致密油水平井温度剖面影响规律研究

doi:10.13809/j.cnki.cn32-1825/te.2023.05.015

Abstract

Abstract:

The challenge of reliably predicting temperature profiles in horizontal wells in tight oil reservoirs, coupled with an incomplete understanding of the factors influencing these profiles, has hindered the quantitative interpretation of tight oil horizontal well production using distributed optical fiber technology. To address this issue, a comprehensive model has been developed to estimate temperature profiles in horizontal wells in tight oil reservoirs, accounting for various microthermal effects. The temperature profiles of horizontal wells in tight oil reservoir under different single factors were simulated and analyzed. Then, through orthogonal experiment analysis, it demonstrates that the sensitivity of different factors from strong to weak is production rate, fracture half-length, reservoir permeability, wellbore diameter, horizontal inclination angle, fracture conductivity, and total reservoir thermal conductivity（Q>x_f>K>D>θ>F_CD>K_t）. It is worth noting that fracture half-length and formation permeability emerged as the primary factors influencing the temperature profile of horizontal wells in tight oil reservoirs. The research results provide available basic models and theoretical support for quantitative interpretation of production profile and artificial fracture parameters for horizontal wells in tight oil reservoir.

Key words: temperature profile, influence law, temperature profile prediction model, horizontal well in tight oil reservoir, distributed tempreture sensing（DTS）

CLC Number:

TE355

LUO Hongwen, ZHANG Qin, LI Haitao, XIANG Yuxing, LI Ying, PANG Wei, LIU Chang, YU Hao, WANG Yaning. Influence law of temperature profile for horizontal wells in tight oil reservoirs[J].Petroleum Reservoir Evaluation and Development, 2023, 13(5): 676-685.

Figures/Tables 14

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References 22

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参数类型	参数名称	参数取值
储层参数	储层长度/m	1 500
	储层宽度/m	500
	储层厚度/m	20
	储层中深/m	2 150
	孔隙度/%	15
	水平渗透率/10^-3μm²	12
	垂向渗透率/10^-3μm²	1
	地面温度/℃	20
	地温梯度/(℃ /m)	0.03
	储层温度/℃	80
	地层压力/MPa	20
储层岩石热力学参数	岩石密度/(kg/m³⁾	2 380
	岩石热容/[J/(kg·℃)]	845
	总导热系数/[J/(m·s·℃)]	3.46
井筒参数	水平长度/m	810
	井筒直径/m	0.2
	套管外径/m	0.14
	套管内径/m	0.12
	井壁粗糙度/m	0.001 5
	套管导热系数/[J/(m·s·℃)]	12
	水泥环导热系数/[J/(m·s·℃)]	6.9
流体物性	原油密度/[ kg/m³]	900
	原油黏度/MPa·s	2
	原油热容/[J/(kg·℃)]	2 000
	原油膨胀系数/(10^-4/℃)	4
	原油体积系数/(m³/m³)	1.37
	原油热导率/[W/(m·℃)]	0.14
	地层水密度/[kg/m³]	1 000
	地层水黏度/MPa·s	0.1
	地层水热容/[J/(kg·℃)]	4230
	地层水热膨胀系数/(10^-4/℃)	2
	地层水体积系数/(m³/m³)	1.02

参数类型	参数名称	参数取值
储层参数	储层长度/m	1 000
	储层宽度/m	500
	储层厚度/m	20
	储层中深/m	1 350
	孔隙度/%	15
	水平渗透率/10^-3μm²	20
	垂向渗透率/10^-3μm²	2
	地面温度/℃	20
	地温梯度/(℃ /m)	0.03
	储层温度/℃	80
	地层压力/MPa	20
储层岩石热力学参数	岩石密度/(kg/m³⁾	2 380
	岩石热容/[J/(kg·℃)]	845
	总导热系数/[J/(m·s·℃)]	3.46
井筒参数	水平长度/m	700
	井筒直径/m	0.2
	套管外径/m	0.14
	套管内径/m	0.12
	井壁粗糙度/m	0.001 5
	套管导热系数/[J/(m·s·℃)]	12
	水泥环导热系数/[J/(m·s·℃)]	6.9
流体物性	原油密度/[ kg/m³]	900
	原油黏度/mPa·s	2
	原油热容/[J/(kg·℃)]	2 000
	原油膨胀系数/(10^-4/℃)	4
	原油体积系数/(m³/m³)	1.37
	原油热导率/[W/(m·℃)]	0.14
	地层水密度/[kg/m³]	1 000
	地层水黏度/mPa·s	0.1
	地层水热容/[J/(kg·℃)]	4 230
	地层水热膨胀系数/(10^-4/℃)	2
	地层水体积系数/(m³/m³)	1.02

因素名	Q/（m³/d）	K/10^-3μm²	K_t/[J/(m·s·℃)]	x_f/m	F_CD/（μm²·cm）	D/m	θ/（°）
水平1	18	20	3.0	40	10	0.10	1
水平2	20	30	3.5	60	15	0.15	3
水平3	22	40	4.0	80	20	0.20	5

实验编号	Q	K	K_t	x_f	F_CD	D	θ	平均温度差，℃
实验1	1	1	1	1	1	1	1	0.294
实验2	1	2	2	2	2	2	2	0.287
实验3	1	3	3	3	3	3	3	0.281
实验4	2	1	1	2	2	3	3	0.314
实验5	2	2	2	3	3	1	1	0.341
实验6	2	3	3	1	1	2	2	0.323
实验7	3	1	2	1	3	2	3	0.309
实验8	3	2	3	2	1	3	1	0.271
实验9	3	3	1	3	2	1	2	0.274
实验10	1	1	3	3	2	2	1	0.318
实验11	1	2	1	1	3	3	2	0.261
实验12	1	3	2	2	1	1	3	0.253
实验13	2	1	2	3	1	3	2	0.331
实验14	2	2	3	1	2	1	3	0.315
实验15	2	3	1	2	3	2	1	0.269
实验16	3	1	3	2	3	1	2	0.293
实验17	3	2	1	3	1	2	3	0.369
实验18	3	3	2	1	2	3	1	0.308
均值1	0.302	0.31	0.297	0.282	0.003	0.295	0.307
均值2	0.281	0.307	0.305	0.315	0.295	0.313	0.303
均值3	0.319	0.285	0.3	0.305	0.306	0.290	0.289
极差（R）	0.041	0.030	0.007	0.035	0.011	0.020	0.015

Influence law of temperature profile for horizontal wells in tight oil reservoirs

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