Plunger gas lift drainage gas recovery production logging system and its control method

Abstract

The invention relates to a measurement system and a control method thereof and specifically provides a plunger gas-lift drainage / gas production logging system. The plunger gas-lift drainage / gas production logging system comprises an upper computer and a lower computer; the upper computer comprises a wireless communication module and a wellhead controller both mounted on a blowout prevention pipe; the lower computer comprises a production logging module; the production logging module is mounted inside a plunger or on the upper part of the plunger; the production logging module is connected with a travel switch; the travel switch is connected with a collision rod in the plunger; according to the control method, the production logging is combined with the plunger gas-lift process, the production logging is performed by use of the well shut-in re-pressing stage of the operation course of the gas-lift process, the temperature and the flowing pressure at the bottom of the well and the liquid production flow information are measured, the measurement data are saved locally at the bottom of the well firstly and then transmitted to the wellhead controller by use of a wireless communication scheme at an uplink stage, and therefore, safe acquisition of the logging data is realized, and the data accuracy and the data acquisition diversity are improved.

Description

technical field [0001] The invention relates to a measurement system and a control method thereof, in particular to a plunger gas lift drainage gas recovery production logging system and a control method thereof. Background technique [0002] The plunger gas lift drainage gas recovery process is a process of intermittent gas lift oil and gas recovery. Since a solid sealing interface - the plunger - is provided between the lifted gas and the lifted liquid, this process reduces the pressure of the gas. Channeling and falling back of liquid can effectively improve the lifting efficiency of gas energy and greatly increase the production of the well. [0003] Once the current plunger gas lift drainage gas recovery technology is installed and used, it cannot directly measure the gas production of the downhole formation during operation, and can only indirectly estimate and judge the formation by measuring oil pressure, casing pressure, gas production and water production at the su...

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Problems solved by technology

[0003] Once the current plunger gas lift drainage gas recovery technology is installed and used, it cannot directly measure the gas production of the downhole formation during operation, and can only indirectly estimate and judge the formation by measuring oil pressure, casing pressure, gas production and water production at the surface wellhead In the actual situation, only using these data can not provide more parameters for the solution of the theoretical model of the process, can not provide more practical information for the optimization of the process, and cannot provide reliable and practical information for the adjustment of the working cycle during the process operation. basis, unable to monitor and analyze the production status and development dynamics of oil and gas reservoirs

Moreover, once the gas production process starts running, it is very inconvenient to run the production logging tool for production logging.

[0004] The application number is 201110402030.1 Invention Patent "Plunger Downhole Running State Tracking System and Working Method for Gas Production", which provides a plunger downhole positioning and running state tracking system. This technology is only for the positioning and movement of the plunger itself in the downhole The state is monitored, the detection object is single, the geological formation of the natural gas well cannot be detected, and the gas production situation and water production degree of the gas layer cannot be grasped in time

Its data transmission uses the plunger running in the tubing to collide with the tubing collar to generate an acoustic pulse signal that is transmitted along the tubing to the ground, or the plunger detection subsystem directly emits an acoustic pulse signal that is transmitted from the gas medium in the tubing to the wellhead. This transmission method has the advantages of Disadvantages: (1) Intersymbol interference

The high emission characteristics between the oil pipe joints lead to the impact time of the drill string pulse lasting up to hundreds of milliseconds, which will cause obvious interference between codes, which is the main factor restricting the channel transmission capacity

(2) Noise interference

(3) Sound wave attenuation

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