Gas well output splitting method for compact gas reservoir at gas collection station production mode

Abstract

The invention relates to a gas well output splitting method in the field of compact gas reservoir gas field exploitation engineering, and specifically relates to a gas well output splitting method for a compact gas reservoir at a gas collection station production mode. The method comprises the following steps: inputting parameters prepared at an early stage; calculating flowing bottomhole pressure pwfi by use of casing pressure according to a static gas column pressure formula; assuming that there is gas output q1i; by use of a single-phase vertical flow formula, calculating restrictor outlet pressure p2i; by use of the single-phase vertical flow formula, calculating restrictor inlet pressure p1i; according to the restrictor inlet pressure and the outlet pressure, by use of a nozzle flow formula, calculating restrictor output q2i; calculating the restrictor output q2i by use of the nozzle flow formula; determining an absolute value of a difference between the assumed flow q1i and the calculated output q2i falls into the scope of an allowed error delta; making i=i+1, and calculating output of a next well; and according to total output of a gas collection station and the calculated output of each single well, splitting the total output into the single wells. The method provided by the invention improves the calculation accuracy, facilitates long-term development of a gas field and enlarges the application scope.

Description

technical field [0001] The invention relates to a gas well production splitting method in the field of tight gas reservoir gas field development engineering, in particular to a gas well used for tight gas reservoirs under the production mode of a gas gathering station that improves the calculation accuracy, facilitates the long-term development of the gas field and expands the scope of application Yield split method. Background technique [0002] Due to the low permeability and low abundance characteristics of tight gas reservoirs, the development cost increases. In order to reduce the production cost, the Sulige Gas Field, a typical tight gas field in my country, adopts a simplified process for mining. The production mode of the gas field at the gas gathering station Under the current circumstances, single well measurement is canceled and the overall measurement of the gas gathering station is adopted, that is, the production of all wells in the gas gathering station is aggr...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the single well production calculation method used in the prior art for gas field production has the following technical problems: low calculation accuracy, unfavorable for the long-term development of the gas field and narrow scope of application

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