The keys to successfully acidizing horizontal injection wells in the Marlim Sul field

Mário Germino Ferreira Da Silva, Agostinho Calderon, Eduardo Da Motta

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

This paper presents field data from the acidizing of several horizontal, gravel-packed, water injection wells in the deepwater field of Marlim Sul, Campos Basin, Brazil. We describe the keys to the strategy that led us to achieve highly successful results, which involved changes in the composition of the drill-in fluids (DIF), the use controlled acidizing parameters and special acidizing tools that provide mechanical diversion, and modifications in the conventional acidizing program, that made fluids compatible with the acidizing tools. Since the main type of damage present in the wells is the mudcake from the DIF, small acid volumes are able to remove all damage. The small damage penetration also recommends low injection rates, instead of the traditional high rates that would not provide enough contact time to dissolve the damage and would create preferential paths for the acid. Before the use of the new strategy, the injections wells in Marlim Sul were treated with regular wash pipes, with no guarantee of mechanical diversion, and poor results. After starting to use specially designed acidizing tools (one-trip or straddle packer), and to minimize solids and filtrate in the DIF, the average completion efficiency (CE) after the treatments became 77%, what delivered injectivity indexes far above the injection quotas defined by reservoir engineering. A subsequent improvement was to start acidizing the whole horizontal section, instead of only the points of higher damage, as shown by the flowmeter logs. This has made the final completion efficiencies come very close to 100% for all treatments. As a consequence of that, and of the good results also obtained in the producer wells, the production platform P-40 became overloaded with oil and a new production facility, FPSO-Marlim Sul, had to be added to the project to accommodate the extra oil. Due to the good results obtained, all the other deepwater fields at the Campos basin adopted the same strategy for acidizing their horizontal injectors. The outline of the strategy presented in this paper may be helpful for improving the results of acidizing jobs of horizontal water injectors in similar offshore fields around the world. The pioneer application of special acidizing tools, the modifications in the DIF composition, and the use of controlled acidizing parameters constitute very important advances for the complex task of acidizing horizontal wells.

Original languageEnglish
Title of host publication2004 SPE Annual Technical Conference and Exhibition Proceedings
Pages1591-1595
Number of pages5
Publication statusPublished - 2004
Externally publishedYes
Event2004 SPE Annual Technical Conference and Exhibition - Houston, TX, United States
Duration: 26 Sep 200429 Sep 2004

Other

Other2004 SPE Annual Technical Conference and Exhibition
CountryUnited States
CityHouston, TX
Period26/9/0429/9/04

Fingerprint

Fluids
Production platforms
Packers
Acids
Water injection
Flowmeters
Horizontal wells
Gravel
Chemical analysis
Pipe
Water
Oils

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Da Silva, M. G. F., Calderon, A., & Da Motta, E. (2004). The keys to successfully acidizing horizontal injection wells in the Marlim Sul field. In 2004 SPE Annual Technical Conference and Exhibition Proceedings (pp. 1591-1595). [SPE 90158]

The keys to successfully acidizing horizontal injection wells in the Marlim Sul field. / Da Silva, Mário Germino Ferreira; Calderon, Agostinho; Da Motta, Eduardo.

2004 SPE Annual Technical Conference and Exhibition Proceedings. 2004. p. 1591-1595 SPE 90158.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Da Silva, MGF, Calderon, A & Da Motta, E 2004, The keys to successfully acidizing horizontal injection wells in the Marlim Sul field. in 2004 SPE Annual Technical Conference and Exhibition Proceedings., SPE 90158, pp. 1591-1595, 2004 SPE Annual Technical Conference and Exhibition, Houston, TX, United States, 26/9/04.
Da Silva MGF, Calderon A, Da Motta E. The keys to successfully acidizing horizontal injection wells in the Marlim Sul field. In 2004 SPE Annual Technical Conference and Exhibition Proceedings. 2004. p. 1591-1595. SPE 90158
Da Silva, Mário Germino Ferreira ; Calderon, Agostinho ; Da Motta, Eduardo. / The keys to successfully acidizing horizontal injection wells in the Marlim Sul field. 2004 SPE Annual Technical Conference and Exhibition Proceedings. 2004. pp. 1591-1595
@inproceedings{682c7211d0d04a7f97419b3d372953d1,
title = "The keys to successfully acidizing horizontal injection wells in the Marlim Sul field",
abstract = "This paper presents field data from the acidizing of several horizontal, gravel-packed, water injection wells in the deepwater field of Marlim Sul, Campos Basin, Brazil. We describe the keys to the strategy that led us to achieve highly successful results, which involved changes in the composition of the drill-in fluids (DIF), the use controlled acidizing parameters and special acidizing tools that provide mechanical diversion, and modifications in the conventional acidizing program, that made fluids compatible with the acidizing tools. Since the main type of damage present in the wells is the mudcake from the DIF, small acid volumes are able to remove all damage. The small damage penetration also recommends low injection rates, instead of the traditional high rates that would not provide enough contact time to dissolve the damage and would create preferential paths for the acid. Before the use of the new strategy, the injections wells in Marlim Sul were treated with regular wash pipes, with no guarantee of mechanical diversion, and poor results. After starting to use specially designed acidizing tools (one-trip or straddle packer), and to minimize solids and filtrate in the DIF, the average completion efficiency (CE) after the treatments became 77{\%}, what delivered injectivity indexes far above the injection quotas defined by reservoir engineering. A subsequent improvement was to start acidizing the whole horizontal section, instead of only the points of higher damage, as shown by the flowmeter logs. This has made the final completion efficiencies come very close to 100{\%} for all treatments. As a consequence of that, and of the good results also obtained in the producer wells, the production platform P-40 became overloaded with oil and a new production facility, FPSO-Marlim Sul, had to be added to the project to accommodate the extra oil. Due to the good results obtained, all the other deepwater fields at the Campos basin adopted the same strategy for acidizing their horizontal injectors. The outline of the strategy presented in this paper may be helpful for improving the results of acidizing jobs of horizontal water injectors in similar offshore fields around the world. The pioneer application of special acidizing tools, the modifications in the DIF composition, and the use of controlled acidizing parameters constitute very important advances for the complex task of acidizing horizontal wells.",
author = "{Da Silva}, {M{\'a}rio Germino Ferreira} and Agostinho Calderon and {Da Motta}, Eduardo",
year = "2004",
language = "English",
pages = "1591--1595",
booktitle = "2004 SPE Annual Technical Conference and Exhibition Proceedings",

