CN111502629A - Tectorial membrane solid acid suitable for carbonate rock reservoir degree of depth acid fracturing - Google Patents
Tectorial membrane solid acid suitable for carbonate rock reservoir degree of depth acid fracturing Download PDFInfo
- Publication number
- CN111502629A CN111502629A CN202010503203.8A CN202010503203A CN111502629A CN 111502629 A CN111502629 A CN 111502629A CN 202010503203 A CN202010503203 A CN 202010503203A CN 111502629 A CN111502629 A CN 111502629A
- Authority
- CN
- China
- Prior art keywords
- acid
- solid acid
- monomer
- coated solid
- deep
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002253 acid Substances 0.000 title claims abstract description 81
- 239000011973 solid acid Substances 0.000 title claims abstract description 64
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 27
- 239000011435 rock Substances 0.000 title abstract description 20
- 210000002489 tectorial membrane Anatomy 0.000 title description 7
- 239000000178 monomer Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims description 28
- 238000000576 coating method Methods 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 28
- 229920000642 polymer Polymers 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical group C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001694 spray drying Methods 0.000 claims description 5
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 4
- FYRWKWGEFZTOQI-UHFFFAOYSA-N 3-prop-2-enoxy-2,2-bis(prop-2-enoxymethyl)propan-1-ol Chemical compound C=CCOCC(CO)(COCC=C)COCC=C FYRWKWGEFZTOQI-UHFFFAOYSA-N 0.000 claims description 4
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 4
- JQRRFDWXQOQICD-UHFFFAOYSA-N biphenylen-1-ylboronic acid Chemical compound C12=CC=CC=C2C2=C1C=CC=C2B(O)O JQRRFDWXQOQICD-UHFFFAOYSA-N 0.000 claims description 4
- XKJCHHZQLQNZHY-UHFFFAOYSA-N phthalimide Chemical compound C1=CC=C2C(=O)NC(=O)C2=C1 XKJCHHZQLQNZHY-UHFFFAOYSA-N 0.000 claims description 4
- KNCYXPMJDCCGSJ-UHFFFAOYSA-N piperidine-2,6-dione Chemical compound O=C1CCCC(=O)N1 KNCYXPMJDCCGSJ-UHFFFAOYSA-N 0.000 claims description 4
- PEEHTFAAVSWFBL-UHFFFAOYSA-N Maleimide Chemical compound O=C1NC(=O)C=C1 PEEHTFAAVSWFBL-UHFFFAOYSA-N 0.000 claims description 2
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 16
- 238000005260 corrosion Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 5
- 230000000979 retarding effect Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 238000013270 controlled release Methods 0.000 abstract 1
- 239000003431 cross linking reagent Substances 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 21
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 12
- 239000012530 fluid Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- HQWPLXHWEZZGKY-UHFFFAOYSA-N diethylzinc Chemical compound CC[Zn]CC HQWPLXHWEZZGKY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
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
- C09K8/60—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
- C09K8/725—Compositions containing polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a coated solid acid suitable for deep acid fracturing of a carbonate reservoir, which consists of an internal solid acid and an external coated material, wherein the external coated material comprises 35-55% of a water-soluble skeleton monomer, 25-35% of an acid-resistant monomer, 10-15% of a temperature-resistant monomer and 10-15% of a strength monomer by mass. The coated solid acid provided by the invention has a self-controlled release function, is good in retarding and corrosion inhibiting properties, can effectively reduce the acid-rock reaction speed, increases the action distance of acid liquor, and improves the flow conductivity of a far-end crack; meanwhile, the preparation process is simpler and the cost is lower; in addition, the coated solid acid provided by the invention reduces the dependence on materials with larger pollution such as a cross-linking agent and the like in the application process, greatly reduces the damage to the stratum and reduces the pollution to the stratum.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a coated solid acid suitable for deep acid fracturing of a carbonate reservoir.
Background
With the rapid development of the global oil and gas industry, oil and gas exploration and development rapidly extend from a shallow layer to a deep layer and an ultra-deep layer, medium and low temperature to high temperature and ultra-high temperature, and a high-temperature deep carbonate reservoir layer becomes a key point. The high-temperature carbonate reservoir matrix has low permeability and low natural productivity, and acid fracturing modification is generally carried out during well completion to improve the reservoir and improve the productivity. For a high-temperature carbonate rock reservoir with a reservoir body far away from a shaft or ultra-low hole and ultra-low permeability, only by adopting a deep acid fracturing modification process, the acid corrosion joint length can be increased to the maximum extent, the seepage area is enlarged, and the effective yield increase is realized.
