Geosteering

Our company provides geosteering services or geological support for drilling horizontal wells and sidetracks. Our geosteering team provides excellent, industry-leading service. Typically, our service includes landing the transport section in the target formation and navigating the horizontal section inside the target interval.

We have extensive experience gained from successfully completing hundreds of geosteering jobs, with more than 150 jobs completed using in our proprietary software, Geosteering Office. Our company's main priority is giving personal attention to each customer that leads to the safe and successful completion of our services. We provide service at an industry-leading level. Our services are performed using our own software, Geosteering Office.

What is geosteering?

Geosteering is the process of correcting the well's trajectory in real-time in order to increase the penetration of the most productive part of the reservoir. The trajectory adjustment decisions are based on the logging and measurements taken while drilling (LWD/MWD).

This real-time data is analyzed together with apriori data. This gives you the best understanding of the situation immediately by using Geosteering Office.

Geosteering support is carried out daily around the clock (24/7/365). Two geosteering engineers per shift perform the loading and processing of the data and give recommendations for changing the well's trajectory when necessary.

What is geosteering used for?

Errors and uncertainties arising during well planning and drilling require critical decisions for creating horizontal wells. The magnitude of the error is proportional to the size of the target interval, which leads to a high risk of losing part or all of the horizontal section outside the target reservoir. Such errors include the vertical resolution of the seismic data, which leads to uncertainty about the depth of reservoir and its structural dips. Other errors are associated directly with the calculation of the well's trajectory while drilling, such as survey errors and the calculation of the well's trajectory between the surveys.

For example, for a horizontal well 3,000-3,500 meters long, the total error can reach several meters vertically. Geosteering horizontal wells based on LWD will minimize such risks and provide the most accurate understanding of the well's trajectory and position, thus allowing you to make corrections in real-time when necessary.

The blue line represents the planned trajectory, and the red line shows the actual trajectory. This example shows how geosteering a well in the reservoir and changing the angle of occurrence of the planned model by no more than 0.6 degrees has increased the sinking of the manifold (NTG) from 35% to 92%.

What methods and measurements are used for Geosteering?

There two main methods of geosteering based on the measurements:

  • Logs. Geosteering includes comparing actual and synthetic curves. Actual logs are obtained from LWD. These could be GR, RES, NEUT, DENS logs, or any other 1D logs. Synthetic logs are obtained from the offset wells.
  • Images. Geosteering includes dip picking on the images acquired from LWD. Common images used include GR, DENS, and Laterolog. Knowing the quantity of the dip allows a geosteering engineer to better predict the behavior of the structure. 
Geosteering with images allows engineers to understand structural dips when there are similar log responses on the top and bottom of the target interval.