| WANG Chen-long,WANG Jie,JING Xin,QIAO Lei,HE Ai-guo,LIU Yi-shan,TANG Yang.Simulation Study on Erosion Law of Wellhead Equipment in Underground Coal Gasification Production Well[J],52(5):101-110, 130 |
| Simulation Study on Erosion Law of Wellhead Equipment in Underground Coal Gasification Production Well |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.010 |
| KeyWord:underground coal gasification wellhead equipment erosion numerical simulation |
| Author | Institution |
| WANG Chen-long |
CNPC Engineering Technology R&D Company Limited, Beijing , China |
| WANG Jie |
School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu , China |
| JING Xin |
School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu , China |
| QIAO Lei |
CNPC Engineering Technology R&D Company Limited, Beijing , China |
| HE Ai-guo |
CNPC Engineering Technology R&D Company Limited, Beijing , China |
| LIU Yi-shan |
CNPC Engineering Technology R&D Company Limited, Beijing , China |
| TANG Yang |
School of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu , China |
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| Abstract: |
| Underground coal gasification is a new type of coal mining technology, which is used to burn underground coal resources into crude gas (in which, the main component is methane, etc.). With the increasing development of UCG technology, it is imperative to demonstrate the application of on-site engineering, and it is imminent to solve the problems encountered in production of its equipment. During the use of the UCG gas production wellhead equipment, the high-speed crude gas produced will carry a large amount of solid particles, which may cause serious erosion to the gas production channel of the wellhead equipment and affect the structural strength of the wellhead equipment. In this paper, the erosion model of the high temperature production wellhead equipment was established, and the erosion law of the wellhead equipment by the crude gas with different physical properties was analyzed. And the erosion experimental program was designed to verify the numerical simulation results. The CFD model was coupled with the DPM numerical method to predict the movement of solid particles such as coal ash in the gas flow field. On this basis, numerical simulation was carried out for the effects of particle size, particle mass flow rate and flow rate of crude gas on the erosion of the wellhead equipment. The following conclusions were drawn from numerical simulations:(1) The areas where the solid particles eroded the wellhead equipment most seriously were the inner wall surface of the small four-way and the upper wall surface of the side valve I. (2) As the particle size of the solid particles increased, the maximum erosion rate first increased and then decreased, but when the particle size exceeded the critical value (160 μm), the maximum erosion rate was gradually reduced by the impact of the particle size, and the change trend of the maximum erosion rate gradually eased. At the inner wall of the small four-way, the maximum erosion rate was the largest when the particle size was 40 μm, which was 8.7×10–7 kg/(m2.s), which was 11.9 times that when the particle size was 180 μm. (3) As the mass flow of solid particles increased, the erosion area and the maximum erosion rate gradually increased, and the maximum erosion rate on the small four-way was approximately proportional to the particle mass flow. When the mass flow rate was 12.5×10–4 kg/s, the maximum erosion rate was 7.3×10–7 kg/(m2.s), which was 5.2 times that when the mass flow rate was 2.5×10–4 kg/s. (4) As the flow rate of crude gas increased, the erosion area and maximum erosion rate increased significantly with the increase of the flow rate. When the crude gas flow rate was 20 m/s, the maximum erosion rate was 6.7×10–7kg/(m2.s), which was 2.7 times that when the crude gas flow rate was 10 m/s. Through the erosion experiment, it was found that the erosion rate is the largest when the erosion angle was 20° and 30°, which further verified the correctness of the numerical simulation analysis on the prediction of the severe erosion area. Through experiments, it is found that the surfacing treatment can effectively reduce the erosion of the gas-solid two-phase flow on the wellhead equipment. During the processing of the wellhead equipment, the key erosion areas should be surfacing, and in the process of the UCG project, the small spool and side valve I should be monitored to prevent these key erosion areas from being worn to a dangerous thickness. By establishing the erosion simulation model and erosion experiment plan of the gas production channel of the UCG wellhead device, the erosion law of the gas production channel of the wellhead device can be studied, which can effectively guide the design and processing of the wellhead device. |
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