the main task of drilling the formation by the bit is done via scraping, crushing and grinding. discharging the fluid from the bit nozzles is done with high pressure which assists to break the rocks. different parameters affect the bit selection and design for each drilling formation, but the most important one is drillability that depends on hardness of the formation. in this paper, the design...

The challenges posed by elevated rock hardness, deficient drillability, excessive friction torque, and significant underpressure in extended−reach horizontal wells are the primary factors that contribute to low ROP (Rate of Penetration) limited reach during drilling operation. Reducing drag is one methods addressing aforementioned challenges. To augment pulse output characteristics oscillating ...

Abstract The tight oil reservoir rocks in the Jidong Oilfield are generally characterized by high hardness, strong abrasiveness, and extremely unevenness, which seriously reduce drilling efficiency. In view of this problem, mineral composition, plasticity coefficient, drillability were first determined. It was found that rock integrity, compactness hardness main factors leading to low breaking ...

Clinically used mineral bone cements lack high strength values, absorbability and drillability. Therefore, magnesium phosphate have recently received increasing attention as they unify a mechanical performance with presumed degradation in vivo. To obtain drillable cement formulation, farringtonite (Mg3(PO4)2) oxide (MgO) were modified the setting retardant phytic acid (C6H18O24P6). In pre-testi...

This work evaluates the effect of high temperatures and cooling methods on drillability Prada limestone. Samples from boreholes drilled during design stage Tres Ponts Tunnel in Catalan south Pyrenean zone (Spain) were subjected to 105, 200, 300, 400, 600 °C, then cooled at a slow rate or by quenching. Sievers’ J-value (SJ) brittleness (S20) determined thermally treated samples, drilling index (...

The Qiulitage structural belt in Tarim Basin has a large reservoir burial depth and complex geological conditions. Challenges such as ultra-depth, high temperature, pressure stress lead to significant problems related well control safety project efficiency. To solve these key technical issues that set barriers the process of exploration development, drilling technology via integration geology eng...

Rock abrasivity, as one of the most important parameters affecting the rock drillability, significantly influences the drilling rate in mines. Therefore, rock abrasivity should be carefully evaluated prior to selecting and employing drilling machines. Since the tests for a rock abrasivity assessment require sophisticated laboratory equipment, empirical models can be used to predict rock a...

This paper presents a new methodology to predict the wear for three-cone bits under varying operating conditions. In this approach, six variables (weight on bit, rotary speed, pump rate, formation hardness, bit type, and torque) were studied over a range of values. A simulator was used to generate drlling data to eliminate arrors coherent to field measurements. The data generated was used to es...