A slow-release liquid-carrying sand-carrying foam discharge agent and its preparation method

Abstract

The invention belongs to the technical field of drainage of natural gas wells, and in particular relates to a slow-release liquid-carrying sand-carrying foam drainage agent and a preparation method thereof. The present invention uses fatty alcohol polyoxyethylene ether sodium sulfate, cocamidopropyl betaine, fatty alcohol polyoxyethylene ether, octadecyl dihydroxyethyl betaine, cetyltrimethylammonium bromide, poly Vinyl alcohol and sausage casing are prepared in four steps of adding fatty alcohol polyoxyethylene ether sodium sulfate into the mixer, adding other components into the mixer, standing and solidifying in a certain proportion. , has good salt tolerance, anti-mineralization degree, and has a slow release effect. The foaming agent dissolves slowly, can carry liquid and sand, and carry sand and water out of the wellbore at the same time, ensuring the normal production of the gas well.

Description

technical field [0001] The invention belongs to the technical field of drainage of natural gas wells, and in particular relates to a slow-release liquid-carrying sand-carrying foam drainage agent and a preparation method thereof. Background technique [0002] Gas fields in my country have a large number of wells and complex distribution of gas and water in formations. With the continuous large-scale development of gas fields, the water yield and the number of gas wells are increasing, and the problem of fluid accumulation and water yield in the wellbore of gas wells affecting the normal production of gas wells is gradually emerging. After a long period of production, under the influence of bottom water and edge water coning, etc., the situation of water discharge and even water flooding of gas wells has gradually become serious, which has become one of the key factors restricting the normal production of gas wells. At the same time, due to geographical location factors, gas ...

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Problems solved by technology

At the same time, due to geographical location factors, gas fields often become "three low" gas fields. Most gas wells must undergo fracturing to meet the requirements of industrial gas flow. Some sandstone formations also have sand production, which submerges the production layer, aggravates the sand production of gas wells, and seriously interferes with the production of gas wells

[0003] At present, foam drainage and gas recovery have become the main measures for drainage of gas wells in gas fields. However, with the emergence of complex water and sand production in gas wells, some of the currently used foam drainage agents have failed, and their performance has been greatly reduced. Increased production costs. For example, in some gas fields, wellbore produced water now has the characteristics of sand, high condensate oil, high salinity, etc., and the temperature difference varies greatly between seasons. Unable to raise the situation occurs

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