Volume 36 Issue 4
Aug.  2019
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LI Jin, WANG Kunjian, HAN Yaotu, ZHANG Qilong, JIA Lixin. Methods of Predicting and Evaluating Effect of Acidizing Job of Water Injectors in Bohai Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 506-511. doi: 10.3969/j.issn.1001-5620.2019.04.020
Citation: LI Jin, WANG Kunjian, HAN Yaotu, ZHANG Qilong, JIA Lixin. Methods of Predicting and Evaluating Effect of Acidizing Job of Water Injectors in Bohai Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 506-511. doi: 10.3969/j.issn.1001-5620.2019.04.020
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Methods of Predicting and Evaluating Effect of Acidizing Job of Water Injectors in Bohai Oilfield

doi: 10.3969/j.issn.1001-5620.2019.04.020

  • 1. State Key Laboratory of Offshore Oil Exploitation, Tianjin Branch of CNOOC, Tianjin 300459;

  • 2. Tianjin Branch of CNOOC, Tianjin 300459

  • Received Date: 2019-03-05
  • Publish Date: 2019-08-30
    Abstract
  • A study has been conducted in an effort to address the problem of poor acidizing job performed in water projectors in Bohai oilfield. Typical Ⅱ stage projectors with poor acidizing job in Block SZ were selected for studying and data regarding the acidizing job were collected for more than 60 wells/times. Factors affecting the acidizing job quality of the injectors in Bohai oilfield and prediction and evaluation of the job quality were studied using Grey Relational Analysis.The study shows that the acidizing curves of the injectors in Bohai oilfield can be classified mainlyas S-type, double-step-shaped type, average type and rapid-declining type, most of which is the S-type curve. Injectors with S-type curve have the longest time in which the effect of acidizing job remains effective, and injectors with rapid-declining curve have the shortest time in which the effect of acidizing job remains effective. Several factors affecting the effects of augmented acid injection, such as the operational parameters, reservoir data and the blocking of flow channels in the formations, were studied for their importance of affecting the effects of augmented acid injection. The key factors affecting the effects of augmented acid injection were found to be the type of acid and its ability to eroding the blockage, the apparent water injectivity index before acidizing job, acidizing radius, the effective thickness of acidized formation, and the permeability and porosity of formations. A model has been established for predicting and evaluating the effective period of an acidizing job and the cumulative volume of acid solution injected. The study can be used to predict and evaluate the effect of acidizing job and is helpful to the optimization of acidizing program for injectors. By prolonging the effective period of an acidizing job and increasing the cumulative volume of acid solution injected, the effect of an acidizing job can be ensured, contributing to the realization of stabilizing petroleum production at 30 million tons per year in Bohai oilfield.

     

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