Acid Thicker Agent Oilfield Chemicals Polyacrylamide High Temperature Resistant

Oil Field Acid Thicker Agent Powder Polyacrylamide MW 6-36 Million Flocculant

Introduction

Gelled acids have been used for many years to improve the effectiveness of fracture acidizing treatments. Gelling the acid allows greater fracture penetration by increasing fracture width, slowing reaction rate, and reducing fluid loss. Unfortunately, most commonly used gelling agents have limited acid stability and are effective only at low-temperature applications. Newer, more acid-stable polymers show promise for use at higher temperatures. When evaluating acid gelling agents, a number of important factors must be taken into consideration. These include the following.

Acid Stability. How long is viscosity maintained in the treating acid at various temperatures? Efficiency. What concentration of gelling agent is required to achieve a desired viscosity? Condition of Spent Acid. Is the viscosity of the spent acid low enough to ensure cleanup and are insoluble reaction products formed upon spending of the acid?

Acid Stability

For an acid gelling agent to be effective, it must be sufficiently stable to retain its viscosity in acid under downhole spending conditions. Tests were performed in which gelling agents were mixed with preheated, ]5 % HCl to compare the stability of various acid thickeners. After 1 minute, the initial viscosity was measured with a Fann 35 viscometer at a shear rate of 511 seconds . While maintaining the solution at the test temperature, additional viscosity measurements were made over a period of 1 hour. Table 1 describes the gelling agents that were evaluated, while Figs. 1 and 2 contain the test results. Tests performed at 100 degrees F demonstrate that gelling agents such as GG, hydroxypropyl guar gum (HPG), HEC, and CMHEC have limited stability in 15 % HCl. Consequently, their use at temperatures above 125 degrees F is not recommended.

Acidizing is one of the main measures to increase oil and gas output, using the principle of acid has corrosion and dissolution to rock cement, formation pore and fracture. Acidification can restore or improve the permeability of the formation pαe and fracture. The addition of acid thickener can improve the viscosity of acid, reduces the activator acid diffusion velocity, increases acid operating distance, slows down the acid rock reaction time, increases the width of the cracks, improves the acidizing effect. and achieves the goal of improvement of the formation permeability.

Acid Thickener produced by Raitte Group is homopolymerization type cationic polymer, white amorphous powder. It has high polymerization conversion rate, high molecular weight. And, it has properties of dissolves fast, high temperature-resistant, shear-resistant, and anti-degradability.