Multi-element thermal fluid auxiliary gravitational displacement process
A multi-component thermal fluid and auxiliary gravity technology, which is applied in the fields of production fluids, wellbore/well components, earth-moving drilling, etc., which can solve the problem of high processing costs of high-temperature produced fluids, increased temperature, and difficulty in guaranteeing the dryness of bottom-hole steam. problems, to achieve the effect of improving thermal efficiency and economic benefits, increasing displacement and oil drainage, and enriching the mechanism of crude oil viscosity reduction
A multi-component thermal fluid and auxiliary gravity technology, which is applied in the fields of production fluids, wellbore/well components, earth-moving drilling, etc., which can solve the problem of high processing costs of high-temperature produced fluids, increased temperature, and difficulty in guaranteeing the dryness of bottom-hole steam. problems, to achieve the effect of improving thermal efficiency and economic benefits, increasing displacement and oil drainage, and enriching the mechanism of crude oil viscosity reduction
CN102587878AActive Publication Date: 2012-07-18CHINA NAT OFFSHORE OIL CORP +1
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[0030]The general principle of the present invention is explained below by taking a certain offshore heavy oil well in Bohai Bay as an example, but it should be noted that the present invention is by no means limited to offshore heavy oil wells.
[0031] The reservoir depth is 1000m, the crude oil viscosity at the reservoir temperature is 13000mPa·s, the original formation pressure is about 10.0MPa, the oil layer thickness is 35-45m, and there is 5-10m bottom water, and the horizontal permeability is 2-3μm 2 , the ratio of vertical permeability to horizontal permeability is 0.3-0.5, the porosity is 33%, and the oil saturation is 71%.
[0032] 1. Well layout parameters
[0033] Produced by combining double horizontal wells, such as image 3 As shown, the vertical distance between the horizontal injection well 1 and the overlying strata is 4m. In order to prevent bottom water coning, the horizontal production well 2 is deployed at a place 7m above the oil-water contact, and the...
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The invention provides multi-element thermal fluid auxiliary gravitational displacement process for extracting ultra-thick or super-thick oil reservoirs. The multi-element thermal fluid auxiliary gravitational displacement process includes arranging a horizontal injection well on the upper portion of a thick oil reservoir and arranging a horizontal production well on the lower portion of the thick oil reservoir; and injecting multi-element thermal fluid from the injection well after circularly preheating the injection well and the production well, and then extracting thick oil from the production well. Crude oil viscosity break mechanism and oil extracting power of the multi-element thermal fluid auxiliary gravitational displacement process are rich, accordingly the use level of steam and steam and oil ratio in an extraction process are reduced, and thermal efficiency and economic benefit are improved.
Description
technical field [0001] The invention relates to the field of oil recovery technology, and in particular to a multi-element thermal fluid assisted gravity displacement process for developing super-thick or extra-thick heavy oil reservoirs. Background technique [0002] Steam-assisted gravity drainage (SAGD for short) is considered to be the thermal recovery method with the greatest potential to replace steam stimulation. From the perspective of oil recovery mechanism, SAGD uses steam as a heat source, combines heat conduction and heat convection, and relies on the gravity of crude oil and condensate to recover heavy oil, and the recovery rate can reach 50% to 70%. Super heavy oil production method. At present, SAGD technology has been successfully commercialized in Canada and Venezuela, and more than 20 pilot test areas of gravity drainage have been carried out in different types of oil fields, and 5 commercial oil fields have been built. In 2005, China's Liaohe Oilfield an...
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Patent Timeline
18 Jul 2012
Publication
CN102587878A
- IPC
- E21B43/24; E21B43/22
- Inventors
- 孙永涛; 孙玉豹