RESEARCH AND DEVELOPMENT OF CEMENTS WITH DIFFERENTIAL PROPERTIES FOR COMPLETING GAS WELLS

Kabdushev A.A. Agzamov F.A. Manapbayev B.Z. Delikesheva D.N. Korgasbekov D.R.
2023 National Academy of Sciences of the Republic of Kazakhstan

News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023 #4 Issue 460 97 - 108 pp.

The study of problems arising during well cementing can point out two main problems, which appear before and after well cementing. These are gas infiltration during the waiting on cement (WOC); and violation of annular space tightness under dynamic loads. The later is the consequence of gas breakthrough. Gas permeation is caused by a decrease in pressure in the annulus because of cement slurry structuring, which is evident during the transitional period of cement slurry curing. It should be noted that gas does not penetrate into the borehole if the mortar is in the liquid state, but gas also cannot actively enter after the mortar has turned to stone. Since the temperature in the well bottom hole zone is always higher than at the wellhead, the hardening of the cement slurry proceeds from the bottom up. In this case, the hardening slurry itself provides staged gas transfer from the bottom hole to the wellhead. In this aspect may be of interest the method of well curing, when the cement slurry in the borehole hardens from the top downward. The given analysis of the field material on the fields of the Republic of Kazakhstan has shown that improving the quality of cementing can be achieved by using cement slurries with differential properties. Instruments and equipment corresponding to API and GOST 1581-96 standards were used for conducting researches. The given results of experimental studies allowed obtaining cement slurries for four portions of cement slurries, consistently pumped into annular space, with setting time of 3 hours 20 minutes. Optimal setting time of the second, third and fourth portions of cement slurry was 5–30, 7–20 and 9–40 hours, respectively. All justified formulations of grouts ensured obtaining of stone meeting the requirements of the standards.

cement stone , fiberglass , grouting slurry , reinforcement , wellbore stabilization

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Taraz Regional University named after M.Kh., Dulaty, Kazakhstan
Ufa State Petroleum Technical University, Russian Federation
Satbayev University, Kazakhstan

Taraz Regional University named after M.Kh.
Ufa State Petroleum Technical University
Satbayev University

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