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Modified nano-montmorillonite and preparation method thereof, polymer fracturing fluid synergist and preparation method and application of polymer fracturing fluid synergist

A nano-montmorillonite and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high cost, low cross-linking efficiency, high residue content, etc., to reduce dosage, improve consistency and viscosity Elastic performance and cost reduction effect

Pending Publication Date: 2022-04-26
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the current research on fracturing fluid can improve its current situation and shortcomings, there are still some shortcomings such as low scope of application, high cost, and inability to be applied on a large scale.
[0005] At present, some agents have been rapidly developed and applied due to their good temperature resistance, but they have problems such as high residue content, poor shear resistance, and low crosslinking efficiency to varying degrees.
In recent years, some scholars have carried boric acid on the surface of reactive nano-silica through surface modification technology, and developed a series of nano-crosslinking agents with body structure. Shear performance, viscoelastic performance, gel breaking performance and other advantages, but it has poor water dispersion, and the viscosity of the crosslinking system drops rapidly under the condition of high temperature (such as 75°C), and the temperature resistance is not good. and other problems, which will limit its application in medium and high temperature deep wells to a certain extent

Method used

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  • Modified nano-montmorillonite and preparation method thereof, polymer fracturing fluid synergist and preparation method and application of polymer fracturing fluid synergist
  • Modified nano-montmorillonite and preparation method thereof, polymer fracturing fluid synergist and preparation method and application of polymer fracturing fluid synergist
  • Modified nano-montmorillonite and preparation method thereof, polymer fracturing fluid synergist and preparation method and application of polymer fracturing fluid synergist

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0049] 1) In a three-necked flask, add 10 g of Na-MMT to a beaker with deionized water at a mass ratio of 1:20, and stir the montmorillonite aqueous solution at 70°C to make it Uniformly dissolved in deionized water to obtain a sodium-based montmorillonite aqueous solution;

[0050] 2) Measure 6g of dodecyltrimethylammonium chloride and dissolve it in 100ml of deionized water to obtain an aqueous modifier solution;

[0051]3) Slowly and uniformly add 100ml of modifier aqueous solution to 100ml of sodium-based montmorillonite aqueous solution, then place in a water bath, heat to 80°C, adjust the pH value to 7, and perform ion exchange reaction for 8h under a nitrogen atmosphere. Then, the prepared reaction product was suction-filtered, washed, dried in a vacuum oven at 80° C. for 24 hours, ground after it was completely dried, and sieved to obtain modified nano-montmorillonite.

Embodiment 1

[0053] This embodiment provides a polymer fracturing fluid synergist, based on the total weight of the polymer fracturing fluid synergist, its raw material composition includes: 0.1% of the modified nano-montmorillonite obtained in Preparation Example 1 , dispersant sodium dodecylbenzene sulfonate SDBS 0.02%, hydrophobic polyacrylamide polymer (HMPAM) 0.2%, and the balance of water.

[0054] Measure the test water to prepare the amount of fracturing fluid according to the formula, and pour it into the mixer. Take the amount of required additives according to the formula and set aside. Adjust the speed of the agitator until the vortex formed by the liquid can see the top of the middle shaft of the agitator blade. Add the modified nano-montmorillonite, dispersant sodium dodecylbenzene sulfonate, and hydrophobic polyacrylamide polymer (HMPAM) in sequence in order to avoid the formation of fish eyes, and adjust the speed at all times to ensure The vortex state is reached. After...

Embodiment 2

[0056] This embodiment provides a polymer fracturing fluid synergist, based on the total weight of the polymer fracturing fluid synergist, its raw material composition includes: 0.2% of the modified nano-montmorillonite obtained in Preparation Example 1 , dispersant sodium dodecylbenzene sulfonate SDBS 0.02%, hydrophobic polyacrylamide polymer (HMPAM) 0.2%, and the balance of water.

[0057] Measure the test water to prepare the amount of fracturing fluid according to the formula, and pour it into the mixer. Take the amount of required additives according to the formula and set aside. Adjust the speed of the agitator until the vortex formed by the liquid can see the top of the middle shaft of the agitator blade. Add the modified nano-montmorillonite, the dispersant sodium dodecylbenzenesulfonate, and the hydrophobic (dodecyl) polyacrylamide polymer (HMPAM) in order to avoid the formation of fish eyes. And adjust the speed at all times to ensure the best vortex state. After ...

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Abstract

The invention discloses modified nano montmorillonite and a preparation method thereof as well as a polymer fracturing fluid synergist as well as a preparation method and application of the polymer fracturing fluid synergist. The modified nano montmorillonite comprises nano montmorillonite and a modified group; the nano montmorillonite is Na-montmorillonite; and the modified group is selected from C12-C18 aliphatic chain quaternary ammonium salt. The viscosity of the hydrophobic association type polymer can be obviously improved, and the sand-carrying performance of a fracturing fluid system is enhanced. The invention has the advantages of simple preparation process, low dosage of medicament, simple preparation method, good temperature resistance and shear resistance and the like, can be prepared at normal temperature within a short time, has good temperature resistance and shear resistance, and can still be higher than 90mPa. S after being sheared for 90min at the shear rate of 170s <-1 > at the temperature of 90 DEG C. The modified nano montmorillonite is introduced, so that the property of a polymer in the fracturing fluid is improved, the elastic modulus is enhanced, and the overall performance is better.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and specifically relates to a modified nano-montmorillonite and a preparation method thereof, a polymer fracturing fluid synergist, a preparation method and application thereof. Background technique [0002] With the development of oil and gas reservoirs, the stimulation of low-permeability reservoirs has increasingly become the main development field, so the fracturing technology has become an important production increase measure for oil and gas field development. As a working fluid for fracturing reconstruction, low-damage and high-efficiency fracturing fluid has become a hot spot and development trend in fracturing fluid research. The viscoelastic surfactant (VES) fracturing fluid developed and applied gradually since the 1990s has the characteristics of good viscoelasticity, no residue and low damage. The main research object. However, viscoelastic surfactant fracturi...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/882C09K8/685C09K8/887
Inventor 陈士勇赵莎莎马玉陶震吴文炜
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD