Developing an extra-heavy oil reservoir with active edge and bottom water through steam injection and edge water drainage
The extra-heavy oil reservoir of Shu 175, located in Liaohe rift, is one of the three types of reservoirs in Liaohe oil province which were developed through steam injection. The steam injection pilot started in 1983. The viscosity of the oil in place is high , and the daily oil production by conventional means is lower than 0.2 t, which is of no commercial value, so the development method of steam injection was adopted. After 66 months of huff and puff, the total steam injection was 41.19 x 10{sup 4} t (water equivalent), the cumulative oil production was 54.7387 x 10{sup 4} t, the OSR at the huff and puff stage was up to 1.33, and the recovery percent was as much as 12.08%. Since edge and bottom water in the oil reservoir is strong, the pressure differential between center and edge gradually increased to over 5.0 MPa with development time; consequently, water production increases rapidly, with water cut rising from 40.0% to 56.4%. Huff and puff development results worsened significantly. Adjustments were conducted at the end of 1988. Steam flooding in the center and water drainage from edge were performed at the same time. By the end of December 1993, 11 wells had been converted to steam flooding with huff and puff still performed in some oil wells. In the steam flooding stage, the total steam injection was 147.7 x 10{sup 4} t, including initial injection by huff and puff, and the OSR was 0.387. Daily oil production increased from 278 t, the lowest of the conversion period, to 364 t and remained stable at more than 300 t/d to the present. The reservoir pressure in the center gradually restored from 4.5 MPa and remained stable at about 6.5 MPa. The pressure differential between the center and the edge was controlled below 3.0 MPa, the water cut was controlled below 75%, and the production-injection ratio reached more than 1.2.
- OSTI ID:
- 269574
- Report Number(s):
- CONF-9502114-Vol.1; TRN: 96:001163-0063
- Resource Relation:
- Conference: 6. UNITAR international conference on heavy crude and tar sands on fueling for a clean and safe environment, Houston, TX (United States), 12-17 Feb 1995; Other Information: PBD: [1995]; Related Information: Is Part Of Heavy crude and tar sands -- Fueling for a clean and safe environment. Proceedings: Volume 1; Meyer, R.F. [ed.]; PB: 811 p.
- Country of Publication:
- United States
- Language:
- English
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