CN111749665A - Gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing and using method - Google Patents
Gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing and using method Download PDFInfo
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- CN111749665A CN111749665A CN202010678127.4A CN202010678127A CN111749665A CN 111749665 A CN111749665 A CN 111749665A CN 202010678127 A CN202010678127 A CN 202010678127A CN 111749665 A CN111749665 A CN 111749665A
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- 239000006260 foam Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 88
- 239000007924 injection Substances 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000002253 acid Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000000605 extraction Methods 0.000 claims abstract description 10
- 239000003129 oil well Substances 0.000 claims abstract description 10
- 230000020477 pH reduction Effects 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 8
- 239000004088 foaming agent Substances 0.000 claims abstract description 7
- 239000003381 stabilizer Substances 0.000 claims abstract description 7
- 239000003349 gelling agent Substances 0.000 claims abstract description 4
- -1 fatty alcohol ammonium sulfate Chemical class 0.000 claims description 8
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 7
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 7
- 239000004202 carbamide Substances 0.000 claims description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 claims description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 5
- 239000008107 starch Substances 0.000 claims description 5
- 235000019698 starch Nutrition 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 3
- 230000004048 modification Effects 0.000 abstract description 3
- 239000003805 procoagulant Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 96
- 238000004519 manufacturing process Methods 0.000 description 52
- 230000002354 daily effect Effects 0.000 description 41
- 239000007788 liquid Substances 0.000 description 23
- 239000010410 layer Substances 0.000 description 21
- 239000004576 sand Substances 0.000 description 18
- 230000001965 increasing effect Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 239000010779 crude oil Substances 0.000 description 11
- 230000035699 permeability Effects 0.000 description 11
- 239000011148 porous material Substances 0.000 description 10
- 238000005187 foaming Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000003203 everyday effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- 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
-
- 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
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
-
- 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
- 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 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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing and a using method thereof, and solves the problems that the conventional temporary plugging agent is not matched in particle size, insufficient in strength, poor in stratum compatibility, incapable of effectively controlling water and high in water content of part of an oil well after repeated acidizing and fracturing modification for a long time. The invention comprises the following raw materials in parts by weight: gelling agent: 1.0-7.0 parts; foaming agent: 0.1-1.0 part; foam stabilizer: 0.1-0.6 part; procoagulant modulators: 0.1-0.5 part; and (3) water. Injecting a gel foam temporary plugging diverting agent into a water injection well or an oil well, then injecting gas, and forming the gel foam temporary plugging diverting agent in the process of moving a shaft and a stratum; finally, carrying out a normal acidification or fracturing process, and injecting acid liquor or fracturing fluid; and after the construction is finished, breaking the gel foam temporary plugging diverting agent system of the low-pressure permeable layer by water injection or oil extraction.
Description
The technical field is as follows:
the invention belongs to the technical field of acidizing and fracturing of oil and water wells in oil exploitation, and relates to a temporary plugging agent for acidizing and fracturing of oil and water wells in oil exploitation, in particular to a gel foam temporary plugging flow-dividing agent for acidizing and fracturing of a low-permeability oil field and a using method thereof.
Background art:
after the water injection oil field is exploited for a period of time, most of low-permeability oil layers are in a high-water-content state, crude oil controlled by old cracks is nearly completely exploited, and the cracks form a main water outlet channel.
At present, the traditional acidizing technology often causes the phenomenon of 'fingering' of acid liquor when carrying out conventional acidizing construction due to the heterogeneity of the stratum. The high-permeability large pore passage or crack is over-corroded, and finally the water outlet pore passage and the oil outlet pore passage are communicated with each other, so that the water content of the oil well is increased after conventional acidification, and the oil increasing effect is not obvious. The crude oil production controlled by the original cracks is close to the whole production, and the cracks form the main channel of water. The traditional fracturing has low success rate, low yield increase and short effective period, and after repeated fracturing, the fracture of a high-permeability area is further expanded, and the water content is continuously increased. The conventional temporary plugging acidification or temporary plugging fracturing technology has the defects that the temporary plugging agent is insufficient in strength, the particle size is not suitable for selection, and the adaptability to the stratum is poor, so that the pressure raising is insufficient, even the temporary plugging acidification or temporary plugging fracturing fails, and meanwhile, the common temporary plugging agent residue can cause certain damage to the stratum.