The high formation temperature brings a difficult problem to the deep acid fracturing reformation of the high-temperature carbonate reservoir. The acid-rock reaction speed is accelerated under the high temperature condition, the effective action distance of the acid liquor is greatly reduced, the engineering effect of yield increase transformation is seriously influenced, and higher requirements are provided for the high-temperature corrosion inhibition performance of an acid liquor system. At present, the engineering mainly comprises the following solutions: pre-liquid injection, construction discharge capacity improvement, multi-stage alternate injection and use of retarding acid.
The pad fluid can only reduce the temperature of the near wellbore zone, and the temperature of the far end of the crack is difficult to reduce; the construction pressure can be increased by increasing the construction displacement, and the requirements on construction safety and equipment performance are higher; the alternate injection requires a large amount of liquid, which inevitably increases construction costs. The retarded acid is more commonly used for deep acid fracturing of high-temperature carbonate rocks, and the high-temperature retarding and corrosion inhibiting performance of an acid liquor system has higher standards, so that the acid liquor system still has certain corrosion capacity at high temperature and far well ends.
The existing acid liquor system with high-temperature retarding and corrosion inhibiting properties comprises emulsified acid, organic acid, thickening acid, foam acid, authigenic acid, solid acid and the like. The solid acid is separated from the carrying fluid by wrapping the solid hydrochloric acid, the nitric acid, the citric acid and the like with the coating material, and the solid acid is released under specific conditions by controlling the solubility of the coating material to achieve the purpose of acid penetration depth, but the performances of corrosion inhibition, speed slowing and the like are not ideal enough.
Therefore, a more efficient film-coated solid acid suitable for deep acid fracturing of a carbonate reservoir is needed, so that the acid penetration depth is effectively increased, the effective acid corrosion seam length is increased, the acid corrosion crack flow conductivity is improved, and the acid fracturing modification effect of a high-temperature deep carbonate reservoir is improved.
Disclosure of Invention
The invention aims to provide more efficient film-coated solid acid suitable for deep acid fracturing of carbonate reservoirs aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems comprises the following contents:
the coated solid acid suitable for deep acid fracturing of carbonate rock reservoir consists of internal solid acid and external coating material, and the external coating material consists of water soluble skeleton monomer 35-55 wt%, acid resisting monomer 25-35 wt%, temperature resisting monomer 10-15 wt% and strength monomer 10-15 wt%.
Further, the backbone monomer is ethylene oxide.
Further, the acid-resistant monomer is one or more of n-butyl acrylate, glycidyl methacrylate and hydroxyethyl methacrylate.
Further, the temperature-resistant monomer is one or more of phthalimide, glutarimide and maleimide.
Further, the strength monomer is one or two of pentaerythritol triallyl ether and trimethylolpropane diallyl ether.
In the technical scheme, the skeleton monomer is mainly used for increasing the length of the carbon chain, and the acid-resistant monomer, the temperature-resistant monomer and the strength monomer are respectively used for increasing the acid resistance, the temperature resistance and the anti-tensile wear resistance of the film coating material.
The coated solid acid suitable for deep acid fracturing of the carbonate reservoir comprises the following preparation steps of:
1) adding 35-55% of water-soluble skeleton monomer, 25-35% of acid-resistant monomer, 10-15% of temperature-resistant monomer and 10-15% of strength monomer into an anhydrous and oxygen-free pressure-resistant bottle according to the mass ratio, and continuously adding a polymerization solvent and a catalyst;
2) sealing, shaking, and standing in a water bath at constant temperature of 45-60 deg.C for 60-80 min;
3) separating the generated polymer from the liquid, and drying the polymer in vacuum to obtain the external coating material.
The method is characterized in that the step of externally coating the internal solid acid comprises the following steps:
1) dissolving an external coating material in absolute ethyl alcohol, wherein the mass ratio of the external coating material to the absolute ethyl alcohol is 1:8-1:6, so as to prepare a feed liquid;
2) and coating the solution on the solid acid by adopting a microcapsule coating technology, wherein the mass ratio of the solution to the solid acid is 1:1-2:1, so that the preparation of the coated solid acid is completed.
