Propylene alkyl alcohol ester, an anti-mud balling agent for drilling fluid, and its preparation method and application

Abstract

A kind of anti-mud balling agent propylene alkyl alcohol ester for drilling fluid and its preparation method and application. The anti-mud balling agent propylene alkyl alcohol ester is made of octadecyl acrylate, acrylamide, unsaturated fatty alcohol A, unsaturated fatty alcohol B, phosphoric acid, initiator, catalyst, deionized water and pH regulator. Preparation method: add unsaturated fatty alcohol A, phosphoric acid, catalyst and deionized water into a reactor, stir, heat up, carry out esterification reaction, cool down to obtain the first solution; add octadecyl acrylate, acrylamide, unsaturated fatty alcohol B, adjust the pH value of the solution to obtain the second solution; increase the temperature, add the initiator, react at a constant temperature, then increase the temperature, keep warm, obtain the product, and filter out the water. The anti-mud balling agent propylene alkyl alcohol ester of the present invention can form a dense film on the metal surface of drill bits, drilling tools, etc., has good lubrication performance, reduces clay adsorption on the metal surface, solves the problem of mud balling and drilling, and has good performance at 200°C.

Description

Technical Field

[0001] The present invention relates to an oil drilling auxiliary agent, in particular to an anti-mud balling agent for drilling fluid, specifically to an anti-mud balling agent propylene alkyl alcohol ester for drilling fluid. The present invention also relates to a preparation method and application of the anti-mud balling agent propylene alkyl alcohol ester for drilling fluid. Background Art

[0002] The mud balling and pipe sticking problems encountered by drill bits and drilling tools in oil drilling have always been prominent issues affecting smooth drilling, especially with the increasing number of deep wells, high-temperature wells and large horizontal wells, the above problems are more prominent.

[0003] To solve the mud balling problem of drill bits and drilling tools, it is necessary to maintain and adjust the performance of drilling fluid, improve the ability of drilling fluid to clean drill bits and drilling tools, and prevent drill cuttings, clay, etc. from adhering to the drill bit. However, most of the current anti-mud balling agents (i.e. anti-mud balling treatment agents) are improved on the basis of lubricants, and the anti-mud balling performance needs to be further improved.

[0004] Related patent literature: CN103642466A discloses a new type of anti-mud bag and filtration loss reducing drilling fluid treatment agent, which is composed of the following raw materials in weight ratio: composite ion polymer 30%-50%, organosilicon potassium humate 5%-15%, quaternary ammonium salt 3%-7%, sodium salt 5%-15%, HV-CMC 2%-4%, flake graphite 5%-9%, sulfonated phenolic resin 5%-15%, and synergist 10%-20%. The synergist is composed of the following raw materials in weight ratio: 10%-30% ethylenediamine, 20%-50% hydrogen peroxide, 30%-50% vinyl monomer, and 5%-15% plasticizer. The above raw materials are mixed and reacted at 80°C for 4 hours. The beneficial effects of this technical solution are: convenient and fast, labor-saving and labor-saving, and the drilling fluid can be adjusted by adding the treatment agent to the drilling fluid without adding other additives. This technical solution uses more raw materials and the cost is relatively high.

[0005] The above technology does not provide a specific guidance scheme for the present invention on how to make the metal surface of the drill bit and drilling tools in oil drilling have good lubrication performance, reduce clay adsorption on the metal surface, and improve the anti-mud balling performance of the anti-mud balling agent. Summary of the invention

[0006] In view of the shortcomings of the current anti-balling agent technology, the purpose of the present invention is to provide an anti-balling agent for drilling fluid, propylene alkyl alcohol ester, which can make the metal surface of the drill bit and drilling tools in oil drilling have good lubrication performance, reduce the clay adsorption on the metal surface, avoid the problem of mud balling and drill sticking, and it has good performance and can resist high temperature.

