Overcoming Extreme Technical and Logistical Challenges to Successfully Cleanout 76,000-LBM Proppant

2021 ◽  
Author(s):  
Steven Craig ◽  
Patcharapun Soodsakorn
Keyword(s):  
Laboratory Testing ◽  
Operating Time ◽  
Pressure Gauge ◽  
Operation Time ◽  
Two Phase ◽  
Coiled Tubing ◽  
Detail Design ◽  
Jet Pumps ◽  
History Of ◽  
Study Laboratory

Abstract A fracture treatment in offshore Tunisia screened out leaving over 76,000-lbm proppant in the wellbore. The well was significantly under-hydrostatic. The platform was small and had limited deck space and low capacity cranes. The completion incorporated chrome tubulars with a history of causing abrasion failure to coiled tubing strings. The challenge was to efficiently and safely clean out the proppant with coiled tubing (CT). A prior cleanout campaign had been conducted with concentric CT and jet pumps. An initial design focused on repeating this method. The engineering analysis had to account for fluid and nitrogen pumping being conducted from a supply vessel, limited nitrogen volume, low the solids return rate due to surface handling limitations, and no fluid discharge permitted to sea. A combined engineering, logistical study, laboratory testing and risk assessment was undertaken over the course of three months. Engineering utilized advanced cleanout modelling software to review concentric CT cleaning, forward cleaning (with and without optimizing cleaning Bottom Hole Assembly (BHA) and with various sizes of CT), and reverse circulating. Logistics analyzed the overall operation time, fluid and nitrogen requirements and the number of boat trips to replenish/change well returns and nitrogen. Three additional challenges were present. First, proppant could have packed off creating difficulties for some of the processes under review. Laboratory testing was conducted and confirmed this would not be a concern. Second, the well was sour and considerations for protecting the CT string and handling hydrogen sulfide (H2S) in the return stream were required. Third, CT string optimization was required to reduce potential abrasion failures. Avoiding CT failure was paramount as the string would be boat spooled onto the platform and any failure would severely impact operating time and project finances. The chosen method was primarily fluid only reverse circulating when cleaning above the formation, changing to forward circulated two phase operation when close to the formation. The downhole pressure gauge in the completion provided early warning of lost returns or of gas kicks. The operation was successfully, efficiently and safely completed in August 2019. The well was handed back to production 8 days ahead of schedule. The paper will cover the complete concept and detail design, execution and post-job analysis.

EFFECT OF OPERATING TIME OF THE WELLS IN THE STEADY DRAINAGE MODE BEFORE STOPPING ON THE RESULTS OF THE STUDY OF PRESSURE BUILD-UP CURVES

2017 ◽  
pp. 48-50
Author(s):  
E. F. Gilfanov
Keyword(s):  
Operating Time ◽  
Previous History ◽  
Operation Time ◽  
Pressure Recovery ◽  
Recovery Curve ◽  
History Of ◽  
Accuracy Of Results ◽  
Theoretical Pressure

Operation time of the well before stopping for investigating the pressure recovery curve in hydrodynamic studies is an important parameter affecting the quality and accuracy of results of research processing. Comparing the actual and theoretical pressure curves and the derivative, it’s possible to eliminate the uncertainty in the choice of previous history of the well operation.

scholarly journals Clinical Study of Postoperative Bleeding after Tonsillectomy in 497 Cases

2021 ◽  
Vol 4 (01) ◽  
pp. e17-e20
Author(s):  
Takeshi Tanaka ◽  
Kenji Ishii ◽  
Kyoko Matsumoto ◽  
Koushirou Miura ◽  
Ayako Kihara ◽  
...  
Keyword(s):  
Risk Factors ◽  
Body Mass Index ◽  
Clinical Study ◽  
General Anesthesia ◽  
Retrospective Analysis ◽  
Body Mass ◽  
Smoking Habit ◽  
Postoperative Bleeding ◽  
Operation Time ◽  
History Of

