【正文】 There should be no fluid flowing out of bypass hole. To do this is only for checking bit rotation. It should not last longer. In the operation, it should prevent the bit from touching wellhead blowout preventer and flow line. After pump stops, check bypass valve in open position or not, and fluid flowing out of bypass valve or not. Do not lift the valve over turntable until pump pletely stops as to protect the platform from pollution 6． Disassembly kelly and bine the screw drill in accordance with the program. Connect bent sub, nonmagic collar and stabilizer etc. separately . If you make deflection with muleshoe, before twisting bent sub into bypass valve, you should examine deflecting key to ensure muleshoe sitting in normal working position, and align the scale line of connector and bent sub. During the period of screw drill bination and drill pipe connection, pay attention to avoiding thread gluing and alternation. In order to prevent thread from moving in the operation, it is advised to keep in mind: Rotary direction of bit sub opposite the shell is counter clockwise. If you rotate turntable or clamp motor with turntable in wrong direction, thread loosening and thread off will occur on parts inside the screw drill. This is caution for the customers. Trip in the bined screw drill into borehole: Even though the outside of screw drill looks simple and it has enough rigidity, it still needs controlling tripin speed ,when drillers are stripping in screw drill. Otherwise, the screw drill may be damaged by san bridge, hole shoulder or casing shoe in the hole. When this happens, it is usually required to start pump, slowly to extend the hole for its passing. If it is a bent sub or bent shell, it is easily for bit side to touch the hard rock status and casing shoe etc on the bore wall. So periodically rotate screw drill bination to eliminate the influence of lateral drilling. As to deep and hitemperature well, it is advis。 如果用彎接頭或彎殼體，鉆頭側(cè)面就更容易碰上井壁的硬巖層和套管鞋等，因此要周期性的轉(zhuǎn)動(dòng)鉆具組合，以消除側(cè)鉆的影響。 6． 2 把鉆具及其組合下到井眼里：盡管鉆具本身外形簡(jiǎn)單 ，且有足夠的剛性，司鉆下放鉆具時(shí)，仍需控制下放速度，否則易被井眼中的沙橋、井眼臺(tái)肩、套管鞋所損壞。為防止操作中移扣，建議裝卸過(guò)程中應(yīng)牢記：鉆頭接頭相對(duì)于殼體的旋向?yàn)楦┮暦磿r(shí)針?lè)较?。將彎接頭擰入旁通閥之前，如果用斜口管鞋座造斜，應(yīng)檢查造斜鍵，保證斜口管鞋座處于正常的工作位置，并保證與接頭的彎頭刻線對(duì)準(zhǔn)。泵未完全停止之前，不要把旁通閥提到轉(zhuǎn)盤(pán) 以上，防止污染井臺(tái)。 The energy loss will be shown from the pressure loss. Total pressure loss can be calculated by accumulating pressure loss in each portion. After calculation of total pressure loss according to the determined drilling depth, it can be a parameter to determine the pump pressure. It is plicated to calculate large amount of pressure loss. Therefore, the site operator can adapt a simple method. Only by lifting the bit a little bit from the bottom, the reading on the pressure gauge of main pipe shall be the mentioned total pressure loss at the rated flow rate. 6. Application When selecting the screw drill and its bination, you should