Volume 33 Issue 4
Jul.  2016
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DUAN Guifu, SHEN Hua, HE Chunming, CHENG Xiaodong, YU Fang, MU Hailin, AN Yuepeng. Diverting Acid Used for Acidizing Tight Marlstone Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(4): 101-104. doi: 10.3969/j.issn.1001-5620.2016.04.021
Citation: DUAN Guifu, SHEN Hua, HE Chunming, CHENG Xiaodong, YU Fang, MU Hailin, AN Yuepeng. Diverting Acid Used for Acidizing Tight Marlstone Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(4): 101-104. doi: 10.3969/j.issn.1001-5620.2016.04.021

Diverting Acid Used for Acidizing Tight Marlstone Reservoir

doi: 10.3969/j.issn.1001-5620.2016.04.021
  • Received Date: 2016-03-22
  • Publish Date: 2016-07-31
  • In improving the tight marlstone reservoir in Shulu sag, problems such as high operation pressure, short improving distance and low conductivity have been frequently encountered. A newself-diverting acid formulation was developed for use in stimulation jobs to try to solve the problems as described above. Evaluation of the viscosity, elasticity, rheological and gel-breaking performances of the self-diverting acids was performed through laboratory experiment. Communicating of fractures in the reservoir formations by acids was conducted through core flow experiment. The evaluation demonstrates that the self-diverting acid causes low damage to reservoir formations, the gels are easy to break, and the acid is evenly distributed. When the residue acid had its concentration decreased to 5%, the viscosity of the acid can be 96 mPa²s. The acid can go laterally to make the natural fractures communicated extensively, satisfying the needs to improve the marlstone reservoir. Comparison of the conductivities of the fractures using different improvement techniques resulted in a volumetric stimulation model suitable for marlstone reservoir improvement, a model integrating diverting acid fracturing and fracturing with sand. This technology has been used in the improvement of three wells (15 segments), obtaining stable daily production rate that is 10 times of the old wells.

     

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