Device for simulating well cementation strength gradient layers of deepwater weakly cemented strata

Abstract

The invention provides a device for simulating well cementation strength gradient layers of deepwater weakly cemented strata. The device has the advantages that solidifying slurry in an internal space of a medium filling device is subjected to pressurization compaction by the aid of nitrogen in a nitrogen tank, the compaction pressures can be adjusted and can be optimally 7 MPa, and accordingly pressure environments of the deepwater weakly cemented strata can be realistically simulated; a gas cylinder valve and a gas cylinder pressure gauge are arranged on a pressure pipeline between the nitrogen tank and the medium filling device, the gas cylinder valve can be adjusted, and accordingly the slurry ejection pressures on the solidifying slurry can be adjusted in real time; a separable top sealing plate and a separable bottom sealing plate are arranged at two ends of an annular side wall of the medium filling device, accordingly, cylindrical stone formed by the ejected solidifying slurry can be assuredly integrally taken out of the medium filling device, the stone can be used for carrying out compressive strength tests after the surfaces of the stone are subjected to simple treatment, and the pressure-resistant capacity of the solidification strength gradient layers of the deepwater weakly cemented strata can be conveniently reflected.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a device for simulating gradient layers of cementing strength in deep-water weakly cemented formations. Background technique [0002] As my country's demand for oil and gas resources continues to increase and oil and gas production in the eastern part of the land declines, oil, gas and hydrate resources in the western and deep water areas will become important areas for the sustainable development of my country's petroleum industry. Weakly cemented strata are widely distributed in my country's deep-water shallow strata and in the western Jurassic and Cretaceous strata. The special diagenetic environment and depositional process have formed its unique geological conditions and mechanical properties. [0003] First of all, for deep-water weakly cemented strata, the temperature in the deep-water shallow layer is low, the cement hydration time is long, and the strength gro...

AI Technical Summary

Problems solved by technology

[0010] The invention provides a device for simulating gradient layers of cementing strength in deep-water weakly cemented formations, aiming to study the gradient layers of cementing strength in deep-water weakly cemented formations by means of simulation, and to select suitable curing materials and suitable Cementing construction parameters, fundamentally solve the problem of cementing quality in deep water weakly cemented formations

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