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A medium and high temperature resistant biological profile control and water shutoff agent for oilfield development

A profile control water shutoff agent, medium and high temperature technology, applied in the direction of drilling composition, earthwork drilling, wellbore/well parts, etc., can solve the problems of inability to inject, hinder the injection of material liquid, etc., achieve strength improvement and cost reduction The effect of low and stable fluidity

Active Publication Date: 2017-08-25
ANJIEYU BEIJING OILFIELD TECHNICAL SERVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of the gel properties of Kedelan, there are obvious shortcomings in practical application, mainly related to the need for construction technology, when the temperature at the wellhead of the injection well group formation and the transition layer are higher than 65°C-90°C, Kedelan The viscosity of the system will increase by more than 5000mpa s in a short period of time (less than 30min), and even form a solid gel, which will lead to the early appearance of gel solid during the injection process, hindering the deeper injection of the material liquid and even causing the subsequent slug to fail to inject

Method used

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  • A medium and high temperature resistant biological profile control and water shutoff agent for oilfield development
  • A medium and high temperature resistant biological profile control and water shutoff agent for oilfield development
  • A medium and high temperature resistant biological profile control and water shutoff agent for oilfield development

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of medium and high temperature resistant biological profile control and water shutoff agent for oilfield development:

[0033] Compound the microbial polysaccharide basic profile control agent and delay gel agent at a mass ratio of 5:2, mix evenly, and dissolve in water to make a solution. In the solution, the microbial polysaccharide basic profile control agent and delay gel agent account for the solution The weight-to-volume ratio is 7% (that is, the quality of the microbial polysaccharide basic profile control agent and the delay gel agent in the solution after every 100ml compounding is 7g); Water blocking agent.

[0034] Among them, the microbial polysaccharide basic profile control agent is compounded by curdlan gum and hydrogen bonding force promoter (potassium chloride) at a weight ratio of 20:1.5; the delayed gelling agent is glycerol.

[0035] The profile control water blocking agent prepared in this example was placed at 70°C for more than 48...

Embodiment 2

[0044] (1) Preparation of medium and high temperature resistant biological profile control and water shutoff agent for oilfield development:

[0045]The microbial polysaccharide basic profile control agent and delayed gel agent are compounded at a mass ratio of 11:0.1, mixed evenly, and dissolved in water to make a solution. In the solution, the microbial polysaccharide basic profile control agent and delayed gel agent account for the solution. The weight-to-volume ratio is 11.1%, which means that the profile control and water shutoff agent with high salinity and high temperature resistance can be used in oilfield development.

[0046] Among them, the microbial polysaccharide basic profile control agent is made of curdlan gum and coagulant (ammonium nitrate) in a weight ratio of 2:1; the delay gel agent is an anionic hydrolyzed polyacrylamide with a molecular weight of 12 million and a hydrolysis degree of 40%.

[0047] The profile control water blocking agent prepared in thi...

Embodiment 3

[0055] (1) Preparation of medium and high temperature resistant biological profile control and water shutoff agent for oilfield development:

[0056] The microbial polysaccharide basic profile control agent and delayed gel agent are compounded at a mass ratio of 6.5:0.01, mixed evenly, and dissolved in water to make a solution. In the solution, the microbial polysaccharide basic profile control agent and delayed gel agent account for the solution. The weight-to-volume ratio is 6.51%, which means that the profile control and water shutoff agent with high salinity and high temperature resistance can be used in oilfield development.

[0057] Among them, the microbial polysaccharide basic profile control agent is compounded by curdlan gum and a hydrogen bond accelerator (potassium chloride) at a weight ratio of 10:1; the delayed gelling agent is an anionic hydrolyzed polyacrylamide with a molecular weight of 3600 million, the degree of hydrolysis is 50%.

[0058] The profile cont...

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Abstract

The invention discloses a medium-high temperature-resistant biological profile control and water shutoff agent for oil field development, which consists of a microbial polysaccharide basic profile control agent and a delayed gelling agent; the microbial polysaccharide basic profile control water shutoff agent is microbial polysaccharide available Colloid compounded hydrogen bond bonding strength accelerator or microbial polysaccharide curdlan gum and coagulant; the delayed gelling agent is one or any of polyol, high molecular polymer hydrolyzed polyacrylamide, gluconate Several kinds. The invention also discloses a preparation method of the biological profile control water blocking agent. The profile control and water shutoff agent of the present invention can maintain the fluidity of the system at medium and high temperature (65°C-90°C), and the viscosity increases slowly, so that it can meet the requirement of smooth transportation to a specific depth underground.

Description

technical field [0001] The invention relates to a medium and high temperature resistant biological profile control and water shutoff agent for oilfield development. Background technique [0002] Curdlan gum is a microbial polysaccharide, which has the characteristic of forming high-strength irreversible gel at high temperature (above 80°C), so it is widely used in food and other industries. Curdlan gum can significantly improve product quality and improve product quality. Water holding capacity, viscoelasticity, stability, and thickening effect to make the taste better. [0003] In oil production, the development of new profile control and water shutoff agents is an important means to enhance oil recovery and economic benefits. A few key points to consider. In the original Kederan high-temperature plugging control system, firstly, it is stirred and dispersed at normal surface temperature and mixed in water, and then injected into the operating water well or oil well. After...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514E21B33/13
CPCC09K8/514E21B33/13C09K8/508
Inventor 严希海赵娜刘松纪春宁严谨
Owner ANJIEYU BEIJING OILFIELD TECHNICAL SERVICES CO LTD
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