BZ油田注水井调剖酸化联作体系研究

Abstract

Abstract:

Due to the heterogeneity of the formation of injection wells in BZ oilfield, the single acidification and profile adjustment were impossible to increase the injection and decrease the interlayer contradiction simultaneously. So we studied the combined acidification and profile control system indoors. The supporting acid solution system was one-step acid solution system, and its performance such as retarding speed, inhibiting secondary precipitation, dissolution and compatibility were evaluated experimentally. And then, we obtained that the permeability recovery was good after single core acidizing. The main agent of profile control agent system is anionic polymer, and its acid resistance and core plugging ability were evaluated. A double-core clamping flow test device was used to simulate the non-homogeneous layerss and analyze the influence of the injection sequence of the profile control and acidizing on the combined treatment effect. The simulation results showed that the acidification effect after profile adjustment was obvious, the permeability improvement ratio of low permeability core was 1.52, the permeability improvement ratio of high permeability core was blocked, and the permeability improvement ratio was 0.29. The goal of starting low permeability core by reducing the permeability difference between layers was realized.

Key words: injection well, heterogeneous, profile control, acidification, plugging, combination process

CLC Number:

TE357

PingLi Liu,Fengchao Zhang,Shang Gao, et al. Study on combined system of profile control and acidification of injection wells in BZ oilfield[J]. Reservoir Evaluation and Development, 2019, 9(2): 60-64.

Figures/Tables 10

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References 8

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pH	配套酸液螯合能力/（mg·g^-1）			土酸螯合能力/（mg·g^-1）
pH	Ca	Mg	Fe	Ca	Mg	Fe
1	521	185	460	0.25	0.13	0.30
3	544	188	463
5	560	190	440
7	582	180	470
9	585	184	460

时间/min	注入压力/MPa	时间/min	注入压力/MPa
0（突破）	13.5	35	10.8
5	12.6	40	10.2
10	11.3	45	9.8
15	11.1	50	9.9
20	10.4	55	10.1
25	10.3	60	10.2
30	10.6

实验组	岩心编号	流速/（mL·s^-1)					岩心改善倍比
实验组	岩心编号	基液	酸液	基液	酸液	基液	岩心改善倍比
1组调—解	1（高渗）	0.173	0.273	0.276	调堵	0.039	0.22
1组调—解	2（低渗）	0.102	0.126	0.128	调堵	0.092	0.9
2组解—调	3（高渗）	0.189	调堵	0.018	0.053	0.056	0.29
2组解—调	4（低渗）	0.067	调堵	0.052	0.093	0.102	1.52

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Study on combined system of profile control and acidification of injection wells in BZ oilfield

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