Method for preparing and using shift drive agent of reversed phase latex of polyacrylamide

A polyacrylamide and inverse emulsion technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as affecting the effect of profile control, increasing costs, separation, etc., to avoid chromatographic separation effects, simple construction, The effect of good temperature

Inactive Publication Date: 2007-07-25
中国石化股份胜利油田分公司孤岛采油厂
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Problems solved by technology

When construction is to be carried out on a water well connected to no polymer injection station, if the polyacrylamide is not fully dissolved, it will affect its gelling time and strength, thereby affecting the profile control effect
Therefore, the polyacrylamide mother liquor can only be transported from the injection station, which undoubtedly increases the cost and affects its popularization and application.
[0007] 2. The gelation time is not easy to control
The conventional gel profile control technology usually adds a cross-linking agent to the polymer solution to make it into a gel. After the two are directly mixed, it is effective for plugging the large pores in the near-wellbore zone of the injection well and adjusting the water absorption profile in the near-wellbore zone. Profile control agents are difficult to inject into deep positions, so they cannot solve the problem of profile control in deep reservoirs, and have no obvious effect on improving oil recovery
[0009] 3. The system is prone to chromatographic separation in the formation

Method used

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preparation example Construction

[0032] A preparation method of polyacrylamide inverse emulsion control and flooding agent, including preparation of organic crosslinking agent, preparation of polyacrylamide inverse emulsion and preparation of polyacrylamide inverse emulsion control and flooding agent:

[0033] a. The crosslinking agent is prepared from phenol and formaldehyde. It is synthesized by two-step catalytic synthesis at a molar ratio of phenol:formaldehyde=1:5. The first stage is reacted at 60°C for 1 hour, and the second stage is at 60°C. React at ~90℃ for 70min, and it will become resol crosslinking agent;

[0034] b. Polyacrylamide inverse emulsion adopts No. 5 white oil as the dispersed phase, and the monomer content in water is controlled at 50-70%; the Span Tween ratio is 9:1, the composite emulsifier is 8%, and the oil-water mass ratio It is 1:1, the pH value of the water phase is 7, and the monomer concentration of the water phase is 45%; add 0.02% redox initiator to adiabatic polymerization to m...

Embodiment 1

[0037] Inverse emulsion control and flooding test of the 5-720 well group of Ng4 unit in Zhongyi District: The Ng4 development unit in Zhongyi District of Gudao Oilfield is located in the main part of Gudao Oilfield, with an oil-bearing area of ​​11.8km 2 , The effective thickness is 14.5m, and the geological reserve is 2857×10 4 t, the main oil layer is Guantao Formation 4 2 , 4 4 Two small layers, 4 2 Except for pin-outs near the wells of Zhong 7-9, Zhong 9-12 and Zhong 11-13 in the southwest, the layers are distributed in other areas, and are connected in large areas, with a geological reserve of 952.8×10 4 t, accounting for 33.7% of the total reserves of the sand group; 4 4 The layer is a typical positive rhythm deposit, distributed almost in the whole area, with a geological reserve of 1171.3×10 4 t, accounting for 62.0% of the total reserves of the sand group. The unit was put into production in September 1971, and was put into water injection development in October 1974. The ...

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Abstract

This invention discloses a method for preparing polyacrylamide reverse phase emulsion profile control agent. The method comprises: preparing organic crosslinker, preparing polyacrylamide reverse phase emulsion, and preparing polyacrylamide reverse phase emulsion profile control agent. When used, 0.8-2% polyacrylamide reverse phase emulsion profile control agent is mixed with 400-3500 mg / L phase-reverse agent and oil field wastewater at 30-45 deg.C, and filled into the oil layer through a water-injection well. The phase-reverse gelation time is 2-15 days, and the gel viscosity is higher than 5000 MPa.s.

Description

1. Technical Field [0001] The invention relates to a gel profile control and flooding technology method suitable for deep profile control and flooding of oil fields, which can improve the recovery of oil fields (especially after polymer flooding), in particular to a polyacrylamide inverse emulsion profile control and flooding agent The preparation and use methods are suitable for high water-cut oil fields, polymer flooding high-over polymer well groups, and post-polymer flooding oilfield control and flooding applications, belonging to the field of petroleum development. 2. Background technology [0002] my country is the country with the highest degree of tertiary oil recovery in the world, and it is also in the forefront of the world in the application of polymer flooding technology. Shengli Oilfield has also been widely promoted in Gudao, Gudong and other oilfields. Since the pilot test of the Gudao Oilfield polymer flooding project started in 1992, there have been 14 polymer i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60
Inventor 曹正权肖建洪陈辉姜娜杨金荣
Owner 中国石化股份胜利油田分公司孤岛采油厂
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