A method and device for determining the timing of limiting sand discharge in gas wells

Abstract

The embodiment of the invention provides a method and device for determining the ultimate sand-discharging occasion of a gas well. The method comprises the steps that basic parameters, gas flowing rates and wellhead oil pressure of the target gas well and a reservoir are obtained; according to the basic parameters, the gas flowing rates and the wellhead oil pressure, the height of accumulated sandin a production pipe column of the target gas well is determined; the first relation between the wellhead oil pressure and the height of the accumulated sand is determined; according to the basic parameters and wellhead static pressure data of the target gas well, the maximum height of the accumulated sand capable of being discharged from the production pipe column under different wellhead staticpressure is determined; according to the maximum height of the accumulated sand and the first relation, the second relation between the maximum height of the accumulated sand and the wellhead oil pressure is determined; and the ultimate sand-discharging occasion of the target gas well is determined according to the second relation. The accuracy of determining the ultimate sand-discharging occasion of the gas well can be improved.

Description

technical field [0001] The application belongs to the technical field of petroleum and natural gas development, and in particular relates to a method and device for determining the timing of limiting sand discharge in a gas well. Background technique [0002] Fractured tight sandstone gas reservoirs refer to gas reservoirs with well-developed natural fractures, low matrix porosity and poor permeability. This type of gas reservoir is generally characterized by high temperature, high pressure, and high yield, and currently faces the problem of sand production in gas wells. However, after sand production in gas wells, it is easy to accumulate in the production string, which seriously affects the production of natural gas. Therefore, sand removal measures are required for sand production gas wells in order to remove the sand accumulation at the bottom of the well and restore the natural gas production of the gas well. [0003] However, the timing of implementing sand removal me...

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Problems solved by technology

[0003] However, the timing of implementing sand removal measures is generally affected by factors such as the degree of sand accumulation in the gas well, the size of sand grains, the production of natural gas, and the average pressure of the gas reservoir. When the sand height reaches a certain level, the sand accumulation in the gas well cannot be discharged by relying on the energy of the natural gas in the gas reservoir. As the sand accumulation height gradually increases, the natural gas production of the gas well gradually decreases, until the sand is blocked and the well is shut down, causing the gas well to be scrapped

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