钻完井作业后返排与否造成的不同储层伤害对比

刘长龙; 张丽平; 兰夕堂; 孟祥海; 邹剑; 符扬洋; 张璐

doi:10.3969/j.issn.1001-5620.2017.05.023

钻完井作业后返排与否造成的不同储层伤害对比

doi: 10.3969/j.issn.1001-5620.2017.05.023

刘长龙^1,2,
张丽平¹,
兰夕堂¹,
孟祥海^1,2,
邹剑^1,2,
符扬洋¹,
张璐¹

1. 中海石油(中国)有限公司天津分公司, 天津 300452;
2. 海洋石油高效开发国家重点实验室, 天津 300452

基金项目:

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。

详细信息

作者简介:
刘长龙,1981年生,现在主要从事与油田增产措施相关研究工作。电话15822902973;E-mail:jianghaike007@qq.com。

中图分类号: TE258
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出版历程
- 收稿日期: 2017-07-02
- 刊出日期: 2017-09-30

Flow Back or Not after Well Completion: Comparison of Their Impact on Formation Damage in Different

1. Tianjin Branch of CNOOC Ltd, Tianjin 300452;
2. State Key Laboratory of Offshore Oil Exploitation, Tianjin 300452

摘要

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。
- 注水井 /
- 钻井完井液 /
- 储层伤害 /
- 返排 /
- 渗透率
Abstract: Bohai oilfield has long been developed with water injection. Some water injectors are directly put into injection without flowback because of special environmental requirements and time limit, resulting in high injection pressure and deficiency in injection rate. A study has been conducted to resolve this problem, focusing on whether a well was flowed back or not in the early stage. Differences between formation damage caused by the two operations (flow back or not flow back) were extensively analyzed from the types of formation damage and formation damage mechanisms. Extent of formation damage and effects of formation damage by drilling fluid on water injection in late stage were studied. The study showed that drilling and completion fluids caused formation damage in two ways, retention and adsorption of chemicals. Formation damage caused by retention is a reversible process and can to some extent be relieved, formation damage caused by adsorption, on the other hand, is an irreversible process. Laboratory experiments showed that well flowback greatly reduces permeability impairment by drilling and completion fluids. Formation damage caused by drilling and completion fluids is not just a decrease in permeability by retention and adsorption; it also is concerned with the alteration of the properties of rock surfaces which in turn affects water injection in late stage.
- Water injector /
- Drilling and completion fluid /
- Formation damage /
- Flow back /
- Permeability

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