AbstractWe conducted a retrospective analysis of 497 patients who underwent tonsillectomy at Kamio Memorial Hospital from September 2015 to August 2018. A total of 35 cases (7.0%) developed postoperative bleeding and three cases (0.6%) needed a second operation under general anesthesia to stop the bleeding. Postoperative bleeding most frequently occurred between 24 hours and 6 days after the operation. The incidence of postoperative bleeding was significantly higher in males and in patients aged 20 to 39 years old. The operation time, body mass index, smoking habit, and history of hypertension were not identified as clinical risk factors for bleeding after tonsillectomy in this study.

L'uretere retrocavale: Embriogenesi e correzione laparoscopica con accesso retroperitoneale in un caso ad ansa bassa

1997 ◽  
Vol 64 (1_suppl) ◽  
pp. 18-22
Author(s):  
C. Trombetta ◽  
G. Savoca ◽  
G. Liguori ◽  
M. Raber ◽  
A. Lissiani ◽  
...  
Keyword(s):  
Operating Time ◽  
Oral Intake ◽  
Operation Time ◽  
Ureteral Stent ◽  
Surgical Wound ◽  
Extraperitoneal Approach ◽  
Intravenous Urogram ◽  
Minimal Morbidity ◽  
Urologic Surgery ◽  
Laparoscopic Techniques

With the minimal morbidity attained using laparoscopy, its application in urologic surgery has been increasing. Using laparoscopic techniques we successfully completed the transposition and re-anastomosis of a retrocaval right ureter. Operation time was 240 minutes. The patient was allowed to walk on the first post-operative day and resumed oral intake on the second day. Administration of analgesics was not required. The ureteral stent was removed on the 24th day after operation. An intravenous urogram three months after operation showed a decrease in hydronephrosis. Laparoscopic correction of retrocaval ureter by extraperitoneal approach is a safe, feasible technique, avoiding a large surgical wound with the definite advantage of minimal disfigurement. Operating time is considerably shorter compared to the peritoneal approach as described by Baba (240’ vs 560’).

The significance of the boundary between the Rhoscolyn and New Harbour formations on Holy Island, North Wales, to the deformation history of Anglesey

2012 ◽  
Vol 150 (3) ◽  
pp. 519-535 ◽  
Author(s):  
JACK E. TREAGUS ◽  
SUSAN H. TREAGUS ◽  
NIGEL H. WOODCOCK
Keyword(s):  
Lower Cambrian ◽  
Depositional Environment ◽  
High Strain ◽  
The Other ◽  
Deformation History ◽  
Two Phase ◽  
Phase Deformation ◽  
North Wales ◽  
History Of ◽  
Tectonic Features

AbstractThe boundary between the Rhoscolyn and New Harbour formations on Holy Island, Anglesey, has been described as a high strain zone or as a thrust. The boundary is here described at four localities, with reference to the contrasting sedimentary and deformational character of the two formations. At one of these localities, Borth Wen, sandstones and conglomerates at the top of the Rhoscolyn Formation are followed, without any break, by tuffs and then mudstones of the New Harbour Formation. It is concluded that there is clear evidence of depositional continuity across the boundary here, and that both formations subsequently shared a common two-phase deformation. The first (D1) was manifestly different in intensity and scale in the two formations, whereas the second (D2) produced very similar structures in both. The other three localities provide continuity of sedimentary and tectonic features at this boundary in a traverse along the length of Holy Island, leading us to identify two previously unrecognized major D1 folds in addition to the Rhoscolyn Anticline. At one of these localities (Holyhead), we confirm the presence of Skolithos just below the boundary, supporting radiometric evidence for a lower Cambrian or later age for the Rhoscolyn Formation. A turbidite interpretation for both the Rhoscolyn and New Harbour formations best fits the available evidence. A deep-water depositional environment is still compatible with the sporadic presence of Skolithos burrows, but less so with reported observations of hummocky and swaley cross-stratification lower down the South Stack Group.

