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Offshore Drilling and Completion
Published in Shashi Shekhar Prasad Singh, Jatin R. Agarwal, Nag Mani, Offshore Operations and Engineering, 2019
Shashi Shekhar Prasad Singh, Jatin R. Agarwal, Nag Mani
For wireline logging, we had to stop the drilling process, put the drill pipe on slip, break out Kelly, lower the wireline tool, retrieve the tool, read the survey, and plan further action. These increase the non-productive time (NPT), and in offshore, as the day rates are much higher than the onshore rigs, NPT results in huge amount of loss to the company. Therefore, to supplement this issue, MWD and LWD are preferred in offshore directional drilling. The MWD tool transmitted the survey reading to surface through the mud stream in the drill pipe. The drilling process was stopped for few minutes and survey readings were obtained in pump off condition. This saved time to a greater extent compared to wireline logging. The transmission of survey data though mud stream was one of the means. Thus, MWD is considered a better option for survey data transmission compared to wireline procedure. MWD was equipped with gamma ray sensor to detect the natural radioactivity and characterize shale presence, gauge to measure annular pressure which are useful in slim hole to determine ECD, and strain gauge to measure weight on bit (WOB) and torque on bit (Figure 3.14).
Rock mass characterization using MWD data and photogrammetry
Published in Christoph Mueller, Winfred Assibey-Bonsu, Ernest Baafi, Christoph Dauber, Chris Doran, Marek Jerzy Jaszczuk, Oleg Nagovitsyn, Mining Goes Digital, 2019
S. Manzoor, S. Liaghat, A. Gustafson, D. Johansson, H. Schunnesson
Measurement while drilling (MWD) is a technique that monitors relevant drill process parameters, which usually include penetration rate, percussive pressure, rotation pressure, feed pressure, damping pressure and flush pressure during the drilling operation. The technique increases the available information about the rock mass and improves the characterization of the rock mass (Khorzoughi, 2013). In particular, MWD technique provides a better description of the hidden volume of the rock mass compared to other exploration methods (Segui & Higgins, 2002). The most important aspect of MWD is that it collects information with reduced time and cost compared to other methods like core drilling or geophysical surveys (Khorzoughi, 2013). The technique was introduced in the oil industry in 1911 to diminish the uncertainties involved in drilling operations and was applied to mining in the 1970s (Segui & Higgins, 2002). Since then, many researchers have applied this technique to improve different mining operations.
Down-Hole Instrumentation Package for Energy Well Drilling
Published in John D. Cressler, H. Alan Mantooth, Extreme Environment Electronics, 2017
In the BP blowout, there was a lot of discussion in the media on the failure of the blowout preventer. However, the blowout preventer is the last hope for a well which is out of control. To control the well while drilling, the driller balances the weight of the drilling mud (drilling fluid) inside the drill string with the expected reservoir pressure. The goal is to have the weight of the drilling mud equal to or great than the reservoir pressure. In short, the driller needs to know the mud pressure and temperature at the drill bit. This type of information is transmitted to the surface using “mud pulse” telemetry from an MWD (measurement while drilling) tool. Mud pulse telemetry creates pressure pulses in the drilling mud by opening/closing a fluid valve located at the drill bit. These pulses are decoded at the surface.
Simulation study of rotor erosion for a continuous-wave pulse generator by computational fluid dynamics
Published in Systems Science & Control Engineering, 2019
Zhidan Yan, Xue Yin, Yongchao Yao, Jianhua Liu, Minmin Liu, Junfei Wang, Zhenyu Yang, Xiang Shi
Efficient and reliable measurement while drilling/logging while drilling (MWD/LWD) technology can effectively enhance geo-steering and stratigraphic evaluation capabilities and improve oil and gas drilling-encounter ratio in oil and gas drilling operations. Drilling fluid pulse, as a key downhole data transmission system in MWD/LWD technology, is a widely used data transmission tool due to its overall reliability, low development cost, and wide application (Hussain, Huelvan, & Adams, 2014; Shen, Huang, & Gao, 2009; Su & Dou, 2005). In particular, continuous-wave drilling fluid pulse with high transmission rates is the frontier development direction of drilling fluid pulse transmission (Hutin, Tennent, & Kashikar, 2001; Ingolf, Detlef, Dang, Hanno, & John, 2008).
A new method for monitoring coal stress while drilling process: theoretical and experimental study
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Yahua Zheng, Zhigang Zhao, Tongbin Zhao, Chengfu Ma, Kai Zhang, Yanshan Qi
A self-designed measurement-while-drilling (MWD) system is used in the Laboratory test (Deoumay, Richard, and Seherd 2008), which is composed of drilling rig, torque-speed sensor, tie rod displacement sensor, data acquisition instrument and data processing and analysis software. The structure and physical diagram of the drilling parameter measurement are shown in Figure 3. The drilling test is performed with a twist drill with a diameter of 10 mm. The MWD system simultaneously monitored drilling parameters such as bit torque, rotation speed, and displacement during drilling.