Metal resistance reducing agent for water-based working fluid and preparation method of metal resistance reducing agent

Abstract

The invention relates to the technical field of water-based working solution additives, in particular to a metal resistance reducing agent for a water-based working solution and a preparation method thereof.The metal resistance reducing agent for the water-based working solution is obtained through the following steps that firstly, a tackifier is added into water to be mixed until the tackifier is completely swelled, then, an oil-in-water emulsifier and a defoaming agent are added to be evenly mixed, and finally, the metal resistance reducing agent for the water-based working solution is obtained. And adding the lubricating base oil, the lubricant, the anti-wear agent, the stabilizer and the bactericide, and uniformly mixing. The metal drag reducer for the water-based working fluid has good extreme pressure lubricity and metal wear resistance, can effectively reduce the friction resistance of an underground pipe column when being applied to underground operation, and can reduce the wear of a coiled tubing in an underground casing pipe at the same time. In addition, the metal drag reducer for the water-based working fluid has good water solubility, can be used in water-based working fluid such as clear water, potassium chloride saline water and underground flowback sewage, is convenient to use on site, can be automatically dispersed, and does not need slurry preparation equipment.

Description

Technical Field

[0001] The invention relates to the technical field of water-based working fluid additives, in particular to a metal drag reducing agent for water-based working fluid and a preparation method thereof. Background Art

[0002] In the past decade, coiled tubing has developed rapidly and is widely used in the fields of drilling and grinding bridge plugs, transmission perforation, downhole salvage, production profile testing, etc., while the downhole working fluid in the completion process usually uses water-based working fluid, such as clean water, return fluid or drilling fluid ready-made at the well site for downhole operations, which often makes it difficult to lower the pipe string to the predetermined well depth, reducing the efficiency of on-site construction, and even failing to achieve the expected operation purpose. In addition, the equipment for completion construction usually does not have the ability to mix slurry, and it is difficult to add lubricants or drag reducers such as polymers, greases, powders, etc. that require high-speed shearing to assist in dissolution and dispersion on site, which makes downhole construction difficult.

[0003] In order to reduce the surface friction between the metal well wall and the tubing string in the well, reduce the resistance of the tubing string, and facilitate on-site construction, it is urgent to develop an emulsion-type metal drag reducer to reduce the friction coefficient between the outer wall of the continuous oil pipe and the inner wall of the casing. Summary of the invention

[0004] The present invention provides a metal drag reducing agent for water-based working fluid and a preparation method thereof, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem that during the construction process of water-based working fluid, the existing metal drag reducing agent has poor extreme pressure lubricity and metal wear resistance and cannot reduce the friction resistance demand of downhole pipe strings.

[0005] One of the technical solutions of the present invention is achieved through the following measures: a metal drag reducing agent for water-based working fluid, comprising raw materials, by mass percentage, including 30% to 50% of lubricating base oil, 10% to 20% of water-in-oil emulsifier, 10% to 20% of lubricant, 3% to 5% of anti-wear agent, 5% to 10% of stabilizer, 0.5% to 2% of viscosity enhancer, 0.2% to 0.5% of defoaming agent, 0.5% to 1% of bactericide and the remainder of water.

[0006] The following is a further optimization and / or improvement of one of the above-mentioned technical solutions: The above lubricating base oil is polyether polyol.

[0007] The above-mentioned oil-in-water emulsifier is polyoxyethylene oleyl alcohol ether.

[0008] The lubricant is polyethylene glycol 2000.

[0009] The above-mentioned anti-wear agent is one or more of sulfided isobutylene and halogen anti-wear agent, and the halogen anti-wear agent is calcium chloride alkyl aryl borate.

[0010] The stabilizer is neopentyl polyol higher fatty acid ester.

[0011] The above-mentioned thickener is one or more of xanthan gum and high-viscosity carboxymethyl cellulose.

[0012] The defoamer is a water-based polyurethane defoamer, and the water-based polyurethane defoamer is a water-based polyurethane defoamer DP-251.

