CN111236915A - Fracturing method for aftereffect acid fracturing of carbonate rock after sand adding - Google Patents
Fracturing method for aftereffect acid fracturing of carbonate rock after sand adding Download PDFInfo
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- CN111236915A CN111236915A CN202010067711.6A CN202010067711A CN111236915A CN 111236915 A CN111236915 A CN 111236915A CN 202010067711 A CN202010067711 A CN 202010067711A CN 111236915 A CN111236915 A CN 111236915A
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- 239000002253 acid Substances 0.000 title claims abstract description 66
- 239000004576 sand Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 19
- 239000011435 rock Substances 0.000 title claims abstract description 18
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims abstract description 42
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims abstract description 21
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000004132 cross linking Methods 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 229920002907 Guar gum Polymers 0.000 claims description 6
- 229960002154 guar gum Drugs 0.000 claims description 6
- 235000010417 guar gum Nutrition 0.000 claims description 6
- 239000000665 guar gum Substances 0.000 claims description 6
- 241000361919 Metaphire sieboldi Species 0.000 abstract description 5
- 239000003208 petroleum Substances 0.000 abstract description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 7
- 229910052796 boron Inorganic materials 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- 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
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a fracturing method of carbonate rock after sand addition and acid fracturing, belonging to the field of petroleum fracturing operation. A fracturing method of carbonate rock after sand addition and acid fracturing comprises the following steps: 1) injecting the cross-linked guanidine gum and the ceramsite into a fracturing area through a fracturing unit, and forming a main crack and a branch crack which are paved with the ceramsite in the fracturing area; 2) and injecting high-viscosity acid liquor into the fracturing area through a fracturing unit, and corroding and expanding the main cracks and the branch cracks by the acid liquor to form a wormhole and crack connecting network. Finally, a fracture system which takes the sand-adding fracture as a main channel and the acid-etched earthworm holes as branch channels is formed, and the single-well yield can be improved.
Description
Technical Field
The invention belongs to the field of petroleum fracturing operation, and particularly relates to a fracturing method of carbonate rock after sand addition and acid fracturing.
Background
The carbonate rock oil gas reserves account for 52% of the total reserves in the world, and the recoverable reserves are ascertained to be 1434.5 million tons, wherein 750.1 million tons of petroleum, 684.4 million tons of natural gas are equivalent oil, and the oil gas yield accounts for about 60% of the total yield. In recent years, the exploration and development of carbonate reservoirs are gradually increased, and at present, for the transformation of the carbonate reservoirs, oil and gas fields at home and abroad mainly adopt multi-stage injection acid fracturing, temporary blocking and steering acid fracturing and horizontal well staged acid fracturing as main parts, and also have partial sand fracturing cases. The method is characterized in that the acid fracturing is simple and limited by an acid rock reaction mechanism, the formed acid-etched fracture is short, the flow conductivity of the acid-etched fracture is provided by uneven etching of a fracture surface, and if the reservoir is deep and the closing stress is high, the flow conductivity is greatly attenuated; the young modulus of the carbonate rock is high, the fracture joint develops compared with sandstone, the sand fracturing filtration loss is large, sand blocking is easy, and in addition, as chemical reaction is not generated with a reservoir stratum, although the fracture is long, acid-etched earthworm holes cannot be formed around the fracture, so that the communication radius is influenced.
Disclosure of Invention
The invention aims to overcome the defects of short acid fracturing crack, low flow conductivity at the far well end and small fracturing discharge radius in the prior art, and provides a fracturing method of effective acid fracturing after adding sand to carbonate rock.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a fracturing method of carbonate rock after sand addition and acid fracturing comprises the following steps:
1) injecting the cross-linked guanidine gum and the ceramsite into a fracturing area through a fracturing unit, and forming a main crack and a branch crack which are paved with the ceramsite in the fracturing area;
wherein the grain size of the ceramsite is 40-70 meshes, and the volume ratio of the ceramsite to the cross-linked guanidine gum is (5-10): 100, respectively;
2) injecting high-viscosity acid liquor into a fracturing area through a fracturing unit, and corroding and expanding main cracks and branch cracks by the acid liquor to form a wormhole and crack connecting network;
wherein the viscosity of the acid solution is more than 30mPa.s, and the injection amount of the acid solution is more than that of the cross-linked guar gum.
