A steam channeling plugging method for heavy oil thermal recovery horizontal wells

Abstract

The invention discloses a steam channeling plugging method for a horizontal well in thermal recovery of heavy oil, which comprises the following steps: (1) lowering a steam injection pipe string into the oil layer, adopting a general injection method, and injecting steam to preheat the formation; (2) injecting steam into the formation; High-viscosity jelly; (3) Inject silicon salt high-temperature plugging agent; (4) Repeat steps (2) and (3) until the injection pressure requirement of construction design is reached; (5) Inject steam to heat the plugging agent, and shut down the well ~5d; (6) steam injection huff and puff mining. The method of the present invention realizes the integrated pipe string of plugging, steam injection and mining, with simple construction technology and low operating cost; the alternate injection of high and low viscosity systems finally forms a process method of high residence and strong plugging, which is effective Solve the problem of low-viscosity heat-resistant plugging system channeling in the formation, improve the retention of the plugging agent, expand the plugging volume of the temperature-resistant plugging agent, effectively block the steam channeling of steam injection, and thus expand the capacity of steam injection The heating range improves the development effect of heavy oil thermal recovery horizontal wells.

Description

technical field [0001] The invention relates to a steam channeling plugging method for a horizontal well in heavy oil thermal recovery, and belongs to the technical field of heavy oil reservoir recovery. Background technique [0002] Chunfeng Oilfield was put into development in 2010, with a producing area of ​​30.66Km 2 , the producing geological reserves are 44.72 million tons, and the reservoir temperature is 28°C. The viscosity of degassed crude oil at this temperature is 50,000-90,000 mPa·s. It is mainly developed by steam stimulation technology. By the end of 2015, the cumulative oil production was 3.145 million tons. After the development of steam injection huff and puff, due to the strong heterogeneity of the reservoir and the high viscosity of crude oil, the injection of steam will cause serious thermal interference and steam channeling, mainly manifested in complex steam channeling such as interwell channeling, well row channeling, and well interchanneling Phenome...

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Problems solved by technology

In the prior art, high-temperature-resistant plugging agents have stable performance at high temperatures, but it is difficult to form gels at a reservoir temperature of 28°C in this oilfield; while plugging agents that can be gelled at low temperatures are not resistant to high temperatures, and water plugging in this block not applicable

The high-temperature resistant plugging agent has low viscosity and good fluidity. It is easy to be pushed into the deep formation when steam is injected, and cannot effectively stay at the target position of channel sealing, resulting in that the construction process cannot be completed according to the design requirements, and the channel sealing effect of the plugging agent cannot be maximized.

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