CN112048292B - Blockage removing liquid and application thereof - Google Patents
Blockage removing liquid and application thereof Download PDFInfo
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- CN112048292B CN112048292B CN202010824649.0A CN202010824649A CN112048292B CN 112048292 B CN112048292 B CN 112048292B CN 202010824649 A CN202010824649 A CN 202010824649A CN 112048292 B CN112048292 B CN 112048292B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
Abstract
The blockage removing liquid comprises the following components in percentage by weight: 10 to 30 percent of acid, 5 to 15 percent of organic cleaning agent, 1 to 3 percent of corrosion inhibitor and the balance of water. The preparation method of the blockage removing liquid comprises the steps of adding water, the corrosion inhibitor, the acid and the organic cleaning agent in sequence according to the proportion of each component of the blockage removing liquid, mixing uniformly and compounding. The plugging removal liquid can be used for removing plugging of an oil field sewage reinjection well, has strong corrosion capacity on inorganic scale, clay minerals, bacterial metabolites and solid suspended matters, has continuous cleaning capacity on heavy components in crude oil, can effectively remove the plugging of the sewage reinjection well caused by one or more factors, and has low corrosion rate on equipment and a pipe column, good compatibility, stability and safety.
Description
Technical Field
The present invention relates to petroleum exploitation technology, and is especially one kind of block eliminating liquid for sewage refilling well and its preparation process.
Background
Because the oil field reinjection sewage contains crude oil, solid suspended matters, bacterial metabolites, clay minerals and other components, and interacts with the high mineralization in produced liquid, complex scales with complex structures are formed in blastholes, sieve pipes and near-wellbore zones through physical and chemical reactions such as physical adsorption/crosslinking and the like, and various components are repeatedly wrapped and continuously grow along with the water injection process, so that the suction capacity of the reinjection well is greatly reduced.
The conventional acid system has limited blockage removing effect on the blockage, and the complex scale with complex components and structures is difficult to remove. Aiming at the blockage under the complex condition, the problem to be solved in the field is how to design a blockage removing liquid which can continuously strip crude oil and dissolve solid suspended matters, inorganic scale, bacterial metabolites and clay minerals and a preparation method thereof.
Disclosure of Invention
The application provides a blockage removing liquid applied to an oilfield sewage reinjection well and a preparation method thereof, the blockage removing liquid has strong corrosion capacity on inorganic scale, clay minerals, bacterial metabolites and solid suspended matters, has continuous cleaning capacity on heavy components in crude oil, can effectively remove blockage of the sewage reinjection well caused by one or more factors, and is low in corrosion rate on equipment and a pipe column, and good in stability and safety.
The application provides a blockage relieving liquid which comprises the following components: 10 to 30% acid, 5 to 15% organic cleaning agent, 1 to 3% corrosion inhibitor, and the balance water.
In the unblocking fluid provided herein, the acid is an aqueous acid solution;
in the deblocking liquid provided by the present application, optionally, the aqueous acid solution is selected from any one or more of a hydrochloric acid solution, a hydrofluoric acid solution, a fluoboric acid solution, a nitric acid solution, and a hydroxyethylidene diphosphonic acid solution;
in the deblocking liquid provided herein, optionally, the acid consists of the hydrochloric acid solution, the hydrofluoric acid solution, the fluoroboric acid solution, the nitric acid solution, and the hydroxyethylidene diphosphonic acid solution;
in the unblocking fluid provided herein, optionally, the concentration of the aqueous acid solution is 10wt.% to 30wt.%;
in the deblocking liquid provided herein, optionally, the hydrochloric acid solution is a hydrochloric acid solution having a concentration of 5wt.% to 16wt.%, the hydrofluoric acid solution is a hydrofluoric acid solution having a concentration of 1wt.% to 5wt.%, the fluoroboric acid solution is a fluoroboric acid solution having a concentration of 0wt.% to 5wt.%, the nitric acid solution is a nitric acid solution having a concentration of 1wt.% to 5wt.%, and the hydroxyethylidene diphosphonic acid solution is a hydroxyethylidene diphosphonic acid solution having a concentration of 5wt.% to 10 wt.%.
