Polymer nanometer blocking agent for water-based drilling fluid and its preparation method

A nano-plugging agent, water-based drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor plugging effect of the plugging agent, and solve the problems of well wall collapse and plugging. The effect of enhancing and stabilizing the well wall

Inactive Publication Date: 2018-04-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of polymer nano plugging agent for water-based drilling fluid, to solve the problem that existing existing plugging agent plugging effect is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The polymer nano-sealing agent for water-based drilling fluid in this embodiment is mainly prepared from the following raw materials:

[0028] 5.6 parts of polyoxyethylene laurate, 2.4 parts of N-isopropylacrylamide, 16.3 parts of acrylic acid, 1.2 parts of methyl methacrylate and 0.1 part of dibenzoyl peroxide.

[0029] The organic solvent used in this embodiment is xylene.

[0030] The preparation method of the polymer nano-sealing agent for water-based drilling fluid of the present embodiment is:

[0031] Dissolve 5.6 parts of polyoxyethylene laurate in xylene, then add 2.4 parts of N-isopropylacrylamide, 16.3 parts of acrylic acid, and 1.2 parts of methyl methacrylate into the above solution. Raise to 45°C for pre-emulsification reaction for 1 hour, then dissolve 0.1 part of dibenzoyl peroxide in xylene, add drop by drop to the above pre-emulsification solution, after the addition is completed, heat up to 75°C for reaction 5 hours, the polymer nano-sealing agent f...

Embodiment 2

[0033] The polymer nano-sealing agent for water-based drilling fluid in this embodiment is mainly prepared from the following raw materials:

[0034] 4.8 parts of propylene glycol monostearate, 3.7 parts of N,N-dimethylacrylamide, 21.2 parts of acrylamide, 0.9 part of styrene and 0.21 part of azobisisobutyronitrile.

[0035] The organic solvent used in this embodiment is paraffin oil.

[0036] The preparation method of the polymer nano-sealing agent for water-based drilling fluid of the present embodiment is:

[0037] Dissolve 4.8 parts of propylene glycol monostearate in paraffin oil, then add 3.7 parts of N,N-dimethylacrylamide, 21.2 parts of acrylamide, and 0.9 parts of styrene into the above solution. Raise to 50°C for pre-emulsification reaction for 2 hours, then dissolve 0.21 parts of azobisisobutyronitrile in paraffin oil, add dropwise to the above-mentioned pre-emulsification solution, after the addition is completed, raise the temperature to 80°C for 8 hours, That i...

Embodiment 3

[0039] The polymer nano-sealing agent for water-based drilling fluid in this embodiment is mainly prepared from the following raw materials:

[0040] 5.9 parts of Span-65 were dissolved in cyclohexane, 4.1 parts of N-isopropylacrylamide, 17.3 parts of sodium p-styrenesulfonate, 1.4 parts of butyl acrylate and 0.35 parts of dibenzoyl peroxide.

[0041] The organic solvent used in this embodiment is cyclohexane.

[0042] The preparation method of the polymer nano-sealing agent for water-based drilling fluid of the present embodiment is:

[0043] Dissolve 5.9 parts of Span-65 in cyclohexane, then add 4.1 parts of N-isopropylacrylamide, 17.3 parts of sodium p-styrene sulfonate, and 1.4 parts of butyl acrylate into the above solution, and under constant stirring, the Raise the temperature to 48°C for a pre-emulsification reaction for 1.5 hours, then dissolve 0.35 parts of dibenzoyl peroxide in cyclohexane and add it dropwise to the above-mentioned pre-emulsification solution. Afte...

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Abstract

The invention discloses a polymer nanometer blocking agent for water-based drilling fluid and its preparation method, and belongs to the technical field of a drilling fluid function material. The polymer nanometer blocking agent for water-based drilling fluid is prepared from, by weight, 4-16 parts of emulgator, 2-14 parts of temperature sensitive monomer, 10-53 parts of hydrophilic monomer, 0.5-10 parts of hydrophobic monomer and 0.05-0.5 part of initiator. The polymer nanometer blocking agent is small in size, and can block micro and nano-sized holes of a shale well wall; through compressivedeformation property of the poymer, the compact blocking of the well wall hole can be realized; by means of the temperature response property of an intelligent polymer, the transformation from hydrophilia to hydrophobicity is realized in the well wall, and the zone closing to the well wall is transformed to be a hydrophobic environment, thus the diffusion and permeation of water in the water-based dirlling fluid towards the shale well wall is effectively stopped, thereby stabilizing the well wall and protecting reservoir, and providing an important technical guarantee for the development of the water-based drilling fluid system for shale development.

Description

technical field [0001] The invention relates to the technical field of drilling fluid functional materials, in particular to a polymer nano-sealing agent for water-based drilling fluid and a preparation method thereof. Background technique [0002] my country is rich in shale gas resources and is an important unconventional energy source. The development of shale gas is of great significance to alleviate the shortage of oil and gas resources in my country. During the drilling of shale gas wells, it is necessary to drill horizontal wells in the shale formation. Currently, oil-based drilling fluids are mainly used for drilling. Oil-based drilling fluids are costly, seriously polluted, and the follow-up treatment procedures are cumbersome and expensive. Therefore, it is urgent to develop a water-based drilling fluid system suitable for shale gas drilling. [0003] During the drilling process, the filtrate in the water-based drilling fluid can easily penetrate the well wall a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/54C08F220/14C08F220/56C08F212/08C08F212/14C08F220/18C08F283/06C08F220/58C09K8/44
CPCC09K8/44C08F212/14C08F220/06C08F220/56C08F283/065C08F220/54C08F212/08C08F220/585C08F220/1804
Inventor 武元鹏林元华苟绍华王志豪薛诗山郭美玲张芮夏元梦王永生
Owner SOUTHWEST PETROLEUM UNIV
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