Water-based drilling fluid lubricant dispersant synergist and preparation method and application thereof

Abstract

The invention relates to the technical field of drilling fluid additives, and is a water-based drilling fluid lubricant dispersing synergist and a preparation method and application thereof. The water-based drilling fluid lubricant dispersing synergist comprises raw materials including hydroxymethyl cellulose, acrylic resin, polyvinyl alcohol, lignin sulfonate, petroleum sulfonate, barium sulfate, barium hydroxide, ammonium sulfate, ammonium chloride and sodium benzoate. The water-based drilling fluid lubricant dispersing synergist is prepared by using the water-based drilling fluid lubricant dispersing synergist as a raw material. The invention makes the prepared water-based drilling fluid lubricant dispersing synergist have excellent water solubility, lubrication performance and stability through the control of the preparation raw materials and the proportion of the preparation raw materials, and meets the use requirements of lubricants in high-temperature drilling environments.

Description

Technical Field

[0001] The invention relates to the technical field of drilling fluid additives, and is a water-based drilling fluid lubricant dispersing synergist, a preparation method and application thereof. Background Art

[0002] With the popularization of directional well, horizontal well and extended reach well technology, the problem of high friction and torque in the horizontal section has become increasingly prominent, which can easily cause complex problems such as drill wear, drill bit sticking and delay in drilling cycle. Adding suitable drilling fluid lubricants to improve the lubricity of drilling fluid is the main method to reduce friction and drag. Currently, the commonly used drilling liquid lubricants include mineral oils, modified animal oils, surfactants, polyols and polymer alcohols. The main problems faced by existing lubricant products are insufficient water solubility and stability, which may lead to the lubrication effect failing to achieve the expected under high temperature environment and cannot meet the needs of the drilling environment. Summary of the invention

[0003] The present invention provides a water-based drilling fluid lubricant dispersant and a preparation method and application thereof, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of insufficient water solubility and stability of the existing drilling fluid lubricant.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a method for preparing a water-based drilling fluid lubricant dispersant synergist, wherein the raw materials, by weight, include 35 to 42 parts of hydroxymethyl cellulose, 3 to 6 parts of acrylic resin, 1 to 3 parts of polyvinyl alcohol, 8 to 13 parts of lignin sulfonate, 1 to 4 parts of petroleum sulfonate, 7 to 12 parts of barium sulfate, 0.5 to 1 part of barium hydroxide, 0.5 to 2 parts of ammonium sulfate, 2 to 6 parts of ammonium chloride and 3 to 6 parts of sodium benzoate.

[0005] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions:

[0006] The above raw materials are calculated by weight: 40 parts of hydroxymethyl cellulose, 5 parts of acrylic resin, 2 parts of polyvinyl alcohol, 10 parts of lignin sulfonate, 3 parts of petroleum sulfonate, 10 parts of barium sulfate, 1 part of barium hydroxide, 1 part of ammonium sulfate, 3 parts of ammonium chloride and 4 parts of sodium benzoate.

[0007] The preparation method of the water-based drilling fluid lubricant dispersant synergist is carried out as follows:

[0008] Dissolve the required amount of hydroxymethyl cellulose, acrylic resin and polyvinyl alcohol in water to obtain raw material component 1, dissolve the required amount of lignin sulfonate and petroleum sulfonate in water to obtain raw material component 2, dissolve the required amount of barium sulfate and barium hydroxide in water to obtain raw material component 3, dissolve the required amount of ammonium sulfate and ammonium chloride in water to obtain raw material component 4, and dissolve the required amount of sodium benzoate in water to obtain raw material component 5;

[0009] The pH value of the base oil is adjusted to neutral or weakly alkaline, and then raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 are added to the base oil in sequence while stirring the base oil. After the raw materials are added, stirring is continued to obtain a mixed material, and the pH value of the mixed material is adjusted to neutral or weakly alkaline, and then the mixed material is heated to obtain a water-based drilling fluid lubricant dispersant synergist.

