Online fracturing fluid and preparation method therefor

Abstract

The invention relates to online fracturing fluid and a preparation method therefor. The online fracturing fluid contains the ingredients in parts by mass: 0.8-5 parts of agent A, 0.2-1 part of agent B and 94-99 parts of water; the agent A contains the ingredients in parts by mass: 10-20 parts of chitin, 10-20 parts of starch, 5-20 parts of acrylamide, 2-5 parts of bioactivator, 0.1-1 part of sugar, 0.1-0.5 part of sodium polyaspartate, 10-20 parts of environment-friendly solvent and 13.5-62.8 parts of water; and the agent B contains the ingredients in parts by mass: 5-20 parts of alkaline proteinase, 10-20 parts of bioactivator, 5-10 parts of EDTA-4Na, 0.1-0.2 part of sodium ethylenediamine disuccinate, 0.5-1 part of sodium polyaspartate, 0.2-1 part of sodium acetate, 0.5-1 part of sodium lactate, 0.5-1 part of potassium lactate, 0.5-1 part of sugar, 5-10 parts of ethanol and 34.8-72.7 parts of water. The online fracturing fluid has the characteristics that online continuous preparation is achieved, the operation is simple, the working concentration is low, the viscosifying speed is high, the sand carrying performance is good, the friction drag is low, the damage is low, the online fracturing fluid is heat-resistant and shear-resistant, the viscosity of flowback fluid is low, the applicable range is wide, the cost is low, the production increase effect is good, and the like.

Description

technical field [0001] The invention relates to a formulation and preparation of a fracturing fluid in an oilfield fracturing process, in particular to an online fracturing fluid and a preparation method thereof. technical background [0002] At present, for low-permeability and ultra-low-permeability oil fields, fracturing has become one of the most commonly used and most effective stimulation measures for oil well stimulation and water well injection, and fracturing fluid is an important part of the process of fracturing and stimulation in oil and gas fields. [0003] Water-based fracturing fluid has the advantages of low cost and high safety, and is currently the most widely used. Domestic water-based fracturing fluid accounts for more than 90% of the entire fracturing fluid system. The main water-based fracturing fluids include the following methods: 1. Polymer fracturing fluid; 2. Viscoelastic fracturing fluid; 3. Clear water fracturing. [0004] Among them, the polym...

AI Technical Summary

Problems solved by technology

[0007] 1. The above-mentioned fracturing fluids are all prepared first, and then applied. The time and procedures are relatively cumbersome, requiring a lot of time and cost, and the efficiency is low.

[0008] 2. The defects of cross-linked fracturing fluid system construction are incomplete gel breaking, the gel is easy to exist in the oil reservoir, the gel breaking is not complete, and the residue remains in the fracture, which seriously reduces the permeability of the proppant filling layer and leads to fracturing The effect becomes worse

[0009] 3. Polymer fracturing fluid cannot be constructed due to special circumstances. The prepared fracturing fluid and cross-linking fluid will expire and deteriorate, resulting in a large amount of waste. It will also cause difficulties in waste liquid treatment and put pressure on the surrounding environment.