work out drilling program, fully consider hole size, hole trace, bit type, specification, formation structure and hydraulic calculation. Surface Checking Before Tripping in Except lifting the connections between nipple and bypass valve, other connections on shell of screw drill shall be coated with locking agent. Assembly bit on the handling device, Counter clockwise rotate the drive shaft ends only with chain wrench to protect the inside threads from loosening . Hoist lifting sub and put screw drill into turntable and bypass valve into the center in easy watch position. And then clamp tightly screw drill with slips, and disassembly lifting sub. Check bypass valve: Press downward the valve stem with hammer handle or wood stick. Fill water from the top into the valve ,there should no leakage from the valve and no great drop of water level .And then loosen the stick, the valve stem is springed up to its original position. The filled water shall flow out evenly from the side holes. This is normal . 6． 1． 5 Connect and low down the kelly. Put bypass valve under the kelly in easy watch position. Start pump, and gradually increase flow rate till bypass valve is closed. Lift the screw drill to watch bit rotating. Now bypass valve is in ―close‖ position. 上海奧森油田服務(wù)有限 公司 Shanghai Ocean Oilfield Service Co. Downhole Motor 12 不應(yīng)有鉆井液從旁通孔流出，檢查的目的僅是看鉆頭是否旋轉(zhuǎn)，不必持續(xù)很長(zhǎng)時(shí)間，操作過(guò)程中應(yīng)避免鉆頭與井口防噴器、井口管線接觸、碰撞。 6． 1． 4 檢查旁通閥：用錘柄或木棒向下壓旁通閥芯，從上部向旁通閥注滿(mǎn)水，此時(shí)旁通閥應(yīng)不漏，水面無(wú)明顯下降，然后挪走木棒，閥芯應(yīng)被彈簧彈 起復(fù)位，所注水應(yīng)從側(cè)面各孔均勻流出，即可認(rèn)為正常。 6． 1． 3 吊起提升短節(jié)，把鉆具放入轉(zhuǎn)盤(pán)中，把旁通閥置于轉(zhuǎn)盤(pán)中易于觀察的位置。 6． 1 鉆具下井前的地面檢查； 6． 1． 1 鉆具除提升短節(jié)與旁通閥連接外，其他部分的殼體連接均涂以鎖緊劑。對(duì)于現(xiàn)場(chǎng)操作者來(lái)說(shuō)可以采用一種簡(jiǎn)便的做法，只要將鉆頭稍稍提離井底，在額定排量下，主管壓力表上的讀數(shù)值就是上述總壓力損失值。這一能量損失以壓力損失表現(xiàn)出來(lái)。 5． 8 預(yù)先進(jìn)行必要的水利計(jì)算：鉆井作業(yè)時(shí)，由泥漿泵泵出的鉆井液依次經(jīng)立桿、水龍頭、方鉆桿而進(jìn)入鉆桿、鉆鋌、無(wú)磁鉆鋌、鉆具（馬達(dá)）、鉆頭水眼及環(huán)空而返回地面。一旦鉆具發(fā)生制動(dòng)，應(yīng)迅速將鉆具提離井底降低鉆壓，因?yàn)殂@井液長(zhǎng)時(shí)間流過(guò)不轉(zhuǎn)的馬達(dá)會(huì)使鉆具嚴(yán)重?fù)p壞。如果泵壓表突然增加了幾兆帕，繼續(xù)增加鉆壓 ，泵壓不再增加，這說(shuō)明鉆具發(fā)生了泄漏，此時(shí)鉆具定子與轉(zhuǎn)子間密封破壞，鉆井液通過(guò)破壞的馬達(dá)密封腔從鉆頭水眼中流出。繼續(xù)增加鉆壓，當(dāng)循環(huán)鉆井液在馬達(dá)兩端產(chǎn)生的壓降超過(guò)最大設(shè)計(jì)值時(shí)，鉆具將發(fā)生泄漏。 5． 7 鉆井液壓力與鉆壓的特點(diǎn)：鉆具進(jìn)行空運(yùn)轉(zhuǎn)時(shí)，若保持泥漿流量不變，鉆具與鉆頭的壓降為一個(gè)常數(shù)，該值隨鉆具型式和規(guī)格的不同而有所不同。C of rated temperature and 150176。C of maximum temperature。C, stator life may be greatly shortened, even by using optimum oil base mud or using water base mud. In order to keep screw drill working normally at high temperature of oil base mud, the way shall be adapted to conduct tripin by sections and intermittent recycling , to ensure the actual temperature of stator below the ultimate value by using hollow rotor with splitter hole to speed up recycling or improve heat radiation of the fluid and other property. Our pany manufacture two kinds of stators. One is