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The JRG Team at Work


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Reservoir Modelling


JRG Energy was contracted to provide the reservoir modelling for a geothermal energy supply project in the Gippsland Basin. A comprehensive Leapfrog geological model was used to build the mesh for the reservoir modelling. The model was then calibrated in Natural State against 40 existing wells with temperature data. The high gradients in parts of the model (up to 150°C/km) where resolved well using a highly refined Waiwera model.


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Thermal Gradient Well


JRG Energy designed and project managed the construction of a ~600 m thermal gradient well. Core was acquired and wireline surveys were run to fully characterize the target formations. Upon completion of drilling, JRG Energy provided specialist consulting services to Bluefit for the Brighton Hot Springs and Wellness Centre project that helped determine the technical and commercial viability of either deep coaxial close-loop, shallow close-loop or shallow open-loop geothermal as a key component of the heating / mineral water supply of the proposed hot springs development in Brighton, VIC.


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Technical Due Diligence

New Zealand

Obayashi Corporation enlisted JRG Energy to conduct a technical due diligence for Eastland Generation, specifically concentrating on subsurface elements of the assets. This diligence played a pivotal role in Obayashi Corporation's ultimate decision to acquire a 50% stake in Eastland Generation successfully. The examination provided crucial information regarding the current resources available for power generation, alignment with the existing owner's business plan, potential additional capital expenditures needed to realize the business goals, and identified uncertainties and risks associated with the geothermal resource. Furthermore, it outlined strategies to mitigate these uncertainties and risks.


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Geothermal Potential Screening and Opportunities Study


 JRG Energy provided a high-level geothermal potential screening study focused on geothermal opportunities in the Unites States of America. The key goals and objectives of this study were:
-   Understanding the geothermal potential for power production across existing and new concessions in continental US (i.e., excluding Hawaii and Alaska),
-   Identifying potential partners established in the US,
-   Understanding the regulatory framework (e.g., permitting process, subsides, incentives, etc.) for geothermal development in the US.



Olkaria Well Testing


JRG Energy offers specialist consulting services to Fortescue Future Industries (FFI) for third party well test confirmation and data management  in Kenya. This includes various activities, such as validating datasets, quality control, analyzing the flow rate and enthalpy calculations, output estimations, managing a data room with the inclusion of comments/notes to assist future reviewers, and performing on-site review/audit of well testing activity, reporting any risks or areas of concern to the client.



Geothermal Well Maintenance & Capacity Building

Montserrat, Caribbean

JRG Energy has been contracted by the Government of Montserrat (GoM) for maintaining the integrity of the wellhead equipment on 3 geothermal wells.  JRG Energy sent a Well Services Engineer to Montserrat to perform an initial inspection of the wellheads and all flow test equipment and ancillary tools. Following this, a maintenance plan has been developed by JRG Energy and the team will send two Well Services Engineers to Montserrat to carry out the works to achieve well flow for two of the wells while building the technical capacity of the local operators.


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Geothermal Market Feasibility Report for Sedimentary Basins

North America - Japan

JRG Energy conducted a Market & Desktop Pre-Feasibility Study for a major Japanese conglomerate providing a comprehensive review of Geothermal power generation using hot sedimentary reservoirs throughout North America (focus on US, Canada). The report provided clarity on the potential of this emerging market for geothermal development focusing on the technological and economic analysis to explore the re-purposing of O&G wells as well as drilling new wells in sedimentary basins.  


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Scale Removal and Production Enhancement


 JRG Energy worked with Philippines Geothermal Production Company (PGPC) to manage a slickline well intervention campaign for five major production wells aimed at increasing production. The project consisted of pre-job planning and engineering, procurement of specialized tools, site supervision, training, and reporting. The results produced over 8 additional MW across the two wells with more planned in 2023.


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World Bank Regulatory Study


JRG Energy led a multi-disciplinary consultancy team conducting an international review of geothermal electricity generation and direct use regulations for the World Bank and the Ministry of Energy of Chile. Technical specifications will be used to inform the Government of Chile’s drafting of a geothermal shallow direct use registry as well as safety and sustainability regulations for proposed regulatory amendments to the geothermal law.


