CN111057534A - Emulsion acidification yield-increasing and injection-increasing agent and preparation and use methods thereof - Google Patents
Emulsion acidification yield-increasing and injection-increasing agent and preparation and use methods thereof Download PDFInfo
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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
- C09K8/60—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
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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
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- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
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Abstract
The invention discloses an emulsion acidizing, yield-increasing and injection-increasing agent and a preparation and use method thereof, wherein the emulsion acidizing, yield-increasing and injection-increasing agent comprises a main agent and an auxiliary agent, and the auxiliary agent comprises a well flushing fluid, a pad fluid, a post fluid and a displacement fluid; the displacement fluid and the flushing fluid have the same components; the main agent comprises a main agent cosolvent, an antiscaling agent, a chelating agent, an iron ion stabilizer, an emulsifier and a main agent mutual solvent; the well-flushing liquid comprises a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer; the pad fluid comprises an auxiliary agent cosolvent, an auxiliary agent mutual solvent, a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer; the post-solution comprises an auxiliary agent cosolvent, an auxiliary agent mutual solvent, a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer. The emulsion is automatically demulsified after the emulsion is acidified and the yield is increased and the injection increasing agent is completely hydrolyzed, and the demulsification is favorable for residual acid flowback at the later stage of acidification.
Description
Technical Field
The invention belongs to the technical field of oil/gas field sandstone formation acidification production increase/injection increase; in particular to an emulsion acidification yield-increasing and injection-increasing agent and a preparation and use method thereof.
Background
Acidification is an effective method for increasing the production of sandstone formation oil/gas wells and increasing the injection of water injection wells. One or more acid liquids are squeezed into a stratum through a well hole, and chemical reaction of acid and part of minerals in the stratum is utilized to erode communicated pores in a reservoir or rocks on the wall surface of a natural/hydraulic fracture and dissolve external plugs (including sediment plugs generated by reaction of leaked-in substances or filtrate with stratum water and rock minerals) leaked into or filtered from pores or fractures in the stratum (in the processes of drilling, well completion, well workover and oil extraction) so as to enlarge or dredge a stratum seepage passage, improve the stratum permeability and improve the stratum flow conductivity, thereby increasing the yield of an oil/gas well and increasing the injection of a water injection well.
According to the construction mode and purpose of acidification, the technological process can be divided into three main categories of acid washing, matrix acidification (also called pore acidification) and fracture acidification. Sandstone stratum acidification mainly refers to matrix acidification, and when not particularly stated, acidification construction is stratum matrix acidification operation. Matrix acidizing is a production increase measure for injecting acid liquid into pore spaces (intergranular spaces, holes or cracks) under the condition of the fracture pressure of stratum rocks, and utilizing the acid liquid to erode plugs in the near-wellbore area so as to restore the permeability of the stratum or utilizing the acid liquid to dissolve fine particles, cementate and the like in the pores so as to enlarge the pore spaces and improve the permeability of the stratum. The matrix acidification has small construction pressure and no crack, and the acid liquid and the blockage or fine particles in the pores have high reaction speed, so that the effective action distance is short, usually within 2.0-3.0 m, and the requirement of deep blockage removal or modification of the stratum cannot be met.
For sandstone strata, the common acidification means at home and abroad in various oil and gas fields is mainly salt
The earth acid [ (12-15)% HCl + (3-5)% HF + additive-conventional strong earth acid ] formed by compounding acid and hydrofluoric acid,
the conventional earth acid acidification is favored and valued by people all the time due to the advantages of simpler construction process and more outstanding effect, and is an acidification mode commonly adopted in various domestic oil and gas fields at present. Despite its advantages, the acidification of earth acids presents some problems, which are mainly reflected in:
(1) the acid liquor filtration loss is large, usually, the acid liquor can selectively enter a plurality of natural microcracks and gaps to form acid-etched holes, so that excessive filtration loss of the acid liquor is caused, and the acid liquor reaching the pores of the matrix is too small, so that the overall acidification effect is influenced;
(2) the acid rock reaction rate is high, and the acid rock reaction temperature is too high due to the fact that most of special oil/gas reservoirs are large in buried depth, so that the mass transfer speed of H & lt + & gt from the body acid liquid to the surface of the rock is greatly increased, the acid rock reaction rate is increased, the effective action distance of the acid liquid is reduced, and certain difficulties are caused in removing deep blockage of old well strata and deep transformation of new well strata;
(3) the secondary damage of the residual acid is large, the acid liquor corrodes the liquid preparation tank, the ground squeeze pipe string and the well entering squeeze pipe column in the on-site liquid preparation and squeeze processes, and Fe generated by corrosion2+And due to the cosolvent (NH) in conventional earth acids4+) The content is relatively low, and the residual acid is not completely discharged, finally, insoluble iron [ FeS, Fe (OH) is formed in the stratum3、FeCO3Etc. of]Silicon (Na)2SiF6、K2SiF6) Aluminum (Na)3AlF6、K3AlF6、AlF3) And calcium (CaF)2、CaSiF6、Ca3(AlF6)2；MgF2、MgSiF6、Mg3(AlF6)2) Precipitates block the stratum, and secondary damage to the stratum is caused;
(4) the corrosion of the equipment, the pipe column and the pipe string is large, and the liquid tank, the pumping equipment (such as a cement truck) and the ground pipe string and the well-entering pipe string are subjected to the chemical corrosion of acid liquid in the liquid preparation and squeezing processes. The larger the oil and gas reservoir burial depth is, the longer the construction time is, the more serious the corrosion is, and the more serious the corrosion is particularly when the high-temperature deep well is operated;
(5) there is a safety risk to the personnel in the field due to the corrosiveness of the acid solution and the high volatility of hydrochloric acid (HCl ≠ and of hydrofluoric acid (CaF)2And ↓) and great safety risk can be brought to the liquid preparation personnel and other field personnel if the operation is improper.
Disclosure of Invention
The invention aims to provide an emulsion acidification yield-increasing and injection-increasing agent and a preparation method and a using method thereof, so as to solve the technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
an emulsion acidification yield-increasing and injection-increasing agent comprises a main agent and an auxiliary agent, wherein the auxiliary agent comprises a well flushing fluid, a pad fluid, a post fluid and a displacement fluid; the well flushing fluid and the displacement fluid have the same components;
the main agent comprises 70-80% of water phase and 20-30% of oil phase by volume, and the main agent comprises a main agent cosolvent, an antiscaling agent, a chelating agent, an iron ion stabilizer, an emulsifier and a main agent mutual solvent; the well flushing fluid comprises 100% of a water phase by volume, and comprises a surfactant, a scale inhibitor, a chelating agent and an iron ion stabilizer; the pad fluid comprises 100% of water phase by volume, and the pad fluid comprises an auxiliary agent cosolvent, an auxiliary agent mutual solvent, a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer; the post fluid comprises 100% of water phase by volume, and the post fluid comprises an auxiliary agent cosolvent, an auxiliary agent mutual solvent, a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer.
