石油与天然气地质 ›› 2001, Vol. 22 ›› Issue (3): 238-239,244.doi: 10.11743/ogg20010310

• 油气空间 • 上一篇    下一篇

二氧化碳吞吐试验中油层堵塞的原因

钱思平1, 杜培敏1, 乔保林1, 周旭煌1, 张秀琼1, 游小淼2, 莫冰1   

  1. 1. 中原油田分公司勘探开发科学研究院, 河南濮阳457001;
    2. 中原油田分公司科技处, 河南濮阳457001
  • 收稿日期:2001-04-15 出版日期:2001-09-25 发布日期:2012-01-16

THE REASON OF RESERVOIR BLOCKAGE IN CO2 SWALLOWING-SPITTING TEST

Qian Siping1, Du Peimin1, Qiao Baolin1, Zhou Xuhuang1, Zhang Xiuqiong1, You Xiaomiao2, Mo Bing1   

  1. 1. Research Institute of Exploration and Development, Zhongyuan Oilfield Company, Puyang, Henan;
    2. Department of Science and Technology, Zhongyuan Oilfield Company, Puyang, Henan
  • Received:2001-04-15 Online:2001-09-25 Published:2012-01-16

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摘要：

二氧化碳吞吐试验中,不明泥状物、油层中的无机物和重质有机物及返排速度均有可能引起油层堵塞.中原油田文65-84井试验结果表明,不明泥状物主要来自井筒和地面,与油层堵塞无直接关系;油层中的无机物主要为碳酸钙,尽管其溶解度随二氧化碳分压的下降而下降,但温度的下降,又会使其溶解度增加,二者综合作用,碳酸钙的溶解度反而上升,所以并不会产生油层堵塞;二氧化碳的注入,使油层温度下降,重质有机物(石蜡、沥青等)析出,从而导致了油层堵塞,因此,因温度下降而析出的重质有机物才是油层堵塞的真正原因.另外,在油层较薄的情况下,大排量返排使得近井地带温度降低,有可能使重质有机物析出而使油层堵塞,因此,在实际中并非返排速度越快越好.

关键词: 二氧化碳, 吞吐试验, 重质有机质, 油层堵塞, 中原油田

Abstract:

In the test of CO2 swallowing spitting made in Zhongyuan Oilfields,a new problem of reservoir blockage near wellbore area has arisen.The test result of Wen 65-84 Well in Zhongyuan Oilfields suggests that unknown mud like matter and inorgamic matter CaCO3 could not cause the reservoir blockage,the dialysis of heavy organic materials (paraffin,bitumen)caused by CO2 injection and the drop dwon of temperature is the real reason of the reservoir blockage.

Key words: CO2, swallowing spitting test, heavy organic matter, oil reservoir blockage,Zhongyuan Oilfields

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