Comprehensive mining technology of drowned well

Abstract

The invention discloses a comprehensive mining technology of a drowned well, comprising the step 1: stratum unblocking pretreatment prior to water plugging; step 2: shallow plugging; step 3: deep plugging adjustment; and step 4: hydraulic deep penetration perforating and oil production recovery of an oil well. According to the characteristics of the drowned well, multiple mature technologies are organically comprehensively applied, with the combination of first dredging and subsequent plugging, the problem that no oil is produced after plugging is effectively solved. By first shallow plugging and subsequent deep plugging adjustment and in combination with hydraulic deep penetration perforating, the period of validity of mining is effectively prolonged and the input-output ratio is improved.

Description

technical field [0001] The invention relates to an oil well exploitation technique, in particular to a water flooded well exploitation technique. Background technique [0002] At present, most oilfields in my country have entered the medium-high water-cut period, and after entering the high-water-cut period, the decline in oil production will accelerate. In these high water-cut oilfields, bottom water reservoirs account for a huge number and have abundant reserves. Bottom water reservoirs have thick reservoirs, large water bodies, and abundant natural energy. The most prominent problem in development is how to prevent and restrain bottom water coning. [0003] The practical experience of oilfields at home and abroad shows that the key technology for the development of bottom water reservoirs is to suppress water coning or control bottom water coning, prolong the water-free oil recovery period of oil wells to the greatest extent and control the uniform displacement of bottom...

AI Technical Summary

Problems solved by technology

During the oil production process of the oil well, due to the reduction of pressure and temperature, wax deposition and asphaltene precipitation and formation water scaling will occur in the formation near the wellbore. In addition, the solid phase particles in the formation will migrate with the liquid flow to form pore blockage, which will reduce the seepage capacity of the formation. Decrease, but also lower the cement bond strength, therefore, the outflow of fluid after plugging has become a common problem in the exploitation of flooded wells, so the oil field can only be abandoned, and other paths have been secluded, which has caused great losses to the exploitation of oil.

Even if oil can be produced after plugging, because it only plugs the shallow part, its validity period will be very short, and the oil production is not satisfactory

Moreover, there are many problems in the above-mentioned process, such as that the cement cannot be squeezed in, and the plugging is not good.