In the unblocking liquid provided by the application, the organic cleaning agent is a mixed liquid containing water, and the amount of the water accounts for 65wt.% to 85wt.% of the organic cleaning agent;
in the blockage removing liquid provided by the application, the organic cleaning agent comprises any one or more than two of solvent oil, polyethylene glycol, low-carbon alcohol ether and hexadecyl trimethyl ammonium chloride;
in the unblocking liquid provided by the present application, optionally, the organic cleaning agent is composed of the solvent oil, the polyethylene glycol, the low carbon alcohol ether, and the hexadecyltrimethylammonium chloride;
in the unblocking liquid provided by the present application, optionally, a weight ratio of the solvent oil, the polyethylene glycol, the lower alcohol ether, and the hexadecyltrimethylammonium chloride is (3 to 10): (8 to 15): (5 to 10): (1 to 3).
In the blockage removing liquid provided by the application, the solvent oil is selected from any one or more than two of S-100, S-150 and S-200;
in the unblocking liquid provided by the present application, optionally, the lower alcohol ether is selected from any one or more than two of methanol, ethanol, dimethyl ether, diethyl ether, methyl ethyl ether and ethylene glycol butyl ether.
In the plugging removal liquid provided by the application, the polyethylene glycol is selected from any one or more than two of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600 and polyethylene glycol 800.
In the unblocking liquid provided by the application, the corrosion inhibitor is a mixed liquid containing water, and the amount of the water accounts for 50wt.% to 75wt.% of the corrosion inhibitor;
in the unblocking liquid provided by the application, the corrosion inhibitor comprises any one or more than two of imidazoline derivatives, propiolic alcohol and polyoxyethylene alkylphenol ethers;
in the deblocking liquid provided herein, optionally, the corrosion inhibitor consists of the imidazoline derivative, the propiolic alcohol, and the polyoxyethylene alkylphenol ether;
in the interpretations provided herein, too, optionally, the weight ratio of the imidazoline derivative, the propiolic alcohol, and the polyoxyethylene alkylphenol ether is (15 to 25): (8 to 15): (5 to 10).
In the plugging removal liquid provided by the application, the imidazoline derivative is any one or more of oleoyl hydroxyethyl imidazoline, alkyl imidazoline, phosphate ester imidazoline and thiourea methyl imidazoline;
in the unblocking liquid provided by the application, optionally, the polyoxyethylene alkylphenol ether is selected from any one or more than two of OP-10, OP-13 and OP-15.
In the plugging removal liquid provided by the application, the preparation method of the plugging removal liquid is that water, a corrosion inhibitor, acid and an organic cleaning agent are sequentially added according to the proportion of each component of the plugging removal liquid, and the plugging removal liquid is prepared by uniformly mixing and compounding.
On the other hand, the application provides the application of the blockage removing liquid, the blockage removing liquid is used for removing blockage of the sewage reinjection well, and the volume ratio of the blockage removing liquid to the reinjected sewage is (0.5-1.0): (0.5-2.5).
In the application of the plugging removal solution provided by the application, the sewage is oil field polymer-containing sewage;
in the application of the plugging removal solution provided by the application, the volume ratio of the plugging removal solution to the oilfield polymer-containing sewage is (1-2) to (1-3);
in the application of the plugging removal fluid provided by the application, optionally, the volume ratio of the plugging removal fluid to the oilfield polymer-containing sewage is 1.
The plugging removing liquid applied to the oilfield sewage reinjection well and the preparation method thereof are widely applied to the oilfield sewage reinjection well plugging removing, have strong corrosion capacity on inorganic scale, clay minerals, bacterial metabolites and solid suspended matters, have continuous cleaning capacity on heavy components in crude oil, can effectively remove the blockage of the oilfield sewage reinjection well caused by one or more factors, and simultaneously have low corrosion rate on equipment and a pipe column, good compatibility, stability and safety, simple preparation method and low cost.
Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the present application. Other advantages of the present application may be realized and attained by the invention in its aspects as described in the specification.
Drawings
The drawings are intended to provide an understanding of the present disclosure, and are to be considered as forming a part of the specification, and are to be used together with the embodiments of the present disclosure to explain the present disclosure without limiting the present disclosure.
FIG. 1 is a W1 well construction curve chart in example 1 of the present application;
FIG. 2 is a water injection curve chart of the injection amount before and after the plugging removal liquid is used in the W1 well in example 1 of the application.
FIG. 3 is a W2 well construction curve chart in example 2 of the present application;
FIG. 4 is a water injection curve chart of the injection amount before and after the plugging removal liquid is used in the W2 well in the example 2 of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the application, the preparation method is a conventional method unless otherwise specified; the starting materials used are commercially available from published sources unless otherwise specified.
The embodiment of the application provides a blockage removing liquid which comprises the following components: 10 to 30% acid, 5 to 15% organic cleaning agent, 1 to 3% corrosion inhibitor, and the balance water.
In the examples herein, the acid is an aqueous acid solution;
in the embodiment of the present application, optionally, the aqueous acid solution is selected from any one or more of a hydrochloric acid solution, a hydrofluoric acid solution, a fluoroboric acid solution, a nitric acid solution, and a hydroxyethylidene diphosphonic acid solution;
in embodiments herein, optionally, the acid consists of the hydrochloric acid solution, the hydrofluoric acid solution, the fluoroboric acid solution, the nitric acid solution, and the hydroxyethylidene diphosphonic acid solution;
in embodiments herein, optionally, the concentration of the aqueous acid solution is 10wt.% to 30wt.%;
in the present embodiment, optionally, the hydrochloric acid solution is a hydrochloric acid solution with a concentration of 5wt.% to 16wt.%, the hydrofluoric acid solution is a hydrofluoric acid solution with a concentration of 1wt.% to 5wt.%, the fluoroboric acid solution is a fluoroboric acid solution with a concentration of 0wt.% to 5wt.%, the nitric acid solution is a nitric acid solution with a concentration of 1wt.% to 5wt.%, and the hydroxyethylidene diphosphonic acid solution is a hydroxyethylidene diphosphonic acid solution with a concentration of 5wt.% to 10 wt.%.
In the embodiment of the application, the organic cleaning agent is a mixed liquid containing water, and the amount of the water accounts for 65wt.% to 85wt.% of the organic cleaning agent;
in the embodiment of the application, the organic cleaning agent comprises any one or more than two of solvent oil, polyethylene glycol, low-carbon alcohol ether and hexadecyl trimethyl ammonium chloride;
in the embodiment of the present application, optionally, the organic cleaning agent is composed of the solvent oil, the polyethylene glycol, the lower alcohol ether and the cetyltrimethylammonium chloride;
in embodiments herein, optionally, the weight ratio of the mineral spirit, the polyethylene glycol, the lower alcohol ether, and the cetyltrimethylammonium chloride is (3 to 10): (8 to 15): (5 to 10): (1 to 3).
In the embodiment of the application, the solvent oil is selected from any one or more than two of S-100, S-150 and S-200;
in the embodiments of the present application, optionally, the lower alcohol ether is selected from any one or more of methanol, ethanol, dimethyl ether, diethyl ether, methyl ethyl ether and ethylene glycol butyl ether.
In the embodiment of the present application, the polyethylene glycol is selected from any one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600 and polyethylene glycol 800.
In the embodiment of the application, the corrosion inhibitor is a mixed liquid containing water, and the water accounts for 50wt.% to 75wt.% of the corrosion inhibitor;
in the embodiment, the corrosion inhibitor comprises any one or more of imidazoline derivatives, propiolic alcohol and polyoxyethylene alkylphenol ethers;
in embodiments herein, optionally, the corrosion inhibitor consists of the imidazoline derivative, the propiolic alcohol, and the polyoxyethylene alkylphenol ether;
in embodiments herein, optionally, the weight ratio of the imidazoline derivative, the propargyl alcohol, and the polyoxyethylene alkylphenol ether is (15 to 25): (8 to 15): (5 to 10).
In the embodiments of the present application, the imidazoline derivative is any one or more of oleoyl hydroxyethyl imidazoline, alkyl imidazoline, phosphate ester imidazoline, and thiourea methyl imidazoline;
in the embodiments of the present application, optionally, the polyoxyethylene alkylphenol ether is selected from any one or two or more of OP-10, OP-13 and OP-15.
In the embodiment of the application, the preparation method of the blockage removing liquid is that water, a corrosion inhibitor, acid and an organic cleaning agent are added in sequence according to the proportion of each component of the blockage removing liquid, and the blockage removing liquid is compounded after being uniformly mixed.
