Lost circulation composition
View Patent ↗A composition of matter and a method of sealing a permeable formation is provided incorporating the composition to reduce or eliminate lost circulation in permeable formations. The composition comprises one or more sealing components, ranging in size from approximately 10 to approximately 750 microns, a wetting component, a viscosifier component and an activator or flocculant. A dry mixture of the components may be added directly from the bag to the drilling mud to the permeable formation and will not set up inside the drill string. The mixture will seal the formation in an aqueous or organic environment, thus removing the need to form a pill in a slugging pit prior to introduction. The mixture dewaters at a rapid rate without regard to the time and temperature required for curing agents or other additives. The mixture does not require additional agents such as defoamers, accelerators, retarders or spacers to dewater and set as a solid plug.
1. A lost circulation composition comprising a dry mixture of:
between approximately 30% and approximately 95% by weight of at least one bridging component, at least one sealing component, or at least one bridging and one sealing component;
between approximately 5% and approximately 25% by weight of omnibase wetting and binding component;
between approximately 0.5% and approximately 4% by weight of viscosifier component, and
between approximately 1% and approximately 8% by weight of activator component.
2. The composition of claim 1 comprising:
between approximately 46% and approximately 56% by weight of diatomaceous earth;
between approximately 8% and approximately 18% by weight of nut shells;
between approximately 10% and approximately 20% by weight of wood flour;
between approximately 10% and approximately 20% by weight of gilsonite;
between approximately 1% and approximately 3% by weight of xanthan gum, and
between approximately 2% and approximately 6% by weight of lime.
3. The composition of claim 1 comprising:
between approximately 50% and approximately 52% by weight of diatomaceous earth;
between approximately 12% and approximately 14% by weight of nut shells;
between approximately 14% and approximately 16% by weight of wood flour;
between approximately 14% and approximately 16% by weight of gilsonite;
between approximately 1% and approximately 3% by weight of xanthan gum, and
between approximately 3% and approximately 5% by weight of lime.
4. The composition of claim 1 comprising:
51% by weight of diatomaceous earth;
13% by weight of nut shells;
15% by weight of wood flour;
15% by weight of gilsonite;
2% by weight of xanthan gum, and
4% by weight of lime.