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Environment-friendly cutting agent for water-based drilling fluid and preparation method of environment-friendly cutting agent

A water-based drilling fluid and environment-friendly technology, applied in the field of drilling fluid, can solve problems such as difficulty in handling, and achieve the effect of reducing BOD5 value, facilitating post-processing, and achieving remarkable effect.

Inactive Publication Date: 2019-07-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of oil-based drilling fluid shear lifting agent, it brings difficulties to subsequent treatment

Method used

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  • Environment-friendly cutting agent for water-based drilling fluid and preparation method of environment-friendly cutting agent
  • Environment-friendly cutting agent for water-based drilling fluid and preparation method of environment-friendly cutting agent
  • Environment-friendly cutting agent for water-based drilling fluid and preparation method of environment-friendly cutting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of environment-friendly water base drilling fluid is used to lift the shearing agent, comprises water, AlCl 3 , MgCl 2 And modifying agent, percentage by weight is: the water of 50%-59%, the AlCl of 30%-36% 3 , 10%-12% MgCl 2 And 1%-2% modifier.

[0040] The invention belongs to a water-based environment-friendly drilling fluid treatment agent of inorganic materials. When the invention is used in the drilling site, it is easy to degrade and non-toxic, and the electrical conductivity and heavy metal ions meet the relevant sewage comprehensive discharge standards. The environment-friendly cutting agent for water-based drilling fluid of the present invention can resist high temperature, the highest resistance is 150°C, and the indoor core damage evaluation of the formulated glue has an average damage rate of 6.295%, which belongs to the low damage range. The invention makes the COD value and BOD of the cutting agent 5 The value is significantly reduced, and the...

Embodiment 2

[0042] A kind of environment-friendly water base drilling fluid is used to lift the shearing agent, comprises water, AlCl 3 , MgCl 2 and modifier, the weight percentage is: 55% of water, 33% of AlCl 3 , 11% MgCl 2 and 1% modifier.

[0043] The technical scheme of the present invention is a cutting agent for water-based drilling fluid, and the COD value and BOD of the cutting agent 5 The value is low, and the toxicity is small, which is beneficial to the post-processing.

Embodiment 3

[0045] An environment-friendly cutting agent for water-based drilling fluid, the difference from Example 1 is that the modifier is sodium dodecyl sulfate, sodium dodecylbenzenesulfonate or dodecyl monosodium potassium phosphate.

[0046]In actual use, the modifier is sodium dodecyl sulfate, sodium dodecylbenzenesulfonate or potassium dodecyl monophosphate. The modifier mainly plays the role of emulsification, and three different modifiers can be used as emulsifiers, and any one can be selected.

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Abstract

The invention belongs to the technical field of drilling fluid and particularly relates to environment-friendly cutting agent for water-based drilling fluid and a preparation method of the environment-friendly cutting agent. The method includes five steps of preparation of a mixed emulsion, regulating and recording the pH value of the mixed emulsion, aging of the mixed emulsion, vacuum-pumping filtration and constant-temperature standing; the environment-friendly cutting agent prepared comprises, by weight, 50%-59% of water, 30%-36% of AlCl3, 10%-12% of MgCl2 and 1%-2% of a modifier. With themethod, the increase rate of apparent viscosity reaches 300.00% and the increase rate of dynamic cutting force reaches 350.00%; the COD (chemical oxygen demand) value and BOD5 (biochemical oxygen demand) value are obviously reduced, the toxicity is small, and post-treatment is benefited; the environment-friendly cutting agent can replace a currently used polymer drilling fluid system, and is suitable for a conventional oil / gas well directional well.

Description

technical field [0001] The invention belongs to the technical field of drilling fluids, and in particular relates to an environment-friendly cutting agent for water-based drilling fluids and a preparation method thereof. Background technique [0002] With the rapid development of my country's petroleum industry, the use of drilling fluid poses higher challenges in drilling technology, especially the environmental protection of drilling fluid, which is regulated and restricted by national environmental protection laws and policies. Therefore, based on the current development of environmental protection drilling fluid technology, exploring new environmental protection drilling fluid technology plays a decisive role in the development of drilling technology. [0003] Drilling fluid is known as the "blood" of drilling. When the mission of the drilling project is completed, the treatment of the non-recyclable part is to solve the difficulty of environmental protection of drilling...

Claims

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Application Information

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IPC IPC(8): C09K8/22
CPCC09K8/16C09K8/22
Inventor 段志锋欧阳勇陆红军来轩昂吴学升高云文黄占盈赵巍蒙华军陈春宇
Owner PETROCHINA CO LTD
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