CN117801800A - Environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries - Google Patents
Environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 79
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- 239000003381 stabilizer Substances 0.000 claims abstract description 32
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 16
- 239000004927 clay Substances 0.000 claims abstract description 15
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical group [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 23
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- -1 iron ion Chemical class 0.000 claims description 17
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 15
- 235000019270 ammonium chloride Nutrition 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 13
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- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical class [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 3
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Abstract
The invention belongs to the technical field of fracturing fluids for low permeability oil reservoirs and petroleum exploitation, and particularly discloses an environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries. The self-generated acid fracturing fluid comprises a component A and a component B, wherein the component A comprises water, a drag reducer, a clay stabilizer and a cleanup additive; the component B comprises water, an acid-generating main agent a, an acid-generating main agent B and an iron ion stabilizer. The invention also provides a preparation method of the autogenous acid fracturing fluid. The self-generated acid fracturing fluid prepared by the invention is not acidic at the low temperature of less than 30 ℃, does not need to add a corrosion inhibitor, can combine fracturing with inhibition and injury relief, and has the advantages of long acting time, long corrosion distance, cost saving and environment-friendly components.
Description
Technical Field
The invention belongs to the technical field of fracturing fluids for low permeability oil reservoirs and petroleum exploitation, and particularly relates to an environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries.
Background
In the exploitation of tight reservoir oil and gas wells, maintaining the smoothness of the oil well is the core of maintaining high productivity. However, in the exploitation process, the reservoir is damaged due to the processes of drilling, well cementation, fracturing and acidizing, and the like, so that the production capacity of the oil well is reduced. Reservoir injuries mainly include water lock injuries, water sensitivity injuries and physical blockages, wherein the reasons for the physical blockages can be divided into the following categories: (1) The injected fluid contacts with the stratum to generate plugs, such as corrosion of steel, harmful inorganic ions generated by bacterial reproduction, bacterial thalli, metabolites and the like; (2) Unreasonable development, such as production in hypotonic reservoirs using large pressure differentials, resulting in migration of particulates in the formation, increasing fluid movement resistance; (3) The incompatibility of the injection fluid and the formation fluid causes scale precipitation to clog.
The conventional acidification and plugging removal method mainly comprises the steps of acidizing after fracturing is finished, and then etching rock or stratum plugs after acid liquid is injected into the stratum, so that the process is complex, the time consumption is long, and the cost is high. For the type of contamination of an oilfield development well, it is desirable to select a harmless liquid that meets the following requirements: (1) The safety of injection equipment and a pipe column is ensured due to effective corrosion prevention; (2) The acid liquor has stability so as to achieve the function of deep blocking removal; (3) And the method can effectively stabilize the iron ions and reduce the damage of the iron ions to the reservoir. The conventional acid has the risks of corrosion of a tubular column in the construction process of retarded acid, thickened acid, autogenous acid, foamed acid and emulsified acid, so that the autogenous acid which does not show acidity in the injection process is applied to various reservoirs as harmless liquid, and has more benefits.
CN201911104022.1 proposes a thickened autogenous acid system for acidizing fracturing stimulation of hydrocarbon reservoirs, comprising a component a and a component B, wherein the component a comprises a fluxing agent, a primary acid generator a and water; the component B comprises an acid-generating main agent B, a corrosion inhibitor, a cleanup additive, an iron ion stabilizer and water. The thickening self-acid generating system is used for retarded acidification of a carbonate reservoir, and the acid generating concentration is 18-20%. However, the system is a thickening system, is not suitable for compounding slick water, and the retarding rate is not disclosed.
CN201710352667.1 proposes a low-viscosity mixed fracturing fluid, its application and oil-gas reservoir reforming method, which realizes the integration of fracturing and acidification of carbonate rock, the viscosity is 30-60mpa·s, the drag reduction rate is 70%, the corrosion rate is 1% -20%, but the system contains a strong acid system of HCl and HF, and a corrosion inhibitor needs to be added, and is incompatible with slickwater, guar gum and the like.
