Method for measuring displacement efficiency of cement slurry by using temperature sensing device

Abstract

The invention relates to a method for measuring displacement efficiency by using a temperature sensing device in a simulation experiment on the displacement efficiency of cement slurry in the field of petroleum engineering. The method sequentially comprises the following steps of: (1) forming 4 holes on the surface of a shaft at a measuring section in four directions for arranging temperature sensors respectively; (2) preparing mud and cement slurry with water of different temperatures; (3) adjusting eccentricity of an inner tube of the shaft in an outer tube of the shaft; (4) circulating with the mud to fill the annular space between a bushing and the shaft with the mud; (5) performing displacement with the cement slurry; (6) transmitting data to a computer by a data acquisition card anddrawing four T-S curves by the computer according to temperature variation of each temperature sensor; and (7) analyzing the displacement efficiencies of the cement slurry at different positions by comparing the different T-S curves. By displacing the temperature of the mud with that of the cement slurry in a most intuitive way, the displacement efficiency of the cement slurry can be analyzed on the computer and time and labor are saved.

Description

Technical field [0001] The invention relates to a method for measuring the displacement efficiency by using a temperature sensing device in a cement slurry displacement efficiency simulation experiment in the field of petroleum engineering. Background technique [0002] At present, in the cement slurry displacement efficiency simulation experiment of domestic and foreign petroleum engineering, the more traditional laser speed measurement and coagulation measurement methods are used. However, the current general methods obviously have shortcomings: the laser speed measurement method can measure the displacement efficiency of cement slurry, but In this way, only the similar liquid of cement slurry and mud can be used, and it is difficult to realize the situation of replacing the mud with cement slurry in the real environment; the setting measurement method needs to wait for the cement slurry to replace the entire shaft by dissecting the entire shaft, and then according to the cement...

AI Technical Summary

Problems solved by technology

[0002] At present, in domestic and foreign petroleum engineering cement slurry displacement efficiency simulation experiments, relatively traditional laser velocimetry and waiting coagulation measurement methods are used, but the current general method has obvious shortcomings: laser velocimetry can measure the displacement efficiency of cement slurry, but In this way, only the similar liquid of cement slurry and mud can be used, and it is difficult to realize the situation of cement slurry replacing mud in the real environment; the waiting coagulation measurement method needs to wait for the cement slurry to be replaced by cutting the entire wellbore, and then according to the cement slurry To visually analyze the displacing effect of cement slurry based on the distribution of waiting solidification, although such results are intuitive and effective and use real mud and cement slurry for the test, but the operation is complicated and it is not suitable for a large number of experiments in the laboratory for a long time

Moreover, none of the current experimental methods can obtain analysis data in real time, and cannot conduct on-site real-time observations based on real-time data.

Images