Composite bactericidal foaming agent for shale gas foam well as well as preparation method and application of composite bactericidal foaming agent

A technology of foaming agent and air bubbles, which is applied in the field of compound bactericidal foaming agent and its preparation, can solve the problems affecting the foam performance of the foaming agent, achieve good anti-corrosion effect, and solve the problems of foam drainage and bacterial corrosion

Pending Publication Date: 2022-07-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned foaming agent does not involve the use of compatibility with fungicides and corrosion inhibitors
Some foaming agents have compatibility problems with fungicides and corrosion inhibitors, and the use of them at the same time will affect the foam performance of the foaming agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The present embodiment provides a composite bactericidal foaming agent for shale gas foam wells and a preparation method thereof, as follows:

[0036] From 30% cocamidopropyl betaine, 1% C16 alkyl propyl betaine, 0.1% C18 alkyl propyl betaine, 5% glutaraldehyde, 1% polyvinyl alcohol 388 (degree of polymerization 300, alcoholysis 88%), 1% ethylene glycol, 6% N-benzylquinoline salt, 1% hexamethylenetetramine, 54.9% deionized water to prepare foaming agent. At 90℃, 1.0g / L dosage, foaming power (initial foam height) 188mm, foam stability (5min foam height) 178mm, liquid carrying capacity 156mL / 15min, sterilization rate of sulfate-reducing bacteria, iron bacteria and saprophytic bacteria 100%.

Embodiment 2

[0038] The present embodiment provides a composite bactericidal foaming agent for shale gas foam wells and a preparation method thereof, as follows:

[0039] Consisting of 30% cocamidopropyl dimethyl betaine, 1% C16 alkyl propyl betaine, 0.1% C18 alkyl propyl betaine, 5% glutaraldehyde, 1% polyvinyl alcohol 588 (degree of polymerization 500 , alcoholysis degree 88%), 1% ethylene glycol, 4% N-benzyl quinoline salt, 3% hexamethylenetetramine, 54.9% deionized water to prepare foaming agent. At 90℃ and 1.0g / L dosage, foaming power (initial foam height) 192mm, foam stability (5min foam height) 185mm, liquid carrying capacity 154mL / 15min, sterilization rate of sulfate-reducing bacteria, iron bacteria and saprophytic bacteria 100%.

Embodiment 3

[0041] The present embodiment provides a composite bactericidal foaming agent for shale gas foam wells and a preparation method thereof, as follows:

[0042] From 25% cocamidopropyl betaine, 5% cocamidopropyl dimethyl betaine, 3% glutaraldehyde, 2% formaldehyde, 1% polyvinyl alcohol 388 (degree of polymerization 300, degree of alcoholysis 88% ), 1% ethylene glycol, 5% N-benzylquinoline salt, 2% hexamethylenetetramine, 56% deionized water to prepare foaming agent. At 90℃, 1.0g / L dosage, foaming power (initial foam height) 198mm, foam stability (5min foam height) 195mm, liquid carrying capacity 162mL / 15min, sterilization rate of sulfate-reducing bacteria, iron bacteria and saprophytic bacteria 100%.

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Abstract

The invention provides a composite bactericidal foaming agent for a shale gas foam well as well as a preparation method and application of the composite bactericidal foaming agent. The composite bactericidal foaming agent is prepared from the following components in parts by mass: 25 to 35 parts of betaine zwitterionic surfactant, 0 to 10 parts of fatty alcohol polyoxyethylene sulfate, 1 to 10 parts of C1-C5 aldehyde compound, 0 to 10 parts of quaternary ammonium salt surfactant, 0.5 to 2 parts of polyvinyl alcohol, 1 to 4 parts of C2-C3 alcohol compound, 4 to 8 parts of quinoline salt, 1 to 3 parts of hexamethylenetetramine and 50 to 60 parts of water. The composite bactericidal foaming agent has good compatibility and can solve the problems of foam drainage of a shale gas well and bacterial corrosion of an oil casing.

Description

technical field [0001] The invention relates to the field of shale gas foam drainage and gas production, in particular to a composite bactericidal foaming agent for shale gas foam wells, a preparation method and application. Background technique [0002] In the production of shale gas, the gas production of gas wells decreases, and the ability to carry liquid is reduced. The gas well's own ability cannot bring liquid out of the formation in time. It is necessary to use technologies such as foam drainage and gas production to assist in carrying liquid. Foam drainage gas production is to inject a foaming agent into the bottom of the gas well, and form foam under the agitation of airflow, reduce density, reduce slippage, improve the efficiency of air flow with liquid, and allow the accumulated liquid to be carried out of the wellbore in the form of foam. Adding defoamer to make the foam defoamed into liquid, and then separating the gas and liquid in the separator is the most ec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/54A01N33/12A01N35/02A01P1/00
CPCC09K8/584C09K8/54A01N33/12A01N35/02C09K2208/32
Inventor 蒋泽银杜国佳陈力力陈礼利陈娟
Owner PETROCHINA CO LTD
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