Double-pressure single-valve electric control combined production string and its control method

Abstract

The invention relates to the field of oil production fields, and discloses a dual-pressure single-valve electronic-control joint exploitation string and a method for regulating and controlling the same. The dual-pressure single-valve electronic-control joint exploitation string and the method are used during single-pump joint exploitation for two underground oil layers. The dual-pressure single-valve electronic-control joint exploitation string comprises a ground control system, a transmission cable and an underground regulating and controlling system; the underground regulating and controlling system comprises a pressure transmitting oil-well pump, a cable-crossing tubing anchor, a regulating and controlling valve and a cable-crossing packer which are sequentially connected with one another; and the regulating and controlling valve is connected with the ground control system by the transmission cable. The method for regulating and controlling the dual-pressure single-valve electronic-control joint exploitation string mainly includes transmitting an instruction to the regulating and controlling valve of the underground regulating and controlling system via the ground control system; regulating the opening of the regulating and controlling valve; and controlling the quantity of liquid flowing into an oil tube from an upper layer. The dual-pressure single-valve electronic-control joint exploitation string and the method have the advantages that the liquid inlet pressure on the upper layer is reduced, the interlayer interface of the upper layer to a lower layer is reduced, the drawdown pressure of the lower layer is sufficiently enlarged, parameters such as pressure, yields and the like of various layers are regulated via a ground monitoring system in real time, pressure balance points are found, and the purpose of continuous stable joint exploitation production of the two oil layers is achieved.

Description

technical field [0001] The invention relates to a dual-pressure single-valve electronically controlled combined production pipe string and a control method for two sets of oil layers with large differences in physical properties and large spans in a superimposed area in the field of oil production oil fields. Background technique [0002] For oil layers with development potential but with different physical properties and large spans, the lower layer is relatively well developed, and the fluid production rate is relatively high. Single recovery can produce continuously and stably. However, in order to save costs, combined production is generally adopted form. In the prior art, one is to use a single-pump sub-pumping string to isolate two sets of oil layers by using the drop-off string. The pump hanger is located above the top boundary of the lower oil layer, and the production string and the drop-off string are combined by plugging. The two-in-one form realizes simultaneous...

AI Technical Summary

Problems solved by technology

If two oil layers are co-produced with bare pipes, since the pressure of the upper layer is high, the pressure of the lower layer is small, and the span between the two layers is large, the pressure of the upper layer plus the pressure of the hydrostatic column between the two layers will cause serious interlayer interference to the lower layer, making The lower layer is "squeezed to death" and does not produce liquid; if the lower layer is mono-mined, because of its low pressure and rapid drop in liquid production, continuous production cannot be performed, which brings greater difficulty in production management and maintenance, thereby increasing production costs, and cannot be used for various Real-time separate control of layer production fluid, unable to measure layer production and water content, and the lower layer cannot be measured because the packer separates the lower layer

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