Horizontal well profile control method and device

Abstract

The invention discloses a horizontal well profile control method and device. A horizontal well comprises a vertical well section and a horizontal section, wherein the vertical well section is internally provided with a casing and an oil pipe, and an oil jacket annular space is formed between the casing and the oil pipe. The horizontal section is located in an oil layer and is completed by a screenpipe. The method comprises the steps that a predetermined amount of nitrogen foam gel plugging agent is injected into the horizontal well; construction pressure is acquired, and when the constructionpressure reaches a predetermined range, the gel plugging agent with the temperature resistance higher than that at a maximum temperature of injected steam is injected into the horizontal well; a displacement slug is injected into the horizontal well, and the plugging agent in the vertical well section is replaced into an oil layer communicating with the horizontal section. The horizontal well profile control method and device can perform profile control of a super heavy oil horizontal well of high and medium cycle throughput, and reduces the degree of inconsistency of use and reduces the formation of steam channeling channels as much as possible.

Description

technical field [0001] The invention relates to the technical field of profile control and flood control, in particular to a horizontal well profile control method and device. Background technique [0002] At present, as the scale of deployment of horizontal wells increases, the contribution rate to the stable production of Shuguang Oilfield is also increasing. However, with the deepening of horizontal well development, the uneven production of horizontal sections has gradually become prominent, which seriously limits the productivity of horizontal wells. Statistics show that the high producing section of a horizontal well only accounts for 39% of the length of the horizontal section. Taking horizontal wells in Du 84 Xinglongtai block as an example, the well-produced horizontal section accounts for only 26% of the total well section. Uneven production leads to local burst of injected steam, which seriously affects the development effect of horizontal wells, and may even lea...

AI Technical Summary

Problems solved by technology

The above-mentioned profile control methods are effective for low-to-medium-period ultra-heavy oil horizontal wells, but with the intensification of production unevenness and the formation of steam channeling channels, the effect gradually becomes worse

Specifically, the profile control strength of nitrogen foam and nitrogen foam gel is relatively low, and they have a weak plugging effect on ultra-heavy oil horizontal wells with medium and high period huff and puff, and they will quickly fail under the flushing of subsequent steam injection, making it difficult to exert an ideal profile control effect

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