DD286652A5 - PROCEDURE FOR THE SAFELY USE OF MAXIMUM AND MINIMUM PROBE PRESENCE IN THE GAS FILLING FROM UNDERGROUND STORAGE OR FEEDING AND WHEN RESTORING FROM GASSONDS TO NATURAL GAS FIELDS - Google Patents

Abstract

The invention relates to a method for the safe use of maximum and minimum Sondendruecke when Gasfoerdern from underground storage or feed and Foerdern from gas probes on natural gas fields. The field of application of the invention relates to the gas propagation in pipelines, in particular in parallel pipelines with great decrease and pressure fluctuations in the gas stream. When operating gas pipes from sources with different pressures, uncontrolled vibrations, pressure impacts or critical velocities can occur due to the pressure differences when stringing the pipes. For a safe pressure equalization, a combination of shut-off valves and fixed orifice is suggested, which balances the pressure with a control program by means of a decentralized control. Pipelines; Pressure equalization; Gas wells; Underground storage; Gas fields}

Description

In the further course of the pressure in underground storage can be increased or decreased by the described coupling of precision pressure transducer, process computing and control technology in compliance with the geological parameters in automatic operation up to the objective safety limits. This gives the possibility of driving the minimum or maximum internal memory pressures without jeopardizing mining safety.

The critical pressures and pressure differences are detected by measurement in all probes and SontiensammelleiUingen a underground storage facility or a natural gas field and processed in a central process computer. When occurring minimum or maximum pressure or pressure differences switching commands are issued to the decentralized control and / or operating instructions for the plant operator as a result of this variable programmable processing. If such dangerous moments are not present, the central process computer gives the plant operator the option of interconnecting several probes for a maximum feed rate. All unspecified possibilities of interconnection are locked by the computer against activation (access lock !.

Ausführungsbeisplel

When underground reservoirs with several caverns operate, different pressures are present between the individual probes. Thus, during start-up of the probes 1 and 2, the use of the known device technology for pressure surges and uncontrolled oscillations in the probe and in the probe bus t> i, v / elche considerably reduces the safety of the mining. The pressure surges and uncontrolled vibrations are caused by the large pressure differences between the probes 1 and 2 and the probe bus b. In addition, it can not be excluded that there is a Urnschluß (probe 1 feeds in probe 2) due to the different probe internal pressures. Therefore, the probes 1 and 2 are approached successively via a bypass. The opening pulse for the respective probe is sent from the process computer to the corresponding decentralized controller. The decentralized control now realizes the opening of the safety fitting Sund working fitting B after a predetermined time regime. After pressure equalization and signaling to the process computer, the work fitting A is opened via this. Subsequently, the work fitting B is closed again, and after the stringing of the probe bus b, the work fitting C is operated to the control rails. In case of interruption of the delivery process (input or output) by the process computer first the work fitting A and then the safety valve £, connected. After Rückt enidung the closure of the valves A and San the process computer, the valve C is closed.

Another safety-related locking of the valves A, S and C in a predetermined order takes place upon reaching the minimum and maximum internal memory pressures.

With the help of the pressure sensors P _t and P ₂ on the probe line a, and a ₂ and the probe bus b, the process computer, the required process variables are provided. These process variables are the basis for operating the safety valves.

Furthermore, if a sudden pressure difference (leak or line break) is registered between P ₁ in the probe line and P ₂ in the probe collection when injecting or delivering, the closing of the safety and work fittings is triggered. Thus, in the event of an accident, regardless of control and operating personnel, a safety-related interlocking of the endangered system components by the process computer takes place.

Claims (2)

1. Verfahrenzurgefahrlosen use of maximum and minimum probe bridge when gas pumping from underground storage or when feeding into underground storage and pumping from gas probes on natural gas fields and for special cases such as line defects, using pressure measuring, process computing and Stifftechnik, characterized in that the pressure equalization between the probes of Caverns and natural gas fields and the probe manifold the gas stream is passed through a bypass and a fixed aperture and thereby using a process computer and a decentralized control (connection or memory programmed) is controlled. 2. The method according to claim 1, characterized in that the positioning of the probe and the bypass line are linked together via decentralized control unit. The command outputs to the decentralized control units by a process computer is carried out so that only after the pressure equalization, the work taps are opened and only then the gas transmission via probe and probe bus is made possible. For this 1 page drawing Field of application of the invention The field of application of the invention relates to the gas propagation in pipelines, in particular in parallel pipelines with large decrease and pressure fluctuations in the gas stream. Characteristic of the known state of the art For a continuous supply of consumers with gas, it is common practice to use underground storage as a buffer. The supply and transport of gas in underground storage tanks is done via probe lines equipped with shut-off valves. A volume or pressure control of the gas in manifolds or in a busbar connected parallel pipelines is known. The commercial patent DD No. 263335 describes a superordinate control and regulating device on a microcomputer basis. A removal of storage gas from a Kaverrenepeicheranlage for its supply to a consumer network by means of multi-stage operation is described in the patent DE No. 3637 370. In all known methods, probe lines are operated individually or in parallel as required. In the single-cycle management, different pressures occur. If it is necessary to change the probe line during the individual operation, then an expansion of the probe line is required. When covering a probe line, pressure differences of up to several MPa can result, causing uncontrollable vibrations and impermissible speeds (critical speeds) in the probe installation and on the probe busbars. Are used in a probe line only ball valves as shut-off valves, there is the disadvantage that from mining safety reasons, the maximum and minimum permissible internal pressures of the underground storage can not be extended. Object of the invention The aim of the invention is a method in which, taking into account the technical safety regulations, the maximum and minimum probe returns can be approached when operating underground gas sensors and gas probes on natural gas fields. Explanation of the essence of the invention The object of the invention is to develop a method which can be operated in the operation of gas lines from sources with different pressures so that no pressure surges, uncontrolled vibrations odor critical speeds can occur due to pressure differences, mainly when stringing the pipes, in particular the operation of underground storage facilities should be carried out under optimal use of the storage capacity of the caverns. According to the invention the object is achieved in that a safe pressure equalization between the probes and the probe manifold is performed via a combination of shut-off valves and fixed aperture (bypass) according to a control program by means of decentralized control. In terms of equipment, this control can be realized both in terms of connection programming and memory-programmed. If the desired pressure equalization between probes and probe manifold is established, the Arbeirsarmatur is opened by the central process computer and released the probe for operation.