Slickwater fracturing fluid drag reducer and preparation method thereof

A technology of hydraulic fracturing and drag reducing agent, which is applied in low-porosity unconventional reservoir reconstruction and low-permeability fields. It can solve the problems of large oil and water and the complexity of microemulsion systems, and achieve fast dissolution, good fracturing effect, and stable good sex effect

Active Publication Date: 2013-04-03
CHENGDU BAICHUN PETROLEUM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention overcomes the deficiencies of the prior art, proposes a drag reducer (code name BC-12) suitable for slick water fracturing fluid and its preparation method, and solves the problems of the complexity of the microemulsion system and the relatively large oil-water ratio

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  • Slickwater fracturing fluid drag reducer and preparation method thereof
  • Slickwater fracturing fluid drag reducer and preparation method thereof
  • Slickwater fracturing fluid drag reducer and preparation method thereof

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with specific embodiments.

[0022] Dissolve monomer acrylamide and functional monomer MAA (methacrylic acid) in 3% NaCl aqueous solution at a mass ratio of 3:1 to form an aqueous solution with a monomer mass concentration of 33%, which is the aqueous phase;

[0023] Mix and dissolve the surfactant and cyclohexane at a mass ratio of 2:9, and add it to a four-necked flask equipped with a reflux condenser, a thermometer, and a stirrer, wherein the surfactants are Span-80 and Tween-60 at a ratio of 4:3 It is compounded with the mass ratio of HLB=8.7. Place the four-neck flask in a constant temperature bath pot at 45°C, blow nitrogen gas and stir for 15-20 minutes, slowly drop the water phase into the four-necked flask, the ratio of oil to water is 2:3, continue stirring with nitrogen gas for 30 minutes to make it fully emulsified ; Slowly add water-soluble initiator AIBI and oil-soluble initiator V-65 ...

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Abstract

The invention discloses drag reducer which can be applied to slickwater fracturing fluid and a method for preparing drag reducer. The method includes: adding organic salt into acrylamide and functional monomer aqueous solution to prepare an aqueous phase, adding the aqueous phase into an oil phase system consisting of surfactant and base oil under the condition of high-speed stirring to form a stable W/O (water in oil) type microemulsion system, feeding nitrogen for dispersing oxygen, and adding initiator for polymerization to form a branchless long chain structure. The polymer microemulsion is a transparent or semitransparent thermodynamic stable system, can be quickly swelled into water and is directly usable. Adding a small quantity of the drag reducer during fluid transport can improve flow quantity and reduce energy consumption to some extent, and the drag reduction effect can reach 30%-65% when the drag reducer is compared with clear water. The drag reducer has the advantages of high stability, dissolving speed and dissolving performance, convenience in use, remarkable drag reduction effects and the like and is applicable to the slickwater fracturing technology, and excellent yield increasing effects are obtained after the drag reducer is applied to field fracturing operations.

Description

technical field [0001] The invention relates to the field of low-permeability and low-porosity unconventional reservoir reconstruction, in particular to a drag reducer (code name BC-12) suitable for slick water fracturing fluid and a preparation method thereof. Background technique [0002] With the upsurge of unconventional oil and gas resources exploitation, the slick water fracturing technology is applicable to the exploitation of low-permeability and low-porosity unconventional reservoirs (adding a small amount of drag reducer and some additives in clean water as working fluid, and adding Fracturing operations with a small amount of proppant) have been increasingly popularized. Therefore, the use of additives in slickwater fracturing fluids, especially the application and demand of drag reducers are also increasing. [0003] The earliest drag reducer was carried out by solution polymerization. The aqueous solution polymerization has high molecular weight and less impurit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 刘通义向静陈光杰赵众从林波牛光洲谭坤戴秀兰黄趾海张立丰
Owner CHENGDU BAICHUN PETROLEUM TECH
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