Integrated service increases reservoir contact and flexibility
Schlumberger recommended the BroadBand Precision service, which integrates a number of products and services to target all of the promising hydrocarbon-bearing zones along the lateral and ensure each receives a stimulation treatment optimized for its particular characteristics.
By coordinating multiple services into one offering, the BroadBand Precision service improves operational efficiency. Integrated reservoir modeling and measurement data are considered alongside water, proppant, and equipment constraints to optimize completion and simulation designs and operations for maximum return on investment.
Cemented sliding sleeves eliminate ball-size constraints that limit the number of stages per well in conventional ball-drop completions. In addition, the fullbore sleeves improve operational efficiency by maintaining the well’s diameter without costly and time-consuming poststimulation milling. As the well matures, the sleeves also enable an operator to seal off specific zones and stop unwanted water or gas production.
Gazpromneft-Yamal decided to use the BroadBand Precision service for two wells. Modeling with the Kinetix stimulation software suite led to a recommendation for 20 fracturing stages per well in a 1,000-m [3,280-ft] horizontal section, which reduced the distance between stages from 130 to 50 m [427 to 164 ft].
Oil production meets expectations—with less water and gas
To isolate each stage, sliding sleeves were run in with the well casing. For stimulation, coiled tubing (CT) was run into the well to open and close the sleeves and clean out excess proppant between stages, including any screenouts. CT remained in the well for the entire process with each fracturing stage pumped through the casing-to-CT annulus, improving operational efficiency.
Initial production from the first well was 188 t/d [1,343 bbl/d] of oil. After both wells were on production, the water cut was calculated at 39%, as compared with the average of 60% in neighboring wells. The gas-to-oil ratio was 472 m3/t, as compared with the average of 800 to 1,000 m3/t in neighboring wells, an improvement of 41% to 52%. Stimulation time was also reduced by 44%, mostly by eliminating milling requirements.
For more details, see SPE-187680 and SPE-187715.