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Geology Consulting / On Job Training on Geological Data Collection

Uganda & Tanzania

JRG Energy provided geological consulting services for two UNEP ARGeo projects in Uganda and Tanzania. One of three outside experts providing technical advice for the exploration of geothermal prospects near Kibiro, Uganda, and Ngozi, Tanzania. Responsibilities include: a review of all geological data, hands-on training of local personnel on geological data collection and interpretation to geologists at DGSM and TDGC, and development of integrated conceptual models to identify target sites for possible exploration wells


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Instructional Course


JRG Energy was contracted to teach a slickline/wireline course for geothermal well testing. The course consisted of equal amounts of classroom theory and site demonstrations to teach scale removal, fishing and safety procedures.



Direct-use Feasibility Study

New Zealand

JRG Energy performed a desktop study for a dairy client to asses the feasibility of utilizing existing geothermal assets for their dairy pasteurization process. The study included technical review, engineering practicality and previous case studies to create multiple business cases for the client to consider.


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Mineral Extraction Plant Study


JRG Energy performed a Silica extraction and mineral plant study and business plan at Cerro Prieto, Mexico. JRG performed geochemical analysis combined with an engineering feasibility overview for 1/2 a year.  The results were used to create a business case for the client.

Q1 2019

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Well Stimulation and Perforation

New Zealand

JRG Energy was the site manager/supervisor for all 3rd party contractors used to perform a multi-stage well stimulation (frac) on a large production field. The project included supervising main industry contractors (Halliburton, SGS, Schlumberger) to optimise the efficiency of the operation and ensure everyone complied with technical procedures, HSE, protocol, and environmental regulations.


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General Well Services

New Zealand

JRG Energy lead operations for Implementation testing and data acquisition essential to the development and implementation of a reservoir management strategy for geothermal fields operated by power generation companies in New Zealand.


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Feasibility Study


JRG Energy assisted Rockwater with the preparation of a Feasibility study for the integration of geothermal heat to a large-scale industrial application in the Parisian Basin. The project included destocking of legacy seismic data and reprocessing of 2D seismic lines. The data was used to assess the viability of the geothermal project and used as input for quick-look reservoir modelling and geochemistry modelling to support the conclusions of the Feasibility Study.   



Broaching campaign at Mak-Ban and Tiwi


JRG Energy mobilized in very short noticed equipment and personnel to undertake a very challenging broaching campaign. During this work scope there were a number of wells completely plugged off demanding a more heavy duty solution with CT/Rig milling activities as there was in some cases no hole to start with further reminding the client of the importance of early and frequent broaching intervention with rapid scale development. On other wells JRG proved that the entire well could be reached to TD with full well bore ID and with another well JRG were able to clear sufficient scale to allow the well to be brought back online for the first time in 12 years. On the remainder of the wells interviewed, six in total, good broaching progress was made to either deepen the HUD or increase OD at problematic areas of the well.


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Site evaluation, subsurface hydrogeology


The focus of this report was to summarize the site’s suitability for geothermal systems, provide analysis of the subsurface hydrogeology and geothermal characteristics, and assess the options that are available to the client at this stage, for the potential development of a WavePark. JRG Energy provided the Client advice regarding the options they have surrounding the heating aspects of their development.


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3D MT/Gravity Inversion and Interpretation

Alaska, USA

IGNIS Energy contracted JRG Energy to generate a combined MT/gravity 3D inversion model to identify/interpret subsurface geothermal elements in Alaska. To fulfil this scope JRG Energy worked through Modelling and Inversion, and Geophysical Interpretation.


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High Enthalpy Geothermal Well Testing Workshop


Due to JRG Energy’s position in the market as a trusted provider of quality geothermal well services, we were recently invited by a major O&G service contractor to develop and administer a workshop on high enthalpy geothermal well testing. During this workshop JRG had many deep and interesting conversations with many of the companies O&G energy experts helping to support the company and its people with capacity building in the area of high enthalpy geothermal well testing and thus support their strategic objectives to develop technology and services for the geothermal energy sector.


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IRENA Geothermal Technology Report


JRG Energy, through it's contractor Witteveen & Bos, produced a study for IRENA analyzing the geothermal market, geothermal technology development in recent years and assessing the current status of geothermal energy within the global energy market.

As part of this work, JRG Energy personnel also undertook:

  • A comprehensive literature review to identify the status, trends and perspectives for the geothermal industry in the context of energy transition, at both regional and national scales,

  • The development of a consultation meeting with key stakeholders, in coordination with IRENA and IGA,

The preparation of a high-quality report highlighting the findings of the consultation meeting, the interviews undertaken with the key stakeholders, and the literature review.