The invention content is as follows:
the invention aims to provide a gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing and a using method thereof, and solves the problems that the conventional temporary plugging agent is not matched in particle size, insufficient in strength, poor in stratum compatibility, incapable of effectively controlling water and high in water content of part of oil wells after repeated acidizing and fracturing modification for a long time. The foam is not influenced by the particle size, has higher foam strength and can effectively control water.
In order to achieve the purpose, the invention adopts the technical scheme that:
the gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing is characterized in that: the composite material comprises the following raw materials in parts by mass:
gelling agent: 1.0-7.0 parts;
foaming agent: 0.1-1.0 part;
foam stabilizer: 0.1-0.6 part;
a regulator: 0.1-0.5 part;
water;
the total amount of the above raw materials is 100 parts.
The raw materials are as follows:
the gel is water glass, and the modulus is 1.5-3.5;
the foam stabilizer is sodium carboxymethylcellulose or soluble starch;
the regulator is urea;
the foaming agent is one or more of sodium dodecyl sulfate, fatty alcohol ammonium sulfate or dodecyl dimethyl amine oxide.
A gel foam temporary blocking flow splitting agent acidizing and fracturing method is characterized by comprising the following steps: the method comprises the following steps:
injecting a gel foam temporary plugging diverting agent into a water injection well or an oil well, then injecting gas, and forming the gel foam temporary plugging diverting agent in the process of moving a shaft and a stratum; finally, carrying out a normal acidification or fracturing process, and injecting acid liquor or fracturing fluid; and after the construction is finished, breaking the gel foam temporary plugging diverting agent system of the low-pressure permeable layer by water injection or oil extraction.
Compared with the prior art, the invention has the following advantages and effects:
1. compared with the conventional chemical diverting agent, the gel foam temporary plugging diverting agent is not influenced by the particle size, has small secondary damage, lower cost and wider adaptability, and can easily control the temporary plugging depth.
2. The gel foam temporary plugging diverting agent combines the foam temporary plugging technology and the gel technology, has higher foam strength, greatly reduces the gas loss rate, has plugging property on a water outlet pore passage for a longer time after measures, and can greatly delay the water content rising.
3. The gel foam fluid has good carrying performance and good liquid carrying and sand carrying performances. After the measures, the elastic energy of foam injected into the stratum and the strong carrying capacity of the foam are utilized to carry and return the liquid (acid) from inside to outside in the stratum, so that the residual acid and pollutants are quickly carried out of the shaft, and the effect of physical blockage removal is achieved.
4. A large amount of active agents in the gel foam system have the effect of changing wettability, can keep the hydrophilicity of stratum rocks, and can play a role in changing phase permeation or wetting inversion to a certain extent.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific embodiments. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. The implementation conditions used in the examples can be further adjusted according to the specific experimental environment, and the implementation conditions not mentioned are generally the conditions in routine experiments.
The invention relates to a gel foam temporary plugging diverting agent for low-permeability oilfield acid fracturing and an acid fracturing method,
the gel foam temporary plugging diverting agent comprises the following raw materials in parts by mass:
gelling agent: 1.0-7.0 parts; the gel adopts water glass, and the modulus is 1.5-3.5;
foaming agent: 0.1-1.0 part; the foaming agent adopts one or more of lauryl sodium sulfate, fatty alcohol ammonium sulfate or lauryl dimethyl amine oxide;
foam stabilizer: 0.1-0.6 part; the foam stabilizer adopts sodium carboxymethylcellulose or soluble starch;
a regulator: 0.1-0.5 part; the regulator adopts urea;
water;
the total amount of the above raw materials is 100 parts.
