Deep plugging agent containing wood dust and gel

A technology of plugging agent and wood chips, which is used in sealing/isolation, wellbore/well components, earth-moving drilling, etc., which can solve the problems of ineffective development of low-permeability parts, large amount of profile control agent, and low pressure gradient.

Inactive Publication Date: 2005-08-17
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: ①The amount of profile control agent is large and the cost is high; ②The bearing strength and residual resistance coefficient are low, and the pressure gradient is low, which cannot guarantee the effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0004] Specific embodiment 1: This embodiment is composed of high molecular weight anionic polyacrylamide with a molecular weight of >19 million and a degree of hydrolysis of 25-30%, phenolic composite polyamine, resorcinol, oxalic acid, wood chips, and water. The percentages are: high molecular weight anionic polyacrylamide with a molecular weight> 19 million and a degree of hydrolysis of 25-30%: 0.15-0.5%, phenolic compound polyamine: 0.1-0.3%, resorcinol: 0.01-0.02%, oxalic acid :0.1~0.2%, sawdust: 0.5~2.5%, water: 99.14~96.48%, formulated into an aqueous solution with a concentration of 0.86~3.52% according to the above weight ratio. The particle size of the wood chips is 0.01-2 mm. The production method of this embodiment is: the high molecular weight anionic polyacrylamide, phenolic composite polyamine, resorcinol, oxalic acid, wood chips and water are loaded into the preparation tank of the plugging agent, and the plugging agent is processed by the wood chip gel. Prepare th...

Example Embodiment

[0005] Specific embodiment 2: This embodiment is composed of high molecular weight anionic polyacrylamide with a molecular weight of> 19 million and a degree of hydrolysis of 25-30%, phenolic composite polyamine, resorcinol, oxalic acid, wood chips and water, and their weight The percentages are: high molecular weight anionic polyacrylamide with a molecular weight of> 19 million and a degree of hydrolysis of 25-30%: 0.15%, phenolic compound polyamine: 0.1%, resorcinol: 0.01%, oxalic acid: 0.1%, sawdust 0.5 %, water 99.14%, and an aqueous solution of plugging agent with a concentration of 0.86% is obtained.

Example Embodiment

[0006] Specific embodiment three: This embodiment is composed of high molecular weight anionic polyacrylamide with a molecular weight of> 19 million and a degree of hydrolysis of 25-30%, phenolic composite polyamine, resorcinol, oxalic acid, wood chips and water, and their weight The percentages are: high molecular weight anionic polyacrylamide with a molecular weight> 19 million and a degree of hydrolysis of 25-30%: 0.15%, phenolic compound polyamine: 0.1%, resorcinol: 0.02%, oxalic acid: 0.2%, wood chips 2.5 %, water 97.03%, and an aqueous solution of plugging agent with a concentration of 2.97% is obtained.

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Abstract

The deep wood chip gel plugging agent is used in water injecting well to plug the high penetrating band in thick oil stratum to lower ineffective water circulation. The deep plugging agent consists of high molecular weight anionic polyacrylamide of molecular weight over 19 million and hydrolysis degree of 25-30 % 0.15-0.5 wt%, phenol compounded polyamine 0.1-0.3 wt%, resorcinol 0.01-0.02 wt%, oxalic acid 0.1-0.2 wt%, wood chip 0.5-2.5 wt% and water 96.48-99.14 wt%, which are compounded into water solution of 0.86-3.52 wt% water solution. The present invention has low use concentration, controllable gel forming time and viscosity, low cost and simple compounding process.

Description

Technical field: [0001] The invention relates to a deep plugging agent for oilfield water injection wells used for plugging high permeability zones of thick oil layers and reducing invalid water circulation. Background technique: [0002] For the heterogeneous sandstone oilfield developed by water flooding, which enters the development stage of ultra-high water cut period, due to serious heterogeneity and long-term scour of injected water, the pore structure and physical parameters of the reservoir will change greatly. High permeability zones or large pores are formed in the oil layer, and the low-efficiency and ineffective circulation of injected fluid along the high-permeability zone becomes more and more serious, which reduces the oil displacement efficiency of injected water and seriously affects the oilfield development benefits. For the problem of low-efficiency and ineffective circulation of injected fluids in thick oil layers and high-permeability zones, research and...

Claims

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Application Information

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IPC IPC(8): E21B33/12
Inventor 王贤君李建阁陈芳王喜峰李国
Owner DAQING OILFIELD CO LTD
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