Switchable foaming solution for foam drilling and well cleanup on oil and gas field

A technology of oil and gas drilling and foaming fluid, which is applied in the direction of flushing wellbore, wellbore/well parts, earthwork drilling and production, etc., to achieve the effects of easy biodegradation, cost reduction and convenient preparation

Inactive Publication Date: 2013-08-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Foaming aid 0.05-0.1%, compounding agent 0-2%, the rest is water

Method used

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  • Switchable foaming solution for foam drilling and well cleanup on oil and gas field
  • Switchable foaming solution for foam drilling and well cleanup on oil and gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention will be further described below in conjunction with embodiment:

[0014] The switch foaming liquid formula used in the following experiments is as follows (mass percentage): C8-C10 alkyl glycoside (APG) 0.5%, sodium oleate 0.2%, C6-C8 fatty alcohol polyoxyethylene ether sodium sulfate (AES) 0.1% , Ethylene glycol monobutyl ether 0.05%, EDTA 1.0%.

[0015] Foam performance testing. The Waring Blender stirring method was used to test the foam performance of the blowing agent under different conditions. The U.S. petroleum industry often adopts this method, and my country's petroleum industry also adopts this method. The instrument used is a Waring Blender stirrer. During the test, add 100ml of test liquid into a graduated mixing cup, stir at high speed (≧5000rpm) for 60s, turn off the switch, and immediately record the foam volume V (ml), which represents the foaming ability of the foaming agent, the greater the V , the stronger the foaming abilit...

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Abstract

The invention discloses an acid/alkali switchable foaming solution for foam drilling and well cleanup on an oil and gas field, which is prepared by complexing natural nonionic surfactant and anionic surfactant. When the pH value of the solution is higher than 8, stable and abundant foam is generated to take out drill cuttings and other particulate matters from the bottom of a well; when acid is added at a well mouth under the condition of stirring to ensure that the pH value of the solution is lower than 4, the solution is defoamed to become a water solution, and solid particles are separated out; and when the pH value of the separated solution is regulated to 8 or above with alkali, the solution reverts to a foaming solution having favorable property and can be injected to the bottom of the well to foam. Such cycle can be repeated multiple times. Thus, the invention lowers the use cost of chemical agents, saves water and solves the problems such as high separation difficulty, environment pollution and the like.

Description

technical field [0001] The invention relates to a circulating switch foaming fluid in the fields of foam drilling and well washing in oil and gas fields and a use method thereof. Background technique [0002] Foam drilling is an underbalanced drilling technique that uses stable foam as a circulating medium. Foam fluid is a miscible fluid formed by fully mixing foaming base fluid (surfactant aqueous solution) and gas. ROP, reduce soaking time. The foam has a high ability to carry cuttings, and the axial pressure is low, which greatly avoids repeated crushing of cuttings, significantly improves the working conditions of the drill bit, and thus greatly prolongs the life of the drill bit. In addition, foam drilling has obvious advantages over conventional mud drilling in terms of oil and gas shows and reducing engineering accidents. [0003] During the production of oil and gas fields, with the continuous production of oil and gas, sand and scale in the well will be produced,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38C09K8/536E21B21/14E21B21/06
Inventor 赵晓东
Owner SOUTHWEST PETROLEUM UNIV
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