海上高温水驱油田防垢技术研究与应用

针对渤海M稠油油田热水驱过程中高效换热器内部易结垢问题,通过垢化学分析系统模拟了现场注入水水质,筛选出适用于M油田的高温缓蚀防垢剂体系,评价了其性能。结果表明,该体系优选质量浓度为200 mg/L,在130℃的现场注入水质下,试验时间12 h,动态防垢率为94.32%,同时在130℃下对实验挂片动态腐蚀速率为0.0173 mm/a。现场应用结果表明:高温缓蚀防垢剂在M油田具有明显的防垢效果。

非氧化解聚技术在渤海X油田的应用

受长期注聚影响,渤海油田油水井老化聚合物堵塞较为普遍,严重影响油田正常生产。利用实验筛选评价方法,优选一种非氧化解聚体系,并成功应用于现场。应用后,该井视吸水指数增加2.99倍,说明该药剂体系有效解除了聚合物老化复合垢,可进行后续推广。

基于关键层运动的邻近层卸压瓦斯抽采优化设计方法

瓦斯抽采巷(孔)的合理布置是实现邻近层卸压瓦斯精准抽采的基本前提。在深入分析覆岩关键层运动对邻近层瓦斯卸压运移控制机制的基础上,提出了基于关键层运动的邻近层卸压瓦斯抽采优化设计新方法。研究结果表明:邻近层卸压瓦斯抽采巷(孔)的合理布置层位为垮落带边界至导气裂隙带最大发育高度之间的空间范围,导气裂隙带最大发育高度可按基于关键层位置的导水裂隙带高度预计方法来确定;邻近层卸压瓦斯抽采巷(孔)的合理层面位置为导气裂隙带内的“O”形圈裂隙区中部,“O”形圈裂隙区宽度可按其与煤层采高、覆岩关键层结构及采深的函数关系式进行预计。该方法在阳泉矿区邻近层卸压瓦斯实践中得到了应用和验证,邻近层卸压瓦斯抽采率稳定在92%,能较好地指导煤层群开采条件下煤与瓦斯共采实践。

CFD simulations for longwall gas drainage design optimisation

Computational fluid dynamics(CFD) simulation is an effective approach to develop and optimise gas drainage design for underground longwall coal mining. As part of the project supported by the Australian Government Coal Mining Abatement Technology Support Package(CMATSP), threedimensional CFD simulations were conducted to test and optimise a conceptual design which proposes using horizontal boreholes to replace vertical boreholes at an underground coal mine in Australia.Drainage performance between a vertical borehole and a horizontal borehole was first carried out to compare their capacity and effectiveness. Then a series of cases with different horizontal borehole designs were simulated to optimise borehole configuration parameters such as location, diameter, and number of boreholes. The study shows that the horizontal borehole is able to create low pressure sinks that protect the workings from goaf gas ingresses by changing goaf gas flow directions, and that it has the advantage to continuously maintain such low pressure sinks near the tailgate as the longwall advances. An example of optimising horizontal borehole locations in the longwall lateral direction is also given in this paper.

电潜泵复合解堵技术在渤海油田的应用

目前渤海油田许多稠油井电潜泵在运转一段时间后发生堵塞。研究发现,电潜泵堵塞主要是吸入口堵塞,其堵塞物主要为聚合物胶团、重烃垢、其它无机垢等组成的混合垢。由于常规酸化对电潜泵和电缆损害较大,不适用于电潜泵解堵,因此针对电潜泵堵塞物特征,优选出一种低伤害高效电潜泵复合解堵技术,并成功应用于渤海油田,取得良好的解堵效果。