CN116574494A - Blocking remover and preparation method thereof - Google Patents
Blocking remover and preparation method thereof Download PDFInfo
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- CN116574494A CN116574494A CN202310398405.4A CN202310398405A CN116574494A CN 116574494 A CN116574494 A CN 116574494A CN 202310398405 A CN202310398405 A CN 202310398405A CN 116574494 A CN116574494 A CN 116574494A
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 80
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 58
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 40
- -1 iron ion Chemical class 0.000 claims abstract description 31
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000007797 corrosion Effects 0.000 claims abstract description 26
- 238000005260 corrosion Methods 0.000 claims abstract description 26
- 239000011737 fluorine Substances 0.000 claims abstract description 26
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 26
- 239000003112 inhibitor Substances 0.000 claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000020477 pH reduction Effects 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 24
- 239000003381 stabilizer Substances 0.000 claims abstract description 24
- 239000000654 additive Substances 0.000 claims abstract description 21
- 230000000996 additive effect Effects 0.000 claims abstract description 21
- 150000001875 compounds Chemical class 0.000 claims abstract description 21
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 20
- 238000004090 dissolution Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 33
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 33
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 30
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- 238000000034 method Methods 0.000 claims description 12
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- 235000019253 formic acid Nutrition 0.000 claims description 11
- 239000002904 solvent Substances 0.000 claims description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 7
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- 229920000570 polyether Polymers 0.000 claims description 7
- 229920001451 polypropylene glycol Polymers 0.000 claims description 6
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 claims description 5
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 5
- 229920001529 polyepoxysuccinic acid Polymers 0.000 claims description 5
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 3
- 239000005642 Oleic acid Substances 0.000 claims description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002455 scale inhibitor Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000003079 shale oil Substances 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000012752 auxiliary agent Substances 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 239000000243 solution Substances 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
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- 238000010276 construction Methods 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 229920000056 polyoxyethylene ether Polymers 0.000 description 6
- 229940051841 polyoxyethylene ether Drugs 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000002981 blocking agent Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 5
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
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- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 3
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- 230000000979 retarding effect Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- ZMYKITJYWFYRFJ-UHFFFAOYSA-N 4-oxo-4-(2-phenylethylamino)butanoic acid Chemical compound OC(=O)CCC(=O)NCCC1=CC=CC=C1 ZMYKITJYWFYRFJ-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
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- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- 229940049964 oleate Drugs 0.000 description 2
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
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- 229940104869 fluorosilicate Drugs 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
Abstract
The invention discloses a blocking remover and a preparation method thereof, and belongs to the technical field of auxiliary agents for oil extraction in oil fields. The blocking remover comprises an organic release agent, retarded acid solution, fluorine-containing compound, corrosion inhibitor for acidification, iron ion stabilizer, cleanup additive, demulsifier, ethylene glycol monobutyl ether, ammonium chloride and antiscaling agent. The invention also provides a preparation method of the blocking remover, which comprises the following steps: and adding the fluorine-containing compound, the corrosion inhibitor for acidification, the iron ion stabilizer, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent into the retarded acid solution for dissolution, and then mixing with the organic release agent to obtain the blocking remover. The blocking remover provided by the invention realizes the dynamic temporary blocking acidification in the horizontal well section and achieves the purpose of uniform acid distribution in the horizontal section, thereby realizing the stable production of the shale oil horizontal well.
Description
Technical Field
The invention relates to the technical field of auxiliary agents for oil extraction in oil fields, in particular to a blocking remover and a preparation method thereof.
Background
The shale oil of the Changqing oilfield is mainly concentrated in the Longdong, a national demonstration area of the national shale oil development is built, the basin is as long as 30 hundred million tons of shale oil (compact oil) resources, wherein the Longdong area reaches 20 hundred million tons, and the resources are huge. Through initial production development of shale oil, the initial yield of a single well reaches 18.6t/d, a good development effect is obtained, and a medium-petroleum characteristic shale oil development mode is established.