CN202010485355.X proposes a self-acid-generating cross-linking fracturing fluid comprising a thickening agent, a cross-linking agent, an acid generator, an activator and water, which is applied to retarded acidification of high-temperature carbonate rock, the use temperature is 130-150 ℃, and the corrosion is carried out<10g/(m 2 H), acid rock reaction rate<1*10 -6 mol/(cm 2 S), but the system is also a thickening system, and a corrosion inhibitor is required to be added, and is not compatible with slick water, guar gum and the like.
CN202110618353.8 proposes a fracturing pre-self-acid generating system and its breaking method, which consists of paraformaldehyde, ammonium chloride and auxiliary agent, and is stirred at low speed under normal temperature to form a thickened self-acid generating system, and substitution reaction occurs at formation temperature to generate HCl. The formaldehyde solution as the main acid generator has high toxicity and low acid generating temperature, and is not suitable for large-scale hydraulic fracturing.
CN202010819815.8 proposes a self-generating acid and a pre-fluid system for fracture acidizing of high temperature carbonate rock, wherein the self-generating acid in the pre-fluid system comprises methyl formate, glycerol, methanol, formic acid and water. The pre-liquid system is suitable for the retarded acidification of high temperature carbonate rock. The mixed fracturing fluid is below 90 ℃ and does not generate acid; acid is generated at the temperature of 90-120 ℃ by 2.4 percent, but a cation thickening system is adopted, and the acid is not compatible with slick water.
Disclosure of Invention
In order to solve and inhibit the problem of reservoir damage caused in the process of reforming an oil and gas reservoir and promote imbibition, the invention provides the environment-friendly autogenous acid fracturing fluid for relieving and inhibiting the damage and the preparation method thereof, which are not acidic in the ground environment, integrate fracturing and damage relieving during construction, slowly generate acid in the fracturing process, have simple preparation method and few construction procedures, and can effectively relieve the damage of solid phase particles and inhibit scale.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B,
the component A comprises water, a drag reducer, a clay stabilizer and a cleanup additive;
the component B comprises water, an acid-generating main agent a, an acid-generating main agent B and an iron ion stabilizer.
Further, in the component A, the mass percentage of each component in the component A is as follows: 0.07-0.1wt% of drag reducer, 0.2-0.5wt% of clay stabilizer, 0.5-0.8wt% of cleanup additive and the balance of water;
in the component B, the mass percentages of the components in the component B are as follows: 5-20wt% of acid generation main agent a, 7.5-10wt% of acid generation main agent b, 1-2wt% of iron ion stabilizer and the balance of water;
the volume ratio of the A component to the B component is 1:2 to 7:2, wherein 2:1 is preferred.
Further, the acid-generating main agent a is at least one of ethyl formate, ethyl acetate and ethyl lactate.
Further, the acid-generating main agent b is ammonium chloride and/or ammonium fluoride. The acid-generating main agent b can promote the hydrolysis and release process of the acid-generating main agent a, and meanwhile, the generated weak acid and weak alkali salt is a good buffer system, so that double hydrolysis can be performed, more uniform release of acid liquor is promoted, and the performance of the self-generated acid fracturing fluid is improved.
Further, the drag reducer is polyacrylamide or a copolymer of acrylamide.
Further, the clay stabilizer is at least one of organic quaternary ammonium salt, potassium chloride, ammonium chloride and choline chloride.
Further, the cleanup additive is an anionic surfactant, preferably sodium dodecyl sulfate and/or dodecyl betaine.
Further, the iron ion stabilizer is at least one of disodium ethylenediamine tetraacetate, citric acid and EDTA sodium salt.
The invention also provides a preparation method of the environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries, which comprises the following steps:
(1) Mixing the component A for standby;
(2) Mixing the component B for standby;
(3) And uniformly mixing the component A and the component B, and stirring to obtain the finished product.
Further, the stirring speed in the step (3) is not less than 100 revolutions per minute.
Further, the stirring speed in the step (3) is 100-300 rpm.
Compared with the prior art, the invention has the beneficial effects that:
the environment-friendly self-acid fracturing fluid comprises self-acid and slick water fracturing fluid, and the self-acid does not generate acid under the ground normal temperature condition, so that the fracturing fluid does not generate acid or has low acid generation speed, the problem of rapid deactivation of acid liquor at high temperature can be avoided, and corrosion of pipes and equipment can be prevented.
The environment-friendly self-generated acid fracturing fluid is prepared from at least one of ethyl formate, ethyl acetate and ethyl lactate serving as an acid-generating main agent a, and esters which are environment-friendly, and ammonium chloride and/or ammonium fluoride serving as an acid-generating main agent b, wherein hydrogen ions can be slowly and uniformly hydrolyzed, and the environment-friendly self-generated acid fracturing fluid is compounded with slick water fracturing fluid at normal temperature, and is added with an iron ion stabilizer, a drag reducer and a cleanup additive, and is subjected to blockage or scale inhibition caused in the corrosion exploitation process of hydrochloric acid or hydrofluoric acid generated by hydrolysis of ethyl formate and ammonium chloride or ammonium fluoride.
The environment-friendly self-acid fracturing fluid disclosed by the invention is not acidic at a low temperature of less than 30 ℃, does not need to be added with a corrosion inhibitor, can combine fracturing with inhibition and damage relief, can carry sand to form a crack by using the slickwater fracturing fluid in the fracturing process, can increase the diversion capacity of a reservoir, can slowly generate acid in the fracturing process, avoids the subsequent acidolysis blocking removal effect, inhibits and erodes solid phase blocking generated in the fracturing process, increases the permeability of the reservoir, improves the seepage and absorption of the reservoir, does not add aldehyde substances, and has the advantages of long acting time, long erosion distance, cost saving and environment-friendly components.
Drawings
FIG. 1 shows the permeability change before and after plugging removal of a core after treatment with the acid fracturing fluid prepared in example 6 of the present invention.
Detailed Description
The present invention will be described with reference to specific examples, so that the technical solution of the present invention can be understood and grasped more easily, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available.
Example 1
An environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B, wherein:
100ml of A component: 0.07g polyacrylamide (the drag reducer CNI1#, molecular weight 800 ten thousand of the oil field chemical agent technology Co., ltd., beijing), 0.5g choline chloride (clay stabilizer), 0.8g sodium dodecyl sulfate (cleanup additive) and the balance water are mixed and stirred uniformly.
100, mlB components: 10g of ethyl formate (acid-generating main agent a), 7.5g of ammonium fluoride (acid-generating main agent b) and 1.2g of citric acid (iron ion stabilizer) with the balance of water, and uniformly mixing and stirring.
The preparation method of the environment-friendly autogenous acid fracturing fluid comprises the following steps:
mixing the component A for standby;
mixing the component B for standby;
mixing 60ml of A component and 30mlB component uniformly, stirring at room temperature at 200 rpm.
And (3) performing indoor test evaluation on the autogenous acid fracturing fluid system, adding 45ml of the autogenous acid fracturing fluid system into 50g of calcium carbonate rock powder at 100 ℃, and measuring the pH value of the solution and the final weight of the rock powder at fixed time. The pH value is reduced to about 1.5 within 120min, and the final corrosion rate is 11.98% after 4 h. The corrosion rate is determined by a weightlessness method (standard SY T5886-2012 retarded acid energy evaluation method), and the corrosion rate is calculated as follows:
wherein: c (C) R -dissolution rate of calcium carbonate,%;
m 1 -mass before calcium carbonate dissolution, g;
m 2 -filter paper mass, g;
m 3 -total mass of filter paper and filter residue after reaction, g.
Example 2
An environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B, wherein:
100ml of A component: 0.08g of acrylamide and AMPS copolymer (the drag reducer CNI3#, the drag reducer, the molecular weight of 1000 ten thousand, the clay stabilizer), 0.4g of potassium chloride, 0.7g of dodecyl betaine (cleanup additive) and the balance of water are mixed and stirred uniformly.
100, mlB components: 5g of ethyl acetate (acid-generating main agent a), 10g of ammonium chloride (acid-generating main agent b) and 1.8g of sodium ethylenediamine tetraacetate (iron ion stabilizer) are mixed and stirred uniformly.
The preparation method of the environment-friendly autogenous acid fracturing fluid comprises the following steps:
mixing the component A for standby;
mixing the component B for standby;
mixing 30ml of A component and 60mlB component uniformly, stirring at room temperature at 100 rpm.
And (3) performing indoor test evaluation on the autogenous acid fracturing fluid system, adding 45ml of the autogenous acid fracturing fluid system into 50g of calcium carbonate rock powder at 100 ℃, and measuring the pH value of the solution and the final weight of the rock powder at fixed time. The pH value was lowered to about 1.5 within 120min, and the final dissolution rate was 10.14% for 4 hours, and the method for measuring and calculating the dissolution rate was as described in example 1.
Example 3
An environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B, wherein:
100ml of A component: 0.09g of acrylamide and vinylpyrrolidone copolymer (Beijing family Maishi oilfield chemical agent technology Co., ltd., drag reducer CNI5#, drag reducer, molecular weight 1200 ten thousand), 0.3g of ammonium chloride (clay stabilizer), 0.6g of dodecyl betaine (cleanup additive) and the balance of water, and uniformly mixing and stirring.
100, mlB components: 15g of ethyl lactate (acid-generating main agent a), 9g of ammonium chloride (acid-generating main agent b) and 1.0g of sodium ethylenediamine tetraacetate (iron ion stabilizer) are mixed and stirred uniformly.
The preparation method of the environment-friendly autogenous acid fracturing fluid comprises the following steps:
mixing the component A for standby;
mixing the component B for standby;
mixing 45ml of A component and 45mlB component uniformly, and stirring at room temperature for 300 rpm.
And (3) performing indoor test evaluation on the autogenous acid fracturing fluid system, adding 45ml of the autogenous acid fracturing fluid system into 50g of calcium carbonate rock powder at 100 ℃, and measuring the pH value of the solution and the final weight of the rock powder at fixed time. The pH value was lowered to about 1.5 within 120min, and the final dissolution rate was 10.45%, and the method for measuring and calculating the dissolution rate was as described in example 1.
Example 4
An environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B, wherein:
100ml of A component: 0.10g polyacrylamide (resistance reducer CNI1#, resistance reducer, molecular weight 800 ten thousand, beijing family Maishi oilfield chemical Co., ltd.), 0.2g tetramethyl ammonium chloride (clay stabilizer), 0.5g sodium dodecyl sulfate (cleanup additive), and the balance water were mixed and stirred uniformly.
100, mlB components: 20g of ethyl formate (acid-generating main agent a), 8g of ammonium fluoride (acid-generating main agent b) and 2.0g of EDTA sodium salt (iron ion stabilizer) are mixed and stirred uniformly.
The preparation method of the environment-friendly autogenous acid fracturing fluid comprises the following steps:
mixing the component A for standby;
mixing the component B for standby;
mixing 70ml of A component and 20mlB component uniformly, stirring at normal temperature for 200 r/min.
Selecting 40-70 mesh ceramsite with volume density of 1.71g/cm 3 The sedimentation time of the ceramsite in different slickwater fracturing fluids is tested at normal temperature, 100mL of fracturing fluid with a certain sand ratio (5%, 10% and 15%) is prepared, the fracturing fluid is poured into a 100mL measuring cylinder after being uniformly mixed, the seconds of sand sedimentation to a 50mL scale mark are measured, and the results are shown in Table 1.
TABLE 1 sedimentation time(s) for different sand ratios
Wherein, 1# is 0.05% drag reducer autogenous acid fracturing fluid, 2# is 0.07% drag reducer autogenous acid fracturing fluid, 3# is 0.1% drag reducer autogenous acid fracturing fluid, and 4# is 0.1% HPG slickwater fracturing fluid. As can be seen from table 1, as the concentration of the drag reducer solution increases, the settling time of the ceramsite proppant increases and the sand carrying performance increases. Compared with HPG slickwater fracturing fluid with the same concentration, the slickwater fracturing fluid has stronger sand carrying capacity.
Example 5
An environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B, wherein:
100ml of A component: 0.08g polyacrylamide (drag reducer CNI1# drag reducer, molecular weight 800 ten thousand, of the chemical agent technology Co., ltd., beijing), 0.5g potassium chloride (clay stabilizer), 0.8g sodium dodecyl sulfate (cleanup additive) and the balance water are mixed and stirred uniformly.
