A Brief Discussion on Using Down-the-Hole Drill Pipes to Tackle Challenges in Stabilizing Drilling Fluids and Controlling Cuttings-Induced Mud Formation
17 Jun,2020
Subsurface drill rods occupy a crucial position among drilling accessories. When the formation is relatively stable, drilling rigs can use solid-free drilling fluids—simply by adding sufficient flocculant—to ensure that cuttings easily settle at the surface while maintaining the fluid's performance consistently.
Down-the-hole drill rod It occupies a crucial position among drilling accessories. When the formation is relatively stable during operation, the drilling rig can use solid-free drilling fluids—simply by adding sufficient flocculant—to ensure that cuttings easily settle on the surface while maintaining the fluid's performance consistently stable.
However, in complex formations, where wellbore collapse is a concern, it’s essential to prepare a mud with appropriate density, viscosity, fluid loss properties, and salinity levels before entering unstable sections—though this can negatively impact the settling of cuttings.
① Water loss cannot be reduced to zero—otherwise, the cuttings will inevitably hydrate, swell, and disperse.
② The higher the specific gravity, the slower the rate at which rock debris sinks;
③ The higher the viscosity, the slower the cuttings will sink;
④ The network-like structure formed by the mud, as well as the adsorption of cuttings by fluid loss additives, both influence how the cuttings settle on the surface. Consequently, cuttings inevitably contribute to mud generation, leading to increased mud density and viscosity—conditions that complicate drilling operations. Down-the-hole drill rod Their work brings about numerous adverse effects. Although some drilling teams are equipped with desilters, none of them can fundamentally solve the problem.
In recent years, some domestic oilfields have experimented with shale inhibitors such as polycationic gels, small cationic polymers, and polyalcohols, achieving certain levels of success. However, these methods can only relatively reduce the rate at which drill cuttings generate mud, and they also come with significantly higher costs.
While the optimal system—potassium-ammonium-cationic polymer—is cost-effective, it fails to completely prevent shale from generating mud, resulting in a 0.01 increase in specific gravity per 100 meters.
How to suppress cuttings-induced mud formation at a lower cost, stabilize drilling fluid performance, and comprehensively enhance drilling efficiency is a critical challenge urgently needing solutions in the drilling industry.
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