Coagulated cake forming agent and its preparing process and usage

Abstract

The invention discloses cake agglomeration forming agent, a preparation method and use thereof. NaOH, Na2SO4 and Na2SIO3.9H2O are dissolved into the water to mix and produce the cake agglomeration forming agent; in the cake agglomeration forming agent, NaOH is between 1 and 3 percent, Na2SO4 is between 0.5 to 1.5 percent, the Na2SIO3.9H2O is between 2 and 4 percent, and the remainder is water (the above proportion is mass percentage). The produced cake agglomeration forming agent is taken as petroleum well cementing pad fluid, and the bonding strength of two interfaces of well cementing can be improved through complicated interfacial physical and chemical reactions (mainly an ion reaction which forms new cement) with corresponding substances in a modified drilling fluid mud cake. The invention realizes a non-MTC method to improve the bonding strength of the two interfaces of well cementing and can avoid the problems of brittleness and high temperature performance variation and so on of the MTC condensate, thereby contributing to the improvement of the bonding quality of the two interfaces of well cementing and settling a solid foundation for the exploitation of petroleum natural gas.

Description

technical field [0001] The invention relates to a condensate cake forming agent and a preparation method and application thereof, which belong to the field of petroleum engineering and also belong to coal bed gas engineering. Background technique [0002] At present, the known and common methods for solving the problem of cementing two interfaces include the following two types: [0003] The first category is commonly used physical or mechanical methods, namely turbulent displacement, wall shearing, movable casing, mud scraper, expansion extrusion, fiber toughening and other cementing techniques. The emergence of these methods is undoubtedly very beneficial to oil and gas well annulus isolation, but in view of the complexity of the cementing interface and the limitations of field construction conditions, the effects they can achieve are relatively limited. [0004] The second type is the special MTC method, which solves the compatibility problem between drilling fluid and ...

AI Technical Summary

Problems solved by technology

However, inherent problems such as brittle fracture of MTC solidified body and high-temperature performance variation may lead to more serious interlayer crossover due to operations such as perforation, affecting oil and gas production effects and even scrapping wells, which seriously restricts MTC to a certain extent. Comprehensive application effect and popularization of technology