A Novel System for Controlling Pore Pressure Transmission, Inhibition, Stabilization and Targeted Lubrication in Water-Sensitive Shales: Proof-of-Concept and Initial Field Results

As the drilling industry pursues more horizontal wells with increasingly complex design (e.g., extended-reach wells, high angle wells), challenges from high friction (e.g., reduced Rate of Penetration [ROP], stuck pipe, severe doglegs or corkscrews) grow more pronounced. These challenges are particularly pronounced in Water Based Muds (WBMs), which have an inherently higher Coefficient of Friction (CoF) than Oil Based Muds (OBMs) or Synthetic Based Muds (SBMs). While there are many lubricity additives that are available to reduce frictional force, these additives may present challenges ranging from adversely affecting the properties of the drilling fluid (e.g., liquid lubricants that may change rheology or interact with other additives) to interfering with drilling equipment (e.g., glass beads that plug valves in mud pulse telemetry systems). To address these challenges, we have developed a novel method for encapsulating lubricant for use as a lubricity additive. Characterization of encapsulated oil in the lab has shown the ability to reduce the CoF of water based mud systems by over 80%. Field characterization of encapsulated oil was corroborated with experimental results; we have observed ROP improvements of 20%, torque reduction of up to 45%, and drag reduction of up to 50% in field scale testing, as well as ROP enhancement of216% in the Alliance/Northern DJ Basin and torque reductions of up to 42% in the Heath Basin. Our field characterization demonstrates the utility of using encapsulated oil in WBMs to improve the operational efficiency of drilling.

Field Results for Encapsulated Oil as an Additive to Water-Based Drilling Fluids: Operational Improvements in the Alliance/Northern Denver-Julesburg and Heath

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Field Results for Encapsulated Oil as an Additive to Water-Based Drilling Fluids: Operational Improvements in the Alliance/Northern Denver-Julesburg and Heath