CN114316934B - Low-corrosiveness polyacrylic acid blocking remover capable of being mixed with acid solution, and preparation method and application thereof - Google Patents
Low-corrosiveness polyacrylic acid blocking remover capable of being mixed with acid solution, and preparation method and application thereof Download PDFInfo
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- CN114316934B CN114316934B CN202111658831.4A CN202111658831A CN114316934B CN 114316934 B CN114316934 B CN 114316934B CN 202111658831 A CN202111658831 A CN 202111658831A CN 114316934 B CN114316934 B CN 114316934B
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Abstract
The invention discloses a low-corrosiveness polyacrylic acid blocking remover capable of being mixed with acid liquor, and a preparation method and application thereof. The blocking remover comprises ammonium persulfate, PBTCA, acid, an acidification corrosion inhibitor, a cleanup additive or micelle agent, vaseline, span-80 and water. The method comprises the steps of preheating vaseline to be in a liquid state; then adding water, acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank in sequence, and stirring uniformly to obtain the anti-corrosion paint. The blocking remover can be applied to solve the problem of polymer blocking after oilfield injection. According to the blocking remover, the acid solution (highest price) which cannot be oxidized is added, and the acid of the blocking remover is utilized to inhibit the decomposition of oxides, so that the corrosiveness in the construction process is reduced; after the acid liquor enters the target stratum, the acid liquor reacts with the rock, and the pH value and the temperature are increased, so that the decomposition speed of oxides is increased, and the purpose of oxidizing and unblocking is achieved.
Description
Technical Field
The invention relates to the field of polyacrylic acid blocking remover, in particular to a low-corrosiveness polyacrylic acid blocking remover capable of being mixed with acid liquor, and a preparation method and application thereof.
Background
In tertiary oil recovery in oil fields, a large amount of polyacrylamide is used for oil displacement, profile control and water shutoff, which causes the problem of polymer blockage of stratum, shaft, equipment, pipelines and the like.
Most of polymer plugs in the stratum to be removed need to be used together with acid liquor for removing the plugs. To remove inorganic blockage of sand, clay and other minerals and rust and scale in the rock stratum, acid liquor is generally used for removing the blockage; the organic blockage of polyacrylamide is removed by an oxidant.
However, the use of oxidizing agents causes corrosion problems, and generally has poor compatibility with acid solutions, and meanwhile, severe reactions are easy to occur or severe corrosion is caused to construction equipment and underground pipe columns.
Disclosure of Invention
Therefore, the invention provides a low-corrosiveness polyacrylic acid blocking remover which can be mixed with acid liquor, and a preparation method and application thereof, so as to solve the problems that the existing blocking remover has poor compatibility with the acid liquor, is easy to cause severe reaction during use, and can cause serious corrosion to construction equipment and the like.
In order to achieve the above object, the present invention provides the following technical solutions:
according to a first aspect of the present invention there is provided a low corrosiveness polyacrylic acid plug remover which is miscible with acid solution, the plug remover comprising ammonium persulfate, PBTCA, acid, acidizing corrosion inhibitor, drainage aid or micelle agent, petrolatum, span-80 and water.
Further, the blocking remover comprises the following raw materials in percentage: 0.5 to 5 percent of ammonium sulfate, 0.1 to 2 percent of PBTCA, 1 to 10 percent of acid, 0.3 to 2 percent of acidizing corrosion inhibitor, 0.1 to 1 percent of cleanup additive or micelle agent, 0.1 to 1 percent of Vaseline, 0.1 to 1 percent of span and 78 to 97.8 percent of water.
Further, the acid is phosphoric acid.
Further, the cleanup additive or micelle agent is a fluorocarbon surfactant.
According to a second aspect of the present invention, there is provided a method for preparing the above-mentioned low-corrosiveness polyacryl plug remover which can be mixed with an acid solution, the method comprising preheating vaseline to be in a liquid state; then adding water, acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank in sequence, and stirring uniformly to obtain the anti-corrosion paint.
According to a third aspect of the invention, a low-corrosiveness polyacrylic acid blocking remover which can be mixed with acid liquor is provided, and can be applied to solving the problem of polymer blocking after oilfield injection.