[0013] The above-mentioned fungicide is dodecyl dimethyl benzyl ammonium chloride, which is obtained by the reaction of benzyl chloride and dodecyl tertiary amine.

[0014] The metal drag reducing agent for the water-based working fluid is obtained by the following method: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C. to 65° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a rotation speed of 8000 rpm to 10000 rpm for 20 min to 30 min to obtain a metal resistance reducing agent for a water-based working fluid.

[0015] The second technical solution of the present invention is achieved by the following measures: A method for preparing a metal resistance reducing agent for a water-based working fluid is carried out according to the following method: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C. to 65° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a rotation speed of 8000 rpm to 10000 rpm for 20 min to 30 min to obtain a metal resistance reducing agent for a water-based working fluid.

[0016] The metal drag reducer for water-based working fluid of the present invention has good extreme pressure lubricity and metal wear resistance. When applied to downhole operations, it can effectively reduce the friction of downhole pipe strings and reduce the wear of coiled tubing in downhole casings. In addition, the metal drag reducer for water-based working fluid of the present invention has good water solubility and can be used in water-based working fluids such as clean water, potassium chloride salt water, downhole return sewage, etc. It is easy to use on site and can be dispersed by itself without the need for slurry preparation equipment. DETAILED DESCRIPTION

[0017] The present invention is not limited by the following embodiments, and the specific implementation method can be determined according to the technical scheme of the present invention and the actual situation. Unless otherwise specified, the various chemical reagents and chemicals mentioned in the present invention are all chemical reagents and chemicals known and used in the prior art; unless otherwise specified, the percentages in the present invention are all mass percentages; unless otherwise specified, the solutions in the present invention are all aqueous solutions with water as the solvent, for example, hydrochloric acid solution is a hydrochloric acid aqueous solution; the normal temperature and room temperature in the present invention generally refer to a temperature of 15°C to 25°C, and are generally defined as 25°C.

[0018] The present invention will be further described below in conjunction with embodiments: Embodiment 1: The metal drag reducing agent for the water-based working fluid comprises raw materials, which include, by mass percentage, 30% to 50% of lubricating base oil, 10% to 20% of water-in-oil emulsifier, 10% to 20% of lubricant, 3% to 5% of anti-wear agent, 5% to 10% of stabilizer, 0.5% to 2% of viscosity enhancer, 0.2% to 0.5% of defoaming agent, 0.5% to 1% of bactericide and the balance of water.

[0019] Example 2: The metal drag reducing agent for the water-based working fluid comprises raw materials, which include, by mass percentage, 30% or 50% of lubricating base oil, 10% or 20% of water-in-oil emulsifier, 10% or 20% of lubricant, 3% or 5% of anti-wear agent, 5% or 10% of stabilizer, 0.5% or 2% of viscosity enhancer, 0.2% or 0.5% of defoaming agent, 0.5% or 1% of bactericide and the remainder of water.

[0020] Embodiment 3: As an optimization of the above embodiment, the lubricating base oil is polyether polyol.

[0021] Embodiment 4: As an optimization of the above embodiment, the water-in-oil emulsifier is polyoxyethylene oleyl alcohol ether.

[0022] Example 5: As an optimization of the above example, the lubricant is polyethylene glycol 2000.

[0023] Embodiment 6: As an optimization of the above embodiment, the anti-wear agent is one or more of sulfided isobutylene and halogen anti-wear agent, and the halogen anti-wear agent is calcium chloride alkyl aryl borate.

[0024] Example 7: As an optimization of the above example, the stabilizer is neopentyl polyol higher fatty acid ester.

[0025] Example 8: As an optimization of the above example, the thickener is one or more of xanthan gum and high-viscosity carboxymethyl cellulose.

[0026] Example 9: As an optimization of the above example, the defoaming agent is an aqueous polyurethane defoaming agent, and the aqueous polyurethane defoaming agent is an aqueous polyurethane defoaming agent DP-251.