[0010] The corresponding pH adjuster can be selected according to the pH value of the base oil. For example, when the pH value of the base oil is acidic, sodium hydroxide can be used to adjust the pH value. When the pH value of the base oil is alkaline, acids such as hydrochloric acid can be used to adjust the pH value.

[0011] During the dissolution process of the above-mentioned raw materials, the amount of water used is until each raw material is completely dissolved.

[0012] The heating temperature of the above-mentioned mixed material is 60°C to 80°C.

[0013] The heating time of the above mixed material is 30 minutes to 50 minutes.

[0014] The stirring speed is 300 to 500 rpm, and the total stirring time is 30 to 50 minutes.

[0015] The second technical solution of the present invention is achieved by the following measures: a water-based drilling fluid lubricant dispersant synergist prepared by the preparation method described in the first technical solution.

[0016] The third technical solution of the present invention is achieved by the following measures: the water-based drilling fluid lubricant dispersant synergist described in the second technical solution is used in the water-based drilling fluid, and the amount of the water-based drilling fluid lubricant dispersant synergist added to the fresh water base slurry of the water-based drilling fluid is 0.5%.

[0017] Water-based drilling fluid lubricant dispersant synergist has excellent water solubility and stable lubrication performance in water-based drilling fluid.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The addition of carboxymethyl cellulose can improve the viscosity and stability of the water-based drilling fluid lubricant dispersant, which helps prevent the excessive dispersion of drill cuttings in the drilling fluid; the addition of acrylic resin can provide film-forming properties for the water-based drilling fluid lubricant dispersant, which helps to form a protective film on the surface of the drill bit and drill pipe to reduce friction.

[0020] The addition of polyvinyl alcohol can enhance the adhesion of the water-based drilling fluid lubricant dispersant, making it better adhere to the surface of the drill bit; the addition of lignin sulfonate can improve the suspension ability of the water-based drilling fluid lubricant dispersant and prevent the deposition of drill cuttings.

[0021] The addition of petroleum sulfonate can improve the lubricity and cleaning ability of water-based drilling fluid lubricant dispersant, which helps to prevent the adhesion of drill bits and drill pipes; the addition of barium sulfate can increase the density of water-based drilling fluid lubricant dispersant, which helps to better carry and suspend drill cuttings; the addition of barium hydroxide can improve the stability of water-based drilling fluid lubricant dispersant and prevent corrosion of drilling tools; the addition of ammonium sulfate can improve the viscosity and fluidity of water-based drilling fluid lubricant dispersant; ammonium chloride can enhance the performance of water-based drilling fluid lubricant dispersant; the addition of sodium benzoate can extend the shelf life of the lubricant and prevent the growth of microorganisms.

[0022] In addition, the present invention controls the raw materials (i.e., hydroxymethyl cellulose, acrylic resin, polyvinyl alcohol, lignin sulfonate, petroleum sulfonate, barium sulfate, barium hydroxide, ammonium sulfate, ammonium chloride and sodium benzoate) and the proportion of the raw materials so that the prepared water-based drilling fluid lubricant dispersant synergist has excellent water solubility, lubrication performance and stability, and meets the use requirements of lubricants in high-temperature drilling environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is the raw material ingredient diagram of the present invention. DETAILED DESCRIPTION

[0024] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0025] The various chemical reagents and chemicals mentioned in the present invention, unless otherwise specified, are all chemical reagents and chemicals commonly used in the prior art; the percentages in the present invention, unless otherwise specified, are all mass percentages; the solutions in the present invention, unless otherwise specified, are all aqueous solutions with water as the solvent, for example, hydrochloric acid solution is an aqueous hydrochloric acid solution; the room temperature in the present invention is generally defined as 25°C.

[0026] The present invention will be further described below in conjunction with embodiments:

[0027] Embodiment 1: The water-based drilling fluid lubricant dispersing synergist, the raw materials by weight, include 35 to 42 parts of hydroxymethyl cellulose, 3 to 6 parts of acrylic resin, 1 to 3 parts of polyvinyl alcohol, 8 to 13 parts of lignin sulfonate, 1 to 4 parts of petroleum sulfonate, 7 to 12 parts of barium sulfate, 0.5 to 1 part of barium hydroxide, 0.5 to 2 parts of ammonium sulfate, 2 to 6 parts of ammonium chloride and 3 to 6 parts of sodium benzoate.

