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Mechanism Analysis of Casing Damage Induced by High Pressure Water Injection in Daqing Oilfield

机译：大庆油田高压注水致套管损坏机理分析

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摘要

Well casing damage is a commonly existing problem in oilfield exploitation in the world. Daqing oilfield is a multiple-zone, heterogeneity sandstone oilfield, where the major influence factors which lead to casing damage are geologic factor, engineering factor, high pressure water injection and chemical factors. Among them, the high pressure water injection is the most important one. Water injection exploitation in Daqing oilfield showed that casing-damage increased with the increasing water injection pressure. However, the mechanism is not totally understood and the control method is not well developed yet. In the present work, the mechanism analysis of casing damage induced by high pressure water injection in Daqing oilfield is proposed. It is found that after high pressure water injection, the sandstone layer will expand and result in the vertical elongation of the casing. The additive tensile stress of the casing induced by vertical strains will cause casing-damage. Besides, the horizontal deformation of clay-stone increases with increasing water content of the formation layers and soaking time. The cohesion of clay-stone and inner friction angle decreased with increasing water quantity. In that case, some high obliquity formation layers which may induce high hypsography pressure difference will cause localized slip along weak formation layer interface in the area of waterishlogged clay-stone. Casing damage and well failure caused by the relative movement of the formation layer interface may therefore occur. The micro-fracture of formation induced by high pressure water injection also educed formation rupture and casing damage.
机译：套管损坏是世界上油田开发中普遍存在的问题。大庆油田是多区非均质砂岩油田，造成套管损坏的主要影响因素是地质因素，工程因素，高压注水和化学因素。其中，高压注水是最重要的一种。大庆油田注水开发表明，随注水压力的增加，套管损伤增加。但是，其机理尚不完全清楚，其控制方法还不够完善。本文对大庆油田高压注水对套管的破坏机理进行了分析。发现高压注水后，砂岩层将膨胀并导致套管的垂直伸长。由垂直应变引起的套管的附加拉伸应力将导致套管损坏。此外，粘土岩的水平变形随着地层含水量的增加和浸泡时间的增加而增加。粘土石的内聚力和内摩擦角随水量的增加而减小。在那种情况下，一些可能引起较高的海底层析压力差的高倾角地层会导致在含水泛滥的粘土-石区域中沿着弱的地层界面发生局部滑移。因此，可能会发生由地层界面的相对运动引起的套管损坏和井眼故障。高压注水引起的地层微裂缝也引起地层破裂和套管损坏。

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