Impact of the drilling fluid system on the effectiveness of a high pressure jetting assisted rotary drilling system

Abstract

An enhanced drill bit combining high pressure fluid jetting with a conventional rotary drilling system incorporating a tailored drilling fluid was designed to improve drilling performance in hard crystalline rock. Full scale drilling experiments (8 ½ inch bit size) were performed utilizing a specially designed sepiolite fluid and comparing its performance with water and xanthan gum as a standard geothermal drilling fluid. The novel drilling system improved the rate of penetration by over 70% compared to the conventional drill bit without jetting assistance. In addition, the sepiolite drilling fluid retained its fluid properties even after high pressure jetting.

RETRACTED ARTICLE: Micronized calcium carbonate to enhance water-based drilling fluid properties

“…The yield point showed an increase after adding different concentrations of micronized CaCO 3 . By enhancing the plastic viscosity and yield point of drilling fluids, the overall cost of the drilling operation can be reduced as it helps to improve the rate of penetration and enhances hole cleaning 48 . On the other hand, extremely high yield points can induce uncontrolled increases in circulation pressure loss, resulting in significant equivalent circulation density (ECD).…”

Influence of HEM Drilling Fluid on Organic Geochemical Characteristics of Deep-Water Source Rocks in the Qiongdongnan Basin

“…The most common types of drilling fluid are water- and oil-based. Water-based drilling fluid is currently the most widely used in petroleum exploration, while oil-based drilling fluid is predominantly utilized in high-temperature and high-pressure geological settings. − In recent years, petroleum exploration in the Qiongdongnan Basin has increasingly focused on deep-water areas (high-temperature and high-pressure), with water depths exceeding 2000 m. This trend has introduced new requirements for current drilling technologies. , Traditional water-based drilling fluid softens the drilling cuttings, while oil-based drilling fluid will seriously contaminate geological samples. The HEM water-based fluid system was developed and successfully applied in the Qiongdongnan Basin .…”

“… 2 − 4 In recent years, petroleum exploration in the Qiongdongnan Basin has increasingly focused on deep-water areas (high-temperature and high-pressure), with water depths exceeding 2000 m. This trend has introduced new requirements for current drilling technologies. 5 , 6 Traditional water-based drilling fluid softens the drilling cuttings, while oil-based drilling fluid will seriously contaminate geological samples. The HEM water-based fluid system was developed and successfully applied in the Qiongdongnan Basin.…”