Openhole Cleanup of Deep, High-Temperature Horizontal Wells With aChelant-Based Acid System—Case Histories From Indonesia

Openhole Clean-Up of Deep, High Temperature Horizontal Wells with a Chelant Based Acid System - Case Histories from Indonesia Kunto R. Wibisono; Kunto R. Wibisono ConocoPhillips Indonesia Inc. Search for other works by this author on: This Site Google Scholar Robert C. Burton; Robert C. Burton ConocoPhillips Search for other works by this author on: This Site Google Scholar Richard M. Hodge; Richard M. Hodge ConocoPhillips Search for other works by this author on: This Site Google Scholar Juanita M. Cassidy; Juanita M. Cassidy Halliburton Energy Services Group Search for other works by this author on: This Site Google Scholar Rio Wijaya; Rio Wijaya PT Halliburton Indonesia Search for other works by this author on: This Site Google Scholar Bastiaan Nieuwland Bastiaan Nieuwland Halliburton Energy Services Group Search for other works by this author on: This Site Google Scholar Paper presented at the International Oil & Gas Conference and Exhibition in China, Beijing, China, December 2006. Paper Number: SPE-104119-MS https://doi.org/10.2118/104119-MS Published: December 05 2006 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Wibisono, Kunto R., Burton, Robert C., Hodge, Richard M., Cassidy, Juanita M., Wijaya, Rio, and Bastiaan Nieuwland. "Openhole Clean-Up of Deep, High Temperature Horizontal Wells with a Chelant Based Acid System - Case Histories from Indonesia." Paper presented at the International Oil & Gas Conference and Exhibition in China, Beijing, China, December 2006. doi: https://doi.org/10.2118/104119-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Oil and Gas Conference and Exhibition in China Search Advanced Search AbstractConocoPhillips Indonesia Inc. Ltd. is producing oil and gas in various locations in Indonesia, both on and offshore. This paper covers work performed in the Belanak field offshore Indonesia. The field is located in Natuna Sea, north of Indonesia, near the border between Indonesia and Malaysia. The gas produced by the Belanak field is transported to Singapore and Malaysia.Belanak wells which are drilled in the Gabus Massive reservoir have a bottom hole static temperature of 315ºF (157ºC). The wells are typically long horizontals (2,300 - 3,400 ft) with openhole completions utilizing stand-alone screens through the producing interval. The reservoir section is drilled with a water-based Drill-in-Fluid (DIF) consisting of polymer and CaCO3 particles and displaced to a solids-free, DIF prior to running the screens.Typically, acid is used to degrade water-based DIF filtercake and remove CaCO3 contained in the filtercake. The use of a common acid was not an option for this development because of the high reservoir temperature (>300ºF). The combination of high reservoir temperature and long shut-in times after acid treatment lead to a high probability of severe corrosion of the sand control screens. In addition to the corrosion concerns with common acids, the rapid removal of the filtercake with acid could create localized, high leak-off of the treating fluid resulting in an uneven distribution of acid across the horizontal open-hole section.To overcome these problems, a slow reacting alternative chemical solution was required allowing the stimulation fluid to be placed across the entire horizontal open-hole section before the CaCO3 filter cake was dissolved and before major losses started to occur. The solution was found in the application of a Chelant Based Acid System.This paper details the application of the Chelant Based Acid System as a means to remove CaCO3 filter cakes in 10 Belanak wells, post treatment well performance, best practices, and lessons learned.IntroductionThe Belanak field is located offshore in the Indonesian waters of the West Natuna Sea, near the border between Indonesia and Malaysia (see Figure 1). The field is produced from two wellhead platforms with a total of 35 development wells which were drilled and completed over a 2-year period between 2003 and 2005. Hydrocarbons are produced from five different reservoir intervals: Arang, Gabus Massive, Gabus Zone-3, Lower Gabus and SB-90. The focus of this paper is on well completion and openhole cleanup work performed on a series of Gabus Massive horizontal wells.The Gabus Massive reservoir is comprised of a fairly homogeneous clear to white sandstone, generally medium to coarse grained although occasionally being fine grained. The sand is moderately well cemented, slightly calcareous and contains minor amounts of mica, kaolin and carbonaceous material9. The average reservoir data of the Gabus massive reservoir can be found in Table 1. Core porosity measurements show this sandstone to have good intergranular porosity. Porosity values range from 12% to 22%, with an average of 17%. The Gabus Massive has a high net-to-gross ratio and is easily correlated from well to well, indicating good reservoir continuity over the Belanak field. The thin interbedded shales found within the interval form only local or areally limited barriers to reservoir communication and the entire sand package is considered to be in fluid and pressure communication. This conclusion is also supported by pressure tests performed in exploration and appraisal wells drilled in the field. The Gabus Massive reservoir has a reservoir static temperature of 315ºF (157ºC) and an initial pressure of 3,400 psia at datum. Keywords: drilling fluid chemistry, drilling operation, drilling fluids and materials, drilling fluid selection and formulation, drilling fluid formulation, drilling fluid property, completion equipment, acid system, reservoir temperature, reaction Subjects: Drilling Operations, Drilling Fluids and Materials, Formation Evaluation & Management, Drilling fluid selection and formulation (chemistry, properties), Completion Selection and Design, Completion equipment This content is only available via PDF. 2006. Society of Petroleum Engineers You can access this article if you purchase or spend a download.

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