CN108373911B - Chelating blocking remover applied to medium-high permeability sandstone reservoir and preparation method thereof - Google Patents
Chelating blocking remover applied to medium-high permeability sandstone reservoir and preparation method thereof Download PDFInfo
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- CN108373911B CN108373911B CN201810347255.3A CN201810347255A CN108373911B CN 108373911 B CN108373911 B CN 108373911B CN 201810347255 A CN201810347255 A CN 201810347255A CN 108373911 B CN108373911 B CN 108373911B
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Abstract
The invention discloses a chelation blocking remover applied to a medium-high permeability sandstone reservoir and a preparation method thereof, and the chelation blocking remover comprises the following components in percentage by weight: 18-25 parts of DOTA derivative, 4-10 parts of iron ion stabilizer, 5-15 parts of surfactant, 4-10 parts of clay stabilizer, 5-12 parts of assistant and the balance of water; the preparation method of the invention is that according to the proportion of each component of the chelating deblocking fluid applied to the medium-high permeability sandstone reservoir, water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant are added in sequence, and the chelating deblocking fluid is prepared by uniformly mixing and compounding. The chelating deblocking liquid applied to the medium-high permeability sandstone reservoir and the preparation method thereof can avoid the defects of conventional acidification and solve the problem that the common chelating agent cannot erode clay, and compared with the conventional earth acid, the chelating deblocking liquid has the characteristics of good stability, low erosion rate to clay, no acid substances in the system, low corrosivity to equipment and tubular columns and the like.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a chelation blocking remover applied to a medium-high permeability sandstone reservoir and a preparation method thereof.
Background
At present, the blockage removal of a medium-high permeability sandstone reservoir is usually carried out by adopting conventional acidification, but the following problems exist:
(1) the conventional acidification has strong corrosivity and high requirement on blockage removal equipment;
(2) the corrosion performance is strong, and the excessive corrosion of a middle and high permeability layer is easy to cause, so that the sand is produced from the stratum;
(3) if the wastewater cannot be drained back in time, secondary sedimentation seriously damages the stratum;
(4) the treatment of the acidified flowback liquid is difficult.
Therefore, how to design a medium-high permeability sandstone reservoir chelating and blocking removal liquid, a preparation method and a blocking removal method which can avoid the defects of conventional acidification and solve the problem that a common chelating agent cannot dissolve clay is the subject of the diligent research of the inventor.
Disclosure of Invention
The invention aims to provide a chelation blocking-removing system applied to blocking removal of a medium-high permeability sandstone reservoir, which can avoid the defects of conventional acidification and solve the problem that a common chelating agent cannot corrode clay.
In order to realize the aim, the invention provides a chelation blocking remover applied to a medium-high permeability sandstone reservoir, which comprises the following components in percentage by weight: 18-25 parts of DOTA derivative, 4-10 parts of iron ion stabilizer, 5-15 parts of surfactant, 4-10 parts of clay stabilizer, 5-12 parts of assistant and the balance of water.
Preferably, the iron ion stabilizer is one or a mixture of citric acid, isoascorbic acid and EDTA.
Preferably, the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene stearyl ether.
Preferably, the clay stabilizer is a cationic quaternary ammonium salt.
Preferably, the auxiliary agent is a mixture of polyvinyl alcohol and low carbon alcohol ether.
A preparation method of the chelation deblocking liquid applied to the medium-high permeability sandstone reservoir is characterized in that water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant are sequentially added according to the proportion of the components of the chelation deblocking liquid applied to the medium-high permeability sandstone reservoir, and the components are mixed uniformly and then compounded to obtain the chelation deblocking liquid.
Preferably, the preparation temperature is 45-50 ℃.
Preferably, the preparation time is 3-4 h.
After the scheme is adopted, the chelating and plugging removing solution for the medium-high permeability sandstone reservoir is widely applied to offshore oil fields, can avoid the defects of conventional acidification and solve the problem that a common chelating agent cannot corrode clay, and compared with conventional earth acid, the chelating and plugging removing solution has the characteristics of good stability, low corrosion rate on the clay, no acid substances in a system, low corrosivity on equipment and a pipe column and the like, and is simple in preparation method and low in cost.
Detailed Description
The first embodiment is as follows:
the invention is applied to medium-high permeability sandstone reservoir chelating deblocking fluid (GEL-B product), which comprises the following components in percentage by weight:
the iron ion stabilizer is one or more of citric acid, isoascorbic acid and EDTA (ethylene diamine tetraacetic acid); the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
The preparation method comprises the following steps:
adding water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant into a round-bottom flask in sequence, and stirring and reacting for 4 hours under the condition of 50 ℃ water bath to obtain the blockage removing liquid product.
The product is applied to a certain well of the middle-sea oil, after the blockage removing measures, the daily gain liquid of the well is 149 formulas, the daily gain oil is 16 formulas, and the oil is accumulated to 4812 formulas till now.
Example two:
the invention is applied to medium-high permeability sandstone reservoir chelating deblocking fluid (GEL-B product), which comprises the following components in percentage by weight:
the iron ion stabilizer is one or more of citric acid, isoascorbic acid and EDTA (ethylene diamine tetraacetic acid); the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
The preparation method comprises the following steps:
adding water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant into a round-bottom flask in sequence, and stirring and reacting for 4 hours under the condition of 50 ℃ water bath to obtain the blockage removing liquid product.
The product is applied to a certain well of the middle-sea oil, and after the blockage removing measures are taken, the daily liquid increase of the well is 52, the daily oil increase is 24, and the oil increase is 1360.
Example three:
the invention is applied to medium-high permeability sandstone reservoir chelating deblocking fluid (GEL-B product), which comprises the following components in percentage by weight:
the iron ion stabilizer is one or more of citric acid, isoascorbic acid and EDTA (ethylene diamine tetraacetic acid); the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
The preparation method comprises the following steps:
adding water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant into a round-bottom flask in sequence, and stirring and reacting for 4 hours under the condition of 50 ℃ water bath to obtain the blockage removing liquid product.
The product is applied to a certain well of the middle-sea oil, and after the blockage removing measures, the daily gain liquid is 20 formulas, the daily gain oil is 22 formulas, and the oil 2419 formula is accumulated up to now.
Example four:
the invention is applied to medium-high permeability sandstone reservoir chelating deblocking fluid (GEL-B product), which comprises the following components in percentage by weight:
the iron ion stabilizer is one or more of citric acid, isoascorbic acid and EDTA (ethylene diamine tetraacetic acid); the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
The preparation method comprises the following steps:
adding water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant into a round-bottom flask in sequence, and stirring and reacting for 4 hours under the condition of 50 ℃ water bath to obtain the blockage removing liquid product.
The product is applied to a certain well of the middle-sea oil, after the blockage removing measures, the daily gain liquid of the well is 49.5, the daily gain oil is 22.6, and the cumulative oil is 2100.
Example five:
the invention is applied to medium-high permeability sandstone reservoir chelating deblocking fluid (GEL-A product), which comprises the following components in percentage by weight:
the iron ion stabilizer is one or more of citric acid, isoascorbic acid and EDTA (ethylene diamine tetraacetic acid); the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
The preparation method comprises the following steps:
adding water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant into a round-bottom flask in sequence, and stirring and reacting for 4 hours under the condition of 50 ℃ water bath to obtain the blockage removing liquid product.
The invention is applied to medium-high permeability sandstone reservoir chelating deblocking fluid (GEL-B product), which comprises the following components in percentage by weight:
the iron ion stabilizer is one or more of citric acid, isoascorbic acid and EDTA (ethylene diamine tetraacetic acid); the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer adopts cationic quaternary ammonium salt; the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
The preparation method comprises the following steps:
adding water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant into a round-bottom flask in sequence, and stirring and reacting for 4 hours under the condition of 50 ℃ water bath to obtain the blockage removing liquid product.
The GEL-A, GEL-B product is commonly applied to a certain well of medium-sea oil, and after the blockage removal measure, the daily gain of 218 parts and the daily gain of 32.5 parts of oil of the well are accumulated to 8100 parts of oil.