Carboniferous-Triassic gastropod diversity patterns and the Permo-Triassic mass extinction

Paleobiology ◽  
1990 ◽  
Vol 16 (2) ◽  
pp. 187-203 ◽  
Author(s):  
Douglas H. Erwin
Keyword(s):  
Mass Extinction ◽  
Detrended Correspondence Analysis ◽  
Taxonomic Composition ◽  
Late Paleozoic ◽  
Lower Permian ◽  
Two Phase ◽  
Environmental Distribution ◽  
Extinction Rates ◽  
History Of ◽  
Permian Mass Extinction

Paleozoic and post-Paleozoic marine faunas are strikingly different in composition. Paleozoic marine gastropods may be divided into archaic and modern groups based on taxonomic composition, ecological role, and morphology. Paleozoic assemblages were dominated by pleurotomariids (Eotomariidae and Phymatopleuridae), the Pseudozygopleuridae, and, to a lesser extent, the Euomphalidae, while Triassic assemblages were dominated by the Trochiina, Amberleyacea, and new groups of Loxonematoidea and Pleurotomariina. Several new groups of caenogastropods appeared as well. Yet the importance of the end-Permian mass extinction in generating these changes has been questioned. As part of a study of the diversity history of upper Paleozoic and Triassic gastropods, to test the extent to which taxonomic and morphologic trends established in the late Paleozoic are continued after the extinction, and to determine the patterns of selectivity operating during the extinction, I assembled generic and morphologic diversity data for 396 genera in 75 families from the Famennian through the Norian stages. Within this interval, gastropod genera underwent an adaptive radiation during the Visean and Namurian, largely of pleurotomariids, a subsequent period of dynamic stability through the Leonardian, a broad-based decline during the end-Permian mass extinction, and a two-phase post-extinction rebound during the Triassic. The patterns of generic diversity within superfamily-level clades were analyzed using Q-mode factor analysis and detrended correspondence analysis.The results demonstrate that taxonomic affinity, previous clade history, generic age, and gross morphology did not determine survival probability of genera during the end-Permian extinction, with the exception of the bellerophontids, nor did increasing diversity within clades or expansion of particular morphologies prior to the extinction facilitate survival during the extinction or success after it. The pleurotomariids diversified during the Lower Permian, but were heavily hit by the extinction. Similarly, trochiform and turriculate morphologies, among those which Vermeij (1987) has identified as having increased predation resistance, were expanding in the late Paleozoic, but suffered similar extinction rates to other nondiversifying clades. Survival was a consequence of broad geographic and environmental distribution, as was the case during background periods.

scholarly journals A Clinical Control Study on the Retroperitoneal Laparoscopy for Unilateral Simple Renal Cyst Decortication in Day Surgery Mode

2020 ◽  
Author(s):  
Xiao-Liang Zhu ◽  
Song-Jiang Wu ◽  
Yasmeen Bano ◽  
Wen-Li Liu ◽  
Ming-Hui jiang ◽  
...  
Keyword(s):  
Renal Cyst ◽  
Previous History ◽  
Operation Time ◽  
Renal Cysts ◽  
Day Surgery ◽  
Simple Renal Cyst ◽  
Inpatient Ward ◽  
Medical Environment ◽  
History Of ◽  
Retroperitoneal Laparoscopy

