EA023666B1 - Deep well pump diagnostics method - Google Patents

Abstract

The invention relates to oil production, in particular, to equipment diagnostics methods, and can be used in systems for monitoring the technical state of deep well pumps. The essence of the invention consists in a method for diagnostics of technical condition of deep well pumps. The method comprises laboratory determination of water and gas content and density in reservoir fluid (RF). The following parameters are measured: dynamical RF level in the production (casing) string upstream of the suction valve, movement of the polished rod, casing head pressure, and pressure on the tubing orifice upstream of the backpressure valve. Using the data obtained, the diagnostic indicator (DI) value is calculated, a curve of DI vs polished rod cyclic movement (piezogram) is plotted, and the state of the deep well pump is diagnosed on the basis of the piezogram. The technical effect of the invention is that it permits in-process, efficient and reliable diagnostics of the main parameter of the deep well pump, namely, the pump delivery.

Description

(57) The invention relates to the oil industry, in particular to equipment diagnostic technology, and can be used in monitoring systems for the status of oil well submersible pumps. The invention consists in a method for diagnosing the technical condition of a submersible pump. The method includes laboratory determination of the content and density of water and gas in the formation fluid. Measure the dynamic level of the pancreas in the production (casing) string to the suction valve, the movement of the polished rod and the pressure at the mouth of the production string, the pressure at the mouth of the tubing in front of the check valve. According to the data obtained, the value of the diagnostic indicator (DP) is calculated, a graph of the dependence of the DP on the cyclic movement of the polished rod — a piezogram — is built and the state of the deep pump is diagnosed using it. The technical effect of the claimed invention lies in the fact that it allows you to quickly, efficiently and reliably diagnose the main condition of the deep pump - its supply.

Claims (1)

A method for diagnosing the state of a downhole pump, including measuring the movement of a polished rod, plotting the dependence of the load on the polished rod on its movement and analyzing the graph by the characteristic signs of the state of a deep pump, characterized in that the water and gas contents and their densities in the formation fluid are determined by laboratory means; measure the dynamic level of the reservoir fluid in the production string to the suction valve, the pressure at the mouth of the production string and the pressure at the mouth of the tubing in front of the check valve; according to the data obtained by the formulas ξ = / (x): ζ = ^p Y = ^p Y · 'Ru + P Ru + Rpzdz-Yu-r'u' Рпж ~ (1 - ^α ) Ϊ.Ρββ Ί Рн (7- - calculate the value of the diagnostic indicator (DP) and build a graph of the dependence of DP on the cyclic movement of the polished rod - a piezogram that diagnoses the state of the downhole pump, where TS is the movement of the polished rod, m; ξ - diagnostic indicator, unit unit; Ru ^to Ru - pressure at the mouth of the tubing in front of the check valve and production casing, respectively, MPa; p - hydrostatic pressure of the column of formation fluid (RV) on the plunger, MPa; p _pzh , p _in , p _n and p _g - the density of the pancreas, water, oil and gas, kg / m ³ ; 1 - the depth of the pump, m; 1ι - distance from the dynamic level of the pancreas in the production (casing) string to the suction valve, m; α and β - water and gas content in the pancreas, fractions of units; d - acceleration of gravity, m / s ² .