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1、cyclic steam stimulation technology for heavy-oil reservoir
The basic principle of steam stimulation is to inject steam into the oil layer, heat the oil layer, reduce the viscosity of crude oil, and then extract it. The higher the dryness of the steam, the more energy it carries, and the steam injected into the oil layer near the well is easier to diffuse outward, expanding the scope of the steam zone and the steam condensation zone to heat the formation and crude oil.
Descriptions of process drawings：
In order to solve the problem of low recovery rate of heavy oil caused by reservoir heterogeneity, the steam injection well section is divided into several steam injection units by means of thermal recovery packer and steam injection valve, and multi-point steam injection is carried out to improve the utilization degree of reservoir.
In addition, for casing windowing, reperforating and sidetracking wells using small-size casing completion ( 139.7mm ), the selective steam injection technology of small-diameter casing is used to further reduce the implementation cost and increase the production of old wells.
3、Step-by-step Deep Sealing Water Control Technology For Heavy Oil Steam Injection Wells
Based on the distribution characteristics of reservoir steam injection temperature and pressure field, three systems are adopted to meet the sealing and channeling requirements of medium-low temperature far well zone, medium-high temperature transition zone and near-well high temperature zone. Its slug design is as follows :
| Sealing channeling level | Temperature / phase state | Systems | Photo | Performance characteristics / Applicable conditions |
| far well zone |
Initial formation temperature~100 ℃ （cold water） |
New double crosslinking gel |  |
Suitable temperature 50 ~ 100 °C High gel strength ( above G level ) |
| transition zone |
100℃~150 ℃ （hot water） |
HT retarded gel |  |
Suitable temperature 90 ~ 150 °C High gel strength ( above G level )） |
| near-well zone |
150℃~250 ℃ （hot water ~ steam） |
HT nitrogen foam |  |
The temperature resistance is above 250 °C. Selective plugging, no pollution |
