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Environment-friendly drilling fluid strong in plugging property

A plugging, environmentally friendly technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as toxic raw materials and groundwater pollution, achieve good shale hydration, achieve direct discharge, and prevent jamming. drill 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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  • Environment-friendly drilling fluid strong in plugging property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The invention provides an environment-friendly drilling fluid with strong plugging properties, which includes 2% bentonite, 0.3% sodium carbonate, 0.3% polyamine, 0.2% low-viscosity polyanionic cellulose, and 0.3% xanthan gum , 2% pregelatinized tapioca starch, 2% plugging agent, 1% 600 mesh calcium carbonate, 0.5% castor oil modified lubricant, 25% barite, and the contents of each component are mass contents, Measured by mass of water.

[0026] The preparation method of the plugging agent is as follows:

[0027] 1) Dissolve glucose into deionized water to make a glucose solution, then transfer the glucose solution to the liner as

[0028] In a tetrafluoroethylene hydrothermal synthesis kettle, react at 160°C for 6h, cool to room temperature after the reaction, centrifugally filter, wash three times with deionized water, and dry to obtain carbon spheres.

[0029] 2) Add sodium metaaluminate solution in a four-neck flask equipped with a mechanical stirrer, then add dil...

Embodiment 2

[0032] The invention provides an environment-friendly drilling fluid with strong plugging properties, which includes 6% bentonite, 0.5% sodium carbonate, 0.5% polyamino ether, 0.2% low-viscosity carboxymethyl cellulose, 0.3% hydroxyethyl Base cellulose, 0.1% xanthan gum, 8% pregelatinized tapioca starch, 5% plugging agent, 4% 1250 mesh calcium carbonate, 4% castor oil modified lubricant, 200% barite , the content of each component is the mass content, based on the mass of water.

[0033] The preparation method of described blocking agent is as follows:

[0034] 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.

[0035]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 a...

Embodiment 3

[0038] 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% hydroxyethyl cellulose, 0.2% xanthan gum, 4% Pregelatinized tapioca starch, 3% plugging agent, 3% 1500 mesh calcium carbonate, 2% castor oil modified lubricant, 250% barite, the contents of each component are mass content, expressed as water quality meter.

[0039] The preparation method of described blocking agent is as follows:

[0040] 1) Same as Example 1, only the hydrothermal reaction conditions were different, and the reaction was carried out at 170° C. for 5 hours.

[0041] 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 ...

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Abstract

The invention discloses environment-friendly drilling fluid strong in the plugging property. The environment-friendly drilling fluid strong in the plugging property is prepared from 2-6% of bentonite, 0.3-0.5% of sodium carbonate, 0.3-0.5% of inhibitor, 0.2-0.5% of viscosity-shearing agent, 0.1-0.3% of xanthan gum, 2-8% of fluid loss agent, 2-5% of plugging agent, 1-4% of calcium carbonate, 0.5-4% of lubricant and 25-250% of inert weighting agent, wherein the nano plugging agent is obtained by mixing a product, which is obtained from a reaction of carbon balls coated with AlOOH, acrylamide, N-isopropylacrylamide and hexamethylenetetramine, with vinyl acetate-ethylene copolymer emulsion. The environment-friendly drilling fluid has the advantages of strong plugging property, strong lubricating performance, good rheological property, strong debris carrying ability and environmental protection, and is especially suitable for environmentally sensitivity areas.

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): C09K8/03C09K8/035C09K8/24C09K8/42C09K8/44
CPCC09K8/03C09K8/032C09K8/035C09K8/24C09K8/426C09K8/44C09K2208/12C09K2208/18
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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