The method of preparation of paraffin gas-condensate mixture to the transport and processing

 

The invention relates to gas industry and can be used in the preparation of gas-condensate paraffin mixture to the transport and processing. The method consists in the separation, the heating part of the mixture for feeding the column directly, directly with the use of irrigation columns other unheated part of the blend, while the preparation is subjected to two mixtures with different content of paraffin, a mixture with a higher content of paraffin is heated before separation, sephirot, heated to power the columns directly, deethanizer using irrigation separated mixture with a lower paraffin content. The invention allows to obtain defnitively condensation of volatile paraffin condensate allocated to the installations of commercial preparation of gas-condensate reservoirs with high paraffin content with minimal capital and operating costs. 1 Il.

The method of preparation of paraffin gas-condensate mixture to the transport and processing of

The alleged invention relates to gas industry and can be used in the preparation of gas-condensate paraffin mixture to Transpo gas-condensate mixture to the transport and processing (see T. M. Bekirov, G. A. Lanchakov. Technology of processing of gas and condensate. - M.: Nedra, 1999, S. 479-483), including a preliminary separation of gas in the inlet at low temperature (close to the temperature of the soil), the separation of the separated condensate into two streams, one of which is heated in the regenerative heat exchanger and is fed to the column directly as food, and the second part is directed to the top of the column directly as irrigation.

The disadvantage of this method is the impossibility of preparing paraffin condensate due to precipitation and deposition of paraffins in the process equipment in areas with temperatures below the crystallization of paraffins, in particular, in the inlet and on the upper plates of the column directly.

There is also known a method of preparing parathyroidectomy gas-condensate mixture to transport (see RF patent 2165523, E 21 B 43/34, F 17 D 1/00, 2000), which are preparing condensate in two technological lines on the technology of low-temperature separation, in which the first line is treated condensate with low paraffin content, and the second - with a high content of paraffins, thus to prevent loss and fat vtoroy line in front of the entrance separator and before the recuperative heat exchanger.

The disadvantage of this method is the impossibility of obtaining deethanizing condensate on the technology of low-temperature separation in mind the low quality of the separation of light hydrocarbons between the flow of gas and condensate in the separation equipment.

The closest analogue to the proposed technical solution is the method of preparation of paraffin gas-condensate mixture to the transport and processing (see T. M. Bekirov, G. A. Lanchakov. Technology of processing of gas and condensate. - M.: Nedra, 1999, S. 483-484), including separation of the mixture in two stages, the heat of condensation of the first separation stage and feeds it into the middle part of the column directly. The condensate of the second stage fully or partially served on the top plate of the column as irrigation, i.e., as a food column directly use heavy condensate selected from the first separation stage, as well as irrigation - light condensate from the low-temperature stage of separation.

Thanks to prevent the paraffin on the top plates of the column directly in the zone of low temperatures as applied to the irrigation of light condensate does not contain high-melting paraffins, as well as in the separation equipment, p is cristallization paraffins.

The disadvantage of this method is the impossibility of its realization for the preparation of paraffin and gas condensate mixtures in terms of processing plants remote from commercial units, in view of the fact that unstable condensate supply to the plants from the fields in mixed form on a single pipeline, since the separate transport of condensate from the first and the low-temperature stages of separation requires significant additional costs for construction of the second pipeline, and the application of special measures to protect against the formation of paraffin sediments pipeline heavy waxy condensate from the first separation stage. In addition, directly after the concentration of the high-melting paraffins in the condensate increases, which requires the use of special measures for the protection of equipment and pipelines from the formation of paraffin sediments for handling and processing deethanizing paraffin condensate.

The task of the invention is the obtaining deethanizing condensate of volatile paraffin condensate allocated to the installations of commercial preparation of the products of gas-condensate reservoirs with high paraffin content (for example, product ashenia which aims invention improvement of technology of preparation of the condensate mixture for additional involvement resources paraffin hydrocarbons in raw materials gas and condensationmode with the purpose of better utilization of installed process equipment, increase production of marketable products and improvement of technical and economic indicators.

The task and the technical result is achieved by the fact that in the known method of preparation of paraffin and gas-condensate mixture to the transport and processing, including separation, heating part of the mixture for feeding the column directly, deethanization using irrigation columns other unheated part of the mixture, the preparation is subjected to two mixtures with different content of paraffin, a mixture with a higher paraffin content warm up before separation, sephirot, heated to supply the column directly and deethanizer using irrigation separated mixture with a lower paraffin content.

