Well cementation cement sheath performance simulation experiment device and experiment method

Abstract

The invention relates to a well cementation cement sheath performance simulation experiment device and an experiment method. The experiment device comprises one set of cement cake circulation device, one set of cement sheath performance detection device and one set of cementing face shearing force experiment device. The experiment method comprises the following steps of: simulating the manufacture process of a well cementation test sample under the practical underground warm-pressing condition; detecting the sealing performance and the corrosion resistance of the cement ring; detecting the sealing performance and the corrosion performance of the cement ring; and detecting cementing face shearing force between a casing pipe test sample and the cement sheath and cementing face shearing force between the cement sheath and a stratum test sample. According to the invention, because the adopted casing pipe test sample has the same size and the material with the casing pipe material applied in the practical well cementation, the adopted stratum test sample is a standard artificial stratum test sample, the porosity-permeability characteristic, the strength characteristic, and the fluid characteristic and the like of the adopted stratum test sample are same with the stratum characteristic in the practical well, the invention can be used for truly simulating the dynamic variation of full-size well cementation, and the simulation condition is accurate. The invention can be widely applied in simulation experiments of various well-cementation dynamic variations.

Description

technical field [0001] The invention relates to a simulation experiment device and an experiment method, in particular to a cementing cement sheath performance simulation experiment device and an experiment method capable of simulating dynamic changes in cementing under the actual temperature and pressure conditions of an oil / gas well. Background technique [0002] At present, in the process of cement bonding and cementing, the thickness of the drilling fluid mud cake and the formation process have a great influence on the bonding strength of the cement sheath. The replacement efficiency of the well flushing process is not very good. Therefore, in order to simulate the dynamic change of downhole drilling and well flushing, study the change of cement sheath bonding strength after cementing under different conditions, and improve the effect of cement bonding and cementing, there are currently many domestic An experimental device for simulating the drilling and cementing proces...

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Problems solved by technology

[0002] At present, in the process of cement bonding and cementing, the thickness of the drilling fluid mud cake and the formation process have a great influence on the bonding strength of the cement sheath. The replacement efficiency of the well flushing process is not very good. Therefore, in order to simulate the dynamic change of downhole drilling and well flushing, study the change of cement sheath bonding strength after cementing under different conditions, and improve the effect of cement bonding and cementing, there are currently many domestic Experimental device for simulating drilling and cementing process

However, since the bonding strength of the cement annulus also depends on the height of the cement slurry and the diameter of the cement annulus, the actual size of the annulus and the proportionally reduced annulus have different effects on the cementation strength. At present, the same type of experimental equipment in China is not perfect, or The porosity and permeability characteristics of the actual reservoir on site cannot be fully simulated, or the actual size of the casing and cement sheath cannot be simulated, or the formation process and thickness of the mud cake, and the well cleaning process after the formation of the mud cake cannot be truly simulated. Influence of cemented surface strength

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