Preparation method of high-temperature-resistant environment-friendly oil-based drilling lubricant

Abstract

The invention belongs to the field of oilfield chemical treatment agents, and particularly relates to a preparation method of a high-temperature-resistant environment-friendly oil-based drilling lubricant, which comprises the following steps: adding 65-80 parts of methanol, 570-710 parts of hydrogenated coconut oil and 10-16 parts of sodium hydroxide into a reactor, and introducing nitrogen into the reactor; the reactor is stirred and heated, the temperature is 120-130 DEG C, and the reaction time is 10 hours; and after the reaction is finished, cooling to 50-60 DEG C, adding 51-97 parts of Tween 20 and 68-103 parts of an emulsifier into the reactor, stirring for 30 minutes, cooling to 30-40 DEG C, and discharging. The emulsifier is prepared from oleic acid and diethanol amine. The prepared oil-based drilling lubricant is good in lubricating property, high in biodegradation rate and good in temperature-resistant effect. The lubricating coefficient reduction rate is higher than 93%, the lubricating coefficient reduction rate after high temperature is higher than 87%, and compared with an existing drilling lubricant, the lubricating effect is obvious.

Description

Technical Field

[0001] The present invention belongs to the field of oilfield chemical treatment agents, and particularly relates to a preparation method of a high-temperature resistant and environmentally friendly oil-based drilling lubricant. Background Art

[0002] At present, there are various types of commonly used drilling fluid lubricants. Liquid lubricants are divided into mineral oil lubricants and vegetable oil lubricants, both of which mainly aim to increase the torque reduction rate. The main components of mineral oil lubricants are crude oil, diesel oil or white oil. Although these oils have good lubrication performance, due to factors such as containing aromatics, low flash point, and difficult degradation, there are environmental pollution and safety hazards in the production and use processes. The main components of vegetable oil lubricants are cottonseed oil, rapeseed oil, etc. Although they are relatively easy to degrade and more environmentally friendly, their high-temperature stability is poor, the anti-temperature performance is not good, the high temperature is only 120 °C, and the lubrication performance is also poor, the lubrication effect is not good, especially the reduction rate of the lubrication coefficient after high temperature is less than 44%. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a preparation method of a high-temperature resistant and environmentally friendly oil-based drilling lubricant. The prepared oil-based drilling lubricant has good lubrication performance, high biodegradation rate, and good anti-temperature effect.

[0004] The technical solution adopted by the present invention is: a preparation method of a high-temperature resistant and environmentally friendly oil-based drilling lubricant. The preparation method is as follows: Add 65 - 80 parts of methanol, 570 - 710 parts of hydrogenated coconut oil, and 10 - 16 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, the temperature is 120 - 130 °C, and the reaction time is 10 hours; After the reaction is completed, cool down to 50 - 60 °C, then add 51 - 97 parts of Tween 20 and 68 - 103 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C and discharge, thus obtaining the high-temperature resistant and environmentally friendly oil-based drilling lubricant; The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is as follows: After introducing nitrogen into the reactor, react 272 - 292 parts of oleic acid and 95 - 115 parts of diethanolamine at a temperature of 190 - 200 °C for 8 hours to obtain the emulsifier.

[0005] The beneficial effects of the present invention: It provides a preparation method of a high-temperature resistant and environmentally friendly oil-based drilling lubricant. The preparation method is simple and easy to prepare. The prepared oil-based drilling lubricant has good lubrication performance, high biodegradation rate, and good anti-temperature effect. Its reduction rate of the lubrication coefficient is higher than 93%, and the reduction rate of the lubrication coefficient after high temperature is higher than 87%. Compared with the existing drilling lubricants, the lubrication effect is obvious. Detailed Embodiments Examples

[0006] The preparation method of a high-temperature resistant and environment-friendly oil-based drilling lubricant is as follows: Add 72.5 parts of methanol, 640 parts of hydrogenated coconut oil, and 13 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction ends, cool down to 50 - 60 °C, then add 74 parts of Tween 20 and 85.5 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C and discharge, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant I. The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is: After introducing nitrogen into the reactor with 282 parts of oleic acid and 105 parts of diethanolamine, react at a temperature of 190 - 200 °C for 8 hours to obtain the emulsifier. The reaction formula is: RCOOH + HN(C2H5OH)2 RCON(C2H5OH)2 + H2O Example

[0007] The preparation method of a high-temperature resistant and environment-friendly oil-based drilling lubricant is as follows: Add 65 parts of methanol, 570 parts of hydrogenated coconut oil, and 10 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction ends, cool down to 50 - 60 °C, then add 51 parts of Tween 20 and 68 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C and discharge, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant II. The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is: After introducing nitrogen into the reactor with 272 parts of oleic acid and 95 parts of diethanolamine, react at a temperature of 190 - 200 °C for 8 hours to obtain the emulsifier. Example

