CN111117584A - Neutral blocking remover for water injection well of ultra-low permeability reservoir and preparation method - Google Patents
Neutral blocking remover for water injection well of ultra-low permeability reservoir and preparation method Download PDFInfo
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Abstract
The invention discloses a neutral blocking remover for an ultra-low permeability reservoir water injection well and a preparation method thereof, wherein the neutral blocking remover consists of an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing. The neutral blocking remover for the water injection well of the ultra-low permeability reservoir comprises an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water.
Description
Technical Field
The invention belongs to the technical field of chemicals for petroleum industry, and particularly relates to a neutral blocking remover for an ultra-low permeability reservoir water injection well and a preparation method thereof.
Background
With the continuous development of oil fields, development objects are gradually changed from low-permeability reservoirs to ultra-low-permeability and ultra-low-permeability reservoirs, the development difficulty is increased day by day, and the problem of insufficient injection of the ultra-low-permeability reservoirs is more prominent. At present, the water well injection increasing mode mainly adopts acidification, and the acidification is mainly divided into conventional acidification by pulling a tubular column and online acidification mainly by pressing pressure. However, in the conventional acidification, the construction processes of water drainage and pressure relief of a water well, acidification pipe column under a source removal pipe column, residual liquid flowback and the like exist, the well occupation time is long, the acidification process is complex, and the labor intensity is high; when the pressure is acidized, the acid liquor corrodes the original pipe column to a certain extent, and when the pipe column which is not subjected to string detection all the year round is encountered, the risk of corrosion of the acidizing on the perforation of the oil pipe possibly exists, even the corrosion of the acid liquor on the sleeve is caused, and a larger risk is caused, so that the safety and environmental protection risk is caused. In addition, a special acid tank truck is needed for transporting and storing the acid liquor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a neutral blocking remover for an ultra-low permeability reservoir water injection well and a preparation method thereof, and overcomes the defects of the prior art that 1: in the conventional acidification, the construction processes of water drainage and pressure relief of a water well, acidification pipe column under a starting pipe column, residual liquid flowback and the like exist, the well occupation time is long, the acidification process is complex, and the labor intensity is high; 2: when the pressure is acidified, the acid liquor corrodes the original pipe column to a certain extent, and when the pipe column is not checked all the year round, the risk of corrosion of the acidification on the perforation of the oil pipe can exist, even the corrosion of the acid liquor on the sleeve can be caused, so that a larger risk is caused, and the safety and environmental protection risk is caused; 3: the transportation and the storage of the acid liquor need a special acid tank truck, and the like.
In order to solve the technical problem, the technical scheme of the invention is as follows: a neutral blocking remover for an ultra-low permeability reservoir water injection well comprises an ethylene oxide condensation compound, a rapid permeability agent T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 3% -5% of an ethylene oxide condensation compound, 8% -10% of a quick penetrating agent T, 15% -20% of an AA-AMPS-HPA terpolymer, 8% -12% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 4% of ethylene oxide condensate, 9% of quick penetrating agent T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and water to make up the balance.
Preferably, the ethylene oxide condensate is an ethylene oxide condensate PEG-800, the molecular weight of the ethylene oxide condensate PEG-800 is 720-880, the hydroxyl value of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7.
Preferably, the quick penetrating agent T is dioctyl sodium sulfosuccinate, the penetrating power is less than or equal to 5 seconds, the AA-AMPS-HPA terpolymer is a terpolymer scale inhibitor acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-hydroxypropyl acrylate, the molecular weight is 1500-2000, and the PH value of a 1% aqueous solution of the AA-AMPS-HPA terpolymer is 4-5.
Preferably, the neutral blocking remover is liquid at normal temperature, is easy to dissolve in water, has a pH value of 6.5-7.5, and has a density of 1.2-1.3g/cm3The corrosion rate is 0.15g/m2•h。
Preferably, the preparation method of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir comprises the following steps:
step 1) sequentially adding 2-10% of an ethylene oxide condensation compound, 5-20% of a rapid penetrating agent T, 10-30% of an AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Preferably, the scale dissolution rate test process of the step 3) is as follows: adding 5.0g of neutral blocking remover and 5.0g of water into a container, adding 1.5g of calcium carbonate or calcium sulfate or barium sulfate powder, adding 88.5g of water after complete reaction, standing at a constant temperature of 60 ℃ for 1h, filtering the solution by using medium-speed quantitative filter paper after the reaction is finished, putting the filter residue and the filter paper into a 105 ℃ oven, taking out after 4h, putting into a dryer, weighing after 30min, and recording the mass as m2Wherein the scale dissolution rate is calculated according to the following formula:
in the formula:
r-dirty-dissolving rate,%;
m1-mass of scale sample before test, g;
m0-filter paper mass, g;
m2mass of filter residue and filter paper after test, g.
