Intramolecular Al cross-linked polymer gel and its prepn

A technology of cross-linked polymers and gels, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of poor application effect of cross-linked polymers in mines and the inability to realize "cross-linking reaction" and "cross-linking reaction". Difficulties and other problems, to achieve the effect of good profile control characteristics, large flow resistance and low viscosity
CN1810918AInactive Publication Date: 2006-08-02DAQING GASOLINEEUM INST
0 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DAQING GASOLINEEUM INST
Publication Date
2006-08-02
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The present invention relates to one kind of intramolecular Al3+ cross-linked polymer gel and its preparation process. The gel cross-linking reaction happens mainly between the branch chains inside the identical polymer molecule to form í‹localíŒ netted molecular configuration. The polymer gel has basically unchanged viscosity before and after the gel is formed, and can flow in porous medium with flow resistance obviously greater than that of polymer solution in the same viscosity and residual resistance coefficient greater than the resistance coefficient. The polymer gel features consists of partially hydrolyzed polyacrylamide 0.04-0.08 wt%, aluminum citrate 0.01-0.04 wt%, and NaCl or KCl mineralization degree regulator 0.05-1.0 wt% except oil field sewage. The polymer gel has excellent profile modifying characteristic.
Need to check novelty before this filing date? Find Prior Art

Description

Technical field:

[0001] The invention relates to an auxiliary agent for adjusting the liquid absorption profile of an oil field water injection well or for oil displacement, especially a kind of intramolecular Al 3+ Cross-linked polymer gel and method for its preparation. Background technique:

[0002] With the continuous increase of comprehensive water cut in domestic waterflood development oilfields, how to reduce the inefficient and ineffective circulation of injected water in high permeability layers or large pores, and expand the swept volume of medium and low permeability layers has become a major technical problem in the process of oilfield development . At present, the plugging agent (referred to as profile control agent) commonly used in oilfields to adjust the liquid absorption profile of water injection wells mainly includes Al 3+ 、Cr 3+ Polymer gels and solid particles such as clay, oil well production sludge, fly ash and zeolite as cross-linking agents with c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More