And (3) construction effect statistics:
performance test result of chelate-attached blockage removal system
1. Corrosion rate test
1g of the dried bentonite is taken and put into the chelation deblocking liquid of the first to fifth embodiments respectively, the volume of the chelation deblocking liquid is 50mL, the reaction temperature is 65 ℃, and the reaction time is 4 h. And filtering and drying the mixture to constant weight after reaction, weighing the weight of the residual bentonite, and calculating the corrosion rate. The results are shown in Table 1.
TABLE 1 Corrosion Rate test results
| Corrosion rate (%) | |
| Example one | 22.6 |
| Example two | 22.5 |
| EXAMPLE III | 23.8 |
| Example four | 23.5 |
| EXAMPLE five | 23.8 |
Compared with earth acid, the clay corrosion capacity of the chelating plugging removal liquid is lower, excessive corrosion of a medium-high permeable layer is avoided, and a rock framework is not damaged, so that formation sand production is caused.
2. Corrosion inhibition performance test
The corrosion inhibition performance of the chelating and deblocking liquid of the first to fifth embodiments is evaluated according to a corrosion inhibitor performance test method and evaluation indexes for acidification of an industry standard SY/T5405-1996, and the test temperature is 65 ℃ and 90 ℃. The evaluation results are shown in Table 2.
TABLE 2 Corrosion Rate test results
The chelating deblocking liquid has corrosion rate far lower than the industry standard (injecting 90 ℃, 15% hydrochloric acid, the first grade industry standard is (3-4) g/(m) under the condition of stratum temperature2H); 7.5 percent hydrochloric acid and 1.5 percent HF at 90 ℃, and the first-level industry standard is (2-3) g/(m)2H). Therefore, the system can adopt the conventional methodAnd (5) pump injection equipment construction.
3. Secondary precipitation control Capacity test
The reaction raffinate of the first to fifth chelating deblocking fluids of examples and the rock debris was adjusted to pH 7 with 5 wt% aqueous sodium carbonate, and the phenomenon is shown in Table 3.
TABLE 3 influence of pH change on reaction residue
| Adjusting the pH to 7 | |
| Example one raffinate | No precipitation |
| Example II raffinate | No precipitation |
| Example III raffinate | No precipitation |
| Example four residue liquid | No precipitation |
| Example five raffinate | No precipitation |
The chelating deblocking liquid has stable residual liquid performance, changes pH environment, does not generate secondary precipitation, and can be used for well shut-in reaction in a reservoir for a long time.
The embodiments of the present invention have been described in detail, but the description is only a preferred example of the present invention, and is not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the design of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (2)
1. The chelation blocking remover applied to the medium-high permeability sandstone reservoir is characterized by comprising the following components in percentage by weight: 18-25 parts of DOTA derivative, 4-10 parts of iron ion stabilizer, 5-15 parts of surfactant, 4-10 parts of clay stabilizer, 5-12 parts of assistant and the balance of water; the iron ion stabilizer is one or a mixture of citric acid, isoascorbic acid and EDTA; the surfactant is a mixture of a fluorocarbon surfactant and polyoxyethylene polyoxypropylene octadecanol ether; the clay stabilizer is cation quaternary ammonium salt, and the auxiliary agent is a mixture of polyvinyl alcohol and low-carbon alcohol ether.
2. The preparation method of the chelation deblocking liquid applied to the medium-high permeability sandstone reservoir is characterized in that water, an auxiliary agent, a DOTA derivative, an iron ion stabilizer, a clay stabilizer and a surfactant are sequentially added according to the proportion of the components of the chelation deblocking liquid applied to the medium-high permeability sandstone reservoir in claim 1, and the components are compounded after being uniformly mixed; the preparation temperature is 45-50 ℃, and the preparation time is 3-4 h.
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| CN114991738B (en) * | 2021-03-01 | 2024-03-26 | 中国石油天然气股份有限公司 | Sandstone reservoir composite reconstruction method |
| CN113105880B (en) * | 2021-03-26 | 2022-09-06 | 中海油田服务股份有限公司 | Blockage removal system and application thereof |
| CN113174243B (en) * | 2021-05-07 | 2022-07-01 | 河北峻极化工科技有限公司 | Self-selection flow-dividing blockage removal system for improving interlayer contradiction of sandstone reservoir and application method thereof |
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