METHOD TO CONTROL HYDRATE FORMATION PROCESS IN GAS-GATHERING FLOW LINES CONNECTED TO COMMON MANIFOLD AT FAR NORTH GAS AND GAS CONDENSATE DEPOSITS

摘要

FIELD: oil and gas industry.;SUBSTANCE: in the method to control hydrate formation process in gas-gathering flow lines connected to common manifold at the Far North gas and gas condensate deposits that includes determination of commencement of hydrate formation process in the flow line by controlling temperature of gas coming to entry of gas processing plant (GPP) from the flow line and comparison of its behaviour dynamics with dynamics of design temperature as well as delivery of inhibitor to well pads through a separate pipeline, according to the invention to the database of automatic process control system of GPP (GPP APCS) maximum values of potential pressure at each well are entered on regular basis, and these values are determined according to results of gas-hydrodynamic survey of wells, and with use of telemetry continuous measurement or measurement with the preset quantisation increment is carried out for basic parameters of well pads, their flow lines and gas-gathering manifold, and for each well time function curve is plotted according to results of gas pressure measurements at the well mouths, and as soon as by means of GPP APCS commencement of hydrate formation process is detected in gas-gathering flow-line accompanied by pressure increase in all wells either inhibitor is delivered to the well pad or to inhibitor delivery point with less distance from GPP, and when pressure is increased at certain wells only then by means of GPP APCS mode of pressure changes is started at mouth of each such well in order to determine where pressure is increased or approaching its maximum permitted value at the mouth, and against this parameter section of the flow-line -gas-gathering manifold system hydrates are formed, thereafter inhibitor is delivered to the well, which is located right upstream the section with commenced hydrate formation.;EFFECT: improved efficiency of the method due to possible delivery of inhibitor to the required point of the gas-gathering flow-line.;2 dwg