牛东区块充氮气欠平衡钻井技术研究与应用
发布时间：2018-12-20 07:59
【摘要】：欠平衡钻井又被称为负压钻井,是指在钻井时井底压力小于地层压力,地下流体有控制地进入井筒并且循环到地面上的钻井技术。本文研究了充氮气欠平衡钻井技术,从牛东区块的地质特征到欠平衡钻井技术的可实施性进行了综合分析。分别对充氮气钻井气体、液体注入参数、钻井液性能要求、复合钻井技术、完井技术以及设备配套技术进行了阐述。一、牛东区块目的层P1k地层为火成岩,裂缝、孔洞发育,使用常规钻井机械钻速低,极易发生井下漏失,情况复杂,采用充氮气欠平衡钻井有效的解决了这一问题。二、充氮气欠平衡钻井技术能够大幅降低钻井液对储层的伤害,增加储层的产出能力。三、充氮气欠平衡井段使用高效PDC钻头配合直螺杆进行复合钻进,有效的解决了牛东区块火成岩井段机械钻速慢的问题。四、牛东区块开发井中大规模应用充氮气欠平衡技术,如果采用不压井起下钻装置或套管阀等辅助设备完成欠平衡,该部分设备所占充氮气欠平衡钻井总成本比例为30-40%左右,将导致充氮气欠平衡钻井的成本进一步增加,必须降低开发成本,提高综合开发效益。GBC冻胶封隔井筒技术实现了充氮气欠平衡钻井不压井情况下的完井技术,成功的降低了成本。
[Abstract]:Underbalanced drilling, also called negative pressure drilling, refers to the drilling technology in which the bottom hole pressure is less than the formation pressure, and the underground fluid enters the wellbore and circulates to the ground in a controlled way. In this paper, the underbalanced drilling technology with nitrogen filling is studied, and the comprehensive analysis is made from the geological characteristics of Niudong block to the feasibility of underbalanced drilling technology. The drilling gas, liquid injection parameters, drilling fluid performance requirements, compound drilling technology, completion technology and equipment matching technology are described respectively. First, the P1k formation in the target layer of Niudong block is igneous rock, fracture, hole development, low drilling speed using conventional drilling machine, easy to occur underground leakage and complex situation. This problem is effectively solved by nitrogen filling underbalanced drilling. Secondly, nitrogen-filled underbalanced drilling technology can greatly reduce the damage of drilling fluid to reservoir and increase reservoir productivity. Thirdly, the low drilling speed of igneous rock section in Niudong block is effectively solved by using high efficiency PDC bit and straight screw to carry out compound drilling in the underbalanced section of nitrogen filling. Fourth, in the development wells of Niudong block, the technology of filling nitrogen gas underbalance is applied on a large scale. If the auxiliary equipment, such as drilling device or casing valve, is used to complete the underbalance, This part of the equipment accounts for about 30-40% of the total cost of nitrogen-filled underbalanced drilling, which will further increase the cost of nitrogen-filled underbalanced drilling, and the development cost must be reduced. In order to improve the comprehensive development benefit, GBC gel sealing and isolating wellbore technology has realized the completion technology under the condition of filling nitrogen gas underbalanced drilling without well killing, and the cost has been reduced successfully.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE242
本文编号：2387689
[Abstract]:Underbalanced drilling, also called negative pressure drilling, refers to the drilling technology in which the bottom hole pressure is less than the formation pressure, and the underground fluid enters the wellbore and circulates to the ground in a controlled way. In this paper, the underbalanced drilling technology with nitrogen filling is studied, and the comprehensive analysis is made from the geological characteristics of Niudong block to the feasibility of underbalanced drilling technology. The drilling gas, liquid injection parameters, drilling fluid performance requirements, compound drilling technology, completion technology and equipment matching technology are described respectively. First, the P1k formation in the target layer of Niudong block is igneous rock, fracture, hole development, low drilling speed using conventional drilling machine, easy to occur underground leakage and complex situation. This problem is effectively solved by nitrogen filling underbalanced drilling. Secondly, nitrogen-filled underbalanced drilling technology can greatly reduce the damage of drilling fluid to reservoir and increase reservoir productivity. Thirdly, the low drilling speed of igneous rock section in Niudong block is effectively solved by using high efficiency PDC bit and straight screw to carry out compound drilling in the underbalanced section of nitrogen filling. Fourth, in the development wells of Niudong block, the technology of filling nitrogen gas underbalance is applied on a large scale. If the auxiliary equipment, such as drilling device or casing valve, is used to complete the underbalance, This part of the equipment accounts for about 30-40% of the total cost of nitrogen-filled underbalanced drilling, which will further increase the cost of nitrogen-filled underbalanced drilling, and the development cost must be reduced. In order to improve the comprehensive development benefit, GBC gel sealing and isolating wellbore technology has realized the completion technology under the condition of filling nitrogen gas underbalanced drilling without well killing, and the cost has been reduced successfully.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE242
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