A method for evaluating the productivity of offshore oil wells

Abstract

The invention relates to the technical field of oil reservoir dynamic analysis, and discloses an offshore oil well productivity evaluation method, comprising the following steps: Step 1: according to the offshore oil well production data, draw a relationship diagram between the output and bottom hole flow pressure; original formation pressure P ei Draw the tangent line of the relationship diagram, and the slope of the tangent line is the initial maximum production capacity J oi ; Step 3: Assume a formation pressure P e , calculate the formation pressure P e capacity J o *; Step 4: Calculate the original formation pressure P ei Crude oil viscosity μ of lower crude oil 0i , crude oil volume coefficient B 0i , calculate the formation pressure P e Crude viscosity μ of lower crude oil 0 , crude oil volume coefficient B 0 ; according to the crude oil viscosity μ 0 and μ 0i , crude oil volume coefficient B 0 and B 0i Calculate capacity J o ; Step 5: Calculate the comparative capacity J o *with J o The size of , judge whether the calculation accuracy is met, if so, output the oil well productivity J o and formation pressure P e , if not, go back to step 3 to adjust the formation pressure P e , until the accuracy is met. This solution can conveniently and effectively measure the production capacity of offshore oil fields, and effectively reduce the testing cost.

Description

technical field [0001] The invention relates to the technical field of oil reservoir dynamic analysis, in particular to a method for evaluating the productivity of an offshore oil well. Background technique [0002] Productivity evaluation is one of the important contents of reservoir dynamic analysis and research, and accurate prediction of oil well productivity is also the basis for scientific and rational development of oilfields. At present, the main methods of oil well productivity analysis are: (1) On the basis of knowing the physical parameters of the reservoir, use the oil well productivity formula to calculate, which is referred to as the formula method; (2) According to the principle of fluid seepage in the reservoir, adopt the stable productivity test , according to the relationship between flow pressure and production capacity analysis, this method is called capacity test method. [0003] (1) Formula method to calculate production capacity [0004] When the oil...

AI Technical Summary

Problems solved by technology

[0022] This method must carry out the bottom hole flow pressure and productivity test, and it is required to test under the same formation pressure during the test, but the cost of productivity test in offshore oilfield is high, so the productivity test is generally less

Images