非常规龙马溪组和牛蹄塘组页岩取心技术

Abstract

Abstract:

During the drilling process of the shale gas wells, obtaining the high quality core samples is an important prerequisite for the reservoir evaluation. Aiming at the problems such as the long coring footage, the low core recovery and the poor efficiency of the conventional coring technology, and based on the analysis of the geological characteristics of the coring layer, we optimized and improved the tools, the bit, the parameters and the technology. In the field application of the multiple shale gas wells, the average core recovery was more than 98 % and the penetration rate was up to 9 m/h. The results showed that this technology had wonderful performance in improving the core recovery and the penetration rate, and successfully resolved the various problems in the process of the coring in the shale gas wells. In the meantime it provided important support for the later development of the shale gas wells.

Key words: unconventional, shale gas, coring, penetration rate, Longmaxi formation, Niutitang formation

CLC Number:

TE92

Huaqing Cao,Changbin Gao. Shale coring technology in Longmaxi formation and Niutitang formation of unconventional shale gas field[J]. Reservoir Evaluation and Development, 2018, 8(2): 80-84.

Figures/Tables 12

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层号	顶深/ m	底深/ m	厚度/ m	常规测井				ECS测井				ELAN成果						总气含量/(m³·t^-1) (地层压力系数=1.1)
				自然伽马/ API	深电阻率/ (Ω·m)	密度/ (g·cm^-3)	中子, %	硅质含量, %	黏土含量, %	碳酸盐含量, %	黄铁矿含量, %	有效孔隙度,%			TOC,%			总气含量/(m³·t^-1) (地层压力系数=1.1)
				自然伽马/ API	深电阻率/ (Ω·m)	密度/ (g·cm^-3)	中子, %	硅质含量, %	黏土含量, %	碳酸盐含量, %	黄铁矿含量, %	最大	最小	均值	最大	最小	均值	最大	最小	均值
1	3 798.0	3 805.4	7.4	177.0	0.4	2.7	11.8	47.3	25.9	22.6	3.3	3.0	0.5	1.7	6.8	2.3	5.6	0.59	0.20	0.49
2	3 805.4	3 813.2	7.8	269	0.5	2.7	13.1	57.8	25.1	10.3	5.4	2.8	0.6	1.3	5.0	2.7	4.1	0.44	0.23	0.36
3	3 813.2	3 839.8	26.6	550.0	0.2	2.6	13.1	64.6	19.3	10.3	5.2	3.1	0.6	2.0	10.5	4.8	7.9	0.91	0.42	0.69
4	3 839.8	3 845.0	5.2	484.0	0.8	2.7	9.9	49.4	23.8	20.6	3.1	2.6	0.2	1.4	7.5	2.3	4.7	0.65	0.20	0.41
5	3 871.0	3 880.7	9.7	187.0	3.8	2.7	8.6	57.5	12.3	24.6	4.8	2.2	0.4	1.0	5.1	1.0	2.7	0.44	0.10	0.24

稳定器情况	临界钻压/kN
取心筒两端加稳定器	384.4
取心筒上端加稳定器	182.9
取心筒下端加稳定器	110.3
不加稳定器	49.0

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Shale coring technology in Longmaxi formation and Niutitang formation of unconventional shale gas field

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