Cement-formation interface maintenance and cementation quality evaluation device and method under formation water disturbance

Abstract

The invention discloses a cement-formation interface maintenance and cementation quality evaluation device and method under formation water disturbance. The device comprises a kettle body, an injection pump, an annular pressure pump, a pressure pump and a heating control device, wherein a rubber jacket and a ring-shaped rock core are arranged inside the kettle body, an upper sealing head and a lower sealing head seal the two ends of the kettle body, a leather bag is fixed in the internal cylinder of the upper sealing head and used for simulating pressure of the upper part of cement paste, a shallow groove is formed in the center of the lower sealing head, a gasket is arranged in the lower sealing head, a water inlet and a water outlet are formed in the side surface of the kettle body, formation water enters the rock core through the water inlet by virtue of the injection pump and flows out by virtue of the water outlet, and flowing of the formation water in the ring-shaped rock core isrealized. The device disclosed by the invention can simulate an underground high temperature environment, an annular mud cake is formed on the inner wall of the ring-shaped rock core, interference and destruction of disturbance of the formation water in a high water-cut period during later period of oil field water flooding development are studied, influence of annular pressure difference on cement-formation interface cementation quality also can be studied, and shear strength and hydraulic cementation strength of a cement-formation interface can be determined accurately.

Description

technical field [0001] The invention relates to a device and method for cementing two-interface maintenance and cementation quality evaluation, in particular to a device and method for cementing two-interface maintenance and cementation quality evaluation under simulated formation water disturbance conditions when adjustment wells are cemented in high water content blocks. It belongs to the field of oil and gas well engineering cementing. Background technique [0002] In the drilling and completion engineering, the cementing surface between the cement sheath and the formation is usually called the cementing second interface. The cementing quality is an important factor affecting the quality of the cementing, and will directly affect whether the oil and gas wells can be delivered smoothly. Late yield and longevity. At present, there are few studies on the influence of formation fluid on the cementing quality of the cementing interface, and most of them do not consider the dy...

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Problems solved by technology

Usually most oil and gas well cements can meet the consolidation strength required to support the weight of the casing, but the hydraulic cement strength often cannot meet the needs of the project, and the influencing factors are very complicated

Gu Jun (Gu Jun, Yang Weihua, Qin Wenzheng, Zhang Yuguang, Gao Yutang. Research on the Evaluation Method of Cementing Second Interface Isolation Capability [J]. Acta Petroleum Sinica, 2008, (03): 451-454.), Guo Xiaoyang (Guo Xiaoyang, Zhang Kai, Li Zaoyuan, et al. High temperature and high pressure cementing first and second interface sealability testing device and method: CNIO440691OA[P], 2015.) and others respectively designed related methods to measure the hydraulic bond strength of the second cementing interface, but only Conventional static maintenance, unable to maintain and evaluate the cementing interface under the condition of formation water disturbance

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