基于有效渗透率的单井增产潜力定量评价——以新疆H储气库为例

doi:10.7657/XJPG20200410

摘要/Abstract

摘要：

地下储气库为天然气季节调峰和应急安全供气提供重要保障,具有单井注采能力大、快速响应强注强采、大排量吞吐等特点。新疆H储气库是中国最大的地下储气库,在第1—第4周期注采运行过程中,存在同一构造区域内单井产能差异大、优化注采界限增产幅度有限的问题,因此开展了基于有效渗透率的单井增产潜力定量评价方法研究。利用动态和静态生产资料对单一产能主控影响因素进行分析,同时以稳定点二项式产能方程为基础,建立了一种基于修正有效渗透率的单井增产潜力定量评价模型,并绘制了模型图版,实现了对单井增产潜力的定量描述。截至第6周期采气末期,根据模型图版优选的5口措施井已完成酸化作业,总计增加产能191.0×10⁴ m³/d,模型预测产能符合率达93.8%,储气库整体调峰能力提升至1 691.0×10⁴ m³/d。

关键词: 地下储气库, 有效渗透率, 产能评价, 增产潜力分析, 增产定量评价, 现场酸化措施

Abstract:

Underground gas storage（UGS）plays an important role in seasonal peaking and supplying gas in emergency, and has the characteristics of large single well injection capacity, fast response and large volume huff-puff. H gas storage in Xinjiang, the largest underground gas storage in China encounters some problems such as large well productivity difference and limited yield-increasing in a same structural area during the initial four injection-production cycles. Therefore, a quantitative evaluation method of well yield-increasing potential based on effective permeability is proposed. Dynamic and static production data are used to analyze the factors influencing well productivity. Meanwhile, a quantitative evaluation model based on the modified effective permeability is developed on the basis of the binomial productivity equation of stable points, and charts are mapped for the model. By the end of the sixth cycle of gas production, the acidizing treatment has been finished in 5 wells selected according to the model charts, the cumulative incremental productivity is 191.0×10⁴ m³/d, the model prediction coincidence rate is 93.8% and the overall peaking capacity of the gas storage has been improved to 1 691.0×10⁴ m³/d.

Key words: underground gas storage, effective permeability, productivity evaluation, yield-increasing potential analysis, quantitative evaluation, acidizing treatment

中图分类号:

TE319

王泉, 陈超, 李道清, 仇鹏, 廖伟, 张士杰. 基于有效渗透率的单井增产潜力定量评价——以新疆H储气库为例[J]. 新疆石油地质, 2020, 41(4): 450-456.

WANG Quan, CHEN Chao, LI Daoqing, QIU Peng, LIAO Wei, ZHANG Shijie. Quantitative Evaluation of Well Yield-Increasing Potential Based on Effective Permeability: A Case of H Gas Storage in Xinjiang[J]. Xinjiang Petroleum Geology, 2020, 41(4): 450-456.

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井的类别	井数/口	注采能力（/10⁴ m³·d-1）		井控半径/m		分布特征
井的类别	井数/口	采气井	注气井	采气井	注气井	分布特征
高产井	14	>70	>55	>390	>400	构造高部位、污染轻
中产井	9	30~70	30~55	220~390	230~400	构造高部位、污染较重
低产井	7	<30	<30	<220	<230	构造低部位、污染严重

井的类别	井名	实际生产压差/MPa	增产措施前单井产能/ （10⁴ m³·d-1）	预测单井产能增加幅度/ （10⁴ m³·d-1）	增产措施后单井产能/（10⁴ m³·d-1）	实际单井产能增加幅度/（10⁴ m³·d-1）	模型符合率/%	增产措施实施批次
中产井	H7井	3..6	45.0	32.9~52.8	98.0	53.0	100.0	第一批
	H10井	3..7	37.0	40.6~60.9	65.0	28.0	69.0	第一批
	H18井	3..7	66.0	14.9~36.1	95.0	29.0	100.0	第一批
	H23井	3..5	42.0	40.5~62.2	98.0	56.0	100.0	第一批
	H15井	3..6	47.0	34.6~53.4				第二批
	H17井	3..8	27.0	56.7~75.8				第二批
	H27井	3..5	69.0	12.1~30.6				第二批
	H28井	3..7	62.0	13.1~30.0				第二批
	H29井	4.0	39.3	37.0~54.2				第二批
低产井	H1井	4.4	37.6	21.6~34.1	59.0	21.4	100.0	第一批
	H13井	4.5	0	22.5~33.5				第二批

增产措施	反应类型	波及范围	水窜风险	储气库适用性	措施推荐度
酸化工艺	以化学反应为主	解除近井地带污染	不易沟通水流动通道	满足储气库近井地带使用	推荐
压裂工艺	以物理造缝为主	人工造缝形成近井渗流通道	易沟通水层引起水窜	储气库高渗地层易出砂	不推荐
酸化压裂	化学反应和物理造缝相结合	溶蚀裂缝和人工造缝,对储集层改造较充分	更易沟通水层引起水窜	储气库注采井井身结构不满足酸化压裂措施	不推荐