Mukul Sharma - Academia.edu (original) (raw)

Papers by Mukul Sharma

The European Physical Journal B, 2005

Polymer embedded cadmium sulfide nanoparticles/quantum dots were synthesized by a chemical route ... more Polymer embedded cadmium sulfide nanoparticles/quantum dots were synthesized by a chemical route using polyvinyl alcohol (lmw) as the desired matrix. In an attempt to measure the electrical properties of nano-CdS/Ag samples, we propose that contribution from surface traps are mainly responsible in determining the I~ V and C~ V characteristics in high frequency ranges. To be specific, beyond 1.2 MHz, the

$Research paper thumbnail of A new reservoir scale model for fracture propagation and stress reorientation in waterflooded reservoirs$

Day 1 Mon, October 09, 2017, 2017

Over the past two decades, Diagnostic Fracture Injection Tests (DFIT) or Injection-Fall-off Fract... more Over the past two decades, Diagnostic Fracture Injection Tests (DFIT) or Injection-Fall-off Fracture Calibration Tests have evolved into a commonly used and reliable technique to evaluate reservoir properties, fracturing parameters and obtain in-situ stresses. Since the introduction of DFIT analysis based on G-function and its derivative, this method has become standard practice for quantifying minimum in-situ stress and leak-off coefficient. However, the pressure decline model that underlies the G-function plot makes two distinct and important assumptions: (1) leak-off is not pressure-dependent and, (2) fracture stiffness (or compliance) is assumed to be constant during fracture closure. Fracture closure is a gradual process that starts when asperities at the fracture tip first come into contact with each other. As pressure declines due to leak-off, more and more of the fracture wall comes into contact. It is important to model this process quantitatively to obtain good estimates o...

SPE Journal, 2018

Summary A new method is proposed to estimate the compliance and conductivity of induced unpropped... more Summary A new method is proposed to estimate the compliance and conductivity of induced unpropped fractures as a function of the effective stress acting on the fracture from diagnostic-fracture-injection-test (DFIT) data. A hydraulic-fracture resistance to displacement and closure is described by its compliance (or stiffness). Fracture compliance is closely related to the elastic, failure, and hydraulic properties of the rock. Quantifying fracture compliance and fracture conductivity under in-situ conditions is crucial in many Earth-science and engineering applications but is very difficult to achieve. Even though laboratory experiments are used often to measure fracture compliance and conductivity, the measurement results are influenced strongly by how the fracture is created, the specific rock sample obtained, and the degree to which it is preserved. As such, the results may not be representative of field-scale fractures. During the past 2 decades, the DFIT has evolved into a comm...

$Research paper thumbnail of Re-examining interpretations of non-ideal behavior during diagnostic fracture injection tests$

Journal of Petroleum Science and Engineering, 2016

$Research paper thumbnail of A computationally efficient approach to modeling contact problems and fracture closure using superposition method$

Theoretical and Applied Fracture Mechanics, 2018

$Research paper thumbnail of Modeling of hydraulic fracture closure on proppants with proppant settling$

Journal of Petroleum Science and Engineering, 2018

$Research paper thumbnail of A non-local model for fracture closure on rough fracture faces and asperities$

Journal of Petroleum Science and Engineering, 2017

Day 1 Tue, January 23, 2018, 2018

During hydraulic fracturing, natural fractures and bedding planes can intersect with growing hydr... more During hydraulic fracturing, natural fractures and bedding planes can intersect with growing hydraulic fractures and form complex fracture networks. This can result in the flow of fluid and proppant in convoluted fracture pathways with highly variable fracture width and height. Existing models of hydraulic fracturing assume a planar fracture geometry and are unable to simulate proppant placement in such complex networks. In this work, we investigate proppant transport in growing fracture networks using a fully three-dimensional, geomechanical fracture flow, network model with the ability to simulate proppant transport. A three-dimensional hydraulic fracturing simulator developed using the displacement discontinuity method is coupled with a network model for proppant transport. The simulator captures the effect of proppant concentration, fracture width, and fluid rheology on proppant transport. The equations for the fracture network geomechanics, the fluid flow, and the proppant tran...

Energies, 2021

Stranded gas emission from the field production because of the limitations in the pipeline infras... more Stranded gas emission from the field production because of the limitations in the pipeline infrastructure has become one of the major contributors to the greenhouse effects. How to handle the stranded gas is a troublesome problem under the background of global “net-zero” emission efforts. On the other hand, the cost of water for hydraulic fracturing is high and water is not accessible in some areas. The idea of using stranded gas in replace of the water-based fracturing fluid can reduce the gas emission and the cost. This paper presents some novel numerical studies on the feasibility of using stranded natural gas as fracturing fluids. Differences in the fracture creating, proppant placement, and oil/gas/water flowback are compared between natural gas fracturing fluids and water-based fracturing fluids. A fully integrated equation of state compositional hydraulic fracturing and reservoir simulator is used in this paper. Public datasets for the Permian Basin rock and fluid properties ...

All Days, 2013

This paper demonstrates how simulation of wellbore pressures during different blowout scenarios; ... more This paper demonstrates how simulation of wellbore pressures during different blowout scenarios; borehole stability analysis and solids transport can be applied to the problem of blowout risk assessment. This is a technology area that previously has been overlooked by petroleum geomechanics practitioners. The proposed analysis methodology emphasizes the importance of understanding the transient evolution of the kick within the borehole, as this is a key factor in assessing whether bridging is likely to occur during the events leading up to a blowout. Three representative situations are analyzed and conditions leading to self-killing are reviewed. Analyses of a shallow-gas kick and blowout reproduce the numerous field observations that self-killing is likely from the combination several possible mechanisms – borehole collapse of soft shales, sand erosion leading to cavity collapse in the initially-overpressured aquifer zone, gas depressurization and brine influx. For deeper water sce...

GEOPHYSICS, 2019

Proppant mapping is critical for optimizing fracture treatment design and improving wells’ produc... more Proppant mapping is critical for optimizing fracture treatment design and improving wells’ productivity. An electrode-based resistivity tool concept was developed earlier for proppant mapping in cased-hole wells. An array of insulating gaps is installed and cemented in place as a permanent part of the casing string. The electrical measurements are performed by imposing a voltage across each insulating gap, one at a time, before and after hydraulic fracture operations. The voltages across other insulating gaps near the transmitter gap are recorded. The method relies on direct excitation of the casing, which is expected to overcome the severe limitations of induction tools in cased-hole wells. A forward model based on a finite volume method has been developed to simulate the tool’s response to one or multiple fractures. To enable the implementation of such a practical system in multistage fractured horizontal wells, a fast and robust inversion approach is required. To that end, we hav...

Energies

The productivity of a hydraulically fractured well depends on the fracture geometry and fracture–... more The productivity of a hydraulically fractured well depends on the fracture geometry and fracture–wellbore connectivity. Unlike other fracture diagnostics techniques, flowback tracer response will be dominated only by the fractures, which are open and connected to the wellbore. Single well chemical tracer field tests have been used for hydraulic fracture diagnostics to estimate the stagewise production contribution. In this study, a chemical tracer flowback analysis is presented to estimate the fraction of the created fracture area, which is open and connected to the wellbore. A geomechanics coupled fluid flow and tracer transport model is developed to analyze the impact of (a) fracture geometry, (b) fracture propagation and closure effects, and (c) fracture complexity on the tracer response curves. Tracer injection and flowback in a complex fracture network is modeled with the help of an effective model. Multiple peaks in the tracer response curves can be explained by the closure of...

Energies

Journal of Petroleum Technology

... A review of fracture-diagnostic data col-lected from various wells in different areas (for co... more ... A review of fracture-diagnostic data col-lected from various wells in different areas (for conventional gel fracs and waterfracs) suggested that ... B. Gadde, U. of Texas at Austin; Richard Sullivan, SPE, Richard Sigal, SPE, Robin Fielder, SPE, and David Copeland, SPE, Anadarko ...

$Research paper thumbnail of Effect of macrofractures on acoustic properties of rocks$

SEG Technical Program Expanded Abstracts 1993