钻完井作业后返排与否造成的不同储层伤害对比

发布时间：2019-06-26 09:47

【摘要】：渤海油田主要采用注水开发模式,由于受特殊环境及紧迫时效的要求,部分注水井钻完井作业后不返排直接注水,往往造成注入压力高、严重欠注等问题。针对此问题,研究过程中立足于前期是否返排情况,从钻完井液的伤害类型及机理入手,深入剖析2种条件下产生伤害的差异性,开展钻完井液伤害实验对比,分析不同情况形成的伤害程度,同时进一步探求钻完井液伤害对后期注水产生的影响。研究结果表明,钻完井液伤害可分为滞留、吸附2种,滞留伤害可通过返排得到一定程度解除属于可逆过程,而吸附伤害为不可逆过程;对比实验表明,返排过程有利于大幅度降低钻完井液对储层渗透率的伤害;钻完井液形成的伤害并不是简单吸附滞留造成的储层渗透率降低,还与岩石表面性质发生改变有关,从而影响后期注水作业。
[Abstract]:Water injection development mode is mainly used in Bohai Oilfield. Due to the requirements of special environment and urgent aging, some water injection wells do not return to discharge direct water injection after drilling, which often leads to high injection pressure, serious underinjection and so on. In order to solve this problem, based on whether or not the drilling and completion fluid is discharged in the early stage, starting from the damage type and mechanism of drilling and completion fluid, the difference of damage caused by drilling and completion fluid under the two conditions is deeply analyzed, the damage experiment of drilling and completion fluid is carried out, the damage degree formed by different conditions is analyzed, and the influence of drilling and completion fluid injury on later water injection is further explored. The results show that the damage of drilling and completion fluid can be divided into two kinds of retention and adsorption, and the residual damage can be relieved to a certain extent by backflow, while the adsorption damage is irreversible. The comparative experiments show that the process of drilling and completion fluid is beneficial to greatly reduce the damage of drilling and completion fluid to reservoir permeability. The damage caused by drilling and completion fluid is not only the decrease of reservoir permeability caused by simple adsorption and retention, but also related to the change of rock surface properties, which affects the later water injection operation.
【作者单位】：中海石油(中国)有限公司天津分公司;海洋石油高效开发国家重点实验室;
【基金】：国家科技重大专项“渤海油田高效开发示范工程”课题(2016ZX05058-003)资助
【分类号】：TE258

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