Research on the Evolution of Temperature Field Around the Wellbore During Cement Slurry Hydration in Deep Formation
The Tarim Basin has been built into the largest ultra-deep oil and gas production base in China,and the deep environment would have a certain impact on the exothermic character of hydration cement,and it is very important to study the exothermic reaction and heat transfer characteristics of cement hydration at deep ambient temperature to clarify the evolution law of the temperature field around the well.Firstly,according to the field measurement data,the formation temperature equations of near and far wells in Tarim area were established,and according to the temperature distribution of different depths,G-grade cement hydration exothermic reaction experi-ments at different temperatures were carried out,and based on the Krstulovic-Dabic(K-D)classical hydration ki-netic reaction model,combined with the reaction characteristics of cement NG,I and D,the prediction curve of ce-ment hydration exothermic reaction at different temperatures was derived.Furthermore,the casing-cement sheath-formation heat conduction model is derived,and the exothermic reaction curve is substituted into the finite element model as the heat source,and the temperature field changes of casing and cement under the combined action of hydration exothermic reaction and high temperature formation of different well depths are obtained.The research results provide preliminary data support for analyzing the impact of local finite space temperature field changes on formation pressure and casing deformation characteristics in the next step.
Tarim oil fieldcement hydration exothermic reactioncasing-exothermic reaction-formation heat transfer modeltemperature field around the wellbore
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