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Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof

A fracturing fluid, low-molecular technology, applied in the field of fracturing fluid, can solve problems affecting construction reliability, environmental pollution, and reduce fracturing fluid viscosity, saving water and chemical additives, shortening construction operation time, and stabilizing flow. The effect of changing performance

Inactive Publication Date: 2005-11-23
CHANGQING GASOLINEEUM EXPLORATION BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the fracturing fluid used in the fracturing reconstruction of oil and gas fields is mainly a fracturing fluid with a polymer as a thickening agent, which generally has the following disadvantages: 1. Since a gel breaker must be used in the fracturing fluid , the breaker always reduces the viscosity of the fracturing fluid during the fracturing process, which affects the reliability of the construction
2. The filter cake formed by the fracturing fluid in the formation and the concentrated solution around it cannot break the gel or only partially break the gel, and polymers are likely to remain in the support fractures of the formation, causing serious pollution to the support fractures
3. The fracturing fluid must be flowed back to the ground after the fracturing construction is completed. There are strict requirements at home and abroad for the treatment of the liquid flowed back to the surface. pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0039] 10m on site 3 Add 9900Kg of water to the container, and slowly add 30Kg of low-molecular-weight hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 100Kg of potassium chloride, 10Kg of crude oil demulsifier, and 5Kg of lauryl sulfuric acid Sodium, 3Kg sodium carbonate, 30Kg formaldehyde, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A 1 .

[0040] During fracturing construction, pump solution A 1 At the same time, mix the cross-linking agent with solution A 1 , to solution A 1 : crosslinking agent = 100 liters: 1.5 liters volume ratio mixed to form a fracturing fluid.

[0041] The above fracturing fluids are recommended to be used in oil wells where the well temperature does not exceed 60°C.

specific Embodiment 2

[0042] at 2m 3 Add 900Kg of clear water into the container, and slowly add 100Kg of sodium carbonate under the condition of circulating with a pump or stirring with a stirrer, and make it completely dissolve, and prepare solution B for later use.

[0043] After the fracturing construction in "Concrete Example 1", the liquid flowing back from the formation is filtered and sand-removed and stored in a 10m 3 In the container, let it stand for more than 1 hour to make the oil and water separate automatically, and take the lower layer of aqueous solution C 1 stand-by. During fracturing construction, pump solution C 1 At the same time, press solution B with solution C 1 With solution C 1 : Solution B = 100 liters: 1.0 liters volume ratio and mixed to form a fracturing fluid.

[0044] This fracturing fluid is recommended to be used in oil wells where the well temperature does not exceed 60°C.

specific Embodiment 3

[0045] 10m on site 3 Add 9900Kg of water to the container, and slowly add 35Kg of low-molecular hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 100Kg of potassium chloride, 10Kg of crude oil demulsifier, and 5Kg of lauryl sulfuric acid Sodium, 3Kg sodium carbonate, 30Kg formaldehyde, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A 2 .

[0046] During fracturing construction, pump solution A 2 At the same time, mix the cross-linking agent with solution A 2 With solution A 2 : crosslinking agent = 100 liters: 1.5 liters volume ratio mixed to form a fracturing fluid.

[0047] The above fracturing fluids are recommended to be used in oil wells with a well temperature of 60°C to 80°C.

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Abstract

The invention relates to a low-molecular environmentally-friendly fracturing fluid and use of recovery liquid, wherein the fracturing fluid comprises low molecular thickening agent, cross linking agent, water, pH regulator, crude oil demulsification agent, surface active agent, clay stabilizer and bactericidal agent, thus no glue-breaking agent is needed, and very good rheological property can be achieved.

Description

1. Technical field: [0001] The invention relates to a fracturing fluid used in the fracturing and stimulation process of oil wells or natural gas wells, specifically a low-molecular-weight environment-friendly fracturing fluid that uses low-molecular polymers as thickeners and can be recycled and reused. The application of liquid and its recovery liquid. 2. Background technology: [0002] In the prior art, the fracturing fluid used in the fracturing reconstruction of oil and gas fields is mainly a fracturing fluid with a polymer as a thickening agent, which generally has the following disadvantages: 1. Since a gel breaker must be used in the fracturing fluid , The gel breaker always reduces the viscosity of the fracturing fluid during the fracturing process, which affects the reliability of the construction. 2. The filter cake formed by the fracturing fluid in the formation and the concentrated solution around it cannot break the gel or only partially break the gel, and pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 汪义发谢璇杜彪王俊旭邓卫珍苗林牛俊峰吕莉
Owner CHANGQING GASOLINEEUM EXPLORATION BUREAU
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