Geothermal drilling unblocking liquid and unblocking construction process

Abstract

The invention belongs to the technical field of geothermal drilling unblocking liquid, and particularly relates to geothermal drilling unblocking liquid and an unblocking construction process. The geothermal drilling plugging removal liquid comprises a first component and a second component, the first component is prepared from the following components in percentage by mass: 80%-83% of compound enzyme liquid, 0.1%-0.3% of a first synergist, 1.2%-1.5% of a stabilizer, 1%-1.5% of a corrosion inhibitor and the balance of deionized water; the first synergist is benzenesulfonic acid or a derivative thereof; the second component is prepared from the following components in percentage by mass: 3%-5% of inorganic acid, 0.3%-0.5% of a second synergist, 1.2%-1.5% of a stabilizer and the balance of deionized water; the second synergist is a pyrophosphate. The invention provides a geothermal well drilling plug removal liquid and a plug removal construction process, which are used for improving the plug removal rate, enabling fluid in geothermal well drilling to quickly recover flowing, avoiding resource waste and saving energy.

Description

Technical Field

[0001] The invention belongs to the technical field of geothermal drilling plugging-removing fluid, and in particular relates to a geothermal drilling plugging-removing fluid and a plugging-removing construction process. Background Art

[0002] Geothermal drilling, as the name implies, is drilling for the purpose of utilizing geothermal energy. With the different depths of geothermal drilling, the internal environmental temperature is also divided into low temperature, medium temperature and high temperature, among which the high temperature range can reach 90℃~150℃, or even higher. Geothermal energy can be used for many purposes such as hot springs, power generation, heating, etc.

[0003] The main reasons for blockage in geothermal drilling include physical, chemical and biological reasons. The physical reason refers to the blockage of suspended matter, which accumulates in the well and hinders the flow of fluid; the chemical reason refers to the precipitation of minerals such as calcium salts, which can block the wellbore; the biological reason is the result of the metabolic activities of microorganisms such as iron bacteria, which produce precipitates or sticky substances, causing the wellbore to be blocked.

[0004] When geothermal drilling is blocked, the flow of fluid is hindered, resulting in the inability to smoothly utilize geothermal energy. Therefore, unblocking fluids are widely developed. For example, Chinese patent CN110540832A discloses an unblocking fluid for plugging slurry and its preparation method, the unblocking fluid comprises the following components in mass percentage: unblocking agent 5.0% to 8.0%, corrosion inhibitor 1.0% to 2.0%, corrosion inhibitor 0.2% to 0.5%, iron ion stabilizer 1.0% to 2.0%, hydrochloric acid, and the balance is water; wherein the mass percentage of hydrogen chloride in hydrochloric acid to the unblocking fluid is 15.0% to 20.0%; the unblocking fluid contains two groups, hydroxyl and carboxyl. For example, CN115161000A discloses a plugging remover for drilling fluid based on a composite amino acid enzymatic hydrolysate and its preparation and application method, wherein the plugging remover includes the following components calculated by mass percentage: 85.11% to 85.52% of a composite amino acid enzymatic hydrolysate, 2.13% to 2.72% of a high temperature stabilizer, 2.13% to 3.26% of a penetrant, 3.55% to 4.35% of a viscoelastic surfactant, and 7.09% to 8.15% of deionized water. These plugging removers can dissolve or degrade the blockage, allowing the fluid to flow.

[0005] When a geothermal well is clogged, the fluid cannot flow normally, which affects the utilization of geothermal energy, reduces energy efficiency, and causes waste of resources. Therefore, a deblocking fluid is needed to quickly deblock the well. However, the deblocking rate of the existing deblocking fluid still needs to be improved. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a geothermal drilling unblocking fluid and unblocking construction process, which are used to increase the unblocking rate, so that when the same unblocking effect is achieved, the time consumed is short, resource waste is avoided, and energy is saved.

[0007] The object of the present invention is to provide a geothermal drilling plugging removal fluid, comprising a first component and a second component;

[0008] The first component is made of the following components in percentage by mass:

[0009] Compound enzyme solution 80%-83%, first synergist 0.1%-0.3%, stabilizer 1.2%-1.5%, corrosion inhibitor 1%-1.5%, deionized water to make up 100%;

[0010] The compound enzyme solution is a mixture of acid protease, cellulase, pectinase and deionized water;

[0011] The first synergist is benzenesulfonic acid or its derivatives;

[0012] The corrosion inhibitor is Mannich base;

[0013] The second component is made of the following components in percentage by weight:

[0014] Inorganic acid 3%~5%, second synergist 0.3%~0.5%, stabilizer 1.2%~1.5%, deionized water to make up 100%;

[0015] The second synergist is pyrophosphate;

[0016] In the first component and the second component, the stabilizer is the same, which is tetradecyl trimethyl ammonium salicylate and hexadecyl trimethyl ammonium salicylate. The function of the stabilizer is to stabilize the system of the first component and the second component. The volume ratio of the first component to the second component is 1:1.

