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Foaming agent for oilfield, and preparation method thereof

A foaming agent, oil field technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of low foaming amount, inability to achieve the use effect, poor foam stabilization effect, etc. High foam quality, small and stable foam

Active Publication Date: 2015-06-10
陕西延长石油油田化学科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a foaming agent for oilfields, which solves the problems that the existing foaming agents for oilfields have low foaming volume, poor foam stabilization effect, and cannot achieve the use effect under high salinity and high temperature conditions.

Method used

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Examples

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preparation example Construction

[0019] The present invention also provides the preparation method of the above-mentioned oil field foaming agent, which is specifically implemented according to the following steps:

[0020] Step 1, weigh the following raw materials by mass percentage: dodecyl dimethyl betaine 10%~20%, lauramidopropyl betaine 5%~15%, octadecyl glucoside 3%~10%, butanediol 1% to 5%, deionized water 55% to 80%, the sum of the above components is 100%;

[0021] Step 2, add the dodecyl dimethyl betaine weighed in step 1 into the reaction kettle, stir and heat up to 40 ° C, add lauramidopropyl betaine and octyl decyl glucoside in turn, stir for 0.5 to 1 h, and then sequentially Add deionized water and butanediol, and continue stirring for 1-2h;

[0022] Step 3, reduce the stirring speed, add a pH adjuster citric acid or sodium carbonate according to the pH of the mixed solution, adjust the pH of the solution to 6-8, and obtain a foaming agent when the solution is lowered to room temperature.

Embodiment 1

[0024] Weigh 150kg of dodecyl dimethyl betaine and add it to the reaction kettle, stir and heat up to 40°C, add 150kg of lauryl amidopropyl betaine and 100kg of octyl decyl glucoside in turn and continue to stir, stir for 0.7h, then add 550kg in turn The deionized water and 50kg of butanediol were continuously stirred for 1.5h, the stirring speed was reduced, 10kg of citric acid was added, the pH of the solution was adjusted to 6, and the foaming agent was obtained when the solution was lowered to room temperature.

[0025] Take 0.5ml of the above foaming agent and add it to 100ml of deionized water, stir at 9000r / min for 1 minute, pour it into a 500ml measuring cylinder and observe that the foam volume is 465ml and the half-life is 6.5 minutes. Similarly, take 0.5ml of the above foaming agent and add it to 100ml with a salinity of 20×10 4 mg / L of mineralized water, stir at 9000r / min for 1 minute, pour it into a 500ml graduated cylinder, observe that the foam volume is 465ml, ...

Embodiment 2

[0027] Weigh 200kg of dodecyl dimethyl betaine and add it to the reaction kettle, stir and heat up to 40°C, add 100kg of lauryl amidopropyl betaine and 30kg of octyl decyl glucoside in turn and continue to stir, stir for 0.5h, and then add 640kg in turn The deionized water and 30kg of butanediol were continuously stirred for 1h, the stirring speed was reduced, 10kg of sodium carbonate was added, the pH of the solution was adjusted to 8, and the foaming agent was obtained when the solution was lowered to room temperature.

[0028] Take 0.5ml of the above foaming agent and add it to 100ml of deionized water, stir at 9000r / min for 1 minute, pour it into a 500ml measuring cylinder and observe that the foam volume is 465ml and the half-life is 7 minutes. Similarly, 0.5ml of the above foaming agent was added to 100ml of deionized water, heated to 130 ° C, and then stirred at 9000r / min for 1 minute, poured into a 500ml graduated cylinder and observed that the foam volume was 430ml, an...

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Abstract

The invention discloses a foaming agent for oilfield. The foaming agent is prepared from the following raw materials in percentage by mass: 10%-20% of dodecyl dimethyl betaine, 5%-15% of lauramidopropyl betaine, 3%-10% of caprylyl / capryl glucoside, 1%-5% of butanediol, and 55%-80% of deionized water, wherein the sum of weight percentages of the components is 100%. The invention further discloses a preparation method of the foaming agent. The foaming agent for oilfield can be used for oil-gas field development operation of oil-gas well drilling, oil-gas well pigging and washing, gas well cracking, gas well drainage and gas recovery and the like, especially for the ultralow-permeability oil-gas area in the north of Shanxi province, the foaming agent has a good foaming effect in stratum water with the mineralization degree of 20*10<4>mg / L and the stratum with the temperature of 130DEG C, and has obvious commercial effect in practical site use.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development engineering, relates to a foaming agent for oil fields, and also relates to a preparation method of the above foaming agent. Background technique [0002] In oil well cleaning and well drilling operations, it is necessary to add a certain concentration of foaming agent to the well cleaning fluid, which is beneficial to reduce the surface and interfacial tension of the well cleaning fluid and increase the scope of well cleaning. The pump pressure is reduced, and the resulting foam also carries insoluble dirt and small particles out of the wellbore, thereby improving and restoring well production. [0003] Adding foaming agent in the process of gas production in gas wells is beneficial to reduce the surface tension of formation water and wellbore liquid column density, improve the flow state of water and gas, and achieve the purpose of drainage and gas production. Reduce the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/536C09K8/584C09K8/70
CPCC09K8/035C09K8/52C09K8/584C09K8/602C09K8/703
Inventor 向礼勇李慧邓永刚
Owner 陕西延长石油油田化学科技有限责任公司
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