Square well bottom drainage design method

Abstract

The invention provides a square well bottom drainage design method. The square well bottom drainage design method comprises the following steps of 1, a square well foundation pit is excavated; 2, water guide blind ditches are formed in the periphery of the bottom of the square well; 3, the water guide blind ditches are backfilled with gravels; 4, a drainage pipe bundle is arranged on the outer side of the square well wall, the bottom of the drainage pipe bundle is connected with the water guide blind ditches, and the top of the drainage pipe bundle is connected with the periphery of the top of the square well wall; 5, a cushion layer is fully poured at the bottom of the square well to seal the bottom and seal and cover the water guide blind ditches; 6, the square well is poured; 7, concrete is backfilled around the well wall of the square well to seal a water body, and the drainage pipe bundle is wrapped in the concrete; and 8, a drainage open trench is built on the periphery of the top of the well wall of the square well, and the drainage pipe bundle is fixed to the trench wall of the drainage open trench. The construction difficulty of a traditional masonry structure square well in a high-water-content stratum can be reduced, and the risk that the square well is damaged by a closed water body in the later period and a wellhead device is flooded due to stratum water seepage can be avoided for a long time.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling and well completion, and in particular relates to a method for draining water at the bottom of a square well. Background technique [0002] Oil drilling square wells are built under the derrick before drilling on land to provide space for wellhead devices, and are also used to collect discharged water and other small amounts of fluids under the drilling floor, with enough space for processing. Its main function is to provide operating space for wellhead devices in drilling and completion processes. [0003] At present, the square well structures used in the exploration and development of land natural gas are generally divided into masonry structures, reinforced concrete structures or hybrid structures. When building a square well in a weak stratum with a high groundwater level, it often faces problems such as long drainage construction period and difficult foundation pit support. Mo...

AI Technical Summary

Problems solved by technology

When constructing a square well in a weak stratum with a high groundwater level, it often faces problems such as long drainage construction period and difficulty in foundation pit support.

Moreover, square wells with masonry structures or square wells with reinforced concrete structures often have leakage, which may cause groundwater to enter the square well, affecting the use and maintenance of wellhead devices

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