Compared with the prior art, the invention has the advantages that:
(1) the neutral blocking remover for the water injection well of the ultra-low permeability reservoir comprises an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, has small corrosivity on an oil pipe, has a good corrosion action on calcium carbonate, calcium sulfate, barium sulfate and the like in a water injection well in a near-wellbore area, cannot generate new precipitates, has a good blocking removal effect after measures, and has an obvious effect of reducing pressure and increasing injection;
(2) the neutral blocking remover for the water injection well of the ultra-low permeability reservoir is neutral, compared with acid liquor, the neutral blocking remover is safer and more reliable, is simple and convenient to construct, does not need to carry out flowback after measures, has short well occupying time, simple acidification procedures and low labor intensity, is safer to transport compared with the acid liquor, does not need a special acid tank truck, and has a better blocking removing effect on the water injection well of the ultra-low permeability reservoir, so that the water injection well can stably inject water for a long time;
(3) the neutral blocking remover for the water injection well of the ultra-low permeability reservoir has the advantages of good compatibility effect of all components, good corrosion effect, long corrosion time, low cost and environment-friendly components, and in addition, the preparation method of the neutral blocking remover is simple, easy to produce and not harsh in reaction conditions.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other elements shown in the specification are included for the purpose of understanding and reading only, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1
The invention discloses a neutral blocking remover for an ultra-low permeability reservoir water injection well, which consists of an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
Example 2
The invention discloses a neutral blocking remover for an ultra-low permeability reservoir water injection well, which consists of an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 3% -5% of an ethylene oxide condensation compound, 8% -10% of a quick penetrating agent T, 15% -20% of an AA-AMPS-HPA terpolymer, 8% -12% of ammonium bifluoride and water for balancing.
Example 3
The invention discloses a neutral blocking remover for an ultra-low permeability reservoir water injection well, which consists of an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 3% -5% of an ethylene oxide condensation compound, 8% -10% of a quick penetrating agent T, 15% -20% of an AA-AMPS-HPA terpolymer, 8% -12% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 4% of ethylene oxide condensate, 9% of quick penetrating agent T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and water to make up the balance.
Example 4
The invention discloses a neutral blocking remover for an ultra-low permeability reservoir water injection well, which consists of an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 3% -5% of an ethylene oxide condensation compound, 8% -10% of a quick penetrating agent T, 15% -20% of an AA-AMPS-HPA terpolymer, 8% -12% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 4% of ethylene oxide condensate, 9% of quick penetrating agent T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and water to make up the balance.
Preferably, the ethylene oxide condensate is an ethylene oxide condensate PEG-800, the molecular weight of the ethylene oxide condensate PEG-800 is 720-880, the hydroxyl value of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7.
Preferably, the quick penetrating agent T is dioctyl sodium sulfosuccinate, the penetrating power is less than or equal to 5 seconds, the AA-AMPS-HPA terpolymer is a terpolymer scale inhibitor acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-hydroxypropyl acrylate, the molecular weight is 1500-2000, and the PH value of a 1% aqueous solution of the AA-AMPS-HPA terpolymer is 4-5.
Example 5
The invention discloses a neutral blocking remover for an ultra-low permeability reservoir water injection well, which consists of an ethylene oxide condensation compound, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 3% -5% of an ethylene oxide condensation compound, 8% -10% of a quick penetrating agent T, 15% -20% of an AA-AMPS-HPA terpolymer, 8% -12% of ammonium bifluoride and water for balancing.
Preferably, the weight percentage of each component is as follows: 4% of ethylene oxide condensate, 9% of quick penetrating agent T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and water to make up the balance.
Preferably, the ethylene oxide condensate is an ethylene oxide condensate PEG-800, the molecular weight of the ethylene oxide condensate PEG-800 is 720-880, the hydroxyl value of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7.