100, mlB components: 10g of ethyl formate (acid-generating main agent a), 10g of ammonium chloride (acid-generating main agent b) and 1.2g of disodium ethylenediamine tetraacetate (iron ion stabilizer) are mixed and stirred uniformly.
The preparation method of the environment-friendly autogenous acid fracturing fluid comprises the following steps:
mixing the component A for standby;
mixing the component B for standby;
mixing 60ml of A component and 30mlB component uniformly, stirring at normal temperature for 200 r/min.
The prepared autogenous acid fracturing fluid is used for testing drag reduction performance at 80 ℃, and the testing method comprises the following steps: the pressure drop of the clean water and the fracturing fluid flowing through the metal pipeline of the vertical well with the length of 3m and the length of 8mm is measured, and then the pressure drop of the fracturing fluid is divided by the pressure drop of the clean water, namely the drag reduction rate, and the numerical values are shown in table 2.
Table 2 drag reduction rate of autogenous acid fracturing fluid
The self-generated acid fracturing fluid has better temperature resistance and drag resistance, and the highest drag reduction rate reaches 78% at 80 ℃. Under the condition of high-speed pumping fracturing, the self-generated acid fracturing fluid has a good cooling effect on a shaft, and the bottom-hole temperature is half of the bottom-hole temperature does not exceed 80 ℃.
Example 6
An environment-friendly autogenous acid fracturing fluid for relieving and inhibiting injuries comprises a component A and a component B, wherein:
100ml of A component: 0.08g of acrylamide-AMPS-acrylic acid copolymer (the technical company of chemical agent of the oil field of Maishi of Beijing, the drag reducer CNI3#, the drag reducer, the molecular weight of 1000 ten thousand), 0.5g of ammonium chloride (clay stabilizer) and 0.8g of sodium dodecyl benzene sulfonate (cleanup additive) are mixed, and the balance is water, and the mixture is uniformly mixed and stirred.
100, mlB components: 10g of ethyl acetate (acid-generating main agent a), 7.5g of ammonium fluoride (acid-generating main agent b) and 1.2g of citric acid (iron ion stabilizer) are mixed and stirred uniformly.
The preparation method of the environment-friendly autogenous acid fracturing fluid comprises the following steps:
mixing the component A for standby;
mixing the component B for standby;
mixing 60ml of A component and 30mlB component uniformly, stirring at normal temperature for 200 r/min.
The injury-relieving effect of the natural rock core on the self-generated acid fracturing fluid is evaluated indoors. The test method comprises the following steps: washing oil from a natural rock core, drying, saturating simulated formation water, and then measuring initial permeability by using kerosene; respectively polluting natural rock cores by using injected water and reservoir crude oil at 80 ℃, and continuously measuring the permeability of the polluted rock cores by using kerosene; then, 2PV of self-acid fracturing fluid is injected, and after standing for 12 hours at 80 ℃, the permeability of the core after injury relief is measured continuously by using kerosene, and a permeability recovery value is calculated, and the results are shown in Table 3 and FIG. 1.
TABLE 3 permeability change before and after core deblocking
After the natural rock core is polluted by injected water and crude oil in a reservoir, the permeability is obviously reduced, which indicates that the reservoir is blocked by more serious inorganic scale and organic scale. After the damage is relieved by using the self-acid fracturing fluid, the permeability of the core is obviously increased, and the permeability recovery value reaches more than 100%, so that the system can effectively relieve inorganic scale and organic scale formed in the core, and can also reform the pores of the core matrix to play a role in expanding a seepage channel.
Comparative example 1:
200mL of a conventional hydrochloric acid system for drag reduction and acidification comprises 15g of hydrochloric acid, 0.08g of polyacrylamide (CNI2#, drag reducer, molecular weight 1000 ten thousand, of the Beijing family of Maishi oilfield chemical agents, inc.), 0.5g of ammonium chloride (clay stabilizer), 0.8g of sodium dodecyl benzene sulfonate (cleanup additive), 1.2g of citric acid (ferric ion stabilizer), and the balance of water, wherein the components are mixed and stirred uniformly.
