CN110439528B - Carbon dioxide acid fracturing method for low-permeability heterogeneous carbonate rock gas reservoir - Google Patents
Carbon dioxide acid fracturing method for low-permeability heterogeneous carbonate rock gas reservoir Download PDFInfo
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- CN110439528B CN110439528B CN201910843809.3A CN201910843809A CN110439528B CN 110439528 B CN110439528 B CN 110439528B CN 201910843809 A CN201910843809 A CN 201910843809A CN 110439528 B CN110439528 B CN 110439528B
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- 239000002253 acid Substances 0.000 title claims abstract description 125
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 49
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 18
- 239000011435 rock Substances 0.000 title description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 55
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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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
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- Engineering & Computer Science (AREA)
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- Environmental & Geological Engineering (AREA)
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- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
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Abstract
The invention disclosesA carbon dioxide acid fracturing method for a hypotonic heterogeneous carbonate gas reservoir, comprising the following steps: (1) introducing CO2Tank wagon, CO2The pump truck and the fracturing truck A are connected in series to a wellhead; (2) directly connecting the liquid tank, the acid tank A and the acid tank B with a low-pressure manifold; (3) connecting a low-pressure manifold, a sand mulling car, a fracturing car B and a high-pressure manifold in series to a wellhead; (4) at a speed of 1.0-1.5m3Injecting resistance reducing acid by a displacement pump per minute; (5) at 1.5-3.0m3Permin displacement pump CO injection2(ii) a (6) At 3.0-8.0m3Injecting slick water by a min displacement pump; (7) at 3.0-8.0m3Injecting resistance reducing acid by a displacement pump per minute; (8) at 2.0-6.0m3Injecting diverting acid by a displacement pump per minute; (9) repeating the steps (6) - (8) 0-2 times, and repeating the steps (6) - (7) 1 time; (10) and (5) injecting slick water by a pump. The method can improve acid fracturing effect and increase daily gas production.
Description
Technical Field
The invention belongs to the technical field of oil and gas field reservoir transformation, and particularly relates to a carbon dioxide acid fracturing method for a low-permeability heterogeneous carbonate rock gas reservoir.
Background
Along with the continuous deepening of the exploration and development degree of the domestic oil and gas reservoir, the physical characteristics of the oil and gas reservoir are poorer and poorer, and the reservoir is more compact. Acid fracturing (acid fracturing) is an effective measure for production and production increase of oil and gas wells, particularly for low-permeability heterogeneous carbonate gas reservoirs. The chemical reaction between acid liquor and rock on the wall of artificial (natural) crack forms a groove-shaped or uneven high-seepage channel, so that the seepage condition of the gas well is improved, and the yield of the gas well is increased.
In recent years, research on a carbon dioxide sand fracturing technology is carried out in a plurality of oil and gas fields in China, the technology is only applied to sandstone and shale oil and gas reservoirs, and a published technical document for applying carbon dioxide and acid fracturing to a hypotonic heterogeneous carbonate rock gas reservoir is not found.
The conventional acid fracturing method widely used at present has four problems: firstly, the whole process is carried out by using acid liquor, the acid liquor is a key joint making fluid and a crack wall etching reaction fluid, and physical and chemical filtration loss exists simultaneously, so that the filtration loss of the acid liquor is out of control, the acid liquor joint making efficiency is extremely low, a deep penetration complex joint net is difficult to form, and an oil-gas enrichment area cannot be effectively communicated; secondly, the filtration loss is reduced by improving the viscosity of the acid liquor on one side, the back drainage after pressing is difficult, and a large amount of high-viscosity acid liquor is retained in the stratum to cause the damage of a reservoir; thirdly, the acid rock reaction rate is high, a large amount of acid liquor loses activity in the crack of the near well bore, the effective acting distance of the acid liquor is limited, and the acid liquor cannot act on the deep part of the crack to form an effective seepage channel; fourthly, the consumption of acid liquor is large, which is not beneficial to environmental protection.
