Cement paste system choosing method capable of preventing oil, gas and water from channeling

Abstract

The invention relates to a cement paste system capable of preventing oil, gas and water from channeling, in particular to a cement paste system choosing method capable of preventing oil, gas and water from channeling. The cement paste system choosing method is characterized in that (1) aiming layers with short oil layer sealing sections and shallow oil pool burial depth can choose a rapid hardening cement formula; (2) aiming layers with complex stratums, abnormal interlayer pressure and active stratum fluid can choose a water loss reduction coagulation promoting formula, water loss reduction expansion cement paste formula, a right angle densification performance formula, or a water loss reduction expansion early strength cement paste formula; (3) aiming layers with large oil layer span, long sealing sections and abnormal interlayer pressure can choose three coagulation cement paste system according to pressure stabilization principle. The cement paste system choosing method can prevent pressure leakage stratums and guarantee fluid of pressure stabilization stratums.

Description

technical field [0001] The invention relates to a cement slurry system for oil field cementing to prevent oil and gas water channeling, in particular to a method for selecting a cement slurry system for preventing oil and gas water channeling. Background technique [0002] With the development of Changqing Oilfield, in order to further tap the potential of the oilfield, improve the development effect and recovery rate, adjustment work must be carried out, and the wells drilled for oilfield adjustment are adjustment wells. Compared with the basic well pattern in which the oil and gas layers were in the original state in the early stage of oilfield development, adjustment wells have many problems such as complex downhole pressure system and mutual influence of adjacent wells, and the cementing quality is not easy to guarantee. In recent years, more and more wells have been adjusted and updated in the Changqing area, and the difficulty of cementing has become more and more diff...

AI Technical Summary

Problems solved by technology

③The burial depth of the oil reservoir is relatively shallow, affected by temperature and pressure, the cement slurry solidifies for a long time, and the probability of water channeling is high

What's more serious is that during the drilling and cementing operations, the adjacent wells in the same well site did not stop injecting and producing, and the construction party refused to accept our request to stop injecting, which artificially caused the pressure balance relationship between the various formations Changes occur, interlayer pressures are different, intralayer pressure is unbalanced, and a multi-pressure system is formed in the vertical and horizontal sections. The well is difficult, and oil-water channeling is very easy to occur during the cementing process, which seriously affects the cementation quality of the cement slurry in the oil zone.

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