Radial multi-branch drilling and temporary plugging fracturing combined well completion method and device, and application

Abstract

The invention provides a radial multi-branch drilling and temporary plugging fracturing combined well completion method and device, and application. The radial multi-branch drilling and temporary plugging fracturing combined well completion method comprises the steps that data interpretation results such as earthquakes, well logging and oil reservoir numerical simulation are comprehensively utilized, and a high-pore pressure region reservoir is determined; casing cutting window is completed, and multi-branch radial holes are drilled in the high-pore pressure region reservoir through high-pressure water jet spraying drill bits conveyed by a continuous pipe and a high-pressure hose; and the continuous pipe, the high-pressure hose and the spraying drill bits do not need to be pulled out, temporary plugging fracturing liquid containing a temporary plugging agent is pumped directly through the continuous pipe to fracture the radial holes, and pipe string radial multi-branch drilling and temporary plugging fracturing combined well completion is achieved. A high-pressure area with rich reserves directionally communicates through the multi-branch holes, fracturing cracks are induced to beinitiated, meanwhile, a temporary plugging agent material plugs the dominant cracks extending towards a low-pressure area, thus the cracks turn to the high-pressure area, effective communication and utilization of the reserves in the high-pressure area are achieved, and the unconventional oil and gas recovery rate is increased.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas exploitation, and in particular relates to a well completion method, device and application of radial multi-branch drilling combined with temporary plugging and fracturing. Background technique [0002] Unconventional oil and gas is a kind of oil and gas resources with wide distribution and large reserves, and it is an important substitute resource for conventional oil and gas. The permeability of unconventional oil and gas reservoirs is extremely low, and it is difficult to form industrial oil and gas flow by conventional extraction methods. Cluster horizontal well drilling and multi-stage fracturing completion are effective means to develop unconventional oil and gas resources at present. However, with the long-term depletion of oil and gas reservoirs, the effectiveness of fracturing is gradually reduced, and the input-output ratio continues to decline. Statistics on oil and gas pro...

AI Technical Summary

Problems solved by technology

The analysis reason is that the long-term production of old wells depletes the pressure of gas reservoirs around wells, and the fracturing fractures of new wells tend to extend toward the low pore pressure area, while the high pore pressure area with abundant reserves has not been stimulated by fracturing, resulting in the gap between old wells and new wells. Production competition further exacerbates gas reservoir depletion

All in all, the disclosed cluster horizontal well drilling and multi-stage fracturing completion methods are difficult to fully stimulate the reservoir, and the improvement of shale gas recovery is limited.

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