[0008] The preparation method of a high-temperature resistant and environment-friendly oil-based drilling lubricant is as follows: Add 80 parts of methanol, 710 parts of hydrogenated coconut oil, and 16 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction ends, cool down to 50 - 60 °C, then add 97 parts of Tween 20 and 103 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C and discharge, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant III. The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is: After introducing nitrogen into the reactor with 292 parts of oleic acid and 115 parts of diethanolamine, react at a temperature of 190 - 200 °C for 8 hours to obtain the emulsifier. Example

[0009] Measurement of the reduction rate of lubrication coefficient and the reduction rate of high-temperature lubrication coefficient Step 1: Take 8 high-speed stirring cups, add 400 mL of distilled water, 20 g of sodium bentonite and 0.8 g of anhydrous sodium carbonate into each cup respectively. After high-speed stirring for 20 min on a high-speed stirrer, seal and cure the 8 cups of slurry at a temperature of 24°C ± 3°C for 24 h to obtain the base slurry, which is reserved for later use.

[0010] Step 2: Take 4 portions of the cured base slurry, each with a volume of 400 mL. Add 1 portion of the base slurry into a high-speed stirring cup, stir at high speed for 5 min, then measure the lubrication coefficient of the base slurry and record it. The other 3 portions of the base slurry are used to prepare the sample-added slurries. First, add 1 portion of the base slurry into a high-speed stirring cup, add 2 mL of high-temperature resistant and environmentally friendly oil-based drilling lubricant I (Sample No. 1) to the base slurry, and stir at high speed for 5 min to obtain the Sample No. 1-added slurry. Measure its lubrication coefficient and record it. Clean the high-speed stirring cup. Then, add another portion of the base slurry into the high-speed stirring cup, add 2 mL of high-temperature resistant and environmentally friendly oil-based drilling lubricant II (Sample No. 2) to the base slurry, and stir at high speed for 5 min to obtain the Sample No. 2-added slurry. Measure its lubrication coefficient and record it. Clean the high-speed stirring cup. Add the last portion of the base slurry into the high-speed stirring cup, add 2 mL of high-temperature resistant and environmentally friendly oil-based drilling lubricant III (Sample No. 3) to the base slurry, and stir at high speed for 5 min to obtain the Sample No. 3-added slurry. Measure its lubrication coefficient and record it.

[0011] Step 3: Calculate the reduction rate of lubrication coefficient The calculation formula (3) for the reduction rate of lubrication coefficient is as follows: In the formula, η c is the reduction rate of lubrication coefficient, expressed as a percentage (%); ω is the lubrication coefficient of the base slurry; ω c is the lubrication coefficient of the sample-added slurry. Calculate the reduction rates of lubrication coefficient of the Sample No. 1-added slurry, Sample No. 2-added slurry and Sample No. 3-added slurry respectively according to this formula and record them.

[0012] Step 4: Take another 4 portions of the cured base slurry, each portion being 400 mL, for standby. Take the 1st portion of the base slurry and add it to a high-speed stirring cup. After high-speed stirring for 5 minutes, pour the base slurry into a curing tank, and place it in a high-temperature roller furnace at 180 °C and roll for 16 h. Then take it out and cool it to room temperature. Then pour it back into the high-speed stirring cup, stir at high speed for 5 minutes, and measure the lubrication coefficient of the base slurry after high temperature, and make a record. Take the 2nd portion of the base slurry and add it to the high-speed stirring cup. Add 2 mL of high-temperature resistant and environmentally friendly oil-based drilling lubricant I (Sample I) to the base slurry. After high-speed stirring for 5 minutes, pour it into the curing tank, and place it in a high-temperature roller furnace at 180 °C and roll for 16 h. Then take it out and cool it to room temperature. Then pour it back into the high-speed stirring cup, stir at high speed for 5 minutes to obtain Sample I added slurry. Measure the lubrication coefficient of the added slurry after high temperature, and make a record. Take the 3rd portion of the base slurry and add it to the high-speed stirring cup. Add 2 mL of high-temperature resistant and environmentally friendly oil-based drilling lubricant II (Sample II) to the base slurry. After high-speed stirring for 5 minutes, pour it into the curing tank, and place it in a high-temperature roller furnace at 180 °C and roll for 16 h. Then take it out and cool it to room temperature. Then pour it back into the high-speed stirring cup, stir at high speed for 5 minutes to obtain Sample II added slurry. Measure the lubrication coefficient of the added slurry after high temperature, and make a record. Take the 4th portion of the base slurry and add it to the high-speed stirring cup. Add 2 mL of high-temperature resistant and environmentally friendly oil-based drilling lubricant III (Sample III) to the base slurry. After high-speed stirring for 5 minutes, pour it into the curing tank, and place it in a high-temperature roller furnace at 180 °C and roll for 16 h. Then take it out and cool it to room temperature. Then pour it back into the high-speed stirring cup, stir at high speed for 5 minutes to obtain Sample III added slurry. Measure the lubrication coefficient of the added slurry after high temperature, and make a record.