Furthermore, in the main agent, the concentration of the main agent cosolvent is 35.52-53.28 g/L, the concentration of the scale inhibitor is 32-48 mg/L, the concentration of the chelating agent is 2.4-3.6 g/L, the concentration of the iron ion stabilizer is 1.6-2.4 g/L, the concentration of the emulsifier is 16-24 g/L, and the concentration of the main agent mutual solvent is 20-30 ml/L;
in the well washing liquid, the concentration of the surfactant is 1.2-1.8 g/L, the concentration of the scale inhibitor is 20-30 mg/L, the concentration of the chelating agent is 1.2-1.8 g/L, and the concentration of the iron ion stabilizer is 1.2-1.8 g/L;
in the pre-solution, the concentration of an auxiliary agent cosolvent is 40-60 g/L, the concentration of an auxiliary agent mutual solvent is 20-30 ml/L, the concentration of a surfactant is 1.6-2.4 g/L, the concentration of an antiscaling agent is 32-48 mg/L, the concentration of a chelating agent is 2.4-3.6 g/L, and the concentration of an iron ion stabilizer is 1.6-2.4 g/L;
in the post-solution, the concentration of an auxiliary agent cosolvent is 36-54 g/L, the concentration of an auxiliary agent mutual solvent is 20-30 ml/L, the concentration of a surfactant is 1.2-1.8 g/L, the concentration of an antiscaling agent is 20-30 mg/L, the concentration of a chelating agent is 1.2-1.8 g/L, and the concentration of an iron ion stabilizer is 1.2-1.8 g/L.
Further, the water for the water phase comprises low-concentration Ca2+、Mg2+、Na+、K+Of fresh water of (2), wherein Ca2+、Mg2+、Na+、K+The concentration of C is more than or equal to 0mg/LCa2++CMg2+≤50mg/L，0mg/L≤CNa++CK+Less than or equal to 200 mg/L; the oil phase is benzene sulfonyl chloride.
Further, the main agent cosolvent is ammonium fluoride, the main agent mutual solvent is a compound of ethanol and propiolic alcohol in a volume ratio of 4: 1, the auxiliary agent cosolvent is ammonium chloride, the auxiliary agent mutual solvent is ethylene glycol monobutyl ether, the scale inhibitor is an aqueous solution with a pH value of 7.0 obtained by compounding ammonium hydroxyethylidene diphosphonate and ammonium aminotrimethylene phosphonate in a mass ratio of 1: 1 based on the mass of organic phosphoric acid and neutralizing the ammonium solution with ammonia water, the chelating agent is an aqueous solution of ammonium diacetyl tetraacetate with a pH value of 7.0 obtained by neutralizing the tetraacetate with ammonia water, the iron ion stabilizer is an aqueous solution of ammonium erythorbate with a pH value of 7.0 obtained by neutralizing the erythorbic acid with ammonia water, the surfactant is an aqueous solution with a pH value of 7.0 obtained by compounding ammonium 12 alkyl polyoxyethylene (7) ether sulfate and 12 alkyl polyoxyethylene (20) ether in a mass ratio of 1: 1.5, and the emulsifier is the same as the surfactant.
A preparation method of an emulsion acidification yield-increasing and injection-increasing agent comprises the following steps:
preparing a surfactant, adding one part of ammonium 12 alkyl alcohol polyoxyethylene (7) ether sulfate with the mass concentration of 80% into three parts of 12 alkyl alcohol polyoxyethylene (20) ether with the mass concentration of 40%, and stirring and mixing uniformly;
preparing an antiscaling agent, namely uniformly stirring and mixing 40% of hydroxyethylidene diphosphonic acid and 40% of aminotrimethylene phosphonic acid by mass concentration, neutralizing the mixed solution with ammonia water until the pH value is 7.0, and calculating the total milligrams of organic phosphoric acid contained in each liter of neutral solution;
preparing a chelating agent, adding the diacetyl amide tetraacetic acid into 8-10% ammonia water for reaction neutralization, adjusting the pH of the neutralized water solution to 7.0 by using 25-28% concentrated ammonia water, and calculating the gram number of the diacetyl amide tetraacetic acid contained in each liter of neutral solution;
preparing an iron ion stabilizer, adding isoascorbic acid into ammonia water with the concentration of 8% -10% for neutralization, adjusting the pH of the neutralized aqueous solution to 7.0 by using concentrated ammonia water with the concentration of 25% -28%, and calculating the gram number of the isoascorbic acid contained in each liter of neutral solution;
the auxiliary agent cosolvent is ammonium chloride, and the auxiliary agent mutual solvent is ethylene glycol monobutyl ether.
Further, the preparation method of the well-flushing fluid comprises the following steps:
adding part of fresh water into a preparation container, adding an iron ion stabilizer aqueous solution containing 1.2-1.8 g of erythorbic acid into the preparation container, and uniformly stirring; under the condition of stirring, sequentially adding a chelating agent aqueous solution containing 1.2-1.8 g of diacetyl amide tetraacetic acid, an antiscaling agent aqueous solution containing 20-30 mg of organic phosphonic acid and a surfactant aqueous solution containing 1.2-1.8 g of surfactant into water, finally adding the rest fresh water into a preparation container to a position of 1 liter, and uniformly stirring.
Further, the preparation method of the pad fluid comprises the following steps:
adding part of fresh water into a preparation container, adding an iron ion stabilizer aqueous solution containing 1.6-2.4 g of erythorbic acid into the preparation container, and uniformly stirring; under the condition of stirring, sequentially adding a chelating agent aqueous solution containing 2.4-3.6 g of diacetyl amide tetraacetic acid, an antiscaling agent aqueous solution containing 32-48 mg of organic phosphonic acid, an aqueous solution containing 1.6-2.4 g of surfactant and 20-30 ml of ethylene glycol monobutyl ether auxiliary agent mutual solvent into a preparation container, and uniformly stirring; and finally, adding 40-60 g of ammonium chloride auxiliary agent cosolvent into the preparation container, adding the rest fresh water into the preparation container to a position of 1 liter, and uniformly stirring.
Further, the preparation method of the postliquid comprises the following steps:
adding part of fresh water into a preparation container, adding an iron ion stabilizer aqueous solution containing 1.2-1.8 g of erythorbic acid into the preparation container, and uniformly stirring; under the condition of stirring, sequentially adding a chelating agent aqueous solution containing 1.2-1.8 g of diacetyl amide tetraacetic acid, an antiscaling agent aqueous solution containing 20-30 mg of organic phosphonic acid, an aqueous solution containing 1.2-1.8 g of surfactant and 20-30 ml of ethylene glycol monobutyl ether auxiliary agent mutual solvent into a preparation container, and uniformly stirring; and finally, adding 36-54 g of ammonium chloride auxiliary agent cosolvent into the preparation container, adding fresh water to a constant volume of 1 liter, and uniformly stirring.
