Method for establishing artificial natural gas migration channel between gas reservoirs

Abstract

The invention discloses a method for establishing an artificial natural gas migration channel between gas reservoirs. The method comprises the following steps of: selecting a production gas reservoir which has a high permeability in the gas reservoir sand body physical properties, that is to say, the permeability is higher than 10mD, from developed gas fields, meanwhile, selecting a gas reservoir to be developed, which is suitable to be developed by adopting the method, in the gas fields or around the gas fields; establishing a construction well; drilling the selected gas reservoir to be developed and a gas reservoir sand body of a developed gas field production gas reservoir in the construction well to form an open hole; according to the gas reservoir physical characteristics of the gas reservoir to be developed and the production gas reservoir, selecting and determining a sand proof well completion mode of the two gas reservoir well sections, and carrying out sand proof well completion on the two gas reservoir well sections; and after the sand proof well completion, punching bridge plugs on the two gas reservoir well sections or in front of the two gas reservoir well sections, that is to say, establishing the artificial natural gas migration channel between the two gas reservoirs. Due to the adoption of the development method, gas reservoirs to be developed, which are selected in offshore developed gas fields or around the offshore developed gas fields, can be economically and effectively developed.

Description

technical field [0001] The invention relates to a method for developing natural gas, in particular to a method for establishing artificial natural gas migration channels between gas reservoirs. Background technique [0002] In or around the developed gas fields in the western South China Sea, there are many small-scale gas reservoirs, abnormally high-pressure gas reservoirs, low-permeability gas reservoirs and high CO content 2 The gas reservoir has not been put into development yet, and its overall reserves are large. Because among the above four gas pools to be developed selected by the present invention, small-scale gas pool development has less recoverable gas volume and offshore drilling and completion investment is relatively high; abnormally high pressure gas pool development has high safety requirements and low permeability gas pools Low production capacity requires drilling more wells and reforming reservoirs, high CO content 2 The development of gas reservoirs re...

AI Technical Summary

Problems solved by technology

[0005]1) Drilling and development of a new production platform or underwater production system, from the construction of the new production platform or underwater production The economical and effective development of selected small-scale gas reservoirs or abnormally high pressure gas reservoirs or low permeability gas reservoirs or high CO2 gas reservoirs in or around the developed offshore gas fields will also cause The existing well pattern and existing production facilities of the developed gas field production platform or subsea production system cannot be utilized

[0006]2) There are no remaining well slots on the production platform of the developed gas field or no remaining subsea wellheads in the subsea production system, and it is impossible to add well slots or increase subsea wellheads, Or when the drilling and development directly from the established production platform or underwater production system cannot be realized due to economic and technical reasons, the selected small-scale gas reservoirs or abnormally high-pressure gas reservoirs or low-permeability gas reservoirs or high CO2 gas reservoirs will not be developed, and the country's precious natural gas resources will be wasted

[0008]4) The development of abnormally high-pressure gas reservoirs and high CO2 gas reservoirs requires very high pressure safety levels and anti-corrosion requirements for relevant materials. High, resulting in a substantial increase in investment in drilling and completion and production facilities, seriously affecting economic benefits

[0009]Currently, in the development of natural gas, there is no construction method involving man-made migration channels

Images