Along with the development process of the horizontal well of the shale oil with the length of 7, the formation energy of the quasi-natural energy region is insufficient, the yield is decreased greatly, the water flooding effect of the water flooding development region of the non-same horizon is poor, and produced water is limited to the stable yield of the oil reservoir due to contradiction such as blockage removal and blockage caused by environmental change. The first year of the yield of the quasi-natural energy development area and the water injection development area is decreased greatly, which is 3 times of that of the oil reservoir with the length of 8 Western peak. Stable production of a long 7 shale oil horizontal well is the most critical development link of shale oil project department.
Because the horizontal section of the Longdong shale oil horizontal well is long (average over 2000 meters), repeated fracturing reformation of the horizontal well faces factors such as difficulty in entering the well of a downhole tool, high cost, long period and the like. The acid liquor is unevenly distributed in the horizontal section direction in the horizontal well due to the influence of the long horizontal section, and the problems that the plugging efficiency of the diversion diverter used in the acidification process is low, the acid resistance is poor, the diversion diverter is not dissolved thoroughly after transformation to pollute a reservoir and the like are solved, so that the acid liquor enters a large amount of a hypertonic zone or an oil layer with depleted pressure, the non-uniformity between layers or sections is further aggravated, and huge economic loss is caused while resources are wasted. The segmented acidification simply depends on tools to realize fine transformation operation, so that the problems of long period and high construction cost exist. The sectional acidification is only to divide the horizontal section into three sections with equal length, and is mainly realized by gradually lifting and acidifying a K344+ injector + K344 double-seal drilling tool, so that the failure rate of the borehole is high, the sectional pertinence is not strong, and the construction efficiency is low after the fracturing transformation is performed again.
Aiming at the contradiction and prominence between horizontal well sections, the acid liquor is unevenly distributed in the horizontal section direction in the acidification process, so that the acid liquor enters a large amount of a hypertonic zone or an oil layer with depleted pressure, and the heterogeneity between layers or sections is further aggravated. Dynamic temporary plugging acidizing is widely used in stimulation.
Along with the development time extension, the single well yield of the horizontal well is gradually decreased year by year, 1235 horizontal wells with single well yield lower than 2t in the long-day oilfield have, and the horizontal well with obvious blocking characteristics accounts for about 30% of the low-yield wells. The horizontal well blockage is one of important factors influencing the yield, and the proportion of the horizontal wells with the block blockage characteristics of water combination, hua Qing, ji Yuan and the like is found to be higher by statistics.
According to the characteristics of the shale oil length 7 reservoir and the production and development characteristic analysis, the formation capacity is decreased and the reservoir is blocked, so that the problem of efficient development of the shale oil horizontal well is limited. The method is combined with the implementation of 42 ports of earlier-stage long-term oil fields, the current effective rate is 94.8%, the daily oil increase of the well is 2.1t after the measure, and the measure effect is obvious compared with the earlier-stage improvement. But also has the following problems that (1) the low-pressure well (the pressure is kept below 75 percent of the level) is quickly decreased after being blocked in a segmented way, and the stable production difficulty is high; (2) the horizontal well has complex shaft, the acidification of the horizontal well takes about 15 days of the well period, and the cost is high; (3) the refinement degree of the segmented acidification technology also needs to be improved.
Disclosure of Invention
The invention aims to overcome the technical defects, provides a blocking remover and a preparation method thereof, and solves the technical problem of how to realize stable production of a shale oil horizontal well in the prior art.
In order to achieve the technical aim, the technical scheme of the invention provides a blocking remover which comprises an organic releasing agent, retarded acid liquor, fluorine-containing compounds, an acidification corrosion inhibitor, an iron ion stabilizer, a cleanup additive, a demulsifier, ethylene glycol monobutyl ether, ammonium chloride and an antiscaling agent.
Further, the retarded acid liquid is a mixed liquid of strong acid and weak acid.
Further, the strong acid is hydrochloric acid, and the weak acid is one or more of formic acid, acetic acid and citric acid.
