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Organic boron crosslinking agent and guar gum fracturing fluid

A technology of organic boron and cross-linking agent, which is applied in the field of organic boron cross-linking agent and guar gum fracturing fluid containing the cross-linking agent, can solve the problem of weak intermolecular force of guar gum, poor hanging performance, and intermolecular cross-linking. Low linking degree and other problems, to achieve good cross-linking performance and temperature resistance, improve cross-linking performance and temperature resistance, and reduce the amount of cross-linking agent

Inactive Publication Date: 2019-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also the following disadvantages: the conventional guar gum fracturing fluid will leave a large amount of residue in the fracture and on the fracture wall during the fracturing construction process, causing damage to the reservoir, resulting in a decrease in the seepage capacity and production capacity of the formation, directly affecting the fracturing process. Effect
[0012] For the low-concentration guar gum fracturing fluid system, due to the low concentration of guar gum used, the intermolecular force of guar gum in the aqueous solution is weakened. Low cross-linking degree and low cross-linking strength will lead to poor cross-linking effect and poor hanging performance

Method used

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  • Organic boron crosslinking agent and guar gum fracturing fluid
  • Organic boron crosslinking agent and guar gum fracturing fluid
  • Organic boron crosslinking agent and guar gum fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 prepares organoboron crosslinking agent

[0041] Add 31g of boric acid and 120g of ethylene glycol into a four-necked flask equipped with a condenser / water separator, a stirring paddle, a dropping funnel, and a thermometer, and heat up to 65°C under stirring. After all the materials are dissolved, add 37g of n-butyl Alcohol, heated to 115°C with stirring, reacted for 2 hours, until the amount of released water did not change, and the amount of water was about 25g; then added 19g of tetraethylenepentamine dropwise to the four-necked flask, raised the temperature to 130°C, reacted for 2 hours, until the released water The amount of n-butanol does not change anymore, the amount of n-butanol is about 35g, and finally cooled to room temperature to obtain the product.

Embodiment 2

[0042] Example 2 Preparation of fracturing fluid base fluid

[0043] Add 493g of water into the mixer, add 1.50g of instant hydroxypropyl guar gum SRG-1 under stirring, after dissolving for 3 minutes, add 0.5g of sodium gluconate, 2.50g of anti-swelling agent FP-1, 1.5g of drainage aid Agent ME-2, 0.5g sodium carbonate, 0.5g fungicide SK-1 and 0.5g anti-emulsifier SF-1, stirred and dissolved for 2min, let stand for 1h, and prepared fracturing fluid base fluid with guar gum concentration of 0.30%. Fracturing fluid base fluid apparent viscosity 21mPa s (170s -1 ), the pH value is 10.5.

Embodiment 3

[0044] Example 3 Fracturing Fluid Crosslinking Performance and Temperature and Shear Resistance

[0045] Take 100 mL of the fracturing fluid base fluid prepared in Example 2, add 0.35 g of the organoboron cross-linking agent prepared in Example 1, and obtain hydroxypropyl guar gum boron jelly fracturing fluid, and the cross-linking time is 1 min. The cross-linking jelly can be Hanging glass rods. Using the fracturing fluid temperature and shear resistance test method specified in SY / T 5107-2005 "Water-based Fracturing Fluid Performance Evaluation Method", the fracturing fluid resistance at 120°C was tested with a HAAKE MARS III high temperature rheometer. temperature and shear properties, results such as figure 1 stated, 120℃, 170s -1 The apparent viscosity of the system is 142mPa·s under shear conditions for 90min.

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Abstract

The invention discloses an organic boron crosslinking agent prepared by reacting boric acid with an organic polyamine compound in the absence of water, wherein the organic polyamine compound is selected from diethylenetriamine, triethylenetetramine, 1,4,7,10,13-pentaazatridecane, polyethylene-polyamines or polyethyleneimine. The invention also discloses a guar gum fracturing fluid, which includes,by weight, the following components:0.2%-0.6% of hydroxypropyl guar gum, 0.2%-0.6% of the organic boron crosslinking agent described in claim 1, 0.01%-0.2% of a pH regulating agent, 0-0.5% of a temperature stabilizer, 0.2%-2% of other additives, with the balance being water. The organic boron crosslinking agent of the invention has a large molecular volume and a plurality of cross-linking pointsformed with a low-concentration guar gum aqueous solution, and so, cross-linking properties and temperature resistance performance of a gelled fracturing fluid are improved, the using amount of the cross-linking agent is reduced, and the cost of a fracturing fluid system is reduced. The guar gum fracturing fluid of the invention has good cross-linking properties and good temperature resistance performance, the concentration of the hydroxypropyl guar gum can be adjusted according to the reservoir temperature, and the maximum usage temperature is 150 DEG C.

Description

technical field [0001] The invention relates to an organic boron crosslinking agent and guar gum fracturing fluid containing the crosslinking agent, belonging to the technical field of oil field development. Background technique [0002] Hydraulic fracturing is the main production stimulation measure for the development of low-permeability / ultra-low-permeability oil and gas reservoirs. Its principle is to use ground equipment to generate high pressure, use fracturing fluid as the main medium to create hydraulic fractures in the formation, and then use fracturing fluid to release the proppant Carried into fractures, forming supporting fractures with a certain conductivity for oil and gas, increasing single well production. [0003] Fracturing fluid is one of the important materials in hydraulic fracturing construction, and its main function is to transmit pressure and carry proppant into the formation. At present, the most widely used fracturing fluid system is a fracturing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/685C09K2208/12
Inventor 陈凯肖春金黄波左家强宋李煜杨峰任占春刘霜陈培胜陈磊苏权生
Owner CHINA PETROLEUM & CHEM CORP
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