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A kind of acidic aggravated fracturing fluid and its preparation method and application

A fracturing fluid and acid technology, applied in the field of fracturing fluid, can solve the problems of aggravating the long-term development of the fracturing fluid system, unavoidable secondary damage to the formation, large price fluctuations, etc. The effect of improving temperature resistance and shear resistance

Active Publication Date: 2017-04-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Generally speaking, the existing technology has realized the weighting of fracturing fluid to a certain extent, but there are some problems in the current system (1) The crosslinking agents used are all metal ion crosslinking agents of boron or zirconium, and Cross-linking under certain conditions will inevitably cause secondary damage to the formation; (2) The thickener used is generally vegetable glue, which has a high content of insoluble matter and large price fluctuations, which is not conducive to the long-term development of the aggravated fracturing fluid system

Method used

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  • A kind of acidic aggravated fracturing fluid and its preparation method and application
  • A kind of acidic aggravated fracturing fluid and its preparation method and application
  • A kind of acidic aggravated fracturing fluid and its preparation method and application

Examples

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Effect test

Embodiment 1

[0041] 30% weighting agent sodium citrate, thickener (acrylamide and 2-acrylamide-2-methylpropanesulfonic acid mass ratio is 1:1 synthetic polymer viscosity-average molecular weight is about 12 million. Wherein polymerization temperature is at 12 ℃, reaction time 3-5 hours.) 0.7%, pH regulator sulfamic acid 0.05%, aldehyde crosslinking agent hexamethylenetetramine 0.25%, phenolic crosslinking agent resorcinol 0.015%; Accelerator triethylenediamine 0.02%, demulsifier SP16 90.1%, iron ion stabilizer EDTA disodium 1.0%, ammonium persulfate 0.05%, sodium nitrite 0.025% and the balance of water are mixed to prepare the present invention of fracturing fluid. Its preparation method is:

[0042] (1) Preparation of base liquid: Add 60g of weighting agent, 2g of iron ion stabilizer, 0.1g of pH regulator and 0.2g of demulsifier SP1690.2g into 127.3g of water, slowly add 1.4g of thickener under stirring, continue to Stir for 2 hours until the polymer is fully dissolved;

[0043] (2) Pr...

Embodiment 2

[0049] The weighting agent sodium citrate 20%, thickener (acrylamide and 2-acrylamide-2-methylpropanesulfonic acid mass ratio is 1:1 synthetic polymer viscosity average molecular weight is about 12 million. Polymerization temperature is at 12 ℃ , reaction time 3-5 hours.) 0.8%, pH regulator sulfamic acid 0.1%, aldehyde crosslinking agent hexamethylenetetramine 0.2%, phenolic crosslinking agent resorcinol 0.01%; crosslinking promotion The fracturing fluid of the present invention is prepared by mixing 0.1% triethylenediamine, 0.1% demulsifier SP1690.1%, 0.5% iron ion stabilizer citric acid, 0.1% ammonium persulfate, 0.05% sodium nitrite and the rest of water.

[0050] Its preparation method is:

[0051] (1) Base liquid preparation: Add 40g of weighting agent, 1g of iron ion stabilizer, 0.2g of pH regulator and 0.2g of demulsifier SP1690.2g into 138g of water, slowly add 0.6g of thickener under stirring, and continue stirring after adding 2h, until the polymer is fully dissolve...

Embodiment 3

[0058] The weighting agent sodium citrate 25%, thickener (acrylamide and 2-acrylamide-2-methylpropanesulfonic acid mass ratio is 1:1 synthetic polymer viscosity average molecular weight is about 12 million. Polymerization temperature is at 12 ℃ , reaction time 3-5 hours.) 0.75%, pH regulator sulfamic acid 0.075%, aldehyde crosslinking agent hexamethylenetetramine 0.1%, phenolic crosslinking agent resorcinol 0.005%; crosslinking promotion The fracturing fluid of the present invention is prepared by mixing 0.05% triethylenediamine, 90.2% demulsifier SP16, 0.75% ferric acetate stabilizer, 0.1% ammonium persulfate, 0.025% sodium nitrite and the rest of water.

[0059] Its preparation method is:

[0060] (1) Base liquid preparation: Add 50g of weighting agent, 1.5g of iron ion stabilizer, 0.15g of pH regulator and 0.4g of demulsifier SP1690.4g into 126.45g of water, and slowly add 1.5g of thickener under stirring. Continue to stir for 2 hours until the polymer is fully dissolved; ...

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Abstract

The invention provides an acidic weighted fracturing fluid, and a preparation method and application thereof. The fracturing fluid comprises the following components in percentage by weight: 20-30% of weighting agent, 0.7-0.8% of thickener, 0.05-0.1% of pH regulator, 0.1-0.25% of aldehyde crosslinking agent, 0.005-0.015% of phenol crosslinking agent, 0.02-0.1% of crosslinking accelerator, 0.1-0.2% of demulsifier SP169, 0.5-1.0% of iron ion stabilizer, 0.05-0.1% of ammonium persulfate, 0.025-0.05% of sodium nitrate and the balance of water. The fracturing fluid has the advantages of small formation damage, favorable viscosity breaking performance and low cost.

Description

technical field [0001] The invention relates to a fracturing fluid used in the field of fracturing and stimulation in oil and gas fields, in particular to an aggravated fracturing fluid suitable for fracturing reconstruction of high-pressure, deep wells and ultra-deep wells, in particular to an acidic aggravated fracturing fluid and Its preparation method and application. Background technique [0002] According to data, 90% of the world's oil fields have entered the mature stage, and the output of old areas has declined; and with the continuous improvement of exploration, it has become more difficult to exploit oil and gas in areas with better geographical conditions in the past, and the discovery of conventional oil and gas fields is also gradually decreasing. The scale of newly discovered oil fields is generally decreasing, and the growth of crude oil and other production is relatively weak. Oil exploration and development has shown an unfavorable situation of high cost an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/665C09K8/685C09K8/882C09K8/887C09K2208/26
Inventor 王超欧阳坚朱卓岩王凤王源源陈国浩薛俊杰
Owner PETROCHINA CO LTD
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