Abstract This experimental study explores the acoustic signal generated when water/sand slurry flows through perforations in frequency domain. The goal is to identify proppant presence on distributed sensors (DAS), and possibly estimate concentration distribution during a multi-stage fracture treatment using DAS monitoring data. We have studied whether sand-related signals can be distinguished from water flow domain, what are components of for proppant, how do or other parameters affect...

Abstract Horizontal wells intersecting multistage transverse fractures created by low viscosity fracturing fluid with proppant loadings are the key to revitalizing production from Mississippian Barnett shale of Fort Worth Basin in Texas. However, direct laboratory measurements both natural and induced fracture conductivities under realistic experimental design conditions needed for reliable well performance analysis optimization. In this work, a series experiments were conducted measure...

Summary This paper presents a transient wellbore simulator coupled with semianalytic temperature model for computing wellbore-fluid-temperature profiles in flowing and shut-in wells. Either an analytic or numeric reservoir can be combined the rapid computations of pressure, temperature, velocity. We verified data from gas oil wells, where both surface downhole were available. The accuracy heat-transfer calculations improved variable-earth-temperature newly developed numerical-differentiation...

Summary Matrix-acidizing models have traditionally underpredicted acid-stimulation benefits because of underprediction wormhole penetration and the corresponding magnitude completion-skin factors in vertical wells. For long horizontal wells drilled carbonate reservoirs, productivity enhancement is a function acid placement effective penetration. However, prediction requires more analysis than that provided by current industry models. This paper presents results matrix-acid modeling work for...

Abstract Metal‐organic frameworks (MOFs)@g‐C 3 N 4 heterojunctions are widely investigated as one of the most potential photocatalysts for 2 fixation owing to visible absorption and effective photocatalytic properties. It is still a huge challenge synthesize hollow spherical C coated with Nano‐MOF layers towards efficient activity on fixation. In this work, paramagnetic (H‐C ) free radical MOF sulfhydryl ligand (Nano‐SH‐MOF)[Zn (DSBDC)] by self‐assemble method. The C8 M2 samples (the mass...

Summary In this paper, we present a new analytical model for formation damage skin factor and the resulting reservoir inflow, including effect of anisotropy heterogeneity. The shape damaged region perpendicular to well is based on pressure equation an anisotropic medium and, thus, circular near elliptical far from well. can be used various distributions along well, depending time exposure during drilling completion. inflow damaged, parallel-piped-shape illustrates importance ratio thickness...

Abstract Various fracture interaction criteria were reviewed and a systematic study is presented to analyze the effect of natural fractures on hydraulic propagation. From literature review, approach Warpinski Teufel was adopted evaluat propagation that would occur after intersects an existing fracture. The determined conditions differential stress, angle intersection, toughness for which dilation occur. Criteria subsequent modes are then presented.

Abstract Multilayer transient testing commonly relies on a series of step rate changes in surface flow with acquisition stabilized profiles before each change and stationary downhole pressure measurements after change. The procedure requires one for layer to be characterized, overall test duration can quite long depending the number layers characterized. This study introduces an entirely new approach that uses temperature data at multiple locations together single-point measurement. Because...

Abstract The conductivity of an acid-etched fracture depends strongly on void spaces and channels along the resulting from uneven acid etching walls. In this study, we modeled deformation rough surfaces acidized in heterogeneous formations based synthetic permeability distributions developed a new correlation to calculate conductivity. our previous work, dissolution having small-scale heterogeneities permeability. characterization correlated fields rock includes average permeability,...

Summary With the recent development of temperature measurement systems such as fiber-optic distributed sensors, continuous profiles in a horizontal well can be obtained with high precision. Small changes resolution on order 0.1°F detected by modern temperature-measuring instruments intelligent completions, which may aid diagnosis downhole flow conditions. Since producing fluid inflowing is not affected elevational geothermal changes, primary differences for each phase (oil, water, and gas)...

Abstract Multilayer transient testing is designed for determining individual layer properties (permeability and skin) multiple layers commingled in a well. Traditional multilayer requires combination of rate profiles from production log pressure measurements acquired at surface rates. This method can be time consuming may involve significant errors depending on the accuracy flow measurements. Today, many wells are equipped with downhole sensors that provide distributed or multipoint...

Summary In the acid-fracturing process, fracture conductivity created by acid etching of walls is because surface roughness acid's nonuniform dissolution surfaces. The acid-fracture dependent on patterns, which are determined permeability and mineralogy distributions. That is, spatial distribution affects conductivity, cannot be considered in laboratory measurements use core samples that too small to observe such macroscale heterogeneities, or typical simulators, gridblock size much larger...

Abstract Artificially created fracture networks with sufficient conductivities are essential for economic production from shale reservoirs. Fracture conductivity can be significantly reduced in formations due to severe proppant embedment. In addition, embedment induces flakes that migrate and clog networks. A laboratory investigation was performed understand how excessive caused by the shale-water interaction impairs conductivity. The experiments were conducted using Barnett samples...

Abstract Today there are still many challenges in the quantitative interpretation of downhole distributed temperature measurements to diagnose multistage fracture treatments horizontal wells. These include handling enormous amount data measured by sensors continuously time and space domain, a readily-to-be-used fast but robust forward model simulate behavior, an efficient algorithm inverse parameters that interest. Because fracturing involves uncertain parameters; ranging from reservoir...

Summary Optimal acid-injection rate is critical information for carbonate-matrix-acidizing design. This currently obtained through fitting acidizing-coreflood experimental results. A model needed to predict optimal rates various reservoir conditions. wormhole forms when larger pores grow in the cross-sectional area at a that greatly exceeds growth of smaller caused by surface reaction. happens pore follows particular mechanism, which discussed this paper. We have developed wormhole-growth...

Summary Downhole temperature data that are measured by production logging tools (PLTs) or fiber-optic distributed-temperature sensors used frequently today to diagnose multistage fracture treatments in horizontal highly deviated wells. These data, at the wellbore during fracturing and post-fracture, provide important transient-flow information helps engineers understand process of performance fractured wells, optimize design. The interpretation models developed translate flow conditions can...