| 摘要 |
FIELD: oil and gas production. ^ SUBSTANCE: in compliance with proposed method, bed around operating string is isolated by parker to be placed in annulus between said string and casing string so that said annulus is divided into top and bottom annuluses. Return channel is made for flow from bed via parker, from bottom annulus to top annulus. Fluid is injected from surface via operating string and returned via said return channel to surface. Return channel is selectively closed by using valve in bottom annulus in injecting fluid actuated by pressure increase in bottom annulus or in by increase of fluid rate in bottom annulus. ^ EFFECT: higher efficiency. ^ 12 cl, 1 dwg |