Further, the preparation method of the main agent comprises the following steps:
① preparing softened fresh water, adding part of water for the water phase into a preparation container, sequentially adding an iron ion stabilizer aqueous solution containing 1.6-2.4 g of erythorbic acid, a chelating agent aqueous solution containing 2.4-3.6 g of diacetyl amide tetraacetic acid and an antiscaling agent aqueous solution containing 32-48 mg of organic phosphonic acid into the preparation container under the condition of stirring, adding the water for the water phase into the preparation container, fixing the volume to 550-700 ml, and uniformly stirring and mixing;
② preparing a main agent mutual solvent, adding 4-6 ml of propiolic alcohol into 16-24 ml of ethanol under the stirring condition according to the volume ratio of ethanol to propiolic alcohol of 4: 1, and uniformly mixing;
③ preparing the main agent, adding 200-300 ml of oil phase benzene sulfonyl chloride into a preparation container, then adding 20-30 ml of main agent mutual solvent, stirring uniformly, adding 16-24 g of emulsifier aqueous solution under stirring, fully stirring to emulsify and mix with the oil phase, then adding 550-700 ml of softened fresh water into the preparation container, stirring uniformly, adding 35.52-53.28 g of ammonium fluoride main agent cosolvent, adding water phase water to a constant volume of 1 liter, and finally stirring for 16-24 min under 3000-4000 r/min.
A method for using an emulsion acidification yield-increasing and injection-increasing agent comprises the following steps:
washing the well by using a well washing liquid by using a forward washing method or a backwashing method, and washing solid sediments, sewage and sump oil in the shaft out of the shaft;
after the well washing liquid completely washes the shaft, firstly squeezing the pre-positioned liquid with the volume of 0.8-1.0 time of the volume of the pre-positioned liquid into the squeezing pipe string, closing the casing pipe gate, and squeezing the pre-positioned liquid into the stratum through the squeezing pipe string;
after the pre-liquid is extruded, sequentially extruding the main agent and the post-liquid;
and (3) extruding flushing fluid with the volume 1.1-1.3 times of the volume of the squeeze pipe string into the shaft through a positive injection method, and closing the well after the postpositive fluid is pushed into the stratum.
The invention has the following beneficial effects:
1. the main agent of the emulsion acidizing production-increasing and injection-increasing agent is a potential acid system, can be used in the technical measures of acidizing production-increasing and injection-increasing of sandstone strata (the stratum temperature is more than or equal to 50 ℃), and is hydrolyzed at the stratum temperature (C)6H5-SO2Cl+H2O→C6H5-SO3H+HCl；H++F-→ HF) can generate novel earth acid with effect equivalent to (7.90-11.85)% HCl + (1.92-2.88)% HF [ (26.92-40.38)% (HCl + C)6H5-SO3H)+(1.92～2.88)％HF]；
2. The emulsion is automatically demulsified after the emulsion is acidified and the yield is increased and the injection increasing agent is completely hydrolyzed, so that residual acid in the later stage of acidification can be returned and discharged;
3. the propiolic alcohol in the formula of the emulsion acidification yield-increasing and injection-increasing agent is not only a mutual solvent but also a corrosion inhibitor, and plays a role in inhibiting corrosion and protecting equipment such as a shaft, an emptying pipe string and the like in the residual acid flowback process at the later stage of acidification;
4. the preparation method of the emulsion acidification yield-increasing and injection-increasing agent is simple, is beneficial to large-scale industrial application, and has strong practical value.
5. The use method of the emulsion acidification yield-increasing and injection-increasing agent is easy to operate, simple and easy to operate, and can effectively protect the personal safety of liquid preparation personnel and other field personnel.
Detailed Description
The present invention will be described in detail below with reference to examples. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
Example 1:
preparing a well flushing fluid:
step 1) preparation of a surfactant: according to the mass ratio of 12 alkyl alcohol polyoxyethylene (7) ammonium sulfate to 12 alkyl alcohol polyoxyethylene (20) ether of 1: 1.5, under the condition of stirring, 10Kg of 12 alkyl alcohol polyoxyethylene (7) ammonium sulfate with the mass concentration of 80% is added into 30Kg of 12 alkyl alcohol polyoxyethylene (20) ether with the mass concentration of 40%, and the mixture is fully stirred and uniformly mixed to prepare mixed surfactant aqueous solution (containing 20Kg of surfactant) with the mass concentration of 50%.
Step 2) preparation of the scale inhibitor: 130g of 40% by mass hydroxyethylidene diphosphonic acid and 130g of 40% by mass aminotrimethylene diphosphonic acid (or 130g of 40% by mass aminotrimethylene phosphonic acid) were added to 130g of 40% by mass hydroxyethylidene diphosphonic acid under stirring in a mass ratio of 1: 1, and the mixture was stirred thoroughly and mixed uniformly to prepare a 40% by mass mixed aqueous solution of organic phosphonic acid (containing 104g of organic phosphonic acid) having a mass of 260 g. Then, under the stirring condition, adding ammonia water (25-28%) into the prepared mixed organic phosphonic acid aqueous solution to fully react and neutralize, measuring the pH value of the aqueous solution after reaction and neutralization to be 7.0, recording the volume of the neutralized aqueous solution and the mass (104g) of the mixed organic phosphonic acid, and calculating the total gram (g/L) of the organic phosphonic acid contained in each liter of neutral aqueous solution.
Step 3) preparation of a chelating agent: adding fresh water of about 8 liters into concentrated ammonia water of about 4 liters (25 percent to 28 percent), uniformly stirring to reduce the concentration of the fresh water to about one third of the original concentration, slowly adding 7.2Kg of diacetyl amide tetraacetic acid into the concentrated ammonia water under the stirring condition for full reaction and neutralization, and then adjusting the pH value of the water solution after the reaction and the neutralization to 7.0 by using the concentrated ammonia water. The volume of the aqueous solution at PH 7.0 and the mass of the diacetyl amide tetraacetic acid (7.2Kg) were recorded and the kilograms of diacetyl amide tetraacetic acid per liter of neutral aqueous solution (Kg/L) were calculated.
Step 4) preparing an iron ion stabilizer: adding fresh water of about 6 liters into concentrated ammonia water of about 3 liters (25 percent to 28 percent), uniformly stirring to reduce the concentration to about one third of the original concentration, slowly adding 5.6Kg of isoascorbic acid into the mixture under the stirring condition for full reaction and neutralization, and then adjusting the pH value of the aqueous solution after the reaction and the neutralization to 7.0 by using the concentrated ammonia water. The volume of the aqueous solution at PH 7.0 and the mass of erythorbic acid (5.6Kg) were recorded, and the number of kilograms of erythorbic acid contained per liter of the neutral aqueous solution (Kg/L) was calculated.
