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Unconventional Petroleum Resources 135
• Case Studies: Insights into significant projects c. Well Uptime Improvement: Several
measures have been taken to improve
A. RG(East)-CBM-2001/1: The CBM Block well uptime. 3½” tubing was introduced
RG(East)-CBM-2001/1, covering an area of just above the pump to reduce HIT issues.
approximately 500 Sq.km, was awarded Moulded rod guides and tubing rotators
to M/s Essar Oil Ltd in 2002. The block is in were added to reduce rod failure due to
Production since July 2016. Some of key torque and/or well trajectory. Blast joints
highlights of the CBM project in RG(East) have been introduced, and tungsten and
are: liner-coated tubing are being used to
Drilling of more than 450 development wells. minimize wear and corrosion. Hydraulic
Regulated Progressive Cavity Pumps
Current production rate is 0.95 MMSCMD. (HRPCP) were also implemented to
improve MTBF.
Implementation of technological
advancements as: d. HVFR (High Viscosity Friction Reducer)
has been used as it has very less residue
a. Advanced Chemical Stimulation: Coal as compared to Guar based linear gel to
fines accumulation near the wellbore increase frac half-length as permeability
reduces water and gas output and is very low due to overburden stress.
leads to productivity loss and well failure
issues like rotor locking. To address e. Planned to drill Horizontal wells in
this, surfactant flushing has been deeper, tight CBM reservoirs to address
implemented to clear near-wellbore permeability challenges which may
damage, improving water mobility and have better productivity due to greater
gas production. Recent flushing showed coal seam exposure.
positive results, and it is planned to apply
this in 20% of reactive wells. Extensive data acquisition programme
underway in the deeper area to identify
b. Microbial techniques to enhance oil opportunities in deeper CBM to open-up
recovery by breaking down organic newer areas of development & increase
materials. This technique facilitates the reserves base.
microbial communities involved in the
dynamic process of methanogenesis The exploration of Shale gas is also underway
to further increase the methane in RG(East) CBM Block.
production from the biodegradation of
coal over timescales.
