CN-121988061-A - Skid-mounted crude oil associated gas condensate recovery system and recovery method

CN121988061ACN 121988061 ACN121988061 ACN 121988061ACN-121988061-A

Abstract

The invention belongs to the technical field of associated gas condensate recovery, and particularly relates to a skid-mounted crude oil associated gas condensate recovery system and a recovery method. The recovery system comprises a sledge seat, an equipment body, a secondary liquid separation device and a condensate recovery device, wherein the equipment body is arranged on the sledge seat and comprises a gas-liquid separation device, a liquid separation bag is arranged at one end of the equipment body, an air cooling device is communicated with an outlet of the liquid separation bag, an outlet of the air cooling device is communicated with the secondary liquid separation device, an outer conveying pipeline is communicated with the equipment body, the secondary liquid separation device is arranged at the top of the equipment body, and a partition plate is arranged at the lower part of the equipment body. The device body and the secondary liquid separating device are separated by the partition plate, so that the device body and the secondary liquid separating device are formed into two independent pressure containers, the pressure interference between the two independent pressure containers is avoided, the condensate is collected to the liquid storage tank in the condensate recovery device and then is directly conveyed to the outer conveying pipeline through the pump, the airtight collection and conveying are realized, and the problems that the skid-mounted crude oil supercharging outer conveying device is difficult in recovering the gas condensate and cannot convey the gas condensate to the outer conveying pipeline under pressure are solved.

Inventors

TAN KAI
ZHANG MAI
LIU XINYU
FENG LELE
ZHANG YANLI
DONG YANGUO
LI YONGSHENG
YANG JIANDONG
JIA HAIHAI
XU DONG
ZHAO PENG
LI XINXIN
LIANG JIANHUA

Assignees

长庆工程设计有限公司
中国石油天然气集团有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The skid-mounted crude oil associated gas condensate recovery system is characterized by comprising a skid seat, an equipment body arranged on the skid seat, a secondary liquid separation device and a condensate recovery device, wherein the equipment body comprises a gas-liquid separation device, one end of the equipment body is provided with a liquid separation bag, the liquid separation bag is communicated with an air cooling device, an outlet of the air cooling device is communicated with the secondary liquid separation device, and the equipment body is communicated with an output pipeline; The secondary liquid separation device is arranged at the top of the equipment body, a partition plate is arranged at the lower part of the secondary liquid separation device and is used for separating the equipment body from the secondary liquid separation device, an outlet of the secondary liquid separation device is communicated with the condensate recovery device, and an outlet of the condensate recovery device is communicated with an outer conveying pipeline.
2. The skid-mounted crude oil associated gas condensate recovery system of claim 1, wherein the secondary liquid separation device comprises a cylinder, an inlet pipeline, an outlet pipeline, a baffle plate and a gas outlet, one end of the outlet pipeline penetrates through the baffle plate and is communicated with the cylinder, the other end of the outlet pipeline extends out of the cylinder and is communicated with the condensate recovery device, the inlet pipeline is arranged at the middle lower part of the cylinder, and the gas outlet is arranged at the upper part of the cylinder.
3. The skid-mounted crude oil associated gas condensate recovery system of claim 1, wherein the condensate recovery device comprises a shell, a liquid inlet pipeline and a liquid outlet pipeline, a controller is arranged outside the shell, a liquid storage tank, a drain valve, a filter, a motor and a booster pump are arranged in the shell, the liquid inlet pipeline is communicated with the liquid storage tank, a liquid level meter is arranged on the liquid storage tank, the booster pump is arranged between the liquid outlet pipeline and the liquid storage tank, and the motor and the liquid level meter of the booster pump are electrically connected with the controller.
4. The skid-mounted crude oil associated gas condensate recovery system of claim 1, wherein the condensate recovery device and the communicating pipe of the external pipeline are connected with a check valve and an open-close valve in series.
5. The skid-mounted crude oil associated gas condensate recovery system of claim 3, wherein the liquid inlet pipeline and the liquid outlet pipeline are respectively provided with a cooling and heat tracing mechanism.
6. The skid-mounted crude oil associated gas condensate recovery system of any one of claims 1-5, wherein a ladder platform and a hanging shaft are arranged on the skid base.
7. The skid-mounted crude oil associated gas condensate recovery system as recited in any one of claims 1-5, wherein an inlet pipeline of the secondary liquid separation device is a tangential connection pipe.
8. The method for recovering the condensate of the crude oil associated gas is characterized by comprising the following steps of: Step 1), carrying out primary gas-liquid separation on the heated crude oil in the equipment body, and enabling separated associated gas to enter a liquid separation bag, and then cooling the associated gas by an air cooling device and then entering a secondary liquid separation device; Step 2) carrying out gas-liquid separation on associated gas in a secondary liquid separation device, connecting the separated associated gas to the external transmission of a compressor through a gas outlet, enabling separated condensate to enter a condensate recovery device through an outlet pipeline, and finally enabling the condensate to enter an external transmission pipeline through a booster pump and be transmitted together with the treated crude oil; Heating the oil-gas mixture entering the equipment body by using the separated partial associated gas as fuel; a drain valve is arranged in front of the liquid storage tank, so that liquid is conveyed into the liquid storage tank when liquid exists in the liquid inlet pipeline.
9. The method for recovering condensate from crude oil associated gas of claim 8, wherein in the step 2), the condensate enters the condensate recovery device through the outlet pipeline, the liquid level meter detects the liquid level of the liquid storage tank in real time and sends the liquid level to the controller, when the liquid level reaches a set value, the controller sends a signal to the booster pump, the motor is started, and the booster pump conveys the condensate to the outer conveying pipeline for outer conveying.
10. The method for recovering condensate from crude oil associated gas of claim 8, wherein in the second gas-liquid separation process in step 2), the equipment body and the secondary liquid separation device are separated by a partition plate, so that two independent pressure containers are formed, and the condensate is externally conveyed.

