Development of Inflow Profiling Criteria for Low-Rate Horizontal Wells on the Basis of Physical Lab Experiments and Field Studies

2010 ◽  
Author(s):  
Rim Valiullin ◽  
Rashid Yarullin ◽  
Ayrat Yarullin ◽  
Valery Shako ◽  
Anton Vladimirovich Parshin
Keyword(s):  
Horizontal Wells ◽  
Field Studies ◽  
Lab Experiments ◽  
Low Rate

Against the Grain: Three Proppant Delivery Approaches That Buck the Status Quo

2021 ◽  
Vol 73 (01) ◽  
pp. 28-31
Author(s):  
Trent Jacobs
Keyword(s):  
Open Fracture ◽  
Horizontal Wells ◽  
Field Studies ◽  
Technical Conference ◽  
Oil Field ◽  
Permian Basin ◽  
Artificial Lift ◽  
Fracture Area ◽  
The Status ◽  
Conventional Oil

Pumping proppant down a wellbore is the easy part. Ensuring that the precious material does its job is another matter. A trio of field studies recently presented at the 2020 SPE Annual Technical Conference and Exhibition (ATCE) highlight in different ways how emerging technology and old-fashioned problem solving are moving the industry needle on proppant and conductivity control. These examples include the adoption of unconventional completion techniques in a conventional oil field in Russia and work to validate the use of small amounts of ceramic proppant in North Dakota’s tight-oil formations. Both studies seek to counter widely held assumptions about proppant conductivity. A third study details a recently developed chemical coating that Permian Basin producers are applying “on the fly” to sand before it is pumped downhole. The new adhesive material has found a niche in helping operators mitigate the amount of sand that returns to surface during flowback, a sectorwide issue that drives up completion costs and later may spell trouble for artificial lift systems. Disproving “The Overflush Paradigm” After conventional reservoirs are hydraulically fractured, both from vertical and horizontal wells, it has been standard practice for decades to treat the newly propped perforations with a gentle touch. The approach to this end is known as underflushing. When underflushing, the goal is to leave behind just a few barrels’ worth of proppant-laden slurry over the perforations before attempting to complete further stages. The motivation for this boils down to the need for an insurance policy against displacing the near-wellbore proppant pack and causing the open fracture face to pinch off before it ever has a chance to transmit hydrocarbons. Such carefulness comes at a price. Underflushing raises the risk of needing a cleanout before oil can flow optimally to surface. This not only delays the arrival of first oil, it means extra equipment and personnel are required. However, a more glaring downside to underflushing is that it appears to be an unnecessary precaution. The near-wellbore fracture area is, in fact, more robust than what conventional wisdom allows credit for.

Identification of Inflow Zones in Low-Rate Horizontal Wells by Spectral Noise Logging (Russian)

2017 ◽  
Author(s):  
I. Y. Aslanyan ◽  
R. N. Minakhmetova ◽  
V. G. Pimatyev ◽  
A. A. Kozlov ◽  
A. G. Kuznetsova
Keyword(s):  
Horizontal Wells ◽  
Low Rate

scholarly journals Imazapyr Applied Postemergence in Sunflower (Helianthus annuus) for Broomrape (Orobanche cernua) Control

1995 ◽  
Vol 9 (4) ◽  
pp. 819-824 ◽  
Author(s):  
Luis Garcia-Torres ◽  
Mercedes Castejon-Muñoz ◽  
Francisca Lopez-Granados ◽  
Montserrat Jurado-Exposito
Keyword(s):  
Field Studies ◽  
Effective Control ◽  
Time Interval ◽  
Growth Stages ◽  
Head Diameter ◽  
Small Nodule ◽  
Shoot Bud ◽  
Herbicide Treatments ◽  
Crop Growth Stages ◽  
Low Rate

Field studies were conducted from 1991 through 1994 in several locations of Southern Spain to determine the efficacy of imazapyr as late postemergence application in sunflower for broomrape control and the crop response to this herbicide under weed-free conditions. Single applications of imazapyr at 10 to 15 g/ha on sunflower plants at about theV12(12 leaves) toV19(19 leaves) growth stages, infected with broomrape plants at the predominant growth stages “c” (small nodule with shoot bud visible) and “d” (shoot bud and roots well developed), resulted in effective control without damaging the crop. Double applications of imazapyr at 10 + 10 g/ha at about the same crop growth stages V12 to V19, at a time interval of 12 to 14 d between single applications, were also efficacious and well tolerated by the crop. The same herbicide treatments applied to weed-free sunflower did not adversely affect the biomass, head diameter or yield of the crop as compared with the nontreated check. As a result of the low rate of imazapyr required for broomrape control, the herbicide treatments are economical (about $3 to $6/ha), non-residual and not affected by the type of soil texture and rainfall conditions.

