Services
Precedent’s MPD oilfield service equipmenthas been designed with modularization and miniaturization, making it suitablefor both offshore rigs and onshore drilling operations. Its core components—thechoke manifold, electronic control system, and software control system—arebenchmarked against world-class brands such as Halliburton and Weatherford.Major components are sourced from American brands. Notably, the high-precisionmass flow meter integrated within the choke skid remains fully operationalunder extreme conditions with gas content up to 30% in the fluid, representingthe most advanced configuration among comparable imported products. The MPDelectronic control system employs a dual-redundant DCS architecture, featuringredundant control networks, controllers, and power supply modules. In the eventof a fault, it enables bumpless automatic switchover, ensuring continuous andstable system operation.
The Precedent MPD control system software,developed jointly by Chinese and American experts, features two control modes:Constant Bottomhole Pressure (CBHP) and Micro-Flow Control (MFC). The softwareintegrates surface pressure control, a real-time hydraulic parameter modelingsystem (with a calculation error within 29psi), monitoring, and automaticcontrol functions, fully achieving intelligent control across the entireprocess. This system enables MPD throughout all drilling operations, includingdrilling, making connections, tripping in/out, and replacing packing elements.The MPD software control system automatically adjusts the choke valve atmillisecond-level speeds to increase or decrease wellhead pressure, maintainingit within the preset range and ensuring stable bottomhole pressure.
The MPD software system offers multiple controlmodes, including bottomhole pressure control, wellhead pressure control,standpipe pressure control, micro-flow control, weighted mud displacement,automatic pressure tracking, predictive modeling, emergency response measures,and manual/auto integrated operation. The system supports data input from mudlogging and PWD (Pressure While Drilling) systems, enabling real-timeacquisition of downhole parameters for dynamic correction of the hydraulicmodel. This effectively enhances the accuracy of hydraulic model calculationsand provides reliable data for MPD decision-making. Additionally, the softwarecan display in real time the wellbore structure and corresponding pressuredistribution, and features a three‑pressure profile visualization function,assisting engineers in gaining a comprehensive understanding of downholeconditions.