The invention relates to a gel foam temporary plugging diverting agent acidizing and fracturing method, which is characterized by comprising the following steps: the method comprises the following steps:
injecting a gel foam temporary plugging diverting agent into a water injection well or an oil well, then injecting gas, and forming the gel foam temporary plugging diverting agent in the process of moving a shaft and a stratum; finally, carrying out a normal acidification or fracturing process, and injecting acid liquor or fracturing fluid; and after the construction is finished, breaking the gel foam temporary plugging diverting agent system of the low-pressure permeable layer by water injection or oil extraction.
Example (b):
example 1:
the gel foam temporary plugging diverting agent for the acid fracturing of the low-permeability oil field adopts the following raw materials in parts by mass:
water glass (modulus 3.3): 5 parts of a mixture;
sodium dodecyl sulfate and fatty alcohol ammonium sulfate (mass ratio of 1: 0.5): 0.5 part;
sodium carboxymethylcellulose: 0.6 part;
urea: 0.5 part;
92.9 parts of water;
the total amount of the above raw materials is 100 parts.
The preparation method of the gel foam temporary plugging diverting agent for the acid fracturing of the low-permeability oil field comprises the following steps: mixing the above raw materials at a certain proportion.
The method for acidizing and fracturing by adopting the gel foam temporary plugging diverting agent comprises the following steps:
the gel foam temporary plugging diverting agent is firstly injected into a water injection well or an oil well, then gas is injected, and the gel foam temporary plugging diverting agent is formed in the process of well bore and stratum migration. When foam moves in an oil layer, the foam does not integrally pass through a porous medium but firstly enters a high-permeability layer zone, when the foam passes through, enters and blocks a pore throat, a bubble interface deforms and generates resistance-a Jamin effect, the flow resistance of the foam is gradually increased, the injection pressure is correspondingly increased, and the foam enters or blocks other high-permeability layer zones along with the foam. The foam can continue to play the role in the process of moving to the deep part of the oil layer, so that the subsequent working fluid is turned to the oil layer with lower permeability, and an effective flow dividing effect is achieved. Mainly solves the problems of selective acidification and fracturing of heterogeneous strata, fractured strata and oil-water wells with outstanding contradictions in interlayer strata. And finally, carrying out a normal acidification or fracturing process, and injecting acid liquor or fracturing fluid. And after the construction is finished, breaking the gel foam temporary plugging diverting agent system of the low-pressure permeable layer by water injection or oil extraction. The gel foam temporary plugging diverting agent selectively enters and effectively plugs original cracks and large pore passages, and then new cracks are opened or working fluid enters middle and small pore passages to provide new oil flow passages, so that crude oil with the oil drainage area in the minimum stress direction or the direction close to the minimum main stress direction is extracted, and the purposes of controlling water and increasing oil are achieved.
In the actual use process, the system components can be properly adjusted according to the well type, the well condition, the water quality condition of injected water, formation water and the like.
The method comprises the following specific steps:
(1) replacing the active water;
(2) the gel foam temporary plugging diverting agent for acidizing and fracturing of the positive injection low-permeability oil field is calculated according to the volume of an oil pipe, and the average injection displacement is 400-600L/min;
(3) pressing and setting;
(4) the gel foam temporary plugging diverting agent for the acidizing and fracturing of the forward-extrusion low-permeability oil field accounts for 20-30% of the total amount, and the average injection displacement is 1000-3000L/min;
(5) the nitrogen is extruded positively and the rest gel foam temporary plugging diverting agent for the low-permeability oilfield acidizing and fracturing is used, and the average injection displacement is 1500-3000L/min;
(6) and (4) carrying out fracturing operation by using the normal fracturing fluid.
The active water mainly comprises the following components in parts by weight: 0.5 part of ammonium chloride, 0.5 part of alkylphenol polyoxyethylene and the balance of water.
