爪哇西北部海域Brani井的防垢挤阻措施

Hendro Vico, Riezal Arieffiandhany, I. Sanjaya, Lambertus Francisco, Yasinta Dewi Setiawati, B. R. Wijaya, Agung Arief Wijaya, Andhika Pratama, Arifin Isawiseman, E. Wijaya
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引用次数: 0

摘要

brani油田位于爪哇西北部海域,目前从砂岩油藏中开采油气,平均含水率为83%。一些高含水井容易结垢,需要反复洗井来克服产量下降的问题。2019年,对这些井的井下阻垢剂进行了评估和规划。阻垢剂能够防止结垢的形成,因此能够以更低的干预成本获得更高的平均产油量。在Brani井中,根据水成分、温度和溶解二氧化碳分压的降低,在射孔、井下完井设备和流线中形成结垢沉积物。这些结垢沉积物限制了流体的流动,造成了严重的生产损失。在极端条件下,生产油管会被结垢沉积物完全堵塞并停止生产。通常情况下,Brani井的防垢问题是通过机械和连续油管(CT)井下完井和酸化处理相结合的方式来解决的。根据井况,每隔2-4个月进行一次此类处理,在含水较高的井中,结垢会变得更加严重。从经济角度来看,由于昂贵的升降船和连续油管每天的费用,目前的水垢处理方法导致了非常高的油井干预成本。由于年平均产油量较低,这些常规处理方法的经济性进一步受到阻碍。缓蚀剂的评估从候选选择、流体相容性测试、岩心重新获得渗透率测试和经济评估开始。BRG-10井因结垢问题严重、产量低而被选为第一候选井。这口井在含水90%的情况下,通常产量为140桶/天,但油管和管线的结垢阻碍了流体的流动,在短短两个月内将产量降至30桶/天。实验室测试结果表明,岩心渗透率恢复到77.96%的较高水平,没有出现任何流体相容性问题。2020年1月,BRG-10井实施了阻垢剂挤压处理,将657桶阻垢剂注入地层。随后,该井被关井浸泡24小时。处理后的结果显示,经过11个月的处理,石油产量非常稳定,2020年12月的试井显示,该井的产量仍为130桶/天,含水率为90%。在BRG-10井成功应用后,BRK-7井于2020年6月应用,BRG-5L井于2020年8月应用。到目前为止,这两口井的产量表现良好,BRK-7为93桶/天,含水率为85%,BRG-5L为264桶/天,含水率为76%。
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Scale Squeeze Inhibitor as Preventive Treatment in Brani Wells, Offshore North West Java
The Brani-Field is located offshore Northwest Java and currently produces hydrocarbons from a sandstone reservoir with an average watercut of 83%. Some high watercut wells are prone to scale problems and need repetitive clean outs to overcome production decline. In 2019, downhole scale inhibitor treatment was evaluated and planned for application in these wells. Scale inhibitors are able to prevent the formation of scale so the well is able to deliver higher average oil production with lower intervention cost. In Brani wells, scale deposits are formed in perforations, downhole completion equipment, and flowlines depending on the water composition, temperature, and a reduction in dissolved carbon dioxide partial pressure. These scales deposits restrict the fluid flow causing significant production loss. In extreme conditions, the production tubing was blocked completely with the scale deposits and cease the production. Normally, the scale restriction problem in Brani wells were handled by a combination of mechanical and acidizing treatment using Coiled Tubing (CT) for downhole completion and acidizing treatment for flowline restrictions. These treatment were performed periodically every 2-4 months depending on well conditions with scaling becoming more severe in higher watercut wells. From an economic standpoint, current scale treatment methods lead to very high well intervention costs due to expensive liftboat and CT unit daily rates. The economics of these conventional treatments is further deterred by low yearly average oil production. Evaluation for scale inhibitor treatment started with the candidate selection, fluids compatibility test, core re-gain permeability test, and economic evaluation. BRG-10 well was selected as first candidate due to scale problem severity and low oil production rate. This well normally delivers 140 bopd with 90% watercut, but scale build up in the tubing and flowline prevented the fluids flow and lowered the production to 30 bopd in just two months. Laboratory test results demonstrated that the core regained permeability with the main pill fluids to a relatively high, 77.96% without any fluids compatibility issues. Deployment of a scale inhibitor squeeze treatment in BRG-10 well was executed in Jan 2020 by bullheading 657 bbl inhibitor fluids into the formation. The well was then shut in for 24 hours of soaking time. The post treatment results showed a very promising result with much more stable oil production after 11 months treatment, welltest on December 2020 showed the well was still producing 130 bopd with 90% watercut. Following the successful application in BRG-10, the scale inhibitor treatment was applied in other wells, BRK-7 in June 2020 and BRG-5L in August 2020. So far, those two wells show good production performance with 93 bopd with 85% watercut for BRK-7 and 264 bopd with 76% for BRG-5L.
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