Step 5) preparing a well-flushing liquid: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.2Kg of iron ion stabilizer aqueous solution containing erythorbic acid prepared in the step 4), and stirring uniformly. Under the condition of stirring, sequentially adding 1.2Kg of aqueous solution of chelating agent containing acetamide tetraacetic acid prepared in the step 3), 20g of aqueous solution of antiscaling agent containing organic phosphonic acid prepared in the step 2) and 2.4Kg of aqueous solution of surfactant (containing 1.2Kg of surfactant) prepared in the step 1) into the reaction kettle, finally adding the rest fresh water to a place of 1000 liters into the enamel reaction kettle, uniformly stirring, and measuring the pH value to be within the range of 7.0 +/-0.2, thus obtaining the finished product of the well-flushing liquid of 1000 liters.
Description of the drawings: the surfactant/emulsifier, the antiscaling agent, the chelating agent and the iron ion stabilizer required by the pre-positioned fluid, the post-positioned fluid and the main agent to be prepared are respectively completed in the step 1), the step 2), the step 3) and the step 4) of preparing the well-flushing fluid. Therefore, the subsequent steps of preparing the preflush, the postfluid and the base are not present (omitted), but they are used directly as they have been prepared previously.
Preparing a pad fluid: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.6Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well flushing fluid, and uniformly stirring. Under the condition of stirring, 2.4Kg of chelating agent aqueous solution containing the diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, 32g of antiscaling agent aqueous solution containing the organic phosphonic acid in the step 2) of preparing the well-flushing liquid, 3.2Kg of surfactant aqueous solution (containing 1.6Kg of surfactant) prepared in the step 1) of preparing the well-flushing liquid and 20 liters of ethylene glycol monobutyl ether auxiliary mutual solvent are sequentially added into a reaction kettle and stirred uniformly. And finally, adding 40Kg of ammonium chloride auxiliary agent cosolvent and the rest fresh water into the reaction kettle, fixing the volume to 1000 liters, uniformly stirring, and measuring the pH value to be within the range of 6.8 +/-0.2 to obtain a 1000 liter front liquid finished product.
Preparing a postposition solution: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.2Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well flushing fluid, and uniformly stirring. Under the condition of stirring, sequentially adding 1.2Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, 20g of antiscaling agent aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid, 2.4Kg of surfactant aqueous solution (containing 1.2Kg of surfactant) and 20 liters of ethylene glycol monobutyl ether auxiliary mutual solvent in the step 1) of preparing the well-flushing liquid into a reaction kettle, and uniformly stirring. And finally, adding 36Kg of ammonium chloride auxiliary agent cosolvent and the rest fresh water into the reaction kettle, metering the volume to 1000 liters, uniformly stirring, and measuring the pH value to be within the range of 6.8 +/-0.2 to obtain a 1000 liter postposition liquid finished product.
Preparing a main agent of the emulsion acidification yield-increasing and injection-increasing agent:
step 1) preparing softened fresh water: under the condition of stirring, 1.6Kg of iron ion stabilizer aqueous solution containing isoascorbic acid in the step 4) of preparing the well-flushing liquid, 2.4Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, and 32g of scale inhibitor aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid are sequentially added into 600 liters of fresh water. And finally, adding the rest fresh water into the preparation container until the volume is 700 liters, fully stirring and mixing, and fully chelating/complexing cations in the fresh water to form 700 liters of softened fresh water.
Step 2) preparing a main agent mutual solvent: according to the volume ratio of ethanol to propiolic alcohol of 4: 1, 4 liters of propiolic alcohol is added into 16 liters of ethanol under the stirring condition for fully mixing to prepare a composite mutual solvent with the volume of 20 liters.
And 3) adding 200 liters of oil-phase benzene sulfonyl chloride into a 1000 liter enamel reaction kettle, then adding 20 liters of the main agent mutual solvent prepared in the step 2), and uniformly stirring. Under the condition of stirring, 32Kg of aqueous solution (containing 16Kg of surface activity) of the surfactant prepared in the step 1) of preparing the well-flushing fluid is slowly added into the oil phase, and the mixture is fully stirred to be emulsified and mixed with the oil phase. Then, under the stirring condition, slowly adding 700 liters of softened fresh water prepared in the step 1) into an enamel reaction kettle, fully stirring and mixing, then adding 35.52Kg of main agent cosolvent ammonium fluoride and the balance fresh water under the stirring condition, and fixing the volume to 1000 liters. And finally, stirring for 16-24 min under the stirring condition of 3000r/min to form stable emulsion, and determining the pH value of the emulsion to be within 7.0 +/-0.2 to obtain a finished product of the 1000L emulsion acidification yield-increase injection-increasing agent.
The fresh water used in example 1 was oilfield well zone injection water, and the fresh water used in examples 2 and 3 below was oilfield well zone injection water. The oilfield well zone injection water chemistry is shown in table 3 below.
TABLE 3 chemical composition of oilfield well injection water
Example 2:
preparing a well flushing fluid:
step 1) preparation of a surfactant: according to the mass ratio of 12 alkyl alcohol polyoxyethylene (7) ammonium sulfate to 12 alkyl alcohol polyoxyethylene (20) ether being 1: 1.5, under the condition of stirring, 12.5Kg of 12 alkyl alcohol polyoxyethylene (7) ammonium sulfate with the mass concentration of 80% is added into 37.5Kg of 12 alkyl alcohol polyoxyethylene (20) ether with the mass concentration of 40%, and the mixture is fully stirred and uniformly mixed to prepare 50Kg of mixed surfactant aqueous solution (containing 25Kg of surfactant) with the mass concentration of 50%.
Step 2) preparation of the scale inhibitor: according to the mass ratio of hydroxyethylidene diphosphonic acid to amino trimethylene phosphonic acid being 1: 1, under the condition of stirring, 162.5g of 40% by mass hydroxyethylidene diphosphonic acid is added into 162.5g of 40% by mass aminotrimethylene phosphonic acid (or 162.5g of 40% by mass aminotrimethylene phosphonic acid is added into 162.5g of 40% by mass hydroxyethylidene diphosphonic acid), and the mixture is fully stirred and uniformly mixed to prepare 325g of 40% by mass mixed organic phosphonic acid aqueous solution (containing 130g of organic phosphonic acid). Then, under the stirring condition, adding ammonia water (25-28%) into the prepared mixed organic phosphonic acid aqueous solution to fully react and neutralize, measuring the pH value of the aqueous solution after reaction and neutralization to be 7.0, recording the volume of the neutralized aqueous solution and the mass (130g) of the mixed organic phosphonic acid, and calculating the total gram (g/L) of the organic phosphonic acid contained in each liter of neutral aqueous solution.