Further, the blocking remover comprises, by mass, 8% -12% of an organic release agent, 25% -30% of a retarded acid solution, 2% -5% of a fluorine-containing compound, 0.5% -1.5% of an acidizing corrosion inhibitor, 0.5% -1% of an iron ion stabilizer, 0.5% -1% of a cleanup additive, 1% -1.5% of a demulsifier, 2% -4% of ethylene glycol monobutyl ether, 1% -2% of ammonium chloride and 0.5% -1.5% of an antiscaling agent.
10% of organic release agent, 26% of retarded acid solution, 4% of fluorine-containing compound, 1% of corrosion inhibitor for acidification, 0.5% of iron ion stabilizer, 1% of cleanup additive, 1% of demulsifier, 3% of ethylene glycol monobutyl ether, 2% of ammonium chloride and 1% of antiscaling agent.
Further, the retarded acid solution comprises 7% hydrochloric acid, 18% formic acid, 27% acetic acid and 8% citric acid according to mass percent.
Further, the organic release agent is a DES solvent; and/or the fluorine-containing compound is one or two of ammonium fluoride and ammonium bifluoride.
Further, the corrosion inhibitor for acidification is one or two of a BSA-602 corrosion inhibitor and an oleic acid imidazoline quaternary ammonium salt; and/or the iron ion stabilizer is one or more of hydroxyethylidene diphosphonic acid, EDTA and BSA-504 type iron ion stabilizer.
Further, the cleanup additive is one or more of EN288 (fluorine-containing polyether quaternary ammonium salt, methanol, alkyl polyoxyethylene ether and water), PEN-5 (methanol, alkyl polyoxyethylene ether and water) and super fo (dihydric alcohol, fluorine-containing amide compound and water).
Further, the demulsifier is one or more of polyethylene oxide (PEO) and polypropylene oxide (PPO) block polyether demulsifier and SP type (polyoxyethylene polyoxypropylene stearyl ether); and/or the scale inhibitor is one or more of HEDP-4Na, polyepoxysuccinic acid PESA and ATMP-Na4.
In addition, the invention also provides a preparation method of the blocking remover, which comprises the following steps: and adding the fluorine-containing compound, the corrosion inhibitor for acidification, the iron ion stabilizer, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent into retarded acid liquor for dissolution, and then mixing with the organic release agent to obtain the blocking remover.
Compared with the prior art, the invention has the beneficial effects that: the blocking remover provided by the invention realizes the dynamic temporary blocking acidification in the horizontal well section and achieves the purpose of uniform acid distribution in the horizontal section, thereby realizing the stable production of the shale oil horizontal well.
Drawings
FIG. 1 is a graph showing the results of analysis of acid injection and fluid loss sensitivity of a clustered dynamic temporary plugging acidizing plugging removal short fracture of a horizontal well of a hypertonic reservoir of a plugging removal agent according to example 1 of the present invention.
FIG. 2 is a graph showing the results of the analysis of the sensitivity of acid injection and fluid loss of a clustered dynamic temporary plugging and acid removal long-fracture injection in a horizontal well of a hypotonic reservoir according to the embodiment 1 of the invention.
Detailed Description
The specific embodiment provides a blocking remover which comprises an organic remover, retarded acid liquor, fluorine-containing compounds, an acidification corrosion inhibitor, an iron ion stabilizer, a cleanup additive, a demulsifier, ethylene glycol monobutyl ether, ammonium chloride and an antiscaling agent; the retarded acid liquid is a mixed liquid of strong acid and weak acid; the strong acid is hydrochloric acid, and the weak acid is one or more of formic acid, acetic acid and citric acid; the blocking remover comprises, by mass, 16% -24% of an organic release agent, 50% -60% of a retarded acid solution, 4% -10% of a fluorine-containing compound, 1% -3% of an acidizing corrosion inhibitor, 1% -2% of an iron ion stabilizer, 1% -2% of a cleanup additive, 2% -3% of a demulsifier, 4% -8% of ethylene glycol monobutyl ether, 2% -4% of ammonium chloride and 1% -3% of an antiscaling agent.
