FIELD: oil and gas production.
SUBSTANCE: in compliance with this method, well is equipped with casing string and flow string with check valve at its bottom. Second smaller-diameter flow string with check valve at its bottom is fitted inside first flow string. Water is lifted via second flow string annulus by gas injected cyclically into annulus. Note here that fluid level in said annulus is not allowed to drop to smaller-diameter flow string bottom. To force fluid influx from the bed, required-pressure gas is forced in depressor-repressor mode into annulus at closed shutoff valves in exhaust line.
EFFECT: simplified process, better ecology, rediced losses.
1 dwg
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