Balanced production string and technology of thermal recovery horizontal well

Abstract

The invention discloses a balanced oil extraction pipe column and a balanced oil extraction technology of a thermal horizontal well. The balanced oil extraction pipe column comprises a vertical oil pipe or a heat insulation oil pipe, a thermal extraction and separate extraction combination pump, a change-over oil pipe and a horizontal oil pipe, wherein the vertical oil pipe or the heat insulation oil pipe, the thermal extraction and separated extraction combination pump, the change-over oil pipe and the horizontal oil pipe are sequentially connected from the well head to the well bottom; the middle outer wall of the horizontal oil pipe is provided with a packing cup heat-resisting packer in a sleeving way; an annular space between the horizontal oil pipe and a sleeve is divided into a horizontal oil pipe front section and a horizontal oil pipe rear section which are not mutually communicated through the packing cup heat-resisting packer; the horizontal oil pipe rear section is provided with a screen pipe; crude oil in the horizontal oil pipe rear section enters the inner part of the horizontal oil pipe through the screen pipe and is separately extracted by the thermal extraction and separate extraction combination pump; crude oil in the horizontal oil pipe front section is separately extracted by the thermal extraction and separated extraction combination pump through the annular space between the horizontal oil pipe and the sleeve. According to the balanced oil extraction pipe column disclosed by the invention, a seepage state and the pressure distribution during a thermal extraction process of a horizontal section can be changed, and a heavy oil thermal horizontal well section can be totally extracted, so that the purpose of balanced oil extraction can be achieved.

Description

technical field [0001] The invention relates to oil exploitation technology, in particular to a thermal recovery horizontal well balanced oil recovery pipe string and a technique. Background technique [0002] Shengli Oilfield is rich in heavy oil resources. By the end of 2010, the proven area of ​​heavy oil reservoirs in Shengli Oilfield (excluding Bamianhe) was about 232km 2 , the proven reserves are about 526 million tons, the cumulative proven heavy oil reserves are 1.571 billion tons, the thermal recovery reserves are 611 million tons, and 483 million tons have been used. In 2010, the heavy oil production was 4.21 million tons. proportion is increasing. [0003] 98% of the productive reserves of Shengli heavy oil reservoirs are developed by steam stimulation, while the average recovery rate is less than 18%. With the reduction of the number of new drilling wells and new production capacity, it is urgent to improve the recovery rate of steam stimulation. Due to the het...

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