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Modified starch fluid loss additive for drilling fluids and preparation method thereof

A fluid loss control agent, drilling fluid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of toxic and harmful, comprehensive quality can not effectively meet the requirements of safe drilling, environmental protection, unstable quality, etc. Simple conditions, good promotion and application value, and the effect of reducing production costs

Inactive Publication Date: 2015-09-02
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the drilling of conventional wells and exploratory wells in Changqing Oilfield, Ordos Basin, there are many kinds of fluid loss control agents for drilling fluids currently used, such as sulfonated asphalt, phenolic resin, humic acid, etc. Due to the selection of raw materials, production and processing technology Due to various reasons, the final products contain toxic and harmful substances to the environment and human health to varying degrees, and the quality is unstable. In addition to the pursuit of high profits in the market, the comprehensive quality of some of the products cannot effectively meet the needs of safe drilling and reservoir protection. , the need to protect the environment

Method used

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  • Modified starch fluid loss additive for drilling fluids and preparation method thereof
  • Modified starch fluid loss additive for drilling fluids and preparation method thereof
  • Modified starch fluid loss additive for drilling fluids and preparation method thereof

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Embodiment 1

[0019] In order to meet the requirements of drilling fluid fluid loss control agents for safe drilling, protection of production layers, and environmental protection in the process of large-scale oilfield development, this embodiment provides a modified starch fluid loss control agent for drilling fluids, which is composed of the following weight percentages: Composition: 60%-80% natural starch, 3%-4% bromoacetic acid, 5%-15% industrial alcohol, 2%-7% sodium hydroxide, 0.1%-0.5% diethylene Triamine, 0.5% to 1.0% glacial acetic acid, the rest is water.

[0020] In addition, the preparation method of the modified starch fluid loss reducer for drilling fluid of the invention comprises the following steps:

[0021] 1) First add 60% to 80% by weight of natural starch into a closed reaction kettle, and start stirring after feeding pure nitrogen for 10 minutes.

[0022] 2) When the temperature of the reaction kettle reaches 50° C. to 80° C., stir and evenly add 3% to 4% bromoacetic ...

Embodiment 2

[0027] This embodiment provides a modified starch fluid loss reducer for drilling fluid, which is composed of the following components in weight percentage: 80% native starch, 4% bromoacetic acid, 8% industrial alcohol, 3% hydrogenated Sodium, 0.5% diethylenetriamine, 0.5% glacial acetic acid, 4% water; the weight of the bromoacetic acid is 5.0% of the weight of the natural starch.

[0028] The preparation method of the modified starch fluid loss reducer for drilling fluid of the invention comprises the following steps:

[0029] 1) First add 80% by weight of natural starch into a closed reaction kettle, and start stirring after feeding pure nitrogen for 10 minutes.

[0030] 2) When the temperature of the reaction kettle reaches 50° C. to 80° C., stir and evenly add 4% bromoacetic acid and 8% industrial alcohol in sequence to form starch milk.

[0031] 3) Add 3% sodium hydroxide and 0.5% diethylenetriamine successively to the starch milk formed in step 2), stir and react for 6...

Embodiment 3

[0058] This embodiment provides a modified starch fluid loss reducer for drilling fluid, which is composed of the following components in weight percentage: 60% native starch, 3% bromoacetic acid, 15% industrial alcohol, 2% hydrogenated Sodium, 0.1% diethylenetriamine, 0.8% glacial acetic acid, 19.1% water. First add 60% natural starch by weight into the closed reaction kettle, and start stirring after 10 minutes of feeding pure nitrogen; when the temperature of the reaction kettle reaches 50°C to 80°C, stir and slowly and evenly add 3% bromoacetic acid, 15% industrial alcohol forms starch milk; then add 2% sodium hydroxide to alkalize, then add 0.1% diethylenetriamine (completely added in 30 minutes), stir and react for 60 minutes, stop heating; finally, add 0.8% glacial acetic acid and 19.1% water, adjust the pH value to 7-9, cool, then dry the cooled components at 100°C-120°C, pulverize, and obtain the modified drilling fluid Starch fluid loss control agent.

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Abstract

The invention particularly provides a modified starch fluid loss additive for drilling fluids, which is composed of the following components in percentage by weight: 60-80% of natural starch, 3-4% of bromoacetic acid, 5-15% of industrial alcohol, 2-7% of sodium hydroxide, 0.1-0.5% of diethylenetriamine, 0.5-1.0% of glacial acetic acid and the balance of water. The modified starch fluid loss additive for drilling fluids has the advantages of favorable water solubility, favorable compatibility and no biological toxicity, effectively lowers the fluid loss of the drilling fluid, is biodegradable, belongs to an environment-friendly product, satisfies the requirements of safe well drilling, productive formation protection, environment protection and the like for the fluid loss additive for drilling fluids in the oilfield large-scale development process, has the characteristics of low raw material cost, simple preparation method and simple required equipment and conditions, and is easy to implement.

Description

technical field [0001] The invention relates to a fluid loss reducer for water-based drilling fluid and a preparation method thereof, in particular to a modified starch fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] With the continuous increase of my country's grain production, natural starch is rich in sources and cheap in price, which provides an effective and new way for the development of low-cost and environmentally friendly fluid loss control agents for drilling fluids. A lot of research has been done on the use of modified starch as a drilling fluid treatment agent at home and abroad, especially the use of modified starch as a fluid loss reducer and viscosity enhancer has made great progress, and a lot of results have been achieved in drilling in different oil and gas fields. It has been reported in the literature that modified starch has good effects in reducing water loss and preventing collapse, coupled with it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/20
CPCC09K8/03C09K8/20
Inventor 黎金明
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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