Example 2:
the gel foam temporary plugging diverting agent for the acid fracturing of the low-permeability oil field adopts the following raw materials in parts by mass:
water glass (modulus 3.3): 1 part;
sodium dodecyl sulfate and fatty alcohol ammonium sulfate (mass ratio of 1: 0.6): 0.2 part;
soluble starch: 0.1 part;
urea: 0.5 part;
98.2 parts of water;
the total amount of the above raw materials is 100 parts.
The preparation method and the using method of the gel foam temporary plugging diversion agent are the same as in example 1.
Example 3:
the gel foam temporary plugging diverting agent for the acid fracturing of the low-permeability oil field adopts the following raw materials in parts by mass:
water glass (modulus 3.3): 7 parts;
fatty alcohol ammonium sulfate and dodecyl dimethyl amine oxide (mass ratio of 0.3: 1): 2 parts of (1);
sodium carboxymethylcellulose: 1 part;
urea: 0.1 part;
89.9 parts of water;
the total amount of the above raw materials is 100 parts.
The preparation method and the using method of the gel foam temporary plugging diversion agent are the same as in example 1.
Example 4:
the gel foam temporary plugging diverting agent for the acid fracturing of the low-permeability oil field adopts the following raw materials in parts by mass:
water glass (mode 3.3): 6.0 parts of (B);
fatty alcohol ammonium sulfate and dodecyl dimethyl amine oxide (mass ratio of 0.5: 1): 0.8 part;
soluble starch: 0.5 part;
urea: 0.6 part;
92.1 parts of water;
the total amount of the above raw materials is 100 parts.
The preparation method and the using method of the gel foam temporary plugging diversion agent are the same as in example 1.
Experimental example:
experimental example 1: (use of the flow-splitting agent prepared in example 1)
91-XX of oil production well field of certain large-scale ultra-low permeability oil field oil extraction F factory in the middle of China, the well is fractured and put into production in 2008 8 months, C4+52 2Adding sand 35.0m in layers3Discharge capacity of 2.2m3Min, the average sand ratio is 35.0 percent, the rupture pressure is 38.0MPa, the working pressure is 21.0MPa, the pump stopping pressure is 13.0MPa, and the daily pure oil produced by the test oil is 30.6 t. Initial daily liquid yield of 6.96m3The daily oil yield is 5.48t, the water content is 7.1%, the stable production is kept above 2.0t for a long time for 49 months, the water content starts to rise slowly in 9 months in 2012, the daily oil yield is 1.7t, the production is 50 months in 2019, the well fluid amount gradually decreases in 8 months, the water content gradually rises, and the characteristic of stratum blockage is presented. In 2018, the formation pressure measured in the region is 14.37MPa, the pressure is kept horizontal at 86.6%, the corresponding 2-hole water injection well injects water normally, and the accumulated water injection amount is 156209m in 4 months in 20193The formation energy is sufficient.
When the land 91-XX is treated by adopting the gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing, the gel foam temporary plugging diverting agent is injected for 20m3The injection discharge capacity is 500-1600L/min, and the ground volume (normal temperature and pressure) of injected nitrogen is 1800m3The injection pressure is 4.0-34.0 MPa.
The well adopts the above-mentioned coagulationThe daily liquid production before the gel foam temporary blocking flow divider is 1.5m3Daily oil yield is 0t, and water content is 100%. After the gel foam temporary plugging diverting agent is applied, the daily produced fluid of the oil production well is 6.14m32.89t of daily oil production and 48.3 percent of water. The yield of crude oil is increased by 230t in an accumulated way within a production period of 150 days.
