Countermeasures Against Inter-bedded Barriers in SAGD Process

Abstract

Abstract:

Inter-bedded barriers sandwiched in heavy oil reservoirs have impacts on steam assisted gravity drainage (SAGD) performance. In the real SAGD operation, the impacts must be taken into full consideration and effective countermeasures against barriers must be studied to improve the SAGD oil production rate. In this paper, features of deformation of barrier rock under high temperature and high pressure conditions in the SAGD process were studied by coupled geomechanical numerical simulations with parameters gained from geomechanical tests of barrier rocks. The permeability of the barrier and the injection pressure of SAGD were determined to be main factors affecting the oil production rate of SAGD. Furthermore, two types of countermeasures against inter-bedded barriers, namely increasing injection pressure and vertical well assisted, were proposed, with characteristics of barriers and operational feasibility being taken into account together. And technical limitation and corresponding operation effect of each countermeasure were also provided. The results have an important guiding significance to the realization of economic and efficient development in SAGD process.

Key words: steam assisted gravity drainage (SAGD), inter-bedded barrier, deformation, coupling, countermeasure

CLC Number:

TE345

SHI Lanxiang, LI Xiuluan, MA Desheng, LIU Pengcheng. Countermeasures Against Inter-bedded Barriers in SAGD Process[J]. Geoscience, 2017, 31(05): 1079-1087.

Figures/Tables 16

References 22

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岩石类型	弹性模量/GPa	泊松比	内摩擦角/(°)	内聚力/MPa	热膨胀系数/(10^-5/℃)
泥质夹层	1.11~4.67	0.02~0.46	8.04~16.6	1.74~3.29	0.8~3
钙质夹层	7.82~43.68	0.02~0.2	49.8~53.89	12.06~16.64	1.1~6
砂岩	0.1~2.0	0.3~0.425	40~50.4	0.062~1	1.4~4

岩石类型	弹性模量/GPa	泊松比	内摩擦角/(°)	内聚力/MPa	热膨胀系数/(10^-5/℃)
泥质夹层	1.11~4.67	0.02~0.46	8.04~16.6	1.74~3.29	0.8~3
钙质夹层	7.82~43.68	0.02~0.2	49.8~53.89	12.06~16.64	1.1~6
砂岩	0.1~2.0	0.3~0.425	40~50.4	0.062~1	1.4~4

敏感性参数	参数值	最大渗透率/ 10^-3 μm²	相对于未耦合情况下的累积产量提高比例/%	敏感性参数	参数值	最大渗透率/ 10^-3 μm²	相对于未耦合情况下的累积产量提高比例/%
弹性模量/ GPa	0.21	26	16.1	初始渗透率/ 10^-3 μm²	1	3.1	10.8
	2.1	39	17.4		10	31	17.4
	21	31	15.5		100	295	28.3
泊松比	0.2	29	16.7	C_n值	25	21	17.4
	0.3	31	17.4		50	96	34.9
	0.4	36	18.8		100	728	71.6
内摩擦角/(°)	10	29	16.2	热膨胀系数/ (10^-5/℃)	2	14	10.4
	20	31	17.4		4	20	12.1
	30	35	18.7		6	31	17.4
内聚力/MPa	0.5	24	17.4	注汽压力/ MPa	5	26	10.9
	5	29	16.4		6	29	17.7
	15	31	14.8		7	31	17.4

敏感性参数	参数值	最大渗透率/ 10^-3 μm²	相对于未耦合情况下的累积产量提高比例/%	敏感性参数	参数值	最大渗透率/ 10^-3 μm²	相对于未耦合情况下的累积产量提高比例/%
弹性模量/ GPa	0.21	26	16.1	初始渗透率/ 10^-3 μm²	1	3.1	10.8
	2.1	39	17.4		10	31	17.4
	21	31	15.5		100	295	28.3
泊松比	0.2	29	16.7	C_n值	25	21	17.4
	0.3	31	17.4		50	96	34.9
	0.4	36	18.8		100	728	71.6
内摩擦角/(°)	10	29	16.2	热膨胀系数/ (10^-5/℃)	2	14	10.4
	20	31	17.4		4	20	12.1
	30	35	18.7		6	31	17.4
内聚力/MPa	0.5	24	17.4	注汽压力/ MPa	5	26	10.9
	5	29	16.4		6	29	17.7
	15	31	14.8		7	31	17.4

夹层渗透率/ 10^-3 μm²	夹层位置/m	夹层厚度/m	2 500 d SAGD累积产油提高比例/%	是否突破夹层
0.001	注汽井上方3	1	0	否
1	注汽井上方3	1	5.8	是
10	注汽井上方3	1	10.8	是
1	注汽井上方3	2	2.8	否
1	注汽井上方3	3	1.7	否
1	注采井中间	1	0	否
10	注采井中间	1	0	否
100	注采井中间	1	0	否