Development of a Reamer-while-Drilling with Multistage Variable Diameter and Analysis of Force on Blade and Weight-on-Bit Distribution
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摘要:
深层小井眼采用随钻扩眼器进行扩眼作业时存在井眼缩径、固井质量差和卡钻频繁等问题。为解决该问题，基于随钻扩眼器基本结构和工作原理，采用新型变径结构，研制了一种多级变径随钻扩眼器；建立了随钻扩眼尺寸与主动活塞轴向位移之间的函数关系，并分析了扩眼器刀翼的受力情况；采用双因素计算方法分析了该扩眼器的钻压分配情况，得到了随钻扩眼器钻压分配比对扩眼尺寸、钻具锐度及地层抗压强度的影响规律。分析得知，随钻扩眼器的钻压分配比与钻遇地层抗压强度、扩眼尺寸呈正比，与扩眼器锐度呈反比，该扩眼器的理论井径扩大率为7%～20%。研究认为：对随钻扩眼器进行钻压分配分析，可以指导扩眼器的设计及领眼钻头的选型；研制的多级变径随钻扩眼器为提高扩眼效率提供了技术支撑。
Abstract:Reaming operations in deep slim holes with a reamer-while-drilling faced various problems, such as borehole shrinkage, poor cementing quality and frequent sticking etc. A reamer-while-drilling with multistage variable diameter was developed by adopting a new variable diameter structure following the basic structure and working principle of reamer-while-drilling. The functional relationship between the reaming-while-drilling size and the axial displacement of the active piston was built, and the forces on the blade of the reamer were investigated. The weight-on-bit distribution on the reamer was analyzed by the two-factor calculation method, and the influence laws of the weight-on-bit ratio of the reamer-while-drilling on reaming size, drilling tool sharpness, and the compressive strength of the formation were obtained. The analysis showed that the weight-on-bit ratio of the reamer-while-drilling was directly proportional to the compressive strength of the penetrated formation and reaming size, and inversely proportional to reamer sharpness. The theoretical borehole diameter enlargement rate of the reamer was 7%–20%. The paper concludes that weight-on-bit distribution analysis of reamers while drilling can guide the design of such reamers and the selection of pilot bits, and the developed reamer-while-drilling with multistage variable diameter can provide effective technical support for improving reaming efficiency.
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图 1 多级变径随钻扩眼器的结构
Figure 1. Structure of reamer-while-drilling with multistage variable diameter
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图 2 多级变径随钻扩眼器的工作原理
Figure 2. Working principle of reamer-while-drilling with multistage variable diameter
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图 6 扩眼直径与主动活塞轴向位移的关系
Figure 6. Relationship between reaming diameter and axial displacement of active piston
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图 7 多级变径随钻扩眼器钻压比与扩眼器和领眼钻头钻遇地层抗压强度之比的关系
Figure 7. Relationship between weight-on-bit ratio of reamer with multistage variable diameter and ratio of compressive strength of formation penetrated by reamer to that of formation penetrated by pilot bit
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