【正文】 site 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。 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。 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。使用油基泥漿液，井底溫度低于 95 C，鉆具工作狀態(tài)最佳。 A：除了鉆頭水眼造成的壓降外，要使鉆井液流經(jīng)鉆頭底部時別再形成其他較大的壓力損失，尤其是鉆頭水眼壓降已達到該型號鉆具規(guī)定的壓降值時更應(yīng)注意。 5．使用須知 5． 1 井場鉆井技術(shù)人員和司鉆必須了解鉆具的結(jié)構(gòu)原理和使用參數(shù)。因此在選擇轉(zhuǎn)子噴咀尺寸時，應(yīng)確保馬達密封腔流量始終保持或高于最小推薦流量值，這樣才能使馬達正常運轉(zhuǎn)。橡膠內(nèi)孔是具有一定幾何參數(shù)的螺旋。 3．螺桿鉆具的組成 螺桿鉆具由旁通閥、馬達、萬向軸和傳動軸四大總成組成（如圖 1） Introduction Shanghai Ocean Oilfield Service Co supplied Downhole Motor to Drilling Department of Bohai Offshore Oil Company LTD.(Tianjin), on base of mastering foreign and domestic advanced technology and linking China national situation, has developed and manufactured some types of screw drills in cooperation with oilfields and scientific research institutes. With them, we may provide satisfactory services to the oilfields. This manual mainly introduces screw drill property, application and cautions, so as for the customers to know well our screw drills, and to do better selection, application, repair and maintenance of screw drill according to drilling demand. As a result, our screw drill may bring into play in its reliable technical function, to enhance drilling economic efficiency. Principle Screw drill is a kind of downhole dynamic drilling tool upon the power of drilling mud. Mud stream from the outlet of mud pump flows through a bypass valve into the motor. This stream produces pressure loss at both inlet and outlet of the pump, to push the rotor into rotating, and to transmit the torque and speed onto the bit. The screw drill property mainly depends upon its property parameters Constitution Screw drill is posed of four assemblies of bypass valve, motor, cardan shaft and drive shaft ( Fig. 1) . 上海奧森油田服務(wù)有限 公司 Shanghai Ocean Oilfield Service Co. Downhole Motor 2 3． 1 旁通閥 總成 它有旁通和關(guān)閉兩個位置（如圖2），在起下鉆作業(yè)過程中處于旁通位置，使鉆柱中泥漿循環(huán)繞過不工作馬達進入環(huán)空，這樣起下鉆時泥漿不溢于井臺上?，F(xiàn)場使用的泥漿流量應(yīng)在推薦的范圍之內(nèi) ,否則將影響馬達效率，甚至馬達磨損加快。 3． 4 傳動軸總成 傳動軸的作用是將馬達的旋轉(zhuǎn)動力傳遞給鉆頭，同時承受鉆壓所產(chǎn)生的軸向和徑向負荷。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。 D：提高鉆具和鉆頭的使用壽命，也是一個重要因素。C of rated temperature and 120176。累加各部分的壓力損失后可計算出總的壓力損失，按預計鉆井深度算出總壓力損失后，就可以作為確定泵壓的一個參數(shù)，這種大量的壓力損失計算是很繁瑣的。違反此項規(guī)定，如反向轉(zhuǎn)動轉(zhuǎn)盤或用轉(zhuǎn)盤旋緊馬達以上的扣等，就會造成鉆具內(nèi)部零件的松扣或脫扣，請用戶注意。 6． 1． 6 卸下方鉆桿，按設(shè)計的鉆具組合，分別把彎接頭、無磁鉆鋌、穩(wěn)定器等接好。 另外，要使鉆具獲得最佳工作效率，應(yīng)將鉆具兩端的壓差控制在推薦參數(shù)范圍內(nèi)。 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。 (5) Estimation of Bit and Screw Drill Running Life。 of Screw drill is ?165mm。 Based on the above remended equation, the customers can timely change different diameter nozzles according to the actual demand, so as to reach ideal effect. 上海奧森油田服務(wù)有限 公司 Shanghai Ocean Oilfield Service Co. Downhole Motor 6 3． 3 萬向軸總成 萬向軸的作用是將馬達的行星運動轉(zhuǎn)變?yōu)閭鲃虞S的定軸轉(zhuǎn)動，將馬達產(chǎn)生的扭矩及轉(zhuǎn)速傳遞給傳動軸至鉆頭。圖 3是幾種典型馬達配合的截面輪廊： Bypass Valve Assembly It has two positions of bypass and close (). It is in bypass position during trip operation, circulates mud fluid in the drill string into the annular space bypassing the idle motor, so that no mud may spray out onto the platform during the trip operation. When mud flow rate and pressure reach the setting value, the valve stem moves down and closes the valve. Meanwhile, mud stream flows through the motor, and converts the pressure energy into mechanical energy. As mud flow rate is too low, or mud pump stops, and as the created pressure is not enough to overe spring force and static friction force, the spring presses the stem upward ,and bypass is in open position. Motor Assembly It consists of stator and rotor. Stator is made by squeezing rubber sleeve on the wall of steel tube. There forms spiral structure with a certain geometric parameter. Rotor is a cromeplated screw rod. Stator and rotor matches with each other, to form spiral line and seal cavity through their guide rail difference. With rotor running in the stator, the seal cavity is moving along its axial direction, continuously forms and disappears ,to plete its energy conversion. This is the basic principle of screw drill. Spiral seal line on rotor is divided into single end and multiend ( stator with one more end than rotor). The less ends the motor has, the higher speed and the lower torque is. The more ends it has, the lower speed and the higher torque is. shows the sectional profile of several typical motors. 上海奧森油田服務(wù)有限 公司 Shanghai Ocean Oilfield Service Co. Downhole Motor