[0007] To this end, another object of the present invention is to provide a preparation method and application of the above-mentioned anti-mud balling agent propylene alkyl alcohol ester for drilling fluid.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0009] A drilling fluid anti-balling agent propylene alkyl alcohol ester (or a drilling fluid anti-balling treatment agent propylene alkyl alcohol ester), the technical solution of which is that it is made of raw materials with the following mass ratio (mass fraction):

[0010] 0.1-0.3 parts of octadecyl acrylate, 30-45 parts of acrylamide, 3-5 parts of unsaturated fatty alcohol A, 4-7 parts of unsaturated fatty alcohol B, 6-10 parts of phosphoric acid, 0.05-0.1 parts of initiator, 0.05-0.08 parts of catalyst, 100 parts of deionized water, and pH adjuster; the amount of pH adjuster used should meet the requirement of achieving the pH value of the solution after adjustment.

[0011] The unsaturated fatty alcohol A is one or a combination of two (raw materials) of 3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol, and the ratio of the combination is arbitrary.

[0012] The unsaturated fatty alcohol B is one or a combination of butene glycol and 1-butene-3-ol (raw materials), and the ratio of the combination is arbitrary. The CAS number of 1-butene-3-ol is 598-32-3, also known as 3-butene-2-ol.

[0013] In the above technical scheme, the preferred technical scheme may be that the initiator may be any one of azobisisobutyronitrile, azobisisoheptanenitrile, benzoyl peroxide, tert-butyl perbenzoate, diisopropylbenzene peroxide, and diisopropylbenzene hydroperoxide. The catalyst may be any one of thionyl chloride and dimethyl phosphate. The pH regulator may be a sodium hydroxide aqueous solution having a mass percentage concentration of 10%.

[0014] The preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps:

[0015] (1) First, unsaturated fatty alcohol A, phosphoric acid, catalyst and deionized water are added into a reaction kettle according to the above mass ratio, stirred evenly, heated, and esterification reaction is carried out for 4 to 6 hours, and cooled to room temperature (23 to 25°C, 25°C can be used) to obtain the first solution;

[0016] (2) Adding the above-mentioned mass ratio of octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B (polymerization) to the first solution in the reaction kettle, stirring evenly, and adjusting the pH value of the solution to 7-9 using a pH adjuster to obtain a second solution;

[0017] (3) Raise the temperature of the reactor to 40-60°C, add an initiator to the second solution under stirring, react at a constant temperature for 4-6 hours, then raise the temperature to 60-80°C, keep warm for 2-4 hours to obtain a product, filter the product to remove water, and obtain propylene alkyl alcohol ester (final product), an anti-mud balling agent for drilling fluid. The final product is a viscous liquid.

[0018] In the above technical scheme, a preferred technical scheme may be that in the method for preparing the drilling fluid anti-mud balling agent propylene alkyl alcohol ester, the temperature in step (1) is preferably raised to 40-60° C. The stirring speed in step (3) is preferably 250-300 r / min.

[0019] The application of the anti-balling agent propylene alkyl alcohol ester in drilling fluid: when used, the anti-balling agent propylene alkyl alcohol ester can be directly added to the drilling fluid (mud), and the amount of the anti-balling agent propylene alkyl alcohol ester added to the (water-based) drilling fluid is 0.5% to 1.5% of the weight of the drilling fluid, for example, the amount added to the base slurry is 1.5% of the weight of the base slurry. In the oil drilling industry, the base slurry usually refers to the basic slurry used for drilling fluid, which can be a water-based slurry. Adding the anti-balling agent propylene alkyl alcohol ester of the present invention to the drilling fluid can form a firm polymer film on the metal surface of the drill bit and drilling tools in oil drilling, so that the metal surface changes from hydrophilic to oleophilic, reduces the adsorption of drill cuttings and clay particles on the metal surface, prevents the formation of mud balls, and can clean the drill bit and drilling tools.

[0020] Compared with the prior art, the characteristics and beneficial effects of the present invention are as follows:

[0021] (1) The anti-balling agent for drilling fluid of the present invention, propylene alkyl alcohol ester, is a polymer, which contains a carbonyl group in its structure, has high polarity and activity, and contains a strongly adsorbent amide group, which forms a firm polymer film on the metal surface of the drill bit and drilling tools in oil drilling, so that the metal surface changes from hydrophilic to oleophilic, reduces the adsorption of drill cuttings and clay particles on the metal surface, and prevents the formation of balling.

[0022] (2) Unsaturated fatty alcohols participate in the polymerization reaction, and the polymer contains short-chain hydroxyl groups, which can form a dense thick film on the surface of drill bits and drill tools, further increasing the lubricity.

