A study on synthetic relieving plug agent for steam huff-puff wells in the water-sensitive formation
Book
·
OSTI ID:113578
- Scientific Research Inst. of Petroleum Exploration and Development, Beijing (China)
A great quantity of heavy crude oil has been produced by using steam huff-puff method in the Liaohe Oil Field. This kind of crude contains a lot of resin-asphaltene and possesses the property of very high viscosity and specific gravity. The formation is not only very sensitive to water, but also is damaged by drilling muds. Through steam injection, the production rate was still very low and the duration of steam huff-puff was very short because of plugs which were formed by clay swelling and the residual hydrocarbon that was produced by volatilization of light fractions of heavy crude around the wellbore. This paper offers a synthetic relieving plug agent which is a mixed fluid, containing organic mixed solvent, inorganic acid, surfactant and other additives. The synthetic relieving plug agent (ARP-8801 and BJ-30) has been successfully used in 37 wells in Shuguang No. 48 Union, Liaohe Oil Field since April 1989. According to the statistical data obtained from 33 experimental wells, it has been shown that the ARP-8801 and BJ-30 synthetic relieving plug agent has excellent relieving plug ability for the heavy crude wells using steam huff-puff method in water-sensitive formations. The production rate per well was increased on an average from 0--8.6 tons/day (before treatment) to 6.0--26.7 tons/day (after treatment). The duration of steam huff-puff was increased on an average from 121 days (before treatment) to 218 days (after treatment). The oil/steam ratio increased from 0.41 (before treatment) to 1.17 (after treatment). The cumulative incremental oil production has reached 41,704 tons. The application in oil field proved that the method, offered by this paper, is a very nice stimulation treatment for heavy crude wells injecting steam in the water-sensitive formation. The mechanism of relieving plug is also discussed in this paper.
- OSTI ID:
- 113578
- Report Number(s):
- CONF-950207--
- Country of Publication:
- United States
- Language:
- English
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