Difference between revisions of "Category: OptiFracMS"

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Choke skin is defined as the additional pressure loss because of convergence of flow in the vertical fracture to the horizontal wellbore.
 
Choke skin is defined as the additional pressure loss because of convergence of flow in the vertical fracture to the horizontal wellbore.
  
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:<math>{J_D}_{choke}= \frac{n}{J_D}+\frac{1}{0} \frac{1}{0} \left ( ln(h/2r_w)-\pi/2 \right )</math>
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:<math>{J_D}_{choke}= \frac{n}{\frac{n}{J_D}+\frac{1}{0} \frac{1}{0} \left ( ln(h/2r_w)-\pi/2 \right )}</math>
  
 
=== Width constraint===
 
=== Width constraint===

Revision as of 09:29, 11 November 2019

Multistage Fracturing Software

pengtools optiFracMS

optiFracMS is a software to optimize the number of hydraulic fractures in horizontal well [1].

For the given set of reservoir properties and the proppant mass optiFracMS calculates optimal number of transverse hydraulic fractures and required fractures geometry to maximize well productivity index.

optiFracMS is available online at www.pengtools.com.

Typical applications

  • Multistage Fracturing Design in tight oil and gas reservoirs
    • How many fractures are required to maximize production?
      • Number of fractures, n.
    • What fractures geometry is required to maximize production?
      • Dimensionless Fracture conductivity, CfD .
      • Fracture half length, Xf .
      • Fracture width, w .
      • Fracture penetration, Ix .
    • What would be the optimal productivity index?
      • Dimensionless productivity index, JD .
  • Multistage Post fracture performance reviews
    • Find out how far your well's productivity from where it should be (from the optimum)
  • Multistage Fracturing Sensitivity Studies and Benchmarking

Math & Physics

Horizontal well with multiple transverse fractures in a rectangular drainage area
J_D=\frac{3}{\pi}\ \frac{N_p}{X_e/Y_e} - technical potential for multistage fracturing [1],
N_p=\frac{2 k_f V_f}{k V_r} - proppant number,
I_x=\frac{2x_f}{X_e} - penetration ratio,
C_{f_D}=\frac{k_f w_f}{k x_f} - dimensionless fracture conductivity,

Type Curves

The type curves show multistage fracturing dimensionless productivity index, JD , at pseudo-steady state as a function of number of fractures, n and proppant number, Np for a horizontal well with multiple transverse hydraulic fractures in a square drainage area.

Open in optiFracMS

Type Curves were obtained, through 28,000 runs with direct boundary element (DBE) method [1]. These type curves are also applicable for the case of rectangular (nonsquare) drainage areas. The modification needed for a rectangular well drainage is to divide both number of fractures and the corresponding JD by (Xe/Ye) [1].

Physical Constraints

Choke skin

Choke skin is defined as the additional pressure loss because of convergence of flow in the vertical fracture to the horizontal wellbore.

{J_D}_{choke}= \frac{n}{\frac{n}{J_D}+\frac{1}{0} \frac{1}{0} \left ( ln(h/2r_w)-\pi/2 \right )}

Width constraint

Flow Diagram

Workflow

Case Study

Main features

  • Plot of JD as a function of n and Np as parameter.
  • Plot of JD as a function of Np showing the width constraint influence.
  • Plot of JD and wf as a function of n for the given Np .
  • Plot of JD as a function of CfD for the given n.
  • Design optimization curves which corresponds to the maximum JD values for different Np and n.
  • Optimum number of fractures n and well JD.
  • Practical constrains envelope – minimum fracture width and choke skin effect.
  • Sensitivity for the different from the optimal n, Xf, Ix, CfD, wf.
  • Hydraulic fracturing proppant catalog with the predefined proppant properties.

Interface features

  • Save and share models with colleagues
  • Last saved model on current computer and browser is automatically opened
  • Metric and US oilfield units
  • Save as image and print plots by means of chart context menu (button at the upper-right corner of chart)
  • Download pdf report with input parameters, calculated values and plots
  • Select and copy results to Excel or other applications

References

  1. ↑ 1.0 1.1 1.2 1.3 Guk, Vyacheslav; Tuzovskiy, Mikhail; Wolcott, Don; Mach, Joe (June 2019). "Optimizing Number of Fractures in Horizontal Well"Free registration required. SPE Journal. Society of Petroleum Engineers. 24 (SPE-174772-PA). 
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