High-temperature oil well plugging agent

Abstract

The invention discloses a high-temperature oil well plugging agent and belongs to the technical field of petroleum drilling materials. The high-temperature oil well plugging agent is prepared from raw materials in percentage by mass as follows: 60%-85% of a cementing material, 2%-10% of phosphate, 10%-35% of an active admixture, 0-5% of a filling material and 3%-6% of a retarder; the cementing material is aluminate cement. Properties of the cementing material are selected, phosphate, the active admixture and the retarder in a specific proportion are added, so that after cement slurry reaches a leaking layer position and loses fluidity, the strength of set cement is quickly increased, plugging is realized by the aid of self strength, and the plugging agent has the characteristic of early strength, meets the requirement of plugging at 80-120 DEG C and has the advantages of good high-temperature resistance and good plugging effect.

Description

technical field [0001] The invention relates to a high temperature resistant oil well plugging agent, which belongs to the technical field of petroleum drilling materials. Background technique [0002] During the drilling process, large fractures and karst caves, also known as malignant leakages, account for a high proportion of this type of leakages. Malignant leakages are prone to occur in formations with developed fractures or karst caves, faults or broken zones, and the leakage rate is average. There are phenomena such as loss of return or circulation failure of single or double pumps and will be accompanied by leakage and spraying. For this type of leakage, cement slurry mixed with high-solid bridging materials is often used for plugging. [0003] However, with the development of the drilling industry, the depth of some vicious leakage occurs is relatively deep, and the downhole temperature is high. The general cement slurry mixed with high-solid phase bridging materia...

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Problems solved by technology

[0005] The invention aims to solve the poor high temperature resistance of the plugging agent in the prior art, especially under the high temperature conditions of deep wells and ultra-deep wells, it cannot meet the construction requirements of channeling and plugging, resulting in low plugging efficiency and even huge losses The problem is to provide a new high temperature resistant oil well plugging agent, which uses aluminate cement, phosphate and active external admixtures and other raw materials. Under a specific ratio, the plugging agent has early strength at 80-120°C characteristics, using its own strength to achieve the purpose of sealing

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