Aim of the project is efficiency increase of hard rocks destruction at borehole bottom by developing DRILLING mud solution and evaluation of its influence on DRILLING process. The article presents the results of studies directed on studying of DRILLING mud composition (the choice of reagent concentrations, taking into account the filtration properties, structural and rheological parameters, study of the temperature effect influence on the quality of the solution). Experiments of metallic indenter penetration into the glass sample at various number of strikes in the water and surfactant solutions are presented in the article. Paper also offers investigation devoted to development of clayless mud solution with surfactant addings, which will allow increase of hard rocks destruction efficiency. Results of industrial test trials of developed mud solution are also represented, showing implementation of developed DRILLING mud composition to increase productivity of DRILLING operations by maintaining high DRILLING speed and advance per bit.

The continuous development of global economy with decreasing in available hydrocarbon sources and increasing discovery and extraction costs due to decrease in-situ oil and gas reservoir, displays the necessity of using new techniques for the improve rate of penetration and productivity in well. Nanotechnology has already contributed significantly to technological advances in the energy industries. Nanotechnology has the potential to introduce revolutionary change in DRILLING industry. Nanotechnology produces nanomaterials with many attractive properties, which can play an important role in intensifying mud cake quality, reducing friction, eliminating differential pipe sticking, maintaining borehole stability, protecting reservoir, and enhancing oil and gas recovery. Nano fluids can be designed by adding nano-sized particles in low volumetric fractions to a fluid. The nano particles modify the fluid properties, and suspensions of nano-sized particles can provide numerous advantages.This paper presents an extensive literature review of assessing the applications of nanomaterials in DRILLING and DRILLING fluids, and evaluates the potential technical benefits that these nanomaterials might provide to petroleum development and production.

Hole cleaning is one of the most important aspects of extractive DRILLING operations. When drill cuttings combine with DRILLING fluids, cutting bed gel is created, which becomes extremely challenging to remove while DRILLING. One of the functions of DRILLING fluid when the flow is static is to maintain the drill bits' suspension. However, the settling of drill bits makes this nearly impossible. In this paper, the influence of fluid viscosity on hole cleaning performance was critically studied through a series of laboratory experiments. The effects of different viscosity levels on hole cleaning were investigated. This paper evaluated the use of lecithin and carboxymethyl hydroxyethyl cellulose (CMHEC) as a viscosifier and fluid loss agent in oil-based DRILLING fluid. The rheological properties of the formulated DRILLING fluids were determined at various temperatures according to the API 13B-2 specifications in order to identify the most suitable mud type for high-temperature DRILLING operations. From this study, it was discovered that Formulation B has the best rheology, with a plastic viscosity (PV) of 12, 7, and 7 cP at 30, 40, and 50 °C, respectively, while its yield point (YP) was found to be 30, 24, and 16, respectively. These values were compared with the generic oil-based formulation (A), which had a plastic viscosity (VP) of 43, 39, and 22 cP at 30, 40, and 50 °C, respectively, while its yield point (YP) was found to be 38, 20, and 26, respectively. The findings show that formulation B has a significant resistance to high temperatures, which means that it can be applied to DRILLING operations in reservoirs with high temperatures. It is more environmentally friendly. Furthermore, this paper explores the implications of the results in terms of the efficiency of hole cleaning and the DRILLING process relative to the viscosity of oil-based DRILLING fluid. This paper concludes by providing suggestions for improving DRILLING efficiency through the selection of an appropriate DRILLING fluid viscosity.

The aim of this paper is to analyze the sensor errors in measurement while DRILLING (MWD) instrument used in directional DRILLING operations. The MWD consist of three orthogonal accelerometers, three orthogonal magnetometers and one temperature sensor. The system formulation is achieved through the system analysis and functional consideration. The obtained formulation is validated and verified by comparing the results obtained from measurements and simulations. The accelerometers calibration, to estimate bias factors, scale factors and non-orthogonal factors of sensors, is done using optimal non-linear Newton Raphson algorithm by considering the high temperature calibration coefficients. The accuracy of the experimental results, obtained from several measurement while DRILLING systems in Iranian national oil DRILLING company shows the effectiveness of the approach.