Disclosure of Invention
The invention aims to provide a carbon dioxide acid fracturing method for a low-permeability heterogeneous carbonate rock gas reservoir, which can effectively improve the acid fracturing effect, increase the daily gas production and meet the requirements of safe and environment-friendly production of oil and gas fields.
A carbon dioxide acid fracturing method for a hypotonic heterogeneous carbonate gas reservoir, comprising the steps of:
(1) introducing CO2Tank wagon, CO2The pump truck and the fracturing truck A are sequentially connected in series to be connected into a wellhead, and CO is2The tank car is filled with liquid CO2；
(2) Directly connecting a liquid tank, an acid tank A and an acid tank B with a low-pressure manifold, wherein the liquid tank is filled with slickwater, the acid tank A is filled with resistance-reducing acid, and the acid tank B is filled with diverting acid;
(3) sequentially connecting a low-pressure manifold, a sand mulling car, a fracturing car B and a high-pressure manifold in series to a wellhead;
(4) at a speed of 1.0-1.5m3The/min displacement pump injection is 10.0-30.0m3Reducing resistance acid;
(5) at 1.5-3.0m3The/min displacement pump injection is 100.0-300.0m3Liquid carbon dioxide;
(6) at 3.0-8.0m3The/min displacement pump injection is 80.0-200.0m3Sliding water;
(7) at 3.0-8.0m3The/min displacement pump injection is 80.0-200.0m3Reducing resistance acid;
(8) at 2.0-6.0m3The/min displacement pump is 60.0-200.0m3Diverting to an acid;
(9) repeating the steps (6) - (8) 0-2 times, and then repeating the steps (6) - (7) 1 time;
(10) at 2.0-6.0m3The/min displacement pump injection is 10.0-30.0m3And (5) sliding water.
Preferably, the amount of the distilled water, the resistance reducing acid and the diverting acid which are repeatedly pumped in the step (9) is higher than that of the previous operation.
Preferably, the CO is2A plurality of tank cars are arranged and are all directly connected with CO2The pump truck is connected.
Preferably, the number of the liquid tanks, the acid tank A and the acid tank B is multiple, and the liquid tanks, the acid tank A and the acid tank B are directly connected with a low-pressure manifold.
Preferably, the fracturing unit A is provided with a plurality of fracturing units A which are connected in parallel.
Preferably, the fracturing trucks B are in plurality and connected in parallel.
The invention has the beneficial effects that:
(1) in the carbon dioxide acid fracturing method provided by the invention, the used slickwater and the used resistance reducing acid are low-viscosity liquids, and meanwhile, the carbon dioxide is quickly gasified in the flowback process, so that the flowback rate can be greatly improved, and the damage to a reservoir stratum is effectively reduced;
(2) the liquid carbon dioxide pumped forms supercritical carbon dioxide under the condition of bottom hole temperature and pressure, diffuses into the deep part of the crack, and contacts with acid liquor at the later stage, so that the dual-retarding effect of chemistry and physics is achieved. In the aspect of chemical action, carbon dioxide and water are mutually dissolved to form a homoionic effect to inhibit the forward reaction of acid rock; in the aspect of physical action, the supercritical carbon dioxide has extremely high permeability and is adsorbed on the wall surface of a crack, so that the contact of acid liquor and rock is blocked. Under the dual actions of chemistry and physics, the acid rock reaction rate is reduced, the effective action distance of acid liquor is increased, and an effective seepage channel is formed at the deep part of an artificial crack;
(3) in the carbon dioxide acid fracturing method provided by the invention, the acid liquor has the functions of etching the artificial main crack to form an effective self-supporting seepage channel, etching and expanding the branch crack and temporarily blocking, and is not used as a key crack forming fluid or a crack wall etching fluid. According to the invention, multiple fluids are alternately injected, and the filtration is controlled by using the favorable characteristics of the various fluids, so that a deep-penetrating complex seam network is formed, and oil-gas enrichment areas can be effectively communicated;
(4) the carbon dioxide acid fracturing method provided by the invention reduces the using amount of acid liquor under the condition of the same construction scale and is suitable for the requirement of environmental protection.
Drawings
FIG. 1 is a schematic diagram of a layout of a surface facility for a carbon dioxide acid fracturing process according to the present invention.