Further, the method comprises the steps of extruding the plugging removing agent into a well by a pump truck, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
Further, the method comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well, setting a measured blocking remover in the well, displacing the blocking remover to an oil layer by clear water after the blocking remover is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
The blocking remover has a blocking removing action mechanism that:
1. oxidation. The active oxygen is released to oxidize the high molecular chain to become low molecular chain for degradation.
2. Dispersing. The dispersion function is used for reducing the viscosity of the polymer.
3. Shielding. The chelating agent component is preferentially combined with the metal cross-linking agent, so that the polymer is changed into a linear structure from a bulk structure, and the purpose of gel breaking is achieved.
The invention has the following advantages:
the acid liquor in the blocking remover inhibits the decomposition speed of the oxide, thereby reducing the corrosion of the oxide to steel; the oxidant is coated by the emulsifier, so that the corrosion of the oxidant is reduced, and the action of the oxidant is not influenced; the phosphorus element of the phosphoric acid is in the highest positive pentavalent, can not be oxidized any more, and can not react with the acid liquor when meeting the acid liquor, so that the stability of the phosphoric acid is improved; after the plugging removing agent enters the stratum, the plugging removing agent can be decomposed in an accelerated way along with the completion of the reaction of the acid liquid and the rock and the temperature rise, so that the reaction time is prolonged, and the plugging removing effect is improved.
According to the blocking remover, the acid solution (highest price) which cannot be oxidized is added, and the acid of the blocking remover is utilized to inhibit the decomposition of oxides, so that the corrosiveness in the construction process is reduced; after the acid liquor enters the target stratum, the acid liquor reacts with the rock, and the pH value and the temperature are increased, so that the decomposition speed of oxides is increased, and the purpose of oxidizing and unblocking is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.
FIG. 1 is a diagram showing the state of polymer plugs before deblocking of ST2-3X28 well in experimental example 1 provided by the present invention;
FIG. 2 shows the polymer plug state after the plug of the ST2-3X28 well in the experimental example 1 provided by the invention;
FIG. 3 is a schematic illustration of the bottom hole flushing prior to deblocking of ST1-3-78 wells in Experimental example 2 provided by the present invention;
FIG. 4 shows the polymer state after deblocking of ST1-3-78 wells in Experimental example 2 provided by the present invention;
FIG. 5 shows the polymer in gel form block out of the well before deblocking ST2-5X98 in Experimental example 3 provided by the present invention;
FIG. 6 shows the liquid state of the polymer after deblocking ST2-5X98 in experimental example 3 provided by the present invention.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1 Low corrosiveness Polyacryloyl blocking remover capable of being mixed with acid solution, and preparation method and application thereof
The blocking remover comprises the following raw materials in percentage: ammonium sulfate 0.5%, PBTCA 0.1%, phosphoric acid 3%, acidizing corrosion inhibitor 0.3%, cleanup additive or micelle agent 0.1%, vaseline 0.5%, span-80.1% and water 95.4%.
The preparation method comprises preheating vaseline to liquid state; and sequentially adding water, phosphoric acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank, and uniformly stirring to obtain the blocking remover.
The method for using the plugging removing agent of the embodiment comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well to form a plugging removing agent with a preset amount, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
Example 2 Low corrosiveness Polyacryloyl blocking remover capable of being mixed with acid solution, and preparation method and application thereof
The blocking remover comprises the following raw materials in percentage: 2.5% of ammonium sulfate, 1% of PBTCA, 5% of phosphoric acid, 2% of acidification corrosion inhibitor, 0.5% of cleanup additive or micelle agent, 1% of Vaseline, 0.1% of span-80 and 87.9% of water.
The preparation method comprises preheating vaseline to liquid state; and sequentially adding water, phosphoric acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank, and uniformly stirring to obtain the blocking remover.
