Abstract: A technique facilitates stimulation of multiple well zones along a multilayered reservoir. The technique utilizes equipment constructed to enable performance of the stimulation job along the multiple well zones, i.e. two or more well zones, prior to gravel packing the multiple well zones. The equipment enables performance of the stimulation job during a single trip downhole. Subsequent actuation of the equipment further enables a multizone gravel packaging operation during the same trip downhole.

Abstract: Methods and devices for controlling access to sensitive data stored in a computer system are provided. For at least some data entries in a dataset, each identified by a respective key, an indicator of which zero or more conditions of a plurality of queries are satisfied by that data entry is generated. The keys are grouped into cohorts based on the indicators, at least some of the cohorts comprising keys identifying data entries satisfying the same zero of more conditions. A first output is transmitted to the first computing device comprising an identifier of a first cohort and an indication of a condition which is satisfied by data entries identified by keys in the first cohort. A second output is transmitted to a second computing device comprising an identifier of the first cohort and a set of keys corresponding to the data entries in the first cohort.