Heavy oil reservoir natural gas huff-and-puff oil production process system and oil production method

Abstract

The invention relates to a heavy oil reservoir natural gas huff-and-puff oil production process system and an oil production method. The method comprises the steps of drilling a well in a target area of an oil reservoir, drilling through a stratum layer, an oil layer, an isolating layer and a natural gas layer from the top to the bottom and perforating the oil layer and the gas layer, wherein a shaft is communicated with the oil layer and the gas layer; selecting and determining the length of a perforated pipe and installing a flowmeter, a pressure gauge and a flow control valve; lowering a production string and a cable, wherein the production string is sequentially and serially connected with a first oil pipe, an oil pump, the perforated pipe, a packer and a second oil pipe, and the cable is used for transmitting signals; setting the packer; installing a Christmas tree and an oil pumping unit; closing the well and opening the flow control valve to enable natural gas to flow into the oil layer; closing the flow control valve for soaking; after the design soaking time is reached, opening the well for oil production. The heavy oil reservoir natural gas huff-and-puff oil production process system and the oil production method have the advantages that the high-pressure energy of the natural gas layer is fully utilized, the natural gas is enabled to directly flow into the heavy oil layer from the gas layer through the shaft, the problems of complex process flow, high operating cost and great energy consumption are avoided, the huff-and-puff efficiency of the natural gas is higher and the oil production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a natural gas huff and puff oil recovery process system and oil recovery method for heavy oil reservoirs. Background technique [0002] At present, heavy oil reservoirs are often exploited by methods such as steam injection huff and puff, SAGD, natural gas injection huff and puff, burning oil layers, and lifting with dilution on pumps. Among them, the oil recovery method of natural gas injection huff and puff is mainly to extract the natural gas in the gas layer on the ground to obtain the natural gas source, and then use the compressor to inject the natural gas into the oil layer through the oil well (gas swallowing process), and the natural gas dissolves into the crude oil to reduce the viscosity of the crude oil , and then, open the oil well to produce crude oil and natural gas dissolved in crude oil together (breathing process). [0003] The Tuyuke heavy oil r...

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Problems solved by technology

[0004] The above-mentioned technologies have extremely high requirements on well completion and cementing methods, wellheads and supporting tools, oil production strings and injection-production switching processes. The processes and operating procedures are very complicated, with high operating costs and high energy consumption.

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