Water-Based Drilling Fluid for HP/HT Applications

Abstract

fax 01-972-952-9435. AbstractThe superior performance of invert emulsion fluids in challenging drilling operations such as HT/HP wells makes them the preferred fluid for such applications. However, there are instances such as drilling in environmentally sensitive areas, or where costs and logistics become prohibitive, where their use is undesirable. In such circumstances, a highperformance water-based drilling fluid is the only option available. A main challenge in developing a water-based fluid for such applications has been to maintain the stability of key fluid properties such as rheology and fluid loss at temperatures in excess of 130°C. Conventional additives, such as biopolymers or synthetic polymers, either become ineffective at such high temperatures or generate too high a rheology when used in quantities needed to curb fluid loss. This paper discusses a novel water-based drilling fluid system in which the synergy of the key fluid components produces a stable rheology and low fluid loss at temperatures approaching 200°C. Furthermore, by balancing the components of the novel system, fluid rheology can be controlled to meet the hydraulics and hole-cleaning demands of the drilling operation. 1, 2

Experimental investigation of the effects of SnO2 nanoparticles and KCl salt on a water base drilling fluid properties

“…[14,15] Moreover, selection of WBM relies on treatment ability and appropriate properties which are achieved with adding different additives. [10,11,[16][17][18] Any particle which has dimensions between 1-100 nm is called a nanoparticle. [19] Recently, nanoparticles have been used in various scientific and engineering fields and numerous studies have been conducted based on nanoparticles.…”

HP-HT Drilling Mud Based on Environmently-Friendly Fluorinated Chemicals

“…A weighting material is added to adapt density. Tehrani et al [13] developed a new water based drilling fluid relying on the synergy between the weighting agents (manganese tetraoxide or barite) and the selected polymers (modified acrylic polymers and polyvinylpyrolidone). The system showed good thermal stability up to 180°C.…”

Influence of an ionic liquid on rheological and filtration properties of water-based drilling fluids at high temperatures

“…However, due to their higher initial costs, more stringent pollution-control procedures required and more difficult treatment for lost circulation of OBMs, high temperature-resistant WBMs are the preferred choice in deep-drilling applications (Bland et al, 2002;Mario et al, 2007;Zhang et al, 2015). However, WBMs often become ineffective at high temperatures in deep drilling because of their unstable rheological properties, which greatly reduce the hole-cleaning capacity (Tehrani et al, 2007;Alsabagh et al, 2014). Moreover, the increase in the filtration volumes of WBMs into sub-surface formations can reduce oil and gas permeability after mud exposure.…”