In certain embodiments, the retarded acid solution comprises 7% hydrochloric acid, 18% formic acid, 27% acetic acid and 8% citric acid by mass percent.
In this embodiment, the organic release agent is a DES solvent; the fluorine-containing compound is one or two of ammonium fluoride and ammonium bifluoride; the corrosion inhibitor for acidification is one or two of BSA-602 type corrosion inhibitor and oleic acid imidazoline quaternary ammonium salt; the iron ion stabilizer is one or more of hydroxyethylidene diphosphonic acid, EDTA and BSA-504 type iron ion stabilizer; the cleanup additive is one or more of EN288 (fluorine-containing polyether quaternary ammonium salt, methanol, alkyl polyoxyethylene ether and water), PEN-5 (methanol, alkyl polyoxyethylene ether and water), and super fo (dihydric alcohol, fluorine-containing amide compound and water); the demulsifier is one or more of polyethylene oxide (PEO) and polypropylene oxide block polyether demulsifier (PPO), SP type (polyoxyethylene polyoxypropylene stearyl alcohol ether); the scale inhibitor is one or more of HEDP-4Na, polyepoxysuccinic acid PESA and ATMP-Na4.
The DES solvent consists of two or more Hydrogen Bond Acceptors (HBA) and Hydrogen Bond Donors (HBD); the emission aid EN288 is purchased from the market and comprises fluorine-containing polyether quaternary ammonium salt, methanol, alkyl polyoxyethylene ether and water; the cleanup additive PEN-5 is purchased from the market and comprises methanol, alkyl polyoxyethylene ether and water; superfo is commercially available as a component comprising a glycol, a fluoroamide compound and water.
In addition, the specific embodiment also provides a preparation method of the blocking remover, which comprises the following steps: and adding the fluorine-containing compound, the corrosion inhibitor for acidification, the iron ion stabilizer, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent into retarded acid liquor for dissolution, and then mixing with the organic release agent to obtain the blocking remover.
Adding a certain amount of acid-resistant self-degrading temporary plugging agents into the plugging agent, along with the acid injection process, injecting a certain amount of acid-resistant self-degrading temporary plugging agents with specific specifications into a shaft, adding parameters such as no stop of a pump, no change of working fluid, no change of discharge capacity and the like in the middle of the acid-resistant self-degrading temporary plugging agents, promoting the prior plugging agents to preferentially enter a high-permeability fracture zone with minimum resistance to react, temporarily plugging a high-permeability layer under the double effects of the acid-resistant self-degrading temporary plugging agents and the acid-rock reaction, preventing the plugging agents from continuously entering a high-permeability duct, turning at the deep part of a reservoir, forcing the plugging agents to turn to a low-permeability layer or a plugging layer of a horizontal section, realizing uniform acid distribution and 'network' acidification of a fractured reservoir of a long horizontal well section, reducing damage to a fracture system of a well zone, cleaning, plugging and acidification, and achieving the purpose of high-efficiency transformation.
The acid liquor technology principle is that a retarded acid liquor system is formed by using strong acid (hydrochloric acid) and weak acid (organic acid), hydrochloric acid firstly reacts with reservoir minerals, when the effective concentration is reduced, the organic weak acid further ionizes H ions and participates in the reaction, the H ion reaction activity in the acid liquor system is prolonged, and the acid liquor penetration distance is increased. Compared with the conventional earth acid system, the system additive can carry out multistage ionization to keep the solution at a lower pH value, and has stronger complexing and adsorbing effects on various anions and cations.
The retarding mechanism is as follows:
the strong acid (hydrochloric acid) and the weak acid (organic acid) form a retarded acid solution system, the hydrochloric acid reacts with reservoir minerals first, and when the effective concentration is reduced, the organic weak acid is ionized further and participates in the reaction, so that the reaction activity of fluorine-containing compounds is prolonged, and the acid solution penetration mechanism is increased. In addition, the compound organic acid is easy to produce physical adsorption and chemical adsorption with clay minerals with large surface areas, and can also provide certain retarding effect.