[0023] (3) The polymer structure contains a phosphate structure, which can form a high-strength phosphate film on the surface of the drill string and casing related to the drilling tool, thereby improving the compression and shear resistance, reducing the wear between the drill string and the casing, and greatly preventing metal surface corrosion.

[0024] (4) The raw materials of the present invention are widely available, cheap and easy to obtain, and the reaction is simple, which greatly saves costs. The anti-mud balling agent propylene alkyl alcohol ester can be adsorbed on the drill bit and drill tools, so that the metal surface changes from hydrophilic to oleophilic, thereby reducing the adhesion of clay drill cuttings on the surface, increasing the drilling speed, and reducing the occurrence of complex accidents downhole. At the same time, the anti-mud balling agent propylene alkyl alcohol ester has lubricating properties, which can reduce the friction torque between the drill tool and the well wall, shortening the drilling cycle.

[0025] In summary, the present invention provides a drilling fluid anti-mud balling agent propylene alkyl alcohol ester, which can make the metal surface of the drill bit and drill tools in oil drilling have good lubrication performance, reduce the clay adsorption on the metal surface, avoid the mud balling and drill sticking problem, and it has good performance and can withstand high temperature of 200°C, see the experimental part at the end of this specification. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described in conjunction with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0027] Example 1: The anti-mud balling agent propylene alkyl alcohol ester for drilling fluid of the present invention is made of the following raw materials in the following mass ratio: 0.1 parts of octadecyl acrylate, 45 parts of acrylamide, 5 parts of unsaturated fatty alcohol A, 4 parts of unsaturated fatty alcohol B, 10 parts of phosphoric acid, 0.07 parts of initiator, 0.08 parts of catalyst, 100 parts of deionized water, and pH regulator; the amount of pH regulator should meet the requirement of reaching the pH value of the solution after adjustment.

[0028] The unsaturated fatty alcohol A is 3,7-dimethyl-7-octenol. The unsaturated fatty alcohol B is butenediol. The initiator is azobisisobutyronitrile. The catalyst is thionyl chloride. The pH regulator is a sodium hydroxide aqueous solution with a mass percentage concentration of 10%.

[0029] In this embodiment, the preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps:

[0030] (1) First, unsaturated fatty alcohol A, phosphoric acid, catalyst and deionized water were added into a reaction kettle according to the above mass ratio, stirred evenly, heated to 45°C, and esterification reaction was carried out for 4 hours, and cooled to room temperature (25°C) to obtain the first solution;

[0031] (2) adding octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B in the above mass ratio to the first solution in the reactor, stirring evenly, and adjusting the pH value of the solution to 7 using a pH adjuster to obtain a second solution;

[0032] (3) Raise the temperature of the reactor to 50°C, add the initiator to the second solution under stirring (stirring speed is 300 r / min), react at constant temperature for 5 hours, then raise the temperature to 70°C and keep it warm for 2 hours to obtain the product, filter out the water from the product, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

[0033] Example 2: The anti-mud balling agent propylene alkyl alcohol ester for drilling fluid of the present invention is made of the following raw materials in the following mass ratio: 0.2 parts of octadecyl acrylate, 35 parts of acrylamide, 4 parts of unsaturated fatty alcohol A, 6 parts of unsaturated fatty alcohol B, 7 parts of phosphoric acid, 0.05 parts of initiator, 0.06 parts of catalyst, 100 parts of deionized water, and pH regulator; the amount of pH regulator should meet the requirement of achieving the pH value of the solution after adjustment.

[0034] The unsaturated fatty alcohol A is 3,7-dimethyl-6-octen-1-ol. The unsaturated fatty alcohol B is 1-butene-3-ol. The initiator is diisopropylbenzene hydroperoxide. The catalyst is dimethyl phosphate. The pH regulator is a sodium hydroxide aqueous solution with a mass percentage concentration of 10%.

