小井眼提速技术在页岩油开发中的应用

doi:10.13809/j.cnki.cn32-1825/te.2023.01.009

Abstract

Abstract:

The shale oil development in Sinopec Jiangsu Oilfield is facing the problems of high investment and low production. After 45 years of development, there are a lot of abandoned old wells. Developing shale oil by old borehole side drilling can reduce drilling costs. In 2022, the sidetracking slimhole horizontal drilling in old wells is carried out in Huangzhuang. The slimhole drilling tools have the problems of large flexibility, difficult track control, slow drilling speed, small clearance, large air pressure consumption, poor cementing quality and high well control risk. In order to solve these problems, a system of efficient sidetracking slimhole horizontal drilling technology system is formed by the applications of large casing windowing, well track optimizations, high-efficiency drill bit+screw+LWD geosteering drilling, foam cementing, oil-based drilling fluid plugging, narrow gap well controlling, small hole coring, etc. A test application in H2CHF well shows that the actual drilling speed is up to 5.0 m/h, which is equivalent to the conventional drilling speed in adjacent wells, and the total drilling cost is reduced by 50 %, saved by 15 million. The new development and test would provide important ideas and reference for future development of shale oil in Jiangsu Oilfield.

Key words: shale oil, slimhole, trajectory optimization, ROP enhancement technique, oil-based drilling fluid, foam cementing

CLC Number:

TE246

Xin XIE,Zhengdao DOU,Xiaomin YANG, et al. ROP enhancement technique for slimhole drilling in shale oil development[J]. Reservoir Evaluation and Development, 2023, 13(1): 83-90.

Figures/Tables 15

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References 20

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开钻次序	井深（m）	井眼尺寸(mm)	套管尺寸(mm)	套管下深(m)
导眼井	2 904~3 680	152.4	裸眼完井	裸眼完井
H2CHF	3 140~4 650	152.4	114.3	4 634.63

井深 ( m)	井斜(°)	方位(°)
2 959.96	3.78	118.64
2 988.91	6.02	115.54
3 017.87	6.02	115.84
3 046.83	6.24	122.64
3 075.81	6.90	123.64
3 104.77	6.68	124.74
3 133.73	6.81	121.84
3 163.67	6.99	122.94
3 181.94	6.68	132.04

深度（m）	泊松比	杨氏模量（MPa）	脆性（%）
3 602.63~3 602.83	0.24	22 537.13	41.0
3 606.93~3 607.09	0.25	18 956.30	36.4
平均			38.7

序号	钻头直径(mm)	钻头型号	类型	钻头数量	使用井段（m）	进尺（m）	机械钻速（m/h）
1	152.4	HJT517GL	牙轮	1	2 895~3 119	224	1.78
2	152.4	PK4232SJ	PDC	2	3 119~4 596	1 477	5.20
3	152.4	FL1654JH	PDC	1	4 596~4 650	54	3.04

序号	堵漏浆配方	砂床目数	时间（min）			实验压力
序号	堵漏浆配方	砂床目数	时间（min）	1 MPa	2 MPa	3 MPa	4 MPa	5 MPa
1	井浆+1 %复合堵漏剂	30~50	30	62 mL	91 mL	105 mL	122 mL	全失
2	井浆+1 %复合堵漏剂+1 %竹纤维	30~50	30	无滤失	10 mL	12 mL	14 mL	15 mL
3	井浆+2 %复合堵漏剂+1 %竹纤维	30~50	30	无滤失	3 mL	8 mL	10 mL	12 mL
4	井浆+4 %复合堵漏剂+4 %竹纤维	30~50	30	无滤失	1 mL	3 mL	5 mL	8 mL

ROP enhancement technique for slimhole drilling in shale oil development

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项目	水泥浆配方	密度（g/cm³）
泡沫领浆	葛洲坝G级水泥+16 %高强度中空玻璃微球+12 %微硅+5 %降失水剂+8 %弹性材料+5 %增韧剂+5 %胶乳+3 %减阻剂+3 %缓凝剂+自来水+3 %发泡稳泡剂	1.30
泡沫尾浆	葛洲坝G级水泥+30 %石英砂+5 %降失水剂+8 %弹性材料+5 %增韧剂+8 %自愈合+3 %减阻剂+3 %缓凝剂+自来水+3 %发泡稳泡剂	1.80

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