The conventional hydrochloric acid system was subjected to an indoor test evaluation, 45ml of conventional hydrochloric acid was added to 50g of calcium carbonate rock powder at 100℃and the pH value of the solution and the final weight of the rock powder were measured at regular intervals. The final dissolution rate after 4 hours was 18.19% after the pH value was lowered to about 1.5 within 5 minutes, and the method for measuring and calculating the dissolution rate was as described in example 1. The reaction rate of hydrochloric acid is higher, the final corrosion rate is higher, and the slow speed deep acidification is not realized.
Comparative example 2:
100mL of a conventional slick water fracturing fluid comprises 0.08g of polyacrylamide (the technical company of Maishi oilfield chemical agents, beijing, the molecular weight of which is 1000 ten thousand), drag reducer CNI2#, drag reducer, 0.5g of ammonium chloride (clay stabilizer), 0.8g of sodium dodecyl benzene sulfonate (cleanup additive), 1.2g of citric acid (ferric ion stabilizer) and the balance of water, and the components are mixed and stirred uniformly.
The injury-relieving effect of the conventional slickwater fracturing fluid is evaluated indoors by using natural rock cores. The test method comprises the following steps: washing oil from a natural rock core, drying, saturating simulated formation water, and then measuring initial permeability to 0.0213mD by using kerosene at 80 ℃; respectively polluting natural rock cores by using injected water and reservoir crude oil at 80 ℃, and continuously measuring the permeability of 0.00612mD after rock core pollution by using kerosene; then, 2PV of conventional slick water fracturing fluid is injected, and after standing for 12 hours at 80 ℃, the permeability of the core after injury relief is measured by using kerosene, wherein the permeability is 0.00389mD. The conventional slick water has no injury removing capability, but can continuously damage a reservoir, and the injury rate is as high as 81.74%.
The foregoing detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but is to be accorded the full scope of all such equivalents and modifications so as not to depart from the scope of the invention.
Claims (10)
1. An environment-friendly self-generated acid fracturing fluid for relieving and inhibiting injuries is characterized by comprising a component A and a component B,
the component A comprises water, a drag reducer, a clay stabilizer and a cleanup additive;
the component B comprises water, an acid-generating main agent a, an acid-generating main agent B and an iron ion stabilizer;
wherein the acid-generating main agent a is at least one of ethyl formate, ethyl acetate and ethyl lactate;
the acid-generating main agent b is ammonium chloride and/or ammonium fluoride.
2. The self-acid fracturing fluid of claim 1,
in the component A, the mass percentage of each component in the component A is as follows: 0.07-0.1wt% of drag reducer, 0.2-0.5wt% of clay stabilizer, 0.5-0.8wt% of cleanup additive and the balance of water;
in the component B, the mass percentages of the components in the component B are as follows: 5-20wt% of acid generation main agent a, 7.5-10wt% of acid generation main agent b, 1-2wt% of iron ion stabilizer and the balance of water;
the volume ratio of the component A to the component B is 1:2 to 7:2.
3. The autogenous acid fracturing fluid of claim 2, wherein the volume ratio of the a component to the B component is 2:1.
4. The self-acid fracturing fluid of claim 1, wherein said drag reducer is a polyacrylamide or a copolymer of acrylamide.
5. The authigenic acid fracturing fluid of claim 1 wherein the clay stabilizer is at least one of an organic quaternary ammonium salt, potassium chloride, ammonium chloride, and choline chloride.
6. The self-acid fracturing fluid of claim 1, wherein said drainage aid is an anionic surfactant.
7. The self-acid fracturing fluid of claim 1, wherein the drainage aid is sodium dodecyl sulfate and/or dodecyl betaine.
8. The authigenic acid fracturing fluid of claim 1, wherein the iron ion stabilizer is at least one of disodium edetate, citric acid, and EDTA sodium salt.
9. The method for preparing the environmentally-friendly autogenous acid fracturing fluid for removing and inhibiting injuries according to any one of claims 1 to 8, which is characterized by comprising the following steps:
(1) Mixing the component A for standby;
(2) Mixing the component B for standby;
(3) And uniformly mixing the component A and the component B, and stirring to obtain the finished product.
10. The method according to claim 9, wherein the stirring speed in the step (3) is not less than 100 rpm.
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