Description

Skid-mounted crude oil associated gas condensate recovery system and recovery method Technical Field The invention belongs to the technical field of associated gas condensate recovery, and particularly relates to a skid-mounted crude oil associated gas condensate recovery system and a recovery method. Background The crude oil associated gas is gas which overflows along with pressure reduction and takes hydrocarbons as main components in the crude oil extraction process, the associated gas can be used as fuel to heat crude oil in the wax-containing crude oil conveying process, and condensate formed by liquefying heavy components in the associated gas can influence the normal combustion of a heating furnace when the temperature is reduced, so that the condensate must be separated before the associated gas enters a combustor. The patent CN208025139U is an oil-gas mixed transportation integrated device, which comprises a skid seat, a crude oil inlet and a crude oil outlet, wherein a combustor, a multifunctional container, a single-screw mixed transportation pump I, a single-screw mixed transportation pump II and a lubricating pump are arranged on the skid seat. The integrated functions of heating, buffering, separating, mixing and pressurizing and metering can be realized, the ground process flow is optimized, the equipment is reduced, and the requirements of oil-gas mixing and conveying, safety and environmental protection are met. In the technical scheme, the container body is separated from the liquid separating device by the partition plate, but in order to enable condensate to flow back into the container, the partition plate is connected with a communicating pipe, and holes are formed in the partition plate to keep pressure balance. In practical application, the liquid seal is formed at the position of the baffle plate, and because the gas pressure in the liquid separating device is smaller than that in the body, the liquid in the tank rises to the liquid separating device along the communicating pipe, so that the whole skid-mounted equipment cannot normally run. In order to solve the problem of condensate reflux, technicians adopt a method of drilling a plurality of holes on a baffle plate, so that part of gas can directly enter a liquid separating device from a container body, the liquid carrying amount of the gas reaching the top of the liquid separating device is obviously increased, and liquid accumulation is easy to generate in a subsequent pipeline. The patent CN212017068U relates to a condensate-liquid separation and collection device for associated gas, which comprises a gas-liquid separator, an air cooler, an associated gas separator, a liquid collecting plate, a downcomer, a separation buffer tank, crude oil and a drain valve, wherein the gas-liquid separator and the associated gas separator are arranged at the top end of the separation buffer tank, the air cooler is arranged between the gas-liquid separator and the associated gas separator, the liquid collecting plate is arranged at the inner lower part of the associated gas separator, the upper end of the downcomer is connected with the liquid collecting plate, the lower end of the downcomer is communicated with the drain valve arranged outside the separation buffer tank after passing through the bottom of the separation buffer tank, the separation buffer tank is provided with an oil-gas mixture inlet, and the lower part of the separation buffer tank is filled with crude oil. In the technical scheme, condensate is discharged from the liquid separation device through the downcomer, enters an external normal pressure environment through the drain valve and the pipeline, is easily gasified and volatilized in the later stage, and causes resource waste and environmental pollution. Disclosure of Invention The invention aims to provide a skid-mounted crude oil associated gas condensate recovery system, wherein a partition plate is arranged between a secondary liquid separation device and an equipment body to separate the secondary liquid separation device from the equipment body, so that the secondary liquid separation device and the equipment body are formed into two pressure containers, pressure interference among the secondary liquid separation device and the equipment body is avoided, condensate is collected to a liquid storage tank in the recovery device and then directly conveyed to an output pipeline through a pump, and closed collection and conveying are realized. The invention further aims to provide a crude oil associated gas condensate recovery method, which solves the technical problem that the recovery and the output of associated gas condensate in a crude oil output station are difficult. Therefore, the technical scheme provided by the invention is as follows: The skid-mounted crude oil associated gas condensate recovery system comprises a skid seat, an equipment body, a secondary liquid separation device and a condensate recovery devi