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A kind of environment-friendly high-performance coating inhibitor and its preparation method and application

A coating inhibitor, high-performance technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of the coating inhibition effect needs to be further strengthened, the complete dissolution time is long, and the mud filtration volume increases. , to achieve the effect of outstanding environmental protection performance, easy filtration and purification, and low production energy consumption

Active Publication Date: 2021-01-29
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of coating inhibitor has the ability to coat the cuttings and prevent the hydration and dispersion of the cuttings, but the high molecular weight coating inhibitor causes the system viscosity to increase when used (Fan Yufu, Journal of Shengli College, China University of Petroleum, 2008, 22 (1): 4-5), and excessive flocculation is prone to occur, resulting in an increase in mud filtration loss and unstable mud performance; and due to the large molecular weight, when the powdery coated inhibitor dissolves, it is easy to form mutually difficult to dissolve Agglomerates, it takes a long time to completely dissolve, and the speed is slow, which seriously affects the construction progress
Polymers with relatively low molecular weight have a short dissolution time and can meet the requirements of on-site operations, such as the ULTRACAP products of foreign Microbar companies, but they are expensive and used in large quantities, resulting in high drilling fluid costs
On the other hand, there are a lot of silicon hydroxyl groups on the surface of shale, drilling cuttings and clay, and the general polyacrylamide coating inhibitors lack groups that can interact with them in the molecular structure, and the coating inhibition effect needs to be further strengthened
[0004] In addition, the current common process for polymer synthesis is emulsion polymerization, which is difficult to purify and requires the addition of refractory demulsifiers

Method used

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  • A kind of environment-friendly high-performance coating inhibitor and its preparation method and application
  • A kind of environment-friendly high-performance coating inhibitor and its preparation method and application
  • A kind of environment-friendly high-performance coating inhibitor and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) First add 800kg of distilled water, 400kg of isopropanol and 700kg of ethylene glycol into the reaction kettle, stir to mix evenly, and use it as a polymerization solvent for later use.

[0039](2) Add 475 kg of the first monomer N, N-dimethylacrylamide and 325 kg of 2-acrylamido-2-methylpropanesulfonic acid, and the second monomer N-(3-aminopropyl) methyl Acrylic acid ammonium salt 320kg, the third monomer 1-vinyl-2-pyrrolidone 60kg, initiator pentaerythritol 2.0kg, and dispersion stabilizer polyoxyethylene diamine 16kg, add in (1), stir to make it dissolve completely, then 2.0 kg of initiator ammonium persulfate was dissolved in 100 kg of distilled water and placed in a constant pressure dropping funnel; ammonia water was added to adjust the pH of the solution to 8.5. Introduce nitrogen protection into the reaction kettle and keep it for 30 minutes; then start to add ammonium persulfate aqueous solution dropwise and complete the dropwise addition within 15-25 minu...

Embodiment 2

[0041] (1) Add 700kg of distilled water, 600kg of isopropanol and 600kg of ethylene glycol into the reaction kettle, stir to mix evenly, and set aside as a polymerization solvent.

[0042] (2) the first monomer N, N'-(1,2-dihydroxyethylene) diacrylamide 410kg and 2-acrylamido-2-methylpropanesulfonic acid 300kg, the second monomer N-( 3-aminopropyl) methacrylic acid sodium salt 400kg, the third monomer 1-vinyl-2-pyrrolidone 14kg, initiator sodium persulfate 1.0kg, and dispersion stabilizer dimethyl diallyl ammonium chloride / Add 54 kg of acrylamide copolymer into (1), stir to make it dissolve completely, then dissolve 1.0 kg of the initiator sodium bisulfite in 100 kg of distilled water, and place it in a constant-pressure dropping funnel; add ammonia water to adjust the pH of the solution to 8.5. Introduce nitrogen protection into the reaction kettle and keep it for 30 minutes; then start to add aqueous sodium bisulfite solution dropwise and complete the dropwise addition wit...

Embodiment 3

[0044] (1) First add 840kg of distilled water, 560kg of ethylene glycol and 500kg of isopropanol into the reaction kettle, stir to mix evenly, and use it as a polymerization solvent for later use.

[0045] (2) N, N'-(1,2-dihydroxyethylene) diacrylamide 455kg and 2-acrylamido-2-methylpropanesulfonic acid 305kg, the second monomer N-(3-aminopropyl base) methacrylate ammonium salt 346kg, the third monomer 1-vinyl-2-pyrrolidone 50.4kg, initiator sodium persulfate 1.8kg, and dispersion stabilizer maleimide-based polyethylene glycol monomethyl ether 40kg , add in (1), stir to make it dissolve completely, then dissolve 1.8kg of initiator sodium bisulfite in 100kg of distilled water, place in a constant pressure dropping funnel; add ammonia water to adjust the pH value of the solution to 8.5. Introduce nitrogen protection into the reaction kettle and keep it for 30 minutes; then start to add aqueous sodium bisulfite solution dropwise, and complete the dropwise addition within 15-25 mi...

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Abstract

The invention discloses an environment-friendly high-performance coating inhibitor, wherein the environment-friendly high-performance coating inhibitor is dispersed in an alcohol-water mixed solvent by first monomer, second monomer, third monomer and initiator It can be prepared by dispersion polymerization under the action of stabilizer. In addition, a preparation method is also disclosed. The coating inhibitor product provided by the present invention has both excellent coating inhibition and fluid loss control, and has dual inhibition effects of amine-based multi-point adsorption and polymer chain coating drilling cuttings, forming a layer of protection on the cuttings surface. The membrane can effectively inhibit the hydration and dispersion of clay and drilling cuttings, stabilize the well wall and quickly remove harmful solid phases. In addition, this product has good shear thinning property, which can improve the rheology of drilling fluid; it can withstand temperature up to 160°C, can resist compound brine, is non-toxic and non-fluorescent, and is suitable for exploration wells and drilling environments with high environmental protection requirements.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling products, in particular to an environmentally friendly and high-performance coating inhibitor with excellent inhibitory performance, a preparation method and application thereof. Background technique [0002] Coating inhibitor is an important component of drilling fluid. The addition of coating inhibitor can prevent the dispersion of clay and drilling cuttings. Its molecules can quickly adhere to the surface of drilling cuttings and clay, and play the role of coating and inhibiting dispersion. Function, and can also form internal and external mud cakes on the well wall to reduce pressure difference transmission and filtrate penetration. The coating inhibitor can effectively inhibit the hydration and dispersion of drilling cuttings and the borehole wall, so as to maintain the stability of the borehole wall, remove useless solid phase, and maintain low solid phase. [0003] At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/54C08F222/38C08F220/58C08F220/06C08F226/10
CPCC08F220/54C08F222/385C09K8/035C08F220/585C08F220/06C08F226/10
Inventor 耿铁孙保明郭磊孙黎王伟国文月罗健生苗海龙赖全勇张伟国
Owner CHINA NAT OFFSHORE OIL CORP