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首页> 外文期刊>Journal of Petroleum Exploration and Production Technology >Modeling research on the extreme hydraulic extension length of horizontal well: impact of formation properties, drilling bit and cutting parameters
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Modeling research on the extreme hydraulic extension length of horizontal well: impact of formation properties, drilling bit and cutting parameters

机译：水平井极端液压延伸长度建模研究：地层性能，钻孔钻头和切割参数的影响

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Horizontal well can increase well productivity and improve the economic benefit, which significantly promotes the development of shale gas, tight oil and heavy oil. Moreover, it plays an important role in the development of natural gas hydrate. Horizontal extension ability is one of the key indexes of horizontal well, but it is always impacted by formation properties and well structure. Therefore, a model is established to analyze the impact of formation properties and well structure as comprehensive as possible, which considers not only traditional influencing factors, like formation pressure and drilling bit parameters, but also other key factors, including cutting particle size, wellbore diameter and cross section. Based on the analysis, some advises are proposed for field application. The analysis indicates that horizontal well has stronger extension ability in the formation with low formation pressure and high fracture pressure, but it is still limited by pump pressure. Under-balanced drilling can strength the extension ability in high formation pressure by reducing drilling mud density. The natural fractures in formation should be noted when drilling long horizontal well. The extension length increases and then decreases with the cutting particle size, so cutting particle has optimal size for the horizontal extension length, which can be adjusted by the rate of penetration and rotation speed. The extension length increases first and then decreases with the gap between drilling string and hole. Considering the demand of rock breaking and cutting sweeping around drilling bit, it is not recommended to adjust the drilling bit parameters. Both the cutting bed height and drilling string eccentricity have impact on horizontal extension length by changing minimum cutting-carry pump rate and annular pressure drop. Under different combinations of above two parameters, minimum cutting-carry pump rate and horizontal extension length are determined by different factors and can be divided into three parts, including acceptable cutting bed height, cutting lifting efficiency, pump pressure and total circulation pressure loss and well bottom pressure and formation fracture pressure. The findings of this study can help for better understanding of horizontal well hydraulic extension length and optimization method.
机译：横向井可以提高生产力良好，提高经济效益，从而显着促进了页岩气，紧身油和重油的发展。此外，它在天然气水合物的发展中起着重要作用。水平扩展能力是水平井的关键索引之一，但总是受到形成性质和井结构的影响。因此，建立了一种模型，以分析形成性能和井结构的影响尽可能全面，这不仅考虑了传统的影响因素，如形成压力和钻孔比特参数，还考虑了其​​他关键因素，包括切割粒度，井筒直径和横截面。根据分析，提出了一些建议用于现场申请。分析表明，水平孔具有较强的形成压力和高裂缝压力，但仍然受到泵压的限制。通过减少钻井泥浆密度，均衡钻孔可以强化高形成压力的延长能力。在钻井长水平井时应注意形成的自然骨折。延伸长度增加然后随着切割粒度的降低，因此切割颗粒具有水平延伸长度的最佳尺寸，这可以通过穿透速度和转速来调节。延伸长度首先增加，然后随着钻柱和孔之间的间隙而减小。考虑到钻孔钻头扫除的岩石破碎和切割的需求，建议不要调整钻头参数。切割床高度和钻柱偏心通过改变最小的切割泵速率和环形压降，对水平延伸长度产生影响。在上述两个参数的不同组合下，最小的切割泵速率和水平延伸长度由不同的因素决定，并且可以分为三个部分，包括可接受的切割床高度，切割提升效率，泵压和总循环压力损失和井底部压力和形成骨折压力。该研究的结果可以帮助更好地理解水平井液压延伸长度和优化方法。

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