[0035] In this embodiment, the preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps:

[0036] (1) First, unsaturated fatty alcohol A, phosphoric acid, catalyst and deionized water were added into the reaction kettle according to the above mass ratio, stirred evenly, heated to 45°C, and esterification reaction was carried out for 4.5 hours, and cooled to room temperature (25°C) to obtain the first solution;

[0037] (2) adding octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B in the above mass ratio to the first solution in the reactor, stirring evenly, and adjusting the pH value of the solution to 8 using a pH adjuster to obtain a second solution;

[0038] (3) Raise the temperature of the reactor to 50°C, add the initiator to the second solution under stirring (stirring speed is 250 r / min), react at constant temperature for 4.5 hours, then raise the temperature to 75°C and keep warm for 2.5 hours to obtain the product, filter out the water from the product, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

[0039] Example 3: The anti-mud balling agent propylene alkyl alcohol ester for drilling fluid of the present invention is made of the following raw materials in the following mass ratio: 0.3 parts of octadecyl acrylate, 35 parts of acrylamide, 4 parts of unsaturated fatty alcohol A, 6 parts of unsaturated fatty alcohol B, 9 parts of phosphoric acid, 0.08 parts of initiator, 0.06 parts of catalyst, 100 parts of deionized water, and pH regulator; the amount of pH regulator should meet the requirement of achieving the pH value of the solution after adjustment.

[0040] The unsaturated fatty alcohol A is a combination of two raw materials, 3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol, and the mass ratio of the two raw materials is 1:1. The unsaturated fatty alcohol B is butene glycol. The initiator is benzoyl peroxide. The catalyst is dimethyl phosphate. The pH regulator is a sodium hydroxide aqueous solution with a mass percentage concentration of 10%.

[0041] In this embodiment, the preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps:

[0042] (1) First, unsaturated fatty alcohol A (3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol), phosphoric acid, catalyst and deionized water were added into a reaction kettle according to the above mass ratio, stirred evenly, heated to 55°C, and esterification reaction was carried out for 5 hours, and cooled to room temperature (25°C) to obtain the first solution;

[0043] (2) adding octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B in the above mass ratio to the first solution in the reactor, stirring evenly, and adjusting the pH value of the solution to 9 using a pH adjuster to obtain a second solution;

[0044] (3) Raise the temperature of the reactor to 57°C, add the initiator to the second solution under stirring (stirring speed is 270 r / min), react at constant temperature for 5 hours, then raise the temperature to 78°C and keep warm for 3 hours to obtain the product. Filter the product to remove water, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

[0045] Example 4: The anti-mud balling agent propylene alkyl alcohol ester for drilling fluid of the present invention is made of the following raw materials in the following mass ratio: 0.3 parts of octadecyl acrylate, 40 parts of acrylamide, 3 parts of unsaturated fatty alcohol A, 7 parts of unsaturated fatty alcohol B, 8 parts of phosphoric acid, 0.07 parts of initiator, 0.09 parts of catalyst, 100 parts of deionized water, and pH regulator; the amount of pH regulator should meet the requirement of achieving the pH value of the solution after adjustment.

[0046] The unsaturated fatty alcohol A is a combination of two raw materials, 3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol, and the mass ratio of the two raw materials is 1:2. The unsaturated fatty alcohol B is a combination of two raw materials, butene glycol and 1-butene-3-ol, and the mass ratio of the two raw materials is 1:3. The initiator is tert-butyl peroxybenzoate. The catalyst is dimethyl phosphate. The pH regulator is a sodium hydroxide aqueous solution with a mass percentage concentration of 10%.

[0047] In this embodiment, the preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps:

[0048] (1) First, unsaturated fatty alcohol A (3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol), phosphoric acid, catalyst and deionized water were added into a reaction kettle according to the above mass ratio, stirred evenly, heated to 60°C, and esterification reaction was carried out for 4 hours, and cooled to room temperature (25°C) to obtain the first solution;

[0049] (2) adding octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B (butylene glycol and 1-butene-3-ol) in the above-mentioned mass ratio to the first solution in the reaction kettle, stirring evenly, and adjusting the pH value of the solution to 8 using a pH adjuster to obtain a second solution;

[0050] (3) Raise the temperature of the reactor to 60°C, add the initiator to the second solution under stirring (stirring speed is 300 r / min), react at constant temperature for 4 hours, then raise the temperature to 80°C and keep warm for 3 hours to obtain the product, filter out the water from the product, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

[0051] Example 5: The anti-mud balling agent propylene alkyl alcohol ester for drilling fluid of the present invention is made of the following raw materials in the following mass ratio: 0.2 parts of octadecyl acrylate, 45 parts of acrylamide, 5 parts of unsaturated fatty alcohol A, 7 parts of unsaturated fatty alcohol B, 8 parts of phosphoric acid, 0.07 parts of initiator, 0.08 parts of catalyst, 100 parts of deionized water, and pH regulator; the amount of pH regulator should meet the requirement of achieving the pH value of the solution after adjustment.