[0028] Embodiment 2: The water-based drilling fluid lubricant dispersing synergist, the raw materials by weight, include 35 parts or 42 parts of hydroxymethyl cellulose, 3 parts or 6 parts of acrylic resin, 1 part or 3 parts of polyvinyl alcohol, 8 parts or 13 parts of lignin sulfonate, 1 part or 4 parts of petroleum sulfonate, 7 parts or 12 parts of barium sulfate, 0.5 parts or 1 part of barium hydroxide, 0.5 parts or 2 parts of ammonium sulfate, 2 parts or 6 parts of ammonium chloride and 3 parts or 6 parts of sodium benzoate.

[0029] Example 3: As a preferred embodiment of Example 2, the raw materials are, by weight, 40 parts of hydroxymethyl cellulose, 5 parts of acrylic resin, 2 parts of polyvinyl alcohol, 10 parts of lignin sulfonate, 3 parts of petroleum sulfonate, 10 parts of barium sulfate, 1 part of barium hydroxide, 1 part of ammonium sulfate, 3 parts of ammonium chloride and 4 parts of sodium benzoate.

[0030] Example 4: The water-based drilling fluid lubricant dispersant synergist is prepared according to the following preparation method:

[0031] The required amount of hydroxymethyl cellulose, acrylic resin and polyvinyl alcohol are dissolved in water to obtain raw material component 1, the required amount of lignin sulfonate and petroleum sulfonate are dissolved in water to obtain raw material component 2, the required amount of barium sulfate and barium hydroxide are dissolved in water to obtain raw material component 3, the required amount of ammonium sulfate and ammonium chloride are dissolved in water to obtain raw material component 4, and the required amount of sodium benzoate is dissolved in water to obtain raw material component 5 (see Figure 1 );

[0032] The pH value of the base oil is adjusted to neutral or weakly alkaline, and then raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 are added to the base oil in sequence while stirring the base oil. After the raw materials are added, stirring is continued to obtain a mixed material, and the pH value of the mixed material is adjusted to neutral or weakly alkaline, and then the mixed material is heated to obtain a water-based drilling fluid lubricant dispersant synergist.

[0033] The amount of base oil used is 80% to 85% of the sum of the base oil mass and the raw material mass.

[0034] Example 5: The water-based drilling fluid lubricant dispersant synergist is prepared according to the following preparation method:

[0035] Dissolve 35 to 42 parts of hydroxymethyl cellulose, 3 to 6 parts of acrylic resin and 1 to 3 parts of polyvinyl alcohol in water to obtain raw material component 1, dissolve 8 to 13 parts of lignin sulfonate and 1 to 4 parts of petroleum sulfonate in water to obtain raw material component 2, dissolve 7 to 12 parts of barium sulfate and 0.5 to 1 part of barium hydroxide in water to obtain raw material component 3, dissolve 0.5 to 2 parts of ammonium sulfate and 2 to 6 parts of ammonium chloride in water to obtain raw material component 4, and dissolve 3 to 6 parts of sodium benzoate in water to obtain raw material component 5;

[0036] The pH value of the base oil is adjusted to neutral or weakly alkaline, and then raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 are added to the base oil in sequence while stirring the base oil. After the raw materials are added, stirring is continued to obtain a mixed material, and the pH value of the mixed material is adjusted to neutral or weakly alkaline, and then the mixed material is heated to obtain a water-based drilling fluid lubricant dispersant synergist.

[0037] Example 6: As an optimization of the above example, during the dissolution process of each raw material, the amount of water used is until each raw material is completely dissolved.

[0038] Embodiment 7: As an optimization of the above embodiment, the heating temperature of the mixed material is 60 ℃ to 80 ℃.

[0039] Embodiment 8: As an optimization of the above embodiment, the heating time of the mixed material is 30 minutes to 50 minutes.

