CN204678058U - A kind of low permeability gas field gathering system - Google Patents
A kind of low permeability gas field gathering system Download PDFInfo
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- CN204678058U CN204678058U CN201520187059.6U CN201520187059U CN204678058U CN 204678058 U CN204678058 U CN 204678058U CN 201520187059 U CN201520187059 U CN 201520187059U CN 204678058 U CN204678058 U CN 204678058U
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Abstract
The utility model relates to a kind of low permeability gas field gathering system, comprise multiple gas gathering station, multiple well clump and treatment plant, each well clump is communicated with gas gathering station by independent flow line, multiple gas gathering station is communicated to treatment plant by gas collection branch line, gas collecting main successively, be provided with gas gathering system in described gas gathering station, this gas gathering system comprises Duo Tiao gas gathering station inlet line, multiple separator, compressor and gas gathering station outlet line successively.This low permeability gas field gathering system of the present utility model and collecting and transporting method thereof, high pressure production is carried out in the requirement meeting conveying and process at the well clump initial stage, make full use of pressure energy and the temperature energy at gas well initial stage, reduce pipe diameter and hydrate inhibitor injection amount, middle and later periods low pressure is produced, and concentrate supercharging in gas gathering station, treatment plant focuses on, reduce the investment of gas field development ground and operating cost, gas gathering network construction is rationalized more.
Description
Technical field
The utility model relates to a kind of low permeability gas field gathering system and collecting and transporting method thereof, special adaptation gas field reservoir pressure depletion is fast, large well clump exploitation gas collection technique technology, that a kind of pressure high pressure in early stage that can make full use of stratum is produced, middle and later periods low pressure is produced, supercharging is concentrated, the gas collection technique that treatment plant focuses in gas gathering station.
Background technique
Gas field gathering system is made up of the gas field between well head to treatment plant inner gas gathering network, well site, gas gathering station etc., well head rock gas is collected by gas gathering network by this system, gas treatment plant is thereafter given after pretreatment, finally become qualified gas product, transport to downstream user outward.
Gas field gathering system is a complicated process system, and rock gas transports to treatment plant from well head multiple gathering and transportation technology.There are high-pressure gas collection technique, mesolow gas collection technique in current gas field according to the gas collection technique that development scheme is conventional.
High-pressure gas collection method, mainly be applicable to the gas field that output is high, production rate-maintenance capability is strong, carry out control high pressure from well head throttling to high pressure to output to produce, gas gathering station or treatment plant is delivered to by flow line, pressure adjustment is carried out according to outer defeated pressure in gas gathering station or treatment plant, focus on after Stress control, meet outer defeated commodity requirements for gas quality.
Current low permeability gas field many employings well clump development scheme, low yield low permeability gas field due to reservoir pressure depletion very fast, generally throttling arrangement is set at well head, adopts middle-low pressure gas collection technique, reduce pressure and reduce pipe network investment and hydrate inhibitor injection amount.In order to meet natural gas processing technique and the requirement of conveying to pressure, supercharging must be carried out to rock gas.Full gas field rock gas both can be concentrated on place supercharging by current natural gas boosting, also each for full gas field well rock gas can be concentrated on the supercharging of Duo Zuo gas gathering station respectively, even also dispersible at each wellhead supercharging.Concentrate after supercharging and be delivered to treatment plant and focus on, meet outer defeated commodity requirements for gas quality.
Large for low permeability gas field gas field scope, large well clump (well Cong Jing number is more), the distribution of well clump is relatively concentrated, if controlled by well head pressure at the beginning, reduce Cemented filling pressure, sharply increase because the more large-minded pressure of well Cong Jing number reduces rear flowline caliber, cause pipe network to invest and raise.Gas field produces the middle and later periods and reduces due to strata pressure, and tolerance reduces, and causes to gather gas pipe network capacity and greatly waste.If concentrate supercharging in treatment plant, cause whole gas field pipe network caliber in early stage large, middle and later periods pipe network affluence amount is large, the irrational phenomenon of whole Gas field construction.
And, by controlling to carry out mesolow production in well head pressure, causing gas well initial stage pressure energy and temperature to waste, improve gas field development energy consumption, add development cost.
