| Development of Oil Bladder for Vertical Drilling Tools |
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| DOI： |
| Key Words: vertical drilling tool ； oil bladder ； seal ； fluo rine rubber |
| Author Name | Affiliation | | ZHOU Zhen-liang | Engineering Technology Research Institute of CNPC Bohai Drilling Co.，Ltd | | FU Bao-qiang | Shanxi Yanchang Petroleum Northwest Rubher Co.， Ltd | | RU Da-jun | Engineering Technology Research Institute of CNPC Bohai Drilling Co.，Ltd | | WANG Hai-yan | Engineering Technology Research Institute of CNPC Bohai Drilling Co.，Ltd | | MA Zhe | Engineering Technology Research Institute of CNPC Bohai Drilling Co.，Ltd | | LI Xiao-peng | Shanxi Yanchang Petroleum Northwest Rubher Co.， Ltd |
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| Abstract: |
| The development of oil bladder used for vertical drilling tools was introduced. Fluorine rubber was used as main material. By using adhesion test，the adhesive type and adhesion process between metal spout and bladder body were determined. The molds for metal spout unit， bladder body and airing filling unit were well designed. The oil bladder passed gas tightness test and hydraulic blasting test. The sealing test was conducted for the vertical drilling tool under pressure of 3 MPa for 15 min and no leak was found. The bladder was good when the pressure was built up t0 6 MPa. In down hole drilling application with hydraulic oil Mobil ATF220 and SCH524，the bladder worked for more than 200 h under pressure of 140 MPa at 150 ℃ continually ， which met the requirements of the vertical
drilling tool. |
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