[0040] Embodiment 9: As an optimization of the above embodiment, the stirring speed is 300 rpm to 500 rpm, and the total stirring time is 30 minutes to 50 minutes.

[0041] Embodiment 10:

[0042] 40 g of carboxymethyl cellulose, 5 g of acrylic resin and 2 g of polyvinyl alcohol were added to a beaker and dissolved with water, and recorded as raw material component 1;

[0043] 10 g of lignin sulfonate and 3 g of petroleum sulfonate were added to a beaker, dissolved in water and recorded as raw material component 2;

[0044] Add 10 g of barium sulfate and 1 g of barium hydroxide into a beaker, dissolve them in water and record them as raw material component 3;

[0045] Add 1 g of ammonium sulfate and 3 g of ammonium chloride to a beaker, dissolve them in water and record them as raw material component 4;

[0046] 4 g of sodium benzoate was added to a beaker and dissolved in water, and recorded as raw material component 5.

[0047] The pH value of the base oil (310 g of white oil) was adjusted to 7, and then raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 were added to the base oil in sequence while stirring the base oil. After the raw materials were added, stirring was continued (speed 300 rpm) to obtain a mixture. The total stirring time was 50 minutes. The pH value of the mixture was adjusted to 7, and then the mixture was heated at 60° C. for 30 minutes to obtain a water-based drilling fluid lubricant dispersant synergist.

[0048] Embodiment 11:

[0049] 42 g of carboxymethyl cellulose, 3 g of acrylic resin and 3 g of polyvinyl alcohol were added to a beaker and dissolved with water, and recorded as raw material component 1;

[0050] 8 g of lignin sulfonate and 4 g of petroleum sulfonate were added to a beaker, dissolved in water and recorded as raw material component 2;

[0051] Add 12g of barium sulfate and 1g of barium hydroxide into a beaker, dissolve them in water and record them as raw material component 3;

[0052] Add 0.5 g of ammonium sulfate and 2 g of ammonium chloride into a beaker, dissolve them in water and record them as raw material component 4;

[0053] 6 g of sodium benzoate was added to a beaker and dissolved in water and recorded as raw material component 5.

[0054] The pH value of the base oil (320 g of white oil) was adjusted to 9, and then raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 were added to the base oil in sequence while stirring the base oil. After the raw materials were added, stirring was continued (speed of 500 rpm) to obtain a mixture. The total stirring time was 30 minutes. The pH value of the mixture was adjusted to 9, and then the mixture was heated at 80° C. for 40 minutes to obtain a water-based drilling fluid lubricant dispersant synergist.

[0055] Embodiment 12:

[0056] 35 g of carboxymethyl cellulose, 6 g of acrylic resin and 1 g of polyvinyl alcohol were added to a beaker and dissolved with water, and recorded as raw material component 1;

[0057] 13 g of lignin sulfonate and 1 g of petroleum sulfonate were added to a beaker, dissolved in water and recorded as raw material component 2;

[0058] Add 7 g of barium sulfate and 0.5 g of barium hydroxide into a beaker, dissolve them in water and record them as raw material component 3;

[0059] Add 2 g of ammonium sulfate and 6 g of ammonium chloride to a beaker, dissolve them in water and record them as raw material component 4;

[0060] 3 g of sodium benzoate was added to a beaker and dissolved in water and recorded as raw material component 5.

[0061] The pH value of the base oil (297 g white oil) was adjusted to 9, and then raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 were added to the base oil in sequence while stirring the base oil. After the raw materials were added, stirring was continued (speed of 500 rpm) to obtain a mixture. The total stirring time was 30 minutes. The pH value of the mixture was adjusted to 9, and then the mixture was heated at 80° C. for 50 minutes to obtain a water-based drilling fluid lubricant dispersant synergist.

