When the OpenPath Reach service is used for acid fracturing (top left) or matrix stimulation (bottom left), the slow-reacting fluid system and engineered pumping schedule increase reservoir contact as compared with conventional acid fracturing treatments (top and bottom right).
Reservoir contact is a critical element of a successful carbonate stimulation treatment. The high reactivity of hydrochloric acid (HCl) prevents it from penetrating deeply into the formation. Retarded acid systems such as gelled and emulsified acids have been used to address this problem. However, gelled acids are known to cause polymer damage to the formation, and emulsified acids promote high friction pressures and have surface handling issues that limit their use. Schlumberger introduced the OpenPath Reach extended-contact stimulation service to optimize matrix stimulation and acid fracturing of carbonate reservoirs with an easily handled, retarded, single-phase acid system that overcomes conventional acid-system challenges. Because the acid system is water-soluble, the OpenPath Reach service can be designed with friction reducers and other additives developed for HCl. OpenPath Reach services have been performed in North America and Central Asia. In North America, an operator wanted deep matrix stimulation of a horizontal well through coiled tubing. An OpenPath Reach service was designed to pump the single-phase retarded acid system through the coiled tubing and a diversion product through the backside, allowing for accurate start and stop points to ensure complete, uniform stimulation.
For more information, visit www.slb.com/OpenPath.