Development and Field Test of Toe End Sliding Sleeve for Cementing
In view of the problems such as high cost,long operation time and inability of coiled tubing to run in hole under special well conditions when coiled tubing is used to transmit perforating in the first stage of bridge plug and perforating staged fracturing technology of horizontal well,the technology of ce-menting toe end sliding sleeve is studied.The toe-end sliding sleeve is run in conjunction with the reser-voir casing to cement and complete the well,and the first stage fracturing operation can be carried out through building the well head pressure,and the liquid channel is provided for the bridge plug pumping for the next stage.The toe-end sliding sleeve completion fracturing tool is designed in this paper,the internal pressure strength is 132 MPa,the opening pressure is adjustable,and it has the advantages of reliable open-ing and easy fracturing.After passing the laboratory test,field test was carried out in the super-long hori-zontal well in Mahu area of Xinjiang oilfield.During completion,the toe-end sliding sleeve was reliable in bearing pressure and the cementing operation was completed successfully.In the process of fracturing op-eration,the toe-end sliding sleeve was successfully opened and the first stage of fracturing operation com-pleted,which solved the problem that coiled tubing could not run in the perforating hole,and saved the op-eration time by 1 day.The results show that the developed toe end sliding sleeve can meet the needs of field operation and provide a effective means for the safety and benefit improvement of horizontal wells.
horizontal wellfirst section perforatescoiled tubingtoe slip sleevefield test
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