Supercritical CO2 huff-and-puff oil recovery method for dense oil reservoir
A tight oil, supercritical technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of reducing the oil recovery rate of tight oil reservoirs and ineffective plugging of tight oil reservoirs
Inactive Publication Date: 2018-10-16
PETROCHINA CO LTD
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Problems solved by technology
However, this mining method is not suitable for tight oil reservoirs, and it is easy to form an invalid seal to tight oil reservoirs, thereby reducing the oil recovery rate of tight oil reservoirs
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] figure 1 It is a kind of tight oil reservoir supercritical CO of the present invention 2 Schematic diagram of the application scenarios of the huff and puff oil recovery method, including:
[0033] Supercritical CO 2 Tank 1, used to configure and store supercritical CO 2 mixed fluid;
[0034] The surface injection device 2 is used...
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The invention provides a supercritical CO2 huff-and-puff oil recovery method for a dense oil reservoir. The supercritical CO2 huff-and-puff oil recovery method comprises the steps that the dense oil reservoir in an oil well is subjected to hydraulic fracturing; a pre-heated chemical fluid is injected into the dense oil reservoir; a supercritical CO2 mixed fluid is injected into the dense oil reservoir; a water solution is injected into the dense oil reservoir; well shutdown is conducted according to the preset time length; and the well is opened for production. The pre-heated chemical fluid ismixed with crude oil and heats the crude oil, so that the fluidity of the crude oil is improved; then the supercritical CO2 mixed fluid and the heated crude oil are mixed, thus the density of the crude oil is decreased, the viscosity is decreased, and the fluidity is further enhanced, so that the recovery rate of the crude oil is increased; and meanwhile, the supercritical CO2 mixed fluid and thewater solution permeating into a water layer of the dense oil reservoir are mixed, then CO2 emulsion is formed in the water layer so as to block the water layer, water in the water layer is preventedfrom entering the oil well, and thus the recovery rate of the crude oil is further increased.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a supercritical CO 2 Huff and puff oil recovery method. Background technique [0002] With the rapid development of science and technology, especially the development of hydraulic fracturing and horizontal well technology, it has become possible to exploit unconventional oil and gas resources. As a kind of unconventional oil and gas resources, tight oil is now abundant due to its abundant reserves in the world. More and more attention has been paid. [0003] Tight oil refers to the oil accumulation formed without large-scale long-distance migration in tight oil reservoirs sandwiched in or close to high-quality oil-generating formations. It is a large-area continuous distribution of petroleum resources that coexist with or are closely adjacent to oil-generating rocks. , the reservoir lithology mainly includes tight sandstone, tight limestone and carbonate r...
Claims
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Login to View More IPC IPC(8): E21B43/24E21B43/16
CPCE21B43/164E21B43/24
Inventor 刘己全宋文文陈庆国王鹏卢培华
Owner PETROCHINA CO LTD