### Abstract

The PI of a horizontal well in an anisotropic medium is calculated during a process of partial acidization, in which damage removal occurs over only a fraction of the well length. Two numerical simulators are used in this work: an acidizing simulator, which calculates the permeability distribution around the wellbore; and a reservoir simulator, which calculates the PI of the well. By applying mathematical transformations, it is possible to reduce the acidizing model from a 2D to a 1D problem. By comparing treatment results, it is possible to select the optimal volume of acid, injection rate, and fraction of the length to be acidized for each well. The same procedure also may be applied for vertical wells both with and without anisotropy. Simulation results indicate that the application of a partial acidizing strategy reduces the total amount of acid required for significant improvement in well productivity, substantially reducing the financial, operational, and environmental risks involved in the treatment of a horizontal well. In most cases, the optimal injection rate for sandstone acidizing is the maximum rate that does not fracture the formation.

Original language | English |
---|---|

Pages (from-to) | 142-149 |

Number of pages | 8 |

Journal | SPE Reprint Series |

Issue number | 47 |

Publication status | Published - 1998 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Energy Engineering and Power Technology

### Cite this

*SPE Reprint Series*, (47), 142-149.

**Selective matrix acidizing of horizontal wells.** / Da Motta, Eduardo; Hill, A. D.; Sepehrnoori, Kamy.

Research output: Contribution to journal › Article

*SPE Reprint Series*, no. 47, pp. 142-149.

}

TY - JOUR

T1 - Selective matrix acidizing of horizontal wells

AU - Da Motta, Eduardo

AU - Hill, A. D.

AU - Sepehrnoori, Kamy

PY - 1998

Y1 - 1998

N2 - The PI of a horizontal well in an anisotropic medium is calculated during a process of partial acidization, in which damage removal occurs over only a fraction of the well length. Two numerical simulators are used in this work: an acidizing simulator, which calculates the permeability distribution around the wellbore; and a reservoir simulator, which calculates the PI of the well. By applying mathematical transformations, it is possible to reduce the acidizing model from a 2D to a 1D problem. By comparing treatment results, it is possible to select the optimal volume of acid, injection rate, and fraction of the length to be acidized for each well. The same procedure also may be applied for vertical wells both with and without anisotropy. Simulation results indicate that the application of a partial acidizing strategy reduces the total amount of acid required for significant improvement in well productivity, substantially reducing the financial, operational, and environmental risks involved in the treatment of a horizontal well. In most cases, the optimal injection rate for sandstone acidizing is the maximum rate that does not fracture the formation.

AB - The PI of a horizontal well in an anisotropic medium is calculated during a process of partial acidization, in which damage removal occurs over only a fraction of the well length. Two numerical simulators are used in this work: an acidizing simulator, which calculates the permeability distribution around the wellbore; and a reservoir simulator, which calculates the PI of the well. By applying mathematical transformations, it is possible to reduce the acidizing model from a 2D to a 1D problem. By comparing treatment results, it is possible to select the optimal volume of acid, injection rate, and fraction of the length to be acidized for each well. The same procedure also may be applied for vertical wells both with and without anisotropy. Simulation results indicate that the application of a partial acidizing strategy reduces the total amount of acid required for significant improvement in well productivity, substantially reducing the financial, operational, and environmental risks involved in the treatment of a horizontal well. In most cases, the optimal injection rate for sandstone acidizing is the maximum rate that does not fracture the formation.

UR - http://www.scopus.com/inward/record.url?scp=0031648129&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031648129&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0031648129

SP - 142

EP - 149

JO - SPE Reprint Series

JF - SPE Reprint Series

SN - 0891-0901

IS - 47

ER -