Instant water-in-oil resistance-reducing agent and preparation method thereof

A water-in-oil, drag-reducing agent technology, applied in chemical instruments and methods, drilling compositions, etc., to achieve the effects of good stability, good compatibility and less dosage

Inactive Publication Date: 2016-03-23
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention aims to propose an instant water-in-oil type drag reducer to solv

Method used

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  • Instant water-in-oil resistance-reducing agent and preparation method thereof

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Embodiment 1

[0028] According to the mass ratio of 6:1:3, 48.0g of monomer monomer acrylamide, 8.0g of methacrylic acid, and 24.0g of 2-acrylamide-2-methylpropanesulfonic acid were weighed with a precision balance, and dissolved in 120.0 g of water, and keep stirring until the solution becomes clear after the monomer is completely dissolved, then use Na 2 CO 3 The pH value was adjusted to about 7.0, and the aqueous phase was prepared successfully.

[0029] Take 60.0 g of white oil with a precision balance, and add 3.0 g of compound surfactant under stirring to make the two completely dissolve. The compounded surfactant is prepared by mixing Span-80 and Tween-80 at a ratio of 7:3, and the compounded emulsifier has an HLB value of 7.5.

[0030] Then, first pour the oil phase into a 250mL three-neck flask, place the three-neck flask in a constant temperature water bath at 20°C, and keep stirring; then slowly drop the water phase into the oil phase to fully emulsify it to form a microemulsio...

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Abstract

The present invention provides an instant water-in-oil resistance-reducing agent and a preparation method thereof. The resistance-reducing agent is synthesized by inverse emulsion polymerization. In particular, the preparation method comprises the steps of dissolving a water-soluble monomer into an aqueous phase; dispersing the monomer into a nonpolar liquid to form a water-in-oil emulsion by an emulsifier while stirring, wherein an initiator performs initiation to carry out a polymerization reaction; basic composition of an aqueous phase is acrylamide, methacrylate and 2-acrylamide-2-methylpropanesulfonic acid; and basic composition of an oil phase is white oil and a mixed surfactant. The water-in-oil resistance-reducing agent synthesized by the preparation method is an ivory emulsion liquid which is a high molecular polymer; the agent has good stability and a certain degree of fluidity, and can be directly used and rapidly dissolved in water. By using the resistance-reducing agent to prepare a slippery water fracturing fluid, the agent has the characteristics of small dosage, high temperature resistance, salt resistance and shearing resistance; the agent is suitable for an online continuous mixing technological process; the resistance-reducing rate can reach 69.6%; and damage to a reservoir is very low.

Description

technical field [0001] The invention belongs to the technical field of tight shale reservoir transformation of oil and gas wells, and in particular relates to an instant water-in-oil drag reducing agent and a preparation method thereof. Background technique [0002] With the great success of shale gas commercial development in foreign countries such as the United States and Canada, my country has been stimulated to enter the upsurge of shale gas development. Hydraulic fracturing has always been the most effective stimulation technology in the process of oil and gas reservoir exploitation. Conventional oil and gas well reservoir stimulation uses jelly fracturing fluid, while shale gas well reservoir stimulation requires special fracturing fluid, namely slick water fracturing liquid. It is formulated from high molecular or ultrahigh molecular polymer, water and additives, so that it has low viscosity and low friction performance, thereby greatly reducing mining costs and obta...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/882C09K2208/28
Inventor 李风光靳剑霞尹海霞牛增前何志勇
Owner CNPC BOHAI DRILLING ENG
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