Pressure bearing and leakage blocking agent

Abstract

The invention discloses a pressure bearing and leakage blocking agent, which solves the problems of difficult retention, easy mixing, poor caking property and pollution of a drilling fluid of the routine leakage blocking agents. The pressure bearing and leakage blocking agent comprises the following components: an amorphous form aluminosilicate curing agent, an activator, a retarder and an inertia filling material; a ratio of components is calculated according to a following mode: modulus is 1.0-1.4, the activator with mass concentration being 10-20% is taken as a liquid phase, a mass ratio (water cement ratio) of the liquid phase to the curing agent is 0.8-1.2; the addition of the retarder accounts for 0-1% of total amount of the above slurry. The pressure bearing and leakage blocking agent has the advantages of adjustable solidification time, high solidification intensity, large bearing, is not restricted by a leakage channel, so that effective plugging is formed to a leakage layer.

Description

technical field [0001] The invention relates to a plugging agent for petroleum drilling, in particular to a solidified pressure-bearing plugging agent. Background technique [0002] The leakage problem of drilling working fluid is more common in the drilling process, especially with the continuous deepening of oilfield exploration and development, the malignant leakage problems such as deep fractures and karst caves need to be solved urgently. Leakage agents and slag-based plugging agents have problems such as poor environmental adaptability and high temperature failure. [0003] During the application of the composite plugging agent, it is necessary to accurately predict the shape and size of the leaking layer in order to optimize the particle size of the plugging agent. However, during the construction process, it is difficult for technicians to judge the real situation downhole. The success rate is greatly reduced. [0004] Cement plugging has the advantages of fast spe...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a curable pressure-bearing plugging agent for oil field drilling. The plugging agent has a simple preparation process, has the characteristics of low-temperature cementation and high-temperature curing, is easy to reside in the leakage channel, and has high curing strength, which can improve The pressure bearing capacity of the fractured formation can effectively seal the leaky layer, and overcome the shortcomings of conventional plugging agents such as difficulty in staying, easy to channel and mix, poor cohesiveness, and polluted drilling fluid

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