To solve the problems of low energy efficiency and slow penetration rate drilling, we took geological data adjacent wells, real-time logging data, downhole engineering parameters as inputs; mechanical specific unit footage cost multi-objective optimization functions; machine pump equipment limit constraint condition. A constrained Bayesian algorithm model was established for solution, drilling ...

The challenges created by HPHT conditions make drilling and cementing difficult. overwhelming challenge stands for materials used wells operated at higher temperature pressures in the face of producing downhole. There is need better choice cement operations during development production wells. review method adopted this article considering Calcium Oxide which poses as good expander. In paper, a...

The derivation of a conventional error model for the miniature gyroscope-based measurement while drilling (MGWD) system is based on the assumption that the errors of attitude are small enough so that the direction cosine matrix (DCM) can be approximated or simplified by the errors of small-angle attitude. However, the simplification of the DCM would introduce errors to the navigation solutions ...

Abstract Drilling and sampling are the most direct effective methods available to study Antarctic subglacial lakes. Based on Philberth probe, a Recoverable Autonomous Sonde (RECAS) allows for in situ lake water measurement sampling, through addition of an upper thermal tip cable recoiling mechanism. RECAS-200, prototype RECAS, has drilling depth 200 m, surface supply voltage 800 VAC downhole po...

Abstract The longitudinal vibration of the bottom drill string is violent and law complex during deep well drilling. brings many adverse effects on drilling pipe fracture bit trampoling. Generally speaking, effective way to control install damping device in hole. research group proposes a that uses energy modulate impact dynamic load, which converts downhole not conducive into mechanical improv...

Due to complex working conditions and cuttings migration mechanism other factors, bed is easy form in deviated well section extended reach horizontal section, too high cause a series of downhole accidents, such as bit mud bag, wall collapse, stuck drilling holding drilling. The borehole cleaning evaluation system based on weighing can collect the returned real time. combines real-time flow rate...

A laboratory-based experimental study was conducted to more completely understand the fundamentals of pressure transients produced by Formation Testing While Drilling (FTWD) equipment. These tools can be run in open hole, positioned at a desired level, and actuated to measure reservoir pressure and flow capacity while in a dynamic drilling environment. Any number of pressure measurements can be...

A modelling effort was made to try to predict the life of downhole tubes or casings, synthetically considering the effect of service influencing factors on corrosion rate. Based on the discussed corrosion mechanism and corrosion processes of downhole tubes, a mathematic model was established. For downhole tubes, the influencing factors are environmental parameters and stress, which vary with se...