The method for using the plugging removing agent of the embodiment comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well to form a plugging removing agent with a preset amount, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
Example 3 Low corrosiveness Polyacryloyl blocking remover capable of being mixed with acid solution, preparation method and application thereof
The blocking remover comprises the following raw materials in percentage: 5% of ammonium sulfate, 2% of PBTCA, 10% of phosphoric acid, 2% of acidification corrosion inhibitor, 1% of cleanup additive or micelle agent, 1% of Vaseline, 1% of span-80% and 78% of water.
The preparation method comprises preheating vaseline to liquid state; and sequentially adding water, phosphoric acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank, and uniformly stirring to obtain the blocking remover.
The method for using the plugging removing agent of the embodiment comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well to form a plugging removing agent with a preset amount, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
Example 4 Low corrosiveness Polyacryloyl blocking remover capable of being mixed with acid solution, preparation method and application thereof
The blocking remover comprises the following raw materials in percentage: 1.5% of ammonium sulfate, 1.5% of PBTCA, 7% of phosphoric acid, 1% of acidification corrosion inhibitor, 0.5% of cleanup additive or micelle agent, 1% of Vaseline, 1% of span-80% and 86.5% of water.
The preparation method comprises preheating vaseline to liquid state; and sequentially adding water, phosphoric acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank, and uniformly stirring to obtain the blocking remover.
The method for using the plugging removing agent of the embodiment comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well to form a plugging removing agent with a preset amount, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
Example 5 Low corrosiveness Polyacryloyl blocking remover capable of being mixed with acid solution, preparation method and application thereof
The blocking remover comprises the following raw materials in percentage: ammonium sulfate 0.5%, PBTCA 0.1%, phosphoric acid 1%, acidizing corrosion inhibitor 0.3%, cleanup additive or micelle agent 0.1%, vaseline 0.1%, span-80.1% and water 97.8%.
The preparation method comprises preheating vaseline to liquid state; and sequentially adding water, phosphoric acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank, and uniformly stirring to obtain the blocking remover.
The method for using the plugging removing agent of the embodiment comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well to form a plugging removing agent with a preset amount, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, closing the well, reacting for 24-48 hours, and recovering production after well flushing.
Experimental example 1
An ST2-3X28 well was subjected to a plugging removal test using the plugging removal agent of example 2. When the well is filled with crosslinked polyacrylamide, the pressure rises to cause blockage, and considering that the well is possibly blocked by polymers and inorganic matters, the method is designed to firstly fill in 5 parts of 12% hydrochloric acid, 20 parts of earthic acid, 10 parts of active water and 20 parts of polymer blocking remover, and then replace the blocking remover into an oil layer. The pressure change starts to be 8Mpa, and after 5 minutes, the pressure is increased to be 14Mpa, then the pressure is gradually reduced along with the pressure of the acid, and the pressure is reduced to be 6Mpa when the last car is hit. And then the well is opened normally after 48 hours of well closing reaction, the figure before blocking removal is shown in figure 1, and the figure 2 after blocking removal is shown.
Experimental example 2
The ST1-3-78 well was subjected to a plugging removal test using the plugging removal agent of example 4. When the well is injected with polyacrylamide, the injection amount is reduced due to the pressure rise, and considering that the well is possibly blocked by polymers and inorganic matters, 10 parts of 12% hydrochloric acid, 20 parts of compound acid, 30 parts of polymer blocking remover and 10 parts of displacing liquid are firstly injected, so that the blocking remover is displaced into an oil layer. The pressure change starts to be 14Mpa, and after 30 minutes, the pressure is reduced to be 10Mpa, then the pressure is gradually reduced along with the pressure of the acid, and the pressure is reduced to be 7Mpa when the last car is hit. After 48 hours of well closing reaction, well opening can be completed to prepare injection, the flushing out of the bottom of the well before the blockage removal is shown in figure 3, and the flushing out of the bottom of the well after the blockage removal is shown in figure 4.
