High-temperature-resistant and high-salt-resistant fine gel particle as profile control agent as well as preparation method and application of fine gel particle

Abstract

The invention discloses a high-temperature-resistant and high-salt-resistant fine gel particle as a profile control agent as well as a preparation method and an application of the fine gel particle. The preparation method of the fine gel particle comprises the following steps of firstly, adding modified starch, a monomer A, a monomer B, a crosslinking agent, an initiator and an accelerant into a reaction kettle according to a certain ratio; and after finishing the polymerization reaction of the six components to form integrated water-based gel, drying, crushing, granulating, screening and performing other process steps to obtain the fine gel particle. The application method of the high-temperature-resistant and high-salt-resistant fine gel particle is as follows: a certain quantity of fine gel particles prepared by using the preparation method are added into a Bingham fluid, the gel particles can be stably suspended without settling under static and dynamic conditions, and then, the whole fluid is injected to the stratum by means of pumping pressure. By using the high-temperature-resistant and high-salt-resistant fine gel particle and the application method thereof, disclosed by the invention, the construction success rate of the gel particle can be greatly increased, and a favorable deep profile control effect can be achieved.

Description

technical field [0001] The present invention relates to a high-temperature and high-salt micro-gel particle profile control agent, a preparation method of the micro-gel particle profile control agent, and a new application method for plugging strong water channeling channels in high-temperature and high-salt oil reservoirs . Background technique [0002] High-temperature and high-salt oil reservoirs are ubiquitous in my country, such as Zhongyuan Oilfield, and some oil fields in Xinjiang, Shengli, Dagang, Jidong and other oilfields. Most of these oilfields have entered the middle and late stage of development. The oilfields have high water cut, low recovery degree, and great potential for remaining oil. However, due to the characteristics of high temperature and high salinity, the commonly used measures to increase oil production and control water are ineffective. [0003] Taking the Wennan Oilfield of the No. 4 Oil Production Plant of Zhongyuan Oilfield as an example, the ...

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Problems solved by technology

However, many deficiencies were also found during the field implementation: although the gel particles have the advantage of being resistant to abnormal high temperatures, their suspension is poor, and after entering the wellbore, they are easy to accumulate near the blasthole and cause blockage, which affects normal construction. It increased sharply in a short period of time, making the effective period of construction short, and the water absorption profile test showed that it was relatively uniform, which indicated that the gel particles were mainly blocked near the wellbore, and the remaining oil in the low-permeability layer was not well produced.

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