Development and Experiment of Electronic Toe-End Frac Sliding Sleeve
It has high economic benefits to use the toe-end frac sliding sleeve to replace coiled tubing perfora-tion in the first section fracturing construction of horizontal wells.However,the conventional toe-end sliding sleeve is difficult to meet the first section fracturing of oil and gas wells with narrow opening pressure window;therefore,an electronic toe-end frac sliding sleeve was developed in the paper.With the help of a specially designed low-cost locking and unlocking control system,the customized pressure waveform was used to realize remote triggering un-locking,effectively avoiding the risks related to pressure of sliding sleeve during the construction process.Moreo-ver,the structure and function of electronic toe-end frac sliding sleeve were designed,and the pressure signal ac-quisition accuracy,overall energy consumption and unlocking performance of it were tested on the ground.The re-search results show that the pressure acquisition accuracy is affected by the friction of the sealing element;when the pressure exceeds 50 MPa,the difference between the collected pressure and the actual pressure remains stable at about 3 MPa;the electronic toe-end frac sliding sleeve only needs 9 mA of continuous working current in a 150℃ environment,and the overall energy consumption is 216 mA·h/d;in ground tests,the electronic toe-end frac sliding sleeve can successfully recognize pressure waveform signals and unlock electromagnetic hydraulic locks,with a maximum test pressure coming to 98 MPa.The research results provide choices for oil and gas development of deep and ultra-long horizontal sections.
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