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Analytical model for pressure and rate analysis of multi-fractured horizontal wells in tight gas reservoirs

Fig. 5 Transient pressure type curves of MFHW in tight gas reservoir

Fractal porosity and permeability were employed to describe the heterogeneous distribution of the complex fracture network. The stress sensitivity of fractures was also considered in the model. Pedrosa substitution and perturbation method were applied to eliminate the nonlinearity of the model. Analytical solutions in the Laplace domain were obtained using

The integrated feasibility analysis of water reuse management in the petroleum exploration performances of unconventional shale reservoirs

Fig. 2 Percentage of freshwater sources.

The objective of this comprehensive study is to conduct an investigation into the studied field and analyze the assessment of necessary water and produced water which is provided in the surface for reinjection procedures in the hydraulic fracturing and water injectivity; in respect of the way, petroleum and drilling industries

Mudcake effects on wellbore stress and fracture initiation pressure and implications for wellbore strengthening

Fig. 1 Schematic of the cross section of wellbore, mudcake, and formation (not to scale)

Numerical examples are provided to illustrate the effects of these mudcake parameters. The results show that a low-permeability mudcake enhances FIP, mainly through restricting fluid seepage and pore pressure increase in the near-wellbore region, rather than by mudcake strength. Fluid loss pressure (FLP) should be distinguished from FIP when a

Estimation of fracture aperture from petrophysical logs using teaching–learning-based optimization algorithm into a fuzzy inference system

Fig. 10 Processed image logs, conventional well logs, and estimated hydraulic aperture for each fracture plane. The last column shows the comparison between core permeability and derived values

Recently, some artificial intelligence techniques facilitated reliable estimations of reservoir parameters. In this paper, a teaching–learning-based optimization algorithm (TLBO) trained an initial fuzzy inference system to estimate hydraulic aperture of detected fractures using well logs responses. Comparing the results with real measurements revealed that the model can provide reliable estimations

Optimization of Multiple Hydraulically Fractured Horizontal Wells in Unconventional Gas Reservoirs

Figure 5: Two scenarios of multiple horizontal well placement.

This paper demonstrates the accuracy of numerical modeling of multistage hydraulic fractures for actual Barnett Shale production data by considering the gas desorption effect. Six uncertain parameters, such as permeability, porosity, fracture spacing, fracture half-length, fracture conductivity, and distance between two neighboring wells with a reasonable range based on Barnett

Preparation and application of melamine cross-linked poly ammonium as shale inhibitor

Fig. 3 The appearance of mud balls immersed in different treatment solutions for 12 h. a Distilled water, b 0.8% DEM-8, c 1.0% KCl, d 0.8% DEM-8 + 1.0% KCl

The inhibition mechanism of DEM-8 was studied by thermogravimetric analysis and scanning electron microscope. The results demonstrate that DEM-8 can be adsorbed on clay surface through electrostatic interaction and hydrogen bonds by an anchoring effect and a hydrophobic effect. Introduction Shale oil/gas has been one of the technologies highlighted in the world

Brittleness modeling of Cambay shale formation for shale gas exploration: a study from Ankleshwar area, Cambay Basin, India

Fig. 11 P-impedance volume cross section along well #2 and well #3 in study area

The geomechanical study of a shale gas reservoir is useful in identifying the intervals which can be fractured effectively. The estimation of geomechanical properties from well logs and their calibration with laboratory-derived properties on cores has been attempted in the present paper for Cambay shale of Cambay Basin, India, which

Thermogravimetry as a tool for measuring of fracturing fluid absorption in shales

Fig. 6 Comparison of absorbance capacity of the examined samples. Explanations: 0—blank test—fresh sample, W—distilled water saturated, F—the same sample saturated with fracturing fluid, F2—fresh sample saturated with fracturing fluid

In case of rocks which are drilled from the borehole, obtaining such large samples is very difficult; therefore, an attempt was made to determine the rock absorption on small samples, using the TG analysis. Thermogravimetric (TG/DTG) experiments were conducted in temperature range 40–300 °C in synthetic air environment. Shale rock

Enhancing recovery and sensitivity studies in an unconventional tight gas condensate reservoir

Fig. 2 Permeability and porosity variation of the simulation model. a Permeability distribution. b Porosity distribution

Sensitivity analysis of the key factors such as primary production duration, bottom-hole pressures, and fracture conductivity is conducted and their effects on the well production performance are analyzed. Results show that, compared with the simple depletion method, both the cumulative gas and condensate production increase with fluids injected. Produced gas

Exploitation of fractured shale oil resources by cyclic CO2 injection

Fig. 1 Proppant transport scenarios (Cipolla et al. 2010)

In this paper, we address the question whether we should exploit or confine the fracture complexity for CO2-EOR in shale oil reservoirs. Two proppant transport scenarios were simulated in this paper: Case 1—the proppant is uniformly distributed in the complex fracture system, propagating a partially propped or un-propped fracture network;

Evaluation of the shale beds within Alam El Bueib Formation as an unconventional reservoir, Western Desert, Egypt

Fig. 1 Location of Betty-1 well

The TOC in the studied samples indicates poor to very good organic continent, while the hydrocarbon potentiality (S1 and S2) indicates poor source potential. The hydrogen index reflected kerogen type III/II. These data indicate that AEB Formation may be considered as a good source for generating hydrocarbons (mainly gas with

Troubleshooting gridding issues in Petrel: Effect of MAPAXES Eclipse keyword and IJK Origin in Petrel

Fig. 1.1: ECLIPSE export settings window

There might be 16 different combinations of the origin location and the order of reading i, j and k direction as the following table shows: 2. Problem Statement Using of Petrel as modeller and ECLIPSE as simulator will not require higher level of background understanding of origin cell and map axes assumptions;

Hydrocarbon generation potential of shales in Hekimhan basin Eastern Anatolia Region, Turkey

Fig. 3 Stratigraphic columnar sections of the Hekimhan Formation (modified from Gürer 1992) and sampled measured sections (locations 1 and 2).

Hydrocarbon generation potential of late cretaceous shales and carbonates in Hekimhan basin and genetic relationships with Karadere oil seep (Eastern Anatolia Region, Turkey) On the basis of average Tmax (433 °C) and 0.53% R0 values, the investigated samples are at the immature and early mature level for hydrocarbon generation. According to

Converting Eclipse Data Deck to Petrel Case (Petrel 2011.1)

Figure 2: Case Conversion processing illustration

Figure 1: Case Conversion in Petrel Online Manual Case Conversion Methodology In Petrel, reverse engineering and case conversion are different terms for the same process of converting Eclipse data deck in Petrel case. Petrel needs .DATA, the associated grid and .INIT files to perform the case conversion. Petrel distinguishes the GRID|EDIT section properties which

Reservoir and Fracture Modelling: Connection Factor Export for Fractured Cells

Figure 4 Areal resolution 240x240 ft, with (red) and without (green) the skin calculation. The thick line is a simulation on 7.5x7.5 ft cells.

In case the fracture cell is small (smaller than Peaceman radius) then we recommend setting the diameter of the wellbore in the global completion to a small value so that the Peaceman radius will not be smaller than the wellbore radius. If running ECLIPSE Compositional it is possible to use the