Dual-opening horizontal well cementation and completion construction method

Abstract

The invention discloses a dual-opening horizontal well cementation and completion construction method and belongs to the technical field of drilling engineering. The second-opening horizontal well cementation and completion construction method comprises the following steps of: S1, as for a first opening, drilling to well depth of 750m by use of a 346mm drill bit; S2, as for a second opening vertical hole section, drilling to well depth of 2850m by use of a 222mm drill bit, and as for a second opening inclined hole section and a second opening horizontal section, drilling by use of a 215.9mm drill bit until a whole well is drilled; S3, performing a drafting process; S4, feeding a dual-opening horizontal well cementation and completion inteigrated pipe column device; S5, performing cement injection; S6, injecting 25m<3> cement slurry; S7, injecting 5m<3> clear water and 2m<3> sodium cellulose glycolate insulating liquid; S8, injecting 25-30m<3> potassium chloride solution for replacing the slurry, and feeding a 41.3mm seat seal ball; S9, injecting 60m<3> potassium chloride solution; and S10, performing electrical logging of well cementation quality. The method disclosed by the invention is capable of performing large-amplitude locus adjustment, is high in flexibility, low in well cementation construction difficulty and low in well cementation cost.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a cementing and completion construction method for a second open horizontal well. Background technique [0002] Drilling in oil and gas production mainly includes drilling engineering and well completion engineering. Drilling engineering is the drilling process from spud to drilling to the target layer of exploration and development, and the complete well footage is drilled. Drilling refers to the start of drilling with the first drill bit after entering the conduit or each layer of casing. Drilling can be divided into the first spud, the second spud, the third spud, etc. A well is drilled from zero depth, which is called the first spud, referred to as the first spud; spud after the surface casing is cemented, called the second spud, referred to as the second spud; Drilling is called the third drilling, referred to as three drilling; if the technical casing has tw...

AI Technical Summary

Problems solved by technology

Three-cut drilling method: there is a long intermediate completion time, a long drilling and completion cycle, and a long reservoir stimulation cycle. Due to the limitation of the small size of the completion string, it is impossible to implement large-scale space cube deep stimulation on the reservoir, and the reservoir stimulation The effect is limited, and the development cost is high. At the same time, due to the small size of the completion string, it is impossible to implement technical measures such as workover, water shutoff, and repeated fracturing in the horizontal section during later production, which is not conducive to the economical and efficient development of horizontal wells

However, the drilling of the horizontal section starts after the previous cementing, and the size of the drill bit is one step smaller than that of the deviated well section, so it is impossible to use the same size drill bit for the deviated well section and the horizontal section; when the reservoir dip angle, reservoir physical properties When a large change occurs, it can only be adjusted within a small range, and it is impossible to flexibly adjust the trajectory with a large range

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