On the other hand, the application of the blockage removing liquid is provided in the embodiment of the application, the blockage removing liquid is used for removing blockage of the sewage reinjection well, and the volume ratio of the blockage removing liquid to the reinjection sewage is (0.5-1.0) to (0.5-2.5).
In the examples of the present application, the wastewater is oilfield polymer-containing wastewater;
in the embodiment of the application, the volume ratio of the plugging removal liquid to the oilfield polymer-containing sewage is (1 to 2) to (1 to 3);
in the embodiment of the present application, optionally, the volume ratio of the plugging removal fluid to the oilfield polymer-containing wastewater is 1.
In embodiments of the present application, the polymer-containing wastewater is any polymer-containing wastewater produced by oil recovery in an oil field.
Example 1
The embodiment provides a plugging removal liquid for an oilfield sewage reinjection well, which comprises the following components: 20wt.% of acid, 12wt.% of organic cleaning agent and 1wt.% of corrosion inhibitor, and the balance of common fresh water.
The corrosion inhibitor used in this embodiment is a mixed solution of 20wt.% oleoyl hydroxyethyl imidazoline, 12wt.% propiolic alcohol, 10wt.% polyoxyethylene alkylphenol ether, and 58wt.% water; the used organic cleaning agent is a mixed solution consisting of 8wt.% of solvent oil S-150, 12wt.% of polyethylene glycol 200, 8wt.% of ethylene glycol butyl ether, 3wt.% of hexadecyl trimethyl ammonium chloride and 79wt.% of water; the acid used was a mixture of 16wt.% hydrochloric acid, 4wt.% hydrofluoric acid, 2wt.% nitric acid, 8wt.% hydroxyethylidene diphosphonic acid, and 68wt.% water.
The corrosion inhibitor of the embodiment is oleoyl hydroxyethyl imidazoline, propiolic alcohol and polyoxyethylene alkylphenol ether OP-10 which are purchased from Tianjin development area and span industrial trade company Limited; among the used organic cleaning agents, polyethylene glycol 200, ethylene glycol butyl ether and hexadecyl trimethyl ammonium chloride are purchased from Tianjin development area spanning trades company, ltd; the used solvent oil is S-150, purchased from Tianjin coastal Vast chemical Limited; the acid raw materials used were 31% hydrochloric acid, 40% hydrofluoric acid, 50% fluoroboric acid, 50% nitric acid and 60% hydroxyethylidene diphosphonic acid, respectively, and purchased from Tianjin development area spanning trades, inc. The water is common fresh water.
The preparation method of the blockage removing liquid comprises the following steps:
(1) Weighing 0.5 ton of corrosion inhibitor at 25 ℃, adding the corrosion inhibitor into a reaction kettle filled with 33.5 tons of water, stirring for 1 hour, and uniformly mixing;
(2) Weighing 10 tons of acid, adding into the reaction kettle while stirring, continuously adding 6 tons of organic cleaning agent after uniformly mixing, and preparing 50 tons of unblocking liquid after uniformly mixing.
W1 well is oilfield sewage reinjection well, and the required injection amount is 530m 3 D, actual injection quantity is 380m 3 And d, the oil pressure is 9.9MPa, the effective plugging removal thickness is 51.6m, and the plugging removal liquid in the embodiment 1 is mixed with the polymer-containing sewage in the oil field according to the volume ratio of 1. After the blockage is removed, the injection pressure of the well is reduced to 4.6MPa, and the injection amount reaches 530m 3 And d, the plugging removal liquid can well solve the problem of plugging of the sewage reinjection well and ensure the normal operation of oil field production and injection allocation.
As can be seen from figure 1, the construction displacement is gradually changed from 0.36m along with the injection of the plugging removal liquid 3 The min is increased to 0.96m 3 And the construction pressure is maintained at 12MPa, the injection amount of the well is increased by 1.6 times, and the effect is obvious. As can be seen from FIG. 2, after resuming the sewage injection, the well injection pressure drops from 9.9MPa to 4.6MPa, and the injection amount drops from 380m 3 Lifting/d to 530m 3 And d, the reinjection capacity is improved by 2 times.