Detailed Description
Example 1
A carbon dioxide acid fracturing method for a hypotonic heterogeneous carbonate gas reservoir, comprising the steps of:
(1) introducing CO2Tank wagon, CO2The pump truck and the fracturing truck A are sequentially connected in series to be connected into a wellhead, and CO is2The tank car is filled with liquid CO2；
(2) Directly connecting a liquid tank, an acid tank A and an acid tank B with a low-pressure manifold, wherein the liquid tank is filled with slickwater, the acid tank A is filled with resistance-reducing acid, and the acid tank B is filled with diverting acid;
(3) sequentially connecting a low-pressure manifold, a sand mulling car, a fracturing car B and a high-pressure manifold in series to a wellhead;
(4) at a speed of 1.0-1.5m3The/min displacement pump injection is 10.0-30.0m3Reducing resistance acid;
(5) at 1.5-3.0m3The/min displacement pump injection is 100.0-300.0m3Liquid carbon dioxide;
(6) at 3.0-8.0m3The/min displacement pump injection is 80.0-200.0m3Sliding water;
(7) at 3.0-8.0m3The/min displacement pump injection is 80.0-200.0m3Reducing resistance acid;
(8) at 2.0-6.0m3The/min displacement pump is 60.0-200.0m3Diverting to an acid;
(9) repeating the steps (6) - (8) 0-2 times, and then repeating the steps (6) - (7) 1 time;
(10) at 2.0-6.0m3The/min displacement pump injection is 10.0-30.0m3And (5) sliding water.
Example 2
The amount of the distillate, the retarding acid and the diverting acid which were pumped in step (9) was repeated based on example 1Are all higher than the previous operation; the CO is2A plurality of tank cars are arranged and are all directly connected with CO2The pump truck is connected. The plurality of liquid tanks, the plurality of acid tanks A and the plurality of acid tanks B are all directly connected with the low-pressure manifold; the fracturing trucks A are connected in parallel; the fracturing trucks B are connected in parallel; the ground equipment layout is shown in figure 1.
Example 3
On the basis of the embodiment 2, the carbonate reservoir of the X-well underground ancient China Majia ditch group is transformed, the target layer of the X-well carbonate reservoir is the ancient China Majia ditch group, the transformation layer section is 3965.5-3981.5 m, the effective thickness of the transformation layer section is 13.5m, and concentrated perforation is carried out near the upper part 3970.0-3972.0 of the reservoir. Design liquid carbon dioxide 150.0m3Resistance reducing acid 460.0m3Slick water 380.0m3Turn to acid 170.0m3；
The acid fracturing method comprises the following steps:
the pump injection steps of the carbon dioxide acid fracturing construction designed by the invention are as follows:
(1) at 1.0m3Permin displacement pump injection 20.0m3Reducing resistance acid;
(2) at 1.5m3Permin displacement pump injection 150.0m3Liquid carbon dioxide;
(3) at 3.5m3Permin displacement pump injection 80.0m3Sliding water;
(4) at 3.0m3Permin displacement pump injection 100.0m3Reducing resistance acid;
(5) at 2.5m3Permin displacement pump injection 80.0m3Diverting to an acid;
(6) at 4.5m3Permin displacement pump injection of 120.0m3Sliding water;
(7) at 4.0m3Permin displacement pump injection 140.0m3Reducing resistance acid;
(8) at 2.5m3Permin displacement pump injection 90.0m3Diverting to an acid;
(9) at 4.5m3Permin displacement pump injection of 160.0m3Sliding water;
(10) at 4.0m3Permin displacement pump injection 200.0m3Reducing resistance acid;
(11) at 3.0m3Permin displacement pump injection 20.0m3And (5) sliding water.
