One Sack Rapid Mix and Pump Solution to Severe Lost Circulation

Abstract

Abstract Lost circulation events continue to plague drilling operations. Severe lost circulation can result in complete loss of the hole along with drilling equipment. When attempting to stop massive losses, rapid preparation and placement of a lost circulation treatment will improve the frequency of successful application. A fiber pill formulation has been developed to address common operational concerns that exist with current lost circulation pill procedures. The one-sack product is designed for rapid mixing and pumping with a minimum of equipment. This product does not require any activators, retarders, set time calculations, or temperature activation. Laboratory testing has demonstrated the ability of the fiber pill slurries to rapidly dewater/de-oil and form a sealing plug. Testing also indicates that the fiber product formulated as a weighted pill with barite will form a plug with measurable compressive strength. The fiber product can be used with a wide range of fluids including freshwater, brines, and base oils. The product, which meets environmental requirements for use in the Gulf of Mexico, can be rapidly mixed and pumped on location using standard rig equipment. The fiber formulation is compatible with all mud systems and is easily removed with standard solids control equipment. This new approach to control severe losses has been successfully applied in several field tests. A few of these field applications will be discussed in detail.