聚驱后综合治理措施增油效果及作用机理研究——以渤海LD10-1油田为例

Abstract

Abstract:

LD10-1 oilfield in Bohai reservoir is a thick reservoir with high average permeability, serious heterogeneity, low cementing strength of rock and high single well injection-production strength. For this reason, during the development of the profile control and oil displacement technology of polymer gel in the early stages, the contradiction between and within layers caused by the polymer retention and scour are obvious. Then we test the development of the comprehensive treatment of the effect screening and performance evaluation, profile control, plug release of modifying and flooding agent, alternative injection of the profile control and oil displacement agent and water after polymer flooding. The results showed that, with the same dosage of the polymer gel, and compared with the whole slug injection method, the gel and water alternating injection method can slow down the speed of the entry profile reversal, and extend the sweep coefficient of the medium and low permeability layer. When they are used together, the utilization level of the medium and low permeability layers is further enhanced, and the effect of oil increasing and precipitation is obvious.

Key words: Bohai Oilfield, early polymer flooding, comprehensive treatment, physical simulation, mechanism study

CLC Number:

TE357

Liu Yigang,Xiao Lihua,Zou Jian,Lu Xiangguo,Yan Dong,Cao Weijia. Study on oil increasing effect and mechanism of comprehensive treatment measures after polymer flooding: Taking LD10-1 oilfield in Bohai Oilfield as an example[J].Reservoir Evaluation and Development, 2018, 8(4): 46-51.

Figures/Tables 8

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References 14

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水型	K⁺+Na⁺	Ca²⁺	Mg²⁺	CO₃^2-	HCO^3-	SO₄^2-	Cl^-	总矿化度
水源水	2 549.84	684	166	0	162	0.11	5 340	8 901.95
污水	1 908.4	111	37.3	0	696	0.39	3 100	5 853.09

方案编号	调驱剂类型	工作黏度/ （mPa·s）	含油饱和度,%	采收率,%
方案编号	调驱剂类型	工作黏度/ （mPa·s）	含油饱和度,%	水驱	最终	增幅
1-1	疏水缔合聚合物溶液	279.8	70.00	27.8	30.8	3.0
1-2	Cr³⁺聚合物凝胶	5.2	71.67	27.1	45.3	18.2
1-3	“高浓”聚合物溶液	18.8	68.75	26.8	42.1	15.3

实验方案	措施类型	含油饱和度,%	采收率,%
实验方案	措施类型	含油饱和度,%	聚驱后	后续措施后	增幅
2-1	凝胶整体段塞	71.67	45.3	65.1	19.8
2-2	凝胶与水交替注入	70.59	45.9	67.7	21.8
2-3	调剖+凝胶与水交替	71.20	44.6	73.4	28.8
2-4	解堵+调剖+凝胶与水交替	70.00	46.1	76.6	30.5

Study on oil increasing effect and mechanism of comprehensive treatment measures after polymer flooding: Taking LD10-1 oilfield in Bohai Oilfield as an example

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