Shale gas well production stage division method

Abstract

The invention discloses a shale gas well production stage division method, and relates to the technical field of natural gas extraction. The method comprises the following steps: 1, obtaining production data, and obtaining related data of a gas well; 2, a gas well production mode is judged, and gas well production stages are divided; 3, a drainage and mining stage, a sand-carrying production stage, a self-spraying production stage and a suction pressurization stage are included; 4, in the suction pressurization stage, production is kept continuous and stable, the decline speed is small, gas production is mainly adopted, gas is changed into a continuous phase, the water yield is stably reduced, and the whole water yield is in a low level; 5, the gas-liquid ratio tends to be stable along with the change of the gas production rate, and judgment of the final mining reserve is obtained; and 6, dividing of the shale gas well production stages is completed. According to the method for dividing the production stages of the shale gas well, process technology progress is utilized, the production stages are reasonably divided, the production stability of the shale gas well is improved, and the single-well gas production rate and the gas reservoir recovery rate are increased.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation, in particular to a method for dividing production stages of shale gas wells. Background technique [0002] Shale gas refers to organic matter-rich, mature dark mud shale or high-carbon mud shale, which has a certain commercial value due to the adsorption of organic matter or the existence of fractures and matrix pores in the rock, so that it is stored and preserved. shale gas, unconventional natural gas that occurs in organic-rich shale-based reservoir rock series, is continuously generated biochemical or thermogenic or secondary gas The mixture of these can exist in natural cracks and pores in a free state, on the surface of kerogen and clay particles in an adsorbed state, and a very small amount can be stored in kerogen and asphaltenes in a dissolved state. The proportion of free gas is generally 20%~ 85%; [0003] Compared with the production performance characteristics of c...

AI Technical Summary

Problems solved by technology

[0004] The original basis for dividing the production stages of shale gas wells is: according to the law of pressure decline and dynamic characteristics corresponding to the production stages of the gas wells, the multiple stages of the production stages of the gas wells are divided until the life of the gas wells ends; with the progress of new technologies , The advancement of advanced production tools, the use of test-mining integrated tools, sand-bearing production technology and the use of suction booster pumps have changed the relevant laws of pressure decline prediction or production decline prediction in the production decline stage, and correspondingly obtained multiple different There are limitations in the way of dividing the production stages of shale gas wells; therefore, we propose a method for dividing the production stages of shale gas wells

Images