[0017] Preferably, in the composite enzyme solution, the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100.

[0018] Preferably, the first synergist is benzenesulfonic acid.

[0019] Preferably, the pyrophosphate is sodium pyrophosphate.

[0020] Preferably, the inorganic acid is hydrochloric acid.

[0021] Preferably, the geothermal drilling plugging-removing fluid is prepared according to the following method:

[0022] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, mix them evenly, and obtain the first component;

[0023] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0024] The first component and the second component are stored separately for later use.

[0025] The present invention also provides a geothermal drilling unblocking construction process. When a geothermal drilling blockage occurs, the first component and the second component are alternately injected into the borehole in a volume ratio of 1:1; after each injection of the first component or the second component, the process is left to stand for 4 to 6 hours, and the front liquid is discharged before the rear liquid is injected; the process is alternately cycled for 2 or more times until the unblocking is completed, and the geothermal drilling unblocking liquid is discharged.

[0026] Preferably, let stand for 5 hours.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In the present invention, the composite enzyme liquid of the first component is used to degrade microbial metabolites, proteins, cellulose, and colloid substances; for example, the composite enzyme liquid is a mixture of acidic protease, cellulase, pectinase and deionized water in a mass ratio of 1:1:1:100; the composite enzyme liquid is a biodegradation method, which is safe and suitable for acidic conditions, and can be used in conjunction with the inorganic acid of the second component; the first synergist is used to increase the speed of the composite enzyme liquid in degrading microbial metabolites; for example, the first synergist is benzenesulfonic acid or its derivatives, which has certain acidity and chemical activity and catalyzes the reaction; the corrosion inhibitor Mannich base has an anti-corrosion effect.

[0029] In the present invention, the inorganic acid of the second component is used to dissolve minerals; for example, hydrochloric acid is used to dissolve calcium minerals and alkaline substances. The acidic condition is a polar condition and can also destroy the viscosity of viscous substances. Inorganic acids such as hydrochloric acid have a small molecular weight and are small molecule acids with strong penetration ability. They can quickly penetrate into the blockage and degrade or dissolve the blockage. The second enhancer is used to adjust the polarity of the inorganic acid and enhance the contact effect between the inorganic acid and the viscous substance, so that the surface tension of the hydrophobic blockage changes and the affinity of the inorganic acid. For example, the second enhancer is sodium pyrophosphate, which has the function of softening water, can change the affinity between the blockage and the inorganic acid, and accelerate the inorganic acid unblocking rate.

[0030] In the first component and the second component, the stabilizer is the same, which is tetradecyl trimethyl ammonium salicylate and hexadecyl trimethyl ammonium salicylate. The function of the stabilizer is to stabilize the system of the first component and the second component. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1The present invention is a flowchart of the construction process of geothermal drilling plugging removal fluid. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments and drawings.

[0033] In the description of the present invention, unless otherwise specified, all reagents used are commercially available, and all methods used are conventional techniques in the art. Hydrochloric acid is commercially available concentrated hydrochloric acid.

[0034] Example 1

[0035] A geothermal drilling plugging removal fluid comprises a first component and a second component, wherein the volume ratio of the first component to the second component is 1:1;

[0036] The first component is made of the following components in percentage by mass:

[0037] Compound enzyme solution 80%, first synergist 0.1%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to 100%;

[0038] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0039] The first synergist is benzenesulfonic acid, and the corrosion inhibitor is Mannich base;

[0040] The second component is made of the following components in percentage by weight:

[0041] Inorganic acid 3%, second synergist 0.3%, stabilizer 1.2%, deionized water to make up 100%;

[0042] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0043] In the first component and the second component, the stabilizer component is the same, and the stabilizer is cetyltrimethylammonium salicylate.

[0044] The geothermal drilling plugging removal fluid is prepared according to the following method:

[0045] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, mix them evenly, and obtain the first component;

[0046] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0047] The first component and the second component are stored separately for later use.

