注水井解调联作选井选层方法研究与应用

Abstract

Abstract:

The acidizing-water shutoff joint operation technology is an effective method to resolve the plugging, control the water injection profile, and improve the injection effect of the damaged injection wells with the strong heterogeneity. There are many factors affecting the effectiveness of the acidizing-water shutoff joint operation. Due to the complex nonlinear relations of the various factors, the traditional statistical methods is limited. To solve this problem, and based on the analysis of the effect of the acidizing-water shutoff joint operation for the water injection wells, we calculate the correlation coefficients between the factors and the increasing injection ratio by the pearson correlation coefficient method. And according to the correlation coefficient, the relative importance of each factor is determined. Then, the weight of each factor is decided by the fuzzy analytical hierarchy process. This new method is used to calculate the injection wells in the Bohai Oilfield, and the decision value is consistent with the results of the field operation. This method is reliable and simples and provide the powerful guarantee for improving the success rate of acidizing-water shutoff joint operation for injection wells.

Key words: acidizing-water shutoff joint operation, Well and layer selection, correlation coefficient, hierarchical analysis

CLC Number:

TE357

Liqiang Zhao,Chao Xian,Zhifeng Luo, et al. Research and application of candidate injection well and layer selection method for acidizing-water shutoff joint operation[J]. Reservoir Evaluation and Development, 2018, 8(1): 54-57.

Figures/Tables 6

Table1

Scale of improtance"

标度	定义	说明	对应相关系数
0.5	同等重要	两元素相比,同等重要	[0,0.2]
0.6	稍微重要	两元素相比,一元素比另一元素稍微重要	[0.2,0.4]
0.7	明显重要	两元素相比,一元素比另一元素明显重要	[0.4,0.6]
0.8	重要得多	两元素相比,一元素比另一元素重要得多	[0.6,0.8]
0.9	极端重要	两元素相比,一元素比另一元素极端重要	[0.8,1]
0.1,0.2,0.3,0.4	反比较	若元素 $a i$ 比 $a j$ 得到判断矩阵 $r ij$ ,则元素 $a j$ 比 $a i$ 得到判断矩阵 $r ji$ =1- $r ij$ 。

Table1

Table2

Characteristic data of 12 wells"

井号	H/m	$K ?$ /10^-3μm²	$K V$	$J ?$	$W ?$	$W V$	LT	Unp	WCUT	QZ	$I w$	S	P
A1	22.3	418.1	0.6	1.8	0.3	0.3	0.3	0.8	0.7	0.2	0.8	10.0	0.4
A2	47.1	1 279.7	1.0	1.4	0.3	0.7	0.4	0.8	0.4	0.8	0.8	12.0	5.2
A3	33.3	785.4	1.0	1.2	0.5	1.0	0.8	0.8	0.3	0.2	1.0	38.0	10
A4	44.3	1 875.4	0.8	0.5	0.5	0.6	0.4	0.7	0.4	0.2	0.5	22.0	2.5
A5	40.0	886.0	0.7	1.5	0.4	0.8	0.4	0.6	0.5	0.0	0.6	12.0	0.5
A6	40.9	642.3	0.9	1.3	0.4	1.0	0.6	0.8	0.9	0.5	0.4	29.0	10
A7	12.7	283.2	0.9	1.3	0.7	0.5	0.7	0.7	0.0	0.1	0.4	8.0	1.8
A8	47.1	1 279.7	1.0	0.9	0.3	0.7	0.5	0.8	0.7	0.4	0.5	14.0	5.8
A9	40.9	642.3	0.9	1.4	0.4	0.5	0.6	0.8	0.9	0.3	0.4	15.0	5.1
A10	5.1	288.6	0.4	1.2	0.3	0.3	0.4	0.6	0.4	0.8	0.7	38	0.5
A11	28.3	1080.9	0.6	1.5	0.4	1.0	0.7	0.6	0.5	0.5	0.4	15	2.8
A12	21.8	867.9	0.7	1.3	0.5	0.6	0.6	0.7	0.5	0.3	0.6	18	2.6

Table2

Table 3

Correlation between influence factors and augmented injection ratio"

因素	H	$K ?$	$K V$	$J ?$	$W ?$	$W V$	LT	Unp	WCUT	QZ	$I w$	S
相关系数	0.33	0.01	0.74	0.19	0.01	0.79	0.67	0.69	0.25	0.42	0.16	0.86

Table 3

Table4

Weight of well selection factors in break down joint with profile control"

因素	H	$K$	$K V$	$J ?$	$W ?$	$W V$	LT	Unp	WCUT	QZ	$I w$	S
权重	0.075	0.058	0.108	0.058	0.058	0.075	0.108	0.108	0.075	0.092	0.058	0.125

Table4

Table 5

Fig. 1

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Research and application of candidate injection well and layer selection method for acidizing-water shutoff joint operation

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