A quantitative oil and gas reservoir evaluation system for development

Rui, Zhenhua; Lu, Jun; Zhang, Zhien; Guo, Rui; Ling, Kegang; Zhang, Ronglei; Patil, Shirish

doi:10.1016/j.jngse.2017.02.026

Cited by 133 publications

(41 citation statements)

References 31 publications

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“…High cost is usually involved in the development of oil and gas projects, especially for offshore projects (Rui et al 2017a(Rui et al , b, c, 2018. Lost circulation is a major costly incident in the drilling and completion phases.…”

Section: Comparison With Fracture-bridging Wellbore Strengthening Methodsmentioning

confidence: 99%

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

Feng

Gray

2018

Pet. Sci.

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Although a large volume of mudcake filtration test data is available in the literature, effects of mudcake on wellbore strengthening cannot be quantified without incorporating the data into a stress-analysis model. Traditional models for determining fracture initiation pressure (FIP) either consider a wellbore with an impermeable mudcake or with no mudcake at all. An analytical model considering permeable mudcake is proposed in this paper. The model can predict pore pressure and stress profiles around the wellbore, and consequently the FIP, for different mudcake thickness, permeability, and strength. 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 nearwellbore region, rather than by mudcake strength. Fluid loss pressure (FLP) should be distinguished from FIP when a mudcake is present on the wellbore wall. Fracture may occur behind the mudcake at FIP without mudcake rupture. The small effect of mudcake strength on FIP does not mean its effect on FLP is small too. Mudcake strength may play an important role in maintaining integrity of the wellbore once a fracture has initiated behind the mudcake.

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Section: Comparison With Fracture-bridging Wellbore Strengthening Methodsmentioning

confidence: 99%

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

Feng

Gray

2018

Pet. Sci.

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“…Production rates in tight reservoirs decline quickly after a short period of high production [18]. How to effectively evaluate production performance has become a significant challenge [19][20][21]. Production logging tests (PLTs) are an effective tool to measure the downhole production profile.…”

Section: Introductionmentioning

confidence: 99%

An Improved Rate-Transient Analysis Model of Multi-Fractured Horizontal Wells with Non-Uniform Hydraulic Fracture Properties

Cheng

Rui

et al. 2018

Energies

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Although technical advances in hydraulically fracturing and drilling enable commercial production from tight reservoirs, oil/gas recovery remains at a low level. Due to the technical and economic limitations of well-testing operations in tight reservoirs, rate-transient analysis (RTA) has become a more attractive option. However, current RTA models hardly consider the effect of the non-uniform production on rate decline behaviors. In fact, PLT results demonstrate that production profile is non-uniform. To fill this gap, this paper presents an improved RTA model of multi-fractured horizontal wells (MFHWs) to investigate the effects of non-uniform properties of hydraulic fractures (production of fractures, fracture half-length, number of fractures, fracture conductivity, and vertical permeability) on rate transient behaviors through the diagnostic type curves. Results indicate obvious differences on the rate decline curves among the type curves of uniform properties of fractures (UPF) and non-uniform properties of fractures (NPF). The use of dimensionless production integral derivative curve magnifies the differences so that we can diagnose the phenomenon of non-uniform production. Therefore, it's significant to incorporate the effects of NPF into the RDA models of MFHWs, and the model proposed in this paper enables us to better evaluate well performance based on long-term production data.

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“…In the US, 51% of crude oil production and 67% of natural gas production came from the hydraulically fractured wells in 2015 [1][2][3]. To fracture the formation, a large volume of water is injected to create a fracture network that provides pathways for hydrocarbon to flow [4][5][6][7][8]. In recent years, fracturing experience from various fields indicates that the larger the volume of water used per well, the more complex the created fracture network, and thus the higher the initial hydrocarbon production rate [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on Fluid-Rock Interaction and Reuse of Flowback Fluid for Gel Fracturing in Desert Area

et al. 2018

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Hydraulic fracturing requires a large volume of fresh water, which is difficult and expensive to obtain in the desert area such as Tarim Basin. Currently, flowback fluid is typically transported to the sewage treatment plant and then discharged after reaching environmental requirements; however, this is not only costly, but also a waste of water resource. Therefore, it is imperative to understand the potential interactions between fracturing fluid and reservoir rock, and then find solutions to reuse the flowback water for subsequent fracturing. In this study, once flowback fluid was directly collected from the field, its chemical compositions were analyzed; then, filtering, decoloring, and chelating methods were chosen to effectively remove or shield the unfavorable reintroduced components. Moreover, pH value was further tuned during different stages of the recycling process to ensure good gelation and cross-linking properties of guar. Cross-linked guar synthesized with the flowback fluid was evaluated in the lab through shear resistance tests and coreflood tests under the reservoir conditions; results indicated the recycled gel behaved similarly as the original gel, or even better. From this work, a cheap and effective treatment process was proposed to reuse the flowback fluid in the desert area.

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A quantitative oil and gas reservoir evaluation system for development

Cited by 133 publications

References 31 publications

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

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

An Improved Rate-Transient Analysis Model of Multi-Fractured Horizontal Wells with Non-Uniform Hydraulic Fracture Properties

Study on Fluid-Rock Interaction and Reuse of Flowback Fluid for Gel Fracturing in Desert Area

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