Low temperature gel breaking viscosity reducer of crosslinked guar gum backflow fracturing fluid, and preparation method thereof

A technology of fracturing flowback fluid and cross-linked guar gum, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of unconsidered gel breaking and viscosity reduction treatment cost, high processing cost, and low temperature gel breaking. Viscosity reduction literature and other issues, to achieve the effect of reducing solubility and hydrodynamic size, low cost, and reducing viscosity

Inactive Publication Date: 2017-04-19
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, the fracturing flowback fluid targeted by the existing gel-breaking and viscosity-reducing technologies is not clearly cross-linked guar gum (jelly) fracturing flowback fluid, and the gel-breaking temperature is higher than 20°C, and low temperature has not yet been seen. Gel breaking and viscosity reducing literature and patent reports; the cost of gel breaking and viscosity reducing treatment is not considered. For example, if the amount of gel breaking agent potassium ferrate is 3000mg / L, the cost of gel breaking treatment is 78 yuan / m 3 , resulting in high processing costs

Method used

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  • Low temperature gel breaking viscosity reducer of crosslinked guar gum backflow fracturing fluid, and preparation method thereof

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preparation example Construction

[0036] The preparation method of the cross-linked guar gum fracturing flowback fluid of the present invention has the following steps:

[0037] 1) Preparation of component A:

[0038] Weigh the accelerator and the oxidant according to the proportion of parts by mass, and add them to the water in sequence at a stirring rate of 60-90 rpm to fully dissolve and react for 3-5 minutes to obtain component A, which is sealed for later use;

[0039] 2) Preparation of component B:

[0040] Weigh the reducing agent and dissolve it in water according to the mass parts ratio, and stir for 2-4 min at a stirring rate of 60-90 rpm to fully dissolve it to obtain component B, which is sealed for later use;

[0041] 3) Mixed reaction:

[0042] Mix Component A and Component B according to the mass ratio A:B=1:0.7-1.3, and react for 3-5min at a stirring rate of 90-120rpm to obtain the low-temperature gel breaking of the cross-linked guar gum fracturing flowback fluid. Adhesive. In the above technical solut...

Embodiment 1

[0047] The preparation method of the low-temperature gel breaking and viscosity reducing agent of this embodiment is as follows:

[0048] Preparation of component A: Weigh 6g accelerator (2g ammonium persulfate, 4g potassium persulfate) and 6g oxidant (5g hydrogen peroxide, 1g sodium hypochlorite), and add them to 88g water at a stirring rate of 60rpm. Fully dissolve and react for 3 minutes, and seal for later use.

[0049] Preparation of component B: Weigh 80 g of reducing agent (ferrous sulfate) and dissolve it in 20 g of water, stir at 60 rpm for 3 minutes to fully dissolve it, and seal it for later use.

[0050] Mixing reaction: Component A and component B are mixed according to the mass ratio A:B=1:0.7, and reacted for 3min under the conditions of stirring speed of 90rpm and temperature of 5℃ to obtain crosslinked guar gum fracturing flowback fluid Low temperature gel breaking and viscosity reducing agent.

[0051] Take 100g of a well high-viscosity (viscosity 4.4mPa.s) cross-li...

Embodiment 2

[0053] The preparation method of the low-temperature gel breaking and viscosity reducing agent of this embodiment is as follows:

[0054] Preparation of component A: Weigh 7g accelerator (3g sodium thiosulfate, 4g potassium persulfate) and 7g oxidant (5g potassium dichromate, 2g hydrogen peroxide), and add to 86g at 80rpm stirring speed. Dissolve and react for 4 minutes in water, and seal for later use.

[0055] Preparation of component B: Weigh 88g reducing agent (42g sodium sulfite, 46g stannous sulfate) and dissolve it in 12g water, stir at 90rpm for 4min to make it fully dissolved, and seal it for later use.

[0056] Mixing reaction: Mix component A and component B according to the mass ratio A:B=1:1.3, and react for 5 minutes at a stirring rate of 110rpm and a temperature of 10°C to obtain a cross-linked guar gum fracturing flowback fluid Low temperature gel breaking and viscosity reducing agent.

[0057] Take 100g of a well high-viscosity (viscosity 5.6mPa.s) cross-linked guar ...

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Abstract

The invention discloses a low temperature gel breaking viscosity reducer of a crosslinked guar gum backflow fracturing fluid, and a preparation method thereof. The low temperature gel breaking viscosity reducer is prepared through mixing a component A with a component B according to a mass ratio of 1:(0.7-1.3), and the component comprise, by mass, 6-10 parts of an accelerator, 6-10 parts of an oxidant and 80-88 parts of water, and the part sum of all the compositions of the component A is 100; the component B comprises, by mass, 80-88 parts of a reducing agent and 12-20 parts of water, and the part sum of the reducing agent and the water is 100; and the accelerant is selected from sodium hyposulfite, ammonium persulfate and potassium persulfate. The low temperature gel breaking viscosity reducer can realize rapid reaction and generation of a large amount of free radicals at a low temperature of 5-15 DEG C in order to highly-effectively destroy guar gum molecule long-chain chemical bonds and crosslinked dative bonds in the crosslinked guar gum backflow fracturing fluid, so the viscosity of the backflow fracturing fluid is effectively reduced to 2 mPa.s or below.

Description

Technical field [0001] The present invention relates to the technical field of oilfield chemistry, in particular to a low-temperature gel breaking and viscosity reducing agent for cross-linked guar gum fracturing flowback fluid. The present invention also relates to the low-temperature gel breaking and viscosity reducing agent of cross-linked guar gum fracturing flowback fluid. Preparation method of the agent. Background technique [0002] As my country's demand for energy continues to increase and conventional oil and gas resources are increasingly depleted, the development of unconventional oil and gas resources has received more and more attention. The development of unconventional oil and gas resources usually uses horizontal well multi-stage staged fracturing technology, which requires the use of a large amount of fracturing fluid. The fracturing fluid used in the existing fracturing technology is water-based fracturing fluid, oil-based fracturing fluid or foam fracturing f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/665C09K2208/26
Inventor 唐善法杨曦刘璇周天元蒲明政廖守稷郑雅慧
Owner YANGTZE UNIVERSITY
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