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Nanometer polymer blocking agent for drilling fluid and preparation method thereof

A technology of nano-polymer and plugging agent, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as high cost, unfavorable environmental protection, etc., achieve high conversion rate, good filtration performance, reduce The effect of filtration

Active Publication Date: 2019-10-29
黑龙江益瑞化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oil-based drilling fluid has the characteristics of strong inhibition and plugging, and is an effective means to solve such problems, but its cost is high and it is not conducive to environmental protection. base drilling fluid

Method used

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  • Nanometer polymer blocking agent for drilling fluid and preparation method thereof
  • Nanometer polymer blocking agent for drilling fluid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Embodiment 1 of the present invention provides a nano-polymer plugging agent for drilling fluid. In parts by weight, the preparation raw materials include 7.8 parts of acrylic acid, 11.5 parts of acrylamide, and 9.72 parts of polyethylene glycol methyl ether methacrylate ( Mn300), 4.1 parts of N-vinyl-N-(2-phenylethyl)-acetamide, 0.08 parts of potassium persulfate, 10 parts of ethylene oxide propylene oxide block copolyether, 4 parts of Tween 40, 1 part of Span 60, 3.5 parts of N,N-methylenebisacrylamide, 55 parts of water, 43 parts of white oil.

[0094] The preparation method of ethylene oxide propylene oxide block copolyether is as follows:

[0095] (1) Under normal pressure, the temperature in the reactor is controlled at 10°C, feed nitrogen to replace the air in the reactor, and add 4 parts by weight of polyethylene glycol (Mn400).

[0096] (2) Add 1 weight part of potassium hydroxide to the reactor in step 1, and stir evenly.

[0097] (3) The temperature of the ...

Embodiment 2

[0104] Embodiment 2 of the present invention provides a nano-polymer plugging agent for drilling fluid. In parts by weight, the preparation raw materials include 7.8 parts of acrylic acid, 11.5 parts of acrylamide, and 10.8 parts of polyethylene glycol methyl ether methacrylate ( Mn500), 4.1 parts of N-vinyl-N-(2-phenylethyl)-acetamide, 0.08 parts of potassium persulfate, 10 parts of ethylene oxide propylene oxide block copolyether, 4 parts of Tween 40, 1 part of Span 60, 3.5 parts of N,N-methylenebisacrylamide, 55 parts of water, 43 parts of white oil.

[0105] The preparation method of ethylene oxide propylene oxide block copolyether is as follows:

[0106] (1) Under normal pressure, the temperature in the reactor is controlled at 10°C, feed nitrogen to replace the air in the reactor, and add 4 parts by weight of polyethylene glycol (Mn400).

[0107] (2) Add 1 weight part of potassium hydroxide to the reactor in step 1, and stir evenly.

[0108] (3) The temperature of the ...

Embodiment 3

[0115] Embodiment 3 of the present invention provides a nano-polymer plugging agent for drilling fluid. In parts by weight, the preparation raw materials include 7.05 parts of acrylic acid, 10.43 parts of acrylamide, and 8.82 parts of polyethylene glycol methyl ether methacrylate ( Mn300), 3.7 parts of N-vinyl-N-(2-phenylethyl)-acetamide, 0.05 parts of potassium persulfate, 7 parts of ethylene oxide propylene oxide block copolyether, 5.6 parts of Tween 40, 1.4 parts of Span 60, 2 parts of N,N-methylenebisacrylamide, 50 parts of water, 40 parts of white oil.

[0116] The preparation method of ethylene oxide propylene oxide block copolyether is as follows:

[0117] (1) Under normal pressure, the temperature in the reactor is controlled at 10°C, feed nitrogen to replace the air in the reactor, and add 4 parts by weight of polyethylene glycol (Mn400).

[0118] (2) Add 1 weight part of potassium hydroxide to the reactor in step 1, and stir evenly.

[0119] (3) The temperature of ...

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Abstract

The invention provides a nanometer polymer blocking agent for a drilling fluid and a preparation method thereof, belonging to the technical field of oil-gas exploration and development. The nanometerpolymer blocking agent for the drilling fluid comprises, by weight, 14-16 parts of a surfactant, 30-35 parts of a functional monomer, 40-46 parts of an oil-phase dispersion medium, 2-5 parts of a cross-linking agent, 0.05-0.1 part of an initiator and 50-60 parts of water. The functional monomer includes an acrylic monomer, an acrylamide monomer and a polyethylene glycol methyl ether acrylate monomer. Since the nanometer polymer of the invention is a high-molecular-weight polymer and has non-polar functional groups on the molecular chain, a hydrophobic film can be formed on a mud cake, so polarmolecules such as water cannot pass through the film composed of non-polar molecules; and at the same time, the nanometer polymer can be gathered in the mud cake to reduce the permeability of the mudcake, thereby achieving the purpose of reducing the fluid loss of the drilling fluid. At the same time, the nanometer polymer blocking agent also has certain lubrication and anti-collapse performance, does not damage a hydrocarbon reservoir, and is of important significance for oil-gas field development in the future.

Description

technical field [0001] The invention relates to a nanometer polymer plugging agent for drilling fluid and a preparation method thereof, belonging to the technical field of oil and gas exploration and development. Background technique [0002] With the expansion of the scope of exploration and development of oil and gas resources, especially the development of unconventional oil and gas resources shale gas and tight oil, the wellbore instability of hard and brittle shale has become an urgent problem to be solved. Studies by foreign scholars have shown that the shale shale pore throat size is between 5-50nm, and the average pore-throat diameter is 10-30nm, and the hard and brittle shale that is easy to cause wellbore instability usually has closed or open bedding and Micro cracks, strong capillary force. Under the action of positive pressure difference and capillary pressure, the drilling fluid is easy to invade, causing the shale to crack along the fracture plane or bedding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F226/02C08F220/28C08F222/38C09K8/512C09K8/508C09K8/88
CPCC08F283/06C09K8/5083C09K8/512C09K8/887C09K2208/10C08F220/56
Inventor 李明星战薇伊
Owner 黑龙江益瑞化工有限公司
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