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Starch/nanometer SiO2 composite gel, and preparation method and application thereof

A composite gel and nanotechnology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor viscoelasticity, low compressive strength, and difficulty in meeting requirements, and achieve high compressive strength, thermal Good stability, strong adhesion and sealing effect

Active Publication Date: 2017-04-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, polymer gels have low compressive strength and poor viscoelasticity, and it is difficult to meet the field requirements for well killing gels

Method used

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  • Starch/nanometer SiO2 composite gel, and preparation method and application thereof
  • Starch/nanometer SiO2 composite gel, and preparation method and application thereof
  • Starch/nanometer SiO2 composite gel, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Use a balance to weigh an appropriate amount of tap water and add it to the beaker. Place the beaker under the stirrer, and the bottom of the stirring rod is about 1 cm from the bottom of the beaker. Turn on the DW-3 digital display electric stirrer switch, adjust the stirring speed to about 400r / min, make the water form a vortex, and then weigh a certain amount of thiourea and nano-SiO with an analytical balance 2 , cornstarch and partially hydrolyzed polyacrylamide were added to the beaker at a constant speed. Continue to stir until the polymer is completely dissolved (generally take 4h of stirring). Then add a certain amount of cross-linking agent chromium acetate, stir and mix evenly, and place it in a constant temperature oven at 70°C for reaction to form a gel.

[0041] Among them, starch / nano-SiO 2 The formulation of the composite gel and its elastic modulus and viscous modulus are shown in Table 1.

[0042] Table 1 Starch / nano-SiO 2 Formulation of composite...

Embodiment 2

[0051] Its preparation method is with embodiment 1; Difference is starch / nano-SiO 2 In the formula of the composite gel, the mass percent of cornstarch is 5%. Table 3 and Table 4 are respectively starch / nanometer SiO 2 Viscoelasticity and compressive strength data of the composite gel.

[0052] Table 3 Starch / nano-SiO 2 Formulation of composite gel and its elastic modulus and viscous modulus

[0053]

[0054] Among them, G' represents the elastic modulus, and G" represents the viscous modulus.

[0055] It can be seen from Table 3 that when the amount of corn starch is 5%, SiO 2 The dosage of 3% is the critical value, and the viscoelastic modulus of the composite gel does not increase significantly above this dosage.

[0056] Table 4 Starch / nano-SiO 2 Pressure resistance of composite gel

[0057]

[0058] As can be seen from Table 4, the composite gel prepared by formula C0 (SiO 2 = 0%, corn starch = 5%) has the highest pressure bearing capacity, up to 0.4028MPa m...

Embodiment 3

[0060] Its preparation method is with embodiment 1; Difference is starch / nano-SiO 2 In the formula of composite gel, the mass percent of cornstarch is 0%, 0.5%, 1% and 7%; Nano-SiO 2 The mass percentage is 3%. Table 5 and Table 6 are respectively starch / nanometer SiO 2 Viscoelasticity and compressive strength data of the composite gel.

[0061] Table 5 Starch / nano-SiO 2 Viscoelasticity of composite gels

[0062]

[0063] Among them, G' represents the elastic modulus, and G" represents the viscous modulus.

[0064] Table 6 Starch / nano-SiO 2 Pressure resistance of composite gel

[0065]

[0066] The starch / nanometer SiO that the embodiment of the present invention 1-3 prepares 2 The composite gel has the characteristics of high strength, good elasticity, good toughness, good adhesion, and good air tightness. Therefore, in the process of drilling, completion and workover, it can play a lot of well killing and sealing functions, can effectively isolate the killing fl...

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Abstract

The invention discloses starch / nanometer SiO2 composite gel, and a preparation method and application thereof. The starch / nanometer SiO2 composite gel is prepared from the following ingredients in percentage by mass through being metered by the mass of the composite gel: 1 to 4 mass percent of partially hydrolyzed polyacrylamide, 0.1 to 0.4 mass percent of chromium acetate (cross linking agents), 0.05 to 0.2 mass percent of thiourea, 0.5 to 5 mass percent of nanometer SiO2, 0.5 to 7 mass percent of corn starch and the balance water. The composite gel provided by the invention has the advantages that the pressure-resistant intensity and the viscoelasticity are high; the excellent adhesive force and sealing effects are achieved on a sleeve; and the starch / nanometer SiO2 composite gel is particularly applicable to medium-low-temperature oil-gas reservoirs.

Description

technical field [0001] The invention relates to the field of oil and gas field drilling and completion, in particular to a starch / nanometer SiO 2 Composite gel and its preparation method and application. Background technique [0002] The development of oil and gas fields requires drilling, well completion, and workover operations. Conventional well killing fluids are prone to leakage and cause great damage to the formation. In order to solve the actual problems on site, in recent years, petroleum workers have conducted research on technologies such as low-damage and anti-leakage killing fluid, gel plugging technology, snubbing operation, and underbalanced drilling and completion. The above technologies have their own advantages. shortcoming. Among them, underbalanced drilling, also known as negative pressure drilling, means that during the drilling process, the drilling fluid acts on the hydrostatic pressure at the bottom of the well, the circulating pressure drop and the ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/514C08J3/075C08L3/02C08L33/26
CPCC08J3/075C08J2303/02C08J2433/26C09K8/035C09K8/514
Inventor 林梅钦孙斐斐杨子浩董朝霞陈明晓
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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