Heavy oil thermal recovery steam injection device and heavy oil thermal recovery method
A thermal recovery and steam injection technology for heavy oil, applied in the field of oil and gas wells, can solve the problems of poor heating, inability to uniformly heat the horizontal wellbore, and low production efficiency, so as to improve heating efficiency, avoid edge-bottom water coning, and improve production efficiency Effect
Active Publication Date: 2018-05-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
This method is to inject hot steam at both ends of the horizontal well at the same time. For longer horizontal wells, the formation far away from the hot steam injection point is also poorly heated, and due to the strong anisotropy of the formation thermal conductivity , resulting in the inability to heat the entire horizontal wellbore evenly, which in turn leads to the problem of low production efficiency
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[0026] The present invention will be further described below in conjunction with accompanying drawing.
[0027] figure 1 The structure of the steam injection device 100 for heavy oil thermal recovery (hereinafter referred to as the device 100 ) according to the present invention is schematically shown. like figure 1 As shown, the device 100 includes a steam injection inner pipe 1 and a steam injection outer pipe 3 sleeved outside the steam injection inner pipe 1 . Preferably, the steam injection inner pipe 1 and the steam injection outer pipe 3 are arranged coaxially. Both ends of the steam injection outer pipe 3 are sealed and connected to the outer surface of the steam injection inner pipe 1 respectively. Between the steam injection inner pipe 1 and the steam injection outer pipe 3, a plurality of packers 4 are arranged at intervals to divide the space between the steam injection inner pipe 1 and the steam injection outer pipe 3 into a plurality of disconnected injection ...
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The invention relates to a steam injection device for thermal recovery of heavy oil and a thermal recovery method for heavy oil. The steam injection device for heavy oil thermal recovery includes a steam injection inner pipe and a steam injection outer pipe with a gas outlet sheathed outside the steam injection inner pipe. The two ends of the steam injection outer pipe are respectively sealed with the outer surface of the steam injection inner pipe. A plurality of packers are set between the steam injection inner pipe and the steam injection outer pipe at intervals to divide the space between the steam injection inner pipe and the steam injection outer pipe into multiple disconnected steam injection sections. Pressure valves with different opening pressures are provided in the area of each steam injection section of the steam injection inner pipe. Using the steam injection device for heavy oil thermal recovery of the present invention can make the horizontal wellbore evenly heated, and help to improve the production efficiency of heavy oil.
Description
technical field [0001] The invention relates to the field of oil and gas wells, in particular to a steam injection device for thermal recovery of heavy oil. The invention also relates to a heavy oil thermal recovery method using the device. Background technique [0002] Heavy oil is crude oil with high asphaltene and colloid content and high viscosity. In today's energy shortage, the exploitation of heavy oil is getting more and more attention. However, due to the poor fluidity of heavy oil, the development of heavy oil has become a worldwide problem. [0003] At present, heavy oil is usually developed by injecting hot steam into horizontal wells in thermal recovery of heavy oil. This development method mainly has the following methods: [0004] (1) Single tube injection of hot steam. For longer horizontal wells, usually only the formations around the hot steam injection point can be heated well, while the formations far away from the hot steam injection point are poorl...
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IPC IPC(8): E21B43/24
Inventor姚凯张同义李晓益朱明王钧
OwnerCHINA PETROLEUM & CHEM CORP