High-temperature solid foam draining agent and preparation method

Abstract

The invention relates to the technical field of oil production engineering for oil fields, provides a high-temperature solid foam draining agent for drainage gas recovery for gas wells and a preparation method of the foam draining agent and is researched to solve the problems that high-temperature deep gas well foam draining agents have reduced performance, are poor in draining effect and inconvenient to store and fill in winter and the like. The high-temperature solid foam draining agent is prepared from, in percentage by weight, 20%-30% of alkyl sulfate, 10%-15% of ammonium lauryl sulfate C12H25SO4NH4, 25%-35% of stearic acid C18H36O2, 8%-12% of sodium carbonate Na2CO3 and the balance of water. The invention further provides the preparation method of the foam draining agent. The foam draining agent is suitable for deep gas wells with the well temperatures larger than or equal to 120 DEG C or the well depths larger than or equal to 3,500 m, is particularly applied to continuous production and intermittent draining gas wells and has the advantages of being good in foaming performance and high in foam stability at the high temperature, convenient to store and transport, small in pollution and the like.

Description

technical field [0001] The invention relates to the technical field of oilfield oil production engineering, and provides a high-temperature solid foam discharge agent for gas well drainage and gas production and a preparation method. Background technique [0002] After the gas well produces water, it gradually becomes an intermittent well, or even stops production, and requires drainage gas recovery technology to resume production. Foam drainage is a simple, cost-effective drainage and gas recovery technology. At present, the commonly used foam discharge agents are all liquid types. When the well temperature is ≥ 120 °C and the well depth is ≥ 3500 m, the foam performance will decrease, and the drainage effect will become worse; during construction, a dosing pump at the wellhead needs to be set up by manual operation. It is not suitable for gas wells of high temperature; it thickens or solidifies under low temperature conditions, and it is inconvenient to store and refill i...

AI Technical Summary

Problems solved by technology

At present, the commonly used foaming agents are all liquid type. Under the conditions of well temperature ≥ 120 ℃ and well depth ≥ 3500m, the foam performance will decrease and the drainage effect will become poor; during construction, it is necessary to set up a dosing pump at the wellhead and fill it manually. For intermittent drainage Not suitable for gas wells; thickening or solidification under low temperature conditions, inconvenient storage and filling in winter

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