High temperature plugging and regulating equipment and high temperature blocking and regulating method for steam flooding in super heavy oil reservoirs

Abstract

The present invention provides a high-temperature blocking and adjusting device and a high-temperature blocking and adjusting method for steam flooding of super-heavy oil reservoirs. The high-temperature blocking and adjusting equipment for steam driving of super-heavy oil reservoirs includes injection equipment, thermal recovery steam injection wellhead, nitrogen injection equipment and Steam injection equipment, the injection equipment is connected to the thermal recovery steam injection wellhead to inject gel solution or foam agent solution, the nitrogen injection equipment is connected to the thermal recovery steam injection wellhead for generating and injecting high-purity nitrogen, the The steam injection equipment is connected to the thermal recovery steam injection wellhead for generating and injecting high dryness steam. The high-temperature plug-in and control equipment and high-temperature plug-in and control method of steam flooding in this super-heavy oil reservoir use a combination of gel and nitrogen foam, which can significantly reduce the comprehensive water content of the steam-flooding well group and increase the oil-steam ratio, and greatly increase the super-heavy oil production rate. High temperature blocking effect, saving blocking cost.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a high-temperature blocking and regulating device and a high-temperature blocking and regulating method for steam flooding of super-heavy oil reservoirs. Background technique [0002] Super heavy oil reservoirs refer to heavy oil reservoirs with degassed crude oil viscosity greater than 50000mPa.s under formation temperature conditions. Due to the high viscosity of crude oil, it is difficult for crude oil to flow under the original formation conditions, so the development method of thermal recovery must be adopted. [0003] Steam injection is currently the most important thermal recovery method for heavy oil, mainly including steam huff and puff and steam flooding. For ultra-heavy oil reservoirs, steam flooding can generally increase the recovery rate by about 15% on the basis of steam huff and puff, and the overall recovery rate can reach about 25%-45%. [0004]...

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Problems solved by technology

[0006] In the high-temperature plugging and adjustment method for steam flooding of ultra-heavy oil reservoirs, solid phase particles and thermosetting resins are widely used due to their high plugging strength and good temperature resistance, but neither of them has selectivity and is likely to cause The oil layer is permanently polluted, the requirements for construction technology and reservoir cognition are too high, and the engineering risk is relatively high

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