Volume fracturing method for reservoir well section under high-density mud drilling well and application of volume fracturing method

Abstract

The invention discloses a volume fracturing method under a reservoir well section high-density slurry well and application thereof, and the method comprises the following steps: when the direction of a well drilling induced fracture is inconsistent with the direction of an artificial fracture, firstly injecting low-viscosity slick water to make the fracture, then injecting a temporary plugging agent to plug the fracture end, and finally injecting the low-viscosity slick water in a large displacement; and when the trend of the well drilling induced fracture is consistent with the trend of the artificial fracture, low-viscosity slick water is injected in a large-displacement mode to make the fracture. According to the situation that the directions of the well drilling induction crack and the artificial crack are consistent and inconsistent, measures such as in-crack temporary plugging and a variable displacement process are adopted, when the directions of the well drilling induction crack and the artificial crack are inconsistent, the flow conductivity of the induction crack is improved, and the oil and gas supply capacity of the main crack is enhanced; when the trends are consistent, high-density mud is promoted to settle at the bottoms of the cracks, and the influence of mud rolling on main crack expansion is avoided, so that the reservoir transformation effect is improved under the reservoir well section high-density mud drilling condition, and finally efficient development of unconventional oil and gas reservoirs is achieved.

Description

technical field [0001] The invention belongs to the field of fracturing, and in particular relates to a volume fracturing method under high-density mud drilling in a reservoir well section and an application thereof. Background technique [0002] With the increasing shortage of oil and gas resources in my country, the development of tight oil and gas such as shale oil and gas is imminent. When drilling high-pressure unconventional reservoirs, in order to reduce risks such as well kicks, high-density mud with barite added is often used according to the site. Although the high-density barite mud is beneficial to ensure the safety of drilling, the high-density mud can easily lead to formation fracture and drilling-induced fractures, thereby guiding a large amount of high-density mud to seep into the reservoir, and may even enter the deep reservoir, resulting in layer damage. [0003] It is worth noting that due to the low porosity and low permeability of unconventional reserv...

AI Technical Summary

Problems solved by technology

When the direction of drilling-induced fractures is inconsistent with the direction of artificial hydraulic fractures, the drilling-induced fractures are filled with high-density mud after fracturing, and the ability of oil and gas in the flank direction of the main fracture to supply oil and gas to the hydraulic fractures will be greatly reduced, which will greatly reduce the hydraulic pressure. oil and gas production; when the direction of drilling-induced fractures is consistent with that of artificial fractures, a large volume of fracturing fluid tends to roll up a large amount of high-density mud during fracturing, and scours to the front edge of hydraulic fractures, thereby hindering the expansion of fractures, resulting in high construction pressure and Large fluctuations bring great risks to sand fracturing. Therefore, high-density mud can easily affect subsequent reservoir stimulation operations

Images