The release process of the solid acid in the coated solid acid provided by the invention is influenced by H+Concentration and temperature control, i.e. H in the wellbore near the fracture due to carrier fluid+The concentration is high, the temperature of the carrying fluid is relatively low, the outer coating material has a protection effect on the solid acid inside, the solid acid inside is not released, and H in the carrying fluid is not released+The main function is played; as the fracture gradually expands, the acid rock reaction consumes H in the carrier fluid+And the temperature of the carrying fluid is gradually increased, the outer coating material is gradually reacted, and the solid acid in the inner part begins to release H+And plays a role in etching the crack wall surface at the far end.
The invention has the beneficial effects that: compared with the existing coated acid, the coated solid acid provided by the invention has more excellent carrying performance, self-control release function, better slow speed and corrosion inhibition performance, can effectively reduce the acid-rock reaction speed, increase the acid liquid action distance and improve the flow conductivity of a far-end crack; the preparation process of the film-coated solid acid provided by the invention is simpler and has lower cost; meanwhile, the tectorial membrane solid acid provided by the invention reduces the dependence on chemical additives in the application process, greatly reduces the damage to the stratum and reduces the pollution to the stratum. In conclusion, the coated solid acid provided by the invention has the characteristics of greenness, high efficiency, safety and environmental protection.
Drawings
FIG. 1 is a schematic diagram showing the comparison of the effective working distance of a conventional acid solution with that of a coated solid acid.
Detailed Description
The present invention will be described in detail with reference to the following examples, which should be construed as merely illustrative and explanatory of the present invention and not restrictive thereof.
Example 1
A tectorial membrane solid acid suitable for carbonate reservoir deep acid fracturing, the preparation process is as follows:
1) adding 50g of ethylene oxide, 30g of hydroxyethyl methacrylate, 10g of phthalimide and 10g of pentaerythritol triallyl ether into an anhydrous and oxygen-free pressure-resistant bottle, continuously adding 150g of benzene and 10g of diethyl zinc, sealing, shaking up, standing in a constant-temperature water bath kettle at 50 ℃ for 70min, separating the generated polymer from liquid, and drying the polymer in vacuum to obtain an external coating material;
2) dissolving 10g of the film-coated material in 70g of absolute ethyl alcohol to prepare a feed liquid;
3) and coating 30g of feed liquid on 20g of solid hydrochloric acid by adopting a spray drying method to prepare the film-coated solid acid.
Example 2
A tectorial membrane solid acid suitable for carbonate reservoir deep acid fracturing, the preparation process is as follows:
1) adding 45g of ethylene oxide, 25g of hydroxyethyl methacrylate, 15g of phthalimide and 15g of pentaerythritol triallyl ether into an anhydrous and oxygen-free pressure-resistant bottle, continuously adding 150g of benzene and 10g of diethyl zinc, sealing, shaking up, standing in a constant-temperature water bath kettle at 50 ℃ for 70min, separating the generated polymer from liquid, and drying the polymer in vacuum to obtain an external coating material;
2) dissolving 10g of the film-coated material in 70g of absolute ethyl alcohol to prepare a feed liquid;
3) and coating 30g of feed liquid on 20g of solid hydrochloric acid by adopting a spray drying method to prepare the film-coated solid acid.
Example 3
A tectorial membrane solid acid suitable for carbonate reservoir deep acid fracturing, the preparation process is as follows:
1) adding 50g of ethylene oxide, 30g of epoxypropyl methacrylate, 10g of glutarimide and 10g of trimethylolpropane diallyl ether into an anhydrous and oxygen-free pressure-resistant bottle, continuously adding 150g of benzene and 10g of diethyl zinc, sealing, shaking up, standing in a 50 ℃ constant-temperature water bath kettle for 70min, separating the generated polymer from liquid, and drying the polymer in vacuum to obtain an external coating material;
2) dissolving 10g of the film-coated material in 70g of absolute ethyl alcohol to prepare a feed liquid;
3) and coating 30g of feed liquid on 20g of solid hydrochloric acid by adopting a spray drying method to prepare the film-coated solid acid.
Example 4
A tectorial membrane solid acid suitable for carbonate reservoir deep acid fracturing, the preparation process is as follows:
1) adding 45g of ethylene oxide, 25g of epoxypropyl methacrylate, 15g of glutarimide and 15g of trimethylolpropane diallyl ether into an anhydrous and oxygen-free pressure-resistant bottle, continuously adding 150g of benzene and 10g of diethyl zinc, sealing, shaking up, standing in a constant-temperature water bath kettle at 50 ℃ for 70min, separating the generated polymer from liquid, and drying the polymer in vacuum to obtain an external coating material;
2) dissolving 10g of the film-coated material in 70g of absolute ethyl alcohol to prepare a feed liquid;
3) and coating 30g of feed liquid on 20g of solid hydrochloric acid by adopting a spray drying method to prepare the film-coated solid acid.