[0052] The unsaturated fatty alcohol A is a combination of two raw materials, 3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol, and the mass ratio of the two raw materials is 3,7-dimethyl-7-octenol:3,7-dimethyl-6-octen-1-ol=2:1. The unsaturated fatty alcohol B is butene glycol. The initiator is diisopropylbenzene hydroperoxide. The catalyst is thionyl chloride. The pH regulator is a sodium hydroxide aqueous solution with a mass percentage concentration of 10%.

[0053] In this embodiment, the preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps:

[0054] (1) First, unsaturated fatty alcohol A (3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol), phosphoric acid, catalyst and deionized water were added into a reaction kettle according to the above mass ratio, stirred evenly, heated to 50°C, and esterification reaction was carried out for 5 hours, and cooled to room temperature (25°C) to obtain the first solution;

[0055] (2) adding octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B in the above mass ratio to the first solution in the reactor, stirring evenly, and adjusting the pH value of the solution to 9 using a pH adjuster to obtain a second solution;

[0056] (3) Raise the temperature of the reactor to 60°C, add the initiator to the second solution under stirring (stirring speed is 250 r / min), react at constant temperature for 5 hours, then raise the temperature to 78°C and keep warm for 3 hours to obtain the product, filter out the water from the product, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

[0057] The following is the experimental part of the present invention:

[0058] Preparation Comparative Example:

[0059] Comparative Example 1: An anti-balling agent for drilling fluid (i.e., an anti-balling agent for drilling fluid) was prepared by using the same raw materials and preparation method as those in Example 1 except that the raw material octadecyl acrylate was not added.

[0060] Comparative Example 2: An anti-balling agent for drilling fluid is prepared by using the same raw materials and preparation method as in Example 1 except that the raw material acrylamide is not added.

[0061] Comparative Example 3: An anti-balling agent for drilling fluid is prepared by using the same raw materials and preparation method as in Example 1 except that the raw materials unsaturated fatty alcohol A and phosphoric acid are not added.

[0062] Comparative Example 4: An anti-balling agent for drilling fluid is prepared by using the same raw materials and preparation method as in Example 1 except that the raw material unsaturated fatty alcohol B is not added.

[0063] Comparative Example 5: An anti-mud balling agent for drilling fluid is prepared by using the same raw materials and preparation method as in Example 1 except that the raw materials unsaturated fatty alcohol A and unsaturated fatty alcohol B are not added.

[0064] Test 1: Lubrication performance test.

[0065] (1) Take 11 goblets, add 350 mL of tap water, 14 g of bentonite, and 0.35 g of sodium carbonate into each goblet, stir at high speed for 5 min, remove the goblets, scrape off the bentonite adhering to the walls of the goblets, continue stirring for 15 min, and prepare the base slurry. The base slurry is sealed and cured at 25℃±1℃ for 24 h.

[0066] (2) Take 1 portion of the cured base slurry, stir it at high speed for 5 minutes, and test the lubricity coefficient according to the SY / T 6094-1994 "Evaluation Procedure for Lubricants for Drilling Fluids" standard. K 0.

[0067] (3) Collect the base slurry after step (1) and use the GNF mud cake adhesion coefficient tester to test the adhesion coefficient of the mud cake after the pressure loss of the base slurry API according to the instructions. f 0.

[0068] (4) Take another 10 portions of cured base slurry, add 1.5% (by weight of base slurry) of the anti-balling agent propylene alkyl alcohol ester (viscous liquid) of the present invention and the above comparative example (the addition amount of the comparative example is also 1.5%, i.e., 1.5% by weight of base slurry, the same below), stir at high speed for 5 minutes, and test the lubricity coefficient according to SY / T 6094-1994 "Evaluation Procedure for Lubricants for Drilling Fluids" standard K 1.

