| 摘要 |
An oil production arrangement comprises an oil reservoir (4), a horizontal wellbore (6) and a vertically extending production well (8). A pump (10) is positioned at the bottom of the production well (8) for pumping fluid along the horizontal wellbore and up the production well for recovery. Tubing (12) having a fluid delivery device (14) at its end is introduced into the production well and moved downwards past the pump (10) and along the horizontal wellbore as far as possible for example close to the toe (not shown) of the wellbore or at least beyond a point in the wellbore at which it is assessed that the hydrocarbon flow has terminated because of a balance between reservoir pressure and wellbore differential pressure being achieved. From the start (or for example as soon as the tubing (12) enters the vertical annular gap between the product well and production tube) of introduction of tubing (12) into the production well and continuously thereafter a fluid is pumped through the tubing so it passes into the production well (8) as the tubing passes therethrough and into the horizontal wellbore (6) as the tubing passes therethrough. The fluid is still pumped into the horizontal wellbore after the tubing has reached its final position deep in the wellbore. The fluid is selected to enhance the mobility of oil and therefore increase the oil production rate. |