Inhibiting the precipitation mechanism:
the acid solution contains a complex organic acid, which can "sequester" a corresponding amount of multivalent metal ions in solution at very low concentrations, much higher than the stoichiometric amount according to the sequestration mechanism, thereby keeping some of the metal ions that are prone to precipitate in solution. During sandstone acidizing, the reaction of HF with reservoir rock minerals will produce Ca 2+ 、A1 3+ 、Fe 3+ And polyvalent metal ions which are easy to generate sediment are generated, the generation of sediment seed crystals is inhibited and retarded by organic acid in the solution, and the metal ions are difficult to continue to grow and develop into sediment. In addition, the complex organic acid pair Ca 2+ 、Mg 2+ 、Na + 、K + The plasma cations have stronger adsorption capacity and can effectively prevent the ions from being mixed with F - 、SiF 6 2- And fluoride precipitates and fluorosilicate precipitates are formed, so that acid sludge formation is effectively reduced.
Erosion rates of different acid liquor systems on rock debris
| Acid liquor system | Acid liquor injection amount/ml | Time/h | Corrosion rate/% |
| Tu acid | 10 | 24 | 15.6 |
| Micellar acid | 10 | 24 | 18.4 |
| Temporary blocking earth acid | 10 | 24 | 14.2 |
| Retarding acid liquor | 10 | 24 | 25.8 |
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The blocking remover in the following examples is prepared by the following steps: adding a fluorine-containing compound, an acidizing corrosion inhibitor, an iron ion stabilizer, a cleanup additive, a demulsifier, ethylene glycol monobutyl ether, ammonium chloride and an antiscaling agent into retarded acid liquor for dissolution, and then mixing with an organic release agent to obtain the blocking remover; the BSA-504 type iron ion stabilizer was purchased from Beijing Stone Daaode technology Co.
Example 1
The embodiment provides a blocking remover, which comprises, by mass, 22% of an organic remover DES solvent, 7% of hydrochloric acid, 18% of formic acid, 27% of acetic acid and 8% of citric acid, 4% of fluorine-containing compound ammonium fluoride, 1% of a corrosion inhibitor BSA-602 for acidification, 1% of an iron ion stabilizer hydroxyethylidene diphosphonic acid, 2% of a cleanup additive EN288, 2% of demulsifier polyethylene oxide, 4% of ethylene glycol monobutyl ether, 3% of ammonium chloride and 1% of an antiscaling agent HEDP-4Na.
Example 2
The embodiment provides a blocking remover which comprises, by mass, 16% of DES solvent, 6% of hydrochloric acid, 16% of formic acid, 24% of acetic acid and 9% of citric acid, 10% of ammonium bifluoride, 2% of imidazoline quaternary ammonium oleate, 1.5% of EDTA, 1.5% of PEN-5, 2% of polyethylene oxide, 8% of ethylene glycol monobutyl ether, 2% of ammonium chloride and 2% of polyepoxysuccinic acid.
Example 3
The embodiment provides a blocking remover which comprises, by mass, 24% of DES solvent, 5% of hydrochloric acid, 16% of formic acid, 24% of acetic acid and 6% of citric acid, 5% of ammonium fluoride, 3% of BSA-602 type corrosion inhibitor, 2% of BSA-504, 1% of PEN-5, 3% of polypropylene oxide block polyether, 6% of ethylene glycol monobutyl ether, 2% of ammonium chloride and 3% of polyepoxysuccinic acid.
Example 4
The embodiment provides a blocking remover, which comprises 21% of an organic release agent DES solvent, 6% of hydrochloric acid, 16% of formic acid, 24% of acetic acid, 5% of citric acid, 5% of ammonium bifluoride, 2% of imidazoline quaternary ammonium oleate, 2% of EDTA, 1% of super fo, 3% of polyoxyethylene polyoxypropylene stearyl ether, 7% of ethylene glycol monobutyl ether, 4% of ammonium chloride and 2% of ATMP-Na4 according to mass percentage.