Experimental example 2: (Using the flow-splitting agent prepared in example 2)
The oil extraction well tableland 95-xx of a certain large ultra-low permeability oilfield oil extraction F factory in the middle of China is positioned in the middle and north of the H57C8 oil reservoir, and 5 months in 2010 are aligned to C81 2Multi-stage sand fracturing of the layer (perforation section: 2590.0-2598.0m), one-stage sand addition: 35.0m3The discharge capacity: 2.2m3Min, sand ratio: 33.1 percent; secondary sand adding: 25.0m3The discharge capacity: 2.4m3Min, sand ratio: 31.3 percent; testing oil yield 22.3t per day and water yield 0m per day3。
The well has high initial production and 5.37m daily liquid33.85t of daily oil, and 15.6 percent of water. The yield is stabilized at about 3t all the time, water injection is started in 2016 (5) months, the effect is increased, and the daily yield is 4.21m31.19t of daily oil and 66.7 percent of water. The waterflooding adjustment was ineffective, after which high moisture production continued. The plugging characteristic appears in 2018 in 6 months, the daily liquid yield is 3.49m3, the oil content is 1.11t, and the water content is 62.6%. Daily liquid production 2.7m before the measure30.97t of daily oil production and 57.8 percent of water, and no measure is implemented in the well from the beginning of production operation to the time before the measure is carried out.
When the highland 95-xx is treated by adopting the gel foam temporary plugging diverting agent measure for low-permeability oilfield acidizing and fracturing, the gel foam temporary plugging diverting agent is injected for 20m3The injection discharge capacity is 400-1500L/min, and the ground volume (normal temperature and pressure) of the injected nitrogen is 1200m3The injection pressure is 3.0-11.5 MPa.
The daily liquid production of the well is 2.7m before the gel foam temporary plugging diverting agent is adopted30.9t of daily oil production and 57.8 percent of water. After the gel foam temporary plugging diverting agent is applied, the daily produced fluid of the oil production well is 5.83m33.52t of daily oil, 31.8 percent of water. And 204t of yield-increasing crude oil is accumulated in the production period of 92 days.
Experimental example 3: (Using the flow-splitting agent prepared in example 3)
174-XX of oil production well field of certain large ultra-low permeability oilfield oil extraction F factory in the middle of China, wherein the well is fractured and put into production in 5 months in 2010 at C81 1And 5.34t of daily oil production at the initial stage of production, then slowly reducing the yield, and keeping the daily oil production for more than 2.0t and stably producing for 61 months. The yield is reduced quickly from 7 months in 2015, the water content fluctuates, the preposed acid fracturing is implemented in 2016 and 3 months, the measure effect is better, the oil is increased by 1.4t every day, and the effective period is 9 months. And in 2017, the yield is suddenly reduced in 11 months, the oil is increased by 0.5t every day after sand washing and well washing are carried out, and the production is kept about 2.0t for a long time. Starting in 7 months in 2018, the well liquid amount slowly decreases, the water content slowly increases, and the liquid production is 1.26m in 2 months in 201930.57t of daily oil and 47.0 percent of water.
The well is positioned in a crack development area in the northwest of L1, and as the development time of water injection is prolonged, well groups are unevenly water-driven, and a water well 3 (ground 174-X4X, ground 172-XX and ground 174-X2X) appears, so that the well is deteriorated in efficiency; in view of the fact that the microsphere profile control and flooding is carried out on the corresponding water injection well, the water plugging fracturing effect is better when the water injection well is used for 174-X4X (the daily oil increment is 1.9t), and the water flooding condition is considered to be improved when the water injection well is used for 174-X2X to be overhauled and stopped; performing repeated fracturing measures in 2019 and 3 months, wherein the fracturing pressure is 37.8MPa, the working pressure is 28.9MPa, the pump stopping pressure is 15.1MPa, and the total liquid volume of the pump entering the field is 107.9m3Adding 15m of sand3Sand ratio of 19.5% and discharge capacity of 2.2-2.4m3Min, the effect of the extract after the measures is not obvious.
