多元热流体多轮次吞吐周期注入强度优化方法

Abstract

Abstract:

As one of the offshore heavy oil thermal exploitation technology, the multi thermal fluid stimulation technology had been carried out in the development of heavy oil in Bohai oilfield. By the theoretical analysis and numerical simulation method, we reasonably characterized the mechanism of multi thermal fluid huff and puff, introduced the concept of coefficient of variation, and obtained the main factors affecting the effect of multiple rounds of throughput, which were the injection strength, shift opportunity, injection temperature, and periodic increasing rate. Based on the reservoir characteristics of the typical oil field, and with the evaluation index of the rate of cycle output and input, we got the sample data of different cumulative oil production and gas retention conditions, and regressed the optimum injection strength in multiple cycles of multi thermal fluid huff and puff wells. Then we corrected the optimization by using the main factors influencing the thermal recovery effect, drew the optimized version to obtain the reasonable injection parameters accurately and efficiently, and improved the thermal recovery effect of huff and puff in multiple rounds.

Key words: multi thermal fluid, huff and puff in multiple rounds, influencing factor, parameter optimization, development effect

CLC Number:

TE357

Feng Xiang,Gong Ruxiang,Li Jinsong. Optimization method for injection intensity of multi thermal fluid huff and puff in multiple cycles[J].Reservoir Evaluation and Development, 2019, 9(1): 64-67.

Figures/Tables 9

Table 1

Fig. 1

Table 2

Table 3

Fig. 2

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Fig. 3

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Table 6

References 8

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影响因素	取值范围	C_v （变异系数）
注入强度/（m³·m^-1）	10~20	0.061 9
注入速度/（m³·d^-1）	95~235	0.002 5
井底注入温度/℃	200~280	0.020 4
焖井时间/d	3~11	0.003 9
产液速度/（m³·d^-1）	90~210	0.002 4
转周时机/（m³·d^-1）	30~46	0.033 4
周期递增率,%	0~20	0.011 6

水平	1	2	3	4	5	6	7	8	9
取值	9.8	10.4	11.0	11.6	12.2	12.8	13.4	14.0	14.6
水平	10	11	12	13	14	15	16	17	18
取值	15.2	15.8	16.4	17.0	17.6	18.2	18.8	19.4	20.0

渗透率/10^-3μm²	最优注入强度/（m³·m^-1）	基础方案最优注入强度/（m³·m^-1）	校正系数
1 000	11.9	14.7	0.811
2 000	13.1		0.889
4 000	14.7		1.000
6 000	15.4		1.046
8 000	15.6		1.061
10 000	15.8		1.073

井名	第一周期累产油/10⁴m³	存气率, %	基础图版优化注入强度/（m³·m^-1）
B4h	2.801 2	62	14.8
B6m	3.388 5	63	15.3
B4ah	1.245 5	55	14.3
B3h	2.730 7	65	14.8

井名	渗透率		油层厚度		原油黏度		水平井长度		优化注入强度/（m³·m^-1）	模型优化注入强度/ （m³·m^-1）	误差, %
井名	取值/10^-3μm²	校正系数	取值/ m	校正系数	取值/（mPa·s）	校正系数	取值/m	校正系数	优化注入强度/（m³·m^-1）	模型优化注入强度/ （m³·m^-1）	误差, %
B4h	3 500	0.972	12	1.163	665	1.007	191	1.138	19.2	20.3	6
B6m	3 600	0.978	6	1.000	449	0.977	276	0.988	14.4	14.0	3
B4ah	3 400	0.967	6	1.000	666	1.007	199	1.058	14.7	15.3	4
B3h	4 500	1.012	8	1.059	449	0.977	163	1.188	18.4	19.7	7

Optimization method for injection intensity of multi thermal fluid huff and puff in multiple cycles

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