### Abstract

The productivity index of a horizontal well in an anisotropic medium is calculated during a process of partial acidization, in which damage removal occurs only over a fraction of the length of the well. 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 productivity index of the well. By applying mathematical transformations, it was possible to reduce the acidizing model from a 2D problem to a 1D one. 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 particular well. The same procedure may also 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 a significant improvement in well productivity. This may substantially reduce 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 which does not fracture the formation.

Original language | English |
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Title of host publication | Proceedings - SPE International Symposium on Formation Damage Control |

Publisher | Publ by Society of Petroleum Engineers (SPE) |

Pages | 535-548 |

Number of pages | 14 |

Publication status | Published - 1994 |

Externally published | Yes |

Event | Proceedings of the International Symposium on Formation Damage Control - Lafayette, LA, USA Duration: 9 Feb 1994 → 10 Feb 1994 |

### Other

Other | Proceedings of the International Symposium on Formation Damage Control |
---|---|

City | Lafayette, LA, USA |

Period | 9/2/94 → 10/2/94 |

### Fingerprint

### ASJC Scopus subject areas

- Geology

### Cite this

*Proceedings - SPE International Symposium on Formation Damage Control*(pp. 535-548). Publ by Society of Petroleum Engineers (SPE).

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings - SPE International Symposium on Formation Damage Control.*Publ by Society of Petroleum Engineers (SPE), pp. 535-548, Proceedings of the International Symposium on Formation Damage Control, Lafayette, LA, USA, 9/2/94.

}

TY - GEN

T1 - Selective matrix acidizing of horizontal wells

AU - Da Motta, Eduardo

AU - Hill, A. D.

AU - Sepehrnoori, Kamy

PY - 1994

Y1 - 1994

N2 - The productivity index of a horizontal well in an anisotropic medium is calculated during a process of partial acidization, in which damage removal occurs only over a fraction of the length of the well. 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 productivity index of the well. By applying mathematical transformations, it was possible to reduce the acidizing model from a 2D problem to a 1D one. 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 particular well. The same procedure may also 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 a significant improvement in well productivity. This may substantially reduce 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 which does not fracture the formation.

AB - The productivity index of a horizontal well in an anisotropic medium is calculated during a process of partial acidization, in which damage removal occurs only over a fraction of the length of the well. 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 productivity index of the well. By applying mathematical transformations, it was possible to reduce the acidizing model from a 2D problem to a 1D one. 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 particular well. The same procedure may also 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 a significant improvement in well productivity. This may substantially reduce 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 which does not fracture the formation.

UR - http://www.scopus.com/inward/record.url?scp=0028315786&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028315786&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0028315786

SP - 535

EP - 548

BT - Proceedings - SPE International Symposium on Formation Damage Control

PB - Publ by Society of Petroleum Engineers (SPE)

ER -