The method of preparation parathyroidectomy gas-condensate mixture to the transport

 

(57) Abstract:

The invention relates to the oil and gas industry. The technical result of the invention is the reduction of operating costs for the treatment parathyroidectomy gas condensate mixtures. The method is the preparation for transport of gas condensate mixtures of different layers in two processing threads on the technology of low-temperature separation. In the first process stream process gas and condensate mixture with low paraffin content. The supply of the second process thread in the receiving node and raw materials in the gas stream between the separator first stage and a regenerative heat exchanger condensate first separation stage of the first process threads produced in quantities, decreasing the concentration of paraffins in the mixture is below the threshold. For conveying condensate from the first to the second processing thread without pump separator first stage of the first process threads maintain a higher pressure. 1 C.p. f-crystals, 2 tab., 1 Il.

The invention relates to the oil and gas industry and can be used in the preparation of gas-condensate and gas mixtures for transport.

Known SPO the temperature separation (STC) (see Bekirov T. M., Lanchakov, A. processing of gas and condensate M.: Nedra, 1999, S. 427-430). In this way to prevent paraffin on the installation of STC produce heating GKS before the separator first stage higher than the temperature of the paraffin.

The disadvantages of this method are the large metal installation and increased operating costs associated with heating of the substrate.

The closest analogue to the proposed technical solution is the method of preparation of the SCS to the transport of two processing threads (TN) technology NTS (see RF patent N 2092690, BI-1997, N 28). In this way part of a mixture of condensates steps sensation first TN as solvent fed into the gas flow of the second VT between the separator first stage and a regenerative heat exchanger. Due to this, reduce the concentration parathyroidectomy fraction in the liquid phase and prevent the deposition of paraffin in the solid residue.

The disadvantage of this method is that it does not provide the reliability of the node receiving raw materials (oops) the second technological line, where the wax Deposit on the stop and control valves, sight glasses etc., also produced by the pump and, in General, in the process.

The aim of the invention is to improve the reliability of plant operation: processing parathyroidectomy GCS by eliminating deposition of paraffin in a solid residue in the TSV of the second T and the reduction of energy consumption on the supply of condensate from the first to the second VT.

This goal is achieved as follows. In the way of preparation for the transport of gas condensate mixtures of different layers in two processing threads on the technology of low-temperature separation in the first processing thread to process gas and condensate mixture with low paraffin content and the second gas-condensate mixture with a high content of paraffin as a solvent in the receiving node and raw materials in the gas stream between the separator first stage and a regenerative heat exchanger of the second technological line, serves the condensate from the first separation stage of the first process threads in quantities, decreasing the concentration of paraffins in the mixture is below the threshold.

The present invention does not require expensive equipment and reagents. Condition it is working at the intersection of two TONS, processing raw materials of different compositions. The concentration of paraffins TN.

The amount of condensate supplied from the first TN in the TSV of the second VT, is determined taking into account the number and composition of the raw material in the TSV and the concentration of paraffins in the first condensate TN. The same order is observed and when determining the flow of condensate supplied from the first to the second T in the gas flow between the separator first stage and a regenerative heat exchanger.

The use of condensate first stage of the first TN in the solvent in the second VT reduces the concentration of paraffins in oops and in the liquid phase formed during cooling of the gas in the second heat exchanger TN, below the threshold and prevents the formation of wax in the solid residue.

The drawing is a flow diagram of the preparation for transport GKS two deposits according to the invention. At first T handle GCS with low paraffin content, and the other GCS with high paraffin content.

GCS low paraffin content on line 1 serves in the first separator stage 2 first TN where divided into phases.

The gas phase along the line 3 serves the additional processing unit 4, which produces the cooling gas and the mixture is divided into liquid and gas phase. Received PA the tel-8 for separation of wageindicator phase and gas condensate (the condensate). Wageindicator phase line 9 serves for regeneration.

The condensate line 10 is removed from the separator and is divided into two streams. Part of the condensate along the line 11 is removed for further processing. Another part of the condensate line 12 serves on the suction side of the pump 13 where you can win up to a pressure of 0.15 to 0.20 MPa higher than the pressure of the second VT on line 14 serves for the second VT. When there is excess pressure in the first TN condensate to the second TN is served by gravity, without the use of pumps.

GCS with high paraffin content in line 15 serves in oops 16 second TN. In oops on line 17 serves part of the condensate from the first separation stage of the first VT. The mixture in line 18 serves in the separator 19 for separating liquid and gas phase.

