Determination of Rock-Breaking Performance of High-Pressure Supercritical Carbon Dioxide Jet

Du, Yao; Wang, Ruihe; Ni, Hongjian; Li, Mukun; Song, Weiqiang; Song, Huifang

doi:10.1016/s1001-6058(11)60277-1

Cited by 61 publications

(60 citation statements)

References 5 publications

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“…Additionally, it can also be observed that the size of the erosion pit increases first and then decreases with the increasing standoff distance, and the maximum size can be achieved at the standoff distance of 3 and 4 for the convergent nozzle and the other two Laval nozzles, respectively. This is because, with the increase of standoff distance, the diameter of the jet beam increases while the energy of the jet declines [9]. Moreover, the macroscopic appearances of eroded specimens are in good agreement with the results of rock erosion by jets in previous related articles [15,39], indicating the reliability of this experiment.…”

Section: Resultssupporting

confidence: 85%

“…As for the specimen, an artificial core, which has been used by many investigators for evaluating the intensity of various jet erosion [9,12,22,23,38,39], was employed for the tests because of its relatively perfect homogeneity and moderate hardness. The artificial core was made of cement, quartz sand and water in a 1/2/0.5 mass ratio.…”

Section: Methodsmentioning

confidence: 99%

“…This is due to the fact that with the growth of fluid temperature the diffusivity of the SC-CO2 fluid increases. What is more, the increase of diffusivity is very significant when the temperature increases from a liquid temperature to a supercritical temperature, which results in the obvious enhancement of erosion ability of the SC-CO2 jet when the temperature increases from 290 to 310 K [9,11]. Moreover, compared with the commonly used convergent nozzle, the use of Laval-1 nozzle increases the rock erosion volume by 12.5%, 21.8%, and 26.7%, respectively, corresponding to fluid temperature of 310, 330, and 350 K, respectively; while the employ of Laval-2 nozzle increases the erosion volume by 37.2%, 49.2%, and 53.7%, respectively.…”

Section: Effect Of Nozzle Configuration Under Different Inlet Pressuresmentioning

confidence: 99%

“…To make better use of SC-CO 2 fluid in the field of oil and gas development, different kinds of technologies using SC-CO 2 fluid have been invented, like SC-CO 2 flooding, SC-CO 2 fracturing, SC-CO 2 coiled tubing drilling, SC-CO 2 jets, and so on. Among them, the SC-CO 2 jet, which can be more efficient in eroding rocks than the water jet under the same conditions, has been the subject of numerous studies [9][10][11][12][13][14][15][16][17][18]. The most attractive point of this novel jet technology is that by taking full advantage of the high diffusivity of SC-CO 2 , it can produce an effective jet with a strong ability to erode rock without using any devices for increasing the inlet pressure in the drilling systems.…”

Section: Introductionmentioning

confidence: 99%

“…Then, based on this study, to make a better use of the SC-CO 2 jet by maximally enhancing the erosion capability, many researchers are focusing on the rock erosion characteristics, jet types, and flow field of the SC-CO 2 jet as well as the impacting characteristics, aiming at optimizing the operating conditions and revealing the rock erosion mechanism. For instance, an experimental study was performed by Du et al [9] to understand the relationship of the rock erosion performance of the SC-CO 2 jet with the various influencing factors by the use of a well-designed experimental setup. They concluded that there exist optimal standoff distance and nozzle diameter to achieve the strongest rock erosion capability for the SC-CO 2 jet.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Nozzle Configuration on Rock Erosion Under a Supercritical Carbon Dioxide Jet at Various Pressures and Temperatures

et al. 2017

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Abstract:The supercritical carbon dioxide (SC-CO 2 ) jet offers many advantages over water jets in the field of oil and gas exploration and development. To take better advantage of the SC-CO 2 jet, effects of nozzle configuration on rock erosion characteristics were experimentally investigated with respect to the erosion volume. A convergent nozzle and two Laval nozzles, as well as artificial cores were employed in the experiments. It was found that the Laval nozzle can enhance rock erosion ability, which largely depends on the pressure and temperature conditions. The enhancement increases with rising inlet pressure. Compared with the convergent nozzle, the Laval-1 nozzle maximally enhances the erosion volume by 10%, 21.2% and 30.3% at inlet pressures of 30, 40 and 50 MPa, respectively; while the Laval-2 nozzle maximally increases the erosion volume by 32.5%, 49.2% and 60%. Moreover, the enhancement decreases with increasing ambient pressure under constant inlet pressure or constant pressure drop. The growth of fluid temperature above the critical value can increase the enhancement. In addition, the jet from the Laval-2 nozzle with a smooth inner profile always has a greater erosion ability than that from the Laval-1 nozzle.

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Section: Resultssupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Effect Of Nozzle Configuration Under Different Inlet Pressuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Nozzle Configuration on Rock Erosion Under a Supercritical Carbon Dioxide Jet at Various Pressures and Temperatures

et al. 2017

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Phase state variations for supercritical carbon dioxide drilling

Wang

Sun

et al. 2015

Greenhouse Gases

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A phase state prediction model during supercritical carbon dioxide (SC‐CO2) drilling is established, considering the enthalpy changes caused by the flow work variations and changes in kinetic energy, as well as the potential energy caused by the fluid velocity along with physical property variations. The results show that variations in the flow work affect the temperature field of the SC‐CO2 fluid significantly. Phase state transitions of the fluid in the drill pipes and the annulus exist; in this example, the depth of the phase transition point in the drill pipes is in the range of 600 to 1000 m, while in the annulus, it is in the range of 400 to 700 m. Different results are observed when the phase state prediction is conducted by adjusting the discharge capacities, injecting temperature and pressure. When the discharge capacity is increased, the phase transition points in the drill pipes and the annuluses move downward; the pressure of the bit nozzle upstream increases gradually, while the pressure of the bit nozzle downstream changes slightly. When the wellhead back pressure is increased, the depths of the phase transition points in the drill pipes and the annulus decrease. Moreover, the pressure variations of the bit nozzle upstream and downstream can be divided into two stages: the fast growth stage and the slow growth stage. When the injection temperature is increased, the depths of the phase transition points in the drill pipes and the annulus are reduced; the temperature drop and the pressure drop at the nozzle change slightly. © 2015 Society of Chemical Industry and John Wiley & Sons, Ltd

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Wellbore flow field of coiled tubing drilling with supercritical carbon dioxide

Song

Wang

et al. 2017

Greenhouse Gases

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To achieve better well control for supercritical carbon dioxide drilling, a mathematical model was presented to investigate the pressure and temperature profile in both the tubing and the annulus. The closed model fully couples the hydraulics, heat transfer, and compressibility of carbon dioxide, and then the wellbore flow field is presented and analyzed based on field application. The results show that the pressure change of carbon dioxide is 36.7% smaller than that of water along the annulus in the study case. Carbon dioxide changes into supercritical state when the depth equals 700 m ∼830 m in the tubing, and it could maintain in supercritical state in the whole annulus. Both the pressure profile and the temperature profile are highly coupled with the physical properties of carbon dioxide. The density of carbon dioxide is large enough to drive downhole motors and its capacity is much larger than that of air in the wellbore. The pressure increases lightly with increasing mass flow rate in the annulus; however, it is significantly and positively impacted by the outlet pressure. The influence of outlet pressure on temperature profile is negligible in the tubing. The inlet temperature could not impact the pressure profile in the annulus, and its influence on temperature profile mainly lies in the shallow section of the tubing. It is newly validated that supercritical carbon dioxide drilling is more suitable for the exploitation of unconventional reservoirs with narrow pressure windows. The results could lay a theoretical foundation for practical application. © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Determination of Rock-Breaking Performance of High-Pressure Supercritical Carbon Dioxide Jet

Cited by 61 publications

References 5 publications

Effects of Nozzle Configuration on Rock Erosion Under a Supercritical Carbon Dioxide Jet at Various Pressures and Temperatures

Effects of Nozzle Configuration on Rock Erosion Under a Supercritical Carbon Dioxide Jet at Various Pressures and Temperatures

Phase state variations for supercritical carbon dioxide drilling

Wellbore flow field of coiled tubing drilling with supercritical carbon dioxide

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