Blocking technological method of drillable oil layer

Abstract

The invention relates to a blocking technological method of a drillable oil layer, which comprises the following steps: filling sand, leading the blocking to be positioned above the surface of filled sand, washing a well, leading well-washing liquid to enter into a drillable pipe from an oil pipe and return via a sleeve, injecting slurry into the oil pipe, further injecting displacing liquid intothe oil pipe, leading the displacing liquid to push the slurry and the well-washing liquid to descend, leading the slurry to enter into the sleeve below a leather cup seal, blocking the slurry by a signal pipe, filling an annular space between the drillable pipe and the sleeve with the slurry, leading the slurry to enter into a near well area of the blocked oil layer via a bore hole, washing the well in the reverse direction, washing away the excess slurry, waiting for solidification, consolidating the slurry, blocking the blocked oil layer, rotating the oil pipe, disengaging connecting threads of a channel-division joint and a reverse buckling joint, extracting out a slurry pouring tool assembly along with the oil pipe, going down to a milling shoe in the drillable pipe, milling through a blind plug and leading oil flow at the lower oil layer of the blocked oil layer to be communicated and enter into the sleeve for being exploited. The adoption of cement slurry for blocking the layerwith high water content can realize reliable blocking, and the oil well is exploited layer by layer with pertinence, thereby leading the oil layer with low water content to produce oil, leading the oil production of the oil well to be high and having good economic benefits.

Description

technical field [0001] The invention belongs to a water plugging method for an oil-water well, in particular to a drillable oil layer plugging process. Background technique [0002] In some oilfields, there are great differences in the production status of the reserves of each rhythmic layer in the layer, and layer modification is an important measure in the production and operation of the oilfield. Oil well layer modification can increase oil well production. The commonly used layer modification method is to set the packer down to the interlayer between the two layers to form a liquid production channel, seal the high-bearing layer, and let the low-water-bearing layer oil flow out. Due to the aging of oil wells and frequent sealing at the interlayer, the casing is damaged, and the success rate of sealing with packers is getting lower and lower. Many wells that require layered oil production cannot be sealed with packers, and many oil wells can only be sealed with packers. ...

AI Technical Summary

Problems solved by technology

Due to the aging of oil wells and frequent sealing at the interlayer, the casing is damaged, and the success rate of sealing with packers is getting lower and lower. Many wells that require layered oil production cannot be sealed with packers, and many oil wells can only be sealed with packers. Combined production of two or more layers, due to the difference between layers, the oil layer with low water content cannot be developed, resulting in low oil production and poor economic benefits.

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