[0027] Example 10: As an optimization of the above example, the fungicide is dodecyl dimethyl benzyl ammonium chloride, which is obtained by reacting benzyl chloride with dodecyl tertiary amine.

[0028] Example 11: As an optimization of the above example, a metal drag reducing agent for a water-based working fluid is obtained by the following method: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C. to 65° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a rotation speed of 8000 rpm to 10000 rpm for 20 min to 30 min to obtain a metal resistance reducing agent for a water-based working fluid.

[0029] The beneficial effects of the metal drag reducer for water-based working fluid of the present invention are as follows: first, it has a good metal lubrication effect and has a significant effect on reducing the friction of the downhole pipe string; second, it has a good metal anti-wear performance, can reduce the wear of the continuous oil pipe in the downhole casing, and further improve the lubrication effect; third, its preparation method is simple to operate, low in cost, safe, environmentally friendly and non-toxic, and can be configured on site; fourth, it has good water solubility and can be used in water-based working fluids such as clean water, potassium chloride brine and downhole return sewage. The metal drag reducer for water-based completion working fluid of the present invention can be added to the completion operation working fluid as required to disperse by itself without the need for slurry preparation equipment.

[0030] Embodiment 12: The metal drag reducing agent for water-based working fluid comprises raw materials, by mass percentage, including 30% of lubricating base oil (polyether polyol), 20% of water-in-oil emulsifier (polyoxyethylene oleyl alcohol ether), 20% of lubricant (polyethylene glycol 2000), 5% of anti-wear agent (sulfurized isobutylene or chlorinated alkyl aryl calcium borate), 5% of stabilizer (neopentyl polyol higher fatty acid ester), 0.5% of viscosity enhancer (xanthan gum or high-viscosity carboxymethyl cellulose), 0.5% of defoamer (water-based polyurethane defoamer DP-251), 1% of bactericide (dodecyl dimethyl benzyl ammonium chloride) and the balance of water, and is obtained by the following method: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a speed of 8000 rpm for 20 minutes to obtain a metal resistance reducing agent for a water-based working fluid, wherein the fungicide, the raw materials include 17% benzyl chloride, 27% dodecyl tertiary amine and the remainder of water by mass percentage, and is obtained by the following method: add the required amount of benzyl chloride and dodecyl tertiary amine to the required amount of water and mix them, react at a temperature of 80°C for 6 hours to obtain the fungicide, i.e., dodecyl dimethyl benzyl ammonium chloride.

[0031] Embodiment 13: The metal drag reducing agent for water-based working fluid comprises raw materials, by mass percentage, including 50% of lubricating base oil (polyether polyol), 10% of water-in-oil emulsifier (polyoxyethylene alcohol ether), 10% of lubricant (polyethylene glycol 2000), 3% of anti-wear agent (sulfurized isobutylene or chlorinated alkyl aryl calcium borate), 10% of stabilizer (neopentyl polyol higher fatty acid ester), 2% of viscosity enhancer (xanthan gum or high-viscosity carboxymethyl cellulose), 0.2% of defoamer (water-based polyurethane defoamer DP-251), 0.5% of bactericide (dodecyl dimethyl benzyl ammonium chloride) and the balance of water, and is obtained by the following method: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir at a speed of 10000 rpm for 30 minutes to obtain a metal resistance reducing agent for a water-based working fluid, wherein the fungicide, the raw materials include 17% benzyl chloride, 27% dodecyl tertiary amine and the remainder of water by mass percentage, and is obtained by the following method: add the required amount of benzyl chloride and dodecyl tertiary amine to the required amount of water, mix, react at a temperature of 80°C for 6 hours, and obtain the fungicide, i.e., dodecyl dimethyl benzyl ammonium chloride.

