裂缝地层随钻刚性颗粒封堵机理与估算模型

doi:10.7623/syxb201103022

石油学报 ›› 2011, Vol. 32 ›› Issue (3): 509-513.DOI: 10.7623/syxb201103022

裂缝地层随钻刚性颗粒封堵机理与估算模型

李家学黄进军罗平亚杨莉鲁亿

西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500

收稿日期:2010-10-05 修回日期:2010-12-28 出版日期:2011-05-25 发布日期:2011-07-19
通讯作者: 李家学
作者简介:李家学，男，1979年12月生，2008年获西南石油大学硕士学位，现为西南石油大学在读博士研究生，主要从事油气井工作液和堵漏技术研究。
基金资助:
国家重点基础研究发展规划（973）项目（2010CB226705）资助。

Plugging mechanism and estimation models of rigid particles while drilling in fracture formations

LI Jiaxue HUANG Jinjun LUO Pingya YANG Li LU Yi

Received:2010-10-05 Revised:2010-12-28 Online:2011-05-25 Published:2011-07-19

摘要/Abstract

摘要：

在裂缝发育地层的随钻防漏技术中，凭经验选择防漏剂颗粒往往出现与地层裂缝的要求不相匹配的情况。为了解决该问题，优选出符合防漏要求的以碳酸钙为主要成分的刚性颗粒防漏剂，并提出了刚性颗粒对裂缝的封堵机理。该理论指出，刚性颗粒在裂缝端口处形成填塞层，隔断了裂缝中的钻井液，消除了作用在裂缝壁面上钻井液压力，实现了稳定封堵，提高了地层承压能力。根据该理论建立了各级刚性颗粒的粒径选择模型和浓度估算模型，并进行了实例计算。

关键词: 刚性颗粒, 封堵机理, 颗粒粒径, 颗粒浓度, 估算模型, 随钻防漏, 裂缝地层

Abstract:

The size and concentration of the loss control materials(LCMs) used in the leak resistance while drilling for fracture-developed formations, are determined mainly by operators’ experience and may not match with the fracture of formations. In order to solve this problem, the present paper suggested to use a special LCM called rigid particles that were mainly composed of calcium carbonate and accorded with the demand of leak resistance. Meanwhile, the paper proposed a plugging mechanism of rigid particles for fractures. This mechanism proposed that rigid particles could form a plugging layer at the terminal of fractures to eliminate the pressure of drilling fluids on walls of fractures by obstructing the drilling fluid within fractures, which plugged fractures stably and increased the pressure-bearing capacity of formations. Various models of the size selection and concentration estimation for multi-grade rigid particles were established based on this mechanism and adopted to example computation. The study results were useful in guiding field operation, enriched and improved leak-resistance and plugging-while-drilling techniques of rigid particles for fracture-developed formations.

Key words: rigid particle, plugging mechanism, particle size, particle concentration, estimation model, leak resistance while drilling, fracture formation

李家学黄进军罗平亚杨莉鲁亿. 裂缝地层随钻刚性颗粒封堵机理与估算模型[J]. 石油学报, 2011, 32(3): 509-513.

LI Jiaxue HUANG Jinjun LUO Pingya YANG Li LU Yi. Plugging mechanism and estimation models of rigid particles while drilling in fracture formations[J]. Editorial office of ACTA PETROLEI SINICA, 2011, 32(3): 509-513.

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裂缝地层随钻刚性颗粒封堵机理与估算模型

Plugging mechanism and estimation models of rigid particles while drilling in fracture formations

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