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Chen Y, Sang Y, Guo J, Yang J, Chen W, Tang B, Feng F, Gou X, Zhang Y. Experimental Study on the Backflow Mechanism of Proppants in Induced Fractures and Fiber Sand Control Under the Condition of Large-Scale and Fully Measurable Flow Field. ACS OMEGA 2023; 8:42467-42478. [PMID: 38024756 PMCID: PMC10652366 DOI: 10.1021/acsomega.3c05030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 10/07/2023] [Accepted: 10/11/2023] [Indexed: 12/01/2023]
Abstract
The proppant backflow in the process of flowback has a great significant effect on gas field development. Therefore, the study of proppant backflow is of great significance for the development and production of gas wells. At present, the physical simulation methods for proppant backflow mainly include the tube perforation model, the slot model, an API standard flow tester, and a large-scale flowback apparatus. The current experimental methods are unable to observe the backflow of proppants during the process of the flowback test. In addition, the only characterization parameter for proppant backflow is the liquid flow rate corresponding to the sand discharge in the diversion chamber called critical velocity, which is too simple and single to accurately characterize the movement state of proppants during the flowback process. In this paper, a physical simulation method of proppant backflow in fractures based on the measurement of flow field was proposed. It can realize the observation and fine description of the proppant backflow state and movement rule. In addition, the process of proppant backflow can be quantitatively described by a multidimensional characterization parameter. The research shows that (1) the proppant backflow is closely related to the shape of the sand bank formed during the proppant placement and the irregular voids formed; (2) the fiber increases the strength of the proppant pack significantly; (3) the critical velocity with fiber increased by 2.25 times compared with the critical velocity without fiber, the optimum fiber concentration was 0.8%, and the fiber length was 12 mm; (4) the full fiber injection was selected as the best injection mode by the experiment; and (5) the whole process of flowback can be divided into two stages. In the strong fluid shear stage, the effect of fiber sand control is more significant. However, when the flowback enters the stage of slow erosion, the difference in the sand control effect under different parameters is no longer significant.
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Affiliation(s)
- Yixin Chen
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Yu Sang
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Jianchun Guo
- Southwest
Petroleum University, No. 8 Xindu Road, Xindu District, Chengdu, Sichuan 610500, China
| | - Jian Yang
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Weihua Chen
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Botao Tang
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Feng Feng
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Xinghao Gou
- PetroChina
Southwest Oil and Gas Field Company, No. 3, Section 1, Fuqing Road,
Chenghua District, Chengdu, Sichuan 646002, China
| | - Yifan Zhang
- Southwest
Petroleum University, No. 8 Xindu Road, Xindu District, Chengdu, Sichuan 610500, China
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Su J, Zhou C, Ren G, Qiao Z, Chen Y. Improving biomass mixture separation efficiency in multiple inclined channels of gas–solid fluidized bed: CFD-DEM simulation and orthogonal experiment. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.118066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Hydrophobic Antiwetting of Aquatic UAVs: Static and Dynamic Experiment and Simulation. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12157626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The adhesion of water to the surfaces of unmanned aerial vehicles (UAVs) adversely affects the function. The proposed UAVs will have underwater as well as flight capability, and these aquatic UAVs must shed water to resume flight. The efficient separation of the adhering water from aquatic-UAV surfaces is a challenging problem; we investigated the application of hydrophobic surfaces as a potential solution. Using aquatic-UAV models, one with hydrophilic surfaces and the other with superhydrophobic anisotropic textured surfaces, the antiwetting mechanism of the hydrophobic surfaces was investigated using a simulated-precipitation system and instrumentation to measure the load of the water adhering to the aquatic UAV, and to measure the impact energies. When the model was stationary (passive antiwetting), no adhesion occurred on the superhydrophobic surfaces, while continuous asymmetric thick liquid films were observed on the hydrophilic surfaces. The superhydrophobic surfaces reduced the rain loading by 87.5%. The vibration and movement of the model (dynamic antiwetting, simulating flight motions) accelerated the separation process and reduced the contact time. The observed results were augmented by the use of computational fluid dynamics with lattice Boltzmann methods (LBM) to analyze the particle traces inside the droplets, the liquid phase velocity-field and pressure-field strengths, and the backward bouncing behavior of the derived droplet group induced by the moving surface. The synergy between the superhydrophobic surfaces and the kinetic energy of the droplets promotes the breakup of drops, which avoids the significant lateral unbalance observed with hydrophilic surfaces during simulated flight.
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Abduljabbar A, Mohyaldinn ME, Younis O, Alghurabi A, Alakbari FS. Erosion of sand screens: A review of erosion prediction modelling approaches. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Zhao Y, Wang C, Shi X, Gao J, Lan X. Gas-solid flow characteristics in turbulent fluidized bed with variable gas velocity. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Wang M, Liu J, Wang X, Yan X, Yao L, Yue Q. Automatic determination of coupling time step and region in unresolved DEM-CFD. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Li M, Chen H, Lin J, Zhang R, Liu L. Effects of the pore shape polydispersity on the percolation threshold and diffusivity of porous composites: Theoretical and numerical studies. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.03.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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