Example 2
The embodiment provides a blockage relieving liquid for an oilfield sewage reinjection well, which comprises the following components: 18wt.% of acid, 10wt.% of organic cleaning agent and 1wt.% of corrosion inhibitor, and the balance of common fresh water.
The corrosion inhibitor used in this embodiment is a mixed solution of 16wt.% oleoyl hydroxyethyl imidazoline, 10wt.% propiolic alcohol, 10wt.% polyoxyethylene alkylphenol ether, and 64wt.% water; the used organic cleaning agent is a mixed solution consisting of 5wt.% of solvent oil S-150, 15wt.% of polyethylene glycol 200, 8wt.% of ethylene glycol butyl ether, 2wt.% of hexadecyl trimethyl ammonium chloride and 70wt.% of water; the acid used was a mixture of 12wt.% hydrochloric acid, 4wt.% hydrofluoric acid, 3wt.% nitric acid, 8wt.% hydroxyethylidene diphosphonic acid, and 73wt.% water.
The sources of the raw materials in this example were the same as those in example 1. The water is ordinary fresh water.
The preparation method of the blockage removing liquid comprises the following steps:
(1) Weighing 0.6 ton of corrosion inhibitor at 25 ℃, adding the corrosion inhibitor into a reaction kettle filled with 42.6 ton of water, stirring for 1 hour and uniformly mixing;
(2) Weighing 10.8 tons of acid, adding into the reaction kettle while stirring, continuously adding 6 tons of organic cleaning agent after uniformly mixing, and preparing 60 tons of unblocking liquid after uniformly mixing.
The W2 well is an oilfield sewage reinjection well and requires 650m of injection allocation quantity 3 D, actual injection quantity is 320m 3 D, the oil pressure is 4.6MPa, the effective unblocking thickness is 105m, and the injection allocation requirement cannot be met under the injection pressure limited by 5MPa, the unblocking liquid of the embodiment 2 is mixed with the polymer-containing sewage of the oil field according to the volume ratio of 1. After the blockage is removed, the injection pressure of the well is reduced to 3.9MPa, and the injection amount reaches 650m 3 And d, the plugging removal liquid can well solve the problem of plugging of the sewage reinjection well and ensure the normal operation of oil field production and injection allocation.
As can be seen from figure 3, with the injection of the unblocking liquid, the discharge capacity reaches 2.08m 3 After min, the injection pressure is reduced from 14MPa to 12MPa, and the injection capacity is improved. As can be seen from FIG. 4, the sewage injection amount after the blockage removal is 330m 3 Lifting d to 670m 3 And d, the injection pressure is reduced from 4.7MPa to 4MPa, and the injection capacity is improved by 1.4 times.
Example 3
The embodiment provides a blockage relieving liquid for an oilfield sewage reinjection well, which comprises the following components: 20wt.% of acid, 10wt.% of organic cleaning solution and 1wt.% of corrosion inhibitor, and the balance of common fresh water.
The corrosion inhibitor used in this embodiment is a mixed solution of 22wt.% oleoyl hydroxyethyl imidazoline, 10wt.% propiolic alcohol, 8wt.% polyoxyethylene alkylphenol ether, and 60wt.% water; the used organic cleaning agent is a mixed solution consisting of 6wt.% of solvent oil S-150, 14wt.% of polyethylene glycol 200, 6wt.% of ethylene glycol butyl ether, 2wt.% of hexadecyl trimethyl ammonium chloride and 72wt.% of water; the acid used was a mixture of 15wt.% hydrochloric acid, 1wt.% hydrofluoric acid, 4wt.% nitric acid, 8wt.% hydroxyethylidene diphosphonic acid, and 72wt.% water.
The sources of the raw materials in this example were the same as those in example 1. The water is ordinary fresh water.
The water is common fresh water.
The preparation method of the blockage removing liquid provided by the embodiment 3 comprises the following steps:
adding 1g of corrosion inhibitor into 71g of fresh water at room temperature, stirring uniformly, then slowly adding 20g of acid and 10g of organic cleaning solution, and stirring uniformly to obtain the plugging removing solution.