Abstract Background: Under the constraints of the increasingly tight medical environment and cost, day surgery mode has become a favorable trend and attracts attention from clinicians. Currently, there are no standards or procedures on the retroperitoneal laparoscopy for unilateral simple renal cyst decortication in day surgery mode. We attempted to investigate the feasibility and safety criteria of unilateral simple renal cyst decortication by retroperitoneal laparoscopy in the day surgery ward and to compare the advantages and the disadvantages with conventional inpatient ward mode.Methods: A total of 41 patients with unilateral simple renal cysts meeting surgical indications were enrolled in this study. To see whether patients in the day group could successfully complete the procedure and be admitted and discharged within 24 hours and to summarize the advantages and the advantages. The indexes of the operation time, time of hospitalization, postoperative complication rate, total costs of hospitalization and other indicators were compared between the two groups.Results: 41 cases of unilateral simple renal cyst decortication were completed successfully. Patients were followed up 10-12 months after surgery. The results of time of hospitalization, total costs of hospitalization and time of postoperative removal of drainage tube were statistically significant between the two groups of the day ward group and the inpatient ward group (P <0.05). Conclusions: We concluded the retroperitoneal laparoscopy for unilateral simple renal cyst decortication in patients with unilateral renal cysts was safe and feasible in day surgery mode under certain indicative criteria. The criteria included patients’ age between 40 and 80 years, no previous history of abdominal surgery, CT showing a unilateral renal cyst (Bosniak I or II), preoperative ASA assessment was I or II, no contraindications to surgery or anesthesia, postoperative team management and discharge assessment. Advantage of reducing time of hospitalization and total medical cost may relieve the situation of the shortage of medical resources.

scholarly journals Preoperative predictors of enucleation time during en bloc no-touch holmium laser enucleation of the prostate

2020 ◽  
Author(s):  
Chun-Hsuan Lin ◽  
Ching-Chia Li ◽  
Wen-Jeng Wu ◽  
Sheng-Chen Wen
Keyword(s):  
Operation Time ◽  
Holmium Laser ◽  
En Bloc ◽  
Symptomatic Benign Prostatic Hyperplasia ◽  
Clinical Variables ◽  
Specimen Weight ◽  
History Of ◽  
Laser Enucleation ◽  
Holmium Laser Enucleation ◽  
Preoperative Predictors

Abstract Background To evaluate preoperative predictors of enucleation time during en bloc no-touch holmium laser enucleation of the prostate (HoLEP) Methods We enrolled 135 patients with symptomatic benign prostatic hyperplasia (BPH) treated with en bloc no-touch HoLEP from July 2017 to March 2019 by a single surgeon. Preoperative, perioperative, and postoperative clinical variables were examined. Stepwise linear regression was performed to determine clinical variables associated with enucleation times. Result The average (range) enucleation time was 46.1 (12–220) minutes, and the overall operation time was 71 (18–250) minutes. History of anticoagulation, history of urinary tract infection (UTI), and increasing specimen weight were each significantly associated with increasing enucleation time. No category IV complications were recorded, and all complications were evenly distributed among the groups according to the HoLEP specimen weight. Conclusion En bloc no-touch HoLEP was found to be an efficient and reproducible surgical method for treating BPH. Prostatic gland size was significantly associated with increased enucleation times. Similarly, history of UTI and anticoagulation were correlated with increased operative time.

NEUTRALIZING ANTIBODIES AGAINST MOUSE-ADAPTED LANSING STRAIN OF POLIOMYELITIS VIRUS IN THE SERA OF ACUTE AND CONVALESCENT CASES AND NORMAL INDIVIDUALS

1950 ◽  
Vol 28e (2) ◽  
pp. 34-40
Author(s):  
E. L. Barton ◽  
N. A. Labzoffsky ◽  
W. G. Ross ◽  
L. P. Morrissey
Keyword(s):  
British Columbia ◽  
Neutralizing Antibodies ◽  
Acute Stage ◽  
Present Communication ◽  
Two Phase ◽  
Poliomyelitis Virus ◽  
Normal Individuals ◽  
History Of