[0048] Example 2

[0049] A geothermal drilling plugging removal fluid comprises a first component and a second component, wherein the volume ratio of the first component to the second component is 1:1;

[0050] The first component is made of the following components in percentage by mass:

[0051] Compound enzyme solution 81.5%, first synergist 0.2%, stabilizer 1.35%, corrosion inhibitor 1.35%, deionized water to 100%;

[0052] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0053] The first synergist is benzenesulfonic acid, and the corrosion inhibitor is Mannich base;

[0054] The second component is made of the following components in percentage by mass:

[0055] Inorganic acid 3%, second synergist 0.3%, stabilizer 1.2%, deionized water to make up 100%;

[0056] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0057] In the first component and the second component, the stabilizer component is the same, and the stabilizer is cetyltrimethylammonium salicylate.

[0058] The geothermal drilling plugging removal fluid is prepared according to the following method:

[0059] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, and mix them evenly to obtain the first component;

[0060] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0061] The first component and the second component are stored separately for later use.

[0062] Example 3

[0063] A geothermal drilling plugging removal fluid comprises a first component and a second component, wherein the volume ratio of the first component to the second component is 1:1;

[0064] The first component is made of the following components in percentage by mass:

[0065] Compound enzyme solution 83%, first synergist 0.3%, stabilizer 1.5%, corrosion inhibitor 1.5%, deionized water to 100%;

[0066] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0067] The first synergist is benzenesulfonic acid, and the corrosion inhibitor is Mannich base;

[0068] The second component is made of the following components in percentage by mass:

[0069] Inorganic acid 3%, second synergist 0.3%, stabilizer 1.2%, deionized water to make up 100%;

[0070] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0071] In the first component and the second component, the stabilizer component is the same, and the stabilizer is cetyltrimethylammonium salicylate.

[0072] The geothermal drilling plugging removal fluid is prepared according to the following method:

[0073] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, and mix them evenly to obtain the first component;

[0074] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0075] The first component and the second component are stored separately for later use.

[0076] Example 4

[0077] A geothermal drilling plugging removal fluid comprises a first component and a second component, wherein the volume ratio of the first component to the second component is 1:1;

[0078] The first component is made of the following components in percentage by mass:

[0079] Compound enzyme solution 80%, first synergist 0.1%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to 100%;

[0080] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0081] The first synergist is benzenesulfonic acid, and the corrosion inhibitor is Mannich base;

[0082] The second component is made of the following components in percentage by mass:

[0083] Inorganic acid 4%, second synergist 0.4%, stabilizer 1.35%, deionized water to 100%;

[0084] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0085] In the first component and the second component, the stabilizer component is the same, and the stabilizer is cetyltrimethylammonium salicylate.

[0086] The geothermal drilling plugging removal fluid is prepared according to the following method:

[0087] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, and mix them evenly to obtain the first component;

[0088] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0089] The first component and the second component are stored separately for later use.

[0090] Example 5

[0091] A geothermal drilling plugging removal fluid comprises a first component and a second component, wherein the volume ratio of the first component to the second component is 1:1;

[0092] The first component is made of the following components in percentage by mass:

[0093] Compound enzyme solution 80%, first synergist 0.1%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to 100%;

[0094] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0095] The first synergist is benzenesulfonic acid, and the corrosion inhibitor is Mannich base;

[0096] The second component is made of the following components in percentage by mass:

[0097] Inorganic acid 5%, second synergist 0.5%, stabilizer 1.5%, deionized water to make up 100%;

[0098] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0099] In the first component and the second component, the stabilizer component is the same, and the stabilizer is cetyltrimethylammonium salicylate.

[0100] The geothermal drilling plugging removal fluid is prepared according to the following method:

[0101] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, and mix them evenly to obtain the first component;

[0102] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0103] The first component and the second component are stored separately for later use.

[0104] Example 6

[0105] A geothermal drilling plugging removal fluid comprises a first component and a second component, wherein the volume ratio of the first component to the second component is 1:1;

[0106] The first component is made of the following components in percentage by mass:

[0107] Compound enzyme solution 80%, first synergist 0.1%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to 100%;

[0108] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0109] The first synergist is benzenesulfonic acid, and the corrosion inhibitor is Mannich base;

[0110] The second component is made of the following components in percentage by mass:

[0111] Inorganic acid 5%, second synergist 0.5%, stabilizer 1.5%, deionized water to make up 100%;

[0112] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0113] In the first component and the second component, the stabilizer component is the same, and the stabilizer is tetradecyltrimethylammonium salicylate.

