Influence of pre-shearing on rheometric measurements of an oil-based drilling fluid

Fernandes, Rubens Rosario; Andrade, Diogo E. V.; Franco, A.; Negrão, Cezar Otaviano Ribeiro

doi:10.1007/s00397-017-1027-y

Cited by 16 publications

(3 citation statements)

References 49 publications

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“…(3) Oscillatory time sweep tests were carried out within the linear viscoelastic region to recover the structure of the coastal mud [42][43][44]. The linear viscoelastic region after the pre-shearing step was also determined using the amplitude sweep test (Figure 3b).…”

Section: Structural Recovery Testsmentioning

confidence: 99%

The Influence of Oscillatory Frequency on the Structural Breakup and Recovery of Coastal Mud

Gu,

Wang,

et al. 2023

JMSE

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The structural breakup and recovery of coastal mud are closely related to wave propagation, mud transportation, and coastal morphology evolution. Due to the influence of climate, topography, and other factors, the wave frequency in marine environments is more variable than fixed. To investigate the mud structural breakup and recovery process under oscillatory shear loads with different frequencies, a series of oscillatory rheological experiments of the coastal mud collected from the tidal flats of Zhairuoshan Island, Zhejiang province, China, were carried out. The results revealed that the structural breakup of coastal mud had a two-step transition process. The fluidization occurs more rapidly at higher frequencies, but the influence of frequency on the two yield stresses is limited. In addition, frequency has a complex effect on the structural recovery of coastal mud. The normalized equilibrium storage modulus (G∞′/G0′) does not change monotonically with frequency. Moreover, the viscosity quickly approaches equilibrium when a shear load is applied. After that, when a low-frequency load is applied, G∞′/G0′ is no longer related to the pre-shear duration. However, when a high-frequency load is applied, G∞′/G0′ of the mud sample pre-sheared for 500 s is significantly larger than that of the sample pre-sheared to the minimum viscosity. This study is anticipated to provide reference and supplementary test data for understanding the interaction between waves of different frequencies and muddy seabed.

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Section: Structural Recovery Testsmentioning

confidence: 99%

The Influence of Oscillatory Frequency on the Structural Breakup and Recovery of Coastal Mud

Gu,

Wang,

et al. 2023

JMSE

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“…Formation water has a high salinity, so the use of low-salinity drilling fluids must be controlled. Based on the analysis of the properties of OBDF and the characteristics of fractured tight sandstone gas reservoirs, OBDF is mainly affected by three aspects: its own natural conditions, the interaction between OBDF and rocks, and the nature of OBDF at the contact surface [31]. The most obvious change in the properties of OBDF is its rheological change; rock actions are mainly divided into physical and chemical actions and the coupling effect; the properties of OBDF at the contact surface are mainly a series of fluid characteristic changes after the OBDF contact with rocks and formation fluids.…”

Section: Geofluidsmentioning

confidence: 99%

Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

2019

Geofluids

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Oil-based drilling fluids (OBDFs) have a strong wellbore stabilization effect, but little attention has been paid to the formation damage caused by oil-based drilling fluids based on traditional knowledge, which is a problem that must be solved prior to the application of oil-based drilling fluid. For ultradeep fractured tight sandstone gas reservoirs, the reservoir damage caused by oil-based drilling fluids is worthy of additional research. In this paper, the potential damage factors of oil-based drilling fluids and fractured tight sandstone formations are analyzed theoretically and experimentally. The damage mechanism of oil-based drilling fluids for fractured tight sandstone gas reservoirs is analyzed based on the characteristics of multiphase fluids in seepage channels, the physical and chemical changes of rocks, and the rheological stability of oil-based drilling fluids. Based on the damage mechanism of oil-based drilling fluids, the key problems that must be solved during the damage control of oil-based drilling fluids are analyzed, a detailed description of formation damage characteristics is made, and how to accurately and rapidly form plugging zones is addressed. This research on damage control can provide a reference for solving the damage problems caused by oil-based drilling fluids in fractured tight sandstone gas reservoirs.

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“…The usage of a great amount of weighting agent will worsen the rheology, filtration loss and wall-building property, and lubricity of the oil-based drilling fluid [15]. The rheological stability of the oil-based drilling fluid with high density used with different types of weighting agent still needs to be studied.…”

Section: Introductionmentioning

confidence: 99%

Rheological properties and damage-control mechanism of oil-based drilling fluid with different types of weighting agents

Tao

et al. 2018

R. Soc. open sci.

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The great amount of solid particles contained in a weighting agent is a major cause of the problems in both rheology properties and damage control mechanism of an oil-based drilling fluid (OBM). Therefore, a proper type of weighting agent can be a solution for the application of OBM. In this study, three weighting agents that have been commonly used with OBM, namely, standard barite, submicron barite and superfine manganese ore, are studied. Rheological properties of OBM and the degree of formation damage are assessed with regard to the three weighting agents. The agents are also studied in aspects of particle size, micromorphology, filtration loss and wall-building property, acid dissolution efficiency of mud cake, lubricity and sedimentation stability to analyse the effects of the agents on rheological properties and the degree of damage as well as to figure out the mechanism of rheology control and damage control. For the OBM, there is a mutual effect between rheological stability and the degree of damage. In consideration of the agents' properties, we can enhance the rheological stability of the OBM and control the degree of formation damage by properly selecting particle size, using acid-soluble materials and forming the mud cake with ultra-low permeability that can easily be cleared away.

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Influence of pre-shearing on rheometric measurements of an oil-based drilling fluid

Cited by 16 publications

References 49 publications

The Influence of Oscillatory Frequency on the Structural Breakup and Recovery of Coastal Mud

The Influence of Oscillatory Frequency on the Structural Breakup and Recovery of Coastal Mud

Damage Mechanism of Oil-Based Drilling Fluid Flow in Seepage Channels for Fractured Tight Sandstone Gas Reservoirs

Rheological properties and damage-control mechanism of oil-based drilling fluid with different types of weighting agents

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