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High-Temperature Packer for Geothermal Wells


JRG Energy provided high temperature equipment procurement, engineering services and operational support to assist with the first deployment of a high-temp packer for geothermal well isolation. JRG managed pre-job and on-site engineering services, working with manufacturers designing the equipment to withstand the harsh geothermal environment, while providing expert engineering and project management services for the success of the project.


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Coil Tubing Scale Removal


JRG Energy worked with the local Philippines geothermal company, Energy Development Corporation (EDC) to manage a coil tubing well intervention campaign for 2 x major production wells. The project consisted of pre-job planning and engineering, procurement of specialized tools, site supervision, training, and reporting. The results produced over 7 additional MW across the two wells.


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Technical Support for Preparation of the Geothermal Risk Mitigation Facility Round 6

Djibouti & Tanzania

Through the New Zealand Ministry of Foreign Affairs & Trade (MFAT), JRG provided technical advice and support to two East African partner organizations in Djibouti and Tanzania in preparing funding applications for surface studies and drilling programmes from the 6th round of the GRMF. Support was for ODDEG’s North Ghoubbet, Djibouti surface studies, and the drilling programme for TGDC in Songwe, Tanzania, and Northwest Asal, Djibouti.


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Coil Tubing Scale Removal


JRG Energy successfully launched an innovative Coil Tubing-Scale Removal campaign in the Philippines. This included sourcing equipment, designing specialized equipment, managing logistics/customs, implementation and engineering, commissioning equipment, managing multiple international sub-contractors, COVID-19 quarantines, and more to achieve results. Highlights on the first well include milling with an industry first all metal-motor in +250 degC environment with an average ROP of 37m/hr, utilizing high-temp air hammers with customized bits, and engineering equipment modifications to improve the efficiency of subsequent campaigns.  



Technical Risk Review


JRG Energy formed a multi-disciplinary team of specialized geothermal experts to perform a due diligence, gap analysis and technical risk assessment for MIGA (insurance arm of the World Bank) regarding the Tulu Moye Geothermal Project in Ethiopia. The team analysed all reports and data provided for the client to generate two technical risk reviews and reported findings.



Wireline Fishing


JRG Energy was contracted to fish tools lost in a large geothermal production well. The work was performed in collaboration with the GREG team of EDC to remove tools successfully using slickline techniques.

Q1 2019

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Geothermal Slim Well Testing


JRG Energy designed, performed and analysed the first-ever geothermal well tests and geological, resource analysis of two slim-production wells in southern Armenia.  JRG Energy provided a geothermal team responsible for all aspects of the well testing, including planning, procurement, site operations, analysis, modeling, and analytical reporting for 1 year.

Q1 2019

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Well Test & Intervention Training


JRG Energy trained EDC geothermal operations personnel on geothermal well testing, well intervention, PTS data quality assurance, tracer flow testing, and design and installation of chemical inhibition system.


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Reservoir Modelling


JRG Energy developed a semi-regional reservoir model to evaluate the viability of future wells and assist with existing geothermal assets management. The main tasks included:
- Developing geological model using Leapfrog, based on existing model in Petrel,
- Reviewing available geoscience data and production records,
- Developing reservoir model using Waiwera including over 40 years of historical production / injection data,
- Running predictive simulations to evaluate the viability and performance of future geothermal wells.


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Pre-Feasibility and Business Case for Hydrogen Development


The pre-feasibility study focuses on the technical and commercial practicality of utilizing existing hydrocarbon assets for hydrogen production and on the adoption of existing hydrocarbon assets to hydrogen energy utilization. Existing asset data are analysed and combined with realistic business scenarios. The final deliverable creates a comprehensive business analysis on the feasibility of profiting from the utilization of grey/blue/green hydrogen in existing assets.



Caribbean FRENZ


JRG Energy is assisting with the delivery of the New Zealand’s Ministry of Foreign Affairs and Trade (MFAT) support programme for Caribbean stakeholders in the area of renewable energy (particularly, geothermal energy). The C-FRENZ facility promotes and leverages Aotearoa New Zealand’s own experience in renewable and geothermal energy, with JRG Energy performing the role of Delivery Manager and Geothermal Technical Experts. The Facility responds to local needs and priorities, providing technical services, capability building, capacity supplementation, and facilitating progress on renewable energy projects through building relationships with and support from other partners. Target countries include Dominica, St Lucia, St Vincent, Grenada, Belize, Guyana and Jamaica along with regional organisations such as the OECS, CDB and CCREEE.