Experimental example 3
A plug removal test was performed on ST2-5X98 wells using the plug remover of example 3. After the well starts to be injected with polyacrylamide, the initial oil pressure is 10.9 MPa, and the injection is 70 square/day. And then starting to finish the injection allocation. Considering that the well is mainly blocked by polymer and a small amount of inorganic matters, a compound acid 20-side and 40-side polymer blocking remover and a displacement fluid 12-side are designed. The pressure change starts to be 15Mpa, and after 10 minutes, the pressure is reduced to 10Mpa, and then the pressure is reduced to 8Mpa when the last car is hit along with the gradual reduction of the acid driving pressure. After the well is closed for 48 hours, injection allocation can be completed after the well is opened, the polymer is taken out from the well to be a gel-shaped block material before unblocking, which is shown in fig. 5, and the liquid after unblocking is shown in fig. 6.
Therefore, the plugging remover prepared by the invention can well remove the plugged oilfield well and has no corrosion effect on oilfield equipment.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (5)
1. The low-corrosiveness polyacrylic acid blocking remover capable of being mixed with acid liquor is characterized by comprising ammonium persulfate, PBTCA, acid, an acidification corrosion inhibitor, a cleanup additive or micelle agent, vaseline, span-80 and water;
the acid is phosphoric acid;
the cleanup additive or the micelle agent is a fluorocarbon surfactant;
the blocking remover comprises the following raw materials in percentage: 0.5 to 5 percent of ammonium sulfate, 0.1 to 2 percent of PBTCA, 1 to 10 percent of acid, 0.3 to 2 percent of acidizing corrosion inhibitor, 0.1 to 1 percent of cleanup additive or micelle agent, 0.1 to 1 percent of Vaseline, 0.1 to 1 percent of span and 78 to 97.8 percent of water.
2. The method for preparing the low-corrosiveness polyacrylic acid blocking remover capable of being mixed with acid liquor according to claim 1, wherein the method is characterized in that vaseline is preheated to be in a liquid state; then adding water, acid, PBTCA, an acidification corrosion inhibitor, a cleanup additive or micelle agent, liquid vaseline and span-80 into an anti-corrosion stirring tank in sequence, and stirring uniformly to obtain the anti-corrosion paint.
3. The use of a low corrosiveness polyacrylic acid plugging remover according to claim 1, for solving the problem of plugging of polymer after oilfield injection.
4. The use of the plugging removing agent according to claim 3, wherein the method is that the plugging removing agent is squeezed into a well by a pump truck to be set with a certain amount, the plugging removing agent is displaced to an oil layer by clean water after the plugging removing agent is squeezed, and then the production is resumed after the well is closed for 24-48 hours.
5. The use of a plugging removing agent according to claim 3, wherein the method comprises the steps of extruding acid liquor into a well, extruding the acid liquor into the well again to form a plugging removing agent with a measured amount, displacing the plugging removing agent to an oil layer by clear water after the plugging removing agent is extruded, and recovering production after well flushing after well closing reaction for 24-48 hours.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881674A (en) * | 2013-10-18 | 2014-06-25 | 中国石油化工股份有限公司 | Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover |
| CN106634915A (en) * | 2016-12-30 | 2017-05-10 | 西南石油大学 | Thickened oil well polymer plugging remover |
| CN108822819A (en) * | 2018-06-14 | 2018-11-16 | 兰州凯宏中原石油科技有限公司 | A kind of super low percolation oilfield oil-water well combined removing plug by acid liquid |
| CN111073617A (en) * | 2019-11-28 | 2020-04-28 | 中国海洋石油集团有限公司 | Self-emulsifying blockage removing liquid and preparation method thereof |
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- 2021-12-30 CN CN202111658831.4A patent/CN114316934B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103881674A (en) * | 2013-10-18 | 2014-06-25 | 中国石油化工股份有限公司 | Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover |
| CN106634915A (en) * | 2016-12-30 | 2017-05-10 | 西南石油大学 | Thickened oil well polymer plugging remover |
| CN108822819A (en) * | 2018-06-14 | 2018-11-16 | 兰州凯宏中原石油科技有限公司 | A kind of super low percolation oilfield oil-water well combined removing plug by acid liquid |
| CN111073617A (en) * | 2019-11-28 | 2020-04-28 | 中国海洋石油集团有限公司 | Self-emulsifying blockage removing liquid and preparation method thereof |
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