When the ground 174-XX is treated by adopting the gel foam temporary plugging diverting agent measure for low-permeability oilfield acidizing and fracturing, the gel foam temporary plugging diverting agent is injected for 20m3The injection discharge capacity is 500-2400L/min, and the ground volume (normal temperature and pressure) of nitrogen injection is 2000m3The injection pressure is 4.0-30 MPa.
The daily liquid production of the well is 1.92m before the gel foam temporary plugging diverting agent is adopted30.51t of daily oil and 68.8 percent of water. After the gel foam temporary plugging diverting agent is applied, the daily output of the oil production well is 2.86m31.67t of daily oil, and 50.3 percent of water. The yield-increased crude oil 104t is accumulated in the production period of 90 days.
Experimental example 4: (Using the flow-splitting agent prepared in example 4)
China middle part of China certain large ultra-low permeability oil field191-XX of oil production well of oil production F plant, which is located in the water-seeing area of the middle crack of L1 oil deposit, and C8 of fracture production in 5 months of 20091 1Layer, sand 50m3Sand ratio 35.0%, discharge capacity 2.4m3And/min, 35.7t of pure oil produced in oil testing day. Daily liquid of 6.38m at initial stage of production3The daily oil production is 4.45t, the yield is reduced to about 1.5t after the production is put into operation for 4 months and the production is stable, the depth of the well pump is deepened from 1600m to 2000m in 5 months in 2011, the yield is recovered to 3.7t, and the liquid production is recovered from 5.5 ↓2.9m in 6 months in 20123The liquid production in 2015 year 9 months is reduced to 0.82m30.31t of daily oil production and 56.1 percent of water. And pre-acid fracturing is carried out in 2016 and 3 months, and the productivity is restored to 1.6t and the water content is 52.2 percent. And in 2018, after 5 months, controlling the water content to gradually decrease to 10.2 percent, and increasing the productivity to 2.0 t.
The liquid production suddenly decreased to 1.47m in 11 months in 201830.31t of daily oil production and water content increased to 74.8 percent. The formation pressure measured by 190-XX1 wells near the well field in 2018 is 19.81MPa, and the formation pressure maintenance level is higher. The well corresponds to 2 water injection wells, and the accumulated water injection amount is 112059m before the stopping measure3And comprehensively analyzing and considering that the stratum of the well is blocked, and considering that the well has high water content history and water content rising risk at the early stage, implementing gel foam temporary blocking and flow dividing fracturing measures at this time to recover the productivity of the single well.
When the ground 174-XX is treated by adopting the gel foam temporary plugging diverting agent measure for low-permeability oilfield acidizing and fracturing, the gel foam temporary plugging diverting agent is injected for 20m3The injection discharge capacity is 450-1500L/min, and the ground volume (normal temperature and pressure) of injected nitrogen is 1600m3The injection pressure is 4.0-37.5 MPa.
The daily liquid production of the well is 0.89m before the gel foam temporary plugging diverting agent is adopted30.10t of daily oil production and 87.2 percent of water. After the gel foam temporary plugging diverting agent is applied, the daily production liquid of the oil production well is 2.49m31.19t of daily oil, and 47.4 percent of water. The yield increase crude oil is accumulated to 106t within the production period of 86 days.
The performance evaluation of the invention:
the results of the performance evaluation of the present invention are shown in Table 1
1. Foaming power: the gel foam temporary plugging diverting agent components obtained in the embodiments 1 to 4 are uniformly mixed, and about 200ml of gel foam temporary plugging diverting agent is measuredAdding the blocking and flow-dividing agent into a measuring cylinder, and recording the volume of liquid as V0After stirring with a CJ-3S type high speed stirrer Blenders at 11000r/min for 60S, the initial foam volume was recorded as V1And the test temperature is (25 Shi 1) DEG C, and the foaming force of the gel foam temporary plugging diverting agent is calculated. Foaming power (%) - (V)1-V0。)/V0
2. Foam half life: the components of the gel foam temporary plugging and shunting agent obtained in the embodiment 1-4 are uniformly mixed, 200ml of the gel foam temporary plugging and shunting agent is measured, CJ-3S type high-speed stirrer Blenders are used, the rotating speed is 11000r/min, standing observation is carried out after stirring is carried out for 60 seconds, and the time required by half of the volume of the experimental liquid of foam precipitation is measured by a stopwatch, namely the half-life of the foam.