Step 3) preparation of a chelating agent: adding about 9 liters of fresh water into about 4.5 liters of concentrated ammonia water (25-28 percent), uniformly stirring to reduce the concentration to about one third of the original concentration, slowly adding 9Kg of diacetyl amide tetraacetic acid into the concentrated ammonia water under the stirring condition for full reaction and neutralization, and then adjusting the pH value of the aqueous solution after the reaction and the neutralization to 7.0 by using the concentrated ammonia water. The volume of the aqueous solution at PH 7.0 and the mass of the diacetyl amide tetraacetic acid (9Kg) were recorded and the kilograms of diacetyl amide tetraacetic acid per liter of neutral aqueous solution (Kg/L) were calculated.
Step 4) preparing an iron ion stabilizer: adding fresh water of about 7 liters into concentrated ammonia water of about 3.5 liters (25 percent to 28 percent), uniformly stirring to reduce the concentration of the fresh water to about one third of the original concentration, slowly adding 7Kg of isoascorbic acid into the mixture under the stirring condition for full reaction and neutralization, and then adjusting the pH value of the aqueous solution after the reaction and the neutralization to 7.0 by using the concentrated ammonia water. The volume of the aqueous solution at PH 7.0 and the mass of erythorbic acid (7Kg) were recorded, and the number of kilograms of erythorbic acid per liter of the neutral aqueous solution (Kg/L) was calculated.
Step 5) preparing a well-flushing liquid: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.5Kg of iron ion stabilizer aqueous solution containing erythorbic acid prepared in the step 4), and uniformly stirring. Under the condition of stirring, sequentially adding 1.5Kg of the chelating agent aqueous solution containing the diacetyl amide tetraacetic acid prepared in the step 3), 25g of the scale inhibitor aqueous solution containing the organic phosphonic acid prepared in the step 2) and 3Kg of the surfactant aqueous solution (containing 1.5Kg of the surfactant) prepared in the step 1) into the reaction kettle, finally adding the rest fresh water to a place of 1000 liters into the enamel reaction kettle, uniformly stirring, and measuring the pH value to be within the range of 7.0 +/-0.2 to obtain the finished product of the well-flushing liquid of 1000 liters.
Description of the drawings: the surfactant/emulsifier, the antiscaling agent, the chelating agent and the iron ion stabilizer required by the pre-positioned fluid, the post-positioned fluid and the main agent to be prepared are respectively completed in the step 1), the step 2), the step 3) and the step 4) of preparing the well-flushing fluid. Therefore, the subsequent steps of preparing the preflush, the postfluid and the base are not present (omitted), but they are used directly as they have been prepared previously.
Preparing a pad fluid: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 2Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well flushing fluid, and uniformly stirring. Under the condition of stirring, sequentially adding 3Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, 40g of scale inhibitor aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid, 4Kg of surfactant aqueous solution (containing 2Kg of surfactant) prepared in the step 1) of preparing the well-flushing liquid and 25 liters of ethylene glycol monobutyl ether auxiliary mutual solvent into a reaction kettle, and uniformly stirring. And finally, adding 50Kg of ammonium chloride auxiliary agent cosolvent and the rest fresh water into the reaction kettle, metering the volume to 1000 liters, uniformly stirring, and measuring the pH value to be within the range of 6.8 +/-0.2 to obtain a 1000 liter front liquid finished product.
Preparing a postposition solution: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.5Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well flushing fluid, and uniformly stirring. Under the condition of stirring, sequentially adding 1.5Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, 25g of antiscaling agent aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid, 3Kg of surfactant aqueous solution (containing 1.5Kg of surfactant) prepared in the step 1) of preparing the well-flushing liquid and 25 liters of ethylene glycol monobutyl ether auxiliary mutual solvent into a reaction kettle, and uniformly stirring. And finally, adding 45Kg of ammonium chloride auxiliary agent cosolvent and the rest fresh water into the reaction kettle, fixing the volume to 1000 liters, uniformly stirring, and measuring the pH value to be within the range of 6.8 +/-0.2 to obtain a 1000 liter postposition liquid finished product.
Preparing a main agent of the emulsion acidification yield-increasing and injection-increasing agent:
step 1) preparing softened fresh water: under the condition of stirring, 2Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well-flushing liquid, 3Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, and 40g of antiscaling agent aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid are sequentially added into 525 liters of fresh water, and finally, the rest fresh water is added into a preparation container to be fixed to 625 liters, and the mixture is fully stirred and mixed to fully chelate/complex cations in the fresh water to form 625 liters of softened fresh water.
Step 2) preparing a main agent mutual solvent: according to the volume ratio of ethanol to propiolic alcohol of 4: 1, under the condition of stirring, 5 liters of propiolic alcohol is added into 20 liters of ethanol for fully mixing to prepare a composite mutual solvent with the volume of 25 liters.
And 3) adding 250 liters of oil-phase benzene sulfonyl chloride into a 1000 liter enamel reaction kettle, then adding 25 liters of mutual solvent prepared in the step 2), and uniformly stirring. Under the condition of stirring, slowly adding 40Kg of surfactant aqueous solution (containing 20Kg of surfactant) prepared in the step 1) of preparing the well-flushing fluid into the well-flushing fluid, and fully stirring the well-flushing fluid and the oil phase to emulsify and mix the well-flushing fluid and the oil phase. Then, under the stirring condition, 625 liters of softened fresh water prepared in the step 1) is slowly added into the enamel reaction kettle, fully stirred and mixed, and then 44.4Kg of main agent cosolvent ammonium fluoride and the balance fresh water are added under the stirring condition, and the constant volume is set to 1000 liters. And finally, stirring for 16-24 min under the stirring condition of 3500r/min to form stable emulsion, and measuring the pH value of the emulsion to be within 7.0 +/-0.2 to obtain a finished product of the emulsion acidification yield-increase and injection-increase agent of 1000 liters.
Example 3:
preparing a well flushing fluid:
step 1) preparation of a surfactant: according to the mass ratio of 12 alkyl alcohol polyoxyethylene (7) ammonium sulfate to 12 alkyl alcohol polyoxyethylene (20) ether being 1: 1.5, under the condition of stirring, 15Kg of 12 alkyl alcohol polyoxyethylene (7) ammonium sulfate with the mass concentration of 80% is added into 45Kg of 12 alkyl alcohol polyoxyethylene (20) ether with the mass concentration of 40%, and the mixture is fully stirred and uniformly mixed to prepare mixed surfactant aqueous solution (containing 30Kg of surfactant) with the mass concentration of 50% and 60 Kg.
