Expandable tubular open hole clad technology,which adopts physical methods to quickly and effi-ciently seal complex formations such as severe leakage,and realize the well bore structure expansion,is of great significance for safe and efficient drilling of deep and complex wells.Herein,the application field,process prin-ciple and key technologies of expandable tubular open hole clad technology were analyzed and the indoor experi-ments on 299 mm(outside diameter)expandable tubular was conducted.The experimental results indicated that the expansion pressures were 10～12 MPa and 8～10 MPa for the tubular and the thread expansion,respectively.The sealing pressure after thread expansion was higher than 30 MPa when expansion cone with 286 mm diameter was adopted for the 299 mm×14 mm expansion tube.In addition,299 mm(outside diameter)expandable tube was used to seal the severe leakage formation with a length of 666.12 m,aiming to solve the leakage problems of Jialingjiang Formation in the 311.2 mm well bore in Well A in Southwest Oil and Gas Field.The expansion pressure was 8～12 MPa in the field application,which was consistent with the laboratory experimental data.After the installation of the expandable tubular,the density of the drilling fluid for the third drilling stage was increased from 1.17 g/cm3 to 1.85 g/cm3,which ensured the safe drilling of the subsequent formation and realized the drill-ing of the target formation with 215.9 mm bit according to the original design at the same time.The field applica-tion showed that the open-hole plugging technology of expandable tube was an efficient petroleum engineering technology to solve complex problems.It is suggested to consider the expansion scheme in advance in the drilling experience design of complex wells,deep wells and ultra deep wells to deal with risky formations,optimize and expand the well bore structure,which can effectively reduce the complex treating time.

准确预测页岩气水平井井筒流动型态对井筒积液预测及排水采气工艺优选至关重要.分析了黄202 H页岩气井套管生产和油管生产阶段的压裂液返排特征;结合气井压力数据,优选出了适合该井的井筒压力计算模型,预测了不同产气量时不同深度的气液表观流速特征;利用垂流型图版研究了该井套管生产阶段和油管生产阶段时垂直段、倾斜段和水平段的流型变化规律.结果表明:在6种压力计算模型中,Mukherjee-Brill压力计算模型计算的压力误差最小,平均绝对误差为2.39％;黄202 H页岩气井油管生产阶段,气井在倾斜段首先出现积液,排水采气工艺重点应在倾斜段解决气井积液问题;套管生产改为油管生产后,增大了井筒中气相流速,有利于积液排出.

针对塔里木油田9-5/8"套管破损,地层水进入井筒,导致后续采油中100％ 含水而关井.采用194×11 mm膨胀管对破损套管进行封堵.经修复后恢复生产,日产液10 t,出水降至5.1％.本文针对采用新型高钢级膨胀管材进行了有限元分析与室内模拟实验,获得膨胀压力为22～26 MPa,膨胀后内径为196 mm,抗挤毁压力达到25.6 MPa,同时,有限元膨胀压力与室内膨胀压力相吻合,满足现场要求.通过该技术应用,证明了膨胀管技术可以有效修复套管破损问题,有效控制出水,且工具服役性能较常规材料有大幅提升.

Serious bit bouncing and stick slip problems in drilling hard formation with PDC bit often results in low ROP and bit footage,which decreases ROP and drilling footage.The torque balancer tool can store and release torque energy by spring and helical pair,realize drilling with PDC bit smoothly.The field test results show that tool has a rational design structure,reliable working performance and easy operation,which can effectively decrease drilling torque fluctuation,increase drilling footage and ROP per bit in both vertical and directional drilling with PDC bit.

通过对已实施排水工艺措施井的生产动态分析,结合龙岗打孔气举的成功案例,建议采取分阶段逐步攻克难题的策略,提出先行解决悬挂封隔器之上的井筒矛盾,悬挂封隔器之下依靠气井自身能量将积液带至油套连通点,减缓井筒矛盾的技术思路,论证了在悬挂封隔器之上的油套环空实施排水采气的适应性,并推荐优先选择有一定剩余储量、地层能量相对充足、水平段相对较短、油套连通点至水平段最低点的垂深相对较小的气井,开展泡排及气举工艺现场应用试验.

气井合理生产产量是保证气井在较低的投入下获得较长的稳产时间,是提高气藏采出程度,获得较好的经济效益的重要指标。同时,它是编制气田开发方案和制定生产任务的重要依据和高效合理开发气田的基础。通过相关文献的调研,介绍和分析了气井合理生产产量确定的6种方法,为气田开发方案的编制和气井的配产提供一定的借鉴。

Ground throttle and decompression,and heating of water jacket furnace are normally used to carry on the production of sour-gas wells in eastern Sichuan Basin.Well commissioning is often delayed due to ground construction.Ground gathering and transferring pipelines are often plugged by hydrate in winter.A technology of downhole throttle is presented in this study and has been applied to 14 wells.Their wellhead pressure dropped,and the formation of hydrate was prevented.Thereby,the ground technology is simplified,the investment on station construction is saved,and the economic benefits are remarkable.

随着顶驱装置在全球的广泛应用，顶驱下套管装置以其作业的高成功率和高效率等优点，已经成为国内外石油公司争相研发的热点。介绍了国内外顶驱下套管装置的产品型号、结构原理、技术参数以及性能特点等技术现状，指出顶驱下套管装置的主要发展趋势为：机械驱动、微痕夹持、工具集成化及智能化方向发展。

On the basis of geometry, a hypocycloid method was proposed to identify and control drillstring whirling. Treating the whirling as a regular pattern, this method was used to describe motion characteristics of a fixed point on drillstring circumference, to solve equations representing bottom hole assembly (BHA) motion trajectories, to define velocities of each point on the trajectory, and to analyze the impacts of rotation and revolution speeds on BHA whirling. The results show that whirling might cause drillstring rolling around borehole wall with a revolution speed much higher than rotating, inducing downhole tools premature failures. The regular motion patterns of a fixed point on BHA circumference can be expressed by geometry measures, and the trajectory equation indicates that the linear velocity plays an important role in tool wear. The whirling equations representing BHA motion can be worked out from inversions of field and laboratory tests and the results properly match documented tests.