Heavy oil thermal recovery steam injection device and heavy oil thermal recovery method

Abstract

The invention relates to a heavy oil thermal recovery steam injection device and a heavy oil thermal recovery method. The heavy oil thermal recovery steam injection device comprises an inner steam injection pipe and an outer steam injection pipe which is provided with a gas outlet and arranged outside the inner steam injection pipe in a sleeving mode. The two ends of the outer steam injection pipe are in seal connection with the outer surface of the inner steam injection pipe. A plurality of packers are arranged between the inner steam injection pipe and the outer steam injection pipe at intervals to divide a space between the inner steam injection pipe and the outer steam injection pipe into a plurality of noncommunicating steam injection sections. Pressure valves with different opening pressures are arranged in the zones, located in all the steam injection sections, of the inner steam injection pipe correspondingly. By using the heavy oil thermal recovery steam injection device, a horizontal shaft can be heated evenly, and the recovery efficiency of heavy oil is improved.

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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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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