A natural gas huff and puff oil recovery process system and oil recovery method for heavy oil reservoirs
A technology for heavy oil reservoirs and process systems, applied in natural gas huff and puff recovery process systems and oil recovery fields in heavy oil reservoirs, can solve the problems of high energy consumption, expensive operation costs, complex processes and operating procedures, etc., and achieve low energy consumption, The effect of low cost of oil recovery operation and simple process flow
Active Publication Date: 2016-01-06
PETROCHINA CO LTD
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[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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[0028] In order to disclose the purpose, technical means and technical effects of the present invention more completely and clearly, the following is a detailed description, and please refer to the accompanying drawings and component numbers.
[0029] see figure 1 , first introduce the oil recovery process system of the present invention.
[0030] A natural gas huff and puff production process system for heavy oil reservoirs. A set of production string 1 is lowered into the wellbore 5. The production string 1 is sequentially connected with a first oil pipe 7, an oil well pump 20, and an eye pipe from top to bottom. 9. The packer 17 and the second tubing 12; the wellbore 5 has perforation sections at the positions corresponding to the oil layer 8 and the natural gas layer 13, and each perforation section has a plurality of blastholes 19 (or 14); The length of 9 is determined by the material strength of the eye pipe 9, the productivity of the natural gas layer 13, and the thick...
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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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IPC IPC(8): E21B43/16
Inventor 刘雄志罗林杨兆平李忠春吕锡敏魏亮
Owner PETROCHINA CO LTD