Studying the Technical Condition of Wellbores

Casing Cementing Control

The cementing process is controlled by registering the main parameters of the cementing process in wells. Using a set of process sensors and a cementing control station “MEGATAMPONAGE”, the following parameters are measured:

• supply pressure;
• density of the injected solution;
• temperature of the injected solution;
• solution flow rate;
• flow rate for injection cycles;
• total volume of injected solution.

Documentation of the cementation process with the provision of diagram material allows the services of drilling and mining enterprises to carry out a full analysis of the quality of the work performed.

Downhole Acoustic TV

In open trunks by CAT are determined:

• the intervals of the collapse of the walls of the well,
• rock cavernosity intervals,
• single caverns
• single cracks
• formation dip angle

In studies in columns, the following tasks are solved:

• determination of the position and nature of pipe defects (wrinkles, tears, large clearances of coupling joints),
• the presence, position and nature of perforations.

Casing Cementing Quality Control

Studies on the quality control of cementing casing strings of all diameters are carried out by gamma-gamma cementometry (GHC), electromagnetic defectoscopy and acoustic cementometry (ACC). Well research is carried out using the equipment SGDT-100, TsM, MAK-2, MAK-3, MAK-9, CAT, EMDST.

Tasks to be solved:

• assessment of the spatial orientation and size of defects (channels, micro-gaps, discontinuities) in the cement ring;
• determination of the selective and integral density of the annular substance;
• assessment of casing eccentricity, cement lift, type of cement;
• study of the distribution of matter in the annulus by density sweep;
• assessment of the nature of the contact of cement with the column and rock;
• the study of the technical condition of the column (gaps, cracks, corrosion areas, location of centering lights, etc.).

Electromagnetic defectoscopy, gamma - gamma defectometry and tube profilometry

Tasks to be solved:

• distribution of the presence, sizes of well support elements (centralizers, couplings, nozzles, turbulators), and their compliance with the design;
• casing thickness;
• profiles, minimum and average section of pipes;
• locations of perforation intervals.