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Productivity stimulation of depleted reservoirs by applying new technologies to open the productive layers

Vlasin I., Stefanescu D.-P., Sutoiu F.

AGH Drilling, Oil, Gas

2017

Vol. 34, no. 2

569--576

The greatest natural gas fields belonging to Romgaz company are characterized by an advanced stage of exploitation, which actually involves a special approach, from the perspective of the works performed in the wells. As part of the most recently Romgaz strategy, for these fields have been created new geological models based on 3D seismic acquisitions, which allowed identifying some new less drained or even undrained zones. This aspect created the premises for developing the opportunities for capitalization of the new reserves volumes, by applying the advanced technologies of opening productive layers by perforation and reperforation operations with deep penetration guns, using also underbalance conditions. We mention also that new cased hole geophysical methods like PNN and RCI consisted also important elements in establishing the perforation intervals and identifying the by-passed layers. The paper contains some relevant case studies, which illustrates the efficiency of these new methods.

Liquid unloading optimization from gas wells which exploit depleted reservoirs

Tataru A., Stefanescu D. P., Simescu B.

AGH Drilling, Oil, Gas

2014

Vol. 31, no. 2

241--

One of the most important aspects in natural gas exploitation, which must be constantly monitored, is the liquid impurities loading in gas wells, mostly in depleted reservoirs. The extension of this phenomenon is observed, as the natural gas reservoirs are depleted, thus substantially reduction of the reservoir pressure. The increasing quantity of liquid impurities is a major problem in gas depleted reservoirs exploitation, which could not be naturally removed in energetical depletion conditions. In this period, to avoid liquids acumulation and afterwards flooding, wells must produce with a minimum flow, named critical flow, under whose value is not possible the unloading of accumulated liquids. Wells can produce without liquid accumulations if in the tubing is obtained a gas flow velocity, greater than the liquid drop free dowfall speed limit. The velocity and critical flow depend on bottom hole or surface dynamie pressure, flow section diameter, liquid and gas density, water superficial strength. Liquid flow inerease during gas depleted reservoir exploitation, but only a part of this quantity is naturally unloaded by gas stream, the other part tend to accumulate to the bottom hole. In this conditions, the dynamie bottom hole pressure will inerease continuosly, causing continuous dropping and pronounced gas flow rate, until the well floods and stops producing. Early recognition of signs that indicates well liquid loading and the most suitable lifting system selection can eliminate problems before the production drops and layers damage.