RU2372553C1 - Device for transportation of gas and gas condensate in system well-gas pipeline (trail) - Google Patents

Abstract

FIELD: oil and gas production.

SUBSTANCE: device for transaportation of gas and gas condensate in system "well-gas pipeline (trail)" including wells with mouths, connected by pipelines to storage tank-collector, communicated to gas pipeline, unit of feeding of hydrate inhibitor - methanol into cavity of gas pipeline, consisting of hydraulic pump with suction and delivery pipes, connected by pipelines correspondingly to source of methanol and through pilot valve to gas pipeline, is outfitted by parallel connected to main pipe of methanol feeding into gas pipeline by polymeric module, containing polyox, implemented in the form of cylinder, cavity of which is separated by installed in it piston for two cavities, one of which is communicated by pipeline through throttle with delivery pipe of hydraulic pump, and other cavity is filled by polymer ink.

EFFECT: improvement of carrying out conditions from wells of condensation water mixture and stratal liquid from zone of bottom, and increasing of transmission capacity of gas pipeline by means of reduction of its flow resistance.

3 cl, 1 dwg

Description

The invention relates to the field of mining, in particular to the production of gas and gas condensate, and relates to the issue of increasing the productivity of production wells.

A device is known for transporting gas and gas condensate from a production well, including wells with mouths connected by pipelines to a collector — a raw material collector in communication with a gas pipeline (loop), a hydrate inhibitor supply unit supplied to a gas cavity to prevent hydrates from being generated during transportation of gas and gas condensate, consisting of a hydraulic pump with suction and pressure nozzles connected respectively to a source of methanol and through an adjustable valve from the gas pipeline odom (see ed. St. SU No. 1393901 dated 05/07/1988 - prototype).

However, in the known device, along with the presence of hydrate formation at the beginning of the gas pipeline, which is reduced by the introduction of methanol into the cavity of the gas pipeline, there is an increased pressure drop between the initial and final points of the gas pipeline due to large hydraulic losses in it. As a result of this, the removal of water from the bottom of the wells and removal of the water-condensate mixture from the wells, as well as the transportation of gas through the pipeline, are not effective enough. This leads to a decrease in gas throughput. As a result, gas extraction and its production volume are reduced, and, consequently, well productivity.

The objective of the invention is to increase the debit (productivity) of gas and gas condensate wells by improving the conditions for removal from the wells of water-condensed mixture and reservoir fluid from the bottomhole zone and increasing the throughput of the pipeline by reducing its hydraulic resistance.

To do this, the known device for transporting gas and gas condensate in the "well - gas pipeline (plume)" system, including wells with mouths connected by pipelines to a collector connected to the gas pipeline, a hydrate inhibitor supply unit - methanol to the gas cavity, consisting of a hydraulic pump with According to the invention, the suction and pressure pipes connected by pipelines respectively to a methanol source and through a control valve with a gas pipeline are equipped with methanol supply to the gas pipeline by a polymer module made in the form of a cylinder, the cavity of which is divided by a piston installed in it into two cavities, one of which is connected by a pipe through a throttle with a pressure head of the hydraulic pump, and the other cavity is filled with polymer paste and communicated by a pipeline through a non-return valve with a suction pipe a hydraulic pump, at the same time, at the point where the pressure pipe of the hydraulic pump enters the pipeline, a sprayer of the mixture of methanol and polymer supplied to the gas pipeline is installed.

In addition, the spray of a mixture of methanol with polymer is made in the form of a centrifugal nozzle.

Along with this, the cylinder of the polymer module is made in the form of a replaceable cartridge with a piston filled with polymer paste.

The device is supplied with a polymer module by introducing a small amount of polymer additives mixed with methanol into the pipeline, a significant reduction in hydraulic resistance and thereby reducing hydraulic losses in the pipeline, as well as suppressing the process of hydration in the gas pipeline.

Parallel connection of the polymer module to the methanol supply unit in the gas pipeline cavity with the supply of polymer additives immediately before the hydraulic pump, that is, into the hydraulic pump suction pipe, allows for high-quality mixing of the polymer with methanol to obtain a mixture fed into the gas cavity, which dissolves better in the gas condensate medium, than in it a single polymer.

In addition, using the elements in the polymer module line, the required polymer dose is supplied corresponding to the amount of methanol supplied to the gas pipeline and the quality of the mixture of these components obtained.

The execution of the polymer module in the form of a replaceable cartridge with a piston filled with polymer paste allows the gas pipeline to operate in the “forced” mode in emergency situations.

The presence of a spray of a mixture of methanol with a polymer installed at the inlet of the mixture into the gas pipeline makes it possible to efficiently mix the mixture of these components with a gas condensate medium in the gas pipeline and thereby provide an additional reduction in the hydraulic resistance of the gas pipeline. As a result, both the rate of hydrate formation and the hydraulic resistance in the gas pipeline are reduced.

Moreover, as shown by the results of experiments, when a mixture of a polymer additive and methanol of appropriate volumes is introduced into the gas pipeline, the effect of reducing hydraulic losses in the gas pipeline, and consequently, an increase in gas consumption from the combined effect of both components simultaneously, is achieved to a greater extent than the effect of the reduction hydraulic losses obtained when using each component individually at the same doses administered.

The invention is illustrated in the drawing, which shows the proposed device.

The device includes wells 1 with mouths connected by pipelines (not shown) with a collector-collector 2 in communication with gas pipeline 3. Gas pipeline 3 is equipped with a hydrate inhibitor supply unit - methanol to the cavity of gas pipeline 3, consisting of a hydraulic pump 4 having a suction 5 and a pressure head 6 pipe connected by pipelines 7, 8, respectively, with a source of methanol 9 and through a control valve 10 with a gas pipeline 3.

