Improved DTS profiling model for horizontal gas wells completed with the open-hole multi-stage fracturing system
Section snippets
Credited author statement
Weibo Sui: Model establishment and paper writing. Di Zhang: Model programming. Si Cheng: Formal analysis. Qilin Zou: Field data collection. Xiaosong Fu: Formal analysis. Zehao Ma: Validation
Mathematical model description
Fig. 1 shows the completion diagram of a horizontal multi-stage fractured well with openhole packer completion. The formation fluids firsly enter the annular space from hydraulic fractures, then the fluids flow into production pipe when arriving at the frac ports. The fluid temperature in the production pipe is monitored by a coiled tubing conveyed DTS equipment. To simulate the temperature monitored by DTS and inverse gas flow profile, the following mathematical models were established. The
Synthetic cases
With the presented mathematical model, the temperature behavior of a horizontal multi-stage fractured well with openhole packer completion was studied, and the effects of gas rate and frac port location were investigated by using synthetic cases. Through the following cases, the reservoir and fluid properties are all kept the same. The horizontal well is isolated to be four stages for illustration, and there is single transverse fracture whithin each stage. The fracture lengths of different
Field application
By adding a sub-region of annular space, the improved model could be used to simulate the flow and heat transfer more accurately for a horizontal multi-stage fractured well with openhole packer completion. Here we apply the presented model to interpret the temperature data monitored by DTS during a post-fracturing production test for gas rate profiling.
The horizontal well was producing gas from a tight sandstone reservoir in the Erdos Basin, China. With the openhole packer completion, the well
Conclusion
We have presented a temperature prediction model for a horizontal multi-stage fractured well with openhole packer completion. Compared with the existing models, the presented model added a simulation sub-region representing open-hole annular space, which could help to simulate the flow and heat transfer caused by the inflow from fracture and outflow into production pipe. The presented model was used for investigating the temperature behavior of the two-segment flow regime in synthetic cases,
Declaration of competing interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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