The Effect of Hole Curvature on the Wellbore Pressure Loss Prediction for Highly Tortuous Ultradeep Wells

2004 ◽  
Author(s):  
G. Robello Samuel
Keyword(s):  
Pressure Loss ◽  
Wellbore Pressure ◽  
Loss Prediction

Hole Cleaning and Pressure Loss Prediction From a Bulk Transport Perspective

2005 ◽  
Author(s):  
Biplab Kumar Datta ◽  
Chandana Ratnayake ◽  
Arild Saasen ◽  
Tor Henry Omland
Keyword(s):  
Pressure Loss ◽  
Hole Cleaning ◽  
Loss Prediction ◽  
Bulk Transport

Ultra high speed investigation of gaseous jet injected by a single-hole injector and proposing of an analytical method for pressure loss prediction during transient injection

Fuel ◽  
2016 ◽  
Vol 184 ◽  
pp. 100-109 ◽  
Author(s):  
Alireza Hajialimohammadi ◽  
Daniel Edgington-Mitchell ◽  
Damon Honnery ◽  
Nader Montazerin ◽  
Amir Abdullah ◽  
...  
Keyword(s):  
Analytical Method ◽  
Pressure Loss ◽  
High Speed ◽  
Single Hole ◽  
Ultra High Speed ◽  
Loss Prediction

Using a 3D hydraulic fracture simulator to assess the impact of perforation design on high near-wellbore pressure loss in the Cooper Basin

2016 ◽  
Vol 56 (2) ◽  
pp. 569
Author(s):  
Nicholas Eades ◽  
Mohit Patter ◽  
Aldi Smokaj
Keyword(s):  
Hydraulic Fracture ◽  
Pressure Loss ◽  
Interval Length ◽  
Vertical Wells ◽  
Differential Stress ◽  
The Past ◽  
Industry Standard ◽  
Wellbore Pressure ◽  
The Impact ◽  
Cooper Basin

Fracture stimulation in the Cooper Basin has long been challenged by high near-wellbore pressure loss (NWBPL) present in hydraulic fracture treatments. Though many strategies have been applied to either mitigate or prevent this, the industry is still in need of a broadly applicable, economic and practical solution. An approach that has significant potential, and targets NWBPL from its foundation, is perforation design. Perforation design has been shown in the past to have a significant effect on the initiation of a fracture and the success of its continued propagation. A commercial 3D hydraulic fracture simulator has been applied to data from Cooper Basin wells. These vertical wells contain tight sand intervals and are characterised by high differential stress. A sensitivity analysis has been performed using industry-standard GOHFER software, focusing on parameters including perforation diameter, shot density, interval length, number of intervals, and shot spacing. Though many previous authors have suggested that perforation design has limited impact on pressure loss, the analysis performed in this study indicates that there are methods inherent in perforation design that can impact on high NWBPL. In particular, this study has noted a potential for many cost-saving strategies that could be applied to future completions. This is an innovative study that examines the underlying links between perforation design and the resulting near-wellbore pressure loss. It focuses on problematic areas of the Cooper Basin in the hope that by examining these links useful recommendations can be made to the industry.

Coiled Tubing Fracturing Tube Pressure Loss Prediction Model

2013 ◽  
Vol 746 ◽  
pp. 515-519
Author(s):  
Dan Qiong Li ◽  
Shi Cheng Zhang ◽  
Suian Zhang
Keyword(s):  
Prediction Model ◽  
Pressure Loss ◽  
Rheological Parameters ◽  
Straight Pipe ◽  
Coiled Tubing ◽  
Friction Pressure ◽  
Loss Prediction ◽  
Pipe Segment ◽  
Basic Characteristics ◽  
Fluid Rheology

A coiled tubing pressure loss prediction model was established by fluid dynamics theory and method which based on the basic characteristics of the non-Newtonian fluid rheology; Construction displacement, sand ratio and well depth parameters of the pressure loss in the pipe, and calculated pipe pressure loss when the actual pumping process through examples. Thesis proposes: (1) the bend within the pressure loss is an important part of the pressure loss, should be based on the construction object to choice coiled tubing length reasonable, and minimize elbow paragraph length in order to reduce the pipe friction pressure loss. (2) Flow and sand ratio have the same impact of the law with the depth changes in the pressure loss of the straight pipe segment and elbow segment, increases linearly with the depth, flow or sand ratio the larger, more dramatic increase with the depth. Flow or sand ratio the larger the total pressure loss of the tube with the depth decreasing amplitude the greater. (3) According to the actual pump injection procedure, the tube fluid rheological parameters will change, inject pre-flush and replacement fluid the pipe pressure loss low; inject sand mixing liquid friction pressure loss high.

Pressure Profile in Annulus: Solids Play a Significant Role

2014 ◽  
Author(s):  
Feifei Zhang ◽  
Stefan Miska ◽  
Mengjiao Yu ◽  
Evren Ozbayoglu ◽  
Nicholas Takach
Keyword(s):  
Flow Rate ◽  
Pressure Loss ◽  
Drilling Fluid ◽  
Pressure Profile ◽  
Accurate Estimation ◽  
Circulation System ◽  
Precise Knowledge ◽  
Significant Difference ◽  
Wellbore Pressure ◽  
Drilling Operations

In drilling operations, accurate estimation of pressure profile in the wellbore is essential to achieve better bottom hole pressure control. Adjusting the drilling fluid properties and optimizing flow rate require precise knowledge of the pressure profile in the circulation system. Annular pressure profile calculations must consider solids present in the drilling fluid because the solids drilled from formations may have a significant effect on pressure in the wellbore. In cases of high solids fraction or solid pack off, the pressure loss caused by solids is much higher than the friction pressure loss. This paper looks into the effect of solids on the wellbore pressure profile under different conditions. An extensive number of experiments were conducted on a 90-ft-long, 4.5″x8″ full-scale flow loop to simulate field conditions. The effects of solids on pressure profile in the annulus are investigated. In the experimental results, a significant difference is found between the pressure profile with solids and without solids in the wellbore. A practical approach to calculate the pressure profile by considering the effects of solids in the wellbore is developed. This approach is based on the results of solids behavior in the wellbore. Both solids fraction in the well and solids pack off are considered in the proposed approach. The prediction results are in good agreement with the experimental data. The results of this study show how the pressure profile in the wellbore varies when solids present in the annulus. The pressure gradient with solids can be several times larger than the pure friction loss without solids. A decrease in flow rate may lead to a higher pressure profile and the risk of solids pack off in the wellbore because it increases the solids fraction. Results of this paper may have important applications in drilling operations.

Gel Slugs: A Near-Wellbore Pressure-Loss Remediation Technique for Propped Fracturing

2000 ◽  
Author(s):  
S.T. Chipperfield ◽  
G.A. Roberts ◽  
W.K. Miller ◽  
R.S. Vandersypen
Keyword(s):  
Pressure Loss ◽  
Wellbore Pressure
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