[0069] (5) After collecting the base slurry in step (4), use the GNF mud cake adhesion coefficient tester to test the adhesion coefficient of the base slurry API medium pressure filter loss mud cake according to the instructions. f 1.

[0070] The lubrication coefficient reduction rate is calculated according to the following formula: R K =( K 0- K 1) / K 0×100% (1)

[0071] The reduction rate of mud cake adhesion coefficient is calculated according to the following formula: f K =( f0- f 1) / f 0×100% (2)

[0072] The lubrication performance test results are shown in Table 1.

[0073] Test 2: Temperature resistance test.

[0074] (1) Prepare 11 parts of base slurry according to step (1) in Test 1 and cure in a sealed container at 25℃±1℃ for 24h.

[0075] (2) Take one portion of the cured base slurry, heat-roll it in a high-temperature roller furnace at 200°C for 16 hours, and use Test 1 to test the lubrication performance.

[0076] (3) Take another 10 parts of the cured base slurry, add 1.5% (accounting for the weight of the base slurry) of the anti-mud capsule agent propylene alkyl alcohol ester (viscous liquid) of the present invention and the above-mentioned comparative example, use a high-temperature roller furnace to heat roll at 200°C for 16 hours, and use Test 1 method to test the lubrication performance of each.

[0077] The temperature resistance test results are shown in Table 1.

[0078] Test three, anti-mud bag performance test.

[0079] (1) Prepare 11 parts of base slurry according to step (1) in Test 1 and cure in a sealed container at 25℃±1℃ for 24h.

[0080] (2) Take 1 portion of base slurry, place the simulated drill bit (steel rod) into an aging tank, and heat it in a roller heating furnace at 60°C for 1 h. Observe the mud packing of the steel rod and evaluate the anti-mud packing performance by weighing the mass m (unit: gram, expressed in g) of the mud packing clay on the surface of the steel rod.

[0081] (3) Take another 10 parts of base slurry, and add 1.5% (accounting for the weight of the base slurry) of the anti-mud balling agent of the present invention, propylene alkyl alcohol ester (viscous liquid), and the above comparative example, that is, add the anti-mud balling agent of the embodiment and the comparative example to 10 parts of the base slurry, and evaluate the anti-mud balling performance of each embodiment and the comparative example respectively according to the same method as step (2).

[0082] The above test data results are shown in Table 1. Example 1, Example 2, Example 3, Example 4, and Example 5 in Table 1 are respectively propylene alkyl alcohol esters of anti-mud balling agents for drilling fluids prepared by the present invention. The comparative examples in Table 1 are comparative examples 1 to 5 prepared by the above method.

[0083] Table 1 Performance test results of the drilling fluid anti-balling agent propylene alkyl alcohol ester of the present invention and the comparative example

[0084]

[0085] It can be seen from the data in Table 1 that by adding the anti-mud balling agent propylene alkyl alcohol ester (product) for drilling fluid prepared in Examples 1 to 5 of the present invention to the drilling fluid, the lubrication coefficient reduction rate of the drilling fluid is more than 96%, and the mud cake adhesion coefficient reduction rate is more than 66%, and the lubrication performance is good; after hot rolling at 200°C, the lubrication coefficient reduction rate is more than 85%, and the mud cake adhesion coefficient reduction rate is more than 53%, indicating that the anti-mud balling agent propylene alkyl alcohol ester of the present invention has good high temperature resistance. At the same time, the mud balling quality is greatly reduced compared with the base slurry, and it has good anti-mud balling performance. However, the performance of comparative examples 1, 2, 3, 4, and 5 is poor. The performance results of each comparative example show that the raw materials used in the present invention are necessary, and the synergistic effect of each component (raw material) makes the anti-mud balling agent propylene alkyl alcohol ester of the present invention produce the above-mentioned good technical effects.

