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Using ROP and Gas ratio Data to Improve Geosteering Performance

Fathi Hafshejani, Sina | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57202 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Jamshidi, Saeed
  7. Abstract:
  8. Geosteering is a process that is used in drilling oil and gas wells and its main goal is to reach hydrocarbon layers with high accuracy and optimal extraction from them. ROP is the distance drillied per unit of time, which has applications such as formation evaluation, boundary detection and maintaining the well path in geosteering. Gas ratio is another important parameter in this project which is strongly influenced by porosity, permeability and ROP. First, we give a brief introduction of various logs used in drilling like gamma-ray, density, neutron and sonic. Then in the literature review, we examine geosteering technologies such as automatic geosteering and machine learning. As we know, the cost of geosteering the wells is high, so a way should be found to reduce it. In this project, the goal is to find a logical and repeatable correlation between the ROP and the Gas ratio data at the same time as confirming the geosteering. First, we geosteering 3 laterals in a heterogeneous limestone reservoir (Sarvak reservoir – South Azadegan field) using Starsteer and Geomaster software, and then we draw the different states of ROP graph according to the gas ratio in MATLAB software. In order to check the depth of the layer more accurately, the graphs of the ROP and Gas ratio vs. MD in the lateral and reference wells are used. In the results section, we can see that the accuracy of the correlations for lateral 2, which is located in a part of the reservoir where the heterogeneity was low, is higher than the correlations of the other 2 laterals. If we examine the decreasing part in both graphs of MD according to Gas ratio and ROP in lateral 1 and 2, we can see that the accuracy of the correlations of ROP according to Gas ratio increases significantly compared to the correlations of the total data. This result applies to the incremental part for side well 3. Finally, by using these results, as long as these correlations were established in that reservoir, one can expand the laterals of a field or drill a new lateral without using geosteering, which costs a lot
  9. Keywords:
  10. Geo-Steer Drilling ; Heteroscedasticity ; Gas Ratio ; Penetration Rate ; Courve Fitting

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