Research and Application of Soluble Balls for Segregated Open Hole Completion in Ultra-Deep Carbonate Reservoirs
According to the technological characteristics of segregated open hole completion in ultra-deep car-bonate reservoir of No.5 belt in Shunbei oilfield,a controllable soluble fracturing ball was studied and designed to solve 3 problems such as high acid corrosion resistance,high-speed solubility and high-pressure resistance.A"base+coating"structure was adopted for the soluble ball:magnalium was used as base material,a modified tef-lon+phenolic resin nanophase material was selected for coating,and an organic coating was used to conduct sur-face treatment on magnalium.A pressure bearing numerical simulation analysis,an acid resistance pressure bear-ing test and a high-temperature dissolution test were conducted on the newly developed soluble balls respectively,and finally,they were applied in Well Shunbei 4-13H.The research results show that the newly developed soluble ball can withstand high temperature of 160℃,high pressure of 70 MPa,is resistant to acid,and can dissolve at high speed;the average dissolution rate is 7.19 g/h,and complete dissolution only takes about 12 h;it meets the dual requirements of pressure bearing during fracturing and fast dissolution during production without blocking the channel;it can effectively improve the applicability and effectiveness of soluble balls in segregated open hole com-pletion process in the Shunbei block,and meet the needs of field application.The research results provide refer-ence for the segregated completion technology of horizontal wells in the oilfield.
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