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Injection process for polymer solution with special seepage characteristic

A polymer solution and seepage technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high polymer cost, low polymer dosage, and blockage of pores, saving development costs, injecting The effect of high pressure and low injection pressure

Active Publication Date: 2009-05-20
北京东晟世纪科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polymer flooding in low-permeability reservoirs is still in the exploration and test stage, the amount of polymer used is small, and 500×10 4 ~1000×10 4 The cost of polymer is higher, and the direct use of 1500×10 4 ~3500×10 4 The polymer will block the pores again, making injection difficult

Method used

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  • Injection process for polymer solution with special seepage characteristic
  • Injection process for polymer solution with special seepage characteristic
  • Injection process for polymer solution with special seepage characteristic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1. After mixing 1.5 grams of partially hydrolyzed polyacrylamide, 5 grams of NaCl and 993.5 grams of sewage on the ground, they were injected into rock cores.

Embodiment 2

[0026] Example 2, 1 gram of partially hydrolyzed polyacrylamide, CaCl 2 0.3 grams and 998.7 grams of sewage were mixed on the ground and injected into the core.

Embodiment 3

[0027] Example 3, 0.5 grams of partially hydrolyzed polyacrylamide, MgCl 2 1.5 grams and 998 grams of sewage were mixed on the ground and injected into the core.

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Abstract

This invention relates to a polymer solution with a special seepage property and its preparation method characterizing in including the following components matched in mass percentage: partial hydrolyzed PAA: 0.05-0.15%, mineralization regulator: 0.02-0.5% and rest is water.

Description

Technical field: [0001] The invention relates to an auxiliary agent for oil flooding in an oil field, which is mainly used for polymer flooding in medium and low permeability sandstone reservoirs, in particular to a polymer solution with special seepage characteristics and a preparation method thereof. Background technique: [0002] At present, the eastern oilfields in China have entered the middle and late stage of ultra-high water cut development, and the task of "controlling water and stabilizing oil" is very arduous. In recent years, through the application of polymer flooding technology, the trend of excessively fast rise of oilfield comprehensive water cut has been effectively suppressed, the decline rate of crude oil production has been significantly reduced, and good economic and social benefits have been achieved. With the continuous expansion of the application scale of polymer flooding technology in oil fields, the number of remaining main oil layers that can be u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
Inventor 卢祥国
Owner 北京东晟世纪科技有限公司
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