Formation damage mechanisms and protection technology for Nanpu nearshore tight gas reservoir

Xiao-hong, WU; Pu, Hui; Zhu, Ke; Shu-qin, LU

doi:10.1016/j.petrol.2017.07.033

Cited by 30 publications

(14 citation statements)

References 1 publication

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“…The shale pack is an independent experimental equipment design, which is made of 316 L steel with a length of 5.08 cm and an inner diameter of 2.54 cm. The maximum working pressure is 25 MPa. An ultraviolet spectrophotometer from Shimadzu Corporation is used to study the adsorption capacity.…”

Section: Methodsmentioning

confidence: 99%

“…The slick‐water damage directly influences the exploitation of shale reservoirs. Therefore, the overall operation tendency of shale fracturing is to reduce the slick‐water damage to the reservoirs …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the overall operation tendency of shale fracturing is to reduce the slick-water damage to the reservoirs. [23][24][25] The current practice is to reduce the molecular weight of PAM before flowing back. It is believed that a low molecular weight chain is fit to recover the permeability of shale reservoirs.…”

Section: Introductionmentioning

confidence: 99%

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Reduced adsorption of polyacrylamide‐based fracturing fluid on shale rock using urea

Yang

Wang

Guo

et al. 2018

Energy Science & Engineering

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Hydraulic fracturing is generally necessary to achieve economically viable production rates during exploitation of shale reservoirs. Polyacrylamide‐based fracturing fluid is commonly used in shale fracturing. Polyacrylamide (PAM) becomes adsorbed in the shale micro‐fractures, decreasing the permeability of the reservoir. For improving the production of shale after being stimulated, the adsorption behavior and adsorption mechanism between the PAM and shale are studied. An ultraviolet spectrophotometer is used to obtain the amount of adsorption. To observe the adsorption morphology, a scanning electron microscope is employed. The action force between the PAM and shale rock is analyzed through Fourier transform infrared spectroscopy, zeta potential instrument, and X‐ray photoelectron spectroscopy. The results indicate that hydrogen bonding is the key force between the PAM and shale. A kind of shale micro‐fractures model is designed to determine the recovery of permeability. Urea breaks the hydrogen bonding and keeps the molecular of HPG stretch which can decrease the amount of adsorption on the shale surface and effectively recover the permeability of shale micro‐fractures up to 72.46% after being damaged. In conclusion, it is believed that the competitive adsorption is a new approach for remediation of the permeability damage by PAM‐based fracturing fluid and has great potential in oil field application.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reduced adsorption of polyacrylamide‐based fracturing fluid on shale rock using urea

Yang

Wang

Guo

et al. 2018

Energy Science & Engineering

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“…Petroleum plays a vital role in industrial production [1,2]. Many of its advantages are incomparable with other fuels and alternatives cannot be developed in a short time [3,4]. Unfortunately, some crude oils have a high wax content.…”

Section: Introductionmentioning

confidence: 99%

Role of Shearing Dispersion and Stripping in Wax Deposition in Crude Oil Pipelines

Wang

Zhao

et al. 2019

Energies

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Wax deposition during crude oil transmission can cause a series of negative effects and lead to problems associated with pipeline safety. A considerable number of previous works have investigated the wax deposition mechanism, inhibition technology, and remediation methods. However, studies on the shearing mechanism of wax deposition have focused largely on the characterization of this phenomena. The role of the shearing mechanism on wax deposition has not been completely clarified. This mechanism can be divided into the shearing dispersion effect caused by radial migration of wax particles and the shearing stripping effect caused by hydrodynamic scouring. From the perspective of energy analysis, a novel wax deposition model was proposed that considered the flow parameters of waxy crude oil in pipelines instead of its rheological parameters. Considering the two effects of shearing dispersion and shearing stripping coexist, with either one of them being the dominant mechanism, a shearing dispersion flux model and a shearing stripping model were established. Furthermore, a quantitative method to distinguish between the roles of shearing dispersion and shearing stripping in wax deposition was developed. The results indicated that the shearing mechanism can contribute an average of approximately 10% and a maximum of nearly 30% to the wax deposition process. With an increase in the oil flow rate, the effect of the shearing mechanism on wax deposition is enhanced, and its contribution was demonstrated to be negative; shear stripping was observed to be the dominant mechanism. A critical flow rate was observed when the dominant effect changes. When the oil flow rate is lower than the critical flow rate, the shearing dispersion effect is the dominant effect; its contribution rate increases with an increase in the oil flow temperature. When the oil flow rate is higher than the critical flow rate, the shearing stripping effect is the dominant effect; its contribution rate increases with an increase in the oil flow temperature. This understanding can be used to design operational parameters of the actual crude oil pipelines and address the potential flow assurance problems. The results of this study are of great significance for understanding the wax deposition theory of crude oil and accelerating the development of petroleum industry pipelines.

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“…When a workover operation is performed in a reservoir with fractures or dominant percolation channels, in order to prevent the workover fluid entering the reservoir to form a blockage, the temporary plugging agent is used to temporarily block the fractures or the dominant percolation channels [1][2][3]. After the completion of the workover, the temporary plugging agent loses the plugging effect, and the permeability of the fractures and the dominant percolation channels can be restored, so as to realize the protection of the reservoir [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of an Oil-Soluble Polyethylene Wax Particles Temporary Plugging Agent

Li¹,

Qin²,

Li³

et al. 2018

Journal of Chemistry

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In order to solve the problem of low strength, low permeability recovery rate, and narrow suitable temperature range of the oil-soluble temporary plugging agent, the idea of preparing the oil-soluble polyethylene wax particles temporary plugging agent (OPPTA) using polyethylene wax as the main raw material was proposed. Emulsifier and stabilizer were selected, and the dosage of emulsifier, stabilizer, and stirring speed was optimized. The method for preparing OPPTA was formed. The temporary plugging performance of OPPTA for the natural core was studied. The plugging rate and the recovery rate of core permeability after plugging removal of OPPTA were 99.9% and 90.1%, respectively. The temporary plugging performance of OPPTA was better than that of a conventional oil soluble temporary plugging agent W-11.

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Formation damage mechanisms and protection technology for Nanpu nearshore tight gas reservoir

Cited by 30 publications

References 1 publication

Reduced adsorption of polyacrylamide‐based fracturing fluid on shale rock using urea

Reduced adsorption of polyacrylamide‐based fracturing fluid on shale rock using urea

Role of Shearing Dispersion and Stripping in Wax Deposition in Crude Oil Pipelines

Preparation and Performance of an Oil-Soluble Polyethylene Wax Particles Temporary Plugging Agent

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