Mobile heat exchanger for heating process fluids in the well

 

(57) Abstract:

The invention relates to the injection of process fluids in oil and gas production, in particular for pumping the heated solvent in the dewaxing of underground equipment wells. In multi-pass heat exchanger pipe inner pipe with the outer side provided with spiral fins. Connected in series pipe pairs are in the form of S-shaped horizontal tube bundle and placed in a cylindrical housing. At the top of the pipe a pair of outer and inner pipes for casing have continued, where respectively provided with outlet and inlet channels. At the bottom of the pipe a pair of inner tube has a tangential exit the inner cavity of the casing, and the outer pipe has continued for casing and provided with inlet channel for receiving a heated fluid. The casing has a back wall provided with l-shaped discharge pipe with a side opening in the upper part, allowing fluid and its level in the casing. Providing intensive heat exchange process in the apparatus with the optimal overall size of the heat exchanger can effectively use it as peredvijnaya when teplofizicheskoi the treatment of wells. 3 Il., table 1.

The alleged invention relates to a heating process fluids and oil and gas production, in particular, is used to pump the heated solvent in dewaxing subsurface well equipment, and can be applied in the petrochemical and other industries.

Known for the shell-and-tube heat exchangers for heating liquids, comprising inlet and outlet headers and the tube bundle, mounted in tube sheets, which are enclosed in a common casing /1/.

The disadvantage of these heat exchangers is a limitation in the application of the high pressure necessary to ensure continuity of the process of heating and injection of fluids into the well. It also requires a complex design of the heat exchanger when a significant temperature difference Teploobmennik environments.

Known also selected as the closest analogue of the heat exchanger for heating process fluids in the well containing the inlet and outlet channels for fluid and heated fluid, connected in series multipass pipe pair consisting of an outer pipe with spiral Orebro large metal consumption per unit of heat transfer surface. A significant area of the outer surface of the outer pipe is not involved in the heat exchange process, but rather is a source of heat loss.

The purpose of the invention is to improve the heat exchange efficiency due to the rational use of coolant.

This goal is achieved by the fact that in multi-pass heat exchanger pipe in pipe" inner tube with an outer side provided with spiral fins. Connected in series pipe pairs are in the form of S-shaped horizontal tube bundle and placed in a cylindrical housing. At the top of the pipe a pair of outer and inner pipes for casing have continued, where respectively provided with outlet and inlet channels. At the bottom of the pipe a pair of inner tube has a tangential exit the inner cavity of the casing, and the outer pipe has continued for casing and provided with inlet channel for the flow of the heated fluid. The casing has a back wall provided with l-shaped discharge pipe with a side opening in the upper part, allowing fluid and its level in the casing.

In Fig. 1 shows the proposed heat exchanger in a longitudinal section; Fig. 2 is a cross rareplanet consists of a casing 1 with a lid 2. In the casing 1 in the form of S-shaped pipe beam pipe are pairs, consisting of the outer pipes 3 and concentrically located in the internal pipe 4 with external spiral ribs 5. The annular space of the pipe between pairs of a series-connected arcuate ridges 6. Inner tube 4 are sequentially connected by means of U-shaped tubes 7. The first steam pipe is continued, when the cover 2 of the outer pipe 3 provided with a discharge channel 8, and the inner tube 4 of the inlet channel 9 for entry of coolant (steam). The inner tube 4 in the bottom of the pipe pair has a tangential outlet 10 into the internal cavity of the casing 1, which is supplied with the l-shaped discharge pipe 11 with a side opening 12 for the free exit of the heat carrier (steam condensate) in the atmosphere and the drain pipe 13. The last outer tube 3 for the cover 2 has continued and is equipped with an intake channel 14 for receiving heated fluid in the heat exchanger.

The proposed heat exchanger mounted on the chassis of the two-wheeled trailer, used for heat transfer from the steam to hydrocarbon solvents (solenodontidae) when exercising at the same time teploporovodnostyu from technology wash well heated solvent is pumped into the annulus or tubing pipe (tubing), or through the flushing tube of smaller diameter, is lowered into the tubing.

