ESTIMATION METHOD OF THE QUALITY OF WELL CEMENTING IN LOW-TEMPERATURE ROCKS Russian patent published in 2018 - IPC E21B47/05 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the gas and oil industry and can be used in the development of northern hydrocarbon reservoirs, in particular when controlling the thermal insulating capacity of a thermal insulated column (TIC) and assessing the quality of wells cementing drilled in areas of low-temperature rocks (LP). Quality of the well cementing in the LP, equipped with TIC, is determined by isolating the different sections h_i, where i = [1…n] is the number of the site to be examined, taking into account the stability of the rocks, and / or their cavern porosity, and / or absorbing capacity. Before the injection of cement at the wellhead, temperature surveys are carried out, including the measurement of the temperatures of the selected equal volumes of samples of the displacement fluid, water and their mixtures. Taking into account the estimation of the specific heat release limit of the cement used at the well in a casing string annulus and the specific limit total heat quantity, which releases 1 kg of a cementing slurry when filling the entire annular space during cementation during hydration in the cement sheath, determine the index of the cementing quality factor K_qf.

EFFECT: expansion of functionality, consisting in using a heat-insulated casing column at an optimum depth; increase in the quality of fastening and sealing ability of the cemented wellbore, as well as the thermal insulating capacity of the direction used at the well.

1 cl, 1 dwg