Zobrazeno 1 - 10
of 134
pro vyhledávání: '"J.F. Lea"'
Publikováno v:
PRX Energy, Vol 3, Iss 2, p 023002 (2024)
Diffusion of Se from the CdSe window layer into the CdTe absorber improves the short circuit current density by narrowing the band gap and increasing the carrier lifetime. Thicker CdSe layers, however, show a dramatic loss in photocurrent collection
Externí odkaz:
https://doaj.org/article/f4b2a4c6be5441c9a1dad144542d5c72
Publikováno v:
SPE Production & Facilities. 10:41-45
The analysis of working loads in a sucker rod string during a pumping cycle has received substantial coverage in the petroleum literature. These load predictions have tended to focus on mechanical design considerations such as excess load and fatigue
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b7da8ec2dc2cb73190a88be332d9381a
https://doi.org/10.2118/25416-pa
https://doi.org/10.2118/25416-pa
Publikováno v:
SPE Computer Applications. 6:9-14
Abstract Beam pumping is the most frequently used artificial lift technique. Down hole pump cards are used to evaluate performance of the pumping unit. Pump cards can be generated from surface dynamometer cards using one-dimensional wave equation wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::855daf178414ba7c19f5aa418d5dbcc3
https://doi.org/10.2118/25420-pa
https://doi.org/10.2118/25420-pa
Autor:
J.F. Lea, J.F. Bowen
Publikováno v:
SPE Production Engineering. 7:113-120
Measurements of nine electrical and mechanical parameters were made on conventional and special-geometry units during operation of beam-pump/sucker rod systems in oil and natural gas wells. All quantities were measured simultaneously and computer-rec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d0f136bacd33b2fb2ad06683e746eb5
https://doi.org/10.2118/18187-pa
https://doi.org/10.2118/18187-pa
Autor:
J.F. Lea
Publikováno v:
SPE Production Engineering. 6:420-426
Summary In previous dynamic predictive models of beam-pump performance, drag forces on the rod string commonly are modeled by an input empirical drag coefficient multiplying the local rod velocity. This paper shows how forces on the rods and pump plu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d362a7d3e19fdfce846964cb9015366e
https://doi.org/10.2118/20672-pa
https://doi.org/10.2118/20672-pa
Publikováno v:
IEEE Transactions on Industry Applications. 26:919-925
Cyclic loads such as eccentric pumping units cause a varying torque on the driver. Determination of the most efficient induction motor for the load is discussed. Ultrahigh-slip motors as well as NEMA (National Electric Manufacturers Association) desi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::76de81cb5885f1267a03be3d0dedb61c
https://doi.org/10.1109/28.60063
https://doi.org/10.1109/28.60063
Publikováno v:
Canadian International Petroleum Conference.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd5a1b5e11f54a9dff61fb03aaaf0572
https://doi.org/10.2118/2004-134
https://doi.org/10.2118/2004-134
Publikováno v:
All Days.
Abstract The following is an update to an earlier paper compiled and presented in April 1991 at the ESP roundtable held in Houston, Texas. This paper contains referenced categories of problems that have been encountered in field operations and the so
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0c29247a62f5ecbf7762e2515a270fa
https://doi.org/10.2118/28694-ms
https://doi.org/10.2118/28694-ms
Publikováno v:
All Days.
Abstract This paper describes the development and use of a Continuous Carbon Fiber Sucker Rod which is in the configuration of a reelable "tape" or "ribbon" with current dimensions of 1.45 in. × 0.212 in. it can be wound on a 10 ft diameter reel, 6
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::725d5974ddc45259dbd990e1113333a9
https://doi.org/10.2118/28523-ms
https://doi.org/10.2118/28523-ms
Autor:
J.F. Lea
Publikováno v:
Journal of Glaciology. 17:355-358
Shreve (1962) evaluated the performance of solid-nose hotpoints of various geometries. A more concise method for analysis of the special case of a flat disc melting into ice is presented here. In contrast to the numerical solution presented by Shreve
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a405f1fbaebdfcc6f5711dfc7d71d896
https://doi.org/10.3189/s0022143000013642
https://doi.org/10.3189/s0022143000013642