A kind of water-soluble fracturing diversion temporary plugging agent and preparation method thereof

Abstract

The invention relates to a water-soluble temporary plugging diversion agent for fracturing and a preparation method thereof. The temporary plugging diversion agent comprises plant starch, a polymer, an expanding agent and a curing agent, wherein the mass ratio of the plant starch, the polymer, the expanding agent and the curing agent is 4.5:3.5:0.5:1.5. The preparation method comprises steps of mixing the polymer and the plant starch uniformly; adding a mixture of the expanding agent and the curing agent; stirring until the mixture is uniformly mixed to obtain a raw material mixture; preparing the raw material mixture into pie shapes, drying naturally, and granulating into particles having a diameter of 3-6 mm to obtain the temporary plugging diversion agent. The temporary plugging diversion agent has advantages of good solubility, strong adhesivity, good flowback performance, no pollution to the ground stratums, and the like. The temporary plugging diversion agent has high breakthrough pressure and can plug shot holes and highly pervious beds temporally and can pressure to open new cracks.

Description

technical field [0001] The invention relates to a water-soluble fracturing diversion temporary plugging agent and a preparation method thereof, belonging to the technical field of petrochemical industry. Background technique [0002] With the development and production of fracturing wells, the crude oil in the oil drainage area controlled by the fractures produced by the first fracturing has been recovered to a high degree, but the large amount of remaining oil outside the oil drainage area has a low degree of recovery. In order to control water and increase oil production and give full play to the production potential of oil wells, simply adopting conventional fracturing to extend the original fractures can no longer meet the development needs of oilfields to increase and stabilize production. [0003] The new technology of temporary plugging diversion fracturing is to add temporary plugging agent in real time during the fracturing process to temporarily plug old or sanded ...

AI Technical Summary

Problems solved by technology

Aiming at the research of temporary plugging agent in the fracturing process, some research work has been carried out at home and abroad, but there are problems such as expensive raw materials, complicated construction, easy plugging of water-locked oil layers, and great damage to the formation.