[0062] In the following comparative examples, the quality of the raw materials was adjusted:

[0063] Raw material component 1*: 35g carboxymethyl cellulose, 7g acrylic resin and 5g polyvinyl alcohol;

[0064] Raw material component 2*: 8 g lignin sulfonate and 5 g petroleum sulfonic acid;

[0065] Raw material component 3*: 8 g barium sulfate and 4 g barium hydroxide;

[0066] Raw material component 4*: 3 g ammonium sulfate and 1 g ammonium chloride;

[0067] Raw material component 5*: The amount of sodium benzoate added is the same as in Example 10.

[0068] Comparative Example 1

[0069] The raw materials used in this comparative example are raw material component 1*, raw material component 2, raw material component 3, raw material component 4, and raw material component 5. The preparation method is the same as that of Example 10, and the lubricant is obtained.

[0070] Comparative Example 2

[0071] The raw materials used in this comparative example are raw material component 1, raw material component 2*, raw material component 3, raw material component 4, and raw material component 5. The preparation method is the same as that of Example 10, and the lubricant is obtained.

[0072] Comparative Example 3

[0073] The raw materials used in this comparative example are raw material component 1, raw material component 2, raw material component 3*, raw material component 4, and raw material component 5. The preparation method is the same as that of Example 10, and the lubricant is obtained.

[0074] Comparative Example 4

[0075] The raw materials used in this comparative example are raw material component 1, raw material component 2, raw material component 3, raw material component 4*, and raw material component 5. The preparation method is the same as that of Example 10, and the lubricant is obtained.

[0076] Performance Evaluation

[0077] 1) Lubrication performance evaluation

[0078] The water-based drilling fluid lubricant dispersing synergists obtained in Examples 10 to 12 and the lubricants obtained in Comparative Examples 1 to 4 were evaluated for lubrication performance.

[0079] Preparation of fresh water-based slurry: Add 400 mL of deionized water, 0.7 g of anhydrous sodium carbonate, and 20.0 g of experimental sodium boron clay into a slurry cup, and stir at a high speed of 10,000 r / min for 20 min. Stop twice during the stirring process and use a glass rod to scrape off the bentonite adhering to the stirring cup. After stirring, seal and cure at room temperature for 24 hours to obtain fresh water-based slurry.

[0080] The water-based drilling fluid lubricant dispersant synergist obtained in the example and the lubricant obtained in the comparative example were added to the fresh water-based slurry (the addition amount was 0.5%), and a high-temperature roller heating furnace was used. The aging temperature was 180°C, and the lubrication coefficient reduction rate before and after aging was tested. The test results are shown in Table 1.

[0081] It can be seen from the results in Table 1 that, compared with Comparative Examples 1 to 4, the lubrication coefficient reduction rate of the water-based drilling fluid lubricant dispersant synergist obtained in Examples 10 to 12 before and after aging does not change much, and is less affected by temperature. For example, the change in the lubrication coefficient reduction rate of the water-based drilling fluid lubricant dispersant synergist obtained in Example 10 before and after aging is 1.37%, indicating that the water-based drilling fluid lubricant dispersant synergist obtained in Examples 10 to 12 has good temperature resistance and better stability; at the same time, the lubrication coefficient of the water-based drilling fluid lubricant dispersant synergist obtained in Examples 10 to 12, whether before or after hot rolling (ie, aging), is lower than that of Comparative Examples 1 to 4, that is, the lubrication performance is better than that of Comparative Examples 1 to 4.

[0082] Taking the water-based drilling fluid lubricant dispersant synergist prepared in Example 10 as an example, the data in Table 1 are analyzed as follows:

[0083] Compared with Example 10, the amount of hydroxymethyl cellulose added in the raw material prepared in Comparative Example 1 is reduced, and the amount of acrylic resin and polyvinyl alcohol added is increased, resulting in a decrease in the viscosity and suspension of the drilling fluid, while the increase in the amount of acrylic resin and polyvinyl alcohol added can improve the lubricity and filtration control performance of the drilling fluid, but its lubricity coefficient is higher than that of Example 10, and the change in the lubricity coefficient reduction rate before and after hot rolling is 10.89%, and the temperature resistance is insufficient. In addition, the lubricant prepared in Comparative Example 1 exhibits excellent hydrophilicity, so it is easy to foam in the drilling fluid, which is not conducive to on-site use.

