Solid foam drainage agent applied to gas field

Abstract

The invention relates to a solid foam drainage agent, which is composed of the following raw materials in percentage by mass: 40-50% of surfactant, 5-20% of sodium carbonate and 40-55% of sodium dihydrogen phosphate. The solid foam drainage agent disclosed by the invention is strong in foaming capacity, rich in foam, high in foam moisture content and high liquid load, and is excellent in salt, methanol and oil resistance; the solid foam drainage agent shows good compatibility with underground auxiliaries and is quite stable in product performance; foam drainage success rate in a field test is quite high; and the solid foam drainage agent is applicable to shaft drainage in natural gas extraction, and in particular to gas wells of high temperature (100 DEG C), highly condensate oil (less than or equal to 50%), methanol resistance (less than or equal to 30%) and high salinity (less than or equal to 200000mg / L).

Description

technical field [0001] The invention relates to a solid foam drainage agent used in gas fields, in particular to a solid foam drainage agent capable of spontaneous foam drainage, and belongs to the technical field of oilfield chemistry. Background technique [0002] With the continuous development of gas fields, the water output of gas reservoirs and the number of gas wells are increasing, and problems such as fluid accumulation in the wellbore of gas wells and water output affecting the normal production of gas wells have gradually emerged; water output from gas wells has transformed single-phase gas seepage into gas-water two-phase seepage , not only reduces the gas phase permeability, but also consumes a lot of formation energy, and the uncarried fluid in the wellbore reduces the production pressure difference, resulting in low production or even shutdown of the gas well. With the deepening of development, the number of gas wells is increasing, and most of the gas wells a...

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Problems solved by technology

[0002] With the continuous development of gas fields, the water output of gas reservoirs and the number of gas wells are increasing, and problems such as fluid accumulation in the wellbore of gas wells and water output affecting the normal production of gas wells have gradually emerged; water output from gas wells has transformed single-phase gas seepage into gas-water two-phase seepage , not only reduces the permeability of the gas phase, but also consumes a lot of formation energy, and the uncarried fluid in the wellbore reduces the production pressure difference, resulting in low production or even shutdown of the gas well.

With the deepening of development, the number of gas wells is increasing, and most of the gas wells are medium and low-yield wells. Due to the low production rate and the large and discontinuous production of formation fluid, these wells have poor liquid-carrying capacity and serious fluid accumulation in the well; even For wells with high productivity, it is also difficult to carry liquid due to the formation of a lot of liquid or the large pipe string

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