The gas phase 20 is mixed with a part of the condensate from the first stage is supplied through line 21 from the first VT. The mixture is then on line 22 serves to heat exchanger 23, where it is cooled to the desired temperature. The resulting mixture through line 24 serves for further processing.

The liquid phase from separator 19 through line 25 is removed for further processing.

For a comparative assessment of options for the preparation of gas-condensate mixture is closest analogue and the proposed method performed izlenim in terms of stable condensate fraction WITH5+) paraffin wax content in the SCS with high paraffin content is 3.8 wt.%.

Upon receipt of such a raw material in the TSV of the second T is the deposition of paraffin in the solid residue.

The paraffin content in the condensate from the first separation stage of the first VT is 0.09 wt. % (in terms of stable condensate 0.1 wt.%), that is many times less than in the second condensate TN. Therefore, when the supply of condensate from the first to the second TN is a decrease in the concentration of paraffins in the liquid phase in oops Yves liquid phase formed during cooling of the gas in the heat exchanger 23.

The results of the experiments when working in different modes are given in table.2. In all modes constant was the concentration of paraffins in the condensate supplied from the first to the second VT (0.09 wt.%) and in the liquid phase in the TSV of the second VT (3.5 wt%), as well as the pressure and the temperature in the separator first stage of the first and second process thread. In all modes, the performance of the second TN is 210 thousand m3/PM

To prevent paraffin deposits in oops second VT mass concentration of paraffins in the liquid phase should not exceed 2.45 wt.%. This indicator for the liquid phase formed at ondawame in oops the second T in the gas flow between the separator 19 and the heat exchanger 23.

The performance process lines installed when operating in different modes are given in table.2.

In the first mode process trains operate autonomously, with the first T second T condensate is not available: In the liquid phase oops second TN concentration of paraffins is 3.5 wt.%, what 1.42 times the threshold level. Is the loss of paraffins in sediment. In the liquid phase formed during cooling of the gas in the heat exchanger 23, the concentration of paraffins equal to 1.03%, also higher than the threshold value (0.80 wt.%); not provide exchanger 23 without loss of paraffins in sediment. (In the table.2 the possibility of paraffin with the fire and the heat exchanger 23 is indicated with a plus sign, and without deposits with a minus sign).

In the second mode process threads are similar: there is no flow of condensate in the TSV of the second VT. So here, as in the first mode, is the deposition of paraffin in the COC. In the gas stream before the heat exchanger 23 serves 24.4 kg/1000 m3condensate. There is a decrease in the concentration of paraffins with 1.03 wt.% to 0.45 wt.%, which is more than 2 times lower than the threshold value. Not is the deposition of paraffin in the heat exchanger 23.

In the third mode of the mouth of the gas before the heat exchanger 23 of the second VT.

The flow of condensate in the oops in the number 0.354 kg per 1 kg of the liquid phase concentration of paraffins in the liquid phase decreases from 3.5 to 2.58% wt.%. It 0.11% above the threshold, therefore, does not provide oops without paraffin. In the gas stream before the heat exchanger 23 serves 24.4 kg/1000 m3condensate. This reduces the concentration of paraffins in the liquid phase from 1.03 to 0.45 wt.%, that is below the threshold. In the heat exchanger 23 is not is the deposition of paraffins. In subsequent experiments (4 and 5) is supported by the same mode of operation of the heat exchanger 23, and this device works without paraffin.

In the fourth mode in oops condensate is fed in the amount of 0.84 kg per 1 kg of the liquid. This provides a reduction in the concentration of paraffins in the liquid phase to 1.94 wt.%, that is significantly below the threshold (2.45 wt.%): prevents precipitation of paraffins in the solid residue.

In the fifth mode consumption process lines are identical to those of the fourth mode. In addition, the second VT pressure is maintained at 0.20 MPa lower than the first VT. This provides a flow of condensate from the first to the second VT without the use of a pump.

In General, when working on the technology of the present invention in the second technology is atinav.

1. The method of preparation parathyroidectomy gas-condensate mixture to transport, including processing the mixture into two processing threads on the technology of low-temperature separation, in which the first process stream process gas and condensate mixture with a low content of paraffins, and a second thread - condensate mixture with a high content of paraffins, as a solvent in a second production line in the gas flow between the separator first stage and a regenerative heat exchanger serves the condensate from the first separation stage of the first process thread, wherein the condensate from the first separation stage can be enjoyed in the receiving node of the second raw material process trains in quantities decreasing the concentration of paraffins in the mixture is below the threshold.

2. The method according to p. 1, characterized in that the receiving node of the second raw material technological leg support lower pressure and supply condensate to the second processing thread without using the pump.

 

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