Preferably, the quick penetrating agent T is dioctyl sodium sulfosuccinate, the penetrating power is less than or equal to 5 seconds, the AA-AMPS-HPA terpolymer is a terpolymer scale inhibitor acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-hydroxypropyl acrylate, the molecular weight is 1500-2000, and the PH value of a 1% aqueous solution of the AA-AMPS-HPA terpolymer is 4-5.
Preferably, the neutral blocking remover is liquid at normal temperature and is easily dissolved in water, the pH value of the neutral blocking remover is 6.5-7.5, and the density of the neutral blocking remover is 1.2-1.3 g-cm3The corrosion rate is 0.15g/m2•h。
Preferably, the preparation method of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir comprises the following steps:
step 1) sequentially adding 2-10% of an ethylene oxide condensation compound, 5-20% of a rapid penetrating agent T, 10-30% of an AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Preferably, the scale dissolution rate test process of the step 3) is as follows: adding 5.0g of neutral blocking remover and 5.0g of water into a container (a plastic beaker), adding 1.5g of calcium carbonate or calcium sulfate or barium sulfate powder, adding 88.5g of water after the reaction is completed, standing at a constant temperature of 60 ℃ for 1h, filtering the solution by using medium-speed quantitative filter paper after the reaction is finished, putting the filter residue and the filter paper into a 105 ℃ oven, taking out the filter residue and the filter paper after 4h, putting the filter residue and the filter paper into a dryer, weighing after 30min, and recording the mass of the filter residue as m2Wherein the scale dissolution rate is calculated according to the following formula:
in the formula:
r-dirty-dissolving rate,%;
m1-mass of scale sample before test, g;
m0-filter paper mass, g;
m2mass of filter residue and filter paper after test, g.
Example 6
10kg of a neutral blocking remover was prepared, in which 4% of the ethylene oxide condensate PEG-800, 10% of the fast penetrant T, 20% of the AA-AMPS-HPA terpolymer were weighed12% of ammonium bifluoride and the balance of water; the content of the effective component of the ethylene oxide condensate PEG-800 is 99%, the hydroxyl value (mgKOH/g) of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7; the content of the active ingredient of the sodium dioctyl sulfosuccinate in the rapid penetrating agent T is 99%, wherein the penetrating power is as follows: less than or equal to 5 seconds (1% water solution, 25 ℃); the AA-AMPS-HPA terpolymer has an effective component content of 30% and a density of 1.15g/cm3The pH value (1% aqueous solution) is 4-5; the content of the effective component of the ammonium bifluoride is 98%.
Step 1) sequentially adding 4% of ethylene oxide condensate PEG-800, 10% of rapid penetrant T, 20% of AA-AMPS-HPA terpolymer, 12% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Example 7
Preparing 10kg of neutral blocking remover, wherein 5% of ethylene oxide condensate PEG-800, 8% of rapid penetrant T, 15% of AA-AMPS-HPA terpolymer, 8% of ammonium bifluoride and the balance of water are weighed; the content of the effective component of the ethylene oxide condensate PEG-800 is 99%, the hydroxyl value (mgKOH/g) of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7; the content of the active ingredient of the sodium dioctyl sulfosuccinate in the rapid penetrating agent T is 99%, wherein the penetrating power is as follows: less than or equal to 5 seconds (1% water solution, 25 ℃); the AA-AMPS-HPA terpolymer has an effective component content of 30% and a density of 1.15g/cm3The pH value (1% aqueous solution) is 4-5; the content of the effective component of the ammonium bifluoride is 98%.
Step 1) adding 5% of ethylene oxide condensate PEG-800, 8% of rapid penetrant T, 15% of AA-AMPS-HPA terpolymer, 8% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle in sequence;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Example 8
Preparing 10kg of neutral blocking remover, wherein 4% of ethylene oxide condensate PEG-800, 9% of rapid penetrant T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and the balance of water are weighed; the content of the effective component of the ethylene oxide condensate PEG-800 is 99%, the hydroxyl value (mgKOH/g) of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7; the content of the active ingredient of the sodium dioctyl sulfosuccinate in the rapid penetrating agent T is 99%, wherein the penetrating power is as follows: less than or equal to 5 seconds (1% water solution, 25 ℃); the AA-AMPS-HPA terpolymer has an effective component content of 30% and a density of 1.15g/cm3The pH value (1% aqueous solution) is 4-5; the content of the effective component of the ammonium bifluoride is 98%.