To reduce hydraulic losses in the gas pipeline 3, the device is equipped with a polymer module 11 connected in parallel to the methanol supply line to the gas pipeline, made in the form of a cylinder 12, the cavity of which is divided by the piston 13 installed in it into two cavities: cavity “a” and cavity “b”. The cavity "a" is communicated through the throttle 14 by a pipe 15 with a pressure pipe 6 at the inlet of the hydraulic pump 4, and the cavity "b" is filled with polymer paste and communicated by the pipe 16 through a non-return valve 17 with a suction pipe 5 at the inlet of the hydraulic pump 4. At the inlet of the pipeline 8 of the hydraulic pump 4 into the cavity of the gas pipeline 3 there is a sprayer 18 of a mixture of methanol with polymer supplied to the gas pipeline 3. The spray mixture 18 can be made in the form of a centrifugal nozzle. In this case, the cylinder 12 of the polymer module 11 is made in the form of a replaceable cartridge with a piston 13 filled with polymer paste.

The operation of the device is as follows.

Natural gas from wells 1 is transported through pipelines to a collector 2 through its mouths, from where it enters the gas pipeline 3, into which a mixture of a polymer additive with methanol is introduced through pipeline 8.

To supply the specified mixture, when opening the throttle 14, the methanol pumped by the hydraulic pump 4 due to the pressure difference between the pressure 6 and the suction 5 nozzles of the pump 4 enters through the cavity 15 into the cavity "a" of the polymer module 11. Due to the specified pressure difference, the piston 13, displacing, displaces from the cavity "b" the polymer paste, which through the pipe 16 through the non-return valve 17 enters the suction pipe 5 at the inlet of the hydraulic pump 4. Mixing with the flow of methanol in the hydraulic pump 4, the polymer paste enters through the pipeline 8 through a control valve 10 into the cavity of the gas pipeline 3 in the form of a mixture of polymer with methanol, previously dispersed using a mixture of atomizer 18 installed at the injection site of the specified mixture into the cavity of the gas pipeline 3. As a result, there is a high-quality distribution of the mixture of methanol and polymer additive with gas condensate transported through the gas pipeline and as a consequence of this, an effective reduction in the hydraulic resistance of the gas main. The required volumetric flow rate of the polymer additive in methanol is determined by the differential pressure and is implemented using a throttle 14. A non-return valve 17 eliminates the chance of methanol entering the polymer cartridge 11, preventing the polymer from becoming prematurely saturated with methanol in the cartridge.

A dispersed mixture of methanol with a polymer additive entering the gas pipeline creates conditions for reducing hydrate formation and effectively reducing the hydraulic losses of the gas condensate system.

A hydrodynamically active polymer additive mixed with methanol in water significantly suppresses the processes of turbulent heat and mass transfer, which leads to a slowdown in the cooling of gas-water mixtures in the pipeline and to a significant decrease in hydraulic resistance (3-4 times). This circumstance increases the rate of water removal from the pipeline, and also reduces the pressure in the pipeline, and therefore, reduces the hydrate formation factor and helps to increase the throughput of the "well - gas pipeline (loop)" system.

The results of field tests using methanol and a polymer additive - polyox, tested on the existing wells of the Yamburg gas condensate field, are presented in the table.

Table. The contents of the operation Well pressure, MPa Installation pressure, MPa The increase in gas consumption, m ³ / day Note Methanol injection. 1.8 1.45 15,000 After processing the plume with a solution, the effect lasted 15 days in winter Injection of a 0.1% aqueous solution of polyox. 2.0 1.61 400 After processing the plume with a solution, the effect lasted for 5 days in winter Injection of a 0.1% solution of polyox in methanol. 1.6 1.35 20000 After processing the plume with a solution, the effect lasted in the winter for 20 days

The tests were carried out with the length of the gas pipeline from the collector to the gas treatment unit (UPG) at 9000 m with a pipe diameter of 0.5 m for three options for supplying inhibitors:

a) methanol;

b) 0.1% aqueous solution of polyox;

c) 0.1% solution of polyoxide in methanol.

It can be seen from the table that the use of a mixture of polyoxide with methanol in a given concentration range is higher than the effect obtained from the sum of the effects of individual components.

Claims (3)

1. A device for transporting gas and gas condensate in the "well-gas pipeline (loop)" system, including wells with mouths connected by pipelines to a collector-collector in communication with the gas pipeline, a hydrate inhibitor supply unit - methanol to the gas cavity, consisting of a hydraulic pump with a suction and pressure nozzles connected by pipelines respectively to a source of methanol and through a control valve with a gas pipeline, characterized in that it is provided with a parallel connected to the supply line methanol into the gas pipeline with a polymer module containing predominantly polyox, made in the form of a cylinder, the cavity of which is divided by a piston installed in it into two cavities, one of which is connected by a pipe through a throttle with a pressure head of the hydraulic pump, and the other cavity is filled with polymer paste and communicated by a pipe through a non-return valve with a suction nozzle of the hydraulic pump, while in the place where the pressure pipe of the hydraulic pump is introduced into the cavity of the gas pipeline, a sprayer is supplied to the gas pipeline with a mixture of methanol with a polymer. 2. The device for transporting gas and gas condensate according to claim 1, characterized in that the atomizer of the mixture of methanol with polymer is made in the form of a centrifugal nozzle. 3. The device for transporting gas and gas condensate according to claim 1, characterized in that the cylinder of the polymer module is made in the form of a replaceable cartridge with a piston filled with polymer paste.

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