Geothermal Potential Desktop Study


JRG Energy provided Fortescue Future Industries (FFI)  a Geothermal Desktop Study that helped FFI determine the technical and commercial viability of geothermal power generation in northeast Gabon. This included data collection, review of geoscientific reports and data, gap analysis, conceptual model development and resource assessment.


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Geothermal Wireline and Well Testing

Dominica, Caribbean

JRG Energy are providing wireline personnel to enable IDC to perform wireline logging and well testing of the proposed drilling program. This involves procurement of equipment, operating and helping maintain the equipment, collecting downhole PTS data, managing and performing the well test as per the program, analysis of the reservoir and geochemcial data, and reporting all data in a professional manner.


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Geothermal Ground Source Heat-Pump Feasibility Study

London, UK

JRG Energy worked with a large property developer in the process of developing a new major office building in the centre of London. The Client was interested in exploring various low-carbon technologies for providing the building’s heating and cooling demands and specified that they are interested in investigating the feasibility of Ground Source Heat Pump (GSHP) systems. JRG Energy carried out a geothermal resource assessment to determine the characteristics of the subsurface geology and hydrogeology at the site location. Each aspect was assessed, and GSHP system options generated, taking the specific requirements of the Client and the site into account. From the information gathered, it was possible for JRG Energy determine that the characteristics provided a suitable setting for numerous GSHP system options and present the client with recommendations for next steps in the project.


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Wireline and Well Testing


JRG Energy are providing wireline personnel and equipment to enable Mariott Drilling to perform geothermal logging and well testing of the proposed drilling program at Tulu Moye and Corbetti fields. This involves procuring, operating and helping maintain the equipment, collecting downhole PTS data, analyzing datasets, writing technical programs, managing and performing the well test, and reporting all data in a professional manner to the client.


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Technical Assistance


Through the New Zealand Ministry of Foreign Affairs & Trade (MFAT), JRG is providing managerial and technical capacity building to strengthen GDC’s ability to prepare for its operational management role at the Menengai Geothermal Field, Kenya. This will include supporting GDC to develop its operational management framework, technical competencies, systems, standards and procedures, and the institutional and human capacity that will be needed to efficiently manage the Menengai Geothermal Field (ongoing).


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Direct Use & Geochemistry Consulting


Geochemistry Consulting in Paris.  JRG Energy consulted on a project in Paris where we reviewed geochemistry and mineralogy data of target reservoirs, likely reactions for higher injection temps based on returns, and provision of lab testing workflow to verify results.



Well Testing

St Vincent, Caribbean

Performed geothermal well testing and wireline surveys on 3 geothermal exploration wells in St Vincent, Caribbean. JRG managed all site tasks including procurement of wireline equipment and operating equipment on-site for surveys/well tests.



Well Testing & Procurement


JRG Energy assisted the lead technical adviser to Electric de Djibouti (backed by the World Bank) to drill, test and eventually produce the Fiale geothermal resource in Djibouti. JRG Energy is assisting the client by providing well test equipment, performing the well’s geothermal wireline surveys and well testing.


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Asset Inspection

New Zealand

JRG Energy's sister company, Aerosphere Inspection, was contracted to perform an asset inspection and 3D model creation of an off-shore oil production platform.  The team used UAVs with various cameras and sensors to collect data from the structure to generate a risk/inspection report. The images were also combined to create a comprehensive 3D model which was used in a virtual reality VR/AR platform.

Q1 2019

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Geothermal Well Enhancement


JRG Energy worked as part of a team that introduced and executed a reservoir enhancement technique regarding calcite and silica removal using slickline broaching and acidizing with capillary tubing.  The project was done in partnership with SGS Philippines and Australasia.  JRG Energy has been engaged in this project for over 2 years and is still ongoing.

Q1 2019


Capillary Tubing Installation


JRG Energy designed and installed a capillary tubing system for geothermal production wells at Cerro Prieto. The system was installed, tested and replicated in 19 different wells across the field to mitigate silica scaling and corrosion due to acidic wells.


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