Step 1) sequentially adding 4% of ethylene oxide condensate PEG-800, 9% of rapid penetrant T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Example 9
Preparing 10kg of neutral blocking remover, wherein 3% of ethylene oxide condensate PEG-800, 8% of rapid penetrant T, 15% of AA-AMPS-HPA terpolymer, 12% of ammonium bifluoride and the balance of water are weighed; the content of the effective component of the ethylene oxide condensate PEG-800 was 99%, and the hydroxyl value thereof was: (mgKOH/g) of 127 to 156, wherein the pH value of a 1% aqueous solution of an ethylene oxide condensate PEG-800 is 5 to 7; the content of the active ingredient of the sodium dioctyl sulfosuccinate in the rapid penetrating agent T is 99%, wherein the penetrating power is as follows: less than or equal to 5 seconds (1% water solution, 25 ℃); the AA-AMPS-HPA terpolymer has an effective component content of 30% and a density of 1.15g/cm3The pH value (1% aqueous solution) is 4-5; the content of the effective component of the ammonium bifluoride is 98%.
Step 1) adding 3% of ethylene oxide condensate PEG-800, 8% of rapid penetrant T, 15% of AA-AMPS-HPA terpolymer, 12% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle in sequence;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Example 10
Preparing 10kg of neutral blocking remover, wherein 2% of ethylene oxide condensate PEG-800, 20% of rapid penetrant T, 10% of AA-AMPS-HPA terpolymer, 18% of ammonium bifluoride and the balance of water are weighed; the content of the effective component of the ethylene oxide condensate PEG-800 is 99%, the hydroxyl value (mgKOH/g) of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7; the content of the active ingredient of the sodium dioctyl sulfosuccinate in the rapid penetrating agent T is 99%, wherein the penetrating power is as follows: less than or equal to 5 seconds (1% water solution, 25 ℃); the AA-AMPS-HPA terpolymer has an effective component content of 30% and a density of 1.15g/cm3The pH value (1% aqueous solution) is 4-5; the content of the effective component of the ammonium bifluoride is 98%.
Step 1) sequentially adding 2% of ethylene oxide condensate PEG-800, 20% of rapid penetrant T, 10% of AA-AMPS-HPA terpolymer, 18% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
Example 11
Preparing 10kg of neutral blocking remover, wherein 10% of ethylene oxide condensate PEG-800, 5% of rapid penetrant T, 30% of AA-AMPS-HPA terpolymer, 5% of ammonium bifluoride and the balance of water are weighed; the content of the effective component of the ethylene oxide condensate PEG-800 is 99%, the hydroxyl value (mgKOH/g) of the ethylene oxide condensate PEG-800 is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7; the content of the active ingredient of the sodium dioctyl sulfosuccinate in the rapid penetrating agent T is 99%, wherein the penetrating power is as follows: less than or equal to 5 seconds (1% water solution, 25 ℃); the AA-AMPS-HPA terpolymer has an effective component content of 30% and a density of 1.15g/cm3The pH value (1% aqueous solution) is 4-5; the content of the effective component of the ammonium bifluoride is 98%.
Step 1) adding 10% of ethylene oxide condensate PEG-800, 5% of rapid penetrant T, 30% of AA-AMPS-HPA terpolymer, 5% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle in sequence;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
The components of the invention are all commercial products.
Comparative example 1: the existing acidic blocking remover is purchased in the market.
Comparative example 2: the existing neutral blocking remover is purchased in the market.
And (3) carrying out performance test on the product of the application example:
test 1: the performance of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir stratum in the application examples 6-11 and the performance of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir stratum in the comparative examples 1-2 are evaluated, the pH value is tested according to GB/T23769-2009 general method for measuring pH value in aqueous solution of inorganic chemical products, and the interfacial tension of the product is tested according to SY/T5370-1999 method for measuring surface and interfacial tension; the anti-swelling performance of the product is tested according to SY/T5971-1994 performance evaluation method of clay stabilizer for water injection; and testing the scale inhibition rate of calcium carbonate, calcium sulfate and barium sulfate of the product according to Q/SY126-2014 technical Specification of corrosion and scale inhibitors for oilfield water treatment.