}

TY - GEN

T1 - The keys to successfully acidizing horizontal injection wells in the Marlim Sul field

AU - Da Silva, Mário Germino Ferreira

AU - Calderon, Agostinho

AU - Da Motta, Eduardo

PY - 2004

Y1 - 2004

N2 - This paper presents field data from the acidizing of several horizontal, gravel-packed, water injection wells in the deepwater field of Marlim Sul, Campos Basin, Brazil. We describe the keys to the strategy that led us to achieve highly successful results, which involved changes in the composition of the drill-in fluids (DIF), the use controlled acidizing parameters and special acidizing tools that provide mechanical diversion, and modifications in the conventional acidizing program, that made fluids compatible with the acidizing tools. Since the main type of damage present in the wells is the mudcake from the DIF, small acid volumes are able to remove all damage. The small damage penetration also recommends low injection rates, instead of the traditional high rates that would not provide enough contact time to dissolve the damage and would create preferential paths for the acid. Before the use of the new strategy, the injections wells in Marlim Sul were treated with regular wash pipes, with no guarantee of mechanical diversion, and poor results. After starting to use specially designed acidizing tools (one-trip or straddle packer), and to minimize solids and filtrate in the DIF, the average completion efficiency (CE) after the treatments became 77%, what delivered injectivity indexes far above the injection quotas defined by reservoir engineering. A subsequent improvement was to start acidizing the whole horizontal section, instead of only the points of higher damage, as shown by the flowmeter logs. This has made the final completion efficiencies come very close to 100% for all treatments. As a consequence of that, and of the good results also obtained in the producer wells, the production platform P-40 became overloaded with oil and a new production facility, FPSO-Marlim Sul, had to be added to the project to accommodate the extra oil. Due to the good results obtained, all the other deepwater fields at the Campos basin adopted the same strategy for acidizing their horizontal injectors. The outline of the strategy presented in this paper may be helpful for improving the results of acidizing jobs of horizontal water injectors in similar offshore fields around the world. The pioneer application of special acidizing tools, the modifications in the DIF composition, and the use of controlled acidizing parameters constitute very important advances for the complex task of acidizing horizontal wells.

AB - This paper presents field data from the acidizing of several horizontal, gravel-packed, water injection wells in the deepwater field of Marlim Sul, Campos Basin, Brazil. We describe the keys to the strategy that led us to achieve highly successful results, which involved changes in the composition of the drill-in fluids (DIF), the use controlled acidizing parameters and special acidizing tools that provide mechanical diversion, and modifications in the conventional acidizing program, that made fluids compatible with the acidizing tools. Since the main type of damage present in the wells is the mudcake from the DIF, small acid volumes are able to remove all damage. The small damage penetration also recommends low injection rates, instead of the traditional high rates that would not provide enough contact time to dissolve the damage and would create preferential paths for the acid. Before the use of the new strategy, the injections wells in Marlim Sul were treated with regular wash pipes, with no guarantee of mechanical diversion, and poor results. After starting to use specially designed acidizing tools (one-trip or straddle packer), and to minimize solids and filtrate in the DIF, the average completion efficiency (CE) after the treatments became 77%, what delivered injectivity indexes far above the injection quotas defined by reservoir engineering. A subsequent improvement was to start acidizing the whole horizontal section, instead of only the points of higher damage, as shown by the flowmeter logs. This has made the final completion efficiencies come very close to 100% for all treatments. As a consequence of that, and of the good results also obtained in the producer wells, the production platform P-40 became overloaded with oil and a new production facility, FPSO-Marlim Sul, had to be added to the project to accommodate the extra oil. Due to the good results obtained, all the other deepwater fields at the Campos basin adopted the same strategy for acidizing their horizontal injectors. The outline of the strategy presented in this paper may be helpful for improving the results of acidizing jobs of horizontal water injectors in similar offshore fields around the world. The pioneer application of special acidizing tools, the modifications in the DIF composition, and the use of controlled acidizing parameters constitute very important advances for the complex task of acidizing horizontal wells.

UR - http://www.scopus.com/inward/record.url?scp=22044455423&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=22044455423&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:22044455423

SP - 1591

EP - 1595

BT - 2004 SPE Annual Technical Conference and Exhibition Proceedings

ER -