[0114] The geothermal drilling plugging removal fluid is prepared according to the following method:

[0115] Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, and mix them evenly to obtain the first component;

[0116] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0117] The first component and the second component are stored separately for later use.

[0118] Comparative Example 1

[0119] A geothermal drilling plugging removal fluid is the first component of Example 1. The details are as follows:

[0120] The first component is made of the following components in percentage by mass:

[0121] Compound enzyme solution 80%, first synergist 0.1%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to 100%;

[0122] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0123] The first synergist is benzenesulfonic acid;

[0124] The corrosion inhibitor is Mannich base;

[0125] The stabilizer is cetyltrimethylammonium salicylate.

[0126] Preparation of the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, mix them evenly, and obtain the first component.

[0127] Comparative Example 2

[0128] A geothermal drilling plugging removal fluid, which is the second component of Example 1. The details are as follows:

[0129] The second component is made of the following components in percentage by weight:

[0130] Inorganic acid 3%, second synergist 0.3%, stabilizer 1.2%, deionized water to make up 100%;

[0131] The second synergist is sodium pyrophosphate, and the inorganic acid is hydrochloric acid;

[0132] The stabilizer is cetyltrimethylammonium salicylate.

[0133] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0134] Comparative Example 3

[0135] A geothermal drilling plugging removal fluid, which is the first component of Example 1, and the first synergist is omitted. The details are as follows:

[0136] The first component is made of the following components in percentage by mass:

[0137] Compound enzyme solution 80%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to make up 100%;

[0138] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0139] The corrosion inhibitor is Mannich base;

[0140] The stabilizer is cetyltrimethylammonium salicylate.

[0141] Preparation of the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, mix them evenly, and obtain the first component.

[0142] Comparative Example 4

[0143] A geothermal drilling plugging removal fluid, which is the second component of Example 1, and the second synergist is omitted. The details are as follows:

[0144] The second component is made of the following components in percentage by weight:

[0145] Inorganic acid 3%, stabilizer 1.2%, deionized water to make up 100%;

[0146] The inorganic acid is hydrochloric acid;

[0147] The stabilizer is cetyltrimethylammonium salicylate.

[0148] Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component.

[0149] Comparative Example 5

[0150] A geothermal drilling plugging removal fluid, which is the first component of Example 1, and the first synergist is omitted. The details are as follows:

[0151] The first component is made of the following components in percentage by mass:

[0152] Compound enzyme solution 80%, stabilizer 1.2%, corrosion inhibitor 1%, deionized water to make up 100%;

[0153] The compound enzyme solution is a mixture of acidic protease, cellulase, pectinase and deionized water, and the mass ratio of acidic protease, cellulase, pectinase and deionized water is 1:1:1:100;

[0154] The corrosion inhibitor is Mannich base;

[0155] The stabilizer is tetradecyltrimethylammonium salicylate.

[0156] Preparation of the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, mix them evenly, and obtain the first component.

[0157] It should be noted that the geothermal drilling fluid formulas and preparation methods of Examples 1 to 6 and Comparative Examples 1 to 5 are as described above. For specific experimental operation steps not specifically specified in the text, such as mixing the complex enzyme solution in a beaker, the same operation steps are used in each example and comparative example.

[0158] In order to demonstrate the effect of the present invention, we conducted the following experiments.

[0159] Blockage removal experiment 1

[0160] (1) Test method: refer to the method provided in the standard "SY-T 5405-1996 Test method and evaluation index of corrosion inhibitor performance for acidification". Under the condition of 150°C, the geothermal drilling plugging removal fluid provided in Examples 1 to 6 and Comparative Examples 1 to 5 was used to test the corrosion rate of N80 carbon steel samples. Three parallel tests were performed and the average value was taken.

[0161] It should be noted that this test method is a prior art, so the detailed test steps are not repeated. Other prior arts such as CN110540832B also use this test method, which can accurately reflect the unblocking effect of the unblocking fluid.

[0162] The test results of the present invention are shown in Table 1.

[0163] Table 1 Results of the unblocking experiment

[0164]

[0165] The dissolution performance and corrosion rate show the deblocking effect of the deblocking fluid. In Table 1, the geothermal drilling deblocking fluids of Examples 1 to 6 include a first component and a second component. The experimental results show that the dissolution performance and corrosion rate of the deblocking fluids are improved compared with those of the prior art.

[0166] Comparative Example 1 contains only the first component, and Comparative Example 3 contains only the second component. Compared with Example 1, the effects of the first component, the second component, and the mixture of the first component and the second component are demonstrated. The results show that after the first component and the second component are mixed, the dissolution performance and corrosion rate are improved, and the declogging effect of the composite factor is better.

