Throttling device inlet pressure calculating method and device for down-hole throttling gas well
A technology of inlet pressure and calculation method, applied in calculation, wellbore/well components, instruments, etc., can solve the problems of gas well dynamic analysis difficulty, inability to predict choke inlet pressure, etc.
Inactive Publication Date: 2018-06-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
However, when the gas well bottom hole pressure is high and the nozzle flow state is critical flow or supercritical flow, the flow rate of the mixture passing through the restrictor and the pressure difference between the inlet and outlet of the restrictor are no longer in a one-to-one relationship. The pressure at the inlet of the restrictor cannot be predicted by the momentum conservation equation in the counter-flow direction based on the outlet pressure of the restrictor and the flow rate of the mixture
This brings difficulty to the prediction of the bottomhole flow pressure of downhole choke gas wells and the dynamic analysis of gas wells
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[0027] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments. It should be understood that this specific embodiment is only used to illustrate the present invention and is not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art will fall into the appended claims of the present application to the modifications of various equivalent forms of the present invention within the limited range.
[0028] The structural diagram of downhole choke gas well of the present invention is as figure 2 As shown, the schematic diagram of the throttle physical model is shown in image 3 As shown, the gas-liquid mixture flows along the direction of the arrow, position ① is the inlet of the choke, position ② is the throat of the choke, and position ③ is the outlet of the choke. The main parameters involved in calculating the botto...
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The invention relates to a throttling device inlet pressure calculating method and device for a down-hole throttling gas well and belongs to the field of oil and gas well mining. Under the assumed throttling device inlet pressure p1, the corresponding gas-liquid mixture specific volume of the throttling device inlet pressure p1 and the throat pressure p2 (i) is calculated; then the gas-liquid mixture mass M (i) passing through the throat per unit time and corresponding to the throat pressure p2 (i) is calculated through the mixture specific volume, thus, a theoretical value M of the gas-liquidmixture mass passing through the throat per unit time is obtained, and the throttling device inlet pressure p1 is repeatedly adjusted till the theoretical value M and an actual value M0 of the gas-liquid mixture mass passing through the throat per unit time meet certain precision; and finally, the throttling device inlet pressure p1 is obtained. The essence of the throttling device inlet pressurecalculating method is iterative numerical solving. On the basis of the calculating method, the throttling device inlet pressure calculating device for the down-hole throttling gas well is invented. The method and device provided by the invention solves the difficult problem of throttling device inlet pressure calculating and have the characteristics of being simple, economical and practical.
Description
technical field [0001] The invention relates to the field of gas well exploitation, and relates to a method and a device for calculating the inlet pressure of a choke in a downhole choke gas well. Background technique [0002] The gas well downhole throttling technology places the downhole throttle at an appropriate position in the tubing to achieve wellbore throttling and pressure reduction, and makes full use of geothermal heating to make the gas flow temperature after throttling higher than the initial temperature of hydrate formation, thereby reducing the surface pipeline. The purpose is to reduce the pressure, cancel the ground heating and heat preservation device, save the investment of alcohol injection pipeline and equipment and the cost of hydrate inhibitor, and reduce the cost of gas well development and management. This technology has been widely used in various large gas fields in my country, and has become a key technology for gas fields to simplify surface proc...
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IPC IPC(8): E21B47/06E21B47/00G06Q50/02
CPCE21B47/06E21B47/00G06Q50/02
Inventor 王志彬姚鑫钟海全
Owner SOUTHWEST PETROLEUM UNIV