【正文】 not. Do not lift the valve over turntable until pump pletely stops as to protect the platform from pollution6． Disassembly kelly and bine the screw drill in accordance with the program. Connect bent sub, nonmagnetic 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 advised periodically to conduct middle way recycling while stripping in the screw drill. Thus, this can protect the bit from plugging or protect stator from damaging due to high temperature. 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)很長時間，操作過程中應(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水，此時旁通閥應(yīng)不漏，水面無明顯下降，然后挪走木棒，閥芯應(yīng)被彈簧彈起復位，所注水應(yīng)從側(cè)面各孔均勻流出，即可認為正常。6．1．3吊起提升短節(jié)，把鉆具放入轉(zhuǎn)盤中，把旁通閥置于轉(zhuǎn)盤中易于觀察的位置。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。對于現(xiàn)場操作者來說可以采用一種簡便的做法，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。5．8預(yù)先進行必要的水利計算：鉆井作業(yè)時，由泥漿泵泵出的鉆井液依次經(jīng)立桿、水龍頭、方鉆桿而進入鉆桿、鉆鋌、無磁鉆鋌、鉆具（馬達）、鉆頭水眼及環(huán)空而返回地面。一旦鉆具發(fā)生制動，應(yīng)迅速將鉆具提離井底降低鉆壓，因為鉆井液長時間流過不轉(zhuǎn)的馬達會使鉆具嚴重損壞。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，這說明鉆具發(fā)生了泄漏，此時鉆具定子與轉(zhuǎn)子間密封破壞，鉆井液通過破壞的馬達密封腔從鉆頭水眼中流出。繼續(xù)增加鉆壓，當循環(huán)鉆井液在馬達兩端產(chǎn)生的壓降超過最大設(shè)計值時，鉆具將發(fā)生泄漏。5．7鉆井液壓力與鉆壓的特點：鉆具進行空運轉(zhuǎn)時，若保持泥漿流量不變，鉆具與鉆頭的壓降為一個常數(shù)，該值隨鉆具型式和規(guī)格的不同而有所不同。5．6對鉆井液流量的要求：螺桿鉆具特點之一，輸出轉(zhuǎn)速與輸入鉆井液流量成正比。C，最高溫度150176。C。一種是普通定子，額定溫度為95176。保證實際定子工作溫度低于極限值。C時，即使使用最佳的油基鉆井液，甚至使用水基鉆井液，鉆具定子壽命也會大幅度縮短。C，鉆具工作狀態(tài)最佳。5．5對井底環(huán)境溫度的要求：溫度過高對鉆具馬達性能十分不利，會使所有不利因素加劇。考慮鉆頭金剛石的幾何尺寸、布置方位、鉆壓負荷與要求井下鉆具轉(zhuǎn)速高、鉆壓小的甚密關(guān)系。D：提高鉆具和鉆頭的使用壽命，也是一個重要因素。在較長周期的鉆井作業(yè)中，最重要的因素就是鉆頭與鉆具作為一個整體，不要由于其中的哪一部分出了問題，而造成不必要的起下鉆。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 conventional stator, with 95176。C: PDC Bit: It is not only used for directional deflection, and also more appropriate to longer drilling period, such as vertical well drilling. During longer period of drilling operation, the more important factor is to integrate bit and screw drill. It is to avoid unnecessary trip operation due to some problem. It is known that PDC bit can last longer time than rock bit, and it is integral in structure, having more advantages.D: It is also an important factor to prolong running life of bit and tool. It is helpful to extend screw life and to develop bit property by improving stability of drive shaft, . stabilizer. And it shall be considered the close relationship between diamond geometric dimension, allocation , drilling weight load and the required high speed and lower drilling weight of downhole tool. In general, it is hard to obtain satisfactory effect without strictly matching bit and screw drill, it can also cause earlier damage onto the tool. Requirement for Hole Bottom Temperature: It is unfavorable to the motor property, and it may intensify all disadvantageous factors if temperature goes too high. When using oil base mud, the hole bottom temperature shall be lower than 90176。這對牙輪鉆頭不必擔心，但是PDC鉆頭冠部液體通道的設(shè)計，就必須考慮通道過流面積是否可能造成額外過多的壓力損失問題，同時并能保證巖屑及時排出及鉆頭冷卻需要。 什么樣的地層結(jié)構(gòu)、地層軟硬、使用哪類鉆頭、用什么樣的刃部設(shè)計，請參考有關(guān)鉆頭的專業(yè)資料，這里僅就使用螺桿鉆具完成各種鉆井作業(yè)，對鉆頭的選擇作些簡要說明。因此螺桿鉆具是否能成功的發(fā)揮作用的幾個因素中，鉆頭與鉆具的匹配是最重要的，希望能引起現(xiàn)場使用人員的重視。同時注意鉆井液中不要混有各種氣體，因為混有氣體的鉆井液在鉆具中壓力的變化下容易產(chǎn)生“氣蝕作用”，加速鉆具的損壞，尤其是定子橡膠更容易被氣蝕壞，必須予以足夠的重視。(6) Design of Bit Nozzle Pressure Loss Please refer relevant professional information for detail bit selection on formation structure. Hereby it briefly describes bit selection for performance of drilling operation with screw drill.A: Except bit nozzle pressure loss, in order to avoid producing higher pressure loss while drilling fluid flowing through bit bottom, attention shall be specially paid to this matter when the nozzle pressure loss has reached the specified loss value of this kind drilling tool. This does not affect rock bit, but for the crown passage design of PDC bit. The problem shall be considered that passing fluid area may cause much extra loss, meanwhile to ensure prompt discharge of cuttings and bit cooling.B: Rock Bit : When this kind of bit is used with screw drill it is more appropriate to shorter drilling period, such as directional deflection and reentry etc.工藝的需要。(4) Determined Mechanical Drilling Speed。(2) Formation Edge Structure。 Bit nozzle pressure loss is Mpa