Further, the discharge capacity of acid injection in the step 2) is larger than that of the crosslinked guanidine gum and the ceramsite injected in the step 1).
Further, the volume ratio of the cross-linked guar gum in the step 1) to the acid solution in the step 2) is 1: 2.
furthermore, the cross-linked guanidine gum is an organic boron cross-linking system.
Further, the acid solution is a thickening acid or a crosslinking acid.
Compared with the prior art, the invention has the following beneficial effects:
the fracturing method of the carbonate rock after-sanding comprises a pre-sanding stage and a post-acid fracturing stage, wherein the long cracks and ceramsite are laid discontinuously through non-reactive fluid, and then the corrosion and expansion of main cracks and branch cracks are completed through large-discharge acid injection, so that a complex acid-etched earthworm hole and crack connection network is formed, and the modification volume and the drainage area are increased; the final fracture system takes sand-added fractures as a main channel, acid-etched earthworm holes as branch channels, the fracture length and the discharge radius are improved through effective combination of acid fracturing and fracturing, and more natural gas can be transported to the bottom of a well, so that the yield of a single well is improved.
Further, the discharge capacity of acid injection in the step 2) is larger than that of the crosslinked guanidine gum and the ceramsite injected in the step 1), cracks are formed in fracturing in the step 1), the filtration loss is increased during acid injection in the step 2), the discharge capacity of acid injection is large, the propelling distance of acid liquor is ensured, and the whole sand-added crack can be ensured to be reacted.
Further, the volume ratio of the cross-linked guar gum in the step 1) to the acid solution in the step 2) is 1: 2, enough acid liquor is used for ensuring the propelling depth.
Drawings
FIG. 1 is a schematic diagram of the principle of the fracturing method of the carbonate rock after sand addition and acid fracturing.
Wherein: 1-a guanidine gum storage tank; 2-acid tank; 3-sand mixing vehicle; 4-a fracturing unit; 5-a wellbore; 6-main crack; 7-ceramsite; 8-branch seam.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a schematic diagram of a fracturing method of carbonate rock after sand addition and acid fracturing, which comprises a pre-sand addition stage and a post-acid fracturing stage;
in the pre-sanding stage, cross-linked guanidine gum in a guanidine gum storage tank 1 enters a fracturing blender truck 3, is mixed with ceramsite in the fracturing blender truck 3, is injected into a shaft 5 through a fracturing unit 4 and acts on a fracturing area, and fracture forming and sanding are completed in the fracturing area through non-reactive fluid to form a main crack 6 and a branch crack 8 paved with ceramsite;
wherein, the ceramsite is 40-70 meshes, and the volume ratio of the cross-linked guanidine gum to the ceramsite is (5-10): 100, respectively;
in the post-acid fracturing stage, high-viscosity acid liquor in the acid tank 2 is injected into the shaft 5 through the fracturing unit 4 to act on a fracturing area, and large-discharge acid injection is performed to complete corrosion and expansion of a main crack and a branch crack, so that a complex acid-etched earthworm hole and crack connection network is formed, and the modification volume and the drainage area are increased;
the volume ratio of the acid solution to the cross-linked guar gum is 2: 1, the discharge capacity of the injection acid is larger than that of the crosslinked guanidine gum.
Example 1
(1) A low-displacement wellbore and setting a packer;
(2) injecting an organic boron crosslinking system to form a seam;
(3) and (3) injecting an organic boron crosslinking system to complete the addition of the sand into the ceramsite with the size of 40-70 meshes, wherein the volume ratio of the ceramsite to the crosslinked guanidine gum is 5: 100, respectively;
(4) after the sand is added, a section of guanidine gum base fluid is injected as a spacer fluid;
(5) the discharge capacity is improved, and thickening acid with the viscosity of 32mPa.s is injected;
(6) and injecting base liquid to replace the acid liquid into the stratum.
