4D admixture for well cementation

Abstract

Disclosed is a 4D admixture for well cementation. The 4D admixture for well cementation is characterized in that (1) the 4D admixture for well cementation is prepared from 70% of special low-density materials (floating beads and pulverized fuel ash), 10% of stabilizer (micro-silicon), 10% of reinforcing agent (slag) and 10% of modifier (CaO); (2) the 4D admixture for well cementation and cement can be well mixed to form a system, and the temperature resistance, acid resistance and corrosion resistance performance of the formed system can well meet various requirements of well cementation; (3)the 4D admixture for well cementation and the well cementation cement are mixed according to a certain ratio to form the new cement slurry system, the system is stable and is applied to low-pressure wells where seepage and leakage occur easily, and prepared cement slurry has the advantages of channeling prevention, high toughness and the like; (4) through the application of the 4D admixture for well cementation, on the basis of ensuring well cementation quality, the use quantity of various well cementation admixtures and the well cementation cost can be reduced.

Description

technical field [0001] The 4D external admixture for cementing can be used for low pressure and easy leakage cementing. It has the advantages of low pressure, low permeability, low density and low cost. Effectively prevent leakage and seepage, improve the quality of cementing and reduce the cost of cementing. Background technique [0002] With the continuous development of various blocks, downhole injection and production are unbalanced, resulting in downhole pressure disorder and local pressure imbalance. During drilling and cementing, lost circulation, seepage, oil and water channeling, and even malignant lost circulation and overflow often occur Accidents such as drilling and cementing not only increased the difficulty, but also increased the cost. [0003] In order to increase exploration reserves, improve single well productivity, and effectively develop oil and gas resources, cementing puts forward higher requirements for cement slurry systems. However, with the redu...

AI Technical Summary

Problems solved by technology

However, with the reduction of cementing costs and the rise in the price of cementing materials, it is difficult to solve the problem of materials with low prices and good performance required for cementing.

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