Stimulating subterranean zones

摘要

In some implementations, a method for stimulating a subterranean zone includes pumping stimulation fluid through a tubing string in a wellbore during a stimulation process. The tubing string includes a plurality of sleeves with each associated with a different treatment zone of the subterranean zone. A time for each of a plurality of different sealers entering the tubing string is detected. Each of the plurality of different sealers is associated with a different one of the plurality of sleeves. A location of the plurality of different sealers in the tubing string is substantially determined based, at least in part, on the associated entry time.

主权项

1. A method, comprising:
pumping stimulation fluid through a tubing string in a wellbore during a stimulation process, the tubing string including a plurality of sleeves with each associated with a different treatment zone of the subterranean zone; detecting a time for each of a plurality of different sealers entering the tubing string, each of the plurality of different sealers associated with a different one of the plurality of sleeves; estimating, for each of the plurality of different sealers, a time of arrival at a sleeve corresponding to each of the plurality of different sealers based, at least in part, on the associated entry time; in response to each of the plurality of different sealers arriving at the corresponding sleeve, pumping stimulation fluid into a corresponding treatment zone in accordance with one or more specified parameters, each of the different treatment zones stimulated at different times during the stimulation process and for a specified period of time, wherein the stimulation fluid is continuously pumped when switching between different treatment zones; determining, for at least one particular sealer of the plurality of different sealers, that an actual time of arrival of the particular sealer is different than the estimated time of arrival of the particular sealer; based on the difference exceeding a threshold, determining that an error occurred in the stimulation process; and based on the determined errors, taking a corrective action for the stimulation process.