| TANG Yang,HE Yin,YAO Jia-xin,SUN Peng.#$NPStudy on Erosion and Wear Characteristics of Pressure-controlled Sliding Sleeve for Gas Hydrate Injection and Crushing[J],50(2):254-260, 270 |
| #$NPStudy on Erosion and Wear Characteristics of Pressure-controlled Sliding Sleeve for Gas Hydrate Injection and Crushing |
| Received:March 01, 2020 Revised:December 29, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.02.026 |
| KeyWord:natural gas hydrate pressure-controlled sliding sleeve solid fluidization mining erosion wear erosion rate numerical simulation |
| Author | Institution |
| TANG Yang |
Southwest Petroleum University, Chengdu , China |
| HE Yin |
Southwest Petroleum University, Chengdu , China |
| YAO Jia-xin |
Southwest Petroleum University, Chengdu , China |
| SUN Peng |
Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| In order to study the influence law and main influencing factors of drilling fluid on the erosion and wear of injection & crushing pressure-controlled sliding sleeve during the exploitation of natural gas hydrate, based on the DPM model of Euler-Lagrange algorithm, this paper establishes a numerical analysis model of sliding sleeve erosion and wear to predict the areas where erosion and wear were likely to occur during the use of the pressure-controlled sliding sleeve, and explores the influence of different drilling fluid particle size, inlet liquid velocity, mass flow rate and sealing block position on the erosion and wear process. The erodible area of the pressure-controlled sliding sleeve was three locations:the sealing block surface, the cross flow crossing, and the inner surface. Under the condition of controlling single factor variable, the maximum erosion rate and erosion area of the erosion area increase with the increase of particle size. When the particle size increased from 0.1 mm to 1.1 mm, the average maximum erosion rate of the erodible area increased by 63.4 times, and showed different trends in different particle size sections. As the distance between the sealing block and the sliding sleeve decreased, the average maximum erosion rate of the erodible area increased. When the distance decreased from 50 mm to 5 mm, the average maximum erosion increased by 3.8 times and showed different trends at different distances. At the same time, as the distance between the sealing block and the sliding sleeve decreased, the erosion area of the inner surface decreased significantly, while that of the sealing block and the cross flow crossing was no significant change. With the increase of the inlet flow velocity and the fluid mass flow rate, the maximum erosion rate of the erodible area exhibited an exponential increase. When the flow velocity increased from 6 m/s to 14 m/s, the average maximum erosion rate of the erodible area increased by 9.5 times. When the fluid mass flow rate increased from 0.001 kg/s to 0.007 kg/s, the average maximum erosion rate of the erodible area increased by 5.6 times, but the erosion area did not change significantly. Therefore, the sealing block surface, cross flow crossing and inner surface of sliding sleeve are most prone to erosion damage. The diameter of the erosion particles should be less than 0.3 mm. The distance between the sealing block and the sliding sleeve should be greater than 30 mm. At the same time, the smaller the inlet liquid velocity and mass flow rate, the better the erosion. Based on the analysis of the maximum erosion rate and the multiple of growth, the particle size is the main factor for the increase of the erosion rate, which provides guidance significance for the design and application of the injection & crushing pressure-controlled sliding sleeve. |
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