Composite crosslinking deep profile control agent for oil reservoir deep profile control and preparation method thereof

A technology of regulating and displacing agent and compound delivery, which is applied in the field of petroleum industry, can solve the problems of short effective period of formation compatibility, limited application and promotion, etc., and achieve the effect of good application prospect, good injectability, and enhanced freezing strength

Inactive Publication Date: 2013-03-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, the phenolic resin jelly used in field deep regulation and flooding is composed of a polymer and a precondensed novolac resin crosslinking agent. Since the precond

Method used

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  • Composite crosslinking deep profile control agent for oil reservoir deep profile control and preparation method thereof
  • Composite crosslinking deep profile control agent for oil reservoir deep profile control and preparation method thereof
  • Composite crosslinking deep profile control agent for oil reservoir deep profile control and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1. Preparation of composite cross-linked deep water control agent and its process research

[0025] The composite cross-linked deep-seated control and drive agent in this example is made of anionic polyacrylamide (purchased from French SNF), phenolic cross-linking agent, auxiliary agent acetic acid and water, wherein the phenolic cross-linking agent is made of hexamethylene tetra amine and resorcinol, the mass ratio of hexamethylenetetramine and resorcinol is controlled at 2:1, 3:1 or 4:1; The effects of the mass concentration of the polymer, the mass concentration of the cross-linking agent and the mass concentration of the auxiliary agent acetic acid on the freezing time and freezing strength were obtained. Respectively as figure 1 , figure 2 with image 3 shown.

[0026] Depend on Figure 1~Figure 3 It can be known that the preferred mass concentration of each component in the composite cross-linked deep-seating agent of the present invention is: polyme...

Embodiment 2

[0027] Example 2. Gelling Reaction and Crosslinking Mechanism of Composite Crosslinking Deep Control and Displacement Agent

[0028] Taking the flood control agent prepared in Example 1 as an example, its crosslinking mechanism is: the hexamethylenetetramine solution decomposes slowly under acidic conditions at high temperature (35°C~45°C) to produce formaldehyde, and then the formed formaldehyde and m-benzene Diphenol reacts to generate hydroxymethyl resorcinol, and the time is controlled within the range of 30min~60min; formaldehyde, the generated hydroxymethylresorcinol and the amide group of the polymer undergo a crosslinking reaction, and the temperature is controlled at 55°C ~70°C, the time is controlled within the range of 30min~60min, and an elastic jelly with a three-dimensional network structure is formed. Concrete reaction equation is as follows:

[0029] (1) The hexamethylenetetramine solution decomposes under acidic conditions in a high-temperature environment to...

Embodiment 3

[0036] Example 3, performance evaluation of composite cross-linked deep control and drive agent

[0037] Formula: 2000mg·L -1 Polymer+1250mg·L -1 Phenolic crosslinking agent (the mass ratio of hexamethylenetetramine to resorcinol is 4:1) + 1250mg L -1 Auxiliary acetic acid.

[0038] First prepare 5000mg·L -1 Anionic polyacrylamide (purchased from France SNF, molecular weight 19 million) mother liquor, 20000mg L -1 Hexamethylenetetramine solution, 10000mg L -1 Resorcinol solution and 10000mg·L -1 of acetic acid solution. Prepare 75g of composite cross-linking agent to be gelled: 15g of hexamethylenetetramine solution, 3.75g of resorcinol solution and 1.875g of acetic acid solution were reacted at 40°C for 50min to obtain hydroxymethylresorcinol, Then add 30g of polymer solution, react at 60°C for 24 hours, then add water to 75g, stir evenly to obtain a formula of 2000mg·L -1 polymer+1250mg·L -1 Phenolic cross-linking agent+1250mg·L -1 Add acetic acid as an auxiliary a...

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Abstract

The invention discloses a composite crosslinking deep profile control agent for oil reservoir deep profile control and a preparation method thereof. The composite crosslinking deep profile control agent is prepared from a polymer, a phenolic crosslinking agent, an auxiliary agent and water, wherein the auxiliary agent is a pH value regulator, and the concentrations of the polymer, the phenolic crosslinking agent and the auxiliary agent in the composite crosslinking deep profile control agent are 1,500 to 2,000mg/L, 750 to 1,250mg/L and 1,000 to 1,500mg/L in sequence. The preparation method of the composite crosslinking deep profile control agent comprises the steps of preparing the phenolic crosslinking agent and the polymer through crosslinking reactions. By the composite crosslinking deep profile control agent for the oil reservoir deep profile control, along with the rise of the concentration of each component, the gelation time is shortened, the gelation strength is enhanced, and the gelation time is adjustable; and the composite crosslinking deep profile control agent has high injectivity, shearing resistance, thermal stability and plugging performance, is suitable for deep profile control operation processing of an injection well, and has a good application prospect for improving the producible oil index through oil stabilization and water control during later-stage development of a high-water-cut oilfield.

Description

technical field [0001] The invention relates to a composite cross-linked deep control and drive agent for oil reservoir deep control and drive and a preparation method thereof, belonging to the field of petroleum industry. Background technique [0002] As the oilfield enters the late stage of medium and high water cut development, it becomes more and more difficult to stabilize oil and control water. Due to the long-term scouring effect of injected water, coupled with the influence of reservoir depositional environment and heterogeneity, the contradictions between layers and planes have become more and more prominent, and water flow channels have formed between oil and water wells, making it difficult to produce well in low-permeability layers , so that a large amount of remaining oil remains in it, which seriously affects the water flooding development effect of the reservoir. Therefore, deep control and flooding technology has been proposed and applied as an important tec...

Claims

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Application Information

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IPC IPC(8): C09K8/588C08J3/24C08L33/26C08K5/09C08K5/092C08K3/28
Inventor 姜维东张健王业飞何宏薛新生康晓东李强
Owner CHINA NAT OFFSHORE OIL CORP
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