海南福山油田流一段石英砂替代陶粒适应性评价及意义

Adaptability evaluation and significance of replacing ceramsite with quartz sand in the L1 Formation of the Fushan Oilfield in Hainan

页岩气、致密油气等非常规油气资源开发,关键在于提质增效降低成本。文章阐明了海南近海福山油田流一段薄互层致密砂岩采用本地石英砂替代陶粒作为主流支撑剂的低成本和优化裂缝导流能力的适应性特征;提供了海南本地20/40目石英砂和20/40目陶粒室内试验评价结果,在不同应力不同铺置浓度条件下, 20/40目石英砂和20/40目陶粒具有不同的导流能力;进一步揭示了地质参数相近两口开发井,在数值模拟优化试验基础上实施现场试验的结果:裂缝导流能力达到21D·cm,可满足流一段致密砂岩储层的导流需求;在35Mpa应力条件下, 10kg·m-2铺置浓度的20/40目石英砂可获得21D·cm以上的导流能力。现场试验表明,石英砂试验井压裂后前期基本可与陶粒试验井效果相同,随着开采时间延长,使用陶粒井的累计产油量和稳产有效期均超过使用本地石英砂开发井。因此,陶粒支撑剂经济效益更高,陶粒支撑剂值得继续长期和规模化使用。

The key to unconventional oil and gas development,such as shale gas and tight oil and gas,is to improve quality and efficiency and reduce costs.This paper illustrates the adaptability of using local quartz sand instead of ceramsite as the mainstream proppant in the thin interbed tight sandstone of the L1 formation of the Fushan Oilfield,offshore Hainan,to optimize the fracture conductivity at low cost,and the laboratory test evaluation results of Hainan local 20/40 mesh quartz sand and 20/40 mesh ceramsite are provided.Under different stress and paving concentration,20/40 mesh quartz sand and 20/40 mesh ceramsite have different conductivity;this further reveals the results of field tests conducted for two development wells with similar geological parameters on the basis of numerical simulation optimization tests.The fracture conductivity reaches 21 D·cm,which can meet the demand of tight sandstone reservoir in the L1 Formation.Under the stress condition of 35 Mpa,10 kg·m-2 laying concentration of 20/40 mesh quartz sand can obtain more than 21 D·cm conductivity.Field tests show that the quartz sand test well has the same effect as the ceramic test well in the early stage after fracturing.With longer production time,the cumulative oil production and stable production life of ceramsite well exceeded that of local quartz sand development well.Therefore,the economic benefits of ceramic-based proppant are higher and ceramic-based proppants are worth continuing to be used on a long-term and large-scale basis.