Productivity testing real-time adjustment method of offshore oil well

Abstract

The invention discloses a productivity testing real-time adjustment method of an offshore oil well. The productivity testing real-time adjustment method comprises the following steps: monitoring wellhead pressure and flow at a productivity testing phase of the offshore oil well in real time; converting to obtain a bottom hole flowing pressure and time relation; judging whether testing-grade bottom hole reaches a stable state or not; if so, carrying out the next step; otherwise, continually testing; adjusting testing-grade testing time and replacing a working system in time; judging whether actually measured bottom hole flowing pressure is equal to a pre-set relation value or not; if so, carrying out the next step; otherwise, revising reservoir parameters corresponding to the pre-set relation value; judging whether a pre-set relation of an untested grade meets testing requirements or not; if so, designing testing flow and a time sequence and adjusting a testing scheme; otherwise, revising untested grade flow and time sequence, which correspond to the pre-set relation value. By adopting the method disclosed by the invention, a productivity testing scheme is adjusted in real time, and the success rate of the testing and the quality of recorded testing data are improved; testing risks are reduced and the testing cost is saved.

Description

technical field [0001] The invention relates to the field of productivity testing for exploration and development of offshore oil and gas fields, in particular to a method for real-time adjustment and optimization of an oil well productivity testing scheme according to test data. Background technique [0002] The selection of test production sequence and the determination of well opening time are important contents of productivity test design. Reasonable allocation of production and well opening time is the key to collecting high-quality test data and improving the accuracy of productivity evaluation. For oil wells, the common test method is back pressure well test, which requires continuous production with 3 to 4 working systems (nozzles) in order of production after the well is opened and blowout, so that the pressure and flow rate of each stage reach a relative Stablize. Due to the inaccurate understanding of formation conditions and underground fluids, it is necessary t...

AI Technical Summary

Problems solved by technology

Due to the inaccurate understanding of formation conditions and underground fluids, it is necessary to adjust the subsequent test plan in time during the test process, otherwise it will cause difficulties in the productivity analysis after the test: Excessive test nozzles will lead to long test pressure and flow rate. The time is not stable, which reduces the validity of the test data; the test nozzle is too small, which leads to the inability to widen the gap between the work systems at all levels, and cannot fully reflect the production capacity of the reservoir

The bottomhole pressure gauge data can only be obtained after the test is completed and the pipe string is pulled out, and the adjustment of the test plan lacks the important basis of bottomhole pressure data.

The cost of offshore oil and gas testing is high. Due to the lack of a systematic real-time adjustment method during the test, we can only rely on the experience of the staff, resulting in the lack of timely and effective adjustment of the test plan, prolonging the test time, and increasing the test cost.

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