长宁威远区块页岩气水平井提速技术研究

发布时间：2018-03-18 14:29

本文选题：页岩气　切入点：长宁　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：长宁-威远是中石油第一个国家级页岩气示范区,仅2016年示范区生产页岩气10.11×108m3,预测至2034年底长宁-威远累计产气300×108 m3。虽然长宁-威远国家级页岩气示范区的勘探开发取得了长足的发展,但钻井周期长、机械钻速慢和井下复杂情况多发等因素严重制约了长宁-威远区块页岩气的勘探开发速度。本文在系统分析长宁-威远页岩气区块工程地质特征和完钻井实钻分析的基础上,梳理出长宁-威远区块页岩气钻井面临的重点难点。基于此,提出了长宁-威远区块页岩气钻井综合提速技术措施,内容包括:井身结构优化设计、井工厂模式下的轨迹优化设计、强研磨性PDC钻头优选优化、气体钻井及旋转导向等钻井提速配套技术,并进行了现场应用,研究取得的主要认识有:(1)长宁-威远区块钻井难点为:表层嘉陵江组、二叠系茅口组易漏;上部直井段地层易斜;茅口～栖霞地层研磨性强,可钻性差;韩家店～石牛栏地层泥浆条件下钻速极低,PDC钻头易磨损;龙马溪地层易垮塌;三维轨迹难控制,摩阻大,易托压,定向效果差。(2)长宁区块优化后的井身结构方案为:一开Φ762 mm(钻头)+Φ720 mm(套管)嘉陵江组,二开Φ406.4 mm(钻头)+Φ339.7 mm(套管)飞仙关顶,三开0311.2 mm(钻头)+Φ244.5 m(套管)韩家店顶,四开0215.9 mm(钻头)+Φ139.7mm(套管)龙马溪底。威远区块:一开Φ660.4mm(钻头)+Φ508mm(套管)沙溪庙,二开Φ406.4 mm(钻头)+Φ339.7mm(套管)凉高山顶,三开Φ311.2mm(钻头)+Φ244.5mm(套管)龙马系顶,四开Φ215.9mm(钻头)+Φ139.7mm(套管)龙马溪底。(3)将常规的三维轨迹优化为双二维轨迹,不仅使得水平井的轨迹易控制,还能够有效防碰和降低摩阻。(4)长宁区块PDC钻头优选结果为:CK505(飞仙关-长兴),FX55(龙潭-梁山),MM55(龙马溪);威远区块为:T1655(沙溪庙-须家河),MSi616(雷口坡-嘉陵江),SF56(飞仙关-龙潭),MDsi613(茅口-梁山),HCD506ZX(龙马溪)。(5)综合提速配套技术措施为:表层采用PDC+螺杆+钻井液/气体钻打快技术;采用PDC+弯螺杆+MWD技术进行斜直井段的快速钻进;将井工厂的三维井眼轨迹优化为双二维轨迹(斜直井+定向井/水平井),将研磨性差的韩家店～石牛栏地层优化成斜直井段钻井,采用氮气钻井提速;造斜段采用旋转导向、水平段采用优选PDC钻头+旋转导向/耐油螺杆(带水力震荡器)进行防塌打快;储层龙马溪易漏地层采用控压钻井技术。综合提速技术应用效果显著,与提速前相比,平均周期降低了 18天,平均钻速提高了58%。长宁-威远区块页岩气综合提速技术措施的应用,为国家级页岩气示范区的安全经济高效开发提供了保障。
[Abstract]:Changning-Weiyuan is PetroChina's first national shale gas demonstration zone, Only in 2016, 10.11 脳 108m3 shale gas was produced in the demonstration area, and the cumulative gas production of Changning Weiyuan was predicted to be 300 脳 108m3 by end of 2034. Although the exploration and development of Changning Weiyuan National Shale Gas demonstration area has made great progress, the drilling period is long. The slow drilling speed and complex downhole conditions seriously restrict the exploration and development speed of shale gas in Changning-Weiyuan block. Based on the systematic analysis of the engineering geological characteristics of Changning-Weiyuan shale gas block and the analysis of real drilling, Combing out the key points and difficulties faced by shale gas drilling in Changning-Weiyuan block. Based on this, the comprehensive speedup technical measures for shale gas drilling in Changning-Weiyuan block are put forward, which include: optimum design of wellbore structure, The trajectory optimization design in well factory mode, the optimization of PDC bit selection and optimization, gas drilling and rotary steering drilling speed raising matching techniques are carried out in the field. The main knowledge obtained from the study is that the difficulties of drilling in Changning Weiyuan block are: the surface Jialing River formation, the Permian Maokou formation easy to leak, the upper vertical well formation easy to deviate, the Maokou-Qixia formation having strong abrasive property and poor drillability; Under the condition of Hanjiadian ~ Shi Niulan formation mud, PDC bit with extremely low drilling speed is easy to wear; Longmaxi formation is easy to collapse; 3D trajectory is difficult to control, friction is large, easy to support pressure, The optimized well structure scheme of Changning block is as follows: one opening 桅 762mm (bit) 桅 720mm (casing) Jialingjiang formation, two opening 桅 406.4 mm (drill bit) 桅 339.7 mm (casing) Feixianguanding, three opening 0311.2 mm (drill bit) 桅 244.5 m (casing) Hanjiadian Ding, Open 0215.9 mm (bit) 桅 139.7mm (casing) Longmaxi bottom. Weiyuan Block: open 桅 660.4mm (bit) 桅 508mm (casing) Shaximiao, second open 桅 406.4 mm (bit) 桅 339.7mm (casing) Liangshan roof, Sankai 桅 311.2mm (bit) 桅 244.5mm (casing) Longma system top, Four open 桅 215.9mm (drill bit) 桅 139.7mm (casing) Longmaxi bottom. 3) the conventional three-dimensional trajectory is optimized to double two-dimensional trajectory, which not only makes the trajectory of horizontal well easy to control, The optimum selection result of PDC bit in Changning block is: 1 CK505 (Feixianguan-Changxing FX55 (Longtan Liangshan FX55); Weiyuan block is: T1655 (Shaximiao-Xujia River) MSi616 (Leikoupo-Jialing River F56 (Feixianguan-Longlong). The technical measures of comprehensive speed raising are as follows: the PDC screw drilling fluid / gas drilling technique is used in the surface layer; The PDC bending screw MWD technology is used for the rapid drilling of inclined straight section. The 3D borehole trajectory of the well factory is optimized as two dimensional trajectory (directional well / horizontal well with inclined vertical well), and the formation of Hanjiadian ~ Shi Niulan formation with poor abrasive property is optimized to be drilled in oblique straight section, and the speed of drilling is increased by nitrogen gas, and the direction of rotation is adopted in the diagonal section. In the horizontal section, PDC bit rotation guide / oil resistance screw (with hydraulic oscillator) is used to prevent sloughing and beating quickly, and the controlled pressure drilling technique is used in the reservoir Longmaxi easy leakage formation. The application effect of the comprehensive speed raising technique is remarkable, compared with that before the speed increase. The average cycle is reduced by 18 days and the average drilling speed is increased by 58. The application of comprehensive speed raising measures of shale gas in Changning-Weiyuan block provides a guarantee for the safe economic and efficient development of national shale gas demonstration area.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE243

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