Experimental Evaluation and Field Application of the FDM-1 Filming Plugging Agent
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摘要: 哈得逊地区石炭系地层以泥岩为主,夹薄层砂岩、角砾岩。钻井过程中剥落掉块严重,造成挂卡,岩屑代表性差,影响地质录井;增斜段和水平段钻井托压严重,定向和钻井效率很低。为此,钻井液引入了成膜封堵技术,对FDM-1新型成膜封堵剂进行了室内评价实验,建立了溶液漏失量和滤膜透失量评价成膜效率的方法,并对其在土浆中的作用机理进行研究。实验评价和现场应用结果表明,FDM-1是一种纳米-微米级高分子聚合物乳液,可在多孔介质表面通过滤失形成致密的高分子膜,这种高分子膜具有非渗透、可变形的特征,在地层孔隙中形成致密的封堵层,降低滤失量,有效地稳定井壁,解决泥页岩掉块问题。同时,通过改善泥饼质量起到润滑减阻,有效地解决定向托压的问题。Abstract: The lithology of the carboniferous system in the Hudson area is mainly mudstone interbedded with thin sandstones and breccia. Serious sloughing of borehole wall during drilling operation has caused overpull and pipe-sticking. Drilled cuttings sampled by mudlogger have poor representativity, reducing the quality of lithological recognition. In drilling the build-up section and horizontal section of a well, well sloughing has caused inability to exert weight on bit, making well angle buildup and drilling low efficient. Plugging of pore throats through filming of drilling fluid on the surface of borehole wall was introduced to address these problems. In laboratory experiment, a filming agent FDM-1 was evaluated for its filming efficiency using a test method in which volume of solution lost and the volume of filtrate through the filter membrane formed by the dissolved filming agent were used as the evaluation parameters. The functioning mechanisms of FDM-1 in clay slurries were studied. Laboratory evaluation and the practices of field application showed that, as a nanometer-micrometer-sized high polymer emulsion, FDM-1 was able to form a dense polymeric membrane on the surface of porous media after filtration of the liquid in the polymer solution into the media. This polymeric membrane is non-permeable and deformable, and is able to form dense plugging layers inside the formation pores, thus effectively reducing filtration rate of drilling fluid and stabilizing borehole wall. Borehole wall sloughing problem was resolved successfully using FDM-1, and by improving the quality of the mud cakes, good lubrication was achieved, which was beneficial to resolving the problem of inability to exert weight on bit.
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Key words:
- Drilling fluid /
- Anti-sloughing agent /
- Plugging agent /
- Filming /
- Unable to exert WOB /
- Borehole wall stabilization
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