Model utility content
The purpose of this utility model overcomes existing low permeability gas field gathering and transportation technology, whole gas field pipe network caliber in early stage is large, and middle and later periods pipe network affluence amount is large, the irrational phenomenon of whole Gas field construction, reduce the investment of gas field development ground and operating cost, gas gathering network construction is rationalized more.
For this reason, the utility model provides a kind of low permeability gas field gathering system, comprise multiple gas gathering station, multiple well clump and treatment plant, each well clump is communicated with gas gathering station by independent flow line, multiple gas gathering station is communicated to treatment plant by gas collection branch line, gas collecting main successively, be provided with gas gathering system in described gas gathering station, this gas gathering system comprises Duo Tiao gas gathering station inlet line, multiple separator, compressor and gas gathering station outlet line successively;
The end of each gas gathering station inlet line described is divided into two by-pass lines, wherein a by-pass line is connected to each separator respectively after separator import block valve, and another by-pass line is connected to each separator respectively after flow process switching valve group block valve;
The outlet of described separator is divided into two branch roads, article one, branch road is connected to gas gathering station outlet line after separator outlet block valve, another branch road is connected to compressor after compressor inlet block valve, and the outlet of compressor is connected to gas gathering station outlet line.
Each described gas gathering station inlet line is provided with second emergency shutdown valve, described gas gathering station outlet line is provided with the 3rd emergency shutdown valve and second gauge.
Described well clump place is christmas tree, and the outlet line of christmas tree is connected to flow line, the outlet line of described christmas tree is provided with well head throttle valve and first-class gauge, described flow line is provided with the first emergency shutdown valve.
The beneficial effects of the utility model: this low permeability gas field gathering system of the present utility model and collecting and transporting method thereof, high pressure production is carried out in the requirement meeting conveying and process at the well clump initial stage, make full use of pressure energy and the temperature energy at gas well initial stage, reduce pipe diameter and hydrate inhibitor injection amount, middle and later periods low pressure is produced, and concentrate supercharging in gas gathering station, treatment plant focuses on, reduce the investment of gas field development ground and operating cost, gas gathering network construction is rationalized more.
Below with reference to accompanying drawing, the utility model is described in further details.
Accompanying drawing explanation
Fig. 1 is the utility model gathering system technique general flow chart.
Fig. 2 is well head process flow diagram.
Tu3Shi gas gathering station process flow diagram.
Description of reference numerals: 1, gas gathering station; 2, well clump; 3, flow line; 4, gas collection branch line; 5, gas collecting main; 6, treatment plant; 7, christmas tree; 8, well head throttle valve; 9, first-class gauge; 10, the first emergency shutdown valve; 11, the second emergency shutdown valve; 12, separator import block valve; 13, flow process switching valve group block valve; 14, separator; 15, separator outlet block valve; 16, compressor inlet block valve; 17, second gauge; 18, the 3rd emergency shutdown valve; 19, compressor.
Embodiment
Embodiment 1:
The present embodiment provides a kind of low permeability gas field gathering system, as shown in Figure 1, comprise multiple gas gathering station 1, multiple well clump 2 and treatment plant 6, each well clump 2 is communicated with gas gathering station 1 by independent flow line 3, multiple gas gathering station 1 is communicated to treatment plant 6 by gas collection branch line 4, gas collecting main 5 successively, be provided with gas gathering system in described gas gathering station 1, as shown in Figure 3, this gas gathering system comprises Duo Tiao gas gathering station inlet line, multiple separator 14, compressor 19 and gas gathering station outlet line successively;
The end of each gas gathering station inlet line is divided into two by-pass lines, wherein a by-pass line is connected to each separator 14 respectively after separator import block valve 12, and another by-pass line is connected to each separator 14 respectively after flow process switching valve group block valve 13;
The outlet of separator 14 is divided into two branch roads, article one, branch road is connected to gas gathering station outlet line after separator outlet block valve 15, another branch road is connected to compressor 19 after compressor inlet block valve 16, and the outlet of compressor 19 is connected to gas gathering station outlet line.
Well clump 2 is generally made up of 8-16 mouth natural gas well, controls well head stream pressure during initial production by well head throttle valve 8, and pilot pressure is to meet the outer defeated requirement for the treatment of plant 6.Gas gathering station 1 is delivered to by flow line 3, in gas gathering station