Research Process Adaptability Longgang Gas Gathering Pipeline Mixed Transportation

Longgang gas field has " medium-high sulfur, medium-high content of carbon dioxide and high temperature, high pressure," and other features, the content of H2S between28.25～72g/m3, CO2content is generally in the40g/m3about, at present the gas production at450×104m3/d or so, southwest oil and Gas Field Branch Sichuan gas Field one of the main field. Gas gathering and transportation projects in the ground, using Multiphase technology will be delivered directly to the wellhead treatment plant mixture centralized processing, eliminating the well site separation equipment, construction of the gas-liquid two-routed one sub-transmission construction and minimize the gas mining costs, improve economic efficiency. Sichuan Petroleum Gas Field Longgang gas field in Chongqing earlier in the fluid with gas pipeline construction, access to the rich pipeline design, construction, operation and management experience. But mixed media in pipeline flow state complex, so it is necessary to Longgang gas gathering pipelines within existing mixed transportation technology of adaptive research.(1) Proposed Longgang gas multiphase process adaptability general research methods and procedures, the establishment of Longgang gas effusion wet gas gathering pipeline forecasting model, select a number of typical pipeline operating conditions were simulated and analyzed in order to collect the actual production data for fluid model was checked and corrected. Obtained along the flow pattern changes, the total amount of fluid piping, liquid holdup distribution, pressure changes, gas liquid velocity and temperature distribution results.(2) Simulation of the mixed gas pipeline different amount of total water production pipeline under fluid volume, gas flow rate, pressure, and along the way changes in liquid holdup predicted decline in gas field exploitation late, increased water production extreme conditions such as changes in the operating parameters of the pipeline, the pipeline is drawn existing pipeline pressures, flow rates better adaptability, able to guarantee the gas-liquid mixing pipeline safe and efficient operation of the conclusions. From the fluid volume, pressure, and other aspects of the extreme conditions of the mixed pipeline operating conditions.(3) Establish a moisture gathering pipeline pigging process simulation model to simulate the pigging process pressure, flow, fluid volume, liquid holdup and other parameters change. Pigging cycle analyzes the factors affecting the formation of pigging cycle calculation process is proposed pigging and pigging cycles recommendations.(4) From the slug flow control,"V" shaped gullies pigging process analysis of the characteristics, pigging operation monitoring, pigging their ways gives pipeline pigging recommendations. From the clear tube lose efficiency recommendation, conventional ways to reduce the limitations of pipeline fluid analysis and other aspects of pigging cycle recommendations.(5) Relying on the basis of the data pipeline, the actual production run data and simulation data to establish a multiphase process operating parameters database through statistical methods, the fitting out of the mixed fluid pipeline forecast relational.(6) Developed in Chuanzhong oil-gas field pipeline data management system, realize the system maintenance, data management, calculation, calculation of pigging effusion, hydrate prediction five functional modules, promoted in Chuanzhong oil-gas field multiphase process operation data management automation, standardization andstructured.