The present communication deals with a survey of neutralizing antibodies to mouse-adapted Lansing strain of poliomyelitis virus in the sera of acute, convalescent, and normal individuals during a 1946 epidemic. Two-phase sera were obtained from residents of Ontario and British Columbia and convalescent and normal sera from Quebec. In the sera of 17 out of 35 Ontario patients neutralizing antibodies were demonstrable during the acute stage. In four of these seropositive individuals, there was an increase in the neutralizing titer during convalescence and in three patients there was a notable drop in the titer. The remaining 18 patients were found to be seronegative during both the acute and convalescent stages. Sera from six out of nine British Columbia patients, likewise contained neutralizing antibodies to the Lansing strain of virus during the acute stage. In four of these the titer remained unchanged during convalescence, in one the titer decreased, and another patient became seronegative. Of the remaining three, two continued to be seronegative and one became seropositive during convalescence. Positive neutralization reactions were obtained with 17 out of 44 convalescent sera from Ontario and 62 out of 146 convalescent sera from Quebec Sera from 51 children without history of poliomyelitis and 100 adult sera taken at random from specimens submitted for Wassermann tests were obtained from Quebec. Of the children's sera 43%, and of the adults’, 48%, contained neutralizing antibodies. The results obtained closely agree with those reported by American workers.

Dimensioni e direttrici del mutamento socio-economico in prospettiva territoriale dal 1951 a oggi

2013 ◽  
pp. 78-92
Author(s):  
Domenico Maddaloni ◽  
Fiorenzo Parziale
Keyword(s):  
Principal Component Analysis ◽  
Linear Regression ◽  
Southern Italy ◽  
Principal Component ◽  
Research Strategy ◽  
Two Phase ◽  
Economic Changes ◽  
Local Contexts ◽  
Italian Provinces ◽  
History Of

In this study we go back to examine the economic and sociological changes throughout the local contexts and divisions of our country. The instrument used is a research strategy that combines a two-phase principal component analysis developed by Di Franco and Marradi with multiple linear regression. From data inherent to four key moments in the recent history of Southern Italy and the whole country - 1951, 1971, 1991 and 2007 - we obtain four «photographs» of dimensions that clarify the structure of the selected variables. We then propose two models of path analysis that underline the causal links between the factors emerged from the PCA, in order to reconstruct the socio-economic changes in the Italian provinces from 1951 to 2007.

Differences in Outcome Between Open vs Laparoscopic Insertion of Ventriculoperitoneal Shunts

2021 ◽  
pp. 000313482110505
Author(s):  
Aaron B. Lopacinski ◽  
Kevin M. Guy ◽  
Jessica R. Burgess ◽  
Jay N. Collins
Keyword(s):  
Abdominal Surgery ◽  
General Surgery ◽  
Operation Time ◽  
Laparoscopic Group ◽  
Prior History ◽  
Team Approach ◽  
Tertiary Referral Hospital ◽  
Shunt Insertion ◽  
Vp Shunt ◽  
History Of

Background Abdominal access during ventriculoperitoneal (VP) shunt insertion has historically been obtained by neurosurgeons via an open abdominal approach. With recent advances in laparoscopy, neurosurgeons frequently consult general surgery for aid during the procedure. The goal of this study is to identify if laparoscopic assistance improves the overall outcomes of the procedure. Methods This retrospective study included all patients who underwent open or laparoscopic VP shunt placement between September 2012 and August 2020 at our tertiary referral hospital. Patient demographics, comorbidities, prior history of abdominal surgery, open vs. laparoscopic insertion, operation time, and complications within 30 days were obtained. Results Neurosurgery placed 107 shunts using an open abdominal technique and general surgery placed 78 using laparoscopy. The average OR time in minutes was 75.5 minutes for the open cohort and 61.8 for the laparoscopic cohort ( p = 0.006). In patients without a history of abdominal surgery, the average OR time in minutes was 79.4 in the open cohort and 57.1 in the laparoscopic cohort ( p = 0.015). The postoperative shunt infection rate was 10.2% in the open group and 3.8% in the laparoscopic group ( p = 0.077). Discussion Laparoscopic placement of VP shunts is a reasonable alternative to open placement and results in shorter OR times. There is also a trend toward few infections in the laparoscopic placement. There appears to be an advantage with a team approach and laparoscopic placement of the peritoneal portion of the shunt.

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