Talk:Measurement while drilling
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[edit] Merge Mud pulse telemetry article into the Mud Pulse Telemetry section
While "pulse telemetry" could possibly be used in other applications, I cannot think of another application for "Mud Pulse Telemetry" outside of its use in drilling. Accordingly, I suggest merging the Mud pulse telemetry article into the Mud Pulse Telemetry section of Measurement While Drilling and redirecting Mud pulse telemetry to Measurement While Drilling#Mud Pulse Telemetry --TRosenbaum 13:52, 8 February 2007 (UTC)
Concur completely.axharr 2 April 2007
Agreed - also cannot think of another MPT application outside of MWD/drilling operations--Oilfieldtiger 19:49, 31 July 2007 (UTC)
Agree - have been in the business for years, never heard of MPT outside of an oil well Porphyrula 15:48, 27 September 2007 (UTC)
(This is not necessarily true. A "Slim Tool" can be as non-retrievable as a "Fat Tool". Put a stabilizer on top of the monel holding the tool. Put centralizers on the tool itself, which happens on collars larger than 6 3/4. How about one of the two part slim tools? ) I just moved this text from the main page, apparently some people don't know about the discussion page.
[edit] Cost of MWD
In the directional information section of this article MWD is referred to as High tech electronics and that they are not generally used on vertical sections were cheaper multishot or wireline logging is used This is not strictly true, For a start MWD services are one of the most basic services offered by many MWD service companies (baker, halliburton etc) and are used almost always throughout the well with the exception of tophole (initial hole opening), even then are used on a regular basis. the only case in which they aren't used are during anti collision operations when the close proximity of other wells can cause magnetic interference with the magnetic survey tools. in this case gyroscopes are used instead. multishot and single shot are very rarely used (at least in mature fields such as the gulf of mexico and the north sea). I also feel that seperating MWD and LWD is not necessary as many companies now offer the MWD (surveying) and the LWD in one package with the same engineer running both. it has been a long time since these were seperate services within a company. terminology as probably lent to this confusion as most engineers running the equipment will refer to themselves as MWD or LWD when in fact they are both. BAsic service packages can be directional only but it is often (what i will refer to as) an MLWD engineer running it. Mwd could be very broadly termed as realtime wirelining with difference being that the bandwidth available to send data is a lot smaller, due to the difference in transmission systems between wireline and MWD, and the sensors run being a lot less sensitive due to the fact that MWD sensors scrifice sensitivity for ruggedness (due to the logging occouring during drilling). In fact, in general throughout articles to do with MWD, LWD and directional Drilling, i note a lot of instances were the technology referred to as being current is generally 10 - 15 years out of date. for example MLWD and directional drilling are often (in the case of rotary steerable systems) are sold as a package from the same company due to the interface between rotary steerables and MLWD systems being specific to a company (i.e seperate companies MLWD and rotary steerable are incompatible), and also because the rotary steerable will generally use the MLWD in order to communicate with and receive commands from the surface. also it tends to be the MLWD engineer who programs the rotary steerable tool Could we maybe change some of the article to reflect this information?
[edit] MWD Pressure Sensors Hammer Union
Hammer-Union Pressure transmitter, can be easily repaired or replaced on location,has improved the accuracy and response time for mud-pulse communications used in most directional-drilling operations. This sensor, which measures the hydraulic and pressure characteristics of the drilling fluid, plays a pivotal role in communicating with downhole measurement-while-drilling (MWD) tools. The oil and gas industry has measured static drilling mud pressure using a bonded, strain-gauge type of pressure sensor that incorporates a diaphragm that is integral to the machined WECO front end. For safety reasons, a special fitting has been incorporated as part of the sensor. This fitting, also known as WECO or wing union. —Preceding unsigned comment added by 219.64.11.35 (talk) 06:55, 3 April 2008 (UTC)
[edit] Drilling mechanics information
MWD tools can also provide information about the conditions at the drill bit. This may include:
Rotational speed of the drillstring Smoothness of that rotation Type and severity of any vibration downhole Downhole temperature Torque and Weight on Bit, measured near the drill bit Mud flow volume
May as well add: Down hole mud Pressure (internal & Annular pressure)
Haytem A.F 00:20, 24 April 2008 (UTC)
