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Effects of water invasion law on gas wells in high temperature and high pressure gas reservoir with a large accumulation of water-soluble gas
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.jngse.2018.11.029
Xiaoliang Huang , Xiao Guo , Xiang Zhou , Chen Shen , Xinqian Lu , Zhilin Qi , Qianhua Xiao , Wende Yan

Abstract A high temperature and high pressure (HTHP) gas reservoir with a large accumulation of water-soluble gas contains a large amount of dissolved gas in formation water. The dissolved gas in the formation water will be released due to formation pressure depletion in the production process. At present, few researches have been done on water invasion law of gas wells regarding the released dissolved gas, especially when the change rule of water and gas is not clear in porous media after the release of water-soluble gas, which leads to the unclear water invasion law and the gas reservoirs cannot be developed efficiently. In this paper, a visualization sand filling tube is used to conduct experiments to study the effects of the dissolved gas on the law of the gas-water contact (GWC) changes in the water-soluble gas release process. The experimental results show that the release of dissolved gas leads to a GWC rise at the beginning of the depressurization process. After the pressure drops to a lower level, the GWC will decline due to a large amount of dissolved gas being released from formation water. Subsequently, numerical simulations are performed to study the effects of different solubilities of natural gas, the gas production rate, the aquifer size, and stress sensitivity on the water invasion law of the gas well. The simulation results show that a greater solubility of natural gas, a higher gas production rate, a larger aquifer size, and the existence of stress sensitivity all lead to stronger bottom water coning and an early water break-through. For the non-coning region, a greater solubility of natural gas will lead to a slower rise in the GWC. The simulation results show that the water invasion velocity with water-soluble gas is faster than the velocity without water-soluble gas.

中文翻译:

水侵规律对水溶气大聚集高温高压气藏气井的影响

摘要 水溶性气体聚集的高温高压气藏,地层水中含有大量溶解气体。地层水中溶解的气体在生产过程中会因地层压力枯竭而释放出来。目前,关于气井释放溶解气的水侵规律研究较少,特别是当水溶性气体释放后多孔介质中水气变化规律不明确时,导致气井水侵规律研究不明确。水侵规律,气藏不能有效开发。本文利用可视化充砂管进行实验,研究溶解气体对水溶性气体释放过程中气水接触(GWC)变化规律的影响。实验结果表明,在减压过程开始时,溶解气体的释放导致GWC上升。压力下降到较低水平后,由于地层水中释放出大量溶解气,GWC会下降。随后,通过数值模拟研究了不同天然气溶解度、产气率、含水层大小和应力敏感性对气井水侵规律的影响。模拟结果表明,天然气溶解度越大、产气率越高、含水层尺寸越大、应力敏感性的存在,均导致底水锥进和水提前突破。对于非锥体区域,天然气溶解度越大,GWC 上升越慢。
更新日期:2019-02-01
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