Fracturing inclusion self-dissolving diversion agent and preparation method thereof

Abstract

The invention relates to a fracturing inclusion self-dissolving diversion agent and a preparation method thereof. The diversion agent is prepared by using 10-15 parts of guanidine collagen powder, 30-40 parts of ferric trichloride, 30-40 parts of alumina, 1-2 parts of sodium bicarbonate, 8-10 parts of ammonium persulfate, 1-2 parts of potassium ferricyanide and 1 part of gamma-aminopropyltriethoxysilane, has an inclusion form and is spherically granular in shape. The preparation method of the diversion agent comprises the following steps: sequentially dissolving the guanidine collagen powder, the ferric trichloride, the alumina, the sodium bicarbonate, the ammonium persulfate and the potassium ferricyanide in water according to above formula proportions at room temperature, stirring for 5min, carrying out drying caking of the above obtained solution, crushing, milling, spraying the surface of ammonium persulfate with the gamma-aminopropyltriethoxysilane coupling agent, wrapping the external layer of ammonium persulfate crystals by the above prepared powder to form spherical particles, and drying the particles to prepare the diversion agent. The diversion agent has a gel breaker inclusion form, has a self-dissolving capability, and does not need a gel breaking degradation agent in the construction.

Description

technical field [0001] The invention relates to an inclusion self-dissolving diversion agent for oil well fracturing and a preparation method thereof. Background technique [0002] Conventional fracturing fractures generally extend along the direction of the maximum horizontal principal stress. Due to the influence of injection-production well patterns, the extension length of fractures cannot be excessively increased, so the volume of conventional fracturing stimulated reservoirs is limited. In order to increase the drainage area of ​​the oil well, the diversion fracturing technology can be used to open fractures along other directions while the injection-production well pattern remains unchanged, thereby increasing the production of the oil well. The performance of the diverting agent plays a decisive role in the successful implementation of diverting fracturing. [0003] At present, the commonly used diverting agents are: suspension diverting agents, whose disadvantages ...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used diverting agents are: suspension diverting agents, whose disadvantages are that it is difficult to form a large pressure difference resistance due to turbulent flow and blast hole deformation, the plugging efficiency is low, and filter cakes cannot be formed; underground cross-linking diverting agents have the disadvantages Because a small dose cannot reach the required pressure, a large dose will cause new damage. Although a filter cake can be formed, the underground reaction is unstable and cannot reach the required strength; the once-crosslinked particle diverting agent on the ground is characterized by its own strength Large, but the plugging efficiency is low, and the fracturing fluid fluid loss is large; the plugging ball diversion agent is characterized by high strength and small deformation, but it is easy to fall off, low plugging efficiency, and cannot be self-degraded