Abstract
The efficient development of oil and gas resources is inseparable from the progress of drilling technology and the safety of the long life cycle of wellbore. At present, exploration and development is expanding to deep and ultra-deep areas. The long life cycle safety of deep and ultra-deep wells is mainly realized by the sealing performance of cement slurry. Additionally, the accumulation degree of cement slurry particles is closely related to sealing performance. Based on fractal theory, an accumulation model of continuous distribution of additive material particles was designed, which can determine the range of fractal dimension necessary to realize the tight stacking and guide the proportion of solid admixture. The formulation of high temperature-resistant cement slurry was prepared by designing the ratio of solid admixture and optimizing the high temperature-resistant liquid admixture. The evaluation of engineering and temperature resistance of the cement slurry proves the rationality of the accumulation model, which can be applied to the design of a high temperature cementing slurry system in deep and ultra-deep wells.
Highlights
With the depletion of conventional shallow resources, oil-gas exploration and development is gradually expanding to complex environments such as unconventional resources, deep land and deep water [1,2,3,4]
If the cement slurry system is not carefully designed, the strength of cement stone will decline at a high temperature
Cement slurry was prepared according to the API RP 10B Recommended Practice for Testing Well Cements of the American Petroleum Institute, in which the dosage of the admixture is calculated as its percentage in the mass of dry cement [47]
Summary
With the depletion of conventional shallow resources, oil-gas exploration and development is gradually expanding to complex environments such as unconventional resources, deep land and deep water [1,2,3,4]. More than 40% of the world’s remaining oil and gas resources are distributed in deep formations below 5000 m. The static temperature of deep wells at the bottom hole can reach more than 200 ◦ C, and the pressure bottom hole can reach more than 100 MPa [5]. With their high temperature and high pressure, underground operations pose a significant challenge to the performance design of a high-temperature well cementing slurry. If the cement slurry system is not carefully designed, the strength of cement stone will decline at a high temperature
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