Comparative example 1
This comparative example differs from example 1 only in that: the corrosion inhibitor BSA-602 type corrosion inhibitor for acidification is not contained, and other raw materials and materials are the same as in example 1.
The preparation method comprises the following steps: according to the proportion of each component, the fluorine-containing compound, the iron ion stabilizer, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent are mixed and then are mixed with the organic release agent to obtain the blocking remover.
Comparative example 2
This comparative example differs from example 1 only in that: no retarded acid solution, i.e. no 7% hydrochloric acid, no 18% formic acid, no 27% acetic acid and no 8% citric acid.
The preparation method comprises the following steps: according to the proportion of each component, the fluorine-containing compound, the corrosion inhibitor for acidification, the iron ion stabilizer, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent are mixed, and then the mixture is mixed with the organic release agent to obtain the blocking remover.
Comparative example 3
This comparative example differs from example 1 only in that: and the stabilizer, namely the hydroxyethylidene diphosphonic acid, does not contain iron ions.
The preparation method comprises the following steps: and adding the fluorine-containing compound, the corrosion inhibitor for acidification, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent into the retarded acid solution for dissolution, and then mixing with the organic release agent to obtain the blocking remover.
And (3) testing: the glass bottle is filled with a certain amount of polymer, different blocking remover is injected, and after a certain period of time, the degradation condition of the polymer is observed, and the result is shown in the following table.
Degradation Effect of examples 1-4 and comparative examples 1-3
| Dosage/ml of blocking remover | Time/h | Degradation rate/% | |
| Comparative example 1 | 30 | 6 | 72.3 |
| Comparative example 2 | 30 | 6 | 56.2 |
| Comparative example 3 | 30 | 6 | 76.2 |
| Example 1 | 30 | 6 | 93.4 |
| Example 2 | 30 | 6 | 92.8 |
| Example 3 | 30 | 6 | 92.4 |
| Example 4 | 30 | 6 | 93.1 |
Correlation performance detection
Annotating blocking agent speed influencing factors
Considering engineering implementation, the main factors influencing the speed of the annotation plugging agent are as follows:
(1) a safe and reliable upper operating pressure limit;
(2) the size and structure of the pipe column;
(3) liquid friction size;
(4) reservoir thickness, permeability;
(5) formation fluid and injection fluid viscosity;
(6) formation pressure, fracture pressure, etc.;
(7) annotating the blocking device capability.
After the factors and problems are confirmed through oilfield data, calculation can be applied, and the speed of annotating the plugging agent can be determined by combining with the experience of the plugging agent removing construction site.
(2) Annotating blocking agent strength influencing factors
The factors influencing the strength of the annotated plugging agent are more, and mainly comprise the factors of porosity of a reservoir, reaction characteristics of the plugging agent and rock, soluble mineral components of the plugging agent, pollution range and degree of the reservoir and the like. In general, the more soluble mineral components in the reservoir, the faster the plugging agent reacts with the rock, the greater the range of contamination, and the greater the degree of contamination, the greater the volume of plugging agent required. In the process of removing the blocking of the drilling fluid, two important front edges with different properties can be identified when the blocking remover reacts in the stratum in a flowing way, and each front edge has the characteristic moving speed.
1) Flow front of blocking remover
The position of the interface between the injected acid and the original fluid in the pore is expressed, and the flow front and the front moving speed of the acid can be estimated by the acid injection speed and the acid injection time.
2) Reaction front of blocking remover
The reaction front of the blocking remover refers to the position with the largest concentration and mineral concentration change of the blocking remover, namely the position with the largest concentration gradient (or permeability gradient) change of the blocking remover at the reaction front of the blocking remover and the rock.
Determination of annotating plugging agent velocity
Based on the research of the influence factors of the annotation blocking agent speed, the research of the annotation blocking agent speed is developed by combining the reservoir and the damage characteristics of the target area, and the maximum acid injection speed can be determined according to the following formula.
When the method is used for concrete construction, the maximum acid injection speed can be obtained by substituting the reservoir parameters to be constructed and the damage characteristic parameters into the above method.
