绳索取心振动防堵钻具的试验研究

The development of wireline coring barrel vibration anti-blocking drilling tools

摘要:

常规绳索取心钻具在钻进破碎地层时易发生岩心堵塞，回次长度缩短，钻进效率降低，深孔时则尤为明显。现阶段绳索取心液动锤技术具有优秀的岩心防堵功能，但因其结构复杂、技术要求高、价格偏贵等原因普及度不高，缺乏具有良好岩心防堵功能的绳索取心钻具。研制了HQFD型绳索取心振动防堵钻具，其中防堵内管总成是研究核心，保持与常规H规格内管总成长度与直径不变进行定尺寸研发，利于实现内管总成间的高效替换。该钻具高效振动的泵量需求与H规格规范推荐泵量吻合度高，附加泵压低，能以最小投入实现岩心防堵功能。初步完成了HQFD型振动防堵钻具的振动原理选择、功能机构布局、振动效果测评等工作，为绳索取心岩心防堵提供了新的选择。

Abstract:

When drilling in fractured formations， conventional wireline coring tools are prone to core jamming， shortened round length， and reduced drilling efficiency， which is particularly obvious in deep holes. At present， the wireline coring hydraulic hammer technology has an excellent core anti-jamming function. However， due to its complex structure， high technical requirements， and high price， its popularity is not high. In practice， there is a lack of wireline coring tools with good core anti-jamming functions. The project has developed a new HQFD type wireline coring vibration anti-jamming coring tool. Among them， the anti-jamming inner tube assembly is the core of the research. The fixed-size development is carried out while keeping the length and diameter of the conventional HQ inner tube assembly unchanged， which is conducive to the efficient replacement between the inner tube assemblies. The pump volume requirement for the efficient vibration of this tool is highly consistent with the recommended pump volume in the HQ specifications and standards， and the additional pump pressure is low， which can achieve the core anti-jamming function at the minimum cost. The first generation of the HQFD type vibration anti-jamming coring tool has completed the research and development work such as the selection of the vibration principle， the layout of the functional mechanism， and the evaluation of the vibration effect. The new coring tool provides a new option for the core anti-jamming of wireline coring.