| Autor: |
Xinwu Liao, Chao Liu, Tingli Li, Rong Fu, Jianjun Zheng, Ming-Ming Chang, Xvwei Bie, Chunrong Mu, Rensen Qin, Yunlai Zhang |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
All Days. |
| Popis: |
Chemical injection has been used to combat reservoir sweeping and water-control problems in the last two decades with different degrees of success. Many of the methods face the challenges of chemical durability, penetration depth, rock-fluid compatibility, and economical justification. Polymer microsphere injection is a new method developed recently to address these challenges in controlling waterflood conformance to enhance recovery efficiency. Made by emulsion synthetic technique the polymer microsphere expands at contact with reservoir water resulting in plugging of high permeability pore throat deep into the formation to divert the water flow path. The laboratory experiments showed an improvement of recovery factor by 14 to 16%. This paper presents the first field test in an offshore environment of a heavy oil reservoir Q in Bohai Bay in China. Q oilfield is a heterogeneous heavy oil reservoir suffering from fast water breakthrough with poor recovery. The polymer microsphere was injected into an eleven-well pilot. The injection pressure increased following injection of microsphere solution. Multiple fall-off tests were performed to monitor the plugging of flow channels at different times. The time taken to reach the reservoir pressure in the fall-off test increased with flooding time for four months demonstrating an effective channel plugging. Most of surrounding producers showed responses to microsphere injection in both pressure and oil production. The incremental recovery benefit to the test cost is estimated to be 4:1 to 6:1. The encouraging pilot test demonstrated the potential of polymer microsphere flooding to combat reservoir conformance challenge. This test needed simple equipments which were easy to be operated in the offshore platform environment. Further polymer microsphere flooding tests are in plan in China Bohai Bay area. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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