【正文】 cal parameter of low pressure and low speed to mence drilling so as to ensure a vertical hole. Once open the borehole, set protection pipe timely with depth of 2m.2）Master drilling parameter reasonably in the course of normal drilling according to stratum conditions, and do not increase pressure casually. Drilling pressure shall not more than 80% of the weight of drilling collar, and should be controlled within the maximum pressure of first bending.3）Operate carefully and keep drilling pressure uniform, operators should observe drilling pressure indicator with care to avoid unstable pressure and contrived pressure increasing.4）Operators should observe the following conditions during drilling: drilling pressure indicator and pump pressure meter。 drilling speed normal or 30not。 whether bit jumping。 sludge discharge and rock scrap situation。 sludge performance change, consumption and leakage condition。 turnplate running and torsional moment changes。 motor running sound, current value and strap moving situation。 equipment running normal or not. Pull up drilling tools immediately and take relevant measures once discover abnormal phenomenon. 5）Forbid starting turnplate with increasing pressure。 avoid mangling drilling bit and twisting off drilling tools.6）Drilling tools shouldn’t be stayed in boreholes without working under no circumstance. Arrange specific personnel to move drilling tool with a range of more than 2m in vertical direction once stop drilling for some reasons.7）Shall not pull drilling tools with strong force but operate pump to eliminate block elements once drilling is blocked. 8）Keep sludge performance meet designed requirement in the course of drilling, hold sufficient pump pressure and discharge capacity and keep hole bottom clean. 9）Examine drilling bit carefully before drilling and after drilling。 check screw thread, gear, gear teeth, water hole, bearing, etc. carefully, forbid getting into boreholes once find problems. 10）Check drilling tools carefully。 bend, attrited, blocked, unwell fastened welded drilling pipes or pipes with scar shall not be used. Before lowering down drilling tools into the hole, clean screw thread, and coat screw thread oil. 11）Prepare fishing tool at site, and ensure it can lower down drilling tools for saving at any moment. 12）Keep strict shift system. Drilling tool bination, drilling parameter, bit running time, borehole inner condition, equipment operation condition, drilling speed, and all other regulated conditions should be reported clearly. 13）Conduct sampling and stratum judgment work carefully, record drilling progress and simple hydrologic observation results.14）Analyze and determine stratum conditions before finish drilling a borehole, then get out core with core sampling tools and decide whether to end this borehole. 31 Geophysical Well LoggingConduct geophysical well logging with well logging instrument when finishing drilling a borehole. Geophysical surveyors shall describe the stratum and lithology conditions and submit relevant data according to well logging data, then geological technicians shall plan well pipe structure based on stratum data. Well CompletionI. Process flow of well pletion Array well pipessmooth boreholechange sludgelower down pipeschange sludge inside pipesput into gravelstop water consolidate shaft wallflush well II. Well pletion technique1）Array well pipesArray well pipes according to geophysical well logging results. Well screens and sediment pipes shall be not less than 30m and 5m respectively. Within from well opening shall be kept free. 2）Lower down pipesLower down the whole pipes into well at one time and connect pipes of different diameter with reducers. The specific technological requirements are as follows: ① Prepare everything well before lowering down pipes: wellpletion material checking, equipment, instrument amp。 meter checking, site cleaning, personnel allocation. ② Smooth and flush borehole, and only after correcting borehole depth can lower down pipes.③ Well pipe connection shall adopt the method of pipe hoop welding. ④ Ensure vertical connection and welding quality, make sure no slaginclusion in welding line, and no leaking welding, blowhole and other defects, and ensure stable welding amp。 no water seepage. 32⑤ Control the speed of lowering down pipes properly, observe liquid level inside and outside pipes, and recharge clean water into pipes timely. ⑥ Operate with care and cooperate closely in the course of lowering down pipes to prevent tools and other sundries from falling into wells.⑦ Well pipes must be connected according to planned order, and the bottom section of pipes must be equipped with a borehole flushing tray. 2）Put into gravel, stop water, and consolidate shaft wall ① When well pipe reaches preset position, fix wellpipe pile on holeopening plate of drilling rig. Then get down drilling tools to holeflushing tray for hole washing and slurry changing. ② Put into gravel in dynamic water, and follow strictly operation regulation. Filtering material adopts Ф24mm sand. ③ After putting gravel, put clayey ball for waterstop, and waterstop position shall follow geological design requirement.④ In nonwaterstop section, shall put into gravel for cementing. Well Flushing amp。 Pumping TestI. Well flushing: after well pletion, set one submersible pump into the well to flush the well, and carry out pumping test when water level bees steady and water volume reaches the requirement of detailed design. If water volume can’t meet the designed value, use air pressor to wash the well until the water volume reaches designed value. II. Pumping test: conducted according to geological technical requirement. Water Sampling amp。 Individual Well Final AcceptanceI. Water sampling 33According to d