High temperature high pressure oil well cement paste coagulation instrument and its coagulation time measuring method

Abstract

The invention is a method which surveys the coagulation status and its relevant time of annular cement under high pressure and high temperature, while simulating different depths and static conditions. It is adaptive to activities such as petroleum well and gas well reinforcement, squeezing cement, pouring cement seal and leakage repairing. The invention provides with the ability of surveying starting and ending time of different coagulation periods, in cement liquor under high temperature and high pressure, by surveying the variation of heat released by cement hydrating. First pre-heat the kettle to a experiment temperature, then put in it with a cup filled with prepared cement liquor in a reactor, seal reactor and increase the pressure to experiment value after the temperature is stable both outside and inside; initiate data processing system so to record the temperature variation automatically with a computer; finally figure out the coagulation starting and ending time by time-temperature curve line. The problem that surveying is difficult under high temperature and high pressure, is resolved with the invention which is adopted with the indirect contacting continuous survey of temperature variation.

Description

Technical field: [0001] The invention relates to a method that can better simulate different well depths and static conditions, and measure the coagulation state and corresponding time of annular cement slurry in a high-temperature and high-pressure environment. It is suitable for oil and natural gas cementing, cement extrusion, and injection Cement plug and plugging, etc. Background technique: [0002] In oil and natural gas exploration and drilling, after drilling thousands of meters deep, consolidation and isolation of the well wall to prevent rock collapse in the well is a key technical issue to increase the life of oil and gas wells and improve the production capacity of oil and gas wells. The technical terms of consolidation and isolation of the well wall are collectively referred to as cementing engineering. The cementing project is to put the casing into the well, and then pump the oil well cement slurry into the inner hole of the casing to replace it between the we...

AI Technical Summary

Problems solved by technology

[0003] At present, the different coagulation states and initial and final coagulation times of oil well cement slurry can only be measured under normal pressure and general temperature curing. The initial and final setting time of mud, but because of the harsh environment, the mechanical measurement is not ideal, so it is no longer used

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