Multidisciplinary Approach, Key Factor in the Development of Complex Stratigraphic Fields in Colombia, Case Study: Llanito Field

Ramos, Hernan¹; Puerta, Maribel; Sachica, Jorge A.; and Chaparro, Carlos H.
¹[email protected]

"Llanito District is located in Middle Magdalena Basin, Colombia. It has 306 wells and a cumulative production of 76.8 MMBO rated at December 2009. Their production comes from Terciary Mugrosa and Colorado Clastic Formations with a complex identification of potencial zones to be drained.

The development of this district began in 1945 with the discovery of Galan Field by Tropical Oil Company and during their operation the Llanito field was discovered by Ecopetrol (first discovery of the company); as a part of the second development of Llanito Field, in 1985, Gala field was discovered.

Important technological advances had been carried on in this district, like fresh and brine waterflooding pilots in galan Field. Their good results lead to the implementation of waterflooding project in the neighbor Casabe Field, one of the most important fields of Ecopetrol. In 2004, the third development of Llanito began with the perforation of 50 wells and the later 3D seismic adquisition and interpretation in 2009.

Based on the 3D seismic interpretation aided with a multidisciplinary approach of the new information adquired was possible accomplish the following tasks:
- A new structural model. - Identification of new potential zones based on the combination of seismic inversion, sedimentological studies and production test interpretation.
- Petrophysical model calibration with the new wells drilled and a better risk assessment in the selection of zones to be perforated.
- A new reserve incorporation strategy was implemented by the perforation of wells with RNPPr and RNPPo classification reserves.
- Near field prospect identification focused in deeper cretaceous Formations.
- Optimization in Well arquitecture design, lifting equipment and production monitoring activities.
- With the aid of the previous items and the lifting cost re-evaluation, was possible optimize the economics of the field and lead an aggressive portfolio with future activities for several years.
- OOIP updated with an increment of 47%.

Impacts and Benefits:
Increment in Production, Better OOIP Calculation, Technological Innovation in 3D Seismic interpretation tools. "

AAPG Search and Discovery Article #90166©2013 AAPG International Conference & Exhibition, Cartagena, Colombia, 8-11 September 2013