Water plugging and acidification joint operation method for high-water-cut oil well in low-permeability oil field

Abstract

The invention relates to the technical field of oil and gas field production and development, in particular to a water plugging and acidification joint operation method for a high-water-cut oil well in a low-permeability oil field. The method is characterized by including the steps that firstly, a section of high-viscosity suspension is injected at a low displacement with a pump truck to push a water fluid in a stratum to the rear; then, cement slurry is injected into the stratum with a cement truck for plugging a water channeling part; then, a section of high-viscosity suspension is injectedinto the stratum with the pump truck to replace the cement slurry to the rear; finally, acidification liquid is pumped into the stratum with the pump truck to carry out acidification plugging removal, wherein the initial setting time of the cement slurry is longer than 6 hours. The method effectively solves the problems that as a crack is communicated with a water containing zone in acidification, an oil well is communicated with a water injection well or an oil layer is communicated with an edge or bottom water layer through the crack, and consequently the water cut of the oil well rises oreven the oil well floods.

Description

technical field [0001] The invention relates to the technical field of production and development of oil and gas fields, in particular to a method for combined operation of water shutoff and acidification of high water content oil wells in low permeability oil fields. Background technique [0002] Oil well acidizing technology, as an important stimulation measure to relieve clogging near the wellbore and improve formation permeability, has been widely used in the production and development of major oilfields and played an important role, especially in the development of carbonic acid reservoirs. application is more common. However, as the production and development of the oilfield enters the middle and late stages, the energy of the formation is insufficient, and the oilfield adopts water injection and other development methods, which leads to the increase of the water content of the oil well and even the shutdown of production due to water flooding; Formation is clogged, l...

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Problems solved by technology

However, as the production and development of the oilfield enters the middle and late stages, the energy of the formation is insufficient, and the oilfield adopts water injection and other development methods, which leads to the increase of the water content of the oil well and even the shutdown of production due to water flooding; Formation is clogged, leading to a decline in production. Measures such as acidizing and fracturing are needed to improve the seepage capacity of the formation to meet production needs, especially in low-permeability oil fields. In later development, in order to ensure production needs, oil and gas wells need to be acidified , fracturing and other production stimulation measures

However, for oilfields using water injection development method, and oil wells with edge, bottom water or adjacent water injection wells in the reservoir, after acidizing measures, it is easy to lead to better communication of the water-bearing area, resulting in an increase in the water cut of the oil well, and in severe cases It leads to problems such as water flooding, water channeling and even scrapping of oil wells, which seriously affects the production efficiency of the oil field, but the existing acidizing technology cannot avoid this problem well

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