车排子超浅水平井一趟钻螺杆钻具设计及应用  

Design of One-Trip PDM for the Ultra-Shallow Horizontal Well in Block Chepaizi and Its Application

作　　者：董志辉 杨泽宁 DONG Zhihui;YANG Zening(Research Institute of Drilling Technology,Sinopec Shengli Petroleum Engineering Co.,Ltd.,Dongying 257017,Shandong,China)

机构地区：[1]中石化胜利石油工程有限公司钻井工艺研究院,山东东营257017

出　　处：《新疆石油天然气》2022年第4期33-37,共5页Xinjiang Oil & Gas

基　　金：中石化集团公司科技攻关项目“准噶尔盆地钻井提速提效关键技术研究”(P21077-6)。

摘　　要：新疆车排子超浅水平井由于目的层埋深浅、成岩性差、可钻性差别大、实钻造斜率偏低且不稳定,增斜段需使用大度数螺杆钻具控制轨迹。大度数螺杆钻具复合钻扭矩大,易发生螺杆故障,不利于安全钻井;水平段需起钻更换小度数螺杆钻具;大度数螺杆钻具不能满足一趟钻完成二开直井段、斜井段、水平段轨迹控制及安全钻井需要。分析认为新疆车排子超浅水平井一趟钻技术要求螺杆钻具既要有较高的造斜率,又要能够降低螺杆钻具复合钻扭转力,以避免螺杆脱扣或断裂故障,据此优化设计了符合要求的短弯点螺杆钻具。短弯点螺杆钻具是将常规螺杆钻具弯点至钻头底部的距离由1.8 m优化调整为1.3 m。调整后螺杆造斜能力基本不变,但螺杆偏移值由0.056 m降至0.038 m,进而降低了螺杆钻具壳体在复合钻进工况下所受的扭转力,扭转力值由3.7 kN·m降至1.5 kN·m。能够通过滑动钻进和复合钻进相结合的方式对轨迹进行有效控制,实现一趟钻完成新疆车排子区块超浅水平井定向施工。Because the ultra-shallow horizontal well in Block Chepaizi of Xinjiang has shallowly-buried target layer,poor diagenesis,large difference in drillability,and very low and unstable angle-building rate,large-degree progressive displacement motor(PDM)is needed to control the trajectory of the angle-building section.A large-degree PDM has large torque during compound drilling,and is very likely to have screw failure,which is not conducive to safe drilling.For the drilling of horizontal section,it is necessary to trip out and replace the large-degree PDM with a small-degree one.A large-degree PDM can neither achieve trajectory control for the secondspud vertical section,the deviated section and the horizontal section in one trip nor satisfy the demand for safe drilling.The analysis shows the one-trip drilling technique for the ultra-shallow horizontal well in Block Chepaizi requires that the PDM should not only have a high angle-building rate,but also be able to reduce the torsional force produced by compound drilling,so as to prevent the screw from twisting off or breaking off.Based on this,short-bend point PDM that meets the requirements is optimized and designed,which has the distance from the bend point of a conventional one to the bottom of bit adjusted to 1.3 m from 1.8 m.After such adjustment,anglebuilding ability of the screw is basically unchanged,but the screw offset value is reduced from 0.056 m to 0.038 m,which further reduces the torsional force acting on the PDM enclosure under compound drilling conditions from 3.7 kN·m to 1.5 kN·m.The newly-designed PDM can effectively control the trajectory by way of slide drilling combined with compound drilling,and complete the directional drilling operation of the ultra-shallow horizontal well in Block Chepaizi in one trip.

关 键 词：超浅水平井 短弯点螺杆 一趟钻 螺杆钻具 车排子 

分 类 号：TE242[石油与天然气工程—油气井工程]