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Environmentally-friendly drilling fluid with high plugging performance

A plugging, drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as groundwater pollution, toxic raw materials, etc., and achieve good shale hydration, good thermal stability, filtering Low loss effect

Inactive Publication Date: 2017-12-22
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the raw materials of these treatment agents are toxic, and because of the limitations of the production process, the treatment agents as end products still contain some toxic substances, such as residual acrylamide, acrylonitrile, acrylic acid and other monomers in the polymer treatment agent, asphalt The treatment agent contains more polycyclic aromatic hydrocarbons, and the remaining phenols and aldehydes in the phenolic resin treatment agent have strong biological toxicity. These substances will undoubtedly pollute the surrounding environment of the well site and groundwater.

Method used

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  • Environmentally-friendly drilling fluid with high plugging performance
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The invention provides a kind of environment-friendly drilling fluid with strong plugging property, which comprises 2% bentonite, 0.3% sodium carbonate, 0.3% polyamine, 0.2% coating agent, 0.3% xanthan gum, 2% pregelatinized tapioca starch, 2% plugging agent, 1% 600-mesh calcium carbonate, 0.5% castor oil modified lubricant, and 25% barite. quality meter.

[0029] The preparation method of the plugging agent is as follows:

[0030] 1) Dissolve glucose in deionized water to make a glucose solution, then transfer the glucose solution to a tetrafluoroethylene-lined hydrothermal synthesis kettle, react at 160°C for 6 hours, cool to room temperature after the reaction, and centrifugally filter , washed three times with deionized water, and dried to obtain carbon spheres.

[0031] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimeth...

Embodiment 2

[0039] The invention provides a kind of environment-friendly drilling fluid with strong plugging property, including 6% bentonite, 0.5% sodium carbonate, 0.5% polyamino ether, 0.2% coating agent, 0.3% hydroxyethyl cellulose, 0.1% xanthan gum, 8% pregelatinized tapioca starch, 5% plugging agent, 4% 1250 mesh calcium carbonate, 4% castor oil modified lubricant, 200% barite, each component The contents are all mass contents, based on the mass of water.

[0040] The preparation method of described blocking agent is as follows:

[0041] 1) Same as Example 1, except that the hydrothermal reaction conditions are different, and the reaction is carried out at 180° C. for 4 hours.

[0042] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to 4, then add urea and cetyltrimethylammonium bromide to the solution, stir , until the solution is clear, then add the carbon spheres prepare...

Embodiment 3

[0050] The present invention is an environment-friendly drilling fluid with strong plugging properties, including 4% bentonite, 0.4% sodium carbonate, 0.4% polyamine, 0.2% coating agent, 0.2% xanthan gum, 4% pre- Gelatinized tapioca starch, 3% plugging agent, 3% 1500 mesh calcium carbonate, 2% castor oil modified lubricant, 250% barite, the contents of each component are the mass content, calculated by the mass of water

[0051] The preparation method of described blocking agent is as follows:

[0052] 1) Same as Example 1, only the hydrothermal reaction conditions were different, and the reaction was carried out at 170° C. for 5 hours.

[0053] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dilute sulfuric acid to adjust the pH of the solution to be 4, then add urea and cetyltrimethylammonium bromide to the solution, Stir until the solution is clear, then add the carbon spheres prepared in step 1 into a four-neck flask ...

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Abstract

The invention discloses an environmentally-friendly drilling fluid with high plugging performance. The drilling fluid comprises 2-6% of bentonite, 0.3-0.5% of sodium carbonate, 0.3-0.5% of an inhibitor, 0.2-0.5% of a coating agent, 0.1-0.3% of xanthan gum, 2-8% of a filtrate reducer, 2-5% of a plugging agent, 1-4% of calcium carbonate, 0.5-4% of a lubricant, and 25-250% of an inert weighting agent; and the nano plugging agent is formed by compounding of a product prepared from carbon spheres coated with AlOOH, acrylamide, N-isopropylacrylamide and hexamethylenetetramine and a vinyl acetate-ethylene copolymerization emulsion. The environmentally-friendly drilling fluid has the characteristics of high plugging performance, high lubricating performance, a good rheological property, strong ability of carrying rock debris, and friendliness to environments, and the environmentally-friendly drilling fluid is specially applied to environmental sensitive areas regions.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to an environment-friendly drilling fluid with strong plugging properties. Background technique [0002] In recent years, governments around the world and local governments of various countries have formulated strict laws and regulations on the waste discharge of drilling construction. For example: the U.S. Environmental Protection Agency stipulates that the mysis test solution LC 50 When the (50% lethal dose) value must be greater than 30000 mg / L, the waste drilling fluid is allowed to be discharged into the sea. UK, Netherlands, Norway require simultaneous testing of drilling waste LC 50 value and biodegradability to determine the long-term effects of drilling waste on the marine environment. In 2008, the State Oceanic Administration of China issued the national standard "China Offshore Oil Exploration and Development Pollutant Emission Concentration Limits", which clea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C08F292/00C08F220/56C08F220/54C08F220/58C08F220/06C08F212/14
CPCC09K8/24C08F292/00C09K2208/34C09K2208/12C08F220/585C08F212/14
Inventor 李广环黄达全王伟忠龙涛张健苏君马红曹孜英王运动舒儒宏郭剑梅
Owner CNPC BOHAI DRILLING ENG
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