Method for improving polymer flooding effect, a polymer flooding composition and its application
A technology of polymer and polymer flooding, applied in the field of improving polymer flooding effect and polymer flooding composition, can solve the problems of large adsorption loss, low saturation and limited gel forming effect, so as to improve the comprehensive effect and improve the utilization efficiency. Effect
Active Publication Date: 2021-12-10
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
However, both methods have certain defects: if a cross-linking agent is added, due to the chromatographic separation effect between the cross-linking agent and polymer macromolecules, the actual gelation effect in the deep formation is limited, and it is difficult to achieve effective retention in the destination layer. ; If cationic polymer is added, since the formation itself is negatively charged, the cationic polymer will inevitably have adsorption between the formation, and the adsorption loss will be huge in the process of mass transfer to the deep formation, and there will also be a negative impact on the oil displacement polymer in the deep formation. The problem of limited capture capacity
As time goes by, the remaining oil saturation near the wellbore becomes lower and lower. It is difficult for these two methods to really improve the retention capacity of polymer molecules in deep formations, resulting in poorer and worse implementation effects.
Method used
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Embodiment 1
[0029] The core-shell microgel was prepared according to the method disclosed in Chinese Patent Application No. 200510107824.X, such as the method disclosed in Example 3 thereof.
[0030] In the room, a three-layer heterogeneous pressing model of 4.5cm×4.5cm×30cm (low permeability 0.75μm 2 / Medium penetration 2μm 2 / hypertonic 6μm 2 ), according to the commonly used method in the field, inject 0.1PV of the prepared core-shell microgel and 0.2PV of anionic polyacrylamide into the rock core in an alternate injection mode, specifically injecting 0.1PV of the core-shell microgel first , and then inject 0.2PV anionic polyacrylamide.
Embodiment 2
[0032] The difference between this example and Example 1 is that the core-shell microgel and anionic polyacrylamide are mixed and then injected into the rock core in a manner of simultaneous injection.
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A method for improving polymer flooding effect, the method comprises injecting core-shell microgel and polymer at a volume ratio of 1:100 to 1:1 during the polymer flooding process. Using the method for improving the effect of polymer flooding in this application can increase the retention of polymer molecules in deep formations, control the intrusion of polymer solutions, and improve the utilization efficiency of polymers; without increasing the cost of polymer flooding, improve the polymer flooding combined effect of drive.
Description
technical field [0001] The present application relates to but not limited to the technical field of polymer flooding oil recovery, and particularly relates to but not limited to a method for improving polymer flooding effect, a polymer flooding composition and its application. Background technique [0002] Polymer flooding has achieved huge economic and social benefits since it was popularized and implemented in my country's main land and offshore oil fields in the 1990s, and has become one of the main technologies for enhancing oil recovery at home and abroad. The key to the successful implementation of polymer flooding is to increase the retention of polymer molecules in the ground, especially the retention of movable oil areas in deep formations, increase the displacement resistance of the displacement fluid, and start water flooding without affecting pores. However, due to the heterogeneity of the formation and the influence of the dominant seepage channel formed by the ...
Claims
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IPC IPC(8): C09K8/588
CPCC09K8/588
Inventor 铁磊磊李翔陈月飞刘文辉刘丰钢鞠野徐国瑞郭宏峰
Owner CHINA NAT OFFSHORE OIL CORP