反洗式水力割刀的研制与应用

Development and Application of Backwashing Hydraulic Cutter

秦皇岛区块大修井作业中打捞防砂管柱需要对其进行分段切割后用捞矛实施分段打捞,将其捞出。切割作业多由水力式内割刀实施完成,然而对于出砂严重的井或漏失量大的井,水力式内割刀能否下钻至设计位置、将砂子冲出并成功实施切割作业就成为大修打捞作业的关键。在普通水力割刀的基础上研制出可反洗式水力割刀,其刀体结构采用硬质合金颗粒与硬质合金刀片结合的刀体结构,使得该割刀能在恶劣的井况下工作,保证切割的成功率。同时使得冲洗工艺与水力切割工艺集成于一趟钻完成,省去了单独下冲洗管柱的时间与成本。现场实施于QHD32-6-C7井等4口井的大修过程中,共使用17次,成功下至设计切割深度并实施切割,切割成功率100%。经济效益显著。

During well overhaul operation in Qinghuangdao Block,salvaging sand control pipe column was needed to be segmented.In generally,cutting operation was completed by internal hydraulic cutters,but for the high sand production wells and the wells with serious lost circulation,it was the critical point if the hydraulic cutter could be run to the designed position to wash out the sand and carrying out the cutting operation.On the basis of the common hydraulic cutter,the backwashing hydraulic cutter was developed,the cutter structure was made of carbide particles and carbide blade,thus the cutter could be operated in severe well condition and ensured the successful cutting.At the same time the flushing operation could be completed in one drilling and saved the time and cost additional running-down of flushing tubular string.It is used in 4wells such as Well QHD 32-6-C7 for well overhaul and it is used for 17 times and it is successfully run into the designed locations with 100% success rate,obvious efficiency is obtained.