Step 2) preparation of the scale inhibitor: according to the mass ratio of hydroxyethylidene diphosphonic acid to amino trimethylene phosphonic acid being 1: 1, 195g of hydroxyethylidene diphosphonic acid with the mass concentration of 40 percent is added into 195g of amino trimethylene phosphonic acid with the mass concentration of 40 percent under the stirring condition (or 195g of amino trimethylene phosphonic acid with the mass concentration of 40 percent is added into 195g of hydroxy ethylidene diphosphonic acid with the mass concentration of 40 percent), and the mixture is fully stirred and uniformly mixed to prepare mixed organic phosphonic acid aqueous solution (containing 156g of organic phosphonic acid) with the mass concentration of 390g and the concentration of 40 percent. Then, under the stirring condition, adding ammonia water (25-28%) into the prepared mixed organic phosphonic acid aqueous solution to fully react and neutralize, measuring the pH value of the aqueous solution after reaction and neutralization to be 7.0, recording the volume of the neutralized aqueous solution and the mass (156g) of the mixed organic phosphonic acid, and calculating the total gram (g/L) of the organic phosphonic acid contained in each liter of neutral aqueous solution.
Step 3) preparation of a chelating agent: adding fresh water of about 10 liters into concentrated ammonia water of about 5 liters (25 percent to 28 percent), uniformly stirring to reduce the concentration of the fresh water to about one third of the original concentration, slowly adding 10.8Kg of diacetyl amide tetraacetic acid into the concentrated ammonia water under the stirring condition for full reaction and neutralization, and then adjusting the pH value of the water solution after the reaction and the neutralization to 7.0 by using the concentrated ammonia water. The volume of the aqueous solution at PH 7.0 and the mass of the diacetyl amide tetraacetic acid (10.8Kg) were recorded and the kilograms of diacetyl amide tetraacetic acid per liter of neutral aqueous solution (Kg/L) were calculated.
Step 4) preparing an iron ion stabilizer: adding fresh water of about 8 liters into concentrated ammonia water of about 4 liters (25 percent to 28 percent), uniformly stirring to reduce the concentration of the fresh water to about one third of the original concentration, slowly adding isoascorbic acid of 8.4Kg into the concentrated ammonia water under the stirring condition for full reaction and neutralization, and then adjusting the pH value of the aqueous solution after the reaction and the neutralization to 7.0 by using the concentrated ammonia water. The volume of the aqueous solution at PH 7.0 and the mass of erythorbic acid (8.4Kg) were recorded, and the number of kilograms of erythorbic acid contained per liter of the neutral aqueous solution (Kg/L) was calculated.
Step 5) preparing a well-flushing liquid: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.8Kg of iron ion stabilizer aqueous solution containing erythorbic acid prepared in the step 4), and uniformly stirring. Under the condition of stirring, sequentially adding 1.8Kg of chelating agent aqueous solution containing the diacetyl amide tetraacetic acid prepared in the step 3), 30g of scale inhibitor aqueous solution containing the organic phosphonic acid prepared in the step 2) and 3.6Kg of surfactant aqueous solution (containing 1.8Kg of surfactant) prepared in the step 1) into the reaction kettle, finally adding the rest fresh water to a place of 1000 liters into the enamel reaction kettle, uniformly stirring, and measuring the pH value to be within the range of 7.0 +/-0.2 to obtain a finished product of the flushing liquid of 1000 liters.
Description of the drawings: the surfactant/emulsifier, the antiscaling agent, the chelating agent and the iron ion stabilizer required by the pre-positioned fluid, the post-positioned fluid and the main agent to be prepared are respectively completed in the step 1), the step 2), the step 3) and the step 4) of preparing the well-flushing fluid. Therefore, the subsequent steps of preparing the preflush, the postfluid and the base are not present (omitted), but they are used directly as they have been prepared previously.
Preparing a pad fluid: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 2.4Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well flushing fluid, and uniformly stirring. Under the condition of stirring, adding 3.6Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, an antiscaling agent aqueous solution containing 48g of organic phosphonic acid in the step 2) of preparing the well-flushing liquid, 4.8Kg of surfactant aqueous solution (containing 2.4Kg of surfactant) prepared in the step 1) of preparing the well-flushing liquid and 30 liters of ethylene glycol monobutyl ether auxiliary mutual solvent into a reaction kettle in sequence, and uniformly stirring. And finally, adding 60Kg of ammonium chloride auxiliary agent cosolvent and the rest fresh water into the reaction kettle, fixing the volume to 1000 liters, uniformly stirring, and measuring the pH value to be within the range of 6.8 +/-0.2 to obtain a 1000 liter front liquid finished product.
Preparing a postposition solution: adding 800 liters of fresh water into a 1000 liter enamel reaction kettle, then adding 1.8Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well flushing fluid, and uniformly stirring. Under the condition of stirring, sequentially adding 1.8Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, 30g of antiscaling agent aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid, 3.6Kg of surfactant aqueous solution (containing 1.8Kg of surfactant) prepared in the step 1) of preparing the well-flushing liquid and 30 liters of ethylene glycol monobutyl ether auxiliary mutual solvent into a reaction kettle, and uniformly stirring. And finally, adding 54Kg of ammonium chloride auxiliary agent cosolvent and the rest fresh water into the reaction kettle, fixing the volume to 1000 liters, uniformly stirring, and measuring the pH value to be within the range of 6.8 +/-0.2 to obtain a 1000 liter postposition liquid finished product.
Preparing a main agent of the emulsion acidification yield-increasing and injection-increasing agent:
step 1) preparing softened fresh water: under the condition of stirring, 2.4Kg of iron ion stabilizer aqueous solution containing erythorbic acid in the step 4) of preparing the well-flushing liquid, 3.6Kg of chelating agent aqueous solution containing diacetyl amide tetraacetic acid in the step 3) of preparing the well-flushing liquid, and 48g of antiscaling agent aqueous solution containing organic phosphonic acid in the step 2) of preparing the well-flushing liquid are sequentially added into 450 liters of fresh water, finally, the rest fresh water is added into a preparation container to reach the constant volume of 550 liters, and the mixture is fully stirred and mixed to fully chelate/complex cations in the fresh water to form 550 liters of softened fresh water.
Step 2) preparing a main agent mutual solvent: according to the volume ratio of ethanol to propiolic alcohol of 4: 1, under the condition of stirring, 6 liters of propiolic alcohol is added into 24 liters of ethanol for fully mixing to prepare a composite mutual solvent with the volume of 30 liters.