Example 2
(1) A low-displacement wellbore and setting a packer;
(2) injecting an organic boron crosslinking system to form a seam;
(3) and (3) injecting an organic boron crosslinking system to complete the addition of the sand into the ceramsite with the size of 40-70 meshes, wherein the volume ratio of the ceramsite to the crosslinked guanidine gum is 10: 100, respectively;
(4) after the sand is added, a section of guanidine gum base fluid is injected as a spacer fluid;
(5) the discharge capacity is improved, and crosslinking acid with the viscosity of 35mPa.s is injected;
(6) and injecting base liquid to replace the acid liquid into the stratum.
Example 3
(1) A low-displacement wellbore and setting a packer;
(2) injecting an organic boron crosslinking system to form a seam;
(3) and (3) injecting an organic boron crosslinking system to complete the addition of the sand into the ceramsite with 50-60 meshes, wherein the volume ratio of the ceramsite to the crosslinked guanidine gum is 8: 100, respectively;
(4) after the sand is added, a section of guanidine gum base fluid is injected as a spacer fluid;
(5) the discharge capacity is improved, and crosslinking acid with the viscosity of 50mPa.s is injected;
(6) and injecting base liquid to replace the acid liquid into the stratum.
In table 1, the pre-sanding post-effect acid fracturing pump injection procedure of example 1 in table 1 is used for carrying out a sanding post-effect acid fracturing test on 12 wells in a Changqing gas field, compared with similar reservoirs of adjacent wells, the average gas testing yield is increased from 3.83 ten thousand square/day to 5.22 ten thousand square/day, the yield is increased by 36%, and the popularization and application prospects are wide.
Table 1 post sand pre-acid fracturing pump injection procedure of example 1
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. A fracturing method of carbonate rock after sand addition and acid fracturing is characterized by comprising the following steps:
1) injecting the cross-linked guanidine gum and the ceramsite into a fracturing area through a fracturing unit, and forming a main crack and a branch crack which are paved with the ceramsite in the fracturing area;
wherein the grain size of the ceramsite is 40-70 meshes, and the volume ratio of the ceramsite to the cross-linked guanidine gum is (5-10): 100, respectively;
2) injecting high-viscosity acid liquor into a fracturing area through a fracturing unit, and corroding and expanding main cracks and branch cracks by the acid liquor to form a wormhole and crack connecting network;
wherein the viscosity of the acid solution is more than 30mPa.s, and the injection amount of the acid solution is more than that of the cross-linked guar gum.
2. The method for fracturing carbonate rock by post-acid fracturing with sand according to claim 1, wherein the discharge amount of acid injection in step 2) is larger than that of the crosslinked guanidine gum and ceramsite in step 1).
3. The method for fracturing carbonate rock by post-sanding acid fracturing according to claim 1, wherein the volume ratio of the cross-linked guar gum in step 1) to the acid liquor in step 2) is 1: 2.
4. the method for fracturing carbonate rock by post-sanding acid fracturing according to claim 1, wherein the crosslinked guanidine gum is an organoboron crosslinking system.
5. The method of carbonate rock sand aftereffect acid fracturing, according to claim 1, wherein said acid fluid is a viscosifying acid or a cross-linking acid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067711.6A CN111236915A (en) | 2020-01-20 | 2020-01-20 | Fracturing method for aftereffect acid fracturing of carbonate rock after sand adding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067711.6A CN111236915A (en) | 2020-01-20 | 2020-01-20 | Fracturing method for aftereffect acid fracturing of carbonate rock after sand adding |
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| CN202010067711.6A Pending CN111236915A (en) | 2020-01-20 | 2020-01-20 | Fracturing method for aftereffect acid fracturing of carbonate rock after sand adding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114718541A (en) * | 2021-01-05 | 2022-07-08 | 中国石油天然气股份有限公司 | Acidification process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083164A (en) * | 1992-07-01 | 1994-03-02 | 哈利伯顿公司 | Method of fracture acidizing subterranean formations |
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2020
- 2020-01-20 CN CN202010067711.6A patent/CN111236915A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114718541A (en) * | 2021-01-05 | 2022-07-08 | 中国石油天然气股份有限公司 | Acidification process |
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Application publication date: 20200605 |