Abstract
Drilling fluid properties and formulation play a fundamental role in drilling operations. The Classical water-based muds prepared from only the Syrian clay and water without any additives((Organic and industrial polymers) are generally poor in performance. Moreover, The high quantity of Syrian clay (120 gr / l) used in preparing drilling fluids. It leads to a decrease in the drilling speed and thus an increase in the time required to complete the drilling of the well. As a result, the total cost of drilling the well increased, as a result of an increase in the concentration of the solid part in the drilling fluid. In this context, our study focuses on the investigation of the improvement in drilling mud Prepared from the Syrian clay by reducing the clay concentration to (50 gr / L). And compensate for the remaining amount (70 gr / l) of clay by adding (natural and industrial polymers) The rheological properties and filtration are measured at different concentrations of polymers .. In light of the experiments, we determine the polymers' concentrations that gave good results in improving the flow properties and controlling the Filter. It is polymers that have given good results:، HEC، HEC and Xanthan Gum PAC and HEC، CMCHV، PolyAcryl Amid ، Xanthan Gum .
Highlights
One of the most important elements of drilling operations is drilling mud, as it has many functions through which an oil or gas well is drilled as quickly as possible and with minimal problems
It was found that the favorable values of Capacity Index (CCI), YP, gel strength (Gs), and filtration rate could be obtained when the concentration of polymer additives and Syrian clay was kept within the range of (4.3 g): (50 g) in the case of Xanthan Gum (Fig 6(a)), (1.5, 2 g): (50 g) in the case of PolyAcryl Amid (Fig 6(b)), and (3.5-4.4 g): (50 g) in the case of Carboxyl Methyl Cellulose High Viscosity (CMCHV) (Fig 6(c))
It is clear from a perusal of all these curve plots that high these concentrations resulted in an improvement in the classical drilling mud fluids in terms of rheological properties and filtration rate
Summary
One of the most important elements of drilling operations is drilling mud, as it has many functions through which an oil or gas well is drilled as quickly as possible and with minimal problems. An important function of the drilling fluid is to carry rock cuttings removed by the bit to the surface. Syrian clay has a weak ability for controlling (i) the rheological properties (e.g. viscosity, yield point, and gel strength), (ii) filter controlling, (iii) carrying capacity, and (iv) weak ability in cuttings removal and suspend. The drilling mud prepared in the field requires a large quantity of the Syrian clay (about 120 g/l) during the preparation step This excessive quantity may generate major problems related to (i) increase the solids content, (ii) reduce the rate of penetration (ROP), (iii) increase the drilling time, (iv) increase the time of execution of well (v) increase the total cost of drill a well and (iv) increase the filter cake which will altered the formation production. In order to design efficient processes, the analysis of results is used to achieve the optimum performance
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