The Use of Weight on Bit, Torque, and Temperature To Enhance Drilling Efficiency (1983)

The Use of Weight on Bit, Torque, and Temperature To Enhance Drilling Efficiency G.E. Guillen G.E. Guillen The Analysts/Schlumberger Search for other works by this author on: This Site Google Scholar Paper presented at the SPE Annual Technical Conference and Exhibition, San Francisco, California, October 1983. Paper Number: SPE-12165-MS https://doi.org/10.2118/12165-MS Published: October 05 1983 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Get Permissions Search Site Citation Guillen, G.E. "The Use of Weight on Bit, Torque, and Temperature To Enhance Drilling Efficiency." Paper presented at the SPE Annual Technical Conference and Exhibition, San Francisco, California, October 1983. doi: https://doi.org/10.2118/12165-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Annual Technical Conference and Exhibition Search Advanced Search Members SPE-AIMEAbstractToday, most drilling efficiency decisions are based on models describing downhole drilling conditions. The inputs to these models have in the past been a collection of surface measurements. Measurements While Drilling (MWD)provides realtime information from near the bit and allows for a more comprehensive understanding of downhole drilling conditions. Downhole measurements can help eliminate uncertainties in the behavior of the drilling system, and provide a more scientific approach to improving drilling efficiency.The downhole drilling measurements include: weight on bit and torque measured by strain gauges set in a drill collar; temperature measured by a sensor on the outside of the collar; and mud flow rate interpreted from the MWD alternator output. Comparison of these measurements with surface data reveals previously unexpected trends that can help diagnose problems. The interrelationships among these measurements lead to a better understanding of the drilling process, and can help make immediate decisions concerning drillstring washouts, bit balling, packed off drilling assemblies, severe dog legs, the overloading of polycrystalline diamond compact bits, and the pulling of worn bits, resulting in direct savings of rig time.IntroductionThe interpretation of downhole drilling parameters from surface measurements has been parameters from surface measurements has been the subject of many studies. Many theoretical explanations about the transmission of mechanical forces and stresses to the bottom of the hole have been presented. It becomes obvious rather quickly that the drilling process is very complex and requires a large data set to understand cause and effect relationships.Until the development of the Measurements While Drilling system, it was impossible to substantiate these theories with actual downhole drilling measurements. MWD tools allow the measurement and transmission to surface in realtime, of some important drilling parameters that allow a better understanding of the conditions downhole. Many interesting cases have been seen since the introduction of these systems.DESCRIPTION OF THE SYSTEMThe MWD tool is housed in a non-magnetic drill collar that contains an electronic cartridge and sensors that make the different measurements. Data are encoded in binary form and sent to the surface via the mud stream on a modulated continuous fixed-frequency pressure wave; this telemetry system has proven its reliability in nearly three years of commercial application.At the surface, differential pressure transducers installed in the standpipe detect pressure fluctuations generated by the downhole pressure fluctuations generated by the downhole tool. These pressure tranducers are connected to a computer that decodes the data, drives the printers, records the data on magnetic tape and printers, records the data on magnetic tape and plots a log of the data in realtime. plots a log of the data in realtime. The power to operate the downhole system is obtained from the mud flow by means of a turbine driven alternator generating a voltage that is proportional to the flow rate. This voltage is proportional to the flow rate. This voltage is measured and transmitted to the surface as a part of the systems check.The MWD system has a variety, of applications depending on the nature of the well and the specific problem that is being addressed. Keywords: application, mwd system, surface measurement, rop, drilling condition, drilling operation, optimization, downhole torque, gamma ray, penetration rate Subjects: Drilling Operations This content is only available via PDF. 1983. Society of Petroleum Engineers You can access this article if you purchase or spend a download.