The following experiments illustrate the beneficial effects of the present invention:
the performance of the coated solid acid prepared in 4 examples was evaluated and compared according to the experimental evaluation method for release performance, corrosion performance and corrosion performance proposed by "a coated acid for increasing effective working distance of acid fracturing" (patent publication No. CN 109913195A).
Under the same conditions: the residual rate of the coated solid acid provided by the invention is higher, which shows that the coated solid acid provided by the invention has better acid resistance and temperature resistance, can be suitable for carbonate reservoirs with higher temperature, and can simultaneously achieve the purposes that the coated solid acid is not released in a near-wellbore area and gradually releases H far away from a wellbore+The effect of (1); the coated solid acid has lower average corrosion speed, which indicates that the corrosion inhibition performance is better, and the corrosion to a shaft is also lower in the acid fracturing operation process, so that the construction risk of acid fracturing is reduced; the coated solid acid has higher average rock consumption quality, which shows that the coated solid acid has better corrosion performance and can release more H+。
Meanwhile, the flow conductivity of the coated solid acid provided by the embodiment is evaluated, and the specific method is as follows:
① a small amount of additive and water are added into 36 wt% hydrochloric acid to prepare 15 wt% HCl gelled acid and 20 wt% HCl gelled acid, and on the basis of 15 wt% HCl gelled acid, the coated solid acid provided in the examples is added according to the mass fraction of 5% to prepare a 15 wt% HCl gelled acid +5 wt% coated solid acid system, and the total of 5 acid systems, namely 15 wt% HCl gelled acid +5 wt% coated solid acid 1 (example 1), 15 wt% HCl gelled acid +5 wt% coated solid acid 2 (example 2), 15 wt% HCl gelled acid +5 wt% coated solid acid 3 (example 3), 15 wt% HCl gelled acid +5 wt% coated solid acid 4 (example 4) and 20 wt% HCl gelled acid, are respectively corresponding to system 1, system 2, system 3, system 4 and system 5;
② numbering the rock plate (length 15cm × width 10cm × height 2cm), photographing and laser scanning, and placing the rock sample into a core holder;
③ is connected with the core holder, the heating system of the holder is started, and the temperature is set to be 140 ℃;
④ pouring the standard saline water and acid liquor system into the corresponding liquid tank, starting the heating jacket of the liquid tank and setting the temperature to 140 ℃;
⑤ when the liquid storage tank and the rock plate groove are heated to the set temperature, the acid liquid stored in the liquid storage tank is driven to the rock plate groove to react with the rock plate, the acid injection displacement is 0.5L/min, the acid injection time is 40min, and the outlet acid liquid is recycled after being filtered;
⑥ cooling, washing, photographing the surface of the rock plate, and laser scanning;
⑦, loading the rock plate back to the rock core holder, connecting the rock core holder, and continuously testing the flow conductivity;
⑧ setting closing pressure of 10MPa, 20MPa, 30MPa, 40MPa, 50MPa, injecting standard saline solution from the liquid storage tank to the rock plate groove until the solution is stable, and recording differential pressure and flow under different closing pressures;
⑨ disassembling the core holder, cleaning all parts with clean water, and calculating the acid-etched fracture conductivity by the following formula:
in the formula: kfWf-conductivity of acid-etched fractures, D · cm;
q-acid liquor discharge capacity, L/min;
μ -acid viscosity, mPa · s;
l-length of simulated acid etching crack, cm;
h-height of simulated acid etching crack, cm;
△ P-Experimental pressure Difference, MPa.
The experimental results are as follows.
The experimental result further shows that the coated solid acid system has good retarding performance relative to pure gelled acid with the same effective acid concentration, is suitable for creating long seams in a reservoir, can effectively increase the flow conductivity of acid-etched fractures, and can be used for deep acid fracturing of a high-temperature deep carbonate reservoir.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs is composed of an internal solid acid and an external coating material, and is characterized in that the external coating material comprises 35-55% of water-soluble skeleton monomers, 25-35% of acid-resistant monomers, 10-15% of temperature-resistant monomers and 10-15% of strength monomers by mass.
2. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs according to claim 1, wherein: the water-soluble framework monomer is ethylene oxide.
3. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs according to claim 1, wherein: the acid-resistant monomer is one or more of n-butyl acrylate, glycidyl methacrylate and hydroxyethyl methacrylate.
4. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs according to claim 1, wherein: the temperature-resistant monomer is one or more of phthalimide, glutarimide and maleimide.
5. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs according to claim 1, wherein: the strength monomer is one or two of pentaerythritol triallyl ether and trimethylolpropane diallyl ether.
6. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs according to claim 1, wherein: the preparation steps of the external coating material are as follows:
6-1) adding 35-55% of water-soluble skeleton monomer, 25-35% of acid-resistant monomer, 10-15% of temperature-resistant monomer and 10-15% of strength monomer into an anhydrous and oxygen-free pressure-resistant bottle according to the mass ratio, and continuously adding a polymerization solvent and a catalyst;
6-2) sealing, shaking up, standing in a constant temperature water bath kettle at 45-60 ℃ for 60-80 min;
6-3) separating the generated polymer from the liquid, and drying the polymer in vacuum to obtain the external coating material.
7. The coated solid acid suitable for deep acid fracturing of carbonate reservoirs according to claim 1, wherein: the steps of external coating by the internal solid acid are as follows:
7-1) dissolving an external coating material in absolute ethyl alcohol, wherein the mass ratio of the external coating material to the absolute ethyl alcohol is 1:8-1:6, so as to prepare a feed liquid;
7-2) coating the feed liquid on the solid acid by adopting a spray drying device, wherein the mass ratio of the feed liquid to the solid acid is 1:1-2:1, so that the preparation of the film-coated solid acid is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010503203.8A CN111502629A (en) | 2020-06-05 | 2020-06-05 | Tectorial membrane solid acid suitable for carbonate rock reservoir degree of depth acid fracturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010503203.8A CN111502629A (en) | 2020-06-05 | 2020-06-05 | Tectorial membrane solid acid suitable for carbonate rock reservoir degree of depth acid fracturing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111502629A true CN111502629A (en) | 2020-08-07 |
Family
ID=71868676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010503203.8A Pending CN111502629A (en) | 2020-06-05 | 2020-06-05 | Tectorial membrane solid acid suitable for carbonate rock reservoir degree of depth acid fracturing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111502629A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115873586A (en) * | 2022-12-26 | 2023-03-31 | 西南石油大学 | Preparation method of high-temperature-resistant capsule acid and ultra-long-range acid fracturing process thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080026960A1 (en) * | 2006-07-25 | 2008-01-31 | Halliburton Energy Services, Inc. | Degradable particulates and associated methods |
| US20080119374A1 (en) * | 2006-11-21 | 2008-05-22 | Willberg Dean M | Polymeric Acid Precursor Compositions and Methods |
| CN101553552A (en) * | 2006-10-24 | 2009-10-07 | 普拉德研究及开发股份有限公司 | Degradable material assisted diversion |
| CN104707630A (en) * | 2015-02-12 | 2015-06-17 | 成都市瑞博恩能源科技有限责任公司 | Magnetic solid acid catalyst for biodiesel and method for preparing biodiesel |
| US20160145486A1 (en) * | 2013-07-31 | 2016-05-26 | Halliburton Energy Services, Inc. | Wellbore servicing compositions and methods of making and using same |
| US20170002623A1 (en) * | 2015-07-02 | 2017-01-05 | Schlumberger Technology Corporation | Well treatment |
| CN109913195A (en) * | 2019-04-25 | 2019-06-21 | 西南石油大学 | A kind of package acid improving acid fracturing EFFECTIVE RANGE |
| US20200157417A1 (en) * | 2017-07-13 | 2020-05-21 | Baker Hughes, A Ge Company, Llc | Delivery System for Oil-Soluble Well Treatment Agents and Methods of Using the Same |
-
2020
- 2020-06-05 CN CN202010503203.8A patent/CN111502629A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080026960A1 (en) * | 2006-07-25 | 2008-01-31 | Halliburton Energy Services, Inc. | Degradable particulates and associated methods |
| CN101553552A (en) * | 2006-10-24 | 2009-10-07 | 普拉德研究及开发股份有限公司 | Degradable material assisted diversion |
