Research and Application of the Position-Occupying Drilling String Techniques for Twin Holes in Monobores in Bohai Oilfield
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摘要: 传统的单筒双井技术一般为两口井共用一个一开井眼,受工具、工艺和技术的限制,一开井段中完井深较浅(约300.00~400.00 m),且存在一开井段双井轨迹无法分离、扩眼易出现新井眼、水泥用量大等问题,严重限制了一开井段单筒双井作业的顺利实施。为解决该问题,结合渤海A油田的具体情况,引进了占位钻具技术,并通过改造悬挂基座等配套工具、细化工艺及优化设计,成功实现了海4井、海22井两口井的井眼轨迹独立预斜、一开φ339.7 mm套管分别加深至1000.00 m和600.00 m,同井深情况下水泥用量相对减少50%以上,既达到封固浅层气地层、降低井眼轨迹碰撞风险及减小水泥用量的目的,又为后续二开、三开等井段留足了安全余量。最终海4井和海22井的完钻井深分别达到4428.00 m和3173.00 m,实现了安全、高效作业,有效缩短了工期,取得了较大的经济效益。Abstract: In twin hole drilling, traditional technology only allows achieving an initial depth about 300.00-400.00 meters in twinhole due to limitations imposed by tools, processes and technologies. At the same time, there are some drawbacks, such as having two wells in one hole, making another hole when reaming and providing a large amount of cement. All these conditions may make it impossible to meet demands of some wells. To solve these problems, and with consideration to specific conditions of the A Oilfield in the Bohai Area, position-occupying drilling techniques had been introduced. With the combination of reconstruction, fine tuning and design optimization of hanger base and other auxiliary facilities, borehole trajectories in Well Hai 4 and Well Hai 22 were controlled independently. The depth of the φ339.7 mm casing in the first spud-in was deepened to 1, 000.00 m and 600.00 m. The volume of cement consumed was reduced by more than 50% when compared with wells of similar depths. Deployment of these techniques can effectively seal off shallow gas formations, minimize risks related to collision of boreholes and reduce the volume of cement consumption. In addition, these techniques might generate necessary safety redundancy for the second, third and other well intervals. TVD of the Well Hai 4 and the Well Hai 22 are 4428.00 m and 3173.00 m, respectively. In addition to achieve safe and high-efficiency implementation of relevant operations, these techniques can effectively reduce the time required and significantly enhance economic benefits of relevant operations.
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