Layered fracturing and sand control method

Abstract

The invention provides a layered fracturing and sand control method. The layered fracturing and sand control method comprises the following steps that an oil reservoir is divided into a first permeability oil reservoir and a second permeability oil reservoir; the first permeability oil reservoir is sealed and blocked, and fracturing and sand control are conducted on the second permeability oil reservoir; and after fracturing and sand control of the second permeability oil reservoir are completed, blocking removing is conducted on the first permeability oil reservoir, and fracturing and sand control are conducted on the first permeability oil reservoir. According to the layered fracturing and sand control method, the oil reservoir is divided into the first permeability oil reservoir and the second permeability oil reservoir, and layered fracturing and sand control is conducted on the first permeability oil reservoir and the second permeability oil reservoir, by combining of pitching temporary plugging and fracturing sand control, the oil reservoir with low permeability is fractured and filled with a corresponding sand-control support agent, and the fracturing and sand control effects of the oil reservoir with low permeability are improved; meanwhile, the reservoir with high permeability can be filled effectively through a sand control agent, and the difference of permeability between layers is balanced; and in a zone near a well, a large thickness sand retaining well wall is formed, a high conductivity oil flow channel is established, the fracturing and sand control effects are improved, and the production efficiency of the oil well is improved.

Description

technical field [0001] The application belongs to the technical field of petroleum exploitation, and in particular relates to a layered fracturing sand control method. Background technique [0002] In the process of oil exploitation in unconsolidated sandstone reservoirs and heavy oil reservoirs, the sand production of oil and gas wells has become an important issue that affects the production of oil wells. As a complex fault-block oilfield, Liaohe Oilfield has many types of reservoirs, poor diagenesis, high shale content, loose formation cementation, combined with steam injection development of heavy oil and super heavy oil, the sand production of oil wells is particularly serious. According to the statistical data in 2008, Liaohe Oilfield put into development a total of 65 oilfield blocks, including 42 sand producing blocks and more than 6,500 sand producing oil wells. This seriously affects the normal production of oil wells, resulting in a decline in oil and gas well pr...

AI Technical Summary

Problems solved by technology

However, since the fracturing sand control technology usually requires measures to leave resin sand plugs in the wellbore to block the perforation blastholes in the later stage to improve the sand control effect, the traditional layered fracturing sand control process takes a long time to operate and requires repeated operations. When the fracturing unit is used for the first time, it may be necessary to fill the well with sand and wash the well after fracturing, or it is necessary to continuously lift and release the pipe string and disassemble the wellhead device. The construction is difficult, complicated and the construction cost remains high.

Images