This paper describes the investigation of a single-well enhanced geothermal system comprised of a downhole thermosiphon and a novel completion design using a downhole heat exchanger. The thermosiphon is a device that takes advantage of the gravity head difference between liquid flowing down the annulus and vapor flowing up the tubing. Without a connection to a large reservoir volume, a downhole...

Ultrashort-Radius Horizontal Well (URHW) drilling engineering plays an important role in increasing the recovery factor of old oilfields. By sidetracking wellbores at a very high build-up rate, URHW can effectively exploit residual oil near wellbores. Currently, main problem faced is reduced torque received by drill bits owing to increased friction between flexible assembly and wellbore as hori...

This is a summary of state of the art horizontal well technology and a review of the economic benefits of horizontal wells. The paper describes various reservoir applications of horizontal wells from primary recovery to EOR applications. The paper includes field examples of different applications. . Although horizontal wells have been drilled as early as 1927, the major thrust of drilling horiz...

Understanding the structure and mineralogical composition of a region is an essential step in mining, both during exploration (before mining) mining process. During exploration, sparse but high-quality data are gathered to assess overall orebody. process, boundary positions material properties refined as mine progresses. This refinement facilitated through drilling, logging, chemical assaying. ...

An automated drilling system requires a real-time evaluation of the bit during to optimize operation and determine when stop switch bits. Furthermore, in dynamic modeling drill strings, it is necessary take into account interactions between bits rock. To address this challenge, hybrid approach that combines physics-based models with data analytics has been developed handle downhole measurements...

The heat transfer characteristics of a downhole heat exchanger (DHE) were studied experimentally in a laboratory scale. The permeable aquifer was simulated by using a rectangular tank filled with glass beads of diameter ranging from 3 to 5 mm. The downhole heat exchanger was modeled by a Ushaped copper tube. We have simulated various configurations of DHE by changing the geometrical parameters ...

This paper treats stabilization of multiphase flow in a gas lifted oil well. Two different controllers are investigated, PI control using the estimated downhole pressure in the well, and nonlinear model based control of the total mass in the system. Both control structures rely on the use of a state estimator, and are able to stabilize the well flow with or without a downhole pressure measureme...

An automatic technique is developed for integrating two electrical resistivity logs obtained during Leg 133, namely, the deep induction log (ILD) and the spherically focussed log (SFL). These logs are routinely run by the Ocean Drilling Program in lower resistivity sedimentary environments, where drilling through soft, poorly consolidated lithologies often results in variable hole diameters. Ex...