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Multifunctional drag reduction water system for continental shale gas fracturing and preparation method thereof

A multi-functional, drag-reducing water technology, applied in the field of oil and gas field exploration and development, can solve the problem that the inhibition effect cannot meet the requirements of continental shale rock stability, and cannot achieve long-term and efficient inhibition of clay minerals, and is sensitive to the strength of continental shale. It can reduce problems such as reducing clay particle migration, meet the requirements of large-displacement construction, and inhibit clay mineral expansion and clay particle migration.

Active Publication Date: 2020-02-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The clay content of continental shale cores is as high as 50%, and the proportion of sensitive illite-smectite mixed layer and montmorillonite is high. The conventional drag reducing water system cannot achieve long-term and efficient suppression of clay minerals, or the suppression effect is not satisfactory Stability requirements for continental shale rocks;
[0004] (2) The additives of conventional drag-reducing water cannot effectively reduce or inhibit the complex water-rock reaction, resulting in the characteristics of reduced strength, adsorption damage, and long-term stability of sensitive continental shale after stimulation, which seriously restricts the effect. Therefore, There is an urgent need for a new type of drag-reducing water system that can reduce imbibition, inhibit water-rock reaction, and reduce adsorption damage

Method used

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  • Multifunctional drag reduction water system for continental shale gas fracturing and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A multifunctional drag-reducing water system suitable for continental shale gas fracturing, the preparation method of which comprises the following steps:

[0039] 1) Weighing and measuring of raw materials, each raw material and its mass percentage include:

[0040] Drag-reducing agent (supramolecular polymer APCF-1 40%, polyvinylpyrrolidone 20%, polyvinyl alcohol 40%) 0.02%, inhibitor 0.5%, anti-scaling agent 0.1%, synergist 0.001%, regulator 0.2% , and the rest is water;

[0041]2) Add 500ml of water into the mixer, adjust the rotation speed of the mixer to 450r / min, add the drag reducing agent and stir to dissolve for 1min, then add the measured inhibitor, anti-scaling agent, synergist and regulator in sequence, and stir evenly , to prepare the multifunctional drag-reducing water system.

[0042] According to the standard of "NB / T 14003.3-2017 Shale Gas Fracturing Fluid Part 3: Performance Index and Evaluation Method of Continuously Mixed Fracturing Fluid", some p...

Embodiment 2

[0046] A multifunctional drag-reducing water system suitable for continental shale gas fracturing, the preparation method of which comprises the following steps:

[0047] 1) Weighing and measuring of raw materials, each raw material and its mass percentage include:

[0048] Drag-reducing agent (supramolecular polymer APCF-1 60%, polyvinylpyrrolidone 25%, polyvinyl alcohol 15%) 0.05%, inhibitor 1%, anti-scaling agent 0.3%, synergist 0.003%, regulator 0.5% , and the rest is water;

[0049] 2) Add 500ml of water into the mixer, adjust the rotation speed of the mixer to 500r / min, add the drag reducing agent and stir to dissolve for 1min, then add the measured inhibitor, anti-scaling agent, synergist and regulator in sequence, and stir evenly , to prepare the multifunctional drag-reducing water system.

[0050] According to the standard of "NB / T 14003.3-2017 Shale Gas Fracturing Fluid Part 3: Performance Index and Evaluation Method of Continuous Mixed Fracturing Fluid", some perf...

Embodiment 3

[0054] A multifunctional drag-reducing water system suitable for continental shale gas fracturing, the preparation method of which comprises the following steps:

[0055] 1) Weighing and measuring of raw materials, each raw material and its mass percentage include:

[0056] Drag-reducing agent (supramolecular polymer APCF-1 50%, polyvinylpyrrolidone 15%, polyvinyl alcohol 35%) 0.03%, inhibitor 0.8%, anti-scaling agent 0.2%, synergist 0.002%, regulator 0.4% , and the rest is water;

[0057] 2) Add 500ml of water into the mixer, adjust the rotation speed of the mixer to 500r / min, add the drag reducing agent and stir to dissolve for 1min, then add the measured inhibitor, anti-scaling agent, synergist and regulator in sequence, and stir evenly , to prepare the multifunctional drag-reducing water system.

[0058] According to the standard of "NB / T 14003.3-2017 Shale Gas Fracturing Fluid Part 3: Performance Index and Evaluation Method of Continuously Mixed Fracturing Fluid", some ...

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Abstract

The invention relates to a multifunctional drag reduction water system for continental shale gas fracturing and a preparation method thereof. The multifunctional drag reduction water system for continental shale gas fracturing comprises the following components in percentages by mass: 0.02% to 0.05% of a resistance reducing agent, 0.5% to 1% of an inhibitor, 0.1% to 0.3% of an antiscaling agent, 0.001% to 0.003% of a synergist, 0.2% to 0.5% of a regulator and the balance of water. The multifunctional drag reduction water system provided by the invention has the characteristics of high drag reduction rate, high inhibition, permeability reduction, adsorption reduction and the like, clay mineral expansion and clay particle migration can be inhibited, a seepage channel is kept smooth, water-rock physical and chemical reactions are effectively inhibited, a fracturing fluid is promoted to flow back quickly, the adsorption damage of the fracturing fluid is reduced, the requirement of continental shale gas fracturing construction is met, the damage of the drag reduction water fracturing fluid to a reservoir is reduced, and efficient development of terrestrial shale gas is realized.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field exploration and development, and relates to a multifunctional drag-reducing water system and a preparation method for continental shale gas fracturing. Background technique [0002] The development of continental shale gas is still in its infancy in my country. At present, large-scale drag-reducing water fracture network fracturing technology is also used in the exploitation of continental shale gas. Due to the high clay content and the easy adsorption of drainage aids on the rock surface, the conventional drag reduction water system has the following problems: [0003] (1) The clay content of continental shale cores is as high as 50%, and the proportion of sensitive illite-smectite mixed layer and montmorillonite is high. The conventional drag reducing water system cannot achieve long-term and efficient suppression of clay minerals, or the suppression effect is not satisfactory Stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/665C09K8/68C09K8/882C09K8/885C09K2208/12C09K2208/28
Inventor 刘炜李奎东张炜肖佳林荣莽王振兴陈建达黄晓凯王小军
Owner CHINA PETROLEUM & CHEM CORP
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