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Medium-high temperature resistant biological profile modifying/water plugging agent for oilfield exploitation

A profile control and water plugging agent, medium and high temperature technology, applied in the drilling composition, earthwork drilling, wellbore/well components and other directions, can solve the problems of inability to inject, hinder the injection of material and liquid, etc., achieve low cost, expand Scope of application, the effect of reducing the cost of use

Active Publication Date: 2015-04-08
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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  • Medium-high temperature resistant biological profile modifying/water plugging agent for oilfield exploitation
  • Medium-high temperature resistant biological profile modifying/water plugging agent for oilfield exploitation
  • Medium-high temperature resistant biological profile modifying/water plugging agent for oilfield exploitation

Examples

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 modifying / water plugging agent for oilfield exploitation. The medium-high temperature resistant biological profile modifying / water plugging agent consists of a microbial polysaccharide base profile modifying agent and delay gel, wherein the microbial polysaccharide base profile modifying agent is a microbial polysaccharide curdlan compound hydrogen bond binding force accelerant or microbial polysaccharide curdlan and a coagulant aid; the delay gel is one or more of polyhydric alcohol, high-molecular polymer hydrolysis polyacrylamide and gluconate. The invention further discloses a preparation method for the biological profile modifying / water plugging agent. The profile modifying / water plugging agent disclosed by the invention can be used for keeping the mobility of the system at a medium-high temperature (65-90 DEG C); moreover, the viscosity is increased slowly, so that the needs of smoothly conveying the profile modifying / water plugging agent to a special underground depth part are met.

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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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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