Job Description:
The work was carried out in 3 stages:
- Building a 4D geomechanical model;
An assumption was made about the effect of reservoir depletion on the stability of the borehole due to the development of an adjacent site. 4D modeling was performed, that is, the forecast of mining and geological conditions and a safe drilling window, taking into account the pressure reduction in the formation. The forecast showed a narrow window for safe drilling in the formation.
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Рис. 1 WBS for the design and optimal trajectory
- Optimization of well construction at the planning stage;
Understanding the safe drilling window and its dependence on the drilling direction made it possible to determine the safest drilling azimuth of the horizontal part and the optimal mud weight.
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Рис. 2 Changing the trajectory of the horizontal hole from the design to the optimal one
The types of risks of geological and technological complications, as well as the intervals of their occurrence, are determined.
The volume of possible collapse sludge has been determined, recommendations for borehole cleaning in the form of a hole conditioning map have been issued.
- Geomechanical support of well construction
During the drilling process, 24/7 monitoring of drilling was carried out, with support, the parameters of the safe drilling window were updated, according to the results of which recommendations were issued on the operational parameters of drilling and mud weight.
Result:
2 horizontal holes were optimized and drilled without complications. The average drilling time of the horizontal part is 18 days, reducing drilling of the horizontal part by 5 times.
