# Well logging

## Open-hole logging

Objectives:

- Lithological and stratigraphic breakdown of well logs;
- Characterization of reservoirs;
- Quantitative estimation of reservoir properties;
- Evaluation of fluid content of reservoirs;
- Defining GOC, WOC depths;
- Drilling monitoring and defining spatial location of wellbore.

Application of open-hole (sidetrack) logging tools:

- Conventional wireline: vertical and deviated wells;
- Stiff wireline (coiled tubing): deviated and horizontal wells;
- Drill pipes: deviated and horizontal wells.

**Well logging equipment**

Cooperation with leading manufacturers of logging tools:

AO NPF “Geofizika”; OOO KarSar”, OOO “Neftegazgeofizika”, OOO NPF “AMK-Horizont”, OOO “Geoprom”, OOO “TNG-Universal”, OOO “PKF “Geotech”, OOO “PPL “SAF”, OOO Firm “NIID-50”, etc.

**Use of combination toolstrings to minimize number of logging runs:**

KarSar complex – wireline logging combination toolstring: laterolog, SP, resistivity, sonic, gamma-ray, neutron gamma, thermal neutron (CNL/TNPH), RHOB, spectral gamma ray, borehole caliper, induction, borehole deviation, microlaterolog

**AKS NAUTILUS is the self-contained cable system for wireline or pipe-conveyed logging:** laterolog, SP, resistivity, fullwave sonic, gamma-ray, neutron gamma, thermal neutron (CNL/TNPH), RHOB, spectral gamma ray, borehole caliper, induction, borehole deviation, microlaterolog

**Self-contained combination toolstrings for pipe-conveyed well logging and well works:**

AMK Horizon (laterolog, SP, resistivity, sonic, gamma-ray, neutron gamma, thermal neutron (CNL/TNPH), RHOB, spectral gamma ray, borehole caliper, high-frequency induction);

KASKAD-A-90 (laterolog, SP, resistivity, sonic, gamma-ray, neutron gamma, thermal neutron (CNL/TNPH), RHOB, spectral gamma ray, borehole caliper, high-frequency induction).

**Well log examples:**

Wireline logging. KarSar complex.

Pipe-conveyed logging KASKAD-A-90