Study of phase behavior and physical properties of a natural gas reservoir with high carbon dioxide content

Chen, Hao; Yang, Shenglai; Zhang, Xiansong; Ren, Xiaobing; Dong, Kai; Liu, Ying; Meng, Zhan; Wang, Lu; Lu, Hao; Ma, Quanzheng

doi:10.1002/ghg.1576

Cited by 13 publications

(4 citation statements)

References 17 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The live oil was recombined using RUSKA-2730 high pressure high temperature visual PVT apparatus produced by Ruska Company (Houston, Texas, USA). More details of the operation procedure to conduct PVT test can be found in previous publications (Chen et al, 2016) [4]. …”

Section: Methodsmentioning

confidence: 99%

“…Reservoir temperature, oil composition, and the purity of injected CO 2 are considered to be the main factors of MMP. Typically, the contaminants are methane, nitrogen, or intermediate hydrocarbons, such as ethane, propane, butane, and H 2 S. In general, the presence of CH 4 or N 2 in CO 2 can greatly increase the CO 2 MMP, while the presence of H 2 S, C 2 H 6 , or intermediate hydrocarbons (such as C 3 , C 4 ) can decrease the CO 2 MMP [3] . In view of the potential gas sources and significant costs of gas separation, production gas re-injection, if near-miscibility could be achieved, is a practical method to develop QHD offshore oilfield.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lower limit of CO2 content for production gas re-injection in an offshore oilfield

Zhang¹,

Chen²,

Li³

et al. 2017

2017 International Conference on Materials Science and Biological Engineering (ICMSBE 2017)

View full text Add to dashboard Cite

Keywords: offshore oilfield, production gas re-injection, lower limit of CO 2 content.Abstract. The discovery of the natural gases with varying CO 2 content (24-90%) on top of the oil reservoir provides big potential for gas flooding in Qinhuangdao oilfield. However, the contamination of the gases, which is mainly methane, greatly limits the promotion of miscible flooding. In this paper, near-miscible flooding was proposed considering the comparative recovery effect as increasingly lab tests and field tests indicated. In this paper, the effect of impurity content in the production gas on the near-miscible interval are studied. The lower limit of CO 2 content for production gas re-injection in the targeted well are determined. It is concluded that CO 2 content higher than 50% can achieve near-miscible flooding.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lower limit of CO2 content for production gas re-injection in an offshore oilfield

Zhang¹,

Chen²,

Li³

et al. 2017

2017 International Conference on Materials Science and Biological Engineering (ICMSBE 2017)

View full text Add to dashboard Cite

show abstract

“…A two-dimensional visual experimental investigation of gas-drive-water was conducted. The experimental apparatus is composed of a displacement system, data acquisition system and visualization system [38][39][40][41]. The schematic of experimental system is presented in Figure 7.…”

Section: Experimental Apparatus and Fluidsmentioning

confidence: 99%

Visual Investigation of the Occurrence Characteristics of Multi-Type Formation Water in a Fracture–Cavity Carbonate Gas Reservoir

et al. 2018

Self Cite

View full text Add to dashboard Cite

It is difficult to investigate the formation process and occurrence states of water in multi-type reservoirs, due to the strong heterogeneity and complex microstructure of the fracture-cavity carbonate gas reservoirs. To date, there is no systematic study on the occurrence characteristics of multi-type formation water, especially through visual observation experiments. In this paper, a new creation method for visual micromodels based on CT scan images and microelectronic photolithography techniques was described. Subsequently, a gas-drive-water visual experiment was conducted to intuitively study the formation mechanism and the occurrence states of formation water. Then, the ImageJ gray analysis method was utilized to quantitatively investigate the gas-water saturation and the proportion of residual water film. Finally, the occurrence characteristics of formation water and its effects on gas seepage flow were comprehensively analyzed. Visual experimental results showed that: the migration processes of natural gas in different types of reservoirs are different; the water in multiple media consists of native movable water and residual water, and residual water is composed of secondary movable water and irreducible water; the residual water mainly occurs in different locations of different reservoirs with the forms of "water film", "water mass", "water column" and "water droplets"; the main influencing factors are capillary force, surface tension, displacement pressure and channel connectivity. Quantitative results reflect that the saturation of movable water and residual water are the parameters related directly to reservoir physical properties, pore structure and displacement pressure-the smaller the size of flow channel, the larger the space occupied by water film; the thickness proportion of water film is increasing exponentially with the channel size; the thickness proportion of water film decreases as the increase of displacement pressure; the thickness proportion of water film is essentially constant when the displacement pressure increases to a certain extent. The conducted visual investigation not only improves our intuitive understanding of the occurrence characteristics of formation water, but also provides a theoretical basis for the efficient development of fracture-cavity gas reservoirs.

show abstract

“…Knowledge of the phase behavior for formation fluid is the key to ensuring the stable and efficient production of the reservoir [15]. Complex phase equilibrium will occur when the gas is injected into the reservoir, such as tertiary oil recovery, CO 2 geological storage, and the gas injection process of the gas storage studied in this article [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Phase Behavior of Condensate Gas and Crude Oil System in Underground Gas Storage

Tang

Min

et al. 2022

Lithosphere

View full text Add to dashboard Cite

The phase behavior of reservoir fluids is crucial for the smooth operation of an underground gas storage (UGS). In this work, three experiments were conducted to investigate the phase behavior of condensate and crude oil systems within different development stages of gas storage in Bohai Bay Basin of eastern China. In stage 1, constant volume depletion (CVD) test was conducted to simulate the interaction of the original condensate gas-live oil system. In stage 2, the phase behavior of a series of mixtures of live oil with 47.5, 58.3, 69.9, and 77.4 mol% of condensate gas was studied by constant composition expansion (CCE) test. In stage 3, a new experiment was designed to study the mass transfer and phase behavior during cyclic injection-production process of the underground gas storage. The results from the CVD test describe the effect of each pressure stage on produced gas composition and equilibrium oil properties in the condensate crude oil system. The results of the CCE test indicate that condensate gas can expand the oil and improve the properties. The results of cyclic injection-production experiment demonstrate that the mass transfer in condensate gas and oil system is a dual mechanism of condensation and vaporization. With the increase of the cycle, the intermediate components of oil phase are enriched and the heavy components decreases. After four cycles, the oil and gas interphase mass transfer reaches dynamic equilibrium. In addition, test results show that multicycle operation is beneficial to improve the oil properties. This work is of great significance to understand the phase transition mechanism of underground gas storage, which provides a basis for other researchers to further update and improve the EOS model.

show abstract

Study of phase behavior and physical properties of a natural gas reservoir with high carbon dioxide content

Cited by 13 publications

References 17 publications

Lower limit of CO2 content for production gas re-injection in an offshore oilfield

Lower limit of CO2 content for production gas re-injection in an offshore oilfield

Visual Investigation of the Occurrence Characteristics of Multi-Type Formation Water in a Fracture–Cavity Carbonate Gas Reservoir

Experimental Investigation of Phase Behavior of Condensate Gas and Crude Oil System in Underground Gas Storage

Contact Info

Product

Resources

About