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• W2019480650 abstract "SUMMARY. A new degasser/desurger design has demonstrated superior gas separation characteristics compared with a conventionally designed flume separator in oilfield production battery service. These new degasser units have been in continuous sour service for 3 years in the Salt Creek field. They have efficiently removed gas from surging liquid volumes of up to 170,000 BFPD [27 030 m3/d fluid] and cost much less than conventionally designed two-phase separators. Introduction This degasser/desurger (gas boot) was designed and constructed in Aug. 1982 for use in the Salt Creek Light Oil Unit vortex production batteries. The Vortex Treating System is a specific-gravity oil/water separation system and requires complete removal of entrained gas and the liquid surges this free gas causes. The first such system was installed with a vertical flume-type separator but failed to produce acceptable results. Inefficient gas separation was evidenced by gas bubbles boiling out of the upper oil layer and contamination of the vessel's upper oil layer with water. Entrained gas and continual liquid surges prevented acceptable oil/water separation and led to the conclusion that a more efficient separator design was required. A brief search of the degasser market revealed that no commercially available degassers were lightweight, corrosion resistant, and inexpensive and had a high liquid capacity. A need for such a degasser/desurger led to this new design. The first unit installed was 6 ft [1.83 m] in diameter and 7 ft [2.13 m] tall and was designed for the expected liquid flow rate of 50.000 BFPD [7950 m3/d fluid] and 150 Mcf/D [4250 m3/d] gas. The degasser unit functioned very well and removed sufficient entrained gas and liquid surges to improve oil/water separation in the vortex vessel substantially. Success of this degasser/desurger design has also made the use of vortex vessels for primary oil/water separation successful in the Salt Creek field. Replacement and consolidation of conventionally designed gunbarrel production batteries into large vortex batteries were then production batteries into large vortex batteries were then possible, resulting in substantial operating cost savings possible, resulting in substantial operating cost savings and the capacity to process up to 170,000 BFPD [27 030 m3/d fluid] efficiently in a single production battery. Background In Aug. 1982, a new oil/water specific-gravity production vessel was installed in the Salt Creek Light Oil Unit. The Salt Creek field is located about 45 miles [72 km] north of Casper, WY, and has been under waterflood for more than 20 years. This new production separation vessel was a replacement of the 3,000-bbl [477-m3] gunbarrel that had reached its operating capacity of about 35,000 BFPD [5565 m3/d fluid]. Waterflood expansion at that time was expected to increase treating volumes to as high as 50,000 BFPD [7950 m3/d fluid]. The new system is called a Vortex Treating System and is a highly efficient yet simple replacement for conventional gunbarrels. Because it was the first such installation for primary production separation of oil and water and because measured production separation of oil and water and because measured vent-gas flow rates were very low, no problems with inlet gas separation were anticipated. A brief discussion of how produced fluid is piped to each production battery in the Salt Creek field may provide additional background to this gas separation provide additional background to this gas separation problem. This field is produced primarily by beam lift, problem. This field is produced primarily by beam lift, which results in surging flow. Each well is piped to local test-point manifolds for periodic automatic well testing. Considerable fluid surging is evident even here. This is the result not only of the beam pumping units' stroking but also of flowing gas bubbles' coalescing into larger gas bubbles. These larger gas volumes, along with the surging liquid, then proceed from these outlying test-point manifolds to the production battery inlet header. As these gas volumes approach the battery inlet header, they again coalesce with others. This phenomenon and the flowline pressure drop of up to 200 psi [1380 kPa] leave even larger pressure drop of up to 200 psi [1380 kPa] leave even larger gas volumes approaching the production battery inlet gas separator. It is this alternating gas/liquid flow that may produce instantaneous gas and liquid flow rates five times produce instantaneous gas and liquid flow rates five times their average daily rates. The Vortex Treating System's design requirements include complete separation of inlet gas from the liquid and removal of all liquid surges. Vent-gas volumes at this production facility were never expected to exceed 150 Mcf/D production facility were never expected to exceed 150 Mcf/D [4250 m3/d], even with an upcoming waterflood expansion. Because of these assessments, the new vortex system was installed with a flume-type vertical separator, as indicated in Fig. 1. This flume separator was constructed from 24-in. [61-cm] -OD pipe with alternating baffles sized to cover one-third of the pipe ID to give the inlet fluid sufficient agitation to allow disengagement of any gas. It was also expected that this agitation would remove liquid surging. SPEPE P. 51" @default.
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• W2019480650 date "1987-02-01" @default.
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• W2019480650 title "New Degasser/Desurger Design Solves Gas Separation Problems" @default.
• W2019480650 doi "https://doi.org/10.2118/14286-pa" @default.
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