Development of Low-Permeability Heavy Oil Reservoirs by CO2 + Surfactant Combination Huff and Puff : A Case Study of Upper Wuerhe Formation Reservoir in Southern Block 5, Karamay Oilfield

doi:10.7657/XJPG20220208

Abstract

Abstract:

The reservoir in the upper Wuerhe formation, southern Block 5, Karamay oilfield, is a heavy oil reservoir with low porosity and low permeability, indicating poor reservoir physical properties. When it was developed by water injection, the production decreased rapidly, and the formation energy kept low; as a result, all production wells were shut in or suspended. In recent years, some wells have been refractured to resume production and good effects have been gained in the initial stage, but the production declines rapidly. In order to solve the problems of low production and low efficiency of production wells, the CO₂ + surfactant combination huff and puff technology was developed and tested for production enhancement. On the basis of experiment on stimulation mechanism, through multi-component reservoir numerical simulation, the method and parameters for injecting CO₂ + surfactant were optimized. The relationship between the changes of the production increment and the parameters such as injection volume, injection rate, soaking period and production intensity in different cycles of huff and puff were established, and the optimal parameters for injecting CO₂ + surfactant were determined for huff and puff. Field application reveals a natural flow of a sing well for 240 days and an incremental oil production of 630 t. It is concluded that the CO₂ + surfactant combination huff and puff technology can effectively supplement formation energy and improve fluid mobility, which can be used as a reference for the development of similar reservoirs.

Key words: Karamay oilfield, upper Wuerhe formation, low-permeability heavy oil reservoir, CO₂, surfactant, composite huff and puff numerical simulation, recovery rate

CLC Number:

TE384

HUANG Weiqiang. Development of Low-Permeability Heavy Oil Reservoirs by CO₂ + Surfactant Combination Huff and Puff : A Case Study of Upper Wuerhe Formation Reservoir in Southern Block 5, Karamay Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(2): 183-187.

Figures/Tables 6

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Development of Low-Permeability Heavy Oil Reservoirs by CO₂ + Surfactant Combination Huff and Puff : A Case Study of Upper Wuerhe Formation Reservoir in Southern Block 5, Karamay Oilfield

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