Common Lambsquarters (Chenopodium album) Control in Corn (Zea mays) with Postemergence Herbicides and Cultivation

1995 ◽  
Vol 9 (4) ◽  
pp. 728-735 ◽  
Author(s):  
Robert J. Parks ◽  
William S. Curran ◽  
Gregory W. Roth ◽  
Nathan L. Hartwig ◽  
Dennis D. Calvin
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Control Strategies ◽  
Chenopodium Album ◽  
Field Studies ◽  
Alternative Control ◽  
Common Lambsquarters ◽  
Postemergence Herbicides ◽  
Weed Emergence ◽  
Low Rate

Greenhouse studies assessed the susceptibility of three common lambsquarters biotypes to foliar-applied bromoxynil, dicamba, and thifensulfuron. Field studies evaluated the effectiveness of the same herbicides in conjunction with atrazine and row cultivation for the control of common lambsquarters in corn. In the field, bromoxynil was applied at 140, 280, and 420 g/ha, dicamba at 140, 280, and 560 g/ha, and thifensulfuron at 2, 3, and 4 g/ha. In the greenhouse, bromoxynil and thifensulfuron reduced common lambsquarters growth by at least 55%, while dicamba reduced growth 45% or less. Two of the three biotypes were resistant to atrazine. In the field, weed control was up to 70% better in cultivated plots than in noncultivated plots. Cultivation sometimes promoted additional weed emergence, but later emerging weeds rarely reached reproductive maturity. Atrazine improved the level of weed control only if triazine-susceptible weeds were present. The lowest rates of bromoxynil and dicamba (140 g/ha) controlled common lambsquarters 85% or greater even without cultivation, whereas control with the low rate of thifensulfuron (2 g/ha) was acceptable (greater than 85%) 8 wk after planting only in combination with cultivation. Combinations of reduced herbicide rates and mechanical cultivation provided effective, alternative control strategies for both triazine-resistant and susceptible common lambsquarters.

Preemergence Broadleaf Weed Control and Crop Tolerance in Imidazolinone-Resistant and -Susceptible Corn (Zea mays)

1997 ◽  
Vol 11 (1) ◽  
pp. 118-122 ◽  
Author(s):  
Christy L. Sprague ◽  
Edward W. Stoller ◽  
Stephen E. Hart
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Field Studies ◽  
Susceptible Variety ◽  
Common Lambsquarters ◽  
Crop Tolerance ◽  
Herbicide Treatments ◽  
Ac 263,222 ◽  
Low Rate

Field studies were conducted in 1994 and 1995 at Dekalb and Urbana, IL, to evaluate preemergence broadleaf weed control and crop tolerance in imidazolinone resistant (IR) and susceptible (non-IR) corn using atrazine, imazethapyr, AC 263,222, CGA-152005, MON 12000 with and without MON 13900 (a safener), and flumetsulam + clopyralid. When sufficient rainfall occurred within 28 d of application to insure herbicide absorption, the IR corn variety was more tolerant than the susceptible variety to imazethapyr, AC 263,222, CGA-152005 at 40 and 80 g/ha, and MON 12000 with and without MON 13900. Overall crop tolerance of IR corn was equal to that of corn treated with atrazine for all herbicide treatments except CGA-152005, which injured IR corn. Control of velvetleaf, common lambsquarters, Pennsylvania smartweed, tall morningglory, and jimsonweed for all herbicide treatments was equal or superior to that of atrazine at 1.7 kg/ha. However, control of common cocklebur was significantly greater with atrazine compared to imazethapyr and the low rate of CGA-152005.

Round-pot feeder: low-cost apparatus for field studies on food supplementation for arboreal small mammals

Mammalia ◽  
2017 ◽  
Vol 82 (1) ◽  
Author(s):  
André Faria Mendonça ◽  
Thaiz Armond ◽  
Anna Carla L. Camargo ◽  
Priscilla L. Zangrandi ◽  
Emerson M. Vieira
Keyword(s):  
Small Mammals ◽  
Small Mammal ◽  
Climatic Condition ◽  
Low Cost ◽  
Field Studies ◽  
Food Supplementation ◽  
Bottom Up ◽  
Central Brazil ◽  
Low Rate

AbstractWe describe a newly developed and low-cost feeder designed for use with arboreal small mammals under any climatic condition. As part of a project on bottom-up regulation of small mammal populations in central Brazil, we present the results of 16 months of food supplementation. During the study, more than 118 kg of milled cat food were consumed, out of a total of 207 kg offered. Moreover, we registered a low rate of loss (14.05%) of feeders from falling to the ground or termite/ant colonization. The round-pot feeder described here represents a low-cost method for providing continuous food-supplementation, contraceptives, or poisoned baits to arboreal small mammals.

scholarly journals Open-Ended Attributions in Team Competition

1982 ◽  
Vol 4 (2) ◽  
pp. 159-169 ◽  
Author(s):  
Diane L. Gill ◽  
M. Karen Ruder ◽  
John B. Gross
Keyword(s):  
Task Difficulty ◽  
Causal Explanation ◽  
Field Studies ◽  
The Self ◽  
Locus Of Causality ◽  
Causal Explanations ◽  
Loglinear Analysis ◽  
Lab Experiments ◽  
Loss Effect ◽  
And Task

A total of 352 open-ended attributions were obtained in two field studies with volleyball teams and in two lab experiments, all involving team competition. All attributions were classified along the three causal dimensions of locus of causality, stability, and controllability. Attributions were also classified as referring to the self, to teammates, to the team as a whole, or to other factors and sorted into specific categories. A loglinear analysis revealed that attributions were predominantly internal, unstable, and controllable. A significant win/loss effect reflected the tendency for members of winning teams to use controllable, and particularly unstable, controllable, attributions more than members of losing teams. Overwhelmingly, attributions referred to the team as a whole rather than to individuals or other factors, and teamwork was an especially popular causal explanation. The findings suggest that research on attributions in team competition should focus on causal dimensions rather than the four traditional attributions of effort, ability, luck, and task difficulty, and that further attention should be given to team-referent causal explanations.

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