or diesel oil, phosphate gelling agent, trivalent aluminium salt crosslinking agent and sodium acetate gel breaker and forms, and wherein phosphate gelling agent accounts for the mass percent of total solution is 1% ~ 2%; The mass percent that trivalent aluminium salt crosslinking agent accounts for total solution is 0.11% ~ 0.12%; The mass percent that sodium acetate gel breaker accounts for total solution is 0.11% ~ 3%.
5. a kind of employing as claimed in claim 1 meets the bottom water reservoir fracturing process that water deformation proppant controls water breakthrough, it is characterized in that, wherein in step (3) and step (4) pressure break proppant used by being that the cementing material of curing compound and natural siliceous sand Homogeneous phase mixing form with water; Described cementing material is mixed formed by linear polyacrylamide, Chrome crosslinking agent, silane coupler, and the weight ratio of these three kinds of compositions is followed successively by (10 ~ 20): (1 ~ 5): (0.3 ~ 1.0); Its particle diameter of described natural siliceous sand is 0.45mm ~ 0.8mm; Wherein the volume ratio of natural siliceous sand and cementing material is 100:(7 ~ 16).
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| CN201511004131.8A CN105464639B (en) | 2015-12-29 | 2015-12-29 | A kind of bottom water reservoir fracturing process using chance water deformation proppant control water breakthrough |
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| CN201511004131.8A CN105464639B (en) | 2015-12-29 | 2015-12-29 | A kind of bottom water reservoir fracturing process using chance water deformation proppant control water breakthrough |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107418552A (en) * | 2017-08-14 | 2017-12-01 | 中国石油天然气股份有限公司 | A kind of water-swellable nano material and the water-control oil-increasing fracturing process based on this |
| CN108533241A (en) * | 2018-02-07 | 2018-09-14 | 中石油煤层气有限责任公司 | A kind of CBM Fracturing method |
| CN109779592A (en) * | 2018-12-28 | 2019-05-21 | 中国石油天然气股份有限公司 | A kind of perforation press cracking method of the old well longitudinal direction Tapping Residual Oil of single sand body oil reservoir |
| CN110984944A (en) * | 2019-11-22 | 2020-04-10 | 中国石油天然气股份有限公司 | Fracturing method for improving strip-shaped high-water-saturation reservoir development effect |
| US11168245B2 (en) | 2019-12-17 | 2021-11-09 | Saudi Arabian Oil Company | Heavy oil as fracturing fluid to increase hydraulic fracturing efficiency |
| CN114774103A (en) * | 2021-01-22 | 2022-07-22 | 中国石油化工股份有限公司 | Shear thickening polymer coated proppant and preparation method and application thereof |
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| CN104948161A (en) * | 2015-06-19 | 2015-09-30 | 中国石油化工股份有限公司 | Water controlling and acid fracturing method suitable for carbonate reservoir |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107418552A (en) * | 2017-08-14 | 2017-12-01 | 中国石油天然气股份有限公司 | A kind of water-swellable nano material and the water-control oil-increasing fracturing process based on this |
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| CN109779592A (en) * | 2018-12-28 | 2019-05-21 | 中国石油天然气股份有限公司 | A kind of perforation press cracking method of the old well longitudinal direction Tapping Residual Oil of single sand body oil reservoir |
| CN110984944A (en) * | 2019-11-22 | 2020-04-10 | 中国石油天然气股份有限公司 | Fracturing method for improving strip-shaped high-water-saturation reservoir development effect |
| US11168245B2 (en) | 2019-12-17 | 2021-11-09 | Saudi Arabian Oil Company | Heavy oil as fracturing fluid to increase hydraulic fracturing efficiency |
| CN114774103A (en) * | 2021-01-22 | 2022-07-22 | 中国石油化工股份有限公司 | Shear thickening polymer coated proppant and preparation method and application thereof |
| CN114774103B (en) * | 2021-01-22 | 2023-08-08 | 中国石油化工股份有限公司 | Shear thickening polymer coated propping agent and preparation method and application thereof |
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