[0084] Compared with Example 10, the amount of lignin sulfonate added in the raw materials prepared in Comparative Example 2 is reduced, and the amount of petroleum sulfonate added is increased. The increase in the amount of petroleum sulfonate added can improve the lubricating performance of the lubricant to a certain extent. Since lignin sulfonate is a strong hydrophilic substance and petroleum sulfonate is a weak hydrophilic substance, compared with Example 10, the hydrophilicity of the lubricant prepared in Comparative Example 2 is reduced, and it is difficult to disperse in water, resulting in the lubricant being unable to effectively exert its lubricating performance in the drilling fluid, and the lubricating performance is weakened. Therefore, the lubricant prepared in Comparative Example 2 has a lubricity coefficient before hot rolling that is not only higher than that of Comparative Example 1, but also higher than that of Example 10. The lubricant prepared in Comparative Example 2 has a lubricity coefficient reduction rate before and after hot rolling of 6.11%, and the temperature resistance is lower than that of Example 10.

[0085] Compared with Example 10, Comparative Example 3 increases the addition amount of barium sulfate and barium hydroxide, but its lubrication coefficient is significantly increased. At the same time, the change in the reduction rate of the lubrication coefficient before and after hot rolling is 2.24%, indicating that the lubrication performance and stability of the lubricant prepared in Comparative Example 3 are lower than those of the water-based drilling fluid lubricant dispersant synergist prepared in Example 10.

[0086] Compared with Example 10, Comparative Example 4 increases the amount of ammonium sulfate added and reduces the amount of ammonium chloride added, and the lubricity coefficient of the lubricant obtained is significantly increased. At the same time, the change in the lubricity coefficient reduction rate before and after hot rolling is 3.28%, indicating that the lubrication performance and stability of the lubricant prepared in Comparative Example 4 are lower than those of the water-based drilling fluid lubricant dispersant synergist prepared in Example 10.

[0087] From the above analysis, it can be seen that the present invention, through the control of the preparation of raw materials and the proportion of the preparation of raw materials, makes the prepared water-based drilling fluid lubricant dispersant synergist have excellent water dispersibility (ie, water solubility), lubrication performance and stability.

[0088] 2) Experiment on the effect of the amount of water-based drilling fluid lubricant dispersant on lubrication performance

[0089] 0.2%, 0.3%, 0.4%, 0.5% and 0.6% of the water-based drilling fluid lubricant dispersant synergist of Example 10 were added to the fresh water-based slurry, and the mixture was stirred at a high speed of 10000 r / min for 20 min to form an experimental slurry. The performance of the water-based drilling fluid lubricant dispersant synergist before and after hot rolling at 180°C / 16h in the fresh water-based slurry (apparent viscosity (AV), plastic viscosity (PV), dynamic shear force (YP), API filtration loss (FL)) was tested. API ), the experimental results are shown in Table 2, in which the base slurry represents the fresh water base slurry, and the lubricant represents the water-based drilling fluid lubricant dispersant synergist of Example 10.

[0090] It can be seen from the test results in Table 2 that with the increase in the amount of water-based drilling fluid lubricant dispersant synergist, the lubrication coefficient reduction rate before and after hot rolling increases significantly. When the addition amount reaches 0.4%, the lubrication coefficient reduction rate reaches the maximum value, and at this time the lubrication coefficient reduction rate before and after hot rolling is 80.03% and 71.77%, and the change in the lubrication coefficient reduction rate before and after hot rolling is 8.26%; when the addition amount reaches 0.5%, the lubrication coefficient reduction rate before and after hot rolling is 72.63% and 71.26%, and the lubrication coefficient reduction rate can also reach a high level, and the change in the lubrication coefficient reduction rate before and after hot rolling is 1.37%; Obviously, when the addition amount reaches 0.5%, it can not only maintain a high lubrication performance, but also have better temperature resistance.

[0091] Compared with the freshwater-based slurry, the viscosity of the freshwater-based slurry before hot rolling was slightly reduced after adding the water-based drilling fluid lubricant dispersant, but remained basically unchanged. The viscosity of the experimental slurry after hot rolling decreased with the increase of the amount of water-based drilling fluid lubricant dispersant added, but the change was not significant. After adding the water-based drilling fluid lubricant dispersant, the density change range of the experimental slurry before and after hot rolling was less than 0.08g / cm2 required by the general lubricant standard. 3 Therefore, in fresh water-based slurry, the recommended amount of water-based drilling fluid lubricant dispersant is 0.5%.

[0092] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

[0093] Table 1 Evaluation of lubricant lubrication performance before and after high temperature aging

[0094] .

[0095] Table 2 Effect of the amount of dispersant synergist added to water-based drilling fluid lubricant on lubrication performance

[0096] .

Claims

1. A method for preparing a water-based drilling fluid lubricant dispersant synergist, characterized in that: The raw materials include, by weight, 35 to 42 parts of hydroxymethyl cellulose, 3 to 6 parts of acrylic resin, 1 to 3 parts of polyvinyl alcohol, 8 to 13 parts of lignin sulfonate, 1 to 4 parts of petroleum sulfonate, 7 to 12 parts of barium sulfate, 0.5 to 1 part of barium hydroxide, 0.5 to 2 parts of ammonium sulfate, 2 to 6 parts of ammonium chloride and 3 to 6 parts of sodium benzoate; The preparation method of the water-based drilling fluid lubricant dispersant synergist is carried out as follows: Dissolve the required amount of hydroxymethyl cellulose, acrylic resin and polyvinyl alcohol in water to obtain raw material component 1, dissolve the required amount of lignin sulfonate and petroleum sulfonate in water to obtain raw material component 2, dissolve the required amount of barium sulfate and barium hydroxide in water to obtain raw material component 3, dissolve the required amount of ammonium sulfate and ammonium chloride in water to obtain raw material component 4, and dissolve the required amount of sodium benzoate in water to obtain raw material component 5; The pH value of the base oil is adjusted to neutral or weakly alkaline, and then, while stirring the base oil, raw material component 1, raw material component 2, raw material component 3, raw material component 4 and raw material component 5 are sequentially added to the base oil. After the raw materials are added, stirring is continued to obtain a mixed material, and the pH value of the mixed material is adjusted to neutral or weakly alkaline, and then the mixed material is heated to obtain a water-based drilling fluid lubricant dispersant synergist; The amount of base oil used is 80% to 85% of the sum of the base oil mass and the raw material mass.

2. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 1, characterized in that: The components are calculated by weight: 40 parts of hydroxymethyl cellulose, 5 parts of acrylic resin, 2 parts of polyvinyl alcohol, 10 parts of lignin sulfonate, 3 parts of petroleum sulfonate, 10 parts of barium sulfate, 1 part of barium hydroxide, 1 part of ammonium sulfate, 3 parts of ammonium chloride and 4 parts of sodium benzoate.

3. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 1 or 2, characterized in that: The heating temperature of the mixed material is 60°C to 80°C.

4. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 1 or 2, characterized in that: The heating time of the mixed material is 30 minutes to 50 minutes.

5. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 3, characterized in that: The heating time of the mixed material is 30 minutes to 50 minutes.

6. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 1 or 2, characterized in that: The stirring speed is 300 rpm to 500 rpm, and the total stirring time is 30 min to 50 min.

7. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 3, characterized in that: The stirring speed is 300 rpm to 500 rpm, and the total stirring time is 30 min to 50 min.

8. The method for preparing the water-based drilling fluid lubricant dispersant synergist according to claim 5, characterized in that: The stirring speed is 300 rpm to 500 rpm, and the total stirring time is 30 min to 50 min.

9. A water-based drilling fluid lubricant dispersant synergist prepared by the preparation method according to any one of claims 1 to 8.

10. Use of the water-based drilling fluid lubricant dispersant synergist according to claim 9 in water-based drilling fluid, characterized in that: The amount of the water-based drilling fluid lubricant dispersant synergist added to the fresh water base slurry of the water-based drilling fluid is 0.5%.

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