Evaluating method for corrosion of well-reinforcing cement stone
A technology for cementing cement stone and corrosion evaluation, which is applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., to achieve real and reliable results.
Inactive Publication Date: 2012-12-19
SOUTHWEST PETROLEUM UNIV
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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.
Method used
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Embodiment 1
[0023] Firstly, according to the SY / T 5546-2002 "Oil Well Cement Applied Performance Test Method" standard, the G-grade cementing cement slurry was prepared.
[0024] Pour the prepared G-grade cement slurry into the mold 1 with an inner diameter of 25 mm, a length of 30 mm and a length of 50 mm, seal the mold 1 and place it in a high-temperature and high-pressure curing kettle for curing for 48 hours, so that it can solidify under simulated downhole conditions to form cement stone 2 , Then take out the cement stone sample A that has not removed the mold, and use sandpaper to grind the vitrified surface. According to this method, several cement stone samples A are made according to the test requirements.
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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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IPC IPC(8): G01N17/00
Inventor 林元华李强曾德智施太和朱红钧王其军武元鹏周莹谢娟
Owner SOUTHWEST PETROLEUM UNIV