And 3) adding 300 liters of oil-phase benzene sulfonyl chloride into a 1000 liter enamel reaction kettle, then adding 30 liters of mutual solvent prepared in the step 2), and uniformly stirring. Under the condition of stirring, 48Kg of surfactant aqueous solution (containing 24Kg of surfactant) prepared in the step 1) of preparing the well-flushing fluid is slowly added into the well-flushing fluid, and the well-flushing fluid is fully stirred to be emulsified and mixed with the oil phase. Then, under the stirring condition, 550 liters of softened fresh water prepared in the step 1) is slowly added into an enamel reaction kettle, fully stirred and mixed, and then 53.28Kg of main agent cosolvent ammonium fluoride and the balance fresh water are added under the stirring condition, and the constant volume is set to 1000 liters. And finally, stirring for 16-24 min under the stirring condition of 4000r/min to form stable emulsion, and determining the pH value of the emulsion to be within 7.0 +/-0.2 to obtain a finished product of the 1000L emulsion acidification yield-increase injection-increasing agent.
Indoor evaluation of emulsion acidification yield increase and injection increasing agent:
an emulsion acidifying agent for increasing yield and injection can be used in the technical measures of acidifying and increasing yield and injection of sandstone formations (the formation temperature is more than or equal to 50 ℃), and is a potential acid agent.
1. The viscosity of the agent is 6.3-9.3 mPa.S at a shear rate of 100r/min at room temperature, and the viscosity of the agent is 1.8-2.7 mPa.S after hydrolysis.
2. Formation rock loss test:
the effect of the dissolution test after complete hydrolysis of 1L of the agent at a constant temperature of 50 ℃ is shown in Table 4 below.
TABLE 4.1L Effect of the dissolution test after complete hydrolysis of the latent acid emulsion
From the experimental results: under the constant temperature condition of 50 ℃, 3.42-5.14 g of Y10 formation sandstone is dissolved out after 1L of the agent is completely hydrolyzed, and the dissolution rate is 3.42-5.14%.
3. Sandstone core displacement test:
selecting a wood H41 well Y10 stratum core, processing the core according to SY/T5336-1996 standard, and determining the ratio of the pad fluid permeability before and after acidification: at the constant temperature of 50 ℃, after saturating the core by using Y10 stratum produced water, measuring the permeability Kq of the core by using the positive displacement of the pad fluid, injecting the main agent (the concentration is the lower limit concentration min or the upper limit concentration max)2.0PV in the reverse direction, standing for 6 hours at the constant temperature of 50 ℃, and finally measuring the permeability K of the core by using the positive displacement of the pad fluidq /Calculating Kq //KqThe ratio of (a) to (b). The water chemistry of the Y10 formation produced water is shown in table 5, and the results of the core displacement test are shown in table 6.
TABLE 5 water chemistry of Y10 formation produced Water
TABLE 6 front flooding core test results (test temperature 50 ℃ C.)
From the experimental results: under the constant temperature condition of 50 ℃, the front liquid is used for displacing the rock core to measure the permeability, and the permeability is improved by 38-57%.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. An emulsion acidification yield-increasing and injection-increasing agent is characterized by comprising a main agent and an auxiliary agent, wherein the auxiliary agent comprises a well flushing fluid, a pad fluid, a post fluid and a displacement fluid; the well flushing fluid and the displacement fluid have the same components;
the main agent comprises 70-80% of water phase and 20-30% of oil phase by volume, and the main agent comprises a main agent cosolvent, an antiscaling agent, a chelating agent, an iron ion stabilizer, an emulsifier and a main agent mutual solvent; the well flushing fluid comprises 100% of a water phase by volume, and comprises a surfactant, a scale inhibitor, a chelating agent and an iron ion stabilizer; the pad fluid comprises 100% of water phase by volume, and the pad fluid comprises an auxiliary agent cosolvent, an auxiliary agent mutual solvent, a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer; the post fluid comprises 100% of water phase by volume, and the post fluid comprises an auxiliary agent cosolvent, an auxiliary agent mutual solvent, a surfactant, an antiscaling agent, a chelating agent and an iron ion stabilizer.
2. The emulsion acidification yield and injection increasing agent as claimed in claim 1,
in the main agent, the concentration of the main agent cosolvent is 35.52-53.28 g/L, the concentration of the scale inhibitor is 32-48 mg/L, the concentration of the chelating agent is 2.4-3.6 g/L, the concentration of the iron ion stabilizer is 1.6-2.4 g/L, the concentration of the emulsifier is 16-24 g/L, and the concentration of the main agent mutual solvent is 20-30 ml/L;
in the well washing liquid, the concentration of the surfactant is 1.2-1.8 g/L, the concentration of the scale inhibitor is 20-30 mg/L, the concentration of the chelating agent is 1.2-1.8 g/L, and the concentration of the iron ion stabilizer is 1.2-1.8 g/L;
in the pre-solution, the concentration of an auxiliary agent cosolvent is 40-60 g/L, the concentration of an auxiliary agent mutual solvent is 20-30 ml/L, the concentration of a surfactant is 1.6-2.4 g/L, the concentration of an antiscaling agent is 32-48 mg/L, the concentration of a chelating agent is 2.4-3.6 g/L, and the concentration of an iron ion stabilizer is 1.6-2.4 g/L;
in the post-solution, the concentration of an auxiliary agent cosolvent is 36-54 g/L, the concentration of an auxiliary agent mutual solvent is 20-30 ml/L, the concentration of a surfactant is 1.2-1.8 g/L, the concentration of an antiscaling agent is 20-30 mg/L, the concentration of a chelating agent is 1.2-1.8 g/L, and the concentration of an iron ion stabilizer is 1.2-1.8 g/L.
3. The emulsion acidification stimulation and injection agent as claimed in claim 1, wherein the water phase comprises low concentration Ca2+、Mg2+、Na+、K+Of fresh water of (2), wherein Ca2+、Mg2+、Na+、K+The concentration of C is more than or equal to 0mg/LCa2++CMg2+≤50mg/L，0mg/L≤CNa++CK+Less than or equal to 200 mg/L; the oil phase is benzene sulfonyl chloride.
4. The emulsion acidification yield-increasing and injection-increasing agent according to claim 1, wherein the main solvent is ammonium fluoride, the main solvent is a mixture of ethanol and propiolic alcohol in a volume ratio of 4: 1, the auxiliary solvent is ammonium chloride, the auxiliary solvent is ethylene glycol monobutyl ether, the scale inhibitor is an aqueous solution with a pH value of 7.0 obtained by compounding ammonium hydroxyethylidene diphosphonate and ammonium aminotrimethylene phosphonate in a mass ratio of 1: 1 based on the mass of organic phosphoric acid, the chelating agent is an aqueous solution of ammonium diacetyl tetraacetate with a pH value of 7.0 obtained by neutralizing the diacetyl tetraacetate with aqueous ammonia, the iron ion stabilizer is an aqueous solution of isoascorbic acid with a pH value of 7.0 obtained by neutralizing the isoascorbic acid with aqueous ammonia, the surfactant is an aqueous solution with a pH value of 7.0 obtained by compounding ammonium 12 alkylpolyoxyethylene (7) ether sulfate and 12 alkylpolyoxyethylene (20) ether in a mass ratio of 1: 1.5, the emulsifier is the same as the surfactant component.
