Preparation method of naphthalene derivative for water shutoff and sand prevention of oil-water oil

Abstract

The invention provides a preparation method of a naphthalene derivative for water shutoff and sand prevention of an oil-water well. The naphthalene derivative is prepared by carrying out sulfonation reaction and condensation reaction on industrial refined naphthalene, 37 wt% of formaldehyde, sodium hydroxide particles, calcium salt, 98wt% of concentrated sulfuric acid and deionized water. Due to the fact that the naphthalene is condensed with the formaldehyde by sulfonation action under the acidic condition, the structure of a polymer is changed and the early strength performance of the polymer is improved, and thus, a final synergistic effect is generated between the diffusion action of the naphthalene derivative and the strength enhancing action of the calcium salt so that the compression strength and the permeability of an artificial borehole wall formed after sand prevention materials are solidified are obviously improved, and the cementing time of water shutoff and sand prevention materials is shortened.

Description

Technical field: [0001] The invention relates to a preparation method of a chemical agent for oilfield water shutoff and sand control, especially naphthalene derivatives. Background technique: [0002] 1. Background of water blocking technology [0003] In the construction process of water plugging operation, the plugging agent selected can be divided into selective plugging agent and non-selective plugging agent. Non-selective plugging agent is suitable for blocking single water layer or high water layer. Commonly used non-selective water blocking agents include resin blocking agents, jelly blocking agents, gel blocking agents, precipitation blocking agents and dispersion blocking agents. Selective water blocking agent is suitable for the water layer where the packer is not suitable to separate the target layer from other oil layers. Selective blocking agent uses the difference between oil and water or the difference between oil layer and water layer to achieve the purpo...

AI Technical Summary

Problems solved by technology

[0005] (1) Completely block the water layer or high water-bearing layer, so for the layers with serious water channeling and relatively high oil saturation, it is easy to cause wrong plugging construction;

[0006] (2) The packer needs to be run in during the construction process, but since most oilfields have entered the middle and late stages of development, the ground stress changes seriously and the casing damage is large, therefore, it is not easy to run in wells with deformed casings Packer

[0008] (1) For the low-temperature sealing layer, the solidification time is long; the performance of the plugging agent is affected by various factors such as formation salinity, pH, etc., which may cause non-solidification or premature aging failure in the formation;

[0009] (2) Most of the selective plugging agents are attached to the wall of the rock channel by adsorption and trapping, and the adhesion is weak, so the effective time is short, and the formation liquid flow rate is too fast, which will cause the plugging agent to fail with the production fluid output

And because it is heated in an oil bath, if any reaction liquid such as acid, alkali, etc. splashes into the oil bath, the oil in the oil bath will quickly generate bubbles at high temperature, the entire reaction process will end, and the experiment needs to be restarted