Optimal injection rates (unit: m 3/min.m.h) at different contamination levels (S) and fluidity coefficients (kh/. Mu.)
The optimal injection speed is determined by the epidermis coefficient and the fluidity coefficient, and is between 0.03m 3 /min.m.h-0.14m 3 /min.m.h。
In the conversion in the horizontal well, because the blocking remover is lost along the wall surface of the crack in the injection process, the influence of the construction displacement on the acid solution treatment crack range is larger, the sensitivity analysis is carried out on the treatment range along the crack direction in the acid injection process of the short-crack reservoir and the long-crack reservoir of the hypotonic reservoir, and under the condition of 90 square liquid entering amount, the blocking remover can be used for removing the blocking of all the crack wall surfaces when the construction displacement is optimized to be 0.4-1.6 square, and the method is particularly shown in figures 1 and 2.
Determination of annotating blocking agent intensity
The blocking remover is mainly used for removing blocking and eroding stratum pollutants, so as to achieve the purpose of recovering the seepage characteristics of the stratum. The dosage is mainly determined by the reaction characteristic of the blocking remover and the stratum and the blocking removal radius:
in the middle of-porosity, decimal;
C m％ -percent concentration of blocking remover solubles;
r d injury radius, m;
β h -acid dissolution force;
the relationship between the blocking remover strength and the blocking radius and erosion rate of example 1
Example 1 blocking remover with erosion rate of 0.06 to rock mass, blocking removal radius of 2.0m-3.0m, injection strength of 2.11m 3 /m-4.78m 3 /m。
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (10)
1. The blocking remover is characterized by comprising an organic releasing agent, retarded acid liquor, fluorine-containing compounds, an acidification corrosion inhibitor, an iron ion stabilizer, a cleanup additive, a demulsifier, ethylene glycol monobutyl ether, ammonium chloride and an antiscaling agent.
2. The unblocking agent according to claim 1, wherein the retarded acid solution is a mixture of a strong acid and a weak acid.
3. The blocking remover of claim 2, wherein the strong acid is hydrochloric acid and the weak acid is one or more of formic acid, acetic acid, and citric acid.
4. The blocking remover according to claim 1, characterized by comprising, by mass, 8% -12% of an organic release agent, 25% -30% of a retarded acid solution, 2% -5% of a fluorine-containing compound, 0.5% -1.5% of an acidizing corrosion inhibitor, 0.5% -1% of an iron ion stabilizer, 0.5% -1% of a cleanup additive, 1% -1.5% of a demulsifier, 2% -4% of ethylene glycol monobutyl ether, 1% -2% of ammonium chloride and 0.5% -1.5% of an antiscaling agent.
5. The blocking remover according to claim 4, wherein the retarded acid solution comprises, by mass, 7% hydrochloric acid, 18% formic acid, 27% acetic acid and 8% citric acid.
6. The deblocking agent of claim 1, wherein said organic deblocking agent is DES solvent; and/or the fluorine-containing compound is one or two of ammonium fluoride and ammonium bifluoride.
7. The blocking remover according to claim 1, wherein the acidifying corrosion inhibitor is one or both of a BSA-602 type corrosion inhibitor and an oleic acid imidazoline quaternary ammonium salt; and/or the iron ion stabilizer is one or more of hydroxyethylidene diphosphonic acid, EDTA and BSA-504 type iron ion stabilizer.
8. The deblocking agent of claim 1, wherein the demulsifier is one or more of polyethylene oxide, polypropylene oxide block polyether, and SP type.
9. The deblocking agent of claim 1, wherein the scale inhibitor is one or more of HEDP-4Na, polyepoxysuccinic acid, and ATMP-Na4.
10. The method for preparing a blocking remover according to any of claims 1-9, comprising the steps of: and adding the fluorine-containing compound, the corrosion inhibitor for acidification, the iron ion stabilizer, the cleanup additive, the demulsifier, the ethylene glycol monobutyl ether, the ammonium chloride and the antiscaling agent into the retarded acid solution for dissolution, and then mixing with the organic release agent to obtain the blocking remover.
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