A diversion agent for water injection well diversion acidification and preparation method thereof

Abstract

The present disclosure provides a diverting agent for diversion acidizing in water injection wells and a preparation method thereof. The diverting agent for diversion acidizing in water injection wells has a raw material composition including: 3%-6% of ethylenediamine, 12%-25% of bromododecane, 10%-20% of a solvent, 10%-20% of an assistant, 14%-28% of oleic acid, 5%-10% of stearic acid salt, 1%-2% of a dispersing agent and a balance of water. The present disclosure also provides a method for preparing the above-mentioned diverting agent for diversion acidizing in water injection wells. The diverting agent for diversion acidizing in water injection wells of the present disclosure can be used for temporary plugging diverting of acid solution in on-line acidification of water injection wells or in acidification operation of oil reservoir with a greater heterogeneity, which has good compatibility with the acid solution and can be used for temporary plugging of high-permeability zones.

Description

technical field [0001] The invention relates to a diverting agent for acid liquid, in particular to a diverting agent for diverting and acidizing water injection wells, and belongs to the technical field of petroleum exploitation. Background technique [0002] Due to the incompatibility of conventional acid liquid and diverting agent, the existing conventional acidizing diversion diversion process mainly consists of multi-steps: the first is to unload the pipe string, the second is to inject acid, the third is to inject the isolation slug and then inject the diversion agent or diversion agent, and the fourth is to It is to inject spacer fluid and then inject acid solution for acidification, etc. The construction steps are complicated and the on-site operation is difficult. In addition, the particle size of phenolic resin and other granular temporary plugging and diversion agents cannot achieve the ideal temporary plugging and diversion effect due to the limitation of reservo...

AI Technical Summary

Problems solved by technology

[0002] Due to the incompatibility of conventional acid liquid and diverting agent, the existing conventional acidizing diversion diversion process mainly consists of multi-steps: the first is to unload the pipe string, the second is to inject acid, the third is to inject the isolation slug and then inject the diversion agent or diversion agent, and the fourth is to It is to inject spacer fluid and then inject acid solution for acidification, etc. The construction steps are complicated and the on-site operation is difficult

In addition, the particle size of phenolic resin and other granular temporary plugging and diversion agents cannot achieve the ideal temporary plugging and diversion effect due to the limitation of reservoir pore diameter during the acidizing construction process. The hole achieves the ideal effect of temporary plugging and diversion

[0003] Chinese patent application CN104402740A introduces a kind of acidification diverting agent used in the temperature range of 40°C-60°C. The blocking agent uses sodium bicarbonate as an auxiliary agent, and uses diethanolamine and brominated n-butane through condensation reaction, and then with Brominated octadecane is obtained by quaternization reaction. It has good adsorption, can effectively reduce acid fluid loss, and automatically breaks gel when it encounters hydrocarbons after acidification. No research has been done on the viscosity of diverters at acid concentrations below 4%

[0004] In order to solve the shortage of diversion acidizing technology used in the existing heterogeneous sandstone reservoirs in the oilfield, it is urgent to study the acidizing technology suitable for the actual situation of acidizing construction of heterogeneous sandstone reservoirs

Images