A novel inversion approach for fracture parameters and inflow rates diagnosis in multistage fractured horizontal wells

Luo, Hongwen; Li, Haitao; Tan, Yamin; Li, Ying; Jiang, Beibei; Lu, Yu; Cui, Xiaojiang

doi:10.1016/j.petrol.2019.106585

Cited by 14 publications

(5 citation statements)

References 18 publications

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“…Hydraulic fracturing has been regarded as a major technique helping stimulate the oil and gas reservoirs. − During a hydraulic fracturing process, sand-carrying fluid is pumped into the well bore to propagate induced fractures in the formation. − Multistage fracturing and horizontal drilling are the major techniques applied in the stimulation of unconventional reservoirs such as tight sand and shale, which are hard to develop with economic benefits by normal ways due to the ultralow permeability and low porosity. − The engineering pattern of stage-by-stage simultaneous fracturing with multiple perforation clusters has been seen as a critical stimulation method and has been proven functioning better than that with one cluster per stage in enhancing the flow abilities of oil and gas in unconventional reservoirs. , However, there is evidence indicating an attendant problem that the profile of the inflow rates of multiple perforation clusters turns out to be nonuniform due to the poor fracture propagation uniformity, which causes the low utilization ratio of perforations and massively blocks the production potential of one fractured horizontal well. − Miller et al’s study indicates that only about 20% of the clusters contribute to the 80% of the total production by acquiring and interpreting the production logs from more than 100 horizontal shale wells in multiple basins. Coincidentally, Cipolla et al drew a similar conclusion with that above by reviewing production logs for over 100 horizontal shale-gas wells, in which less than 30% of the perforation clusters produces the most of the gas and 40% or more of the clusters are nonproductive.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Application of Perforation Optimization Method on Shale Gas Horizontal Well with Numerical Simulation of Multicluster Fracturing under Dense-Segment Pattern

Liu,

Li,

Luo

et al. 2023

ACS Omega

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Multicluster fracturing of horizontal wells has evolved into a mature and widely adopted technique for exploiting unconventional oil and gas fields. A well-designed multicluster completion strategy can yield an ideal fracturing outcome, significantly enhancing production rates and potentially delivering substantial economic benefits. Nevertheless, empirical evidence suggests that fractured horizontal wells frequently exhibit pronounced nonuniform production profiles, a prevalent issue stemming from the irregular geometry of propagated fractures. This issue critically constrains production rates. To mitigate the adverse effects of low-uniformity fracture propagation, it is imperative to elucidate the factors influencing uniformity levels and their corresponding patterns. Despite extensive discussions on hydraulic fracture propagation mechanisms and optional factors in hydraulic fracturing engineering, there exists a notable oversight regarding the optimization of perforation parameters to achieve improved fracturing uniformity during well completion procedures. This paper introduces an optimization method for perforation parameters based on a fully coupled pseudo-3D numerical model of multicluster fracturing. The impact patterns of cluster spacing, perforation number, and initial perforation diameter on multifracture propagation results and uniformity levels are thoroughly examined. The multicluster fracturing model, developed using the displacement discontinuous method (DDM), is coupled with material balance, pressure transmission, hole erosion computation, and initiation asynchrony estimation. To quantify the uniformity level of the fracturing result, the modified propagation uniformity index (U fm ) is employed. Simulation results from 20 cases are categorized into six groups based on varied changing patterns of perforation parameters, leading to the identification of five recommendations for optimizing perforation parameters. By implementation of the discussed optimized perforation parameters, successful fracturing outcomes were realized.

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Section: Introductionmentioning

confidence: 99%

Investigation and Application of Perforation Optimization Method on Shale Gas Horizontal Well with Numerical Simulation of Multicluster Fracturing under Dense-Segment Pattern

Liu,

Li,

Luo

et al. 2023

ACS Omega

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“…The distributed optical fiber-based downhole temperature measurement technology (DTS) is gradually being applied to the downhole dynamic monitoring of oil and gas wells [1,2]; DTS technology can identify artificial fractures [3], determine the fluid type [4], assess the effects of fracturing reconstruction [5], and quantitatively interpret the production profile, fracture flow contribution, and fracture parameters of fracturing horizontal wells [6][7][8], particularly for horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence Law of Temperature Profile of Vertical Wells in Gas Reservoirs

Hansong

Luo

et al. 2022

Int. J. Petrol. Technol.

