The increasing global energy demand has pushed the oil industry towards developing more innovative and advanced methods of enhancing oil recovery even under unfavourable technical and environmental conditions. The severity of many operational problems affecting the drilling and production of oil and gas wells is worsened by inaccessibility; hence, remedial efforts must be implemented from afar....

Abstract Small-size at-bit azimuthal gamma geosteering tool is an important used in the process of old well sidetracking. It significant to carry out numerical simulation analysis erosion and life prediction reduce development costs excavate remaining reservoir wells. By using finite element software, we calculate analyze characteristic drilling fluid flow sand content ratio tool. These results...

Abstract As an advanced downhole instrument in drilling engineering, fluid continuous wave generator (DFCWG) has great application prospects. The large load torque is one of the key problems that hinder development DFCWG. In this paper, based on design theory rotary valve and finite element method, structure designed characteristics analyzed points out strong alternating characteristics. It poi...

Increased production from gas lifted oil wells can be achieved by use of feedback control. Without control the well system may have large oscillations in the flow rate or stabilize itself at a non-optimal production point. These non-optimal production conditions give lower production and/or poor oil/water downstream separation. The study extends the newly introduced approach for controlling gas...

The longitudinal vibration of the drill pipe contains considerable energy which can be used to improve rock-breaking efficiency during drilling. It is very important development drilling speed-up tools have a comprehensive understanding conversion downhole string vibration. In this paper, characteristics bit load and under different conditions were studied in experiment, analysis method from sp...

The drilling process is complex because unexpected situations may occur at any time. Furthermore, the system extremely long and slender, therefore prone to vibrations often being dominated by transient periods. Adding fact that measurements are not well distributed along system, with majority of real-time only available top side having access very sparse data from downhole, poorly observed maki...

Weak signal detection is very important in the downhole acoustic telemetry system. This paper introduces the Duffing oscillator weak signal detection method for the downhole acoustic telemetry systems. First, by solving the Duffing equation, analyzed the dynamics characteristic of Duffing oscillator and weak signal detection principle; and then on this basis, built Duffing oscillator circuit ba...