[0013] Step 5: Calculate the reduction rate of the lubrication coefficient after high temperature The calculation formula (3) for the reduction rate of the lubrication coefficient after high temperature is: In the formula, η c is the reduction rate of the lubrication coefficient after high temperature, expressed as a percentage (%); ω is the lubrication coefficient of the base slurry after high temperature; ω c is the lubrication coefficient of the added slurry after high temperature. Calculate the reduction rates of the lubrication coefficients of Sample I added slurry, Sample II added slurry and Sample III added slurry after high temperature respectively according to this formula, and make records.

[0014] Comparison table of the reduction rates of the lubrication coefficients between the high-temperature resistant and environmentally friendly oil-based drilling lubricant and the existing drilling lubricants From the experimental results in the above application examples, it can be seen that the reduction rate of the lubrication coefficient of the high-temperature resistant and environmentally friendly oil-based drilling lubricant is higher than 93%, and the reduction rate of the lubrication coefficient after high temperature is higher than 87%. Compared with the existing drilling lubricants, the lubrication effect of the high-temperature resistant and environmentally friendly oil-based drilling lubricant prepared by the present method has been significantly improved.

[0015] The above embodiments are only partial exemplary embodiments of the present invention, not all embodiments and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A preparation method of a high-temperature resistant and environmentally friendly oil-based drilling lubricant, characterized in that: The preparation method is as follows: Add 65 - 80 parts of methanol, 570 - 710 parts of hydrogenated coconut oil, and 10 - 16 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction is completed, cool down to 50 - 60 °C, then add 51 - 97 parts of Tween 20 and 68 - 103 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C for discharging, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant.

2. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to claim 1, characterized in that: The preparation method is as follows: Add 72.5 parts of methanol, 640 parts of hydrogenated coconut oil, and 13 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction is completed, cool down to 50 - 60 °C, then add 74 parts of Tween 20 and 85.5 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C for discharging, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant.

3. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to claim 1, wherein: The preparation method is as follows: Add 65 parts of methanol, 570 parts of hydrogenated coconut oil, and 10 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction is completed, cool down to 50 - 60 °C, then add 51 parts of Tween 20 and 68 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C for discharging, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant.

4. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to claim 1, wherein: The preparation method is as follows: Add 80 parts of methanol, 710 parts of hydrogenated coconut oil, and 16 parts of sodium hydroxide into a reactor, and introduce nitrogen into the reactor; Stir and heat up the reactor, with the temperature being 120 - 130 °C and the reaction time being 10 hours; After the reaction is completed, cool down to 50 - 60 °C, then add 97 parts of Tween 20 and 103 parts of emulsifier into the reactor, stir for 30 minutes, and then cool down to 30 - 40 °C for discharging, thus obtaining the high-temperature resistant and environment-friendly oil-based drilling lubricant.

5. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to any one of claims 1-4, characterized in that: The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is as follows: After introducing nitrogen into the reactor, add 272 - 292 parts of oleic acid and 95 - 115 parts of diethanolamine, and react at 190 - 200 °C for 8 hours to obtain the emulsifier.

6. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to claim 5, wherein: The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is as follows: After introducing nitrogen into the reactor, add 282 parts of oleic acid and 105 parts of diethanolamine, and react at 190 - 200 °C for 8 hours to obtain the emulsifier.

7. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to claim 5, characterized in that: The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is as follows: After introducing nitrogen into the reactor, add 272 parts of oleic acid and 95 parts of diethanolamine, and react at 190 - 200 °C for 8 hours to obtain the emulsifier.

8. The preparation method of the high-temperature resistant and environment-friendly oil-based drilling lubricant according to claim 5, characterized in that: The emulsifier is prepared from oleic acid and diethanolamine. The preparation method of the emulsifier is as follows: After introducing nitrogen into a reactor with 292 parts of oleic acid and 115 parts of diethanolamine, react at a temperature of 190 - 200 °C for 8 hours to obtain the emulsifier.

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