METHOD FOR PRESSURE PROFILE DETERMINATION IN WELL BORE, DISCHARGE LINES AND IN PIPELINES AND DETERMINATION METHOD IMPLEMENTATION (VARIANTS) Russian patent published in 2005 - IPC

FIELD: survey of boreholes or wells, particularly for tracing pressure distribution along well bore and for diagnosing various situations in well bore.

SUBSTANCE: method involves temporarily blocking part or full fluid flow by quick-acting valve gate along with continuously recording pressure in point spaced a small distance from the valve gate in upstream direction; determining friction losses with the use of Darcy-Weisbach equation; plotting diagram depicting pressure as a function of distance on the base of above time diagram and on the base of acoustic speed in real fluid with the use of the following relation: ΔL=0.5aΔt, which correlates time Δt with distance ΔL. To estimate acoustic speed in fluid one may use correlations which determine relation between hydraulic impact value, fluid pressure, fluid velocity and acoustic speed in the fluid and which are known from Joukowski formula. Acoustic speed also may be estimated on the base of time determination between pressure change peaks depicted on time diagram and caused by equipment, flow sectional area and other parts located along well bore, discharge line and pipeline in predetermined points. Acoustic speed may be determined on the base of changes in time diagrams in at least two different points along pipeline and by comparison of above time diagrams. Combined well temperature and pressure diagram may also be obtained, wherein above temperature distribution along well bore depth is measured with the use of optical fiber. Above method may be used to determine and localize influx points in well bore, discharge line and pipeline or to determine and localize losses from well. Method may also be used to determine and localize collapse of discharge lines or presence of deposits, namely hydrates, solid hydrocarbons, pyrobitumen or sand. Above method may be used to determine effective diameters of well bore, discharge line or pipeline in different sections thereof, or to determine which gas lift valves are in working state and to localize and determine working characteristic values of pipeline equipment utilized for oil and/or gas production.

EFFECT: increased efficiency of well survey.

12 cl, 11 dwg, 2 ex