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Six-claw drilling fluid coating agent and preparation method thereof

A coating agent and drilling fluid technology, applied in the field of six-claw drilling fluid coating agent and its preparation, can solve the problems of poor coating performance, poor temperature resistance and poor stability of the coating agent

Active Publication Date: 2021-09-10
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing coating agent has poor coating performance, poor temperature resistance, and poor stability. Aiming at the defects in the prior art, a six-claw drilling fluid coating agent and its Preparation

Method used

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  • Six-claw drilling fluid coating agent and preparation method thereof
  • Six-claw drilling fluid coating agent and preparation method thereof
  • Six-claw drilling fluid coating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In this example, the six-claw prepolymer and the six-claw drilling fluid coating agent were prepared by the following method

[0057] Six claw prepolymer preparation:

[0058] (1) Rotate ε-caprolactone at 50°C and pressure -0.08MPa for 1 hour, and set aside; add 180 parts of cyclohexanehexanol, 685 parts of ε-caprolactone, and cyclohexanehexa The molar ratio of alcohol to ε-caprolactone is 1:6, 3.46 parts of dibutyltin, after 20 minutes of nitrogen gas, it is sealed, and the temperature is raised to 210°C through the electric heating temperature control system, and the reaction is 5h, and the hexaclaw-shaped hydroxyl-terminated polycaprolactone is obtained. ester.

[0059] (2) Add 100 parts of hexapod-shaped hydroxyl-terminated polycaprolactone, 50 parts of acrylic acid, 67.5 parts of toluene, and 0.01 part of p-hydroxyanisole into a reaction kettle with stirring, condensing reflux and a thermometer, and feed oxygen into it. Raise the temperature by an electric heatin...

Embodiment 2

[0064] In this example, the six-claw prepolymer and the six-claw drilling fluid coating agent were prepared by the following method

[0065] Six claw prepolymer preparation:

[0066] (1) Rotate ε-caprolactone at 50°C and pressure -0.1MPa for 1 hour, and set aside; add 180 parts of cyclohexanol, 753 parts of ε-caprolactone, and cyclohexa The molar ratio of alcohol to ε-caprolactone is 1:6.6, 5.6 parts of dibutyltin dilaurate, after 20 minutes of nitrogen gas, it is sealed, and the temperature is raised to 210°C through an electric heating temperature control system, and the reaction is 5 hours to obtain a six-claw-shaped terminal hydroxyl group Polycaprolactone.

[0067] (2) Add 100 parts of hexapod-shaped hydroxyl-terminated polycaprolactone, 60 parts of acrylic acid, 88 parts of toluene, and 0.02 parts of p-hydroxyanisole into a reaction kettle with stirring, condensing reflux and a thermometer, and feed in oxygen. Raise the temperature by an electric heating temperature co...

Embodiment 3

[0072] In this example, the six-claw prepolymer and the six-claw drilling fluid coating agent were prepared by the following method

[0073] Six claw prepolymer preparation:

[0074] The preparation process of the six-claw prepolymer is completely consistent with that of Example 1.

[0075] Preparation of six-claw drilling fluid coating agent:

[0076] The preparation of the six-claw drilling fluid coating agent consists of the following raw materials in parts by weight: 30 parts of acrylamide, 6 parts of six-claw prepolymer, N - 120 parts of vinylpyrrolidone, 150 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1788 polyvinyl alcohol (1788 means that the degree of polymerization of polyvinyl alcohol is 1700, and the degree of alcoholysis is 88) 20 parts, chlorine 8 parts of 2-hydroxy-3-(trimethylamino)propyl polyethylene oxide cellulose ether, 41 parts of potassium hydroxide, 580 parts of water, 3 parts of azobisisobutyronitrile, tert-butyl hydroperoxide 1.5 parts, sodi...

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Abstract

The invention relates to the technical field of oil-gas field development, and provides a six-claw drilling fluid coating agent and a preparation method thereof. The six-claw drilling fluid coating agent is prepared through a polymerization reaction. The preparation raw materials of the polymerization reaction comprise the following components in parts by weight: 10 to 30 parts of acrylamide, 3 to 6 parts of six-claw prepolymer, 80 to 120 parts of N-vinyl pyrrolidone, 100 to 150 parts of 2-acrylamide-2-methylpropanesulfonic acid, 10 to 20 parts of polyvinyl alcohol, 3 to 8 parts of a conditioner, 27 to 41 parts of potassium hydroxide, 580 to 720 parts of water, 1 to 3 parts of a high-temperature initiator and 0.5 to 3 parts of a medium-temperature initiator. A molecular chain of the coating agent has a six-claw structure, so the coating agent can realize rapid adsorption of the clay surface and coating of drilling cuttings, and has strong and lasting coating capability; and each branch chain of the coating agent has a large number of sulfonic acid groups and five-membered ring structures, so that the coating agent has more excellent temperature resistance, and the temperature resistance can reach 230 DEG C.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a six-claw drilling fluid coating agent and a preparation method thereof. Background technique [0002] Coating agent is a commonly used additive in water-based drilling fluid. It is mainly adsorbed on the cuttings and the surface of the well wall by coating, inhibiting the dispersion of cuttings and maintaining the stability of the well wall. It also has the effect of adjusting the flow pattern and reducing water loss. Currently commonly used coating agents are polyacrylamide polymers, such as KPAM, FA367, and cationic coating agent ULTRACAP of Microbar Company. These coating agents have good application effects in shale formations, but they are commonly The disadvantage of poor temperature resistance is that the temperature resistance generally does not exceed 150°C. With the development of deep wells and ultra-deep wells, the downhole high-temperature en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F226/10C08F220/56C08F220/58C09K8/035C09K8/24
CPCC08F290/061C09K8/035C09K8/24C09K2208/12C08F226/10C08F220/56C08F220/585
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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