Construction method for two-section horizontal well

Abstract

The invention discloses a construction method for a two-section horizontal well. The construction method comprises the following steps of: for the first section, drilling to 700-800 m of the well depth using a 346 mm drill bit; for the second straight well section, drilling to 2800-2900 m of the well depth using a 222 mm drill bit, and for an inclined and horizontal well sections of the second section, drilling to the whole well depth using a 215.9 mm drill bit and thus finishing drilling; carrying out a drifting process; lowering a well cementing and completion integrated tubular column device for the second-section horizontal well, and circulating mud by more than 1.5 cycles; injecting 1.4-1.5 kg / m<3> of leading cement slurry; injecting 17-25 m<3> of cement slurry; injecting 5 m3 of clear water, and 2 m<3> of sodium carboxymethylcellulose spacer fluid; injecting 25-30 m<3> of potassium chloride solution instead of mud, and throwing in one 41.3 mm setting ball; injecting 50-60 m<3> of potassium chloride solution; carrying out electrical logging on the well cementing quality; and carrying out fracturing construction inspection. The construction method for a two-section horizontal well has the advantages that the speed of drilling is improved, adjustment can be achieved in case of a great change in the dip angle of a reservoir stratum, and high flexibility.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a construction method for a double-opening 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 two or three layers, the...

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, there are following defects: 1. The drilling construction of the horizontal section begins after the previous well cementing, and the drill bit size is one step smaller than that of the deviated well section, so it is impossible to carry out the drilling operation with the same size drill bit in the deviated well section and the horizontal section; 2. When the dip angle of the reservoir and the physical properties of the reservoir change greatly, it can only be adjusted within a small range, and it is impossible to flexibly adjust the trajectory with a large range; When the reservoir changes greatly, it is impossible to drill a hydrocarbon channel in the oil-gas-rich reservoir and change the drilling design.

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