After reconstruction, the well flowback rate is 91.3 percent, and the daily gas production reaches 89.58 multiplied by 104m3/d。
The block only adopts conventional acid fracturing instead of carbon dioxide acid fracturing as a comparative example, after acid fracturing, the highest flowback rate is 67.6 percent, and the highest daily gas yield is only 43.26 multiplied by 104m3/d。
Example 4
On the basis of the embodiment 2, the XX underground ancient China Majia ditch group carbonate reservoir is modified, the target layer of the XX underground ancient China Majia ditch group carbonate reservoir is the ancient China Majia ditch group carbonate reservoir, the modified layer section is 3326.5-3355.0 m, the effective thickness of the modified layer section is 22.5m, and concentrated perforation is carried out near the upper part 3335.0-3339.0 of the reservoir. Design liquid carbon dioxide 300.0m3550.0m of resistance-reducing acid3510.0m of slick water3360.0m of steering acid3；
The acid fracturing method comprises the following steps:
the pump injection steps of the carbon dioxide acid fracturing construction designed by the invention are as follows:
(1) at 1.5m3Permin displacement pump injection 30.0m3Reducing resistance acid;
(2) at 3m3300.0 m/min displacement pump3Liquid carbon dioxide;
(3) at 6.0m3Permin displacement pump injection of 120.0m3Sliding water;
(4) at 6.0m3Permin displacement pump injection 140.0m3Reducing resistance acid;
(5) at 4.0m3Permin displacement pump injection of 160.0m3Diverting to an acid;
(6) at 8.0m3Permin displacement pump injection of 160.0m3Sliding water;
(7) at 8.0m3Permin displacement pump injection 180.0m3Reducing resistance acid;
(8) at 6.0m3Permin displacement pump injection 200.0m3Diverting to an acid;
(9) at 8.0m3Min row200.0m for measuring pump injection3Sliding water;
(10) at 8.0m3Permin displacement pump injection 200.0m3Reducing resistance acid;
(11) at 6.0m3Permin displacement pump injection 30.0m3And (5) sliding water.
After reconstruction, the well flowback rate is 89.8 percent, and the daily gas production reaches 135.07 multiplied by 104 m3/d。
The block only adopts conventional acid fracturing instead of carbon dioxide acid fracturing as a comparative example, after acid fracturing, the highest flowback rate is 70.2 percent, and the highest daily gas yield is only 73.15 multiplied by 104m3/d。
Example 5
On the basis of the embodiment 2, the XXX underground ancient China majia ditch group carbonate reservoir is transformed, a target layer of the XXX underground ancient China majia ditch group carbonate reservoir is the ancient China majia ditch group, the transformation layer section is 2910.0-2919.5 m, the effective thickness of the transformation layer section is 5.5m, and concentrated perforation is carried out on the transformation layer section close to 2913.5-2915.5 m of the upper portion of the reservoir. Design liquid carbon dioxide 100.0m3Resistance reducing acid 350.0m3330.0m of slick water3Turn to acid 160.0m3；
The acid fracturing method comprises the following steps:
the pump injection steps of the carbon dioxide acid fracturing construction designed by the invention are as follows:
(1) at 1.0m3Permin displacement pump injection 10.0m3Reducing resistance acid;
(2) at 1.5m3Permin displacement pump injection 100.0m3Liquid carbon dioxide;
(3) at 3.0m3Permin displacement pump injection 80.0m3Sliding water;
(4) at 3.0m3Permin displacement pump injection 80.0m3Reducing resistance acid;
(5) at 2.0m3Permin displacement pump injection 60.0m3Diverting to an acid;
(6) at 4.0m3Permin displacement pump injection 100.0m3Sliding water;
(7) at 4.0m3Permin displacement pump injection of 120.0m3Reducing resistance acid;
(8) at 2.0m3Permin displacement pump injection 100.0m3Diverting to an acid;
(9) at 4.0m3Permin displacement pump injection 140.0m3Sliding water;
(10) at 4.0m3Permin displacement pump injection 140.0m3Reducing resistance acid;
(11) at 2.0m3Permin displacement pump injection 10.0m3And (5) sliding water.
After reconstruction, the well flowback rate is 92.6 percent, and the daily gas production reaches 35.20 multiplied by 104 m3/d。
The block only adopts conventional acid fracturing instead of carbon dioxide acid fracturing as a comparative example, after acid fracturing, the highest flowback rate is 73.5 percent, and the highest daily gas yield is only 15.43 multiplied by 104m3/d。
In conclusion, the carbon dioxide acid fracturing method for the hypotonic heterogeneous carbonate rock gas reservoir provided by the invention effectively improves the acid fracturing effect and meets the requirements of safe and environment-friendly production of oil and gas fields.
