<h1>Heera &amp; Neelam Oil and Gas Project (Mumbai,India)</h1>

<p>The Heera &amp; Neelam Oil and Gas Project is an operating offshore oil and gas project in India,operated by Oil and Natural Gas Corporation in the Mumbai Offshore Basin. The project is a conventional upstream asset located offshore Mumbai and is fully owned by Oil and Natural Gas Corporation Ltd. Heera &amp; Neelam is an active producing asset,with separate field histories,water-injection infrastructure and redevelopment activity.</p>

<p>The project is part of India’s western offshore producing system,which includes Mumbai High,Neelam and Heera,and Bassein and Satellite. The Heera field was discovered in 1977 and put on production in 1984,while Neelam started production in 1989 and entered full-fledged development from 1993 to 1994.</p>

<h2>Quick Facts</h2>
<table>
<tbody>
<tr><th>Item</th><th>Detail</th></tr>
<tr><td>Project Name</td><td>Heera &amp; Neelam Oil and Gas Project</td></tr>
<tr><td>Country</td><td>India</td></tr>
<tr><td>Subnational Unit</td><td>Mumbai</td></tr>
<tr><td>Fuel Type</td><td>Oil and gas</td></tr>
<tr><td>Production Type</td><td>Conventional</td></tr>
<tr><td>Status</td><td>Operating</td></tr>
<tr><td>Operator</td><td>Oil and Natural Gas Corporation</td></tr>
<tr><td>Owner(s)</td><td>Oil and Natural Gas Corporation Ltd 100%</td></tr>
<tr><td>Parent Company</td><td>Oil and Natural Gas Corporation Ltd 100%</td></tr>
<tr><td>Onshore/Offshore</td><td>Offshore</td></tr>
<tr><td>Discovery Year</td><td>1977</td></tr>
</tbody>
</table>

<h2>Location and Basin</h2>
<p>The project is located offshore Mumbai,India,in the Mumbai Offshore Basin,a major hydrocarbon province on India’s western continental margin. The Directorate General of Hydrocarbons describes the Mumbai Offshore Basin as a pericratonic rift basin on the western continental margin,continuing toward the onland Cambay Basin to the north-northeast. Commercial production began in shallow water in 1976. Major producing fields include Mumbai High,Heera and South Heera,Bassein and SB-11,and Neelam.</p>
<p>The basin occupies about 212,000 square kilometres and has been appraised to the extent of 100%. The shallow-water area has 26 fields with 1,747 producing wells. Geologically,the basin has supported multiple major discoveries including Mumbai High,Heera,Panna,Bassein,Neelam,Mukta,Ratna,South Tapti and Mid Tapti.</p>

<h2>Ownership and Operatorship</h2>
<p>Oil and Natural Gas Corporation operates the project and is the 100% owner. ONGC is India’s principal national upstream oil and gas company and has long operated the country’s largest offshore producing assets. The ownership structure is straightforward compared with production sharing contract or joint venture assets. The field is associated with ONGC’s nomination-era offshore acreage and is part of its legacy western offshore operating base. ONGC is responsible for redevelopment,recovery enhancement,offshore production operations,well delivery,pipeline management,platform integrity and production optimisation across its western offshore assets. Public sources confirm redevelopment activity in Heera and Neelam,including Heera redevelopment phases and the Neelam redevelopment scheme.</p>

