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An acidic cross-linked fracturing fluid

A fracturing fluid, acidic technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor physical properties, high clay content, difficult acidic crosslinking agent, etc., and achieve low surface interfacial tension and residue content, low core permeability damage, and good reservoir adaptability

Active Publication Date: 2015-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the current exploration situation, the ancient lithic sandstone reservoirs in this block have the characteristics of shallow gas reservoir burial depth, poor physical properties, high clay content, and low pressure coefficient. Therefore, it is necessary to develop an acidic fracturing fluid system that can Improving clay anti-swelling and post-press liquid flowback efficiency
[0003] However, carboxymethyl hydroxypropyl guar gum can be used for acidic cross-linking in foreign countries, but there is a lack of similar carboxymethyl guar gum products in China. In addition, it has the disadvantages of high cost and low viscosity, which cannot meet the needs of deep wells and large-scale fracturing construction.
Domestic acidic cross-linking thickeners mainly use hydroxypropyl guar gum, because it is cross-linked by hydroxyl groups and lacks cross-linking groups under acidic conditions, so it is difficult to have a matching acidic cross-linking agent with better performance

Method used

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  • An acidic cross-linked fracturing fluid
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  • An acidic cross-linked fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 30m on site 3 Add 28m to the container 3 Clean water, and then slowly add 196Kg of modified starch thickener while circulating with a pump, and then add foaming agent, clay stabilizer, and drainage aid in sequence according to the formula ratio, and continue to circulate for 10 minutes. Continue to circulate and top up with liquid for 20 minutes to ensure that the liquid is well mixed to form Solution A.

[0023] Pour the cross-linking agent into 2m immediately before construction 3 container, as Solution B.

[0024] During fracturing construction, while pumping solution A, mix solution B at a volume ratio of A:B=100:0.8-1.2, and add a gel breaker to form an acidic gel fracturing fluid.

Embodiment 2

[0026] 30m on site 3 Add 28m to the container 3 Clean water, then slowly add 196Kg modified starch thickener CJ2-9 under the condition of pump circulation, due to CO 2 Foam fracturing requires a large amount of foam, so add foaming agent twice the formula ratio, then add clay stabilizer and drainage aid in turn according to the formula ratio, and continue to circulate for 10 minutes. Continue to circulate and top up with liquid for 20 minutes to ensure that the liquid is well mixed to form Solution A.

[0027] Pour the cross-linking agent into 2m immediately before construction 3 container, as Solution B.

[0028] During fracturing construction, while pumping solution A, mix solution B at a volume ratio of A:B=100:0.8-1.2 to form acidic gel fracturing fluid, which is then mixed with liquid CO in the surface manifold 2 Mix and foam, and add breaker to form CO 2 Foam fracturing fluid.

Embodiment 3

[0030] The fracturing fluid is a mixture having the following parts by weight:

[0031] Solution A:

[0032]

[0033] Solution B:

[0034] 100 parts of acidic crosslinking agent

[0035] The solution A and the solution B are uniformly mixed at a volume ratio of 100:0.8-1.2 to prepare an acidic jelly fracturing fluid.

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Abstract

The invention relates to an acidic cross-linking fracturing liquid. The acidic cross-linking fracturing liquid is characterized in that the acidic cross-linking fracturing liquid is formed by a solution A and a solution B, the volume ratio of the solution A to the solution B is 100:0.5-2.0, the solution A comprises 0.5-1.0 part by weight of a modified starch thickening agent, 0.5-0.8 parts by weight of a foaming agent, 0.5-1.0 part by weight of a clay stabilizer, 0.5-0.8 parts by weight of a cleanup additive, 0.005-0.5 parts by weight of a gel breaker, and 96-98 parts by weight of water, and the solution B comprises 0.5-1.0 part by weight of a cross-linking agent and 99-99.5 parts by weight of water. The acidic cross-linking fracturing liquid has good rheology and gel breaking performances, satisfies requirements of long-crack and high-sand-ratio construction and CO2 foam fracturing construction technologies, has a low damage to the permeability of a rock core, has a good reservoir stratum adaptability, can effectively inhibit the clay expansion, and has an excellent gel breaking performance and low residues.

Description

technical field [0001] The invention relates to an acidic cross-linked fracturing fluid which improves the anti-swelling of the clay in the debris sandstone reservoir and reduces formation damage. Background technique [0002] In recent years, the eastern part of the Changqing Sulige Gas Field has become a key area for increasing reserves and production, as well as the focus of natural gas exploration and development. However, judging from the current exploration situation, the ancient lithic sandstone reservoirs in this block have the characteristics of shallow gas reservoir burial depth, poor physical properties, high clay content, and low pressure coefficient. Therefore, it is necessary to develop an acidic fracturing fluid system that can Improve clay anti-swelling and post-press liquid flowback efficiency. [0003] However, carboxymethyl hydroxypropyl guar gum can be used for acidic cross-linking in foreign countries, but there is a lack of similar carboxymethyl guar g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 吴江杨华赵振峰李宪文赵文薛小佳唐梅荣吕海燕吕宝强
Owner PETROCHINA CO LTD
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