The method of preparation of gas for transportation

 

The invention relates to gas production and preparation for transportation of the natural gas industry. Provides a reduction in energy and material costs in the preparation of gas and increasing the efficiency of the process. The inventive method involves the extraction of gas condensate mixtures of high pressure from the well, pre-cleaning, heat transfer and cooling in gas, low-temperature separation, extraction of hydrocarbon condensate for further separation and transportation of the dry gas to the consumer. The cooling gas is performed by splitting vortex pipe for cold and hot streams of gas and hydrocarbon condensate. This cold gas stream is directed to the low-temperature separation. The hot gas stream is directed to mixing with the main stream of dried gas transported to the consumer. Hydrocarbon condensate selected for further separation. 1 Il.

The invention relates to gas industry and can be used in mining and gas transportation in gas fields.

The known method of operation of gas-condensate wells (ed. St-in the USSR № 1094950, MKI E 0 is the s liquid from the cooled gas, transportation of gas to consumers, the introduction into the well annulus stable gas condensate, the condensate throttling after separation, the cooling gas derived gas-liquid mixture, separating a gas-liquid mixture into gas and stable condensate.

The disadvantage of such a method of operation of gas-condensate wells is that it when falling reservoir pressure gas throttling device does not provide the cooling gas derived gas-liquid mixture, and separating the gas-liquid mixture into gas and stable condensate.

The closest to the technical nature of the proposed method is a method of preparing gas for transportation (K. S. Berniev “Production and transport of gas and gas condensate”, M., Nedra, 1985, pp. 150-151, Fig. 7.2., the prototype), in which the gas and hydrocarbon condensate for transport involves extracting gas from wells, preliminary removal of solid particles, drip of the water and hydrocarbon condensate, multi-stage cooling of the gas emitting the liquid phase, additional cooling in the refrigeration machine, low-temperature separation, collection hydrocarbon condensate for further separation and the protractor is unsportive is that additional cooling of the gas to the temperature required for low-temperature separation is carried out in a refrigeration machine that requires energy costs and complicates the technological scheme and reduces the efficiency of the process.

The invention solves the problem of reducing energy and material costs in the preparation of gas for transportation and increase the efficiency of the process.

To achieve the mentioned technical result of the proposed method for the preparation of gas for transportation, including the extraction of gas condensate mixtures of high pressure from the well, pre-cleaning, heat transfer and cooling in gas, low-temperature separation, extraction of hydrocarbon condensate for further separation and transportation of the dry gas to the consumer, the cooling gas is performed by splitting vortex pipe for cold and hot streams of gas and hydrocarbon condensate, while the cold gas stream is directed to the low-temperature separation, the hot gas stream is directed to mixing with the main stream of dried gas transported to the consumer, and hydrocarbon condensate selected for further telenium his vortex pipe for cold and hot streams of gas and hydrocarbon condensate, and direction then the cold gas flow to the low-temperature separation, the hot gas stream to the mixing with the main stream of dried gas transported to the consumer, and hydrocarbon condensate for further separation.

Reducing energy and material costs at the gas treatment is achieved through the implementation of cooling no cooling machine, requiring significant expenditure, and the separation gas to the hot and cold streams of gas and hydrocarbon condensate vortex tube, the installation and operation of which requires a much smaller cost. The efficiency of the process increases as the low-temperature separation of direct cold gas stream with a lower content of hydrocarbon condensate, which is taken after the separation.

The proposed method is illustrated by a drawing, which shows a flow chart of preparing gas for transportation.

Technological scheme of gas for transportation includes the well 1, the separator prefilter gas 2 condensate 3, the heat exchanger 4, three-flow vortex tube 5 with a pipe for cold flow 6, the hot gas stream 7 and a cavity for Bazoberry collector 12.

The method is as follows.

Gas-condensate mixture of high pressure from the well 1 is directed to a pre-cleaning drip water and hydrocarbon condensate in the separator 2. Water away, and hydrocarbon condensate collected in the condensate 3. Next, the pre-purified gas is sent to the heat exchanger 4, in which the heat transfer from the dry cold gas flowing in the annulus of the heat exchanger 4 after low-temperature separation of the low-temperature separator 10. As a result of heat exchange the temperature of the gas is reduced to a temperature of 2-3°C higher than the temperature of hydrate formation.

After the implementation of the heat transfer gas is cooled by separate three-flow vortex tube 5, known as the tube is Wound-hilsa. Due to their structural peculiarities of the vortex tube 5, supplied to it tangentially swirling the input gas stream is divided into two flow gas cold and hot and hydrocarbon condensate. The cold gas flow from the pipe 6 three-flow vortex tube 5 is sent via a stop valve 9 in the low-temperature separator 10 in which gas into the hydrocarbon condensate which is collected in kondensatsionnyi collector 12 and the annulus of the heat exchanger 4 and then in the gas manifold 12.

The hot gas stream from the nozzle 7 three-flow vortex tube 5 is sent to the mixing with the main flow of dry gas and then gas gathering manifold 12 for transportation to the customer.

Hydrocarbon condensate formed in the separation process gas is collected in the cavity of the condensate collection 8 vortex tube 5 and then sent to the condensate 11. Of the condensate 11 condensate away for further separation.

The gas that goes along with the condensate into the condensate 11 from its upper part is directed to a gas manifold 12.

Example.

To receive the cooled gas separation selected three-flow vortex tube, the corresponding technical parameters and characteristics of typical refrigeration machines, for example ΜV 40-7-2 (directory “Refrigerating machines and apparatus, part 1, M, CONTAINERTYPES, page 4-7, 1991) power consumption power 52 kW.

Determine the performance of selected cold vortex tube in the performance of the natural gas V=25000 nm3/h according to the formula Qx=VWithpT, wherethe fraction of cold gas stream,=0,717 kg/ nm3;p- specific heat of natural gas under normal conditions, Withp=0,571 kcal/kg °C;T - temperature of cold stream. AcceptT=10°C, sufficient to ensure the condensation of hydrocarbons and, consequently, for the implementation of low-temperature gas separation.

Qx=0,45250000,7170,57110=46058,3 kcal/h, as well as 1 kcal/h corresponds 1,163 W, Qx=53,5 kW, which is comparable with a power consumption of the refrigerating chamber.

Thus, the implementation of the cooling gas by separation of the main flow vortex tube on the cold and hot streams of gas and hydrocarbon condensate and direction then the cold gas flow to the low-temperature separation, the hot gas flow to the mixing with the main stream of dried gas transported to the consumer, and hydrocarbon condensate for further separation reduced energy and material costs in the preparation of gas for transportation and increase the efficiency of the process.

Claims

 

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1 ex, 1 dwg

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