[0167] Comparative Example 3 removes the first synergist. Compared with Comparative Example 1, the effect of the first synergist is demonstrated. The results show that when the first synergist is benzenesulfonic acid, the dissolution performance can be improved by 26.23% and the corrosion rate can be improved by 8.88%.

[0168] Comparative Example 4 removes the second synergist. Compared with Comparative Example 2, the effect of the second synergist is demonstrated. The results show that when the second synergist is hexadecyltrimethylammonium salicylate, the dissolution performance can be improved by 22.13% and the corrosion rate can be improved by 10.08%.

[0169] Comparative Example 5 removes the second synergist. Compared with Comparative Example 2, the effect of the second synergist is demonstrated. The results show that when the second synergist is tetradecyltrimethylammonium salicylate, the dissolution performance can be improved by 23.48% and the corrosion rate can be improved by 11.04%.

[0170] Based on the above research results, the present invention also provides a geothermal drilling blockage removal construction process, see Figure 1 When a geothermal drilling blockage occurs, the first component and the second component are alternately injected into the well in a volume ratio of 1:1; after each injection of the first component or the second component, the well is left to stand for 4 to 6 hours, preferably for 5 hours, and the front liquid is discharged before the rear liquid is injected; after 2 to 5 alternating cycles, the blockage is completely removed and the geothermal drilling unblocking fluid is discharged.

[0171] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, once those skilled in the art know the basic creative concept, they can make other changes and modifications to these embodiments, and these changes and modifications all fall within the scope of the present invention.

[0172] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. If these modifications and variations of the present invention fall within the scope of the equivalent technology of the present invention, the present invention is also intended to include these modifications and variations.

Claims

1. A geothermal drilling plugging removal fluid, characterized in that: comprising a first component and a second component; The first component is made of the following components in percentage by mass: Compound enzyme solution 80%-83%, first synergist 0.1%-0.3%, stabilizer 1.2%-1.5%, corrosion inhibitor 1%-1.5%, deionized water to make up 100%; The compound enzyme solution is a mixture of acid protease, cellulase, pectinase and deionized water; The first synergist is benzenesulfonic acid or its derivatives; The second component is made of the following components in percentage by weight: Inorganic acid 3%~5%, second synergist 0.3%~0.5%, stabilizer 1.2%~1.5%, deionized water to make up 100%; The second synergist is pyrophosphate; The stabilizer component is the same in the first component and the second component.

2. The geothermal drilling plugging removal fluid according to claim 1, characterized in that: In the complex enzyme solution, the mass ratio of acid protease, cellulase, pectinase and deionized water is 1:1:1:

100.

3. The geothermal drilling plugging removal fluid according to claim 2, characterized in that: The first synergist is benzenesulfonic acid.

4. The geothermal drilling plugging removal fluid according to claim 3, characterized in that: The pyrophosphate is sodium pyrophosphate.

5. The geothermal drilling plugging removal fluid according to claim 4, characterized in that: The inorganic acid is hydrochloric acid.

6. The geothermal drilling plugging removal fluid according to claim 1, characterized in that: The stabilizer is tetradecyl trimethyl ammonium salicylate or hexadecyl trimethyl ammonium salicylate.

7. The geothermal drilling plugging removal fluid according to claim 6, characterized in that: The volume ratio of the first component to the second component is 1:

1.

8. The geothermal drilling plugging removal fluid according to claim 1, characterized in that: The geothermal drilling plugging removal fluid is prepared according to the following method: Prepare the first component: prepare a composite enzyme solution, a first synergist, a stabilizer, a corrosion inhibitor and deionized water according to the mass percentage of the components of the first component, and mix them evenly to obtain the first component; Preparation of the second component: prepare an inorganic acid, a second synergist, a stabilizer and deionized water according to the mass percentage of the components of the second component, mix them evenly, and obtain the second component. The first component and the second component are stored separately for later use.

9. A geothermal drilling unblocking construction process, characterized in that: When a geothermal drilling blockage occurs, the first component and the second component described in claim 1 are alternately injected into the well in a volume ratio of 1:1; after each injection of the first component or the second component, the well is left to stand for 4 to 6 hours, the front liquid is discharged and then the rear liquid is injected; the alternating cycle is repeated for more than 2 times until the blockage is completely unblocked, and the geothermal drilling unblocking fluid is discharged.

10. The geothermal drilling unblocking construction process according to claim 1, characterized in that: Let stand for 5 hours.

Images