CN212769888U

CN212769888U - Carbon dioxide drives oil field associated gas and retrieves combined system

Info

Publication number: CN212769888U
Application number: CN202021676807.4U
Authority: CN
Inventors: 王涛; 张春威; 李鹤; 杨博; 胡耀强; 韩建红; 鲍文; 孙晓
Original assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Current assignee: Shaanxi Yanchang Petroleum Group Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-03-23
Anticipated expiration: 2030-08-13

Abstract

The utility model discloses a carbon dioxide drives oil field associated gas and retrieves combined system, including consecutive compressor, gas preheater, adsorption bed, prefilter, membrane filter's the gas outlet connection that holds back has first CO₂The gas collection tank, the output gas outlet of the membrane filter is connected with a pressure swing adsorption device, and the top end and the side wall low end of the pressure swing adsorption device are respectively connected with a light hydrocarbon gas tank and a second CO₂A gas collection tank. Through the bookCO recovered by novel provided carbon dioxide flooding oilfield associated gas recovery combined system₂Can realize the recovery of CO when being injected into an oil area₂Closed circulation, near zero emission and certain environmental protection benefit.

Description

Carbon dioxide drives oil field associated gas and retrieves combined system

Technical Field

The utility model belongs to the technical field of carbon dioxide retrieves, concretely relates to carbon dioxide drives oil field associated gas and retrieves combined system.

Background

Carbon dioxide (CO)₂) Is a recognized greenhouse effect gas, and is currently dedicated to the research on the permanent disposal of CO in all countries of the world₂The method of (1). CO 2₂Geological sequestration is to dispose CO in large scale in future₂One of the effective measures of (1). Wherein CO is converted₂The injection into oil and gas reservoirs is an ideal burying technology at present, and not only CO is₂Large demand, safe storage and permanent CO isolation₂Can increase oil and gas production and has certain economic return to compensate CO₂Cost of separation, transportation and injection.

CO₂After injection into the formation, part of the CO is injected as the injection quantity and the injection age are increased₂The inevitable breakthrough of stratum is produced out of the ground along with associated gas, and CO is produced in as short as several months according to the engineering experience at home and abroad₂. How to produce CO₂Collecting and utilizing the waste water become problems to be solved urgently; and at present, no mature CO is produced at home₂The treatment and recovery process can be used for reference, and CO is extracted in the production process₂The gas quantity, pressure and component change range is large, the recovery treatment difficulty is high, the cost is high, the model selection difficulty of the compressor of the associated gas direct reinjection process is large, the reinjection and environmental protection requirements are met, and CO is economically and effectively carried out₂The recovery and utilization of the (C) is still an industry-recognized technical difficulty. Thus producing CO₂The recycling technology gradually becomes the current stateThe hot spot of internal and external research.

China has surpassed the United states and become CO₂The countries with the largest annual emissions, along with the countries CO₂The promotion of emission reduction targets and the environmental protection requirements are more and more strict, and the CCUS technology must be popularized on a large scale after the oil price is increased. CO 2₂After injection into the formation, part of the CO is injected as the injection quantity and the injection age are increased₂Inevitable breakthrough of stratum is produced out of the ground along with associated gas, and CO production is faced as short as several months and as long as 1 year₂Collection and utilization.

At present stage to CO₂Several methods for recovery include physical absorption, chemical absorption, pressure swing adsorption, membrane separation, etc., but the application conditions of the above centralized methods are different, and a single process is used for recovering CO₂The problems of inapplicable process, high cost, no economy and the like can occur in the oil field associated gas driving.

During the course of the discussion of the process systems, we have found that combining process systems is not simply a cumulative approach, but is counterproductive. For example: physical absorption cannot be used for CO₂The oil field associated gas is driven, the effect is poor, the foaming is easy, and the oil field associated gas can not be combined with other processes for application; the two methods of chemical absorption and pressure swing adsorption cannot be combined for application, cannot achieve separation effect, and are poor in economical efficiency.

SUMMERY OF THE UTILITY MODEL

To prior art's defect, the utility model provides a carbon dioxide drives oil field associated gas and retrieves combined system is applicable to CO₂The working condition of associated gas treatment in the middle stage of oil displacement production is particularly suitable for CO in the produced gas₂And when the medium concentration (30% -70%) is reached, the extraction amount reaches 31% -100% of the injection amount.

A carbon dioxide drives oil field associated gas and retrieves combined system, includes compressor, gas preheater, adsorption bed, prefilter, membrane filter that link to each other in proper order, membrane filter's interception gas exit linkage has first CO₂The gas collection tank, the output gas outlet of the membrane filter is connected with a pressure swing adsorption device, and the top end and the side wall low end of the pressure swing adsorption device are respectively connected with a light hydrocarbon gas tank and a second CO₂A gas collection tank.

Preferably, a condenser and a condensation filter are sequentially connected between the compressor and the gas preheater.

Preferably, the compressor is a piston compressor.

Preferably, the membrane filter is a membrane filter provided with a polyimide hollow fiber membrane.

