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首页> 外文会议>Society of Plastics Engineers Annual Technical Conference and Exhibition >The Chiswick Field: Long Horizontal Wells and Innovative Fracturing Solutions in a Low Permeability, Sandstone, Gas Reservoir in the North Sea
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The Chiswick Field: Long Horizontal Wells and Innovative Fracturing Solutions in a Low Permeability, Sandstone, Gas Reservoir in the North Sea

机译：Chiswick田易田：北海渗透，砂岩，北海煤气藏的长水平井和创新裂缝解决方案

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In order to obtain commercial flow rates from the Chiswick field, a low permeability gas reservoir in the UK Southern Gas Basin, it was apparent that field development needed horizontal wells with multiple, propped hydraulic fractures. While this completion strategy is commonplace in US onshore tight gas and a few North Sea chalk reservoirs, only a handful of such completions were attempted historically in the sandstone reservoirs of the North Sea. Ongoing success in chalk and in deep sandstone reservoirs onshore Germany raised expectations that, using modern practises and materials, the strategy could be successfully executed in the high cost environment of offshore UKCS. Chiswick lies in 42m of water at the UK-Netherlands median line. Gas is located in alluvial channel sand systems of Carboniferous age. The reservoir is at 3300m TVDSS with average porosity of 10% and permeability 1 mD; initial pressure and temperature are 392 bara, 115°C respectively. Results from four appraisal wells, drilled 1984 - 1999, determined that commercial rates would only be possible if development wells were horizontal and hydraulically fractured. The initial field development plan entailed two horizontal wells with 2km reservoir sections, stimulated with several massive propped fractures. The complex reservoir is highly stratified with intermixed channel sands, coal and shale. Besides reservoir uncertainties, there were operational challenges to be overcome. A major hurdle was a constrained regional market for high-specification stimulation vessels for the Chiswick development programme. A solution was found by converting a large supply-vessel into a stimulation vessel with the installation of a large capacity, land-based frac-spread. It successfully delivered fourteen frac-jobs in three wells (two are described in this paper). Target post-stimulation flow-rates were achieved in all cases. The paper discusses how a fundamental rethink of what was technically possible allowed a complex tight gas field in the North Sea, previously thought non-commercial, to be brought successfully onto production.
机译：为了获得来自Chiswick领域的商业流量，英国南方天然气盆地的低渗透性气体储层，显然是现场开发所需的水平井，具有多个型液压裂缝。虽然这一完成策略在美国陆上靠气体和几个北海粉笔库中普遍存在，但历史上只在北海的砂岩水库历史上尝试了一些这样的完成。在粉笔和深砂岩水库持续成功的持续成功德国提高了期望，使用现代实践和材料，该战略可以成功地在海上UKCS的高成本环境中执行。 Chiswick位于英国 - 荷兰中位数的4200万水。天然气位于加油通道砂系统中的石炭产。水库是3300米的TVDSS，平均孔隙率为10％，渗透率1 MD;初始压力和温度分别为392巴拉，115°C。 1984年至1999年钻取的四个评估井的结果确定，如果开发井是水平和水力裂缝，只有可能的商业税率。初始现场开发计划需要两个水平井，具有2km储存器部分，刺激了几种大规模的支撑骨折。复杂的储存器高度分层，具有混合的通道砂，煤和页岩。除了水库不确定性外，还有克服业务挑战。主要障碍是Chiswick发展计划的高规格刺激船舶的受限制区域市场。通过在安装大容量，陆基FRAC展开的情况下将大型供应血管转化为刺激容器来发现解决方案。它成功地在三个井中交付了十四个Frac作业（本文描述了两台）。在所有情况下，达到刺激后流动率的目标。本文讨论了在技术上，允许在北海的复杂的紧密气田，以前认为非商业化的基本重新思考如何成功生产。

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