<h2>Development History</h2>
<table>
<tbody>
<tr><th>Milestone</th><th>Year</th><th>Details</th></tr>
<tr><td>Discovery</td><td>1977</td><td>Heera field discovered in September 1977.</td></tr>
<tr><td>Production start</td><td>1984–1994</td><td>Heera production began November 1984; Neelam production started 1989,full-fledged development 1993–1994.</td></tr>
<tr><td>Recent status</td><td>2025</td><td>Project remains operating; recent public references to western offshore pipeline replacement and Heera-Neelam gas integration activity.</td></tr>
</tbody>
</table>
<p>The modern development history begins with the Heera discovery in September 1977. Heera entered production in November 1984 and initially produced under depletion drive for about six years. Water injection started in September 1990 to support pressure maintenance and recovery. Neelam started in 1989 and entered full-fledged development from 1993 to 1994,with water injection beginning in 1994. The field later underwent an improved oil recovery programme in 2001–2002,completed by 2005–2006.</p>
<p>Redevelopment has been a recurring feature. Heera field underwent two rounds of development during 2001–2005. Heera redevelopment schemes Phase I and II were taken up from 2006 and 2012; Phase III was approved in May 2019 and was under execution at the time of the CAG report. Neelam redevelopment scheme launched in 2015 was also reported in progress.</p>
<p>Recent development activity includes production optimisation and infrastructure integrity work. In December 2023,ONGC inaugurated the Heera Neelam Gas Integration Project,described as enhancing free gas from the Heera field. In March 2026,Lamprell was appointed for ONGC’s PRP-IX pipeline replacement project,covering approximately 285 kilometres of subsea pipelines across Mumbai High,Neelam and Heera,Bassein and Satellite fields,with associated topside modification work.</p>

<h2>Infrastructure and Facilities</h2>
<p>Verified infrastructure includes offshore platforms,wells,pipelines,water injection infrastructure and production support systems. The CAG report on water injection states that the western offshore system included seven water injection platforms,of which two were in the Neelam-Heera fields,with associated wells,pipelines,injection processing equipment,water injection lines and metering systems. Treated water was injected through 30 wellhead platforms and 80 injection strings in the Neelam and Heera fields. Two water injection platforms,73 wells and 33 pipelines are associated with water injection infrastructure for these fields.</p>
<p>Water injection supports pressure maintenance and sweep efficiency in mature oil reservoirs. Heera initially produced under depletion drive; water injection and later redevelopment schemes formed part of ONGC’s recovery management strategy. Recent pipeline infrastructure work includes the PRP-IX project,covering replacement of approximately 285 kilometres of subsea pipelines across ONGC’s western offshore fields,including Neelam and Heera,with topside modifications. Public sources do not confirm FPSOs,LNG trains or subsea production systems for the project.</p>

<h2>Production and Reserves</h2>
<p>Global Energy Monitor reports initial oil in place of 3,034.62 million barrels for the project,with a 2010 data year. Cumulative oil production is reported at 901.59 million barrels by 2024,with annual oil production of 20.34 million barrels in 2015 and 17.74 million barrels in 2017.</p>
<p>DGH’s Hydrocarbon Outlook 2024–2025 lists cumulative production for Heera &amp; South Heera at 80 million metric tonnes of oil and 23 billion cubic metres of gas,and Neelam at 39 million metric tonnes of oil and 16 billion cubic metres of gas. These are field-group figures for the Mumbai Offshore shallow-water area. Current field-level daily production for Heera &amp; Neelam alone is not clearly confirmed in recent public sources. In 2023,The Economic Times reported that ONGC’s main western coast producing assets (Mumbai High,Neelam and Heera,and Bassein and Satellite) collectively produced about 41.5 million cubic metres per day of gas and 280,000 barrels per day of oil.</p>

<h2>Recent Developments</h2>
<p>Recent activity focuses on production optimisation and infrastructure renewal. In December 2023,ONGC inaugurated the Heera Neelam Gas Integration Project,intended to enhance free gas from the Heera field. In March 2026,Lamprell was appointed for ONGC’s Pipeline Replacement Project PRP-IX,covering approximately 285 kilometres of subsea pipeline replacement and laying across Mumbai High,Neelam and Heera,Bassein and Satellite fields,with topside modifications. Public sources do not confirm a recent new final investment decision specifically for the project. Activity is characterised as brownfield optimisation,gas integration,pipeline replacement and continuing redevelopment within ONGC’s mature western offshore operating base.</p>

