HP Forum Archive 18

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HP-41C LOG PAC Message #1 Posted by Muhammad Ahmad on 1 Sept 2008, 10:04 a.m. I recently got this LOG PAC module with calculator. Does anybody know what it is and if there is a manual out there for it? Catalog shows it as LOGGING PAC. I have searched and did not get anywhere. Any suggestions and ideas would be appreciated. P.S. HOW CAN I ADD AN IMAGE TO MY POSTING HERE? Thanks

Re: HP-41C LOG PAC Message #2 Posted by Karl Schneider on 1 Sept 2008, 5:44 p.m., in response to message #1 by Muhammad Ahmad Quote: P.S. HOW CAN I ADD AN IMAGE TO MY POSTING HERE? Visit the "advanced formatting techniques" link shown at the top of the index. -- KS Edited: 1 Sept 2008, 6:32 p.m.

Re: HP-41C LOG PAC Message #3 Posted by Muhammad Ahmad on 1 Sept 2008, 6:53 p.m., in response to message #2 by Karl Schneider This is only to point to an image that is on the web. What about just posting an image in the message if there is no web link? Thanks

Re: HP-41C LOG PAC Message #4 Posted by Karl Schneider on 1 Sept 2008, 7:01 p.m., in response to message #3 by Muhammad Ahmad Quote: This is only to point to an image that is on the web. What about just posting an image in the message if there is no web link? Muhammad -- Pasting an image into the posts is not supported, due to concerns of bandwidth requirements for both the MoHPC host (note the absence of advertisements), and users who might not have broadband. MoHPC will host some images, within limits. -- KS

Re: HP-41C LOG PAC Message #5 Posted by Egan Ford on 1 Sept 2008, 7:13 p.m., in response to message #3 by Muhammad Ahmad Quote: This is only to point to an image that is on the web. What about just posting an image in the message if there is no web link? Go to: http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/guestfm.cgi Upload your image. Right click/copy on your image name to get URL. Create/edit post. Paste that as URL after clicking the Image button.

Re: HP-41C LOG PAC Message #6 Posted by Walter B on 2 Sept 2008, 2:43 a.m., in response to message #3 by Muhammad Ahmad Anyway, you need a Guest Directory first :) Ask Dave (the webmaster and forum host) to give you the necessary space.

Re: HP-41C LOG PAC Message #7 Posted by Jim Creybohm on 2 Sept 2008, 9:31 a.m., in response to message #1 by Muhammad Ahmad If I recall correctly, I think one of the major service companies like Schlumberger or Halliburton released a logging pack for the oil business. A logging tool is a tool lowered to the bottom of the well via a wireline and then turned on and the for example, potential difference measured between the upper and lower ends of the tool. A depth vs <measurement> result would be printed. There weren't a lot made if I remember correctly as they were rather specific and fairly high end in terms of price. I didn't get to play with this pac as it was the realm of geologists. If you can do a Cat listing and publish the results, I may be better able to help you.

Re: HP-41C LOG PAC Message #8 Posted by Juan J on 2 Sept 2008, 5:21 p.m., in response to message #7 by Jim Creybohm Hello, There is an interesting story about and oil company and the HP-41. Back in the mid-1980s a field engineer working for a Canadian oil company wrote an HP-41 program for circulation analysis using coiled tubing. There is a number of flow equations that explain fluid circulation in a wellbore, and the stresses applied to the coiled tubing string need to be considered as well. Given well data, the program could calculate pump flow rates and pressures; a subroutine calculated the effects of forces, stresses and friction on the string. The software worked quite well, and the company tried (unsuccessfully) to get the rights. Since it was his calculator and his program, he refused, and eventually he left the company. A year (and a number of less-than-satisfactory) programs later, he was asked to rejoin the company. Needless to say, his program would be welcome, and there was interest in porting it to a PC. Aware of this, he negotiated his rehiring, and at the same time he agreed to sell the program for a huge sum of money. Eventually the company agreed. The program was ported to DOS and then to Windows, and continues to be used for circulation and tubing forces analysis. The company merged with another company some time ago; the engineer (and his 41) left the company shortly thereafter, and is self-employed.

Re: HP-41C LOG PAC Message #9 Posted by Jim Creybohm on 2 Sept 2008, 6:07 p.m., in response to message #8 by Juan J Interesting story Juan! I knew some engineers in Calgary around that time (the oil patch was a fairly small community). The only company that I remember that developed anything in that time was Fracmaster. I don't know that they were into coiled tubing fracs in the mid 80's though. They seemed to be more focused on losing money in Russia. As a 41 user, I would be interested in reading this story to see if my faulty memory could piece any of the players together. Can you find a link for this? Just a personal question; are you an oilpatch guy? In Canada?

Re: HP-41C LOG PAC Message #10 Posted by Juan J on 3 Sept 2008, 11:35 p.m., in response to message #9 by Jim Creybohm Hello Jim, Two companies were working at te time, Nowsco and Fracmaster. You are right, Fracmaster was losing money in Russia and was eventually bought by BJ Services back in 1999. There was a lot to do to make Fracmaster profitable again, and some interesting stories. The other company, Nowsco, also merged with BJ in 1996, focused on Coiled tubing and fracturing; it had a good market share in Canada and some state-of-the-art technology badly needed by BJ, including the circulation analysis software. Data acquisiton and e-mail software was also on BJ's list, but that is another story. I knew one of the Windows developers, Bill Aitken, who was part of the team that ported the HP-41 into Borland C++. Do you know him? As for links, most of these events predate the Web, but I think it is possible to look around. About your question, yes, I am an oilpatch guy, and check your mail for some more details. Juan

Re: HP-41C LOG PAC Message #11 Posted by Muhammad Ahmad on 4 Sept 2008, 11:27 p.m., in response to message #7 by Jim Creybohm Here is the CAT 2 listing for LOG PAC: PR PLOT1 REV LOAD CLCAR SSL STC MAGDEC OUPUT YDCOST TALHOLD GUYLINE TAILTR COMPARE FSAP RIGGING LINES ABNEY LOAD1 DEFL M TENS 1 LENGTH SINH ELLIP NEW D NEW Y X DEFL TAIL SKYLEN MOBILITY ASD LOGWT JACK PNV-P PV-INP P/F-INP CHS P/A-INP N2 AMT STRG CK-INP CK-1 CK-2 RUN SORT P/F CMP P/A CMP SUM SUMRY ALTX EAW Let me know if these ring a bell. Thanks Edited: 4 Sept 2008, 11:28 p.m.

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