3. Temperature and aging resistance
Uniformly mixing the components of the gel foam temporary plugging and shunting agent obtained in the embodiment 1-4, measuring about 1000ml of the gel foam temporary plugging and shunting agent, keeping the temperature at 60 ℃ for 30min, cooling to room temperature (25 cm 1) DEG C, and measuring the foaming power and the foam half-life period of the gel foam temporary plugging and shunting agent according to the steps 1 and 2.
4. Salt resistance
Preparing standard saline III according to the standard 5.2.3 clause of SY/T5862-2008, taking 200ml of the gel foam temporary plugging and shunting agent obtained in the examples 1-4, and measuring the foaming power and the foam half-life of the gel foam temporary plugging and shunting agent according to the steps 1 and 2 at room temperature (25 seconds 1) DEG C.
TABLE 1
5. Application experiments: and (3) starting a pump, injecting the temporary plugging diverting agent which is replacing part of the gel foam obtained in the example 1, pressing, setting, extruding nitrogen and the temporary plugging diverting agent of the rest gel foam, and then performing normal fracturing construction. The gel foam temporary plugging diverting agent obtained in the example 2, the example 3 and the example 4 is subjected to temporary plugging construction on other three wells by adopting the same process method. The specific effect is detailed in the examples, and the comparison of the effect of the measures is briefly illustrated in Table 2.
TABLE 2
From the test results in tables 1 and 2, it can be seen that the gel foam temporary plugging diverting agent obtained by the invention has very high foaming force, good foam stability and good temperature and salt resistance of the system, selectively enters and effectively plugs the original cracks and large pore passages, and then opens new cracks or enables working fluid to enter middle and small pore passages to provide new oil flow passages, thereby extracting crude oil in the minimum stress direction or the oil drainage area close to the minimum principal stress direction, and realizing water control and oil increase. It is especially suitable for low permeability oil field.
Experimental example:
the oil recovery well tableland 95-xx of a certain large-scale ultra-low permeability oilfield oil extraction F factory in the middle of China is positioned in the middle and north of the H57C8 oil reservoir, and 5 months in 2010 are aligned to C81 2Multi-stage sand fracturing of the layer (perforation section: 2590.0-2598.0m), one-stage sand addition: 35.0m3The discharge capacity: 2.2m3Min, sand ratio: 33.1 percent; secondary sand adding: 25.0m3The discharge capacity: 2.4m3Min, sand ratio: 31.3 percent; testing oil yield 22.3t per day and water yield 0m per day3。
The well has high initial production and 5.37m daily liquid33.85t of daily oil, and 15.6 percent of water. The yield is stabilized at about 3t all the time, water injection is started in 2016 (5) months, the effect is increased, and the daily yield is 4.21m31.19t of daily oil and 66.7 percent of water. The waterflooding adjustment was ineffective, after which high moisture production continued. The plugging characteristic appears in 2018 in 6 months, the daily liquid yield is 3.49m3, the oil content is 1.11t, and the water content is 62.6%. Daily liquid production 2.7m before the measure30.97t of daily oil production and 57.8 percent of water, and no measure is implemented in the well from the beginning of production operation to the time before the measure is carried out.
The tableland 95-xx is injected when treated by adopting the gel foam temporary plugging diverting agent measure for the low-permeability oilfield acidizing and fracturing prepared in example 1The foam gel water shutoff profile control agent is 20m3The injection discharge capacity is 400-1500L/min, and the ground volume (normal temperature and pressure) of the injected gas is 3300m3The injection pressure is 3.0-11.5 MPa.