<h2>Related Topics</h2>
<ul>
<li>ONGC western offshore assets</li>
<li>Mumbai Offshore Basin</li>
<li>Heera oil and gas field</li>
<li>Neelam oil and gas field</li>
<li>India offshore oil production</li>
<li>Water injection in mature oil fields</li>
<li>Improved oil recovery</li>
<li>Offshore pipeline replacement</li>
<li>Brownfield offshore redevelopment</li>
<li>Mature offshore field integrity</li>
<li>Arabian Sea oil and gas production</li>
<li>Indian domestic hydrocarbon production</li>
<li>DGH India Hydrocarbon Outlook</li>
<li>ONGC platform integrity</li>
<li>Gas flaring reduction and gas integration</li>
</ul>

<h2>Sources</h2>
<ul>
<li><a href="https://www.gem.wiki/Heera_%26_Neelam_Oil_and_Gas_Project_%28Mumbai%2C_India%29" rel="nofollow noopener" target="_blank">Global Energy Monitor: Heera &amp; Neelam Oil and Gas Project (Mumbai,India)</a></li>
<li><a href="https://www.gem.wiki/Neelam_Oil_and_Gas_Field_%28India%29" rel="nofollow noopener" target="_blank">Global Energy Monitor: Neelam Oil and Gas Field (India)</a></li>
<li><a href="https://dghindia.gov.in/assets/downloads/56cfd7ae55eb2Mumbai_Offshore_basin.pdf" rel="nofollow noopener" target="_blank">Directorate General of Hydrocarbons: Mumbai Offshore Basin</a></li>
<li><a href="https://www.dghindia.gov.in/assets/downloads/ar/2024-25/files/basic-html/page36.html" rel="nofollow noopener" target="_blank">Directorate General of Hydrocarbons: India’s Hydrocarbon Outlook 2024-2025,Mumbai Offshore Basin</a></li>
<li><a href="https://www.dghindia.gov.in/assets/downloads/ar/2023-24/" rel="nofollow noopener" target="_blank">Directorate General of Hydrocarbons: India’s Hydrocarbon Outlook Report 2023-2024</a></li>
<li><a href="https://cag.gov.in/uploads/download_audit_report/2021/Chapter%20I%20Intro-0623c3a870ac656.74312190.pdf" rel="nofollow noopener" target="_blank">Comptroller and Auditor General of India: Development of Mumbai High,Neelam and Heera Fields</a></li>
<li><a href="https://economictimes.indiatimes.com/markets/commodities/news/ongc-stepping-up-7-billion-drive-to-boost-output/articleshow/99239939.cms" rel="nofollow noopener" target="_blank">The Economic Times: ONGC Stepping Up Drive to Boost Output</a></li>
<li><a href="https://ocean-energyresources.com/2026/03/06/lamprell-appointed-for-ongcs-pipeline-replacement-project/" rel="nofollow noopener" target="_blank">Ocean Energy Resources: Lamprell Appointed for ONGC’s Pipeline Replacement Project</a></li>
<li><a href="https://www.psuconnect.in/psu-news/ongc-director-production-pankaj-kumar-inaugurates-heera-neelam-gas-integration-project" rel="nofollow noopener" target="_blank">PSU Connect: ONGC Heera Neelam Gas Integration Project</a></li>
<li><a href="https://cdm.unfccc.int/Projects/Validation/DB/UJK1KY6ZAW7K6UH5EI5O1MFTRIVLHA" rel="nofollow noopener" target="_blank">UNFCCC CDM: Gas Flaring Reduction Project at Neelam and Heera Asset</a></li>
</ul>

IEPTC reference profile for Heera & Neelam Oil and Gas in Mumbai,India,covering asset type,location,development status,and upstream industry context.

Heera & Neelam Oil and Gas Project (Mumbai,India)

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Heera & Neelam Oil and Gas Project (Mumbai,India)

Heera & Neelam Oil and Gas Project (Mumbai,India)

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