5. A method for preparing the emulsion acidification stimulation and injection agent of claim 1, which comprises the following steps:
preparing a surfactant, adding one part of ammonium 12 alkyl alcohol polyoxyethylene (7) ether sulfate with the mass concentration of 80% into three parts of 12 alkyl alcohol polyoxyethylene (20) ether with the mass concentration of 40%, and stirring and mixing uniformly;
preparing an antiscaling agent, namely uniformly stirring and mixing 40% of hydroxyethylidene diphosphonic acid and 40% of aminotrimethylene phosphonic acid by mass concentration, neutralizing the mixed solution with ammonia water until the pH value is 7.0, and calculating the total milligrams of organic phosphoric acid contained in each liter of neutral solution;
preparing a chelating agent, adding the diacetyl amide tetraacetic acid into 8-10% ammonia water for reaction neutralization, adjusting the pH of the neutralized water solution to 7.0 by using 25-28% concentrated ammonia water, and calculating the gram number of the diacetyl amide tetraacetic acid contained in each liter of neutral solution;
preparing an iron ion stabilizer, adding isoascorbic acid into ammonia water with the concentration of 8% -10% for neutralization, adjusting the pH of the neutralized aqueous solution to 7.0 by using concentrated ammonia water with the concentration of 25% -28%, and calculating the gram number of the isoascorbic acid contained in each liter of neutral solution;
the auxiliary agent cosolvent is ammonium chloride, and the auxiliary agent mutual solvent is ethylene glycol monobutyl ether.
6. The method of claim 5, wherein the well-flushing fluid is prepared by:
adding part of fresh water into a preparation container, adding an iron ion stabilizer aqueous solution containing 1.2-1.8 g of erythorbic acid into the preparation container, and uniformly stirring; under the condition of stirring, sequentially adding a chelating agent aqueous solution containing 1.2-1.8 g of diacetyl amide tetraacetic acid, an antiscaling agent aqueous solution containing 20-30 mg of organic phosphonic acid and a surfactant aqueous solution containing 1.2-1.8 g of surfactant into water, finally adding the rest fresh water into a preparation container to a position of 1 liter, and uniformly stirring.
7. The method of claim 5, wherein the pad fluid is prepared by:
adding part of fresh water into a preparation container, adding an iron ion stabilizer aqueous solution containing 1.6-2.4 g of erythorbic acid into the preparation container, and uniformly stirring; under the condition of stirring, sequentially adding a chelating agent aqueous solution containing 2.4-3.6 g of diacetyl amide tetraacetic acid, an antiscaling agent aqueous solution containing 32-48 mg of organic phosphonic acid, an aqueous solution containing 1.6-2.4 g of surfactant and 20-30 ml of ethylene glycol monobutyl ether auxiliary agent mutual solvent into a preparation container, and uniformly stirring; and finally, adding 40-60 g of ammonium chloride auxiliary agent cosolvent into the preparation container, adding the rest fresh water into the preparation container to a position of 1 liter, and uniformly stirring.
8. The method according to claim 5, wherein the post-liquid is prepared by:
adding part of fresh water into a preparation container, adding an iron ion stabilizer aqueous solution containing 1.2-1.8 g of erythorbic acid into the preparation container, and uniformly stirring; under the condition of stirring, sequentially adding a chelating agent aqueous solution containing 1.2-1.8 g of diacetyl amide tetraacetic acid, an antiscaling agent aqueous solution containing 20-30 mg of organic phosphonic acid, an aqueous solution containing 1.2-1.8 g of surfactant and 20-30 ml of ethylene glycol monobutyl ether auxiliary agent mutual solvent into a preparation container, and uniformly stirring; and finally, adding 36-54 g of ammonium chloride auxiliary agent cosolvent into the preparation container, adding fresh water to a constant volume of 1 liter, and uniformly stirring.
9. The method according to claim 5, wherein the main agent is prepared by the following method:
① preparing softened fresh water, adding part of water for the water phase into a preparation container, sequentially adding an iron ion stabilizer aqueous solution containing 1.6-2.4 g of erythorbic acid, a chelating agent aqueous solution containing 2.4-3.6 g of diacetyl amide tetraacetic acid and an antiscaling agent aqueous solution containing 32-48 mg of organic phosphonic acid into the preparation container under the condition of stirring, adding the water for the water phase into the preparation container, fixing the volume to 550-700 ml, and uniformly stirring and mixing;
② preparing a main agent mutual solvent, adding 4-6 ml of propiolic alcohol into 16-24 ml of ethanol under the stirring condition according to the volume ratio of ethanol to propiolic alcohol of 4: 1, and uniformly mixing;
③ preparing the main agent, adding 200-300 ml of oil phase benzene sulfonyl chloride into a preparation container, then adding 20-30 ml of main agent mutual solvent, stirring uniformly, adding 16-24 g of emulsifier aqueous solution under stirring, fully stirring to emulsify and mix with the oil phase, then adding 550-700 ml of softened fresh water into the preparation container, stirring uniformly, adding 35.52-53.28 g of ammonium fluoride main agent cosolvent, adding water phase water to a constant volume of 1 liter, and finally stirring for 16-24 min under 3000-4000 r/min.
10. A method of using the emulsion acidizing stimulation and injection agent of claim 1, which comprises:
s1, washing the well by using a well washing liquid by using a forward washing method or a backwashing method, and washing solid sediments, sewage and dirty oil in the shaft out of the shaft;
s2, after the shaft is thoroughly washed by the well washing liquid, squeezing the pre-positioned liquid with the volume 0.8-1.0 time of that of the squeezing pipe string into the squeezing pipe string, closing the casing pipe gate, and squeezing the pre-positioned liquid into the stratum through the squeezing pipe string;
s3, sequentially extruding and injecting the main agent and the post liquid after the pre liquid is extruded and injected;
and S4, extruding the flushing fluid with the volume 1.1-1.3 times of the volume of the squeeze pipe string into the shaft through a positive injection method, and closing the well after the post fluid is pushed into the stratum.
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| WO2022217033A1 (en) * | 2021-04-09 | 2022-10-13 | Championx Usa Inc. | Crude oil production using a combination of emulsion viscosity reducer and scale inhibitor |
| WO2022236044A1 (en) * | 2021-05-07 | 2022-11-10 | Saudi Arabian Oil Company | A retarded acid system based on sulfonyl chloride and methods thereof |
| US11788397B2 (en) | 2021-05-07 | 2023-10-17 | Saudi Arabian Oil Company | Retarded acid system based on sulfonyl chloride and methods thereof |
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