Study of critical annulus up-returning velocity of cuttings carried by supercritical CO 2 in deviated well

Huo, Hong Jun; Wang, Rui He; Ni, Hong Jian; Li, Yu Xing; Tan, Chunyang; Xue, Sun

doi:10.1016/j.jcou.2017.04.013

Cited by 26 publications

(10 citation statements)

References 10 publications

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“…Considering the low viscosity, the feasibility of SC-CO 2 for carrying cuttings was experimentally and theoretically verified. 202 The results showed that cuttings are difficult to transport when the well angle is between about 601 and 801. Fortunately, the viscosity of SC-CO 2 can easily be increased by adding additives such as the fluoroether disulfate telechelic ionomer, to improve its ability to effectively carry cuttings.…”

Section: Sc-co 2 Based Drillingmentioning

confidence: 99%

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Lyu

Tan

et al. 2021

Energy Environ. Sci.

124

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Section: Sc-co 2 Based Drillingmentioning

confidence: 99%

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Lyu

Tan

et al. 2021

Energy Environ. Sci.

124

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“…Supercritical carbon dioxide (SC‐CO 2 ) fracturing is regarded as a promising means in the development of the unconventional oil and natural gas on account of its great advantages of environmental protection and resource conservation . CO 2 (usually reach a supercritical state when the temperature is higher than 304.1 K and pressure is higher than 7.38 MPa in the fracturing crack in deep wells) is injected into the wells as a fracturing fluid to make cracks in the formation in order to form a flow channel for oil and natural gas from the reservoir to the well in supercritical carbon dioxide fracturing .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, study on temperature field in fracture for supercritical carbon dioxide fracturing is of great importance to the fracturing design . Physical properties of CO 2 (like density, viscosity heat capacity and so on) change with temperature and pressure in a nonlinear manner . As a result, physical properties of CO 2 will change with the effect of flow in crack, heat, and mass transfer with the formation rock in the crack.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of temperature field in crack of supercritical carbon dioxide fracturing

Zhou

Shen

et al. 2020

Energy Science & Engineering

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Supercritical carbon dioxide (SC-CO 2 ) fracturing technology has far-reaching application potential for unconventional resources which is beneficial to water protection and CO 2 sequestration. In this paper, temperature field in the crack of SC-CO 2 fracturing which will affect flow behavior of SC-CO 2 and the carrying capacity for proppants has been studied. A generalized and pragmatic numerical method coupled with the physical properties model of CO 2 and heat and mass transfer in the formation rock has been established to calculate the variations of temperature and density in the crack during fracturing. Porous medium model was used to describe the formation rock which would make the calculation more accurate. Rules of influence distance of the rock with time and injection displacement were analyzed. Distribution of temperature in XY plane is symmetrical, while temperature on the bottom wall is much less than that of the top wall in XZ plane. Decrease in injection temperature and increase in injection displacement will make the temperature of SC-CO 2 lower at the same position which is beneficial to the proppant transportation. Therefore, low injection temperature and high displacement are suggested in the application in order to make a longer proppant bed. Besides, the density of SC-CO 2 is relatively high in the formation of low rock porosity which will make the fracturing more effective.The results obtained in this paper will provide reference for SC-CO 2 fracturing design which could promote the development of this technology.

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“…Carbon dioxide could also effectively dissolve heavy oil components in the pay zone, and benefit the increasing of flow ability . Thus, fracturing with carbon dioxide is believed to have a promising future, and is especially suitable for depleted reservoirs and unconventional reservoirs …”

Section: Introductionmentioning

confidence: 99%

“…12,13 Thus, fracturing with carbon dioxide is believed to have a promising future, and is especially suitable for depleted reservoirs and unconventional reservoirs. 14,15 Field applications by PetroChina at the Changqing Oilfield have shown that 7 the difficulties of carbon dioxide fracturing mainly lie in sand transportation, especially the formation of a sand block near the fracture entrance, which prohibits transportation of fracturing fluid and sand into the fracture from the wellbore. Fracture initiation and propagation are powered by hydraulic pressure at the bottom hole, which introduces the impending demand for a specific understanding of the flow field characters near the fracture entrance.…”

Section: Introductionmentioning

confidence: 99%

Flow field characters near fracture entrance in supercritical carbon dioxide sand fracturing

et al. 2019

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To investigate the flow field near fracture entrance and promote the development of sand fracturing with carbon dioxide as the working fluid, numerical simulation of multiphase flow was conducted with a 3D geological model considering the compressibility of carbon dioxide. The flow field of carbon dioxide alone was firstly investigated to lay the foundation for the analysis of multiphase flow, and then comparative analysis was conducted on the flow field of both the injecting sand from the pipe and the annulus. The results show that jet fracture with carbon dioxide can achieve a 4.46 MPa pressure boost at the fracture tip compared to the annulus pressure, which theoretically validates the feasibility of the mentioned technology. Sand fracturing can achieve a higher pressure boost in the cavity, while it needs greater pump pressure at the surface. Injecting sand from the annulus could decrease the need for pump pressure by 6.62 MPa at the condition of injecting 25% carbon dioxide from the annulus simultaneously, while the pressure difference between the cavity tip and the annulus decreases as a result. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Study of critical annulus up-returning velocity of cuttings carried by supercritical CO 2 in deviated well

Cited by 26 publications

References 10 publications

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Numerical simulation of temperature field in crack of supercritical carbon dioxide fracturing

Flow field characters near fracture entrance in supercritical carbon dioxide sand fracturing

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