松科2井抗高温随钻堵漏材料优选及封堵效果评价

发布时间：2018-05-24 08:41

本文选题：松科2井 + 堵漏材料　；参考：《成都理工大学》2017年硕士论文

【摘要】：松科2井位于松辽盆地徐家围子断陷带,设计井深6400m,将是世界第一口钻穿白垩纪陆相地层的大陆科学钻探井,为研究距今6500万年至1.4亿年间的气候和环境变化奠定科学基础。钻井过程中,井越深,施工难度越大,出现问题时,处理起来也更加困难。钻井一旦发生漏失,不但会造成钻井液的巨大损失,还会对正常钻井构成威胁,因此,为确保钻井安全,有必要时刻注意钻井防漏堵漏。根据地温梯度推算,松科2井井下温度可达200℃,常用的随钻堵漏材料能够满足此高温环境需求的较少,且目前抗高温随钻堵漏材料主要集中在新材料的研发方面,对常用材料的抗高温性能评价较少。本文依托松科2井工程,为满足高温钻井防漏堵漏的需要筛选合适的随钻堵漏材料。结合松辽盆地地层特征,对多层段地层岩性进行了分析和研究,并评价了地层的裂隙及孔隙发育特征,分析了漏失影响因素,为钻井防漏堵漏提供了参考。在堵漏材料中筛选出常用的20种,通过室内热滚实验,分别评价了材料的抗高温性能,并筛选出9种可用于200℃以上高温井的堵漏材料。同时结合松科2井随钻堵漏的技术要求,进一步筛选出6种堵漏材料,并与松科2井抗高温钻井液体系进行了配伍性测试。最后通过室内堵漏实验,测试了所筛选的堵漏材料的单剂堵漏效果和复合堵漏效果,为松科2井随钻堵漏提供了参考。本文主要研究内容和研究成果如下:(1)根据松辽盆地地层层序特征并结合现有钻井资料,对松科2井目的层岩性特征及裂隙发育特征进行分析,并研究了各种因素对松科2井钻井漏失的影响,为钻井随钻防漏堵漏提供参考。(2)在常用的堵漏材料中选取核桃壳、云母片等20种材料,通过室内热滚实验,对材料的抗温性能进行了评价,并从中优选出9种可抗200℃高温的堵漏材料。(3)对钻井的随钻堵漏机理进行分析,并根据松科2井随钻堵漏的技术要求,进一步优选出6种经济可靠的随钻堵漏材料,并将这6种材料与松科2井现场使用的抗高温钻井液体系进行配伍性测试。结果表明:颗粒状堵漏材料如碳酸钙颗粒在加量5%及以下时对钻井液流变性、滤失性基本没有影响,纤维状材料和片状材料加量较多时会对钻井液流变性能产生一定影响,而这两类材料对钻井液滤失性影响不大。(4)采用DL-2堵漏实验装置,对颗粒状、纤维状和片状材料等三类材料单剂在不同加量下的封堵性能进行了评价,并测试了三类材料复合后的封堵效果。结果表明:颗粒性堵漏材料对模拟漏层有一定的封堵效果,其最优加量为5%左右。纤维状堵漏材料作为单剂使用时对模拟漏层基本没有封堵效果,需与其他材料复合使用。片状堵漏材料作为单剂使用时,封堵效果也不佳,且基本没有承压能力,也需要与其他材料复合使用。三类材料复合使用时,其堵漏效果明显增强,并最终优选出适用于松科2井的随钻堵漏剂配方:5%颗粒性材料+2%片状材料+2%纤维状材料,其中,颗粒性材料可选用碳酸钙颗粒、焦炭粒和硅藻土颗粒,片状材料可选用云母片,纤维状材料可选用石棉纤维和玻璃纤维。
[Abstract]:The 2 well in Songliao basin is located in Xujiaweizi fault zone of Songliao basin. The design of well depth 6400m will be the first continental scientific drilling well drilling through Cretaceous continental strata in the world. It lays a scientific foundation for the study of climate and environment changes between 65 million and 140 million years ago. It is also more difficult. Once the drilling is lost, it will not only cause the huge loss of drilling fluid, but also threaten the normal drilling. Therefore, in order to ensure the safety of the drilling, it is necessary to pay attention to the leakage prevention and leakage at all times. According to the geothermal gradient, the underground temperature of well 2 well in the well is up to 200 degrees C, and the commonly used drilled plugging material can meet the high temperature environment. The demand is less, and the current high temperature drilling plugging materials are mainly concentrated in the research and development of new materials, and the evaluation of the high temperature resistance of common materials is less. This paper relies on the songke 2 well project to screen the suitable drilling plugging material for the need of leakage prevention and leakage in high temperature drilling. The analysis and research are carried out, and the characteristics of formation fracture and pore development are evaluated, and the influence factors of leakage are analyzed, which provides a reference for leakage prevention and leakage in drilling. 20 commonly used kinds of materials are screened out in the leak stoppage. Through indoor thermal rolling experiment, the high temperature resistance of the material is evaluated, and 9 kinds of plugging in high temperature well above 200 degrees C are screened. At the same time, combined with the technical requirements of drilling plugging in the 2 well of Pinus, 6 kinds of leaky materials were screened, and the compatibility test was carried out with the anti high temperature drilling fluid system of well 2. Finally, the leak blocking effect and the compound plugging effect of the filtered material were tested through the indoor leakage test. The main research contents and research results of this paper are as follows: (1) according to the characteristics of the stratigraphic sequence and the existing drilling data in Songliao Basin, the characteristics of lithology and fracture development of the target layer of well 2 in songke well are analyzed, and the influence of various factors on drilling leakage of well 2 in songke 2 is studied, which provides a reference for drilling and leakage prevention and leakage prevention. (2) 20 kinds of materials such as walnut shell and mica piece were selected in the material. Through indoor thermal rolling experiment, the temperature resistance of the material was evaluated, and 9 kinds of plugging materials which could resist 200 degrees of high temperature were selected. (3) the mechanism of drilling plugging was analyzed, and 6 kinds were further optimized according to the technical requirements of the drilling stoppage. The 6 materials are compatible with the high temperature drilling fluid system used on the site of well 2 in Pinako. The results show that the granular material, such as Calcium Carbonate Granules, has no effect on the rheology of the drilling fluid when the amount of Calcium Carbonate Granules is added up to 5% or below. The rheological properties of drilling fluid will have a certain effect on the drilling fluid, and the two kinds of materials have little effect on the filtration property of drilling fluid. (4) the sealing performance of three kinds of single agents, such as granular, fibrous and flaky materials, was evaluated by DL-2 plugging experiment device, and the blocking effect of three kinds of materials was tested. The results showed: Granular plugging material has a certain blocking effect on the simulated leakage layer, and the optimum addition amount is about 5%. Fiber like leakage material has no blocking effect on simulated leakage when used as a single agent. It needs to be used with other materials. The sealing effect is not good when used as a single agent. In combination with other materials, the plugging effect of the three types of materials is obviously enhanced, and the formula for plugging plugging is optimized for the 2 well of Pinako: 5% granular material +2% sheet material +2% fiber material, in which the granular materials can be selected as Calcium Carbonate Granules, coke and diatomite particles, and the sheet material can be used in the cloud. The parent material and fibrous material can be made of asbestos fiber and glass fiber.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P634.8

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