Don't Stop Drilling Operations but Use Customized Cross-Linked LCM Solution for Fractured Formations

Abstract

Abstract Curing drilling fluids losses in fractured and sandstone formations is the most challenging scenario to drilling team. Loss zones are unpredictable, due to large vugular zones, extended and connected fracture structures or in interbedded sandstone formations. However, based on proper evaluation of the offset wells data, loss events can be anticipated. Typically, conventional lost circulation material (LCM) pills containing various particle size distributions are part of the lost circulation armory in fractured sections. However, results show variation. This cross-linked LCM is distinguished for those situations with the most-severe lost circulation, as these cross-linking polymers will produce a rubber gel structure. This chemical blend has extremely effective sealing characteristics that are used as an innovative approach to the initial response to lost circulation. Depending on the bottom hole temperature, a retarder will be used to customize the mentioned LCM solution. This paper discusses a Customized Cross-Linked LCM Solution for Fractured and Sandstone Formations, based on a customized blend of high and low molecular weight anionic polymer, reinforcing material and cross-linking agent that has an extremely effective sealing characteristic. In addition, it can be pumped through the regular bottom hole assembly without losing rig time associated with tripping and mixing conventional LCM treatment.