Testing of erosion Rate
Respectively adding 5.0g of the neutral blocking remover in examples 6 to 11 and 5.0g of water in comparative examples 1 to 2 into 8 plastic beakers, respectively adding 1.5g of calcium carbonate powder, respectively adding 88.5g of water after complete reaction, standing at a constant temperature of 60 ℃ for 1h, filtering the solution by using medium-speed quantitative filter paper after the reaction is finished, putting the filter residue and the filter paper into a 105 ℃ oven, taking out the filter residue and the filter paper after 4h, putting the filter residue and the filter paper into a dryer, weighing and recording the mass as m after 30min2(ii) a Wherein the scale dissolution rate is calculated by the following formula:
in the formula:
r-dirty-dissolving rate,%;
m1-mass of scale sample before test, g;
m0-filter paper mass, g;
m2mass of filter residue and filter paper after test, g.
The performance test results of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir in the application examples 6-11 and the performance test results of the comparative examples 1-2 are shown in the following table 1:
TABLE 1 application of neutral blocking remover for ultra-low permeability reservoir flooding well of examples 6-11 and Performance test of comparative examples 1-2
As shown in Table 1, the ultra low density of the present inventionThe pH value of the neutral blocking remover for the water injection well of the seepage reservoir is 7; the scale inhibition rate of calcium carbonate is more than or equal to 97 percent, the scale inhibition rate of calcium sulfate is more than or equal to 98 percent, the scale inhibition rate of barium sulfate is more than or equal to 76 percent, and the interfacial tension is less than or equal to 10 percent-2mN/m, and the scale dissolution rate is more than or equal to 85 percent. Compared with a comparative example, the neutral blocking remover can effectively reduce the tension of an oil-water interface, remove the blockage formed by calcium carbonate and organic matters, relieve the formation scaling and improve the efficiency of an injection well.
Aiming at an HJ12 water well, the oil pressure of the well is 21.2MPa before the measures, the injection allocation is 25 square/day, the actual injection is 3-5 square/day, the wellbore sampling test shows that calcium sulfate and barium sulfate scale exist in the near wellbore region of the well, the neutral blocking remover is adopted for 20 square, the well mouth is pumped by a cement truck, the well closing reaction is carried out for 24 hours, the comparison after the measures shows that the oil pressure of the well is reduced to 17.0MPa, the daily injection reaches 25 square/day, the injection allocation requirement is met, the oil pressure is still 17.5MPa after 5 months of the measures until now, the injection allocation requirement is met, and the measure effect is good.
The working principle of the invention is as follows:
the neutral blocking remover for the water injection well of the ultra-low permeability reservoir comprises an ethylene oxide condensate, a rapid penetrant T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the ethylene oxide condensate mainly serves as a wetting agent to change the wettability of a stratum core and change the surface of a wettability rock into strong hydrophobicity, the rapid penetrant T is soluble in water and serves as a surfactant and is mainly used for reducing the surface tension of oil and water and removing blocking caused by stratum organic matters, the AA-AMPS-HPA terpolymer has a strong inhibiting effect on calcium carbonate, calcium sulfate and the like in water, the ammonium bifluoride generates hydrofluoric acid by utilizing the water base of the ammonium bifluoride and dissolves silicate scale, the blocking remover is slowly released after entering a stratum and can effectively dissolve scale samples such as calcium carbonate, calcium sulfate and the like in a near-well zone, the measure effect is good, and the neutral blocking remover for the water injection well of the ultra-low permeability reservoir, the oil pipe is less corrosive, the corrosion inhibitor has a good corrosion effect on calcium carbonate, calcium sulfate, barium sulfate and the like in a water injection well near a well zone, new precipitates cannot be generated, the blockage removal effect is good after measures are taken, and the pressure reduction and injection increase effect is obvious.
The neutral blocking remover for the water injection well of the ultra-low permeability reservoir is neutral, compared with acid liquor, the neutral blocking remover is safer and more reliable, is simple and convenient to construct, does not need to carry out flowback after measures, has short well occupying time, simple acidification procedures and low labor intensity, is safer to transport compared with the acid liquor, does not need a special acid tank truck, and has a better blocking removing effect on the water injection well of the ultra-low permeability reservoir, so that the water injection well can stably inject water for a long time.
The neutral blocking remover for the water injection well of the ultra-low permeability reservoir has the advantages of good compatibility effect of all components, good corrosion effect, long corrosion time, low cost and environment-friendly components, and in addition, the preparation method of the neutral blocking remover is simple, easy to produce and not harsh in reaction conditions.
The corrosion rate of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir stratum is low and is only 0.15g/m2H, the standard reaches the first-level industrial standard, and the water injection pipe column can be ensured not to be corroded in the construction process.
The neutral blocking remover for the water injection well of the ultra-low permeability reservoir is convenient to store and transport due to the neutral characteristic, has been used for injection in the ultra-low permeability oil field block in the Changqing oil field part, achieves a better test effect, and achieves the purpose of stable water injection for a long time through injection of the neutral blocking remover for the water injection well.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (8)
1. A neutral blocking remover for an ultra-low permeability reservoir water injection well is characterized in that: the rapid penetration agent comprises an ethylene oxide condensate, a rapid penetration agent T, AA-AMPS-HPA terpolymer, ammonium bifluoride and water, wherein the weight percentage of each component is as follows: 2-10% of ethylene oxide condensation compound, 5-20% of quick penetrating agent T, 10-30% of AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and water for balancing.
2. The neutral blocking remover for the water injection well of the ultra-low permeability reservoir of claim 1, which is characterized in that: the weight percentage of each component is as follows: 3% -5% of an ethylene oxide condensation compound, 8% -10% of a quick penetrating agent T, 15% -20% of an AA-AMPS-HPA terpolymer, 8% -12% of ammonium bifluoride and water for balancing.
3. The neutral blocking remover for the water injection well of the ultra-low permeability reservoir of claim 2, which is characterized in that: the weight percentage of each component is as follows: 4% of ethylene oxide condensate, 9% of quick penetrating agent T, 16% of AA-AMPS-HPA terpolymer, 10% of ammonium bifluoride and water to make up the balance.
4. The neutral blocking remover for the water injection well of the ultra-low permeability reservoir of claim 3, which is characterized in that: the ethylene oxide condensate is an ethylene oxide condensate PEG-800, the molecular weight of the ethylene oxide condensate is 720-880, the hydroxyl value of the ethylene oxide condensate is 127-156, and the pH value of a 1% aqueous solution of the ethylene oxide condensate PEG-800 is 5-7.
5. The neutral blocking remover for the water injection well of the ultra-low permeability reservoir of claim 3, which is characterized in that: the quick penetrant T is dioctyl sodium sulfosuccinate, the penetrability is less than or equal to 5 seconds, the AA-AMPS-HPA terpolymer is a terpolymer scale inhibitor acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-hydroxypropyl acrylate, the molecular weight is 1500-2000, and the PH value of a 1% aqueous solution of the AA-AMPS-HPA terpolymer is 4-5.
6. The neutral blocking remover for the water injection well of the ultra-low permeability reservoir of claim 3, which is characterized in that: the neutral blocking remover is liquid at normal temperature, is easy to dissolve in water, and has a pH value of 6.5-7.5 and a density of 1.2-1.3g/cm3The corrosion rate is 0.15g/m2•h。
7. The preparation method of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
step 1) sequentially adding 2-10% of an ethylene oxide condensation compound, 5-20% of a rapid penetrating agent T, 10-30% of an AA-AMPS-HPA terpolymer, 5-18% of ammonium bifluoride and the balance of water into an acid-alkali resistant reaction kettle;
step 2), closing a feed inlet valve after the feeding is finished, starting stirring, fully stirring in the acid-base resistant reaction kettle for 30 minutes, and stopping stirring after the system liquid is uniformly stirred;
and 3) detecting the PH, density and scale dissolution rate of the system liquid, metering and packaging the system liquid out of the kettle after the quality inspection is qualified, and obtaining the neutral blocking remover for the water injection well.
8. The preparation method of the neutral blocking remover for the water injection well of the ultra-low permeability reservoir of claim 7, wherein the scale dissolution rate test process of the step 3) is as follows: adding 5.0g of neutral blocking remover and 5.0g of water into a container, adding 1.5g of calcium carbonate or calcium sulfate or barium sulfate powder, adding 88.5g of water after complete reaction, standing at a constant temperature of 60 ℃ for 1h, filtering the solution by using medium-speed quantitative filter paper after the reaction is finished, putting the filter residue and the filter paper into a 105 ℃ oven, taking out after 4h, putting into a dryer, weighing after 30min, and recording the mass as m2Wherein the scale dissolution rate is calculated according to the following formula:
in the formula:
r-dirty-dissolving rate,%;
m1-mass of scale sample before test, g;
m0-filter paper mass, g;
m2mass of filter residue and filter paper after test, g.
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