ROP Improvement in Deep Formations in the Daqing Oilfield

To improve the ROP in deep formations of the Daqing Oilfield in order to accelerate the exploration and development process, relevant techniques were reviewed with the gool of determining and ideal process.Based on available ROP improvement achievements for deep formations in China and abroad, different technical solutions were proposed for spudding in, and for drilling through different formations.Then, the drilling technique series from top to bottom were confirmed for the Daqing Oilfield’s deep formations.PDC bits (e.g.T1951DB, CK506 and CK606) were selected and applied for the 2nd spud formations, with the drilling time controlled within 25 d.By comparing the field test results of the three solutions (e.g. the hydraulic rotary impact tool, turbine drills and air drilling techniques), for the 3rd spud formations, it was confirmed that the gas drilling technique was applicable for intervals with shortest length of 900 m, the hydraulic rotary impact tool was applicable for the intervals with a drillability grade less than 7, and the turbine drills were applicable for the hard formations with drillability grade more than 7.The application of these techniques in 19 wells showed that the average drilling time was shortened by 48.60 d.The study results indicated establishing the drilling technique protocols addressed the previously indentified problem impeding ROP improvement in deep formations of the Daqing Oilfield, such as unitary technique tests, less integrated applications and unobvious overall effects of improvement.