Inorganic boron high-temperature delayed fracturing fluid

A fracturing fluid and inorganic boron technology, applied in the field of fracturing fluid, can solve the problems of large damage to the supporting fracture reservoir, large amount of gel breaker, and great difficulty in gel breaking, so as to improve performance and utilization, reduce damage, The effect of improving the breaking efficiency

Active Publication Date: 2011-06-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. In order to ensure the smooth progress of fracturing construction, most fracturing fluids used in fracturing construction use thickeners with relatively high concentrations. Due to the large content of thickeners in fracturing fluids and the high content of residues after gel breaking, it is difficult to support fractures. and reservoir damage;
[0004] 2. Compared with in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 30m on site 3 Add 2895Kg of water into the container, and slowly add 12.0Kg of hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 30.0Kg of potassium chloride, 15.0Kg of sodium lauryl sulfate, and 30.0Kg of TA -2 high temperature enhancer, 3.0Kg formaldehyde, 15.0KgYS-1 delay agent, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A1. JWL-1 crosslinker is solution A2. During fracturing construction, while pumping solution A1, solution A2 is mixed with solution A1 at the ratio of solution A1:solution A2=100 liters:0.7 liters to form a fracturing fluid.

[0028] The above fracturing fluids are recommended to be used in oil and gas wells where the well temperature is lower than 120°C.

Embodiment 2

[0030] 30m on site 3 Add 2910Kg of water to the container, and slowly add 10.5Kg of hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 30Kg of ammonium chloride, 15Kg of sodium lauryl sulfate, and 30.0Kg of TA-2 Heat-resistant enhancer, 3.0Kg formaldehyde, 1.5Kg YS-1 delay agent, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A1. JWL-1 crosslinker is solution A2. During fracturing construction, while pumping solution A1, mix solution A2 with solution A1 at a volume ratio of solution A1: solution A2 = 100 liters: 1.0 liters to form a fracturing fluid.

[0031] The above fracturing fluids are recommended to be used in oil and gas wells where the well temperature is lower than 110°C.

Embodiment 3

[0033] 30m on site 3 Add 2922Kg of water to the container, and slowly add 12.0Kg of hydroxypropyl guar gum while stirring with a pump or a stirrer, and then add 30.0Kg of potassium chloride, 15.0Kg of sodium lauryl sulfate, and 3.0Kg of TA -2 high temperature enhancer, 3.0Kg formaldehyde, 15.0KgYS-1 delay agent, continue to circulate or stir for 30 minutes, so that the liquid is fully mixed to form solution A1. JWL-1 crosslinker is solution A2. During fracturing construction, while pumping solution A1, mix solution A2 with solution A1 at a ratio of solution A1:solution A2=100 liters:0.8 liters to form a fracturing fluid.

[0034] The above fracturing fluids are recommended to be used in oil and gas wells where the well temperature is lower than 100°C.

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Abstract

The invention relates to inorganic boron high-temperature delayed fracturing fluid. A base fluid system is prepared from the following components in part by weight: 96.5 to 97.9 parts of water, 0.35 to 0.4 part of guar gum and derivatives thereof, 0.1 to 1.0 part of sodium hydroxide and sodium thiosulfate composite, 0.5 part of hydrocarbon emulsifier, alkane sulfonate emulsifier or alkyl sulfate emulsifier, 1.0 part of material consisting of a single component or multiple components including KCl, NH4Cl and cationic quaternary ammonium salt polymer, 0.1 part of formaldehyde, glutaraldehyde ordodecyl benzyl ammonium chloride and 0.05 to 0.5 part of mixture of glycol and sodium hydroxide. The inorganic boron high-temperature delayed fracturing fluid is prepared from 100 parts of the base fluid system and 0.7 to 1.0 part of an inorganic boron compound and borax/boric acid composite added with sodium hydroxide for regulating pH value to greater than 7. The concentration of the guar gum and the concentration of the derivatives of the guar gum are reduced, the broken gum residue is reduced, and thus, the damage of the fracturing fluid to propping fractures and reservoir strata are relieved.

Description

Technical field: [0001] The invention relates to a fracturing fluid used in the fracturing and stimulation process of natural gas wells, specifically a water-based fracturing fluid with guar gum and its derivatives as thickening agent and inorganic boron compound as crosslinking agent. Fracturing fluid. Background technique: [0002] At present, most of the fracturing fluids used when high-temperature liquid systems are required in the fracturing of oil and gas fields are fracturing fluids that use guar gum and its derivatives as thickeners, and organic boron or organic boron and zirconium composites as crosslinking agents. liquid, generally has the following disadvantages: [0003] 1. In order to ensure the smooth progress of fracturing construction, most fracturing fluids used in fracturing construction use thickeners with relatively high concentrations. Due to the large content of thickeners in fracturing fluids and the high content of residues after gel breaking, it is ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 王泽霖杜彪谢璇赵文丁里杨海燕苗林王俊旭万华李强
Owner PETROCHINA CO LTD
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