Subsea Development of Shallow, Low-Pressure Gas Reservoirs Using High Performance Well Designs

Subsea Development of Shallow, Low-Pressure Gas Reservoirs Using High Performance Well Designs R.C. Burton; R.C. Burton Conoco Inc. Search for other works by this author on: This Site Google Scholar E.R. Davis; E.R. Davis Conoco Inc. Search for other works by this author on: This Site Google Scholar R.M. Hodge; R.M. Hodge Conoco Inc. Search for other works by this author on: This Site Google Scholar T. Gilbert; T. Gilbert Conoco Inc. Search for other works by this author on: This Site Google Scholar R. Stomp; R. Stomp Conoco Inc. Search for other works by this author on: This Site Google Scholar N. Abdelmalek; N. Abdelmalek Conoco Inc. Search for other works by this author on: This Site Google Scholar M. Bailey M. Bailey Schlumberger Search for other works by this author on: This Site Google Scholar Paper presented at the SPE International Petroleum Conference and Exhibition in Mexico, Villahermosa, Mexico, February 2002. Paper Number: SPE-74365-MS https://doi.org/10.2118/74365-MS Published: February 10 2002 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Burton, R.C., Davis, E.R., Hodge, R.M., Gilbert, T., Stomp, R., Abdelmalek, N., and M. Bailey. "Subsea Development of Shallow, Low-Pressure Gas Reservoirs Using High Performance Well Designs." Paper presented at the SPE International Petroleum Conference and Exhibition in Mexico, Villahermosa, Mexico, February 2002. doi: https://doi.org/10.2118/74365-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Oil Conference and Exhibition in Mexico Search Advanced Search AbstractIn the summer of 2000, Conoco began a program to develop a series of shallow, low-pressure gas reservoirs in the Indonesian waters of the West Natuna Sea. The project consists of a series of subsea wells linked by pipeline to a central mobile gas processing and compression unit which feeds a sales line to Singapore. Overall project life is 20 years and will require development of 8 small fields with reserves of the order of 1 TSCF gas.Initial project planning used conventional well designs to deliver rates of the order of 20 MMSCFD/well from a number of gas reservoirs. This type of well productivity required 10 wells to meet Conoco Indonesia's maximum contract supply rate with several wells allocated to each reservoir. To improve project economics, a reduced well count employing high performance completion designs was developed. The high performance completions were designed to provide flow rates of the order of 100 MMSCFD at initial reservoir pressures ranging from 1250 psi to 1900 psi. These flow rates allowed well counts to be reduced to one well per reservoir.This paper will review Conoco's methodology for design and implementation of the first 4 high performance completions in the West Natuna Sea Gas Project. Well deliverability and initial project results will be discussed.IntroductionConoco, through its Indonesian subsidiary Conoco Indonesia Inc. (CII), has explored the Indonesian waters of the West Natuna Sea for over 30 years. As shown in Figure-1, Conoco's West Natuna Sea Production Sharing Contract (PSC) Area is located approximately 200 miles north/northeast of Singapore near the Indonesian/Malaysian border. During its period of operation the Company has discovered and developed several significant oil fields in the Block-B Production Sharing Contract Area as shown in Figure-2. The Company has also discovered a number of gas fields in the Block-B PSC Area, however, the lack of a local gas market and gas pipeline system has prevented effective development of these fields. Similarly, associated gas produced with oilfield crude has not been economically transported and sold and as a result produced gas volumes in excess of fuel requirements have been flared. As shown in Figure-3, Conoco's gas discoveries and associated gas resources in Block-B have been effectively stranded by lack of a gas pipeline system and local gas market. Adjacent PSC operators have also experienced these types of problems and have suffered significant stranded gas volumes.In the late-1990s Conoco worked with the Indonesian State Oil Company, Pertamina, and adjacent PSC operators Gulf Canada and Premier Oil to establish a 20-year gas supply contract with Singapore and a gas pipeline from the Indonesian West Natuna Sea to Singapore. An overview of the pipeline system and the various PSC areas is shown in Figure-4. Under the terms of the gas supply contract, the three PSC operators agreed to supply approximately 2.5 TSCF of gas at an average rate of 325 MMSCFD for a long-term electrical power generation project. Each operator is responsible for developing gas fields or associated gas in its own PSC area to meet its share of the total production requirement. Each operator's gas is then metered and flowed to the jointly owned and operated West Natuna Gas Transportation System for transport to Singapore and sale to the purchaser. Keywords: deliverability, wn gas project, conoco, spe 74365, completion installation and operations, upstream oil & gas, well design, gas field, subsea development, permeability Subjects: Drilling Operations, Formation Evaluation & Management, Perforating, Completion Installation and Operations, Sand Control, Completion Operations This content is only available via PDF. 2002. Society of Petroleum Engineers You can access this article if you purchase or spend a download.

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