Separate layer steam injection pipe column of thermal recovery straight inclined shaft in general sand preventing condition and method

Abstract

The invention discloses a separate layer steam injection pipe column of a thermal recovery straight inclined shaft in a general sand preventing condition and a method. The separate layer steam injection pipe column comprises a top packer, an underground thermal expansion compensator and at least two flow regulators which are successively connected onto an oil pipe from top to bottom. The at leasttwo flow regulators separately correspond to different oil layers, and an interlayer packer is arranged between every two flow regulators; the upper end of the interlayer packer is connected to a liquid phase separator in a screw thread manner, each liquid phase separator comprises an outer pipe and an inner pipe, rotational flow blades are arranged on the inner wall of the outer pipe, the upper half section of the inner pipe enters the outer pipe, the inner pipe is located below the rotational flow blades, axial liquid phase nozzles are also arranged on the inner wall of the outer pipe, the liquid phase nozzles are located in an annulus formed by the outer pipe and the inner pipe, and gas phase critical flow nozzles are arranged on the inner wall of the inner pipe. By means of a density difference between gas and liquid phases, liquid phase separation of a certain thickness is established between the sand-preventing pipe column and a casing, so that upper and lower oil layers are packed effectively in the general sand preventing condition.

Description

technical field [0001] The invention relates to a steam injection process for thermal recovery of heavy oil produced in an oil field, in particular to a layered steam injection pipe column and a method for thermal recovery straight inclined well under general sand control. Background technique [0002] Thermal oil recovery is one of the important methods for the development of heavy oil reservoirs, and steam huff and puff and steam flooding are the most widely used. More than 80% of the heavy oil in Shengli Oilfield is multi-layered reservoirs. General steam injection is generally used in the development of vertically inclined wells for thermal recovery. The difference in steam absorption between layers is large, and the conflict between layers is prominent. Especially when the physical parameters of the upper layer are obviously due to the lower layer, the steam overlapping causes the upper layer to have high dryness, and the good physical parameters cause the upper layer t...

AI Technical Summary

Problems solved by technology

This device only realizes layered steam injection under the condition of layered sand control, and cannot realize layered steam injection in general sand control wells. At the same time, due to the difference in steam injection pressure of each layer, the dryness of steam injection in each layer is different, resulting in some waste of heat

[0005] To sum up, the current layered steam injection technology and method are mainly suitable for chemical sand control or layered sand control thermal recovery steam injection wells, and layered steam injection of thermal recovery vertically inclined wells for general sand control cannot be realized

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