The utility model has the advantages that:

(1) through the utility model provides a combined recovery system, the CO of recovery production₂Can realize the recovery of CO when being injected into an oil area₂Closed circulation, near zero emission and certain environmental protection benefit;

(2) recovery of produced CO₂The oil displacement agent is used for oil displacement of an oil field, and can improve the recovery ratio by 5 to 10 percent;

(3) recovery of produced CO₂The recycling of the carbon dioxide gas can reduce the transportation cost and the purchase cost of the carbon dioxide gas.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein, 1-associated gas, 2-compressor, 3-condenser, 4-condensation filter, 5-gas preheater, 6-adsorption bed, 7-prefilter, 8-membrane filter, 9-pressure swing adsorption device, 10-light hydrocarbon gas tank, 11-first CO₂Gas collection tank, 12-second CO₂A gas collection tank.

Detailed Description

Example 1

A carbon dioxide drives oil field associated gas and retrieves combined system, includes compressor 2, gas preheater 5, adsorption bed 6, prefilter 7, membrane filter 8 that link to each other in proper order, membrane filter 8 holds back gas exit linkage and has first CO₂A gas collection tank 11, wherein the output gas outlet of the membrane filter 8 is connected with a pressure swing adsorption device 9, and the top end and the side wall lower end of the pressure swing adsorption device 9 are respectively connected with a light hydrocarbon gas tank 10 and a second CO gas tank₂A vapor collection canister 12.

Example 2

On the basis of the embodiment 1, a condenser 3 and a condensation filter 4 are connected between the compressor 2 and the gas preheater 5 in sequence.

Example 3

On the basis of the embodiment 2, the compressor 2 is a piston compressor;

the membrane filter is provided with a polyimide hollow fiber membrane;

the adsorbent adopted in the pressure swing adsorption device is any one of carbon molecular sieve, activated carbon, silica gel and activated alumina;

the specific implementation process of this embodiment is as follows:

the recovery combined system is applied to CO₂The recovery treatment of associated gas in the injection area is carried out by using 10 ten thousand tons of CO₂Taking an example of a flooding demonstration area, the maximum scale of associated gas separation is 2400Nm³Hr, when CO₂Removing CO from oil field associated gas₂When the medium concentration (30% -70%) is reached and the extraction amount reaches 31% -100% of the injection amount, the associated gas 1 firstly passes through a piston compressor P_Into=0.1MPa，P_{Go out}=1.6 MPa, flow Q =2400Nm³The/hr, associated gas passes through behind compressor pressure boost to 1.6 MPa, after condenser 3 condensation, get into condensation filter 4 and filter heavy hydrocarbon and water, preheat through gas preheater 5 again, preheat to 20-30 ℃, then get into adsorption bed 6, particulate impurities such as dust are filtered in the adsorption, then reentrant prefilter 7, filter heavy hydrocarbon once more, prevent that the membrane from running into the heavy hydrocarbon and leading to membrane filter inefficacy, gas after filtering gets into membrane filter 8 and carries out coarse segregation, CO from the separation of membrane filter's entrapment gas export₂The rich gas enters the first CO₂The gas collecting tank 11, the light hydrocarbon rich gas separated from the output gas outlet of the membrane filter enters the pressure swing adsorption device 9, the separated product gas light hydrocarbon enters the light hydrocarbon gas tank 10 for the gas for daily life in the station through the adsorption and desorption of the pressure swing adsorption device, and the desorption gas high purity CO₂Into the second CO₂A gas collection tank 12;

when the condenser or the condensation filter breaks down, the associated gas directly enters the gas preheater after passing through the compressor;

the utility model provides a recovery system not only operatesSimple operation, low energy consumption, and overcomes the defect that the membrane separation method is only suitable for high-concentration CO₂The defects of low recovery and product purity are overcome, the defect of small treatment scale of the pressure swing adsorption decarbonization method is also overcome, and the recovered CO₂The gas can be pressurized by a compressor and delivered to CO₂The injection station merges into an injection line for reinjecting the formation.

Claims

1. The utility model provides a carbon dioxide drives oil field associated gas and retrieves combined system which characterized in that: comprises a compressor (2), a gas preheater (5), an adsorption bed (6), a prefilter (7) and a membrane filter (8) which are connected in sequence, wherein the outlet of the intercepted gas of the membrane filter (8) is connected with a first CO₂A gas collection tank (11), wherein the outlet of the produced gas of the membrane filter (8) is connected with a pressure swing adsorption device (9), and the top end and the side wall low end of the pressure swing adsorption device (9) are respectively connected with a light hydrocarbon gas tank (10) and a second CO₂A gas collection tank (12).

2. The carbon dioxide driven oilfield associated gas recovery combination system of claim 1, wherein: and a condenser (3) and a condensation filter (4) are sequentially connected between the compressor (2) and the gas preheater (5).

3. The carbon dioxide flooding oilfield associated gas recovery combination system of claim 2, wherein: the compressor (2) is a piston compressor.

4. The carbon dioxide driven oilfield associated gas recovery combination system of claim 3, wherein: the membrane filter (8) is a membrane filter provided with a polyimide hollow fiber membrane.