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Research on plugging technology in the Yingtai Area of Daqing oilfield
Published in Lin Liu, Automotive, Mechanical and Electrical Engineering, 2017
Lost circulation is a common problem during well drilling, and complex cases caused by and various downhole vicious accidents induced by lost circulation because great harm on the drilling engineering. Lost circulation may delay the drilling operation and lengthen the drilling cycle (Xu Jian-jun, et al. 2013). Mud or plugging materials and great lost circulation may lead to huge material damage during lost circulation. If lost circulation happens in the reservoir stratum, it will damage the reservoir stratum as well as the productivity (Xu Jian-Jun, 2013; Longchao, 2016). Lost circulation also disturbs the geological logging work and the normal maintenance and treatment of mud performance. Due to complex causes and constraints of lost circulation as well as strong pertinence of plugging technology, this problem has so far not been resolved (Yan Limei et al., 2014). Complex cases such as well collapse and lost circulation often happen during drilling construction in the Yingtai Area, Daqing oilfield, causing lots of inconvenience for the drilling construction. In order to solve the lost circulation in the Yingtai Area, a laboratory test analysis was made to evaluate plugging materials, and finally the plugging material suitable for Yingtai Area was found.
Investigating of compositions for lost circulation control
Published in Vladimir Litvinenko, Youth technical sessions proceedings, 2019
M.V. Nutskova, E.Y. Rudiaeva, V.N. Kuchin, A.A. Yakovlev
Drilling fluid lost circulation is considered as one of the most common types of difficulties during well drilling. After defining the lost circulation category, it’s control action will be selected, while the criteria for selection are economical effectiveness, implementation simplicity and work experience in similar geological conditions (Leusheva 2017, Turitsyna 2010, Vasilev 2016).
Experimental study of a novel oil-based crosslinking-curing lost circulation material for shale gas well
Published in Petroleum Science and Technology, 2023
Wei Liu, Qicong Xu, Chong Lin, Zhiping Yuan, Xiabin Xu
Lost circulation has been a major problem during Longmaxi shale gas well drilling by high-density oil-based drilling fluid in the southern Sichuan Basin, China. Massive expensive oil-based drilling fluids (OBF) were lost into the shale formation, directly leading to huge economic losses. If untreated, lost circulation probably causes additional drilling problems, such as poor hole cleaning, pack-offs, stuck pipe, kick, borehole collapse, incomplete primary cement job and well abandonment in severe cases (Lavrov 2016). Also, the leaked drilling fluids by lost circulation may change the petrological properties of the stimulated reservoir domain and adversely influence gas production of shale reservoir (Li et al. 2020; Cui et al. 2020). Long nonproductive time (Rehm et al. 2009) and significant economic costs (Cook et al. 2011) were generated for treating these trouble issues. For example, during horizontal section drilling of Changning H6-1 well, nearly 1,400 m3 of white oil-based drilling fluid (2.05 g/cm3) was lost and 486 h was spent on lost circulation treatment trials. The frequent and severe lost circulation severely delays the exploration and development of Longmaxi shale gas in the southern Sichuan Basin.
Preparation and characterization of polymer retarder for plugging cement slurry
Published in Journal of Dispersion Science and Technology, 2022
Jie Feng, Lihui Zheng, Xiaoying Wu, Jing Wu, Yongjin Yu, Long Li, Ming Li
Lost circulation is a phenomenon in which the drilling fluid, cement slurry, or other working fluids are lost in the formation during drilling. This is a common downhole complication during drilling.[1–3] It not only consumes drilling time and causes the loss of drilling fluid but may also cause a series of complicated situations such as sticking, blowout, and well collapse, and even lead to the abandonment of wells, resulting in significant economic losses.[4] The cement slurry is an essential lost circulation material. Its thickening properties and thickening time are directly related to the success or failure of lost circulation operations, especially in high-temperature deep well-plugging operations, in which an effective controllable retarder is particularly important.[5,6]
Sustainable drilling operations by utilizing waste biomass as a lost circulation additive
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2019
Hari Ganesh, P. Sivasankar, Sivakumar Pandian, Anirbid Sircar
In oil and gas well drilling, lost circulation occurs when drilling fluid flows into the surrounding permeable formations instead of circulating back to the surface through annulus in the circulation system. This will lead to a reduction in the volume of drilling mud in the well, which in turn will result in the reduction of hydrostatic pressure in the well. As a consequence of the decrease in static pressure head of fluid column in the well, the pressure within the well may become lower than the formation pressure, eventually leading to the flow of fluid from the surrounding formation to the wellbore and resulting in well kick or other well control issues (Qiu et al. 2019). Oil industry spends millions of dollars every year to avert lost circulation and its accompanying detrimental outcomes that cause Non-Productive Time (NPT) due to pipe stuck up, blowouts and underground blowout which in turn lead to the abandonment of expensive wells (Iscan and Kok 2007; Luzardo et al. 2015). It is estimated that more than several millions of USD have been spent annually to combat and mitigate lost circulation (Al-Hameedi et al. 2018).