| US20080119374A1 (en) * | 2006-11-21 | 2008-05-22 | Willberg Dean M | Polymeric Acid Precursor Compositions and Methods |
| US20160145486A1 (en) * | 2013-07-31 | 2016-05-26 | Halliburton Energy Services, Inc. | Wellbore servicing compositions and methods of making and using same |
| CN104707630A (en) * | 2015-02-12 | 2015-06-17 | 成都市瑞博恩能源科技有限责任公司 | Magnetic solid acid catalyst for biodiesel and method for preparing biodiesel |
| US20170002623A1 (en) * | 2015-07-02 | 2017-01-05 | Schlumberger Technology Corporation | Well treatment |
| US20200157417A1 (en) * | 2017-07-13 | 2020-05-21 | Baker Hughes, A Ge Company, Llc | Delivery System for Oil-Soluble Well Treatment Agents and Methods of Using the Same |
| CN109913195A (en) * | 2019-04-25 | 2019-06-21 | 西南石油大学 | A kind of package acid improving acid fracturing EFFECTIVE RANGE |
Non-Patent Citations (4)
| Title |
|---|
| LUO ZF等: "A reservoir-damage-free encapsulated acid dually controlled by hydrogen ion concentration and temperature", 《RSC ADVANCES》 * |
| 安娜等: "碳酸盐岩储层深度酸压用固体颗粒酸的研制", 《石油钻探技术》 * |
| 张倩等: "中国海相碳酸盐岩储层酸化压裂改造技术现状及发展趋势", 《特种油气藏》 * |
| 李楠等: "智能控制固体酸SRA-1释放研究", 《石油与天然气化工》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115873586A (en) * | 2022-12-26 | 2023-03-31 | 西南石油大学 | Preparation method of high-temperature-resistant capsule acid and ultra-long-range acid fracturing process thereof |
| CN115873586B (en) * | 2022-12-26 | 2023-10-03 | 西南石油大学 | Preparation method of high-temperature-resistant capsule acid and ultra-long-range acid fracturing process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109337660B (en) | Low-pressure carbonate reservoir gas well temporary plugging workover fluid and preparation and application methods thereof | |
| CN105131913B (en) | Reverse wetting agent and container horizon protective agent composition and its application suitable for hyposmosis ultra-low permeability reservoir | |
| CA2870879A1 (en) | Enhanced oil recovery by in-situ steam generation | |
| US3827243A (en) | Method for recovering geothermal energy | |
| CN110386883B (en) | Preparation method of supercritical carbon dioxide thickening agent for exploitation of compact oil and gas reservoir | |
| CN110331972A (en) | Low pressure densification gas reservoir liquid CO2And CO2Foam system mixing fracturing technology | |
| CN104109519B (en) | Betaine polymer displacement composition and preparation method | |
| CN103429697A (en) | Process for producing mineral oil from underground formations | |
| CN111484578A (en) | Water-soluble AA-AM-NVP-NGD quadripolymer temporary plugging agent for fracturing and synthesis method thereof | |
| CN114920876A (en) | Temporary plugging agent and preparation method thereof | |
| US11987749B2 (en) | Polymers and nanoparticles for flooding | |
| CN111502629A (en) | Tectorial membrane solid acid suitable for carbonate rock reservoir degree of depth acid fracturing | |
| CN107974246B (en) | High-temperature-resistant cross-linked acid system, preparation method and application | |
| CN108587593A (en) | A kind of low temperature reservoir slippery water fracturing fluid | |
| CN113754838A (en) | Thickened oil activator and preparation method thereof | |
| CN107201220B (en) | A method of improving the viscosity of liquid carbon dioxide | |
| CN109439308B (en) | Weighted fracturing fluid of crosslinked glacial acetic acid and preparation method and application thereof | |
| CN106084142B (en) | Core-shell structure copolymer shape polymer and preparation method thereof suitable for oil field output water | |
| CN106010494B (en) | A kind of LOW PERMEABILITY RESERVOIR oil displacement surfactant and its preparation and product | |
| CN110105942B (en) | Wax remover and preparation method and application thereof | |
| CN102585797A (en) | Diverting acid for carrying out acidification and transformation on high-temperature oil and gas well with long well segment | |
| CN116003701B (en) | Fracturing fluid based on silicon dioxide nano-microemulsion and preparation method thereof | |
| CN116948079A (en) | Drag reducer for shale gas reservoir fracturing and preparation method thereof | |
| CN1273997A (en) | Method for removing deposited dirt from oil well with chemical agent | |
| CN109627378B (en) | Hydrophobic association complex and preparation method thereof, clean diverting acid for heterogeneous carbonate reservoir acid fracturing and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200807 |