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Environment-friendly inhibitor for drilling fluid, and preparation method thereof

An inhibitor and drilling fluid technology, applied in the field of drilling fluids, can solve the problems of non-standard environmental protection requirements of commonly used inhibitors, pollute the environment, and be difficult to desorb, and achieve excellent environmental protection advantages, strengthen the inhibition effect, and improve the effect of stability.

Pending Publication Date: 2020-05-29
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide an environmental protection inhibitor for drilling fluid and its preparation method, which has excellent clay hydration expansion and dispersion inhibition effects, can be firmly adsorbed on the clay surface, and is not easy to desorb. It has a long-term inhibitory effect, and the product is made of environmentally friendly materials, which is environmentally friendly and easy to degrade. It meets the requirements of the national environmental protection law and solves the problems of common inhibitors that do not meet the environmental protection requirements, are difficult to degrade, and pollute the environment.

Method used

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  • Environment-friendly inhibitor for drilling fluid, and preparation method thereof
  • Environment-friendly inhibitor for drilling fluid, and preparation method thereof
  • Environment-friendly inhibitor for drilling fluid, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 35 parts of amino acid, 5 parts of strong base, and 70 parts of water into the reaction kettle in turn, and heat up to 70°C while stirring to carry out neutralization reaction to form amino acid salt. The reaction time is 1.5 hours, and then slowly add 23 parts of phosphoric acid, while stirring. Raise the temperature to 150°C to phosphorylate the amino acid salt, continue the reaction for 6 hours, then cool down to 70°C, add 15 parts of choline and 12 parts of urea in turn to physically mix with the amino acid phosphate in the reaction kettle, stir evenly for 1.5 hours, and mix well After cooling to room temperature through cooling water circulation, the target product can be obtained.

[0030] Preferably, the amino acid is a mixture of arginine and histidine;

[0031] Preferably, arginine and histidine are mixed according to the mass ratio of 45 parts: 55 parts;

[0032] Preferably, the strong base is caustic potash;

[0033] Preferably, choline is choline chlor...

Embodiment 2

[0036] Add 30 parts of amino acid, 4 parts of strong base, and 50 parts of water into the reaction kettle in sequence, and heat up to 55°C while stirring to carry out neutralization reaction to form amino acid salt. The reaction time is 1 hour, then slowly add 20 parts of phosphoric acid, and heat up while stirring Phosphorylate the amino acid salt at 160°C, continue the reaction for 4 hours, then lower the temperature to 70°C, add 20 parts of choline, 10 parts of urea and the amino acid phosphate in the reaction kettle in order to physically mix, stir evenly for 1 hour, and pass through after mixing evenly. Cooling water was circulated to cool down to room temperature to obtain the target product.

[0037] Preferably, the amino acid is a mixture of arginine and threonine;

[0038] Preferably, arginine and threonine are mixed according to the mass ratio of 60 parts: 40 parts;

[0039] Preferably, the strong base is caustic soda;

[0040] Preferably, choline is choline chlori...

Embodiment 3

[0043] Add 25 parts of amino acid, 3 parts of strong base, and 50 parts of water into the reaction kettle in sequence, and heat up to 50°C while stirring to carry out neutralization reaction to form amino acid salt. The reaction time is 2 hours, then slowly add 15 parts of phosphoric acid, and heat up while stirring Phosphorylate the amino acid salt at 140°C, continue the reaction for 5 hours, then lower the temperature to 80°C, add 10 parts of choline, 7 parts of urea and the amino acid phosphate in the reaction kettle for physical mixing, stir evenly for 1 hour, and pass through after mixing evenly. Cooling water was circulated to cool down to room temperature to obtain the target product.

[0044] Preferably, the amino acid is a mixture of arginine, glutamic acid and glycine;

[0045] Preferably, arginine, glutamic acid and glycine are mixed according to the mass ratio of 40 parts: 30 parts: 30 parts;

[0046] Preferably, the strong base is caustic soda;

[0047] Preferab...

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Abstract

The invention discloses an environment-friendly inhibitor for a drilling fluid, and a preparation method thereof, and relates to the field of drilling fluids in petroleum and natural gas and geological exploration and development. The environment-friendly inhibitor for the drilling fluid is prepared from, by mass, 25 to 35 parts of amino acids, 3 to 5 parts of a strong base, 15 to 25 parts of phosphoric acid, 10 to 20 parts of choline, 7 to 12 parts of urea and 50 to 70 parts of water. The inhibitor has excellent clay hydration expansion and dispersion inhibition effects, can be firmly adsorbed on the surface of clay, is not prone to desorbing, has a long-acting inhibition effect, is completely made of environment-friendly materials, is environment-friendly and easy to degrade, meets the requirements of national environmental protection laws, solves the problems that common inhibitors do not meet the environmental protection requirements and are difficult to degrade, and is suitable for mining operation in part of domestic severe ocean areas.

Description

technical field [0001] The invention relates to the field of drilling fluid in petroleum and natural gas and geological exploration and development, in particular to an environment-friendly inhibitor for drilling fluid and a preparation method thereof. Background technique [0002] In recent years, oil exploration and development are constantly developing towards extended-reach wells, horizontal wells, and ocean drilling. During the drilling process, well collapse and diameter shrinkage caused by well wall instability can easily lead to downhole drilling, stuck pumps, and increased torque. Complicated situations will seriously affect the drilling speed and may even cause the well to be scrapped; at the same time, with the implementation of new environmental protection regulations, the environmental protection requirements for drilling fluid treatment agents in land, ocean and other fields are becoming more and more stringent. The commonly used inhibitors are polyamines , sma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/14C05G1/00
CPCC05B15/00C09K8/03C09K8/14C09K2208/12C05C9/00C05C11/00
Inventor 董平华谢涛许杰刘阳韩亮孙连坡王伟苗海龙陈强杨洁
Owner CHINA NAT OFFSHORE OIL CORP
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