Well logging

Formation testing

Drill stem testing (DST)

Open-hole formation testing during drilling is performed after penetrating promising intervals. Maximum possible preservation of natural porosity and permeability of drilled rocks and ensuring hydraulic communication between rocks and well are the prerequisites for obtaining reliable data. This is achieved by controlling physical and chemical parameters of drilling mud used for penetrating target formations.

Cased-hole formation testing is performed for testing (stimulating) low-producing perforated formations, draining (cleaning) of bottomhole, detecting leakages of cement plugs and casing string.

Testing is performed using multi-cycle drill pipe or tubing conveyed tool. Valve system of the tester is operated by rotation and vertical travel of the drill (tubing) string. Testing includes formation fluid sampling, continuous recording of pressure and temperature above and below packer using self-contained digital pressure gauges (DPG). After testing and pulling out equipment, DPG data is used to calculate hydrodynamic parameters of formation and evaluate quality of performed testing.

Main advantages of this technology:

Available test systems:

DST process

Wireline formation testing

Wireline formation testing is performed using AGIP-K tool. Testing is aimed at determining saturation types of reservoirs and evaluating their hydrodynamic parameters. There are two testing modes:

Production logging mode assumes multiple stimulation tests from target formations or intervals of one formation during one tool trip in order to:

Formation testing mode assumes taking one downhole fluid sample from target formation or formation interval during one tool trip in order to:

Technology advantages:

AGIP-K application conditions and specifications:

Tool schematic and recorded pressure charts during testing