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Pressurizing mixed-conveying device of oil field associated gas and recovering method thereof

A technology of oilfield associated gas and recovery method, which is applied in the pressurized mixed transportation device of oilfield associated gas and its recovery field, which can solve the problems of low recovery utilization rate, high recovery cost, environmental pollution, etc., and achieve low recovery cost and good economy Benefits, Pollution Reduction Effects

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: in the actual production of the oil field, it is difficult to collect and recover the associated gas at the oil production well site, the recovery cost is high, and the recovery utilization rate is low
Directly discharged or discharged into the atmosphere after combustion will cause environmental pollution and other problems

Method used

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  • Pressurizing mixed-conveying device of oil field associated gas and recovering method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] see figure 1 , a pressurized mixed transportation device for associated gas in an oil field, comprising an associated gas delivery pipe 1, the associated gas delivery pipe 1 is connected to an associated gas bypass pipe 2, the associated gas bypass pipe 2 is connected to an oil delivery pipe 3, and the associated gas delivery pipe 1 is connected to a cooling 4, the cooler 4 is connected to the compressor 5, the compressor 5 is connected to the associated gas bypass pipe 2, and the oil delivery pipe 3 is connected to the compressor 5 through the cooler 4.

[0026] A method for recovering associated gas in an oil field by using a pressurized mixed transportation device, comprising the following steps: mixing the associated gas escaped from the oil well with all or part of the crude oil from the wellhead and then injecting it into the oil pipeline, and the associated gas is mixed with the crude oil and transported to the gathering and transportation stand.

[0027] Utiliz...

Embodiment 2

[0029] Present embodiment is on the basis of embodiment 1, and control valve is set on each pipeline, specifically narrates as follows:

[0030] see figure 1 , the associated gas delivery pipe 1 is sequentially provided with a stop valve a6, a pressure transmitter a7, a solenoid valve a8, a one-way valve a9 and a pressure reducing valve 10, the pressure reducing valve 10 is connected to the cooler 4, and the cooler 4 passes through the solenoid valve in turn b17, one-way valve b16 and pressure transmitter b15 are connected to the oil delivery pipe 3, and the associated gas bypass pipe 2 is provided with a one-way valve d11 and a stop valve c19 in sequence, and the compressor 5 is connected to the one-way valve through a one-way valve c12 On the associated gas bypass pipe 2 between d11 and the stop valve c19, on the oil delivery pipe 3 between the pressure transmitter b15 and the stop valve c13, there is a constant pressure check valve 18, and the oil delivery pipe 3 is respect...

Embodiment 3

[0036] This embodiment is based on embodiment 2, see figure 1 , through the frequency converter 13 to control the opening and displacement of the compressor 5, the purpose of automation and energy saving can be realized. The device of this embodiment also includes PLC (Programmable Logic Controller, programmable logic controller), when the pressure value of pressure transmitter a is less than the pressure value of pressure transmitter b, the PLC is used to compare the pressure according to this The value controls solenoid valve a, solenoid valve b and frequency converter to open.

[0037] A method for recovering oilfield associated gas by using a pressurized mixing device, comprising the following steps:

[0038] When the pressure of the associated gas is greater than the pressure of the oil pipeline, the associated gas enters the associated gas delivery pipe through the stop valve a. At this time, the solenoid valve a is closed, the compressor does not work, and the associat...

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Abstract

The invention discloses a pressurizing mixed-conveying device of oil field associated gas, which comprises an associated gas conveying tube connected with an associated gas bypass tube, and the associated gas bypass tube is connected with an oil conveying tube. The associated gas conveying tube is connected with an oil and gas mixer, the oil and gas mixer is connected with a compressor which is respectively connected with a lubricating device and the associated gas bypass tube, and the oil conveying tube is connected with the oil gas mixer through a buffer pool. A revering method of the oil field associated gas includes that: mixing the associated gas escaped form an oil field with all or partial crude oil from a mouth of a well and filling the mixed gas and oil into the oil conveying tube. Then the associated gas is conveyed to a collecting and conveying station along with the crude oil. The pressurizing mixed-conveying device of oil field associated gas and the recovering method of the oil field associated gas has the advantages of being low in recovering cost, and capable of saving energy and protecting the environment.

Description

technical field [0001] The invention relates to the fields of oil recovery technology and energy recovery and utilization, in particular to a pressurized mixed transportation device for oil field associated gas and a recovery method thereof. Background technique [0002] Oil well associated gas is the gas that escapes along with crude oil during oil extraction. It is partially dissolved in crude oil. In addition to more methane and ethane, it also contains a small amount of volatile liquid hydrocarbons and trace amounts of carbon dioxide, nitrogen, and hydrogen sulfide. It is a good combustible gas. [0003] Associated gas in an oil well escapes from the crude oil and builds up pressure in the casing annulus and associated tubing. When the downhole associated gas pressure increases to a certain value, the volumetric efficiency of the well pump will be affected, and even the phenomenon of "air lock" will appear, resulting in a decrease in crude oil production. Therefore, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00F17D1/02F17D1/08
Inventor 朱天寿李红才李治辉郑德贵徐庆武福丽方建国毛勇龚万福
Owner PETROCHINA CO LTD