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Due to the lack of a robust temperature model and poor knowledge about the influence law of temperature profile, it is still highly challenging to interpret the production profile of vertical wells in layered gas reservoirs from distributed temperature sensing (DTS) quantitatively. In this paper, a coupled temperature prediction model for vertical wells in the layered gas reservoir is developed, considering several microthermal effects and non-isothermal seepage. Based on the theoretical simulation, several single factors' influence on the vertical well's temperature profile in a layered gas reservoir has been analyzed. The sensitivity of temperature profiles on different affecting factors has been evaluated through orthogonal test analysis. It has been found that the influence degree of each factor on the temperature profile of the vertical well in the layered gas reservoir is as follows: formation permeability > production rate >water saturation > wellbore inclination angle > relative density of natural gas > formation thermal conductivity > wellbore diameter (k >Qg > SW > θ > dg > Kt > D). The dominant factors affecting the temperature profile of vertical wells in layered gas reservoirs are formation permeability, production rate, and water saturation. The proposed temperature prediction model can serve as the forward model when developing the inversion system to interpret DTS measurement. The findings of this paper provide solid theoretical support for the quantitative interpretation of the flow rate profile for vertical wells in layered gas reservoirs.

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“…At present, a few studies have proposed that the numerical simulation method can be used to predict the inflow profile; however, the numerical simulation model requires a lot of reservoir parameters, which impacts the accuracy of the prediction results. , The conventional production logging tool is the most successful inflow profile testing method, but there are still some limitations of this approach . For instance, the technology involves a one-time test that cannot be monitored over a long period and the requirement of a well-like structure that allows the test instrument to be run within the annulus makes it unsuitable for different types of horizontal wells. , The distributed temperature sensing is a newly developed technology that can monitor the real-time inflow profile . However, due to the lack of accurate inversion approaches and the temperature measurement performance of fiber, it is difficult to accurately monitor the inflow profile .…”

Section: Introductionmentioning

confidence: 99%

“…8,9 The distributed temperature sensing is a newly developed technology that can monitor the real-time inflow profile. 10 However, due to the lack of accurate inversion approaches and the temperature measurement performance of fiber, it is difficult to accurately monitor the inflow profile. 11 The chemical tracer is an efficient monitoring technology with many useful applications in the oil and gas industry, including evaluation of the remaining oil saturation, waterflood optimization, and improving reservoir characterization, fluid pathways, and connectivity between wells.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Release Mechanism of Sustained-Release Tracers and its Application in Horizontal Well Inflow Profile Monitoring

Liu

et al. 2021

ACS Omega

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The inflow profile is an important parameter to evaluate horizontal well productivity; however, quantitative interpretation of the inflow profile of the horizontal wells both accurately and cost-effectively is a common challenge faced by horizontal well production technology. The sustained-release chemical tracer is a new low-cost, long-lasting, and simple technique for monitoring the inflow profile in horizontal wells. In this study, a new type of sustained-release tracer is developed using bisphenol A-type epoxy resin as the polymer matrix and 2,6-difluorobenzoic acid, 3,4-difluorobenzoic acid, and 2,3,4,5-tetrafluorobenzoic acid as tracers. Meanwhile, the release mechanism and the influencing factors (chemistry of the tracer, temperature, salinity, and flow rate) of the sustained-release tracer are studied experimentally. The experimental results show that the release mechanism of the sustained-release tracer can be divided into two stages. The first stage involved the erosion process, in which the fluid gradually contacts and wraps the tracer, and the release rate is very fast. The second stage included the diffusion process, which is the diffusion–dissolution process once the fluid is completely wrapped around the tracer, and the release rate of this process is slow. The temperature is directly proportional to the release rate of the tracer, whereas salinity is inversely proportional to the release rate, and the fluid velocity does not affect the release rate. Finally, three kinds of sustained-release tracers are applied in the field, and a method to interpret the inflow profile of the sustained-release tracer is proposed. The result of application indicates that the sustained-release tracer developed in this study can efficiently monitor the inflow profile of the horizontal well.

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A novel inversion approach for fracture parameters and inflow rates diagnosis in multistage fractured horizontal wells

Cited by 14 publications

References 18 publications

Investigation and Application of Perforation Optimization Method on Shale Gas Horizontal Well with Numerical Simulation of Multicluster Fracturing under Dense-Segment Pattern

Investigation and Application of Perforation Optimization Method on Shale Gas Horizontal Well with Numerical Simulation of Multicluster Fracturing under Dense-Segment Pattern

Study on the Influence Law of Temperature Profile of Vertical Wells in Gas Reservoirs

Evaluation of the Release Mechanism of Sustained-Release Tracers and its Application in Horizontal Well Inflow Profile Monitoring

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