[0086] In summary, the above embodiments of the present invention provide a drilling fluid anti-balling agent propylene alkyl alcohol ester, which can form a firm lubricating polymer film on the metal surface of the drill bit and drilling tools in oil drilling, reduce the adsorption of drill cuttings and clay particles on the metal surface, effectively prevent the formation of mud balls, and have good performance at a high temperature of 200°C, while reducing the wear of the drill string and casing, and greatly preventing the corrosion of the metal surface. The raw materials of the present invention are widely available, cheap and easy to obtain, and the reaction is simple, which greatly saves costs. Compared with the existing anti-balling agent, the manufacturing cost of the present invention is reduced by more than 12%.

Claims

1. A drilling fluid anti-balling agent propylene alkyl alcohol ester, characterized in that: It is made of the following raw materials in the following quality ratios: 0.1-0.3 parts of octadecyl acrylate, 30-45 parts of acrylamide, 3-5 parts of unsaturated fatty alcohol A, 4-7 parts of unsaturated fatty alcohol B, 6-10 parts of phosphoric acid, 0.05-0.1 parts of initiator, 0.05-0.08 parts of catalyst, 100 parts of deionized water, pH regulator; the amount of pH regulator should meet the requirement of reaching the pH value of the solution after adjustment; The unsaturated fatty alcohol A is one of 3,7-dimethyl-7-octenol and 3,7-dimethyl-6-octen-1-ol or a combination of the two, and the ratio of the combination is arbitrary; The unsaturated fatty alcohol B is one or a combination of butene glycol and 1-butene-3-ol, and the ratio of the combination is arbitrary; The preparation method of the drilling fluid anti-balling agent propylene alkyl alcohol ester comprises the following process steps: (1) First, unsaturated fatty alcohol A, phosphoric acid, catalyst and deionized water are added into a reaction kettle according to the above mass ratio, stirred evenly, heated, and esterification reaction is carried out for 4 to 6 hours, and cooled to room temperature to obtain the first solution; (2) Adding the above-mentioned mass ratio of octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B to the first solution in the reactor, stirring evenly, and adjusting the pH value of the solution to 7-9 using a pH adjuster to obtain a second solution; (3) Raise the temperature of the reactor to 40-60°C, add the initiator to the second solution under stirring, react at a constant temperature for 4-6 hours, then raise the temperature to 60-80°C and keep it warm for 2-4 hours to obtain the product, filter out the water from the product, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

2. The anti-balling agent for drilling fluid according to claim 1, characterized in that The initiator is one of azobisisobutyronitrile, azobisisoheptanenitrile, benzoyl peroxide, tert-butyl perbenzoate, diisopropylbenzene peroxide and diisopropylbenzene hydroperoxide.

3. The anti-balling agent for drilling fluid according to claim 1, characterized in that The catalyst is one of thionyl chloride and dimethyl phosphate.

4. The anti-balling agent for drilling fluid according to claim 1, characterized in that The pH regulator is a sodium hydroxide aqueous solution with a mass percentage concentration of 10%.

5. The method for preparing the anti-balling agent propylene alkyl alcohol ester for drilling fluid according to any one of claims 1 to 4, characterized in that It includes the following process steps: (1) First, unsaturated fatty alcohol A, phosphoric acid, catalyst and deionized water are added into a reaction kettle according to the above mass ratio, stirred evenly, heated, and esterification reaction is carried out for 4 to 6 hours, and cooled to room temperature to obtain the first solution; (2) Adding the above-mentioned mass ratio of octadecyl acrylate, acrylamide, and unsaturated fatty alcohol B to the first solution in the reactor, stirring evenly, and adjusting the pH value of the solution to 7-9 using a pH adjuster to obtain a second solution; (3) Raise the temperature of the reactor to 40-60°C, add the initiator to the second solution under stirring, react at a constant temperature for 4-6 hours, then raise the temperature to 60-80°C and keep it warm for 2-4 hours to obtain the product, filter out the water from the product, and obtain propylene alkyl alcohol ester, an anti-mud packing agent for drilling fluid.

6. The method for preparing the anti-balling agent propylene alkyl alcohol ester for drilling fluid according to claim 5, characterized in that In step (1), the temperature is raised to 40-60°C.

7. The method for preparing the anti-balling agent propylene alkyl alcohol ester for drilling fluid according to claim 5, characterized in that The stirring speed in step (3) is 250-300 r / min.

8. Use of the anti-balling agent propylene alkyl alcohol ester according to any one of claims 1 to 4 in drilling fluid.

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