南川页岩气田岩石抗钻特性参数分布规律研究及应用

Abstract

Abstract:

Rock anti-drillability parameters are important basic parameters for making drilling plan and implementing optimal drilling. In this paper, the computational models of formation anti-drillability parameters such as rock compressive strength, rock drillability level value and rock hardness are established through the rock mechanics testing. After that, combined with the logging data and geological data, the profiles of rock anti-drillability parameters varied with the well depth of different strata for shale gas in Nanchuan are also built up. Based on the analysis of its distribution rule, the bits are selected. The study shows that the characteristic parameters of the strata above Liangshan Formation in the shale gas block of Nanchuan fluctuate greatly, which indicates that the stratigraphic heterogeneity is obvious; the lower strata change more gently, but there is a gradual upward trend from the bottom of Longmaxi Formation. According to rock anti-drillability parameters, bits with good wear resistance, 5 ~ 6 blades, and 13 ~ 16 mm cutting teeth with high density should be selected in bit design. The field application shows that the recommended bit has a good effect and the drilling speed is obviously improved.

Key words: parameter of anti-drillability characteristics, distribution rule, bit selection, shale gas, Nanchuan

CLC Number:

TE242

Liang ZHU,Yishan LOU,Jianzhong SHEN, et al. Distribution rule of formation anti-drillability parameters in shale gas block of Nanchuan and its application[J]. Reservoir Evaluation and Development, 2019, 9(5): 84-88.

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References 18

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序号	深度/m	层位	直径/mm	长度/mm	质量/g	密度/（g·cm^-3）	抗压强度/MPa
1	2 708.85	龙马溪组	25.00	54.52	72.018	2.691	37.90
2	3 401.91	龙马溪组	24.92	39.96	52.233	2.663	54.00
3	3 437.70	龙马溪组	24.96	56.24	73.635	2.667	37.25
4	3 798.67	龙马溪组	25.02	44.94	58.138	2.635	19.73
5	3 798.67	龙马溪组	25.00	49.52	63.359	2.606	18.56

序号	井深/m	层位	声波时差/（μs·m^-1）	硬度/MPa	可钻性级值
1	3 326.68	龙马溪组	234.28	574.27	5.79
2	3 401.91	龙马溪组	230.41	661.66	6.16
3	3 437.70	龙马溪组	217.26	936.31	6.55
4	3 462.68	龙马溪组	226.48	836.43	6.16
5	3 798.67	龙马溪组	210.07	917.58	6.53
6	3 836.73	龙马溪组	230.12	764.65	5.86
7	2 632.55	龙马溪组	238.65	555.54	5.61

地层	单轴抗压强度/ MPa	岩石可钻性级值	岩石硬度/ MPa
飞仙关组	21.23 ~ 31.39	5.68 ~ 6.30	1 314.73 ~ 1 842.53
长兴组	28.29 ~ 34.89	6.10 ~ 6.45	1 675.23 ~ 2 005.31
龙潭组	17.48 ~ 44.71	5.25 ~ 6.80	1 058.96 ~ 2 419.39
茅口组	36.96 ~ 50.28	6.41 ~ 6.93	2 021.18 ~ 2 598.48
栖霞组	35.75 ~ 47.69	6.44 ~ 6.89	2 009.35 ~ 2 446.16
梁山组	25.62 ~ 36.73	5.73 ~ 6.35	1 361.52 ~ 1 883.64
韩家店组	16.38 ~ 24.53	5.23 ~ 5.82	950.50 ~ 1 384.71
小河坝组	19.59 ~ 26.66	5.64 ~ 6.35	1 108.91 ~ 1 452.40
龙马溪组	20.20 ~ 24.87	5.48 ~ 5.98	1 114.78 ~ 1 546.40

Distribution rule of formation anti-drillability parameters in shale gas block of Nanchuan and its application

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