A study on development effect of horizontal well with SRV in unconventional tight oil reservoir

Wang, H.; Li, Xinwei; Lü, Ning; Cai, Zhixiang; Liao, Chang Lin; Dou, Xiangji

doi:10.1016/j.joei.2014.03.015

Cited by 52 publications

(24 citation statements)

References 5 publications

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“…The development of tight oil reservoirs has mainly focused on the combination of horizontal wells and volume fracturing [12][13][14]. A large number of cracks occurs after reservoir volume fracturing [15][16][17][18], and waterflood development often results in a rapid outlet of water from the oil wells [19]. Therefore, the current volume transformation is mainly based on natural energy development [20].…”

Section: Introductionmentioning

confidence: 99%

Waterflooding Huff-n-puff in Tight Oil Cores Using Online Nuclear Magnetic Resonance

et al. 2018

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Given the difficulty in developing waterflooding in tight oil reservoirs, using waterflooding huff-n-puff is an effective method to improve oil recovery. Online nuclear magnetic resonance (NMR) can detect the change in internal oil and water during the core displacement process, and magnetic resonance imaging (MRI) in real time. To improve the tight oil reservoir development effectiveness, cores with different permeability were selected for a waterflooding huff-n-puff experiment. Combined with online NMR equipment, the fluid saturation, recovery rate, and residual oil distribution were studied. The experiments showed that, for tight oil cores, more than 80% of the pores were sub-micro-and micro-nanopores. More than 77.8% of crude oil existed in the sub-micro-and micropores, and movable fluids mainly existed in the micropores with a radius larger than 1 µm. The NMR data and the MRI images both demonstrated that the recovery ratio of waterflooding after waterflooding huff-n-puff was higher than that of conventional waterflooding, and, therefore, residual oil was lower. Choosing two cycles' of waterflooding, huff-n-puff was more suitable for tight oil reservoir development. The production of crude oil increased by 22.2% in the field pilot test, which preliminarily proved that waterflooding huff-n-puff was suitable for tight oil reservoirs.

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Section: Introductionmentioning

confidence: 99%

Waterflooding Huff-n-puff in Tight Oil Cores Using Online Nuclear Magnetic Resonance

et al. 2018

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“…Horizontal drilling and multi-stage hydraulic fracturing are the key technologies for exploiting the tight oil to enable economic production [5][6][7]. However, the production of tight oil is rapidly decreasing, and the elasticity recovery efficiency is low [8]. Spontaneous imbibition (SI) of water into a tight oil reservoir is considered an effective way to improve tight oil recovery [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Nuclear Magnetic Resonance Measurement of Oil and Water Distributions in Spontaneous Imbibition Process in Tight Oil Reservoirs

Nie

Chen

2018

Energies

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Spontaneous imbibition of water into tight oil reservoirs is considered an effective way to improve tight oil recovery. We have combined testing techniques such as nuclear magnetic resonance, mercury injection capillary pressure, and magnetic resonance imaging to reveal the distribution characteristics of oil and water during the spontaneous imbibition process of tight sandstone reservoir. The experimental results were used to describe the dynamic process of oil–water distribution at the microscopic scale. The water phase is absorbed into the core sample by micropores and mesopores under capillary forces that dry away the original oil phase into the hydraulically connected macropores. The oil phase entering the macropores will drive away the oil in place and expel the original oil from the macropores. The results of magnetic resonance imaging clearly show that the remaining oil accumulates in the central region of the core because a large amount of water is absorbed in the late stage of spontaneous imbibition, and the water in the pores gradually connects to form a “water shield” that blocks the flow of the oil phase. We propose the spontaneous imbibition pathway, which can effectively explain the internal mechanisms controlling the spontaneous imbibition rate. The surface of the core tends to form many spontaneous imbibition pathways, so the rate of spontaneous imbibition is fast. The deep core does not easily form many spontaneous imbibition pathways, so the rate of spontaneous imbibition is slow. This paper reveals the pore characteristics and distribution of oil and water during the spontaneous imbibition process, which is of significance for the efficient development of tight oil.

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“…At present, the commonly used extraction of natural gas from tight reservoirs adopts the technology of the fractured well, which includes the vertical fractured well and the horizontal fractured well. Compared with horizontal well fractured technology, the vertical fractured technology is more economical [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs

et al. 2017

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Abstract:The mathematical model of coupled flow and geomechanics for a vertical fractured well in tight gas reservoirs was established. The analytical modeling of unidirectional flow and radial flow was achieved by Laplace transforms and integral transforms. The results show that uncoupled flow would lead to an overestimate in performance of a vertical fractured well, especially in the later stage. The production rate decreases with elastic modulus because porosity and permeability decrease accordingly. Drawdown pressure should be optimized to lower the impact of coupled flow and geomechanics as a result of permeability decreasing. Production rate increases with fracture half-length significantly in the initial stage and becomes stable gradually. This study could provide a theoretical basis for effective development of tight gas reservoirs.

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A study on development effect of horizontal well with SRV in unconventional tight oil reservoir

Cited by 52 publications

References 5 publications

Waterflooding Huff-n-puff in Tight Oil Cores Using Online Nuclear Magnetic Resonance

Waterflooding Huff-n-puff in Tight Oil Cores Using Online Nuclear Magnetic Resonance

Nuclear Magnetic Resonance Measurement of Oil and Water Distributions in Spontaneous Imbibition Process in Tight Oil Reservoirs

Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs

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