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Gel-type extracting agent for drilling fluid or well completion fluid and preparation method thereof

A kind of cutting agent and gel-type technology, which is applied in the field of gel-type cutting agent and its preparation, can solve the problems of weak sand-carrying ability, large environmental pollution, difficult biodegradation, etc., and achieve excellent lubricity and inhibition, Improved cutting performance and strong sand-carrying ability

Inactive Publication Date: 2010-04-14
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] This product is aimed at conventional drilling fluid cutting agents (such as: HV-CMC, HEC, etc.) that cannot meet the requirements of low shear rate and high viscosity required by solid-free drilling fluid system, weak sand-carrying ability, difficult to biodegrade, use It was developed after the environmental pollution and other problems. It can solve the problems of high clay content in the conventional drilling fluid system, which seriously affects the drilling progress, damages the oil and gas layers, pollutes the environment, and is difficult to dispose of waste drilling fluid. It can be effectively used Protect oil and gas reservoirs and enhance oil recovery

Method used

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  • Gel-type extracting agent for drilling fluid or well completion fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Add 7.5g surfactant OP-10 in 142.5ml tap water, prepare 5wt% surfactant OP-10 aqueous solution;

[0040] (2) Add 150g 5wt% surfactant OP-10 aqueous solution into the reaction kettle, add 100g xanthan gum while stirring, and activate the reaction for 7h at a temperature of 80-90°C;

[0041] (3) After the activated product is dried at 105°C, crushed and passed through a 200-mesh sieve, an intermediate product is obtained.

[0042] (4) Take 40.0g of the intermediate product and compound it with 50.0g of HV-CMC and 10.0g of potassium formate to obtain 100.0g of the gel-type cutting agent product.

Embodiment 2

[0044] (1) Add 7.5g surfactant AEO-3 in 142.5ml tap water, prepare 5wt% surfactant AEO-3 aqueous solution;

[0045](2) Add 150g of 5wt% surfactant AEO-3 aqueous solution into the reaction kettle, add 100g of xanthan gum while stirring, and activate the reaction for 7h at a temperature of 80-90°C;

[0046] (3) After the activated product is dried at 105°C, crushed and passed through a 200-mesh sieve, an intermediate product is obtained.

[0047] (4) Take 50.0g of the intermediate product and compound it with 40.0g of LV-CMC and 10.0g of sodium formate to obtain 100.0g of the gel-type cutting agent product.

Embodiment 3

[0049] (1) Add 7.5g surfactant AEO-9 to 142.5ml tap water to prepare 5wt% surfactant AEO-9 aqueous solution;

[0050] (2) Add 150g of 5wt% surfactant AEO-9 aqueous solution into the reaction kettle, add 100g of xanthan gum while stirring, and activate the reaction for 7h at a temperature of 80-90°C;

[0051] (3) After the activated product is dried at 105°C, crushed and passed through a 200-mesh sieve, an intermediate product is obtained.

[0052] (4) Take 60.0g of the intermediate product and compound it with 30.0g of CMS and 10.0g of citric acid to obtain 100.0g of the gel-type cutting agent product.

[0053] The performance evaluation method of embodiment product:

[0054] 1. Evaluation of the gelling performance of the products of the examples

[0055] Add 148ml of water into a 200ml beaker, turn on the stirrer at a speed of 3000r / min, and add 2.0g of the product of the example while stirring. After the product is completely added, continue stirring for 10min, and after ...

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Abstract

The invention provides a gel-type extracting agent for drilling fluid or well completion fluid and a preparation method thereof, wherein the gel-type extracting agent comprises intermediate product P, cellulose or starch modifier and high temperature resistance oxidant which are compounded, wherein the intermediate product P is formed through utilizing biological polymer as raw materials and activating by surface activator water solution, the cellulose modifier chooses carboxymethyl cellulose, middle viscosity carboxymethyl cellulose sodium salt and low viscosity carboxymethyl cellulose sodium salt, the starch modifier chooses sodium carboxymethylstarch, cationic starch and oxygen starch, and the high temperature resistance oxidant chooses one or two of sodium formate, potassium formate, cesium formate and citric acid, and the biological polymer chooses one or two of xanthan gum, guar gum and pectin.

Description

technical field [0001] The invention relates to a gel type cutting agent for drilling fluid or well completion fluid and a preparation method thereof. The invention belongs to the technical field of oil and gas field drilling in the petroleum industry. Background technique [0002] Early cutting agents commonly used in domestic oilfields include: xanthan gum, guar gum, carboxymethyl cellulose (HV-CMC), hydroxyethyl cellulose (HEC) and synthetic organic compounds (composite ionic acrylate PAC, poly Acrylamide PAM, etc.). These cutting agents can only be used in conventional drilling fluids, mainly bentonite drilling fluid systems. In addition, some of them are too high in price, poor in cost performance, difficult to biodegrade, and difficult to dispose of waste drilling fluid in the later stage, all of which limit their widespread use. [0003] With the continuous development of oil drilling technology, drilling fluid technology also develops and progresses. At present, ...

Claims

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Application Information

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IPC IPC(8): C09K8/34C09K8/08
Inventor 谢水祥蒋官澄陈勉史建刚邓皓王蓉沙胥洪彪
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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