超深断溶体油藏油井见水特征及生产制度优化——以塔里木盆地顺北油田Z井为例

doi:10.7657/XJPG20210506

摘要/Abstract

摘要：

为优化超深断溶体油藏油井见水后的生产制度,以塔里木盆地顺北油田Z井为例,利用油藏工程与数值模拟方法,结合动态和静态资料,分析油藏地质特征和油井见水特征,对比见水前后油井产能差异,计算水侵速度和动用储量,并利用数值模拟方法研究水窜特征,优化见水后油井的生产制度。结果表明,Z井流入动态曲线之所以呈上翘型,是因为降低井底流压或增大井底生产压差后流体存在高速流动,且超深断溶体油藏中有新的缝洞体开启,增加了新的流动通道,导致油井采油能力大幅度增加;油井一旦见水,日产油量急剧下降,油井产能损失大;Z井动用储量约为338×10⁴ t,底水侵入时间为2020年1月,水侵速度约为0.61×10⁴ m³/月,到2020年11月3日,Z井水锥位置距离初始油水界面约395 m,距离井底约131 m;推荐Z井合理生产制度为7 mm油嘴。矿场应用后日产油量由96 t增加至170 t,含水率控制在2.00%以内,达到较好效果。

关键词: 塔里木盆地, 顺北油田, 超深断溶体油藏, 油井, 见水特征, 流入动态曲线, 合理生产制度, 深大断裂

Abstract:

In order to optimize the production system after water breakthrough in the oil wells drilled in ultra-deep fault-karst reservoirs and taking Well Z in Shunbei oilfield in Tarim basin as a case, the characteristics of reservoir geology and water breakthrough in the oil wells were analyzed through reservoir engineering method and numerical simulation. The well productivities before and after water breakthrough were compared, the water invasion rate and producing reserves were calculated, the water channeling characteristics was studied based on numerical simulation and the production system after water breakthrough was optimized. The results show that: 1) The inflow performance curve of Well Z is upturned, because the fluid flows at a higher rate after reducing the bottom hole flowing pressure or increasing the bottom hole producing pressure difference, and new fractures and caves open and more flowable channels occur, resulting in a great increase of the oil productivity in the well; 2) After water breakthrough, the daily oil production dropped sharply, and the productivity reduced dramatically; 3) The producing reserves in Well Z are about 338×10⁴ t, bottom water invaded in January 2020 at a rate of about 0.61×10⁴ m³/month, and by November 3, 2020, the water cone in Well Z was about 395 m from the initial oil-water contact and about 131 m from the bottom hole. According to the results, a 7 mm choke was recommended and used in Well Z. After field application, the daily oil production has increased from 96 t to 170 t and the water cut has been controlled less than 2.00%, indicating a satisfactory result.

Key words: Tarim basin, Shunbei oilfield, ultra-deep fault-karst reservoir, oil well, water breakthrough characteristic, inflow performance curve, rational production system, deep and large fault

中图分类号:

TE344

程晓军. 超深断溶体油藏油井见水特征及生产制度优化——以塔里木盆地顺北油田Z井为例[J]. 新疆石油地质, 2021, 42(5): 554-558.

CHENG Xiaojun. Characteristics of Water Breakthrough and Optimization of Production System of Oil Wells Drilled in Ultra-Deep Fault-Karst Reservoirs: A Case Study on Well Z in Shunbei Oilfield, Tarim Basin[J]. Xinjiang Petroleum Geology, 2021, 42(5): 554-558.

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