Abstract
This paper presents the applied methodology and results obtained from a new
Well Management program to improve oil and gas recovery with minimum
investments in certain asset units. In addition to the value of the increased
production, the following benefits were obtained from this program: learning
and applying the teamwork approach of well productivity improvement, adaptation
to a cultural change of working as teams to solve difficult problems, and
training and transfer of diverse technologies from the interdisciplinary teams
to other technical personnel of PEMEX E&P.
Introduction
The South Region of PEMEX E&P has hydrocarbon production from five
exploitation integrated assets including Bellota-Jujo, Cinco-Presidentes,
Macuspana, Muspac and Samaria-Luna. The producer fields and reservoirs of these
assets consist of Tertiary sandstones and Cretaceous naturally fractured
carbonate rocks, and produce all types of petroleum fluids that include dry
gas, wet gas, gas-condensate, volatile oil and black oil, with densities
ranging from 10 °API to superior quality oils greater than 45 °API.
Production in the South Region started in 1958, reaching a peak in 1979 at
1.213 MMSTB/D (continuous black solid line in Figure 1). Although there were
several periods of new field development and workover activity, the oil
production rate had declined to 463,995 STB/D by December 2004. The decline was
caused by pressure depletion and also water invasion.
The peak gas rate of 2,853 MMscf/D was in 1981 (showed as a broken line in
Figure 1). The gas production rate decline was similar to oil, reaching 1,434
MMscf/D by December 2004.
In the first half of 2005, as a result of this strong production decline and in
order to comply with the production agreements of PEMEX E&P, the South
Region Management designed and implemented a strategy to increase production
and to reverse producction decline.
The strategy involves priority management decision lines of action for the
short-, medium- and long-terms of fields in development and/or mature fields.
Short-term projects with minimum investment and excellent economic returns were
given top priority based upon Management's hierarchical decision process
guidelines.
The investment project guidelines for the medium- and long-term projects
include technical justification with economic studies based on the best
practices established by Reservoir Management(1, 2), with the intent to
optimize the exploitation of fields, i.e., maximize the recovery of
hydrocarbons, minimize investments and reduce operating and maintenance costs.
Under this scenario, different alternatives are evaluated in order to help
optimize the decision-making guidelines necessary for reservoir-well-surface
facilities to recover primary, secondary and/or tertiary reserves.
On the other hand, in order to increase short-term production, it is necessary
to plan and implement different schemes to manage and integrate wells from
different fields. This is done with the objective of identifying opportunities
that increase production easily, based on detailed static and dynamic studies
of the productive zones close to and around producing wells, taking into
consideration the production behaviour of the different fields, reservoirs and
wells.
© 2009. Petroleum Society of Canada (now Society of Petroleum Engineers)
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History
- Original manuscript received:
26 March 2007
- Meeting paper published:
12 June 2007
- Revised manuscript received:
6 March 2009
- Manuscript approved:
7 April 2009
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