The method is as follows.

To prevent hair loss and paraffin in the inlet of the technological scheme of the preparation use heated paraphysomonas of condensate, allocated to the cube of the column directly. After separation parathyroidectomy condensate is additionally heated in the following regenerative heat exchanger and is fed to the column directly as food. To prevent hair loss and paraffin on the top plates of the column directly to the irrigation use other condensate deposits with low paraffin content supplied to the column after the preliminary separation (separate from paraffin condensate) in the second input separator. In the process directly paraffin condensate dilute condensate with low paraffin content, resulting in a reduced wax content in detalizirovannoi condensate and prevents the precipitation and deposition from it waxes during its transport and further processing.

The claimed method is illustrated in the drawing, which shows a flow chart of preparing paraffin condensate mixture to the transport and processing in the conditions of the Urengoy field.

It includes the heat exchanger 1, three-phase separators 2 and 3, recuperative heat exchangers 4 and 5, the column directly 6, air coolers 7, 8, 9.

The scheme works the trail is a pressure of 3.5-4 MPa passes the heat exchanger 1, where it is heated to a temperature of 30-40(At which paraffin waxes are completely dissolved in the liquid phase condensate), and comes in three phase separator 2. Preheating paraffin condensate in the heat exchanger 1 provides protection switchgear three-phase separator 2 from falling out and deposits it hard paraffin.

Of the three-phase separator 2 gas separation is sent to the gas line directly, produced water away from the installation for recycling, and partially separated dehghanisanij paraffin condensate sequentially passes through recuperative heat exchangers 4 and 5, where it is heated to a temperature of 100-110C, and is sent to the column directly 6 as a power supply.

Respirability NC with temperature below 0C and a pressure of 3.5-4 MPa in a three-phase separator 3, where the gas separation assign to the gas line directly, produced water sent for recycling, and separated partially degassed cold respirability condensate is directed into the upper part of the column directly 6 as irrigation.

The separation of feed and crosgrey paraffin condensate) prevents the deposition and the deposition of paraffins on the upper plates of the column directly.

From the top of the column directly 6 gas is directly sent to the gas line directly, where it is mixed with gas separation of the three-phase separators 2 and 3 and away from the installation.

Due to the separation of the flows of power and irrigation paraffin condensate does not rise above the middle part of the column directly 6, the result of which is excluded drip flue gas directly and prevents the precipitation and deposition of paraffins in the systems of inter-field and main gas transportation.

Mixed (paraffin and respirability) defnitively condensate (DK) from the bottom of the column directly 6 successively cooled in the regenerative heat exchanger 5 and 4, the heat exchanger 1, air coolers 7, 8, 9 (parallel threads) and away from unit. For regulating the degree of heating paraffin condensate in the heat exchanger 1 of the flow of the DC of the recuperative heat exchangers 4 and 5 passes, bypassing the heat exchanger 1, the bypass line directly to the air coolers 7, 8 and 9. Mixing paraffin condensate Asparaginate in detalizirovannoi the condensate reduces the content of heavy paraffin hydrocarbons and prevents the precipitation of solid pairs of the sport.

For flexible adjustment of the volume flows of raw material and technological parameters of the installation, and the composition of the mixed deethanizing condensation on the unit additionally provides for the supply of three-phase separator 3 parts asparaginase partially degassed condensate through recuperative heat exchangers 4 and 5 in the column directly 6 as a power supply in a mixture with paraffin condensate. This solution allows to reduce the load setup paraffin condensate (at very high content of paraffins and to increase the degree of protection against falling paraffin waxes mixed deethanizing condensation during storage and transport.

The use of two condensates in a single processing circuit allows, on the one hand, due to the involvement of paraffin condensate to increase the potential of diesel fractions, on the other hand, the involvement of asparaginase condensate will provide an opportunity to significantly reduce costs for processing highly paraffinic feedstock.

Claims

The method of preparation of paraffin gas-condensate mixture to transport, including separation, heating part of the mixture for feeding Colo is different, however, what preparation is subjected to two mixtures with different content of paraffin, a mixture with a higher content of paraffin is heated before separation, sephirot, heated to power the columns directly, deethanizer using irrigation separated mixture with a lower paraffin content.

 

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