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Title: Improved Miscible Nitrogen Flood Performance Utilizing Advanced Reservoir Characterization and Horizontal Laterals in a Class I Reservoir -- East Binger (Marchand) Unit

Abstract

A significant work program was implemented from 2002 to 2005 in the East Binger Unit (''EBU'') miscible nitrogen injection project in an effort to reduce gas cycling and economically increase ultimate oil recovery. This work included the drilling of new wells, both horizontal and vertical, as well as pattern realignment through producer-to-injector conversions. Monitoring of overall performance of the pilot area continues. Response to the various projects continues to be very favorable. Injection into the pilot area, despite being limited at times by problems in the Air Separation Unit of the Nitrogen Management Facility, has increased an average of 50% over levels prior to the project. Meanwhile, gas production and nitrogen content of produced gas have both decreased. After decreasing to 20-25% early in the project, nitrogen recycle (produced nitrogen volume divided by injected nitrogen volume) within the pilot area has risen back to about 42%, still far below the 72% prior to initiation of the project. Poor areal sweep efficiency appears to be the primary cause of nitrogen cycling. Seven vertical and three horizontal wells have been drilled in the pilot area throughout the project, and most have had initial produced gas oil ratios and gas nitrogen contents significantlymore » below the field averages. Given similar reservoir conditions of net thickness and gas sweep, vertical wells are performing nearly as well as horizontal wells. Additional vertical well drilling was completed in 2005 following the success of wells drilled from 2002 through 2004.« less

Authors:
Publication Date:
Research Org.:
Binger Operations, LLC
Sponsoring Org.:
USDOE
OSTI Identifier:
878292
DOE Contract Number:
FC26-00BC15121
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; AIR; DRILLING; FLOODS; GAS OILS; MANAGEMENT; MONITORING; NITROGEN; PERFORMANCE; PRODUCTION; PROGRESS REPORT; SWEEP EFFICIENCY; THICKNESS; WELL DRILLING

Citation Formats

Joe Sinner. Improved Miscible Nitrogen Flood Performance Utilizing Advanced Reservoir Characterization and Horizontal Laterals in a Class I Reservoir -- East Binger (Marchand) Unit. United States: N. p., 2006. Web. doi:10.2172/878292.
Joe Sinner. Improved Miscible Nitrogen Flood Performance Utilizing Advanced Reservoir Characterization and Horizontal Laterals in a Class I Reservoir -- East Binger (Marchand) Unit. United States. doi:10.2172/878292.
Joe Sinner. Thu . "Improved Miscible Nitrogen Flood Performance Utilizing Advanced Reservoir Characterization and Horizontal Laterals in a Class I Reservoir -- East Binger (Marchand) Unit". United States. doi:10.2172/878292. https://www.osti.gov/servlets/purl/878292.
@article{osti_878292,
title = {Improved Miscible Nitrogen Flood Performance Utilizing Advanced Reservoir Characterization and Horizontal Laterals in a Class I Reservoir -- East Binger (Marchand) Unit},
author = {Joe Sinner},
abstractNote = {A significant work program was implemented from 2002 to 2005 in the East Binger Unit (''EBU'') miscible nitrogen injection project in an effort to reduce gas cycling and economically increase ultimate oil recovery. This work included the drilling of new wells, both horizontal and vertical, as well as pattern realignment through producer-to-injector conversions. Monitoring of overall performance of the pilot area continues. Response to the various projects continues to be very favorable. Injection into the pilot area, despite being limited at times by problems in the Air Separation Unit of the Nitrogen Management Facility, has increased an average of 50% over levels prior to the project. Meanwhile, gas production and nitrogen content of produced gas have both decreased. After decreasing to 20-25% early in the project, nitrogen recycle (produced nitrogen volume divided by injected nitrogen volume) within the pilot area has risen back to about 42%, still far below the 72% prior to initiation of the project. Poor areal sweep efficiency appears to be the primary cause of nitrogen cycling. Seven vertical and three horizontal wells have been drilled in the pilot area throughout the project, and most have had initial produced gas oil ratios and gas nitrogen contents significantly below the field averages. Given similar reservoir conditions of net thickness and gas sweep, vertical wells are performing nearly as well as horizontal wells. Additional vertical well drilling was completed in 2005 following the success of wells drilled from 2002 through 2004.},
doi = {10.2172/878292},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 23 00:00:00 EST 2006},
month = {Thu Mar 23 00:00:00 EST 2006}
}

Technical Report:

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  • Work associated with Budget Period 1 of the East Binger (Marchand) Unit project is nearing completion. A major aspect of this project is accurate modeling of the performance of horizontal wells. Well EBU 37-3H, the first horizontal well drilled in the unit, was drilled in the second quarter of 2001. After much difficulty establishing economic production from the well, the well was hydraulically fractured in November 2001. Post-treatment production has been very encouraging and is significantly better than a vertical well drilled in a similar setting. International Reservoir Technologies, Inc. has completed the final history match of the pilot areamore » reservoir simulation model, including tuning to the performance of the horizontal well. The model's predicted reservoir pressure gradient between injection and production wells accurately matches observed data from the field, a significant improvement from prior model predictions. The model's predicted gas injection profiles now also more accurately match field data. Work has begun toward evaluating the optimum development scenario with the pilot model. Initially, four scenarios will be evaluated--two involving all horizontal infill wells, one involving all vertical infill wells, and one involving a combination of vertical and horizontal infill wells. The model cases for these scenarios have been defined, and construction of them is underway.« less
  • Implementation of the work program of Budget Period 2 of the East Binger Unit (''EBU'') DOE Project continues. Major development work planned for the project includes the drilling of three horizontal production and one vertical injection wells, the conversion of five wells from production to injection service, and the expansion of injection capacity at the nitrogen management facility. Other work items include initiation of project monitoring and continued reservoir simulation. EBU 74G-2, the injection well planned to support the production of EBU 64-3H, has been drilled. Completion was underway at the time of this report. EBU 64-3H was fracture-stimulated duringmore » the period, further increasing production from this new horizontal well. Drilling of the final two wells of the pilot project is planned for 2003. Both are planned as horizontal producing wells. Work also began on projects aimed at increasing injection in the pilot area. The project to add compression and increase injection capacity at the nitrogen management facility was initiated, with completion targeted for March 2003. Additional producer-to-injector conversions are expected to be implemented around the same time. The revised history match of the simulation model has been completed, and work has begun to evaluate options with forecast simulations. The quality of the history match is significantly improved over the prior match. The predicted distribution of remaining reserves in the field is significantly changed. Decisions on projects planned for implementation later in Budget Period 2 will be guided by new forecasts.« less
  • The cooperative agreement for this project was finalized and signed during April 2000. The official project start date was April 11, 2000. Initial reporting requirements, including the completion of a Project Management Plan, Milestone Plan and Log, and a Hazardous Substance Plan, were completed and submitted to the DOE in early May 2000. Work on the project tasks was initiated in May 2000. During the course of this budget period, efforts will focus on enhancing reservoir characterization work that had been in progress prior to the start of this grant project, incorporation of this information into an existing 3-D full-fieldmore » compositional model, and utilization of a ''window area'' of the model (representing a selected pilot area) to evaluate the impacts of horizontal laterals on recovery in the miscible nitrogen flood. The ''window area'' model will also be used to design the most effective configuration and placement of the lateral sections. The following is a summary of progress made between April 11, 2000 and June 30, 2000.« less
  • The first horizontal well ever in the Marchand sandstone has been drilled. Although major difficulties arose with certain aspects of the drilling operation, a horizontal section of approximately 1300 was drilled. The section was left open hole as planned. The shales just above and between the Marchand sands appear to be very water-sensitive, requiring careful drilling practices. These shales were encountered in the middle part of the curve (45{sup o}-60{sup o}), which can be the most difficult part of a directional well to clean. Difficulties with these shales and cleaning this section led to a parted drill string, requiring amore » sidetrack. There were no major geologic ''surprises'', such as formation tops coming in much shallower or deeper than expected, or unexpected faults. Thin kaolinite beds were encountered in the horizontal section of the well. Previous descriptions of the mineralogy of this formation did not mention any kaolinite. The lateral extent of these beds is unknown. Completion of the well is under way. One additional injection profile was gathered during the quarter. Results are consistent with other recently profiles that show gas within the C Sand is overriding the oil and failing to sweep the deeper parts of the reservoir. International Reservoir Technologies, Inc. has completed the construction of the pilot area reservoir simulation model and the updating of historical production and injection data. They have begun fine-tuning the history match to better match production data and recently acquired pressure and profile data.« less
  • Progress on the East Binger Unit (EBU) project has slowed as difficulties have been encountered with obtaining satisfactory production from well EBU 37G-3H, the new horizontal well. Remedial operations have been conducted and stimulation operations were about to get under way at the end of the reporting period. International Reservoir Technologies, Inc. has made additional progress on the pilot area simulation model, reaching a point with the history match that we are awaiting more definitive production data from the horizontal well. Planning future development of the EBU hinges on evaluating the results of well EBU 37G-3H. Performance of this wellmore » must be understood in order to evaluate development scenarios involving horizontal wells and compare them with development scenarios involving vertical wells.« less