Analysis of the Causes and Countermeasures for Wellbore Instability in Cenozoic Erathem in Jiyang Depression
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摘要: 为了有效解决济阳坳陷新生界地层井壁失稳问题,从盆地构造带分布、古沉积环境、岩性特征、流体性质等方面入手,对多年来大量实钻井失稳的井段进行地质归类分析,找出了井壁失稳的地质条件和地质因素。从系统工程理论出发,根据井壁失稳情况,研究得到了5种解决井壁失稳的钻井液技术。同时,结合目前高温高压钻井液现状,针对新生界地层特有的高地温梯度情况,对如何解决深部硬脆性泥岩垮塌问题进行了探讨,提出了解决钙质硬脆性泥岩地层井壁失稳、钻井液高温耗土、有效封堵、钻井流体性能合理控制等技术思路。实践表明,5条应对井壁失稳的技术对策,对于解决与济阳坳陷新生界地层类似地层的井壁失稳问题具有重要的指导意义。Abstract: To solve the problem of borehole instability in Cenozoic Erathem in Jiyang Depression effectively,this paper has classified and analyzed the cases of borehole instability from the aspects of structural belts distribution,paleosedimentary environment,lithology features,fluid properties and so on,and figured out the geological conditions and factors that caused borehole instability.According to the system engineering theory,five kinds of drilling fluid techniques to eliminate borehole instability have been found out,based on various borehole instability situations.At the same time,in view of present situation of drilling fluids used in high temperature and high pressure formation,the sloughing control for hard brittle shale in deep wellbore under the condition of high geothermal gradient in Cenozoic formation has been discussed.A series of ideas have been proposed such as,solving the borehole instability of calcareous hard and brittle shale,high bentonite consumption at high-temperature,effective sealing,and rational control of drilling fluid properties.Practical application has shown that the technical contermeasures mentioned above are of great significance for solving the borehole instability in Cenozoic Erathem in Jiyang Depression.
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Keywords:
- Cenozoic Erathem /
- borehole stabilization /
- drilling fluid /
- Jiyang Depression
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