The oil pressure of the well before the profile control agent is adopted is 8.4Mpa, and the casing pressure is 8.4 Mpa. After the profile control agent is applied, the pressure of the water injection well rises: the oil pressure is 11.8Mpa, the casing pressure is 11.5Mpa, the water content of 2 oil wells in the corresponding well group is reduced by 19.9 percent, and the crude oil is increased by 344.9t in a cumulative way in a half-year statistical period.
The temporary plugging and shunting technology is mainly used for solving the layer positions with complex oil-water relationship and very developed microcracks in oil layers. After a period of exploitation in a water-injected oil field, most low-permeability oil layers are in a high-water-content state, crude oil controlled by old cracks is nearly completely extracted, the cracks form main water outlet channels, but certain wells have certain residual extractable storage capacity under the existing exploitation conditions, in order to control water and increase oil and fully exert the production potential of the oil well, the invention adopts a plugging agent to selectively enter and effectively plug original cracks and large channels, and then opens new cracks or enables working fluid to enter the middle and small channels to provide new oil flow channels, thereby extracting the crude oil with the minimum stress direction or the oil drainage area close to the minimum main stress direction and controlling water and increasing oil.
When the foam moves in the oil layer, the foam does not integrally pass through the porous medium, but firstly enters the high-permeability layer belt. When the foam passes through, enters and blocks the pore throat, the interface of the foam deforms and generates resistance-Jamin effect, the flow resistance of the foam is gradually increased, the injection pressure is correspondingly increased, and the foam enters or blocks other higher permeable layer zones. The foam can continue to play the role in the process of moving to the deep part of the oil layer, so that the subsequent working fluid is turned to the oil layer with lower permeability, and an effective flow dividing effect is achieved.
The foam has a remarkable characteristic, the higher the permeability is, the more favorable the generation and existence of the foam is, the larger the resistance coefficient or resistance factor is, and the better the shunting effect is; in the oil-containing area with low permeability, foam is not easy to generate and exist, the generated resistance is correspondingly reduced, and the blocking effect is much smaller. The selective plugging is a selective plugging with high plugging, no plugging and low plugging, the permeability of a low-permeability oil-rich zone is not damaged, and the recovery ratio is greatly improved.
The above embodiments are merely illustrative of the principles and effects of the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (3)
1. The gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing is characterized in that: the composite material comprises the following raw materials in parts by mass:
gelling agent: 1.0-7.0 parts;
foaming agent: 0.1-1.0 part;
foam stabilizer: 0.1-0.6 part;
a regulator: 0.1-0.5 part;
water;
the total amount of the above raw materials is 100 parts.
2. The gel foam temporary plugging diverting agent for low-permeability oilfield acidizing and fracturing as claimed in claim 1, wherein the gel foam temporary plugging diverting agent comprises the following components in percentage by weight:
the gel is water glass, and the modulus is 1.5-3.5;
the foam stabilizer is sodium carboxymethylcellulose or soluble starch;
the regulator is urea;
the foaming agent is one or more of sodium dodecyl sulfate, fatty alcohol ammonium sulfate or dodecyl dimethyl amine oxide.
3. A method for temporarily blocking acidizing and fracturing by using the gel foam flow splitting agent according to claim 1, which is characterized by comprising the following steps: the method comprises the following steps:
injecting a gel foam temporary plugging diverting agent into a water injection well or an oil well, then injecting gas, and forming the gel foam temporary plugging diverting agent in the process of moving a shaft and a stratum; finally, carrying out a normal acidification or fracturing process, and injecting acid liquor or fracturing fluid; and after the construction is finished, breaking the gel foam temporary plugging diverting agent system of the low-pressure permeable layer by water injection or oil extraction.
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| CN111454703A (en) * | 2020-04-08 | 2020-07-28 | 宁夏朔光石油科技有限公司 | Formula and using method of composite temporary plugging agent for temporary plugging acidification of horizontal well |
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