The deblocking solution prepared in example 3 was used for deblocking, and the procedure was as follows:
adding 2g of oilfield blockage into 50g of blockage removing liquid, standing in a water bath at 60 ℃ for 4 hours, filtering the mixed liquid after reaction, drying the filter paper in a drying oven at 90 ℃ for 4 hours, taking out and weighing the mass. The final calculated erosion rate was 86%.
The plugging removal liquid prepared in example 3 is used for corrosion rate test, the test method is carried out according to a static method in SY/T5405-1996 Corrosion inhibitor Performance test method for acidification and evaluation index in the China Petroleum industry Standard, the test temperature is 60 ℃, and the reaction time is 4 hours. The final measured corrosion rate was 2.18 g/(m) 2 .h)。
Comparative example 1
This comparative example 1 comprises the following components: 18wt.% of acid, 1wt.% of corrosion inhibitor and the balance of common fresh water.
The corrosion inhibitor used in this comparative example is exactly the same as in example 1; the acid used in this comparative example was exactly the same as in example 1.
The preparation method of the plugging removal liquid provided by the comparative example 1 is as follows:
adding 10g of corrosion inhibitor into 810g of fresh water at room temperature, uniformly stirring, slowly adding 180g of acid, and uniformly stirring to prepare the plugging removing liquid.
The plugging removal liquid prepared in the comparative example 1 is used for plugging removal, and the steps are as follows:
adding 2g of oilfield blockage into 50g of blockage removing liquid, standing in a water bath at 60 ℃ for 4 hours, filtering the mixed liquid after reaction, drying the filter paper in a drying oven at 90 ℃ for 4 hours, taking out and weighing the mass. The final calculated erosion rate was 16%.
The plugging removal liquid prepared in the comparative example 1 is adopted to carry out corrosion rate test, the test method is carried out according to a static method in SY/T5405-1996 corrosion inhibitor performance test method for acidification and evaluation index in the China Petroleum industry standard, the test temperature is 60 ℃, and the reaction time is 4 hours. The final measured corrosion rate was 2.20 g/(m) 2 .h)。
Comparative example 2
This comparative example 2 comprises the following components: 10wt.% of organic cleaning agent and 1wt.% of corrosion inhibitor, and the balance of common fresh water.
The organic cleaning agent used in this comparative example was exactly the same as in example 1; the corrosion inhibitor used in this comparative example was exactly the same as in example 1.
The preparation method of the plugging removal liquid provided by the comparative example 2 is as follows:
at room temperature, 10g of corrosion inhibitor is added into 890g of fresh water and stirred uniformly, and then 100g of acid is slowly added and stirred uniformly to prepare the plugging removing liquid.
The plugging removal liquid prepared in the comparative example 2 is used for removing plugging, and the steps are as follows:
adding 2g of oilfield blockage into 50g of blockage removing liquid, standing in a water bath at 60 ℃ for 4 hours, filtering the mixed liquid after reaction, drying the filter paper in a drying oven at 90 ℃ for 4 hours, taking out and weighing the mass. The final calculated erosion rate was 12%.
The plugging removal liquid prepared in the comparative example 2 is used for corrosion rate test, the test method is carried out according to a static method in SY/T5405-1996 Corrosion inhibitor Performance test method for acidification and evaluation index in the China Petroleum industry Standard, the test temperature is 60 ℃, and the reaction time is 4 hours. Finally, the corrosion rate is measuredThe ratio was 0.14 g/(m) 2 .h)。
Comparative example 3
This comparative example 3 comprises the following components: 18wt.% of acid, 10wt.% of organic cleaning agent and the balance of common fresh water.
The organic cleaning agent used in this comparative example was exactly the same as in example 1; the comparative example used exactly the same acid as in example 1.
The preparation method of the plugging removal liquid provided by the comparative example 3 is as follows:
adding 100g of organic cleaning agent into 720g of fresh water at room temperature, stirring uniformly, then slowly adding 180g of acid, and stirring uniformly to obtain the plugging removing liquid.
The blockage removing liquid prepared in the comparative example 3 is adopted for blockage removal, and the steps are as follows:
adding 2g of oilfield blockage into 50g of blockage removing liquid, placing the blockage removing liquid in a water bath at 60 ℃ for standing for 4 hours, filtering the mixed liquid after reaction, placing filter paper in a drying oven at 90 ℃ for drying for 4 hours, taking out the filter paper, and weighing the mass. The final calculated erosion rate was 87%.
