Majid, Jailani (2025) Evaluasi Blind Drilling Untuk Mengatasi Lost Circulation Di Sumur “x” Dan lapangan “y”. Other thesis, Universitas Islam Riau.

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Abstract

The phenomenon of lost circulation, defined as the entry of drilling mud into the excavated structure, leading to a reduction in the quality of the mud flow, is a subject of concern. To address this issue, a comprehensive analysis is necessary to identify the underlying cause. This analysis involves the calculation and subsequent analysis of various parameters, including formation pressure, formation fracturing pressure, mud hydrostatic pressure, BHCP, and ECD. The objective is to determine the root cause of the lost circulation. The calculations and analysis reveal that the primary cause of lost circulation in well "x" of field "y" is naturally formed fractures (natural fracture) and a low formation pressure gradient. Subsequently, the hydraulic factor evaluation is conducted through a re design of the hydrostatic pressure calculation and a re-design of the bottom hole circulating pressure (BHCP). Concurrently, the mechanical factor evaluation is performed via ROP, RPM, WOB, and torque analysis to ascertain the presence of indications of pinched pipes during the blind drilling method. The blind drilling method was employed, resulting in the acquisition of the following parameters: a hydrostatic pressure value of 1675.39 psi, a mud weight (MW) of 9.6 ppg, a bottom hole circulating pressure (BHCP) of 1335.34 psi, and a Pump P of 419,586 psi. The ROP was measured at 130.0 meters per hour, the RPM was recorded at 70, the WOB was determined to be 10 kilograms, and the torque per bit diameter was established at 7.5 inches. These findings suggest that the indication of a pinched pipe is attributable to the decreasing ROP value. This evaluation is conducted to prevent lost circulation and to address issues related to mud loss during drilling operations.

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