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Method for preparing guargum fracturing fluid, guargum fracturing fluid prepared by method and application of guargum fracturing fluid

A technology of guar fracturing fluid and base fluid, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problem of low viscosity of base fluid, inability of guar gum to quickly and effectively disperse stickiness, and guar gum. Fracturing fluid can not be used and other problems, to achieve the effect of low cost, simple and low process

Inactive Publication Date: 2019-06-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a kind of method for preparing guar gum fracturing fluid, guar gum fracturing fluid and application thereof prepared by the method, to solve the problem of guar gum in the prior art in high salinity formation water or ground surface The viscosity cannot be quickly and effectively dispersed in water, and the viscosity of the base fluid is low; guar gum fracturing fluid cannot be applied to reservoirs with a salinity higher than 100,000mg / L and a temperature higher than 100°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Base fluid preparation

[0037] Add 0.02% citric acid and 0.02% hydroxyethylene diphosphoric acid to formation water or surface water with a mineralization degree of 300,000 mg / L, disperse and dissolve uniformly, add 0.5% hydroxypropyl guar gum, and stir to fully swell. Then add 0.05% quaternary ammonium salt type fungicide, 0.001% cationic polymer type clay stabilizer, 0.5% KW-1 (Xinjiang Zhongtai Chemical Co., Ltd.), and mix uniformly to prepare a base fluid. (The percentages are all mass ratios, the same below.)

[0038] Step 2: Preparation of cross-linking solution

[0039] 40% YGB, 40% HT, and 5% sodium hydroxide are added to clean water to prepare a cross-linking liquid.

[0040] Step 3: Fracturing fluid preparation:

[0041] In the base fluid of step 1, add the cross-linking fluid of step 2 in a volume ratio of 100:1.5, and stir to form a fracturing fluid jelly.

[0042] Tested fracturing fluid system 140℃, 170s -1 The shear viscosity in the next hour was 114.7 mP...

Embodiment 2

[0044] Step 1: Base fluid preparation

[0045] Add 0.02% citric acid and 0.02% amino trimethylene phosphonic acid to formation water or surface water with 300,000 mg / L salinity, disperse and dissolve uniformly, add 0.5% hydroxypropyl guar gum, and stir to fully swell. Then add 0.05% organic ammonium salt type bactericide, 0.001% cationic polymer type clay stabilizer, 0.5% KW-1 (Xinjiang Zhongtai Chemical Co., Ltd.), and mix uniformly to prepare a base fluid. (The percentages are all mass ratios, the same below.)

[0046] Step 2: Preparation of cross-linking solution

[0047] Add 40% YGB, 40% HT, 4% sodium hydroxide and mix in the clear water to prepare a cross-linking liquid.

[0048] Step 3: Fracturing fluid preparation:

[0049] In the base fluid of step 1, add the cross-linking fluid of step 2 in a volume ratio of 100:1 and stir to form a fracturing fluid jelly.

[0050] Tested fracturing fluid system 120℃, 170s -1 The shear viscosity in the next hour was 103 mPa·s, and the heat res...

Embodiment 3

[0052] Step 1: Base fluid preparation

[0053] Add 0.02% citric acid and 0.018% ethylenediamine tetramethylene phosphoric acid to formation water or surface water with a salinity of 250,000 mg / L, disperse and dissolve uniformly, add 0.5% hydroxypropyl guar gum, and stir to fully swell. Then add 0.05% organic ammonium salt type fungicide, 0.02% ammonium chloride, 0.4% KW-1 (Xinjiang Zhongtai Chemical Co., Ltd.), and mix uniformly to prepare a base liquid. (The percentages are all mass ratios, the same below.)

[0054] Step 2: Preparation of cross-linking solution

[0055] Add 40% YGB, 30% HT, 4% sodium hydroxide and mix in the clear water to prepare a cross-linking liquid.

[0056] Step 3: Fracturing fluid preparation:

[0057] In the base fluid of step 1, add the cross-linking fluid of step 2 in a volume ratio of 100:1 and stir to form a fracturing fluid jelly.

[0058] Tested fracturing fluid system 120℃, 170s -1 The shear viscosity in the next hour is 121 mPa·s, and the heat resistan...

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Abstract

The invention provides a method for preparing guargum fracturing fluid, the guargum fracturing fluid prepared by the method and an application of the guargum fracturing fluid. The method comprises thesteps: (a) adding a solubilizer, a screening agent, guargum, a microbicide, a clay stabilizer and a discharge aiding agent into formation water or superficial water, and carrying out mixing, so as toobtain a base solution; (b) adding a cross-linker, a high-temperature stabilizer and a pH regulator into water, and carrying out mixing, so as to obtain crosslinked fluid; and (c) adding the crosslinked fluid into the base solution according to a volume ratio of 100: (1 to 1.5), and carrying out mixing, thereby obtaining the guargum fracturing fluid, wherein the solubilizer comprises one or moreof citric acid, acetic acid and lactic acid, the screening agent comprises one or more of hydroxyl ethylene phosphoric acid, amino trimethylene phosphonic acid and ethylenediamine tetramethylene phosphoric acid, and the high-temperature stabilizer is an organic zirconium compound. According to the method, the rapid-dispersed tackifying of the guargum in the formation water or superficial water ispromoted, the temperature resistance of the fracturing fluid is improved, the fracturing fluid can be applied to reservoirs of 30 DEG C to 140 DEG C, and thus, the effective utilization of highly-mineralized formation water or superficial water is achieved.

Description

Technical field [0001] The present invention relates to the field of petrochemical industry, in particular to a method for preparing guar gum fracturing fluid, guar gum fracturing fluid prepared by the method and applications thereof. Background technique [0002] With the large-scale development of low-permeability reservoirs, hydraulic fracturing, as an important reservoir improvement and production increase measure, has received more and more attention, and the consequent shortage of water for large-scale hydraulic fracturing in arid areas is also imminent. On the other hand, if a large amount of formation water produced by oilfield development is directly discharged, it will seriously pollute the environment, and its treatment problems need to be solved urgently. Therefore, the effective use of formation water for the preparation of fracturing fluids can not only alleviate the demand for large-scale fracturing water, but also solve the environmental protection pressure faced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/26
Inventor 郑苗邬国栋潘竟军怡宝安麦尔耶姆古丽·安外尔阿不都维力·阿不力米提张敬春吕振虎阿丽娅·孜比不拉杨建强
Owner PETROCHINA CO LTD