地质力学在永川深层页岩气开发中的应用

doi:10.13809/j.cnki.cn32-1825/te.2021.01.010

Abstract

Abstract:

Yongchuan deep mountain shale gas block is located in Huayingshan fold belt, which is a low anticline group with broom like spreading to the south. The structural folds are strong and the faults are developed. The target layer of Longmaxi Formation has the characteristics of great difference in burial depth, high ground pressure and ground temperature and large difference in horizontal stress, while the crossing layer has strong abrasiveness, easy instability of well wall and poor drillability. The lack of early geological knowledge leads to low drilling time, long construction period and frequent complex situations, and the fracturing effect of multiple wells is not ideal. In order to solve the main problems faced by Yongchuan work area, researches on the geomechanical parameters, such as drillability, hardness, abrasiveness laboratory experiments, drillability profile establishment, formation three pressure prediction, 3D in-situ stress finite element, simulation and fracture propagation simulation under different horizontal stress difference modes, and horizontal well geological engineering double sweet spot prediction, have been conducted respectively. The results show that the formation drillability level is high, the safe drilling fluid density window is narrow, the difference of in-situ stress direction is large, and the formation of hydraulic fracturing network is affected by high stress difference. Based on the research results of geomechanics, the engineering technology has been adjusted. The drilling speed and fracturing production increase effect are obvious, which has reference significance for the development of deep shale gas in South Sichuan.

Key words: deep shale gas, geomechanics, process adjustment, drilling acceleration, fracturing stimulation

CLC Number:

TE37

Long Zhangliang,Zhong Jingmin,Hu Yongzhang,Wen Zhentao,Li Hui,Zeng Xianwei. Application of geomechanics in deep shale gas development in Yongchuan[J].Reservoir Evaluation and Development, 2021, 11(1): 72-80.

Figures/Tables 11

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References 21

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参数	永川工区
参数	北部向斜	南部向斜	中部背斜
优质页岩埋深（m）	4 061 ~ 4 120	3 843 ~ 4 101	3 080 ~ 3 141
优质页岩厚度（m）	32	36	46.3
地层倾角（°）	0.2 ~ 4.7	1.6 ~ 3.0	3.0 ~ 40.0
断层发育情况	不发育	较发育	发育
岩心裂缝数（条）	105	135	362
孔隙度（%）	5.48	5.42	4.49
总有机碳,TOC（%）	3.09	3.12	3.12
含气量（m³/t）	7.53	7.43	7.73
脆性矿物含量（%）	61.35	60.55	62.13
黏土含量（%）	33.79	35.20	29.40
地层压力梯度（MPa/m）	0.016	0.016	0.015
地应力模式	σ_H>σ_v>σ_h	σ_H>σ_v>σ_h	σ_H>σ_v>σ_h
弹性模量（GPa）	21.73	31.60	26.53
泊松比	0.221	0.223	0.265
抗压强度（MPa）	201.80	157.75	125.94
抗张强度（MPa）	2.36	10.50	8.79
水平应力差（MPa）	15.09	11.50	15.92
断裂韧性（MPa·m^0.5）	0.519	0.429	0.672

钻头	平均微钻时
钻头	地面条件	地层条件
牙轮钻头	30.66	461.37
PDC钻头	153.76	75.00

地层	岩性	地层属性	抗压强度（MPa）	抗剪强度（MPa）	抗剪强度标准偏差（MPa）	可钻性级值	研磨性级别	硬度（MPa）	推荐PDC 钻头类型
自流井组	砂、泥、页、灰岩	中硬	103.87	28.33	1.18	4.40	5.77	816	M323,M423
须家河组	砂、页岩夹煤层	中硬	106.42	28.97	1.08	4.90	6.56	939	M323,M423
嘉陵江组	白云岩、灰岩	中硬	129.12	34.31	1.37	7.68	2.96	1 863	M323,M423
飞仙关组	泥质灰岩	中硬	108.75	29.61	1.96	5.29	1.83	1 070	M323,M423
长兴组	灰岩	中硬	122.10	32.75	1.64	7.02	2.63	1 623	M323,M423
龙潭组	泥、页岩、煤	中软	91.94	25.82	1.74	2.75	0.81	430	M223
茅口组	生屑灰岩	中硬	123.68	33.05	1.80	7.10	2.67	1 654	M323,M423
栖霞组	灰岩	中硬	130.61	34.61	1.19	7.88	3.05	1 931	M323,M423
石牛栏组	泥质灰岩	中等	103.23	27.89	0.58	3.99	1.25	678	M322,M323
龙马溪组	页岩	中等	107.53	28.44	0.50	3.67	1.12	597	M322,M323

Application of geomechanics in deep shale gas development in Yongchuan

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