Evaluating method for corrosion of well-reinforcing cement stone

Abstract

The invention provides an evaluating method for corrosion of well-reinforcing cement stone, which comprises the following steps: firstly, preparing cement paste for reinforcing a well; filling the prepared cement paste into a mould; sealing the mould, placing into a high-temperature high-pressure curing kettle and curing for a period of time, thereby solidifying the cement paste and forming the cement stone; placing a cement stone sample with the mould into a corrosion reaction kettle, pouring into a corrosive medium, and controlling the conditions of temperature, pressure and corrosion time, thereby carrying out a corrosion test; and finally, taking the cement stone sample out of the corrosion reaction kettle, removing the mould, performing electron microscope scanning on the cement stone, measuring the performance parameters, such as compression strength and permeability, of the cement stone, and analyzing and evaluating a corroded cement stone structure. According to the evaluating method provided by the invention, the dynamic corrosion condition of the well-reinforcing cement stone being in one-way contact with the corrosive medium in the well is truly simulated, and a measured result is true and reliable.

Description

technical field [0001] The invention relates to a method for evaluating the corrosion of oil and gas well cementing cement stones, in particular to a method for high H content 2 S and CO 2 Corrosion evaluation method of cement cement in sour oil and gas fields. Background technique [0002] Exploitation of oil and gas resources requires drilling the strata and establishing oil and gas passages from the ground to the reservoir. In the process of drilling the formation, in order to stabilize the well wall and seal the formation fluid, it is necessary to inject cement slurry into the gap between the casing and the formation to form cement stone to protect the wellbore and make the drilling work go smoothly . Since the formation contains a large amount of corrosive media, the corrosion of cement stone is a common problem, especially in the high H2 2 S and CO 2 During the development of sour oil and gas fields, the corrosion of cement stone is very serious, which seriously t...

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Problems solved by technology

Therefore, the corrosion evaluation of cement stone by the above method is not consistent with the corrosion situation of cement stone in the real underground environment.

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