Horizontal well cementation and completion integrated pipe string device for secondary spudding

Abstract

The invention discloses a horizontal well cementation and completion integrated pipe string device for secondary spudding and belongs to the technical field of drilling engineering. The horizontal well cementation and completion integrated pipe string device for secondary spudding comprises a casing pipe, a pipe string positioned in the casing pipe, ball-actuated sliding sleeves, a differential-pressure sliding sleeve, at least three open hole packers and a float shoe, wherein the pipe string comprises a vertical section, an inclination section and a horizontal section from top to bottom, and the ball-actuated sliding sleeves, the differential-pressure sliding sleeve, the open hole packers and the float shoe are arranged on the horizontal section. The horizontal well cementation and completion integrated pipe string device for secondary spudding is characterized by comprising a float collar and a self-packing ball seat, the ball-actuated sliding sleeve is arranged between each two adjacent open hole packers, and the pipe string is in screwed connection with the float shoe, the float collar, the self-packing ball seat, the differential-pressure sliding sleeve, the open hole packers and the ball-actuated sliding sleeves sequentially from bottom to top. The horizontal well cementation and completion integrated pipe string device for secondary spudding has the advantages that suspension packers are not required; when the pipe string is down to reach a predetermined well depth, the well is cemented and reservoir reformation is conducted directly after cement slurry cementation, so that safety is greatly improved; drilling speed can be increased effectively, well drilling and completion periods are shortened, cost of development is reduced and oil recovery is improved.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to an integrated cementing and completion pipe string device for two horizontal wells. Background technique [0002] Drilling in oil and gas production mainly includes drilling engineering and well completion engineering. [0003] 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. [0004] 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 tec...

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

[0010] The open-hole horizontal well completion staged fracturing and acidizing tool string disclosed in this patent document has a rather complicated structure. There is a hanging packer on the structure. The tool string is suspended on the upper casing, and the upper part has a The hydraulic anchor is fixed and equipped with a hydraulic release tool. After the pipe string is run into the predetermined well depth, the tool needs to be set and suspended, then the running tool is pulled out, and the tie-back tool is run in to carry out reservoir stimulation; During the running of the pipe string, the hanging packer is affected by various factors in the well, so it is easy to work ahead of time, easily cause safety accidents, and even lead to the scrapping of the well; low drilling speed, long drilling and completion period, high development cost and recovery In addition, the internal diameter of the tool is small, and if sand plugging occurs during reservoir stimulation, there are few treatment methods and high treatment costs, which seriously affect the stimulation effect, and even cause the gas well to be scrapped

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