Modified nano-silica plugging agent, water-based drilling fluid, and preparation methods and applications of modified nano-silica plugging agent and water-based drilling fluid

A technology of nano-silica and water-based drilling fluid, which is applied in the field of drilling fluid and can solve the problems of small particle size, large specific surface energy and easy agglomeration of nano-blocking materials

Inactive Publication Date: 2020-04-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a modified nano-silica plugging agent, water-based drilling fluid and its Preparation method and application, the core-shell structure modified nano-silica plugging agent can enter the micropores of marl for plugging, and has good pressure bearing capacity

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  • Modified nano-silica plugging agent, water-based drilling fluid, and preparation methods and applications of modified nano-silica plugging agent and water-based drilling fluid

Examples

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preparation example Construction

[0024] The first aspect of the present invention provides a kind of preparation method of modified nano silica plugging agent, and this method comprises:

[0025] (1) contacting nano-silica with a mixed solution containing acrylic acid and polybutylmethacrylate and carrying out ultrasonic dispersion treatment to obtain an oil phase solution;

[0026] (2) Contacting water, polyethylene glycol octylphenyl ether and sodium bicarbonate and performing the first emulsification treatment to obtain the first emulsification solution;

[0027] (3) contacting the oil phase solution with the first emulsified solution and performing a second emulsified treatment to obtain a second emulsified solution;

[0028] (4) Under the protection of nitrogen, the second emulsified solution is contacted with a water-soluble initiator, and the product obtained after the contact is centrifuged and dried to obtain a plugging agent.

[0029] According to the present invention, in step (1), the weight rati...

Embodiment 1

[0077] This example is to illustrate the plugging agent and water-based drilling fluid prepared by the method of the present invention.

[0078] (1) Under the condition that the stirring rate is 100r / min, the particle diameter of 5 parts by weight is that the nano silicon dioxide of 20nm is added in the mixed solution of the acrylic acid of 13 parts by weight, the polybutylmethacrylate of 3 parts by weight , and in a ultrasonic emulsification disperser, disperse for 1h under the condition of an ultrasonic frequency of 20kHz to obtain an oil phase solution;

[0079] (2) In 50 parts by weight of deionized water, add 0.5 parts by weight of polyethylene glycol octyl phenyl ether and sodium bicarbonate of 0.3 parts by weight successively, and pre-emulsify for 6 minutes under the condition that the stirring speed is 100r / min, and obtain The weakly alkaline first emulsified solution with a pH value of 8;

[0080] (3) Add the oil phase solution to the first emulsified solution, and e...

Embodiment 2

[0086] This example is to illustrate the plugging agent and water-based drilling fluid prepared by the method of the present invention.

[0087] (1) Under the condition that the stirring rate is 100r / min, the particle diameter of 2 parts by weight is the nano silicon dioxide of 20nm is added in the mixed solution of the acrylic acid of 5 parts by weight, the polybutylmethacrylate of 0.2 parts by weight , and in a ultrasonic emulsification disperser, disperse for 0.8h under the condition of an ultrasonic frequency of 20kHz to obtain an oil phase solution;

[0088] (2) In 50 parts by weight of deionized water, add 0.1 parts by weight of polyethylene glycol octyl phenyl ether and sodium bicarbonate of 0.1 parts by weight successively, and pre-emulsify for 2 minutes under the condition that the stirring speed is 100r / min, and obtain The weakly alkaline first emulsified solution with a pH value of 7;

[0089] (3) Add the oil phase solution to the first emulsified solution, and emu...

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Abstract

The invention relates to the field of drilling fluids, and discloses a modified nano-silica plugging agent, a water-based drilling fluid, and preparation methods and applications of the modified nano-silica plugging agent and the water-based drilling fluid. The preparation method of the plugging agent comprises the steps: (1) making nano-silica contact with a mixed solution containing acrylic acidand polybutyl methacrylate, and carrying out ultrasonic dispersion to obtain an oil phase solution; (2) contacting water, polyethylene glycol octylphenyl ether and sodium bicarbonate, and carrying out emulsification treatment to obtain a first emulsified solution; (3) carrying out secondary emulsification treatment on the oil phase solution and the first emulsified solution to obtain a second emulsified solution; and (4) under the protection of nitrogen, contacting the second emulsified solution with a water-soluble initiator, and carrying out centrifugal separation on the product obtained after contacting and drying to obtain the plugging agent. The plugging agent can enter stratum pores of a mudstone and limestone interlayer for plugging, has good pressure bearing capacity, can preventpressure transmission from expanding the pores, and can meet the oil and gas exploitation work of mud shale.

Description

technical field [0001] The invention relates to the field of drilling fluids, in particular to a modified nano-silica plugging agent, a water-based drilling fluid, a preparation method and an application thereof. Background technique [0002] Borehole wall instability is a major engineering problem that has plagued the field of drilling fluids for many years and needs to be solved urgently. The instability of the borehole wall will cause complex situations such as well collapse, drill sticking and lost circulation, which will seriously affect the quality and progress of drilling. The wellbore instability of the formation mainly occurs in the hard and brittle shale formation with fractures, and most of the formations have closed or open bedding and micro-fractures, and the capillary force is strong. 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 surface or bedding su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/16
CPCC09K8/03C09K8/16C09K2208/10C04B28/24C09K8/206C09K8/426C04B24/2641C04B24/32C04B40/0021C04B40/0028C09K8/145C09K8/203C09K8/24C09K8/44
Inventor 白杨程焱罗平亚李成张昊李国军
Owner SOUTHWEST PETROLEUM UNIV
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