#Vdoorlocksmith

#Vdoorlocksmith Show with Junichi Sugiura, Vice President of Sanvean Technologies. He will be delivering a technical presentation titled, “Measurement of Mud Motor Back-drive Dynamics, Associated Risks and Mitigation Measures.” Junichi has been recognized as a distinguished member, lecturer, and award winner of SPE because of his excellent work and extensive contributions to the organization over the last decade.
Brought to you by AI Driller.
00:58 - David Gibson (DG): Welcomes everyone to the show.
3:25 - DG: Gives audience shoutouts.
4:08 - DG: Gives a shoutout and thanks to the sponsor of the show, AI Driller. Asks viewers to put in #aidriller and plays a video clip from sponsor.
6:12 - DG: Introduces the guest, Mr. Junichi Sugiura.
9:05 - JS: Gives a little background on himself including being a Chartered Engineer and Fellow of the Energy Institute.
10:30 - JS: Displays the agenda for today’s presentation including defining Mud Motor Dynamics, downhole instrumentation, and 5 field examples, and mitigation measures.
11:57 - JS: Shows pictures of several downhole sensors.
14:19 - JS: Shares that the company Sanvean Technologies was started in 2015 to develop downhole tools. You must have sensors to understand how your tool is working.
16:37 - JS: Presents Field Example #1 - Instrumented Motor with a “Puck” sensor in the bit box, a “Cigar” sensor in the rotor catch, and another “Puck” sensor in the top sub. Gives an overview of all the data that was recovered during 4 days of recording downhole.
20:43 - JS: Zooms in on a select piece of data from 8 hours. Reviews the results of Bit box RPM, Drill string RPM, and Motor Pressure.
27:32 - JS: Goes back and describes the sequence of events that occurred in example #1. References an older SPE paper from 1992, another well-known phenomenon.
29:55 - JS: Explains the phenomenon of Angular Velocity Dependent Torque and Alternative Theories. Covers various possible explanations such as BHA ballooning.
35:29 - JS: Describes two possible consequences in a steerable motor or motor-assist RSS BHA. #1 being the motor is powerful enough to drive the drill string backward and #2 being that the motor micro stalls and gets stuck.
38:50 - DG: Reads audience questions and comments.
45:02 - JS: Presents Field Example #2 High Bit RPM Reduction Case. Shows a slide of the overview of drilling dynamics over a 4 day period in the Midland Basin. Compares Bit Box rotation speed to Top Sub rotation speed. Zooms in on 17-hour interval and shows where rotation drilling is occurring versus slide drilling.
50:30 - JS: Explains the effective RPM reduction in %.
52:55 - JS: Discusses the few events where the bit comes to a complete stop while sliding. References a previous study from 2015. Shares that this type of situation can also cause motor fatigue, backoffs, and twist offs.
54:47 - JS: Discusses tool face control anomalies. References another paper by Matt Isbell and his team from 2022.
58:47 - DG: Reads audience questions and comments.
1:02:10 - JS: Begins presenting Field Example #3 - Limit Cycle Case with 1000Hz In-bit Data. Reminds us that in the first two examples, MWD and mud pulser are causing the issues. In this third example, the bit sticking and back-drive dynamics are self-sustained.
1:06:06 - JS: Zooms in on the graph to approximately 3,000 ft into the Yates formation in W Texas. Mentions there is a shorter depth therefore the oscillation frequency is high.
1:08:30 - JS: Shows a graph comparing the drill string to the drill bit in 2023 and further discusses the drill string rotating backwards when the bit gets stuck.
1:12:49 - JS: Displays Downhole Torque Scale Example to demonstrate the relative amount of torque required to rotate a bit forward and backward.
1:14:25 - JS: Discusses SPE paper 151248 and the Stockhausen effect. Because of improvement in technology, there is high frequency continuous recording.
1:17:14 - DG: Reads audience comments.
1:19:21 - JS: Presents example #4 High Magnitude Back-drive Case. Discusses various sensors that were deployed to truly understand what was going on downhole. This was the first time they realized that the motor back-drive dynamics travels through the drill string and can be amplified even further up.
1:23:28 - JS: Discusses the example in depth as well as stick slip severity and the fact that it can vary all along the drill string.
1:25:44 - JS: Presents example #5 on the Motor Back Drive Mitigation Tool. After a brief explanation, he displays a graph of two wells in N Dakota to differentiate a conventional BHA vs. BHA using mitigation tool. Using the tool showed increased ROP.
1:29:19 - JS: References three helpful SPE papers where you can find information and updates related to his presentation including bit and BHA damage and forensics.
1:38:10 - JS: Reviews all potential mitigation measures one can take and summarizes his presentation.