The plugging removal liquid prepared in the comparative example 3 is used for corrosion rate test, the test method is carried out according to a static method in SY/T5405-1996 Corrosion inhibitor Performance test method for acidification and evaluation index in the China Petroleum industry Standard, the test temperature is 60 ℃, and the reaction time is 4 hours. The final measured corrosion rate was 34.80 g/(m) 2 .h)。
Comparative example 4
Comparative example 4 has the following components: 12wt.% hydrochloric acid, 3wt.% hydrofluoric acid, 1wt.% corrosion inhibitor, and the balance of common fresh water.
The corrosion inhibitor used in this comparative example was identical to the corrosion inhibitor used in example 1; the hydrofluoric acid used was industrial grade 40% hydrofluoric acid; the hydrochloric acid used was technical grade 31% hydrochloric acid.
The preparation method of the plugging removal liquid provided by the comparative example 4 is as follows:
at room temperature, 10g of corrosion inhibitor is added into 528g of fresh water and stirred uniformly, and then 387g of 31% hydrochloric acid and 75g of 40% hydrofluoric acid are slowly added and stirred uniformly to prepare the unblocking liquid.
The plugging removal liquid prepared by the comparative example 4 is used for removing plugging, and the steps are as follows:
adding 2g of oilfield blockage into 50g of blockage removing liquid, standing in a water bath at 60 ℃ for 4 hours, filtering the mixed liquid after reaction, drying the filter paper in a drying oven at 90 ℃ for 4 hours, taking out and weighing the mass. The final calculated erosion rate was 18%.
The plugging removal liquid prepared in the comparative example 4 is adopted to carry out corrosion rate test, the test method is carried out according to a static method in SY/T5405-1996 corrosion inhibitor performance test method for acidification and evaluation index in the China Petroleum industry standard, the test temperature is 60 ℃, and the reaction time is 4 hours. The final measured corrosion rate was 1.25 g/(m) 2 .h)。
Unblocking performance test of unblocking liquid
(1) And (3) testing the rock debris corrosion rate: accurately weighing 2g of rock debris into a plastic reaction bottle, adding 40mL of blockage removing liquid, reacting for 4 hours, weighing, and calculating the corrosion rate, wherein the corrosion rate result is shown in Table 1. The plugging removal liquid used was the plugging removal liquid prepared in example 1 of the present application and 15wt.% hydrochloric acid and earth acid (3 wt.% hydrofluoric acid +12wt.% hydrochloric acid).
TABLE 1 results of the Corrosion test
(2) Solid suspension corrosion test: the particle size distribution of suspended solids in the sewage before and after the treatment of the plugging removal liquid and the earth acid in example 1 was respectively tested by using a laser particle sizer Mastersizer 3000, and the test results are shown in table 2. The plugging removal liquid used was the plugging removal liquid prepared in example 1 of the present application and hydrochloric acid (3 wt.% hydrofluoric acid +12wt.% hydrochloric acid).
TABLE 2 median particle size test results for suspended solids
| Unblocking liquid of example 1 | Earth acid | Waste water | |
| Particle size distribution μm | <1 | <10 | <1000 |
(3) Testing stability and corrosion rate: the corrosion inhibition performance of the plugging removal solution in example 1 is evaluated according to a corrosion inhibitor performance test method and evaluation indexes for acidification of an industrial standard SY/T5405-1996, wherein the test temperature is 60 ℃, and the reaction time is 4 hours. The test tests the corrosion rate of the plugging removal liquid when the plugging removal liquid is kept stand for 1 hour, 12 hours and 60 hours.
The evaluation results are shown in Table 3.
