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Low-temperature melon gel fracturing liquid

A fracturing fluid and low-temperature technology, applied in drilling compositions, chemical instruments and methods, etc., to achieve the effects of increasing the rate of gel breaking, preventing the formation of precipitation, and shortening the gel breaking time

Active Publication Date: 2019-11-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the requirements of low-temperature fracturing in the existing fracturing fluid, the amount of ammonium persulfate and low-temperature activator required are relatively large, and the ability to increase the gel breaking rate and shorten the gel breaking time of the fracturing fluid cannot fully meet the needs of the field. construction requirements

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] A low-temperature guar gum fracturing fluid, consisting of base fluid, crosslinking agent borax and gel breaker (NH4) 2 S 2 o 8 composition. The base liquid includes the following components in mass percentage: 0.4% hydroxypropyl guar gum, 0.1% formaldehyde, 0.3% drainage aid, 0.02-0.03% sodium hydroxide (adjust the pH value to 11), 1% KCl, low temperature Activator, the rest is water. The mass percentage of borax in the fracturing fluid is 1%. Breaker (NH4) 2 S 2 o 8 The concentration is 200 ppm. The cross-link ratio is 100:5.

[0029] Among them, the low-temperature activator is prepared by the following method: dissolving ligand A in methanol aqueous solution containing 60-75% methanol mass (the mass percentage of ligand A in methanol aqueous solution is 20%), heating to 60°C, using Adjust the pH to 4-5 with citric acid, add AgNO 3 , AgNO 3 The mass percentage is 3% in methanol aqueous solution, stirred evenly, and the pH is adjusted to 7-8 with ammonia wa...

Embodiment 2

[0042] A low-temperature guar gum fracturing fluid, consisting of base fluid, crosslinking agent borax and gel breaker (NH4) 2 S 2 o 8 composition. The base liquid includes the following components in mass percentage: 0.4% hydroxypropyl guar gum, 0.1% formaldehyde, 0.3% drainage aid, 0.02-0.03% sodium hydroxide (adjust the pH value to 11), 1% KCl, low temperature The concentration of activator is 10-30ppm, and the rest is water. The mass percentage of borax in the fracturing fluid is 1%. Breaker (NH4) 2 S 2 o 8 The concentration is 200 ppm. The cross-link ratio is 100:5.

[0043] Among them, the low-temperature activator is prepared by the following method: dissolving ligand B in methanol aqueous solution containing 60-75% of methanol mass, the mass percentage of ligand B in methanol aqueous solution is 35%, heating to 60°C, using lemon Acid to adjust pH to 4-5, add AgNO 3 , AgNO 3 The mass percentage is 5% in methanol aqueous solution, the mixture is stirred evenly...

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Abstract

The invention discloses a low-temperature melon gel fracturing liquid which comprises a base liquid, a crosslinking agent and a gel breaker. The base liquid comprises melon gel, formaldehyde, a cleanup additive, a low-temperature activator, sodium hydroxide and water. The gel breaker is a water-soluble complex which is prepared from silver nitrate and a ligand A of the structure shown in the formula I or a ligand B of the structure shown in the formula II and stably exists under the alkaline conditions. The consumption mass ratio of the silver nitrate to the ligand A or the ligand B is (3-5):(20-35). The base liquid comprises, by mass, 0.3-0.6% of the hydroxypropyl melon gel, 0.05-0.2% of the formaldehyde, 0.1-0.4% of the cleanup additive, 0.02-0.03% of the sodium hydroxide, 5-30 ppm of the low-temperature activator and the balance water. The sodium hydroxide is used for adjusting the pH value of the base liquid to 10-11. The low-temperature melon gel fracturing liquid is suitable fora reservoir stratum at 20-25 DEG C, and the low-temperature activator in the low-temperature melon gel fracturing liquid can activate the gel breaking reaction of the gel breaker ((NH4)2S2O8).

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a low-temperature guar gum fracturing fluid system suitable for 20-50°C reservoirs. Background technique [0002] With the development of exploration and development technology, low-permeability oil and gas reservoirs with permeability lower than 50mD have gradually become the main body of oil reserve growth. There are a large number of low-permeability oil and gas reservoirs distributed all over the world, and their resources account for about 20%-60% of the basin resources, such as the Papina Oilfield in Canada and the Yanchang Oilfield and Changqing Oilfield in my country. [0003] The main reforming method for the development of low-permeability oil and gas fields is the hydraulic fracturing process. This technology has accumulated more than 60 years of experience and is widely used in oil field exploration and development. The specific implementation of the...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/887C09K8/905C09K2208/26
Inventor 王世彬高杨刘嘉文易辉永赵峰胡鹏刘城成石磊郭建春
Owner SOUTHWEST PETROLEUM UNIV
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