From Four Runs to One: First Single-Trip Multizone Gravel Pack Lower Completion Enables Sand Control, Zonal Isolation, Saves $5 Million USD in Rig Time

Economically develop two marginal small-pool gas reservoirs from a single wellbore while improving project economics and reducing development cost.
Enable individual or comingled production from both reservoirs based on the depletion plan to maximize recovery and extend production life.
Reduce rig time and completion complexity by eliminating unnecessary trips and separate gravel-pack pumping operations.
Maintain effective zonal isolation to help prevent crossflow and reduce the risk of early water breakthrough.

Selected an openhole, shunted-screen lower completion to provide sand control across both producing intervals.
Designed the lower completion for single-trip installation and one gravel-pack pumping operation to reduce rig time and simplify execution.
Incorporated an openhole mechanical zonal isolation packer and shunted swellable packer to provide positive isolation between the two reservoirs.
Used 5 1/2-in shunted openhole screens, integral seal bore screens, blanks, ETS, zonal isolation SZE packer, shunted swell packer, and 4.562-in and 4.250-in seal units.
Positioned seal assemblies after the lower-completion installation and gravel packing to enable individual or comingled production based on the depletion plan.

Installed the lower completion in a single trip, with the zonal isolation packer set and both producing intervals gravel packed during one pumping operation.
Reduced lower-completion trips from four to one, eliminating three additional runs and saving approximately seven rig days.
Delivered more than $5 million USD in rig-time cost savings while helping make marginal small-pool gas reservoirs economically viable.
Enabled controlled individual or comingled production from both zones while mitigating crossflow and early water-breakthrough risk.
Delivered the first single-trip, multizone lower completion in Trinidad and Tobago, establishing a benchmark for future small-pool gas developments in the region.

Details

Location

Trinidad and Tobago

Well Type

Development, producer

Formation

Unconsolidated sandstone reservoirs separated by competent shales

Rig Type

Jack-up

Casing Size and Type

9-5/8 in, 53.5 lb/ft casing

Depth

7,715 ft (2,352 m)

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From Four Runs to One: