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Degradable drilling fluid based on nano material

A technology of nanomaterials and drilling fluids, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of unstudied nanoscale pore plugging and unblocking effects of nano-dispersed drilling fluids, and achieve Filter loss performance improvement, damage reduction, damage reduction effects

Active Publication Date: 2013-11-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention is only limited to the development of a nano-drilling fluid formula, while the present invention is based on nano-materials and is aimed at low-porosity and low-permeability coal rock. The additives in the drilling fluid formula are different, and the nano-materials used are Nano-emulsion, not nano-calcium carbonate, and this invention does not study the effect of nano-dispersed drilling fluid on coal and rock nano-scale pore plugging and plugging removal

Method used

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  • Degradable drilling fluid based on nano material
  • Degradable drilling fluid based on nano material
  • Degradable drilling fluid based on nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This example mainly reflects: (1) Basic performance parameters (density, apparent viscosity, fluid loss, pH and filter cake thickness) of the degradable drilling fluid based on nanomaterials; (2) Degradable drilling fluid based on nanomaterials Under the action of the breaker, the apparent viscosity changes with time, the filter cake removal test results and the coal gas permeability test results.

[0025] 1. Experimental formula

[0026] The formula of the degradable drilling fluid based on nanomaterials in this example is: 3g bentonite per 100ml of water, 0.25g thickener CMC, 1.5g fluid loss reducer, 5g potassium salt, 5g Henan Keli nano calcium carbonate, composite dispersant 0.5g. The composite dispersant contains 0.1g sodium lauryl sulfate, 0.2g OP-10 emulsifier, and 0.2g cetyltrimethylammonium bromide. A little ammonium chloride (adjust the pH to 7), 0.1g of biological enzyme breaker.

[0027] Preparation method: (1) Add proper amount of water to container 1, and then...

Embodiment 2

[0058] This example mainly reflects: (1) The basic performance parameters (density, apparent viscosity, fluid loss, pH and filter cake thickness) of the biodegradable drilling fluid based on nanomaterials; (2) The biodegradable drilling fluid based on nanomaterials Under the action of the breaker, the apparent viscosity changes with time.

[0059] 1. Experimental formula

[0060] The formula of the degradable drilling fluid based on nano-materials in this example is: 3g bentonite per 100ml of water, 0.5g thickener CMC, 1.5g fluid loss agent, 2.5g potassium salt, 5g nanometer calcium carbonate produced by Henan Keli, composite Dispersant 0.5g. The composite dispersant contains 0.1g sodium lauryl sulfate, 0.2g OP-10 emulsifier, and 0.2g cetyltrimethylammonium bromide. A little ammonium chloride (adjust the pH to 7), and 1g biological enzyme breaker. The preparation method is the same as in Example 1.

[0061] 2. Basic properties of biodegradable drilling fluid based on nanomaterial...

Embodiment 3

[0070] This example mainly reflects: (1) Basic performance parameters (density, apparent viscosity, fluid loss, pH and filter cake thickness) of the degradable drilling fluid based on nanomaterials; (2) Degradable drilling fluid based on nanomaterials Under the action of the breaker, the apparent viscosity changes with time.

[0071] 1. Experimental formula

[0072] The formulation of the degradable drilling fluid based on nano-materials in this example is: 3g bentonite per 100ml of water, 0.5g thickener CMC, 1.0g fluid loss agent, 2.5g potassium salt, 2.5g nanometer calcium carbonate produced by Henan Keli, Compound dispersant 0.5g. The composite dispersant contains 0.1g sodium lauryl sulfate, 0.2g OP-10 emulsifier, and 0.2g cetyltrimethylammonium bromide. A little ammonium chloride (adjust the pH to 7), and 0.5g of biological enzyme breaker. The preparation method is the same as in Example 1.

[0073] 2. Basic properties of biodegradable drilling fluid based on nanomaterials

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Abstract

The invention provides a degradable drilling fluid based on a nano material. The degradable drilling fluid consists of a drilling fluid unit and a blocking-preventing liquid unit and is characterized by comprising the following ingredients in parts by mass according to the addition amount in every 100 parts of water: 2-3 parts of bentonite, 0.25-0.5 part of a thickening agent, 1-2 parts of a filtrate reducer, 2.5-5 parts of sylvite, 2.5-5 parts of nano calcium carbonate, 0.5 part of a composite dispersing agent, and a pH value adjusting agent, wherein the pH value of the drilling fluid is adjusted to be neutral through the pH value adjusting agent, and the blocking-preventing liquid unit comprises biological enzyme and hydrochloric acid. By utilizing the degradable drilling fluid, nanoscale pores of coal can be temporarily blocked in the drilling process of low-porosity and low-permeability coal bed gas, the damage of the drilling fluid to a coal reservoir is reduced, and moreover the permeability recovery value of the coal is as high as 80-95% after biological enzyme degradation hydrochloric acid acidizing treatment.

Description

Technical field [0001] The invention provides a degradable drilling fluid based on nano-materials suitable for low-porosity and low-permeability coalbed methane drilling, and belongs to the fields of coalbed methane drilling and coal mine gas drainage. Background technique [0002] my country's coalbed methane resources are very rich, and the total resources of coalbed methane shallower than 2000m are about 36.81×10 8 m 3 , The total recoverable resources of coalbed methane is about 10×10 8 m 3 . The main characteristics of coalbed methane reservoirs in my country are low gas saturation, low porosity, low permeability and low reservoir pressure; the pore structure of coal rocks is generally dominated by micropores, followed by transitional pores, and mesopores and macropores. The ratio is relatively small. We found through experiments that the pore throat diameters of Jincheng 3# coal rock pores are mainly distributed in 0~100nm (such as figure 1 Shown). The characteristics of l...

Claims

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Application Information

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IPC IPC(8): C09K8/16C09K8/528B82Y30/00
Inventor 蔡记华王济君袁野谷穗
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)