Device and method for detecting sanding critical flow velocity of gas well

Abstract

The invention provides a device and a method for detecting the sanding critical flow velocity of a gas well. The device consists of an axial compression system, a gas supply system, a simulation system, a measuring and acquiring system and a sand processing system. The method comprises the following steps of: providing different supply pressure for the simulation system simulating the production state of the gas well by using the gas supply system; measuring parameters such as inlet pressure, outlet pressure, gas flow rate, sand production volume after a certain experimental time and the like to obtain the sanding critical flow rate through a test result; and combining the sanding critical flow rate with the rock core size to solve the sanding critical flow velocity. Thus, the technology for determining the sanding critical flow velocity of the gas well on site is provided. By adopting the device and the method of the invention, as the experimental conditions are similar to the geological conditions of gas pools, the problem of detecting the sanding critical flow velocity under the condition of open hole completion of the gas well is solved accurately, conveniently and economically, and an experimental evidence is provided for directing on-site production of the gas pools.

Description

technical field [0001] The invention relates to a test device for measuring the critical velocity of sand production in a gas well, and also relates to a method for applying the test device. Background technique [0002] For unconsolidated sandstone gas reservoirs, in order to increase the production of gas wells, it is necessary to increase the production pressure difference and increase the flow rate of natural gas in the gas wells, resulting in different degrees of sand production in the gas wells. With the continuation of development, the number of wells producing sand is increasing, and the situation of sand production is becoming more complicated and intensified. Sand production in gas wells shortens the production cycle, reduces production, and even shuts down or scraps gas wells, seriously restricting the potential of gas wells. At the same time, it also rapidly deteriorates mining equipment and surface technology, seriously affecting the efficient and stable product...

AI Technical Summary

Problems solved by technology

The cost of using field tests is too high, and it will cause some damage to the formation near the wellbore; theoretical formulas can only be used to roughly estimate, and the error is large; laboratory tests mostly use small cores for one-dimensional linear flow displacement, which is not representative, and is consistent with the real diameter. There is a certain difference in seepage characteristics

The full-diameter rock core radial permeability measuring instrument that has been used has similarities with the present invention, but its gas source is too small to make the core reach the critical flow rate of sand production, and there is no filter device at the outlet, so it is impossible to identify whether sand is produced

At present, the petroleum industry has not formed a mature device and method for measuring the critical flow rate of sand production in gas wells. Therefore, in order to reasonably determine the production pressure difference and production allocation, it is urgent to develop a device and method for measuring the critical flow rate of sand production in gas wells to guide On-site production

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