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Synthetic polymer fracturing fluid for fracturing

A technology for synthesizing polymers and fracturing fluids, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of continuous mixing, slow polymer swelling rate, cumbersome liquid preparation process, etc., and achieve the goal of using Effects of wide temperature range, little reservoir damage, and low residue content

Active Publication Date: 2016-08-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When mixing the low-molecular polymer fracturing fluid in the prior art, it is necessary to add acetic acid to the water first, adjust the pH value of the water to weak acidity, and then prepare the polymer solution. The solution mixing process is cumbersome and the polymer swelling rate is slow , can not achieve continuous mixing; crosslinking agent and polymer crosslinking pH value is 5.3-5.7, crosslinking conditions are harsh, difficult to control on site; only applicable to the needs of alkali-sensitive reservoir fracturing reconstruction, the scope of application is narrow

Method used

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  • Synthetic polymer fracturing fluid for fracturing
  • Synthetic polymer fracturing fluid for fracturing

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Embodiment approach

[0037] As a preferred embodiment of the present invention, the present invention includes:

[0038] Base fluid: based on the mass of the total solution of low-damage synthetic polymer fracturing fluid prepared, of which: thickener accounts for 0.1%, foaming agent accounts for 0.1%, drainage aid accounts for 0.3%, clay stabilizer accounts for 0.3%, and the balance for water;

[0039] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.1%;

[0040] The thickener refers to: a partially hydrolyzed modified polyacrylamide with a molecular weight of about 2 million;

[0041] According to the above formula, using the conventional mixing method in the field, add the thickener into the water, stir for 3 minutes, then add the foaming agent, drainage aid, clay stabilizer, and then add the crosslinking agent to form the fracturing fluid.

[0042] When gel breaking is required, add 0.05% gel breake...

Embodiment 2

[0044] As another preferred embodiment of the present invention, the present invention includes:

[0045] Base fluid: based on the mass of the total solution of low-damage synthetic polymer fracturing fluid prepared, of which: thickener accounts for 0.3%, foaming agent accounts for 0.2%, drainage aid accounts for 0.3%, clay stabilizer accounts for 0.3%, and the rest amount of water;

[0046] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.3%;

[0047] All the other are with embodiment 1.

Embodiment 3

[0049] As the best implementation mode of the present invention, the present invention includes:

[0050] Base fluid: based on the mass of the total solution of the prepared low-harm synthetic polymer fracturing fluid, including: 0.5% thickener, 0.2% pH regulator, 0.3% clay stabilizer, 0.3% drainage aid, 0.3% foaming agent, and the balance of water;

[0051] The thickener refers to: a partially hydrolyzed modified polyacrylamide with a molecular weight of about 2 million;

[0052] Cross-linking agent: based on the mass fraction of the cross-linking agent relative to the base liquid, the cross-linking agent accounts for 0.5-0.55%;

[0053]Gel breaker: The gel breaker accounts for 0.01-0.02% based on the mass of the gel breaker relative to the total solution of the prepared low-damage synthetic polymer fracturing fluid.

[0054] Described pH adjusting agent is hydrochloric acid. The drainage aid is a fluorocarbon surfactant, a nonionic surfactant or a quaternary ammonium salt...

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Abstract

The invention discloses a synthetic polymer fracturing fluid for fracturing and relates to the technical field of cross-linked gel fracturing fluids. The synthetic polymer fracturing fluid comprises the components of base fluid and a cross-linking agent, wherein the base fluid comprises the following components in percentage by weight: 0.1-0.5 percent of thickening agent, 0.1-0.5 percent of clay stabilizer, 0.1-0.5 percent of discharge aiding agent, 0.1-0.5 percent of foaming agent, 0.1-0.5 percent of pH regulator and the balance of water; the cross-linking agent counts for 0.1-0.5 percent relative to the mass percentage of the base fluid. According to the synthetic polymer fracturing fluid disclosed by the invention, the damage to a reservoir due to the fracturing fluid can be effectively reduced, the content of residue is low, the range of the use temperature is wide, the fracturing and reforming effects are improved and the requirements on yield increase and reformation of oil and gas fields are met.

Description

technical field [0001] The invention relates to the technical field of cross-linked jelly fracturing fluid, in particular to a low-damage synthetic polymer fracturing fluid for fracturing. Background technique [0002] As a key technology for the exploration and development of low-permeability oil and gas fields, fracturing technology has been widely used in Changqing Oilfield and many domestic oilfields. How to effectively save costs, control and reduce secondary damage caused by fracturing, and improve the effect of fracturing to increase production is a key issue. The key problems to be solved in the development of low permeability oil and gas fields. Currently used fracturing fluids include guar gum fracturing fluid, polymer fracturing fluid, foam fracturing fluid, alcohol-based fracturing fluid, oil-based fracturing fluid, clean fracturing fluid, etc. Among them, guar gum fracturing fluid is the most widely used Mature and extensive, although the fracturing fluid of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 李勇宋振云李志航汪小宇王所良王忍峰王玉功蒋文学唐冬珠陈迎花付振银武龙荆建春金娜周然柴巧玲王季鹏李童杨发
Owner BC P INC CHINA NAT PETROLEUM CORP