TABLE 3 Corrosion Rate test results
| Standing for 1h | Standing for 12h | Standing for 60h | |
| Appearance of the product | Clear and transparent | Clear and transparent | Clear and transparent |
| Corrosion rate g/(m) 2 ·h) | 2.32 | 2.24 | 2.13 |
The plugging removing liquid applied to the oilfield sewage reinjection well and the preparation method thereof are widely applied to the oilfield sewage reinjection well plugging removing, have strong corrosion capacity on inorganic scale, clay minerals, bacterial metabolites and solid suspended matters, have continuous cleaning capacity on heavy components in crude oil, can effectively remove the blockage of the oilfield sewage reinjection well caused by one or more factors, and simultaneously have low corrosion rate on equipment and a pipe column, good compatibility, stability and safety, simple preparation method and low cost.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (14)
1. The application of the blockage removing liquid is characterized in that the blockage removing liquid is used for removing blockage of a sewage reinjection well, and the volume ratio of the blockage removing liquid to reinjected sewage is (0.5-1.0) to (0.5-2.5);
the blockage removing liquid consists of the following components: 10 to 30% acid, 5 to 15% organic cleaning agent, 1 to 3% corrosion inhibitor, and the balance water;
the acid is an aqueous acid solution; the acid is composed of a hydrochloric acid solution, a hydrofluoric acid solution, a fluoboric acid solution, a nitric acid solution and a hydroxyethylidene diphosphonic acid solution;
the weight ratio of the hydrochloric acid solution, the hydrofluoric acid solution, the fluoroboric acid solution, the nitric acid solution and the hydroxyethylidene diphosphonic acid solution is (5-16): 1-5): 0-5: (1-5): 5-10);
the organic cleaning agent consists of solvent oil, polyethylene glycol, low-carbon alcohol ether and hexadecyl trimethyl ammonium chloride;
the weight ratio of the solvent oil, the polyethylene glycol, the low-carbon alcohol ether and the hexadecyl trimethyl ammonium chloride is (3-10): (8-15): (5-10): (1-3);
the low-carbon alcohol ether is selected from any one or more than two of dimethyl ether, diethyl ether, methyl ethyl ether and ethylene glycol butyl ether.
2. Use according to claim 1, wherein the aqueous acid solution has a concentration of 10 to 30wt.%.
3. Use according to claim 1, wherein the hydrochloric acid solution is a hydrochloric acid solution with a concentration of 5 to 16wt.%, the hydrofluoric acid solution is a hydrofluoric acid solution with a concentration of 1 to 5wt.%, the fluoroboric acid solution is a fluoroboric acid solution with a concentration of 0 to 5wt.%, the nitric acid solution is a nitric acid solution with a concentration of 1 to 5wt.%, the hydroxyethylidene diphosphonic acid solution is a hydroxyethylidene diphosphonic acid solution with a concentration of 5 to 10 wt.%.
4. The use according to claim 1, wherein the organic cleaning agent is a mixed liquor comprising water, and the amount of the water is 65wt.% to 85wt.% of the organic cleaning agent.
5. The use according to claim 1, wherein the solvent oil is selected from any one or more of S-100, S-150 and S-200.
6. The use according to claim 1, wherein the polyethylene glycol is selected from any one or more of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600 and polyethylene glycol 800.
7. The use according to claim 1, wherein the corrosion inhibitor is a mixed liquor comprising water in an amount of 50 to 75wt.% of the corrosion inhibitor;
the corrosion inhibitor comprises any one or more than two of imidazoline derivatives, propiolic alcohol and polyoxyethylene alkylphenol ethers.
8. The use according to claim 7, wherein the corrosion inhibitor consists of the imidazoline derivative, the propargyl alcohol, and the polyoxyethylene alkylphenol ether.
9. The use of claim 8, wherein the weight ratio of the imidazoline derivative, the propargyl alcohol, and the polyoxyethylene alkylphenol ether is (15 to 25): (8 to 15): (5 to 10).
10. The use according to claim 9, wherein the imidazoline derivative is any one or more of oleoyl hydroxyethyl imidazoline, alkyl imidazoline, phosphate imidazoline, and thiourea methyl imidazoline.
11. The use according to claim 8 or 9, wherein the polyoxyethylene alkylphenol ether is selected from any one or two or more of OP-10, OP-13 and OP-15.
12. Use of the unplugging fluid of any of claims 1-9, wherein the wastewater is oilfield polymer-containing wastewater.
13. The use of the deblocking fluid of any of claims 1 to 9, wherein the volume ratio of the deblocking fluid to oilfield polymer-containing wastewater is (1 to 2): (1 to 3).
14. The use of the deblocking fluid of any one of claims 1 to 9, wherein the deblocking fluid is formulated at a 1.
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