In addition to the mobile heat exchanger 15 to implement technologies are used pump unit (CA-320) 17, mobile steam unit (PPU) 18 and tank 19 with the process liquid solvent, which fasten myself to the well 16 to the processing scheme shown in Fig. 3.

The heat exchanger works as follows.

Water vapor (fluid) from the foam 18 is fed into the supply channel 9, the inner tube 4. The coolant passing through the inner pipe 4 and through a tangential outlet 10 in the form of steam condensate with high enough, high temperature, enters the casing 1. By increasing the level of condensate air from the housing 1 is pushed out through the side opening 12 D-shaped socket 11.

After the condensate level, covering the four bottom tube of the pair, through l-shaped discharge pipe 11 is poured out. Accumulated condensate steam from the steady-state level in the casing 1 provides external heating outer pipes 3 and simultaneously performs the function of the hydraulic valve, preventing the migration neskondensirovannyh pair. Latter completion outgoing flow and uniform temperature distribution over the cross section of the casing 1.

The heated fluid is a hydrocarbon solvent through the pump unit 17 is pumped into the annulus through the supply channel 14 of the outer pipe 3. The movement of cold solvent and water vapor occurs in counterflow and due to heat transfer inside and outside the annular space between the inner 4 and outer 3 pipes hydrocarbon solvent is heated to the desired temperature.

Spiral ribs 5, intended to increase the area of heat transfer surface, also provide a circular rotation of the heated fluid around the "hot" pipe and mixing gaseous fractions released from the hydrocarbon solvent under heating.

The heated hydrocarbon solvent downstream channel 8 through the connecting line is pumped into the well 16. At the termination of the process of heat transfer through the S-shaped arrangement of series-connected tube pairs is runoff and steam condensate from the inner pipe 4 into the casing 1 and through the drain valve 13 to the outside. This allows to reliably operate the mobile heat exchanger on the treated wells for negative temperature will 8 is controlled by thermometer, installed in a heat chamber (not shown).

The required temperature of the solvent at the outlet of the heat exchanger is achieved either by regulating the steam temperature or flow generated foam, or with constant values for these parameters by changing the flow rate of solvent through the pump.

The table below shows thermodynamic operation mode of the mobile heat exchanger. At constant value of the parameters (G=1600 kg/h, Tentrance=108oC) a pair of given the values of temperature of the heated liquid (solvent) at the outlet of the heat exchanger depending on the ambient temperature.

The obtained values of temperature of the solvent at the outlet of the heat exchanger satisfy the requirements of technology teplofizicheskoi processing in different periods of the seasons. We offer mobile heat exchanger used in the experimental-industrial technology of processing of wells, and testing has shown its high efficiency and reliability during heating of process fluids.

Sources of information:

1. Ivanets, K. J., A. Leibo N. Equipment refineries and its fluids in the well; containing inlet and outlet channels for fluid and heated fluid, connected in series multipass pipe pair consisting of an outer tube and concentrically therein, the inner tubes are spiral ribbed outer surfaces, characterized in that it is made mobile, pipe pairs are in the form of S-shaped horizontal tube bundle and placed in a cylindrical housing, with the bottom of the last inner tube has a tangential outlet in the inner cavity of the cylindrical casing, which is provided with l-shaped discharge pipe with a side opening in the upper part, allowing fluid and its level in the casing.

 

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FIELD: oil and gas production.

SUBSTANCE: invention is intended to protect inner surface of transmission pipelines against asphalt-tar-paraffin deposits and provides appropriate composition containing 0.5-10% polyvinyl alcohol, 0.01-1% nonionic surfactant (FK 2000 PLUS), and water.

EFFECT: prolonged pipeline protection effect of composition and manifested demulsification activity.

1 dwg, 5 tbl, 5 ex

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