大牛地马家沟组储层酸压残酸规律研究
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1.中国石化华北油气分公司石油工程技术研究院;2.中国石油大学(北京);3.中国石油大学(北京)石油工程教育部重点实验室

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TE343

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The Damage Mechanism of Spent Acid in Acid Fracturing of Majiagou Formation in Daniudi Gas Field
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1.Research Institute of Petroleum Engineering and Technology, North China Oil &2.Gas Company

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    摘要:

    酸压施工中经过酸岩反应后残留在地层的酸液,破胶后仍能吸附、滞留和堵塞岩石孔隙,对储层造成伤害,影响了储层渗流能力,导致单井产能和经济效益降低。为明确大牛地马家沟组碳酸盐岩储层残酸伤害的影响,通过配置施工酸液体系,开展了对基质、微裂缝和酸蚀裂缝三种形态的残酸伤害实验,且从微观和宏观角度分析其伤害规律。研究结果表明:残酸对基质伤害较高,残酸进入基质,以堵塞孔隙形式污染岩心,残酸伤害率30%左右;微裂缝次之,残酸滞留微裂缝表面,且渗透率越大,伤害越小,残酸伤害率10%~20%之间;酸蚀裂缝几乎没有受到残酸伤害影响。因此,残酸伤害主要以堵塞伤害为主,吸附伤害较低,影响较小。

    Abstract:

    The acid solution remaining in the formation after acid rock reaction in acid compression construction can still adsorb, retain and block rock pores after glue breaking, causing damage to the reservoir, affecting the seepage capacity of the reservoir, leading to the reduction of single well productivity and economic benefits. In order to clarify the influence of residual acid damage on carbonate reservoir of Majiagou Formation in Daniudi gasfield, the residual acid damage experiments on matrix, micro fracture and acid erosion fracture were carried out through the configuration and construction of acid system, and the damage laws were analyzed from micro and macro perspectives. The experimental results show that residual acid has a high damage rate to matrix. Residual acid enters matrix and pollutes core in the form of clogging pores, and the damage rate of residual acid is about 30%. The residual acid remains on the surface of micro-cracks, and the greater the permeability, the less damage; residual acid damage rate is between 10% and 20%.Acid; etched cracks are almost unaffected by residual acid. Therefore, the damage of residual acid is mainly caused by blockage, and the adsorption damage is relatively low.

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张永春,夏熙,牟建业. 大牛地马家沟组储层酸压残酸规律研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-11-23
  • 最后修改日期:2022-04-26
  • 录用日期:2022-04-30
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