Deep Downhole Chemical Injection on BP-Operated Miller: Experience and Learning
- Jonathan J. Wylde (Clariant Oil Services) | Gareth D.M. Williams (Clariant Oil Services) | Fleur Careil (BP plc) | Phil Webb (BP) | Alan Morris (EGIS)
- Document ID
- Society of Petroleum Engineers
- SPE Production & Operations
- Publication Date
- May 2006
- Document Type
- Journal Paper
- 188 - 193
- 2006. Society of Petroleum Engineers
- 4.3.4 Scale, 4.1.5 Processing Equipment, 4.2.3 Materials and Corrosion, 7.5.5 Communities of Practice, 4.3.1 Hydrates, 4.1.2 Separation and Treating, 5.6.4 Drillstem/Well Testing, 2.2.2 Perforating, 4.5.7 Controls and Umbilicals, 3 Production and Well Operations, 5.4.2 Gas Injection Methods, 4.2 Pipelines, Flowlines and Risers, 5.2 Reservoir Fluid Dynamics, 4.3.3 Aspaltenes
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The BP-operated Miller field poses a unique chemical challenge because it has arguably the harshest oilfield scaling regime in the North Sea, if not the world. An average of three to four squeeze treatments per week are performed across the online wells, creating tremendous operational, chemical, and logistical challenges. This produces the ideal environment in which to evaluate new technologies and engineering solutions in an attempt to increase the wells' overall efficiency.
Deep downhole chemical injection (DDHCI) was installed on Well A26/08 and brought on line in July 2003. The Miller DDHCI is unique to the industry because it allows the injection of a scale inhibitor at the perforations by means of a tail pipe, essentially protecting the whole of the tubing from scale deposition. This approach has the potential to reduce the need for additional scale control through squeeze treatments.
Much emphasis has been placed on the efficiency of scale protection that DDHCI offers. A year of flowing the well under the protection of the continuous-injection chemical has yielded much information about the nature of the chemical delivery and inhibitor efficiency. Much also has been learned about the pumping hardware required to ensure continued performance. Further information has been provided by two intensive sampling exercises that have allowed independent analysis of the squeeze chemicals and the injected chemical.
This paper details the design criteria of the DDHCI completion as well as the philosophy of installing such a device. It then gives details on the management strategy of using DDHCI in a proactive manner to maximize the time between squeeze treatments.
Miller Field Background
The BP-operated Miller field is located in the U.K. Sector of the North Sea in Blocks 16/7b and 16/8b, approximately 145 miles north/northeast of Aberdeen. The field produces both gas (exported down the Miller Gas Pipeline to Peterhead) and oil (exported through the Forties Pipeline System to Grangemouth). There are 10 producer wells; first oil occurred in 1992 and leveled off in 1993 at 140,000 BOPD. Water and gas injection was initially through six injector wells; it began approximately 1 year after first oil and peaked at 300,000 BWPD.
Steady decline has occurred since 1997 and was contemporaneous with high and sudden water breakthrough. Currently, the field potential is 16,000 BOPD, and water-production potential is 80,000 BWPD. In spite of this, the field has achieved its original recoverable reserves, having produced a little more than 340 million bbl of oil. Cessation of production (COP) is currently expected to be December 2006 on the basis of recent low-oil-throughput flow trials.
The most significant aspect of the Miller is the barium content of its formation water. This is summarized in Table 1, and it is the 650-ppm barium figure that stands out. This figure was determined from the initial preproduction samples; since then, a range of barium concentrations has been detected at surface, with a maximum being more than 3,500 ppm.
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Wylde, J.J., Williams, G.D.M., and Careil, F. 2005. Innovative, Integrated, and CostEffective Chemical Management on the Miller Platform. Paper SPE 92834presented at the SPE Middle East Oil and Gas Show and Conference, Bahrain,12-15 March.
Wylde, J.J., Williams, G.D.M., Careil, F., Webb, P., and Morris, A. 2005. A New Type of Super-Adsorption,High-Desorption Scale Squeeze Chemistry: Doubling Treatment Life on MillerWells. Paper SPE 92833 presented at the SPE International Symposium onOilfield Scale, Aberdeen, 11-12 May.