Claims (1)
1. A carbon dioxide acid fracturing method for a hypotonic heterogeneous carbonate gas reservoir, which is characterized by comprising the following steps: the method comprises the following steps:
(1) introducing CO2Tank wagon, CO2The pump truck and the fracturing truck A are sequentially connected in series to be connected into a wellhead, and CO is2The tank car is filled with liquid CO2；
(2) Directly connecting a liquid tank, an acid tank A and an acid tank B with a low-pressure manifold, wherein the liquid tank is filled with slickwater, the acid tank A is filled with resistance-reducing acid, and the acid tank B is filled with diverting acid;
(3) sequentially connecting a low-pressure manifold, a sand mulling car, a fracturing car B and a high-pressure manifold in series to a wellhead;
(4) at a speed of 1.0-1.5m3The/min displacement pump injection is 10.0-30.0m3Reducing resistance acid;
(5) at 1.5-3.0m3The/min displacement pump injection is 100.0-300.0m3Liquid carbon dioxide;
(6) at 3.0-8.0m3The/min displacement pump injection is 80.0-200.0m3Sliding water;
(7) at 3.0-8.0m3The/min displacement pump injection is 80.0-200.0m3Reducing resistance acid;
(8) at 2.0-6.0m3The/min displacement pump is 60.0-200.0m3Diverting to an acid;
(9) repeating the steps (6) - (8) 0-2 times, and then repeating the steps (6) - (7) 1 time;
(10) at 2.0-6.0m3The/min displacement pump injection is 10.0-30.0m3Sliding water;
the liquid amounts of slickwater, resistance reducing acid and steering acid repeatedly pumped in the step (9) are all higher than those of the previous operation;
the CO is2A plurality of tank cars are arranged and are all directly connected with CO2The pump truck is connected;
the plurality of liquid tanks, the plurality of acid tanks A and the plurality of acid tanks B are all directly connected with the low-pressure manifold;
the fracturing trucks A are connected in parallel;
the fracturing unit B is provided with a plurality of fracturing units which are connected in parallel.
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| CN110761760A (en) * | 2019-11-22 | 2020-02-07 | 中国石油集团川庆钻探工程有限公司 | Acidification multistage liquid supply system and process for large-scale acidification reconstruction of oil and gas well |
| CN113187459B (en) * | 2021-06-03 | 2022-07-19 | 新疆恒洲景业石油技术服务有限公司 | Carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir transformation |
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| CN106285612A (en) * | 2015-05-25 | 2017-01-04 | 中国石油天然气股份有限公司 | Real-time acid concentration control method for acid fracturing of oil and gas field |
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| WO2019013855A1 (en) * | 2017-07-10 | 2019-01-17 | Exxonmobil Upstream Research Company | Methods for deep reservoir stimulation using acid-forming fluids |
| CN110159243A (en) * | 2019-05-27 | 2019-08-23 | 中国石油天然气股份有限公司 | Acid fracturing method for seam network of carbonate rock reservoir |
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Patent Citations (5)
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| CN103924955A (en) * | 2014-04-21 | 2014-07-16 | 陕西延长石油(集团)有限责任公司研究院 | Shale gas well CO2 and slickwater mixing fracturing technology |
| CN106285612A (en) * | 2015-05-25 | 2017-01-04 | 中国石油天然气股份有限公司 | Real-time acid concentration control method for acid fracturing of oil and gas field |
| CN107216867A (en) * | 2017-06-14 | 2017-09-29 | 陕西延长石油(集团)有限责任公司研究院 | A kind of low viscous drop resistance slippery water acid solution for Carbonate Reservoir |
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| CN110159243A (en) * | 2019-05-27 | 2019-08-23 | 中国石油天然气股份有限公司 | Acid fracturing method for seam network of carbonate rock reservoir |
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