This paper analyzed the characteristics of managed pressure drilling (MPD) technology and impact of wellhead back pressure on the wellbore annulus pressure profile, and found that the application of this technology provides room for improvement to the current casing program design. Meanwhile, the equivalent density of drilling fluid in wellbore annulus needs to consider the impact of back press...

A transient fully coupled model is proposed to investigate the two-phase flow of CO2 and water-based fluid in a wellbore, considering complex mass heat transfer different patterns dynamic coupling between wellbore reservoir. Based on conservation, momentum, energy balance, employs state-of-the-art equation state transport models analyze variations multiphase behaviors properties wellbore. Appli...

The use of fiber optics within geothermal wells has been extremely limited. The high-temperatures and formation of molecular hydrogen within the well have resulted in the early death of fiber optic cables. This paper reveals reasons for hope to extend the life of fibers for many years. Various fibers have been evaluated for degradation when exposed to ambient molecular hydrogen. Two commerciall...

The porochemoelectroelastic analytical models and solutions have been used to describe the response of chemically active and electrically charged saturated porous media such as clays, shales, and biological tissues. However, these attempts have been restricted to one-dimensional consolidation problems, which are very limited in practice and not general enough to serve as benchmark solutions for...

It is well known that the effect of shale hydration causes wellbore instability due to water phase invasion drilling fluid lamellar rich formations. This because mechanical properties (compressive strength, elastic modulus, etc.) surrounding borehole, which in clay minerals, will decrease significantly after hydration. In this study, using continental stratum southern Ordos Basin, were studied ...

The main forms of gas kicks into the wellbore during drilling in fractured carbonate reservoirs are underbalanced pressure and gravity displacement. These two have different mechanisms entry well control measures, which require timely identification type kick when it occurs. A two-phase flow model with a wellbore-formation coupling was developed, based on rate models. variation characteristics ...

The complex formation pressure system and diverse fluid components during deepwater deep drilling make it easy for gas intrusion accidents to occur. dissolution suspension of the intruded in difference between gas–liquid phase distribution characteristics gas–water two-phase flow wellbore lead errors calculation overflow assessment after intrusion. In this article, a multiphase model, consideri...

Information transmission is an important part of the wellbore trajectory automatic control system. Combined with the characteristics of the guided drilling system, drilling fluid pulse is selected as a tool for trajectory control. Negative pulse transmission of drilling fluid is one of the key technologies to realize wellbore trajectory automatic control. In this paper, the working principle of...

In this study, a 1-D transient state mechanistic model of cuttings transport with foam in inclined wells has been developed. The model is solved numerically to predict the optimum foam flow rate (liquid and gas rate) and rheological properties that would maximize cuttings transport efficiency in inclined wells. A detailed sensitivity analysis of the effect of gas and liquid flow rates, drilling...

This paper develops mathematical models for a proposed production logging tool, which uses capacitance sensors to measure liquid annulus thickness and liquid type for a primarily gas-carrying wellbore. A semi-analytical method is devised which uses Fourier analysis to account for the complicated system geometry and reduces the problem to singular integral equations over a sensor electrode. Appr...