砾岩致密油藏直井重复压裂裂缝形态分析

doi:10.13809/j.cnki.cn32-1825/te.2021.05.017

Abstract

Abstract:

Refracturing is currently one of the most used methods to rejuvenate productivity of existing wells in low-permeability reservoirs in China. Different refracturing strategies have been conducted for vertical wells in a tight conglomerate reservoir in the Xinjiang. However, the underlying mechanisms are still unclear. By establishing the geomechanical model, the mechanism model of pore pressure inducing stress change based on the finite element method and the numerical model of unstructured reservoir, the researches on the fracture geometry of refracturing and the effect of different refracturing methods have been carried out. The results are as follows. Compared with the initial fracturing and conventional refracturing, the fracture geometry changes significantly after the volume refracturing. The azimuth of the in-situ stress before and after production does not change significantly, but the changes in pore pressure and in-situ stresses have a great impact on the geometry of hydraulic fractures. For the layers that have been perforated and produced, due to the strong energy loss, the propagation of fracture is more difficult, resulting in short fracture length and wide fracture width. In the case of adding new perforation in un-developed layers, as the formation can provide enough energy, it is easier to propagate fractures. The wells which are at the higher place of the new perforation layers have better productivity after the volume refracturing. The timing of refracturing also has a significant impact on oil production. A proper choice of refracturing time can effectively improve the well productivity.

Key words: refracturing, fracture geometry, numerical simulation, stress field, hydraulic-mechanical coupling, tight conglomerate reservoir

CLC Number:

TE357

Yangyang LEI,Hui WANG,Xin WU, et al. Analysis of fracture geometry for refractured vertical wells in tight conglomerate reservoir[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(5): 782-792.

Figures/Tables 20

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References 23

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参数名	参数值	参数名	参数值
井底流压（MPa）	0.5	50 ℃条件下黏度（mPa·s）	13.33
边界压力（MPa）	6	渗透率（10^-3 μm²）	0.20
杨氏模量（GPa）	30	孔隙比	0.1
泊松比	0.2	裂缝长度（m）	300
滤失系数（m/s）	10~14	裂缝间距（m）	250

井号	井段深度（m）	施工用量
井号	井段深度（m）	70/140目陶粒（m³）	20/40目石英砂（m³）	滑溜水（m³）	原液（m³）	交联剂（m³）	暂堵球（个）
A1	2 841.0~2 900.0	56.6	113.4	3 119.5	990.5	9.9	310
A2	2 815.0~2 910.0	56.5	113.5	3 110.2	990.7	9.9	260
A3	2 823.0~2 847.0	34.4	55.6	2 175.3	640.2	6.4	200
A4	2746.1.0~2983.3	56.6	113.5	3 110.5	991.5	2.6	310

阶段	规模（m³）	裂缝半长（m）	缝高（m）	缝宽（mm）
首次压裂	86.71	41.88	35.57	5.84
普通重复压裂	200.23	45.19	39.01	11.12
体积压裂段1	2 884.14	123.65	95.35	6.74
体积压裂段2	1 360.22	183.04	112.23	1.14

阶段	规模（m³）	裂缝半长（m）	缝高（m）	缝宽（mm）
首次压裂	154.31	50.48	48.95	4.42
普通重复压裂	200.36	39.05	36.02	11.73
体积压裂段1	2 817.74	102.63	85.76	6.84
体积压裂段2	1 285.15	105.23	120.02	3.23

阶段	规模（m³）	裂缝半长（m）	缝高（m）	缝宽（mm）
首次压裂	75.31	38.69	28.45	1.55
体积重复压裂	2 875.25	93.35	110.14	1.51

Analysis of fracture geometry for refractured vertical wells in tight conglomerate reservoir

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阶段	规模（m³）	裂缝半长（m）	缝高（m）	缝宽（mm）
首次压裂	97.28	54.63	25.78	3.37
体积压裂段1	2 857.27	134.06	75.48	4.85
体积压裂段2	1 341.23	159.79	118.35	2.36

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生产年限（a）	半缝长（m）	缝高（m）	缝宽（mm）
1	233.12	112.95	1.12
3	109.17	98.88	2.12
5	134.69	47.93	6.66