[0032] Embodiment 14: The metal drag reducing agent for water-based working fluid comprises raw materials, by mass percentage, including 30% of lubricating base oil (polyether polyol), 10% of water-in-oil emulsifier (polyoxyethylene oleyl alcohol ether), 10% of lubricant (polyethylene glycol 2000), 3% of anti-wear agent (sulfurized isobutylene or chlorinated alkyl aryl calcium borate), 10% of stabilizer (neopentyl polyol higher fatty acid ester), 2% of viscosity enhancer (xanthan gum or high-viscosity carboxymethyl cellulose), 0.2% of defoamer (water-based polyurethane defoamer DP-251), 0.5% of bactericide (dodecyl dimethyl benzyl ammonium chloride) and the balance of water, and is obtained by the following method: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a rotation speed of 90000 rpm for 25 minutes to obtain a metal resistance reducing agent for a water-based working fluid, wherein the fungicide, the raw materials include 17% benzyl chloride, 27% dodecyl tertiary amine and the remainder of water by mass percentage, and is obtained by the following method: add the required amount of benzyl chloride and dodecyl tertiary amine to the required amount of water, mix them, react at a temperature of 80°C for 6 hours, and obtain the fungicide, i.e., dodecyl dimethyl benzyl ammonium chloride.

[0033] Comparative Example 1: The existing metal resistance reducing agent adopts polyacrylamide.

[0034] Comparative Example 2: The difference from Example 13 of the present invention is that the raw material "water-in-oil emulsifier (polyoxyethylene oleyl alcohol ether)" in the water-based working fluid metal drag reducer is replaced by "water-in-oil emulsifier (sodium dodecylbenzene sulfonate)", and the remaining steps are the same.

[0035] Comparative Example 3: The difference from Example 13 of the present invention is that the missing raw material "lubricant (polyethylene glycol 2000)" in the metal drag reducing agent for the water-based working fluid is used, and the remaining steps are the same.

[0036] Experimental Example 1: The performance of the metal drag reducing agent for water-based working fluid of the present invention was investigated.

[0037] Experimental method: The metal drag reducing agent for water-based working fluid prepared in Examples 12 to 14 of the present invention was placed in clean water or potassium chloride brine with a mass concentration of 10%, and the addition amount was 1%, 2% and 3% respectively, and the extreme pressure lubrication performance of the metal drag reducing agent for water-based working fluid prepared in Examples 12 to 14 of the present invention was investigated. The extreme pressure lubrication performance includes the extreme pressure lubrication coefficient and the extreme pressure lubrication coefficient reduction rate. At the same time, Comparative Examples 1 to 3 of the present invention were used as controls.

[0038] Experimental results: The extreme pressure lubrication performance results of the metal drag reducer for water-based working fluid of the present invention are shown in Table 1. As can be seen from Table 1, compared with the data of Comparative Examples 1 to 3, the extreme pressure lubrication coefficient of the metal drag reducer for water-based working fluid of the present invention is lower in clean water and potassium chloride salt water with a mass concentration of 10%. When the addition amount of the metal drag reducer for water-based working fluid of the present invention is 3%, the reduction rate of the extreme pressure lubrication coefficient exceeds 90%, and the lubrication performance is significant. It shows that the metal drag reducer for water-based working fluid of the present invention has a good extreme pressure lubrication effect.

[0039] Experimental Example 1: The metal anti-wear performance of the metal resistance reducing agent for the water-based working fluid of the present invention was investigated.

[0040] Experimental method: The metal drag reducing agent for water-based working fluid prepared in Example 12 of the present invention is placed in clean water, and the addition amounts of the metal drag reducing agent for water-based working fluid are 0.5%, 1.0% and 1.5%, respectively, to investigate the metal anti-wear performance of the metal drag reducing agent for water-based working fluid of the present invention.

