Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for deep profile control using sewage produced by ASP flooding

A ternary composite, deep profile control technology, applied in the field of deep profile control, can solve the problem of large content, achieve efficient treatment and reuse, promote popularization and application, and reduce the cost of sewage treatment equipment and chemicals.

Active Publication Date: 2017-01-11
PETROCHINA CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem that the existing ASP flooding produced water contains a large amount of chemical agents such as polyacrylamide, anionic surfactant, alkali and emulsified oil, the present invention further proposes a method of utilizing the produced sewage of ASP flooding to process deep The method of profile control specifically includes the following technical solutions:

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for deep profile control using sewage produced by ASP flooding
  • A method for deep profile control using sewage produced by ASP flooding
  • A method for deep profile control using sewage produced by ASP flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The corresponding cationic polyelectrolyte selects epichlorohydrin-dimethylamine polycondensate (EPI-DMA), and prepares a certain concentration of aqueous solution, which is added to the sewage produced by the on-site ASP flooding with a HPAM concentration of 800 mg / L, and stirred , the solution gradually becomes turbid, and finally forms a viscoelastic gel profile control agent.

[0042] It can be seen from Table 3 that when the concentration of EPI-DMA (which can be formulated into a solution with a mass concentration of 2% in use) in the ASP flooding wastewater is lower than the critical value of 400 mg / L, the turbidity of the wastewater gradually increases , the Zeta potential gradually shifts positively. When the concentration reaches a critical value, a gel is formed. The concentration continued to rise, and the system did not change much.

[0043] Table 3 Effect of EPI-DMA concentration on the gelation of the system

[0044] Numbering EPI-DMA conce...

Embodiment 2

[0053] The corresponding cationic polyelectrolyte selects epichlorohydrin-dimethylamine condensation polymer (EPI-DMA), and the corresponding additive selects zinc sulfate, and is all made into a certain concentration of solution (the mass concentration of EPI-DMA is 2%, zinc sulfate The addition amount is 150mg / L), and it is added to the HPAM concentration of 800mg / L in the field ASP flooding produced sewage, stirred, the solution gradually becomes turbid, and finally forms a gel profile control agent with viscoelasticity.

[0054] As can be seen from Table 6, when the concentration of HPAM in the sewage is 800mg / L, the EPI-DMA polyelectrolyte of 300mg / L and the ZnSO of 150mg / L are added 4 , can form a gel.

[0055] Table 6 The effect of additives on the gelation of the system

[0056]

[0057] In summary, the present invention re-injects the wastewater produced by ASP flooding into the reservoir formation, and then injects cationic polyelectrolytes to make the cationic p...

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

PUM

No PUM Login to View More

Abstract

The invention provides a method for deep profile control by utilizing ASP (alkaline / surfactant / polymer) combination flooding produced sewage, and belongs to the technical field of oilfield enhanced oil production. The method comprises the following steps that ASP combination flooding produced sewage is injected into an oil deposit stratum, a cationic polyelectrolyte solution is injected into the oil deposit stratum, cationic polyelectrolyte is epoxy chloropropane-amine polycondensate or dimethyl diallyl ammonium chloride polymers, the injection volume of the cationic polyelectrolyte solution accounts for 0.5 percent to 5 percent of the volume of the injected ASP combination flooding produced sewage, and a viscoelastic gel type profile control agent is generated. The method has the advantages that the cationic polyelectrolyte and various chemical agents in the sewage take reactions such as electrical neutralization, flocculation and crosslinking, and the viscoelastic gel type profile control agent is generated, so the oil production increasing and water reduction and the efficient treatment and reutilization of the ASP combination flooding produced sewage are realized through deep profile control on the ASP combination flooding produced sewage, in addition, the cost of sewage treatment equipment and agentia is greatly reduced, and the popularization and the application of an ASP combination flooding technology are promoted.

Description

technical field [0001] The invention relates to a method for deep profile control by using sewage produced by three-element compound flooding, and belongs to the technical field of enhanced oil recovery in oil fields. Background technique [0002] ASP flooding uses a composite system of alkali, surfactant and polyacrylamide as an oil displacement agent, which can greatly increase oil recovery. It is an important tertiary oil recovery technology in the late stage of high water-cut oilfield development. and weak alkali ASP flooding technology have achieved good development results. [0003] However, mine field tests show that, because the sewage produced by ASP flooding contains a large amount of polyacrylamide, anionic surfactant, alkali and emulsified oil, it is very difficult to treat the sewage, and the oil and suspended solids in the sewage often fail to meet the reinjection index. [0004] Table 1 and Table 2 are the follow-up analysis results of the basic properties of...

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

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22C09K8/512
Inventor 刘国良马自俊赵振兴陈文征李芮丽欧阳坚
Owner PETROCHINA CO LTD