Developing Cement Mixtures to Cement Horizontal Well Intervals with Multi-Stage Fracturing

Abstract

Summary The well casing practice shows that cement stone ensuringcasing integrity can destroy under the impact of loads during performance of different process operations. Dynamic impact violates casing integrity most seriously. The potential consequences are inter-casing and behind-casing cross flows, bottom water breakthroughs into a perforation interval, premature water flooding. The currently used cementing materials based on Portland cement resist shock loads inadequately and have a low tearing strength. Many complications connected with premature water flooding directly depend on the low deformation capacity of cement stone. This work suggests methods to solve the problem of annular isolation integrity destruction on the basis of a range of studies, and namely: calculation of the required cement stone strength to prevent its destruction behind casing during perforation and fracturing operations; assessment of the currently used cementing materials to check their ability to ensure the required strength; assessment of cement stone stress via the finite elements method; graphical representation of the stress condition of cement stone by means of the Mohr theory.

Synthesis and performance application of self‐crosslinking water‐borne epoxy resin for cementing

“…With the continuous deepening of oil and gas resource exploration, the strata drilled are becoming more complex, bringing more stringent tests to the cementing quality 5,6 . Because traditional Portland cement stone is an inherently brittle material, it is easy to shrink and has poor cementation 7 . Besides, the difference in pressure of soft and hard formations, formations' temperature, and casing expansion will cause cracks in cementing cement, which will affect the effectiveness of formation isolation and further cause channeling problems.…”

Effect of Epoxy Resin Emulsion on the Mechanical Properties of Oil Well Cement‐Based Composites

“…Cementing operation is important for oil and gas well construction; its fundamental purpose is to achieve interlayer sealing, support and protect casing, preventing fluid channeling between different formations under the pressure difference [1][2][3]. Oil well cement is the main component of cementing material, but because of its brittleness after solidification, it cannot resist downhole stress damage when used directly in cementing [4].…”