[0041] Experimental results: The metal anti-wear performance results of the metal drag reducer for water-based working fluid prepared in Example 12 of the present invention are shown in Table 2. It can be seen from Table 2 that when the addition amount of the metal drag reducer for water-based working fluid prepared in Example 12 of the present invention is 0.5%, the load capacity (mass of load weight) is increased by 4.4 times compared with clean water, and the load capacity is significantly improved with the increase of the addition amount. At the same time, the metal drag reducer for water-based working fluid prepared in Example 12 of the present invention can effectively reduce the wear on the surface of the metal slider, and the wear spot length can be reduced to 28.5% of the clean water medium. It shows that the metal drag reducer for water-based working fluid of the present invention has good metal anti-wear and the ability to increase the load of the friction interface. Therefore, the metal drag reducer for water-based working fluid of the present invention is applied to downhole operations, which can effectively reduce the friction resistance of the downhole tubing, and at the same time, it can reduce the wear of the continuous oil pipe in the downhole casing.

[0042] In summary, the metal drag reducer for water-based working fluid of the present invention has good extreme pressure lubricity and metal wear resistance. When applied to downhole operations, it can effectively reduce the friction of downhole pipe strings and reduce the wear of coiled tubing in downhole casings. In addition, the metal drag reducer for water-based working fluid of the present invention has good water solubility and can be used in water-based working fluids such as clean water, potassium chloride brine, downhole backwash sewage, etc. It is easy to use on site and can be dispersed by itself without the need for slurry preparation equipment.

[0043] 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.

Claims

1. A metal drag reducing agent for water-based working fluid, characterized in that The raw materials include, by mass percentage, 30% to 50% lubricating base oil, 10% to 20% water-in-oil emulsifier, 10% to 20% lubricant, 3% to 5% anti-wear agent, 5% to 10% stabilizer, 0.5% to 2% viscosity enhancer, 0.2% to 0.5% defoaming agent, 0.5% to 1% bactericide and the balance water.

2. The metal drag reducing agent for water-based working fluid according to claim 1, characterized in that The lubricating base oil is polyether polyol; or / and the water-in-oil emulsifier is polyoxyethylene oleyl alcohol ether.

3. The metal drag reducing agent for water-based working fluid according to claim 1 or 2, characterized in that The lubricant is polyethylene glycol 2000.

4. The metal drag reducing agent for water-based working fluid according to claim 1, 2 or 3, characterized in that The anti-wear agent is one or more of sulfided isobutylene and halogen anti-wear agent, and the halogen anti-wear agent is calcium chloride alkyl aryl borate.

5. The metal drag reducing agent for water-based working fluid according to any one of claims 1 to 4, characterized in that The stabilizer is neopentyl polyol higher fatty acid ester.

6. The metal drag reducing agent for water-based working fluid according to any one of claims 1 to 5, characterized in that The thickener is one or more of xanthan gum and high-viscosity carboxymethyl cellulose.

7. The metal drag reducing agent for water-based working fluid according to any one of claims 1 to 6, characterized in that The defoamer is a water-based polyurethane defoamer.

8. The metal drag reducing agent for water-based working fluid according to any one of claims 1 to 7, characterized in that The fungicide is dodecyl dimethyl benzyl ammonium chloride, which is obtained by reacting benzyl chloride with dodecyl tertiary amine.

9. The metal drag reducing agent for water-based working fluid according to any one of claims 1 to 8, characterized in that Obtained as follows: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C. to 65° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a rotation speed of 8000 rpm to 10000 rpm for 20 min to 30 min to obtain a metal resistance reducing agent for a water-based working fluid.

10. A method for preparing a metal drag reducing agent for a water-based working fluid according to any one of claims 1 to 8, characterized in that Proceed as follows: The first step is to add a required amount of a thickener to a required amount of water and mix until the mixture is completely swollen to obtain a mixed material a; The second step is to add the required amount of water-in-oil emulsifier and defoamer to the mixed material a and stir until uniform to obtain a mixed material b; The third step is to heat the mixed material b to 60° C. to 65° C., and then sequentially add the required amount of lubricating base oil, lubricant, anti-wear agent and stabilizer and stir until uniform to obtain a mixed material c; The fourth step is to add the required amount of fungicide to the mixed material c, and stir it at a rotation speed of 8000 rpm to 10000 rpm for 20 min to 30 min to obtain a metal resistance reducing agent for a water-based working fluid.

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