After more than 20 years of intensive production in XiJiang oil field, a
sand group that consists of multiple reservoirs with a thin oil column of less
than 4 m and with strong bottom water drive has been revisited. Some
assessments were made previously, including drilling horizontal wells with
average recovery factor of only 2.3%.
In early 2013, new horizontal well drilling was initiated to reassess
these reservoirs with a different approach. The objectives were to optimize the
standoff between the lateral and the oil/water contact, which is very critical
to well performance, by placing the lateral as close as possible to the
reservoir top and to evenly regulate the downhole flow across the draining
The program was successful in reassessing the development reservoirs in
the mature oil field that had previously been considered to be uneconomic
through a reentry horizontal well drilling program and the implementation of
the best practices in operations.
The operational practices included the precise landing and lateral
placement of horizontal wells and the use of inflow control devices (ICD) for
completion. Logging-while-drilling (LWD) bed-boundary mapping, with the ability
to map multiple key boundaries, including fluid contact for precise well
placement, was integrated with multifunction formation evaluation LWD, which
provides real-time formation evaluation to optimize the ICD design for
Outstanding outcomes have been observed upon the completion of the
- producing with 1,600 BOPD with 5% water cut
- achieving 56% higher cumulative incremental oil than the best
previous horizontal well
- exceeding the economic level threshold to develop.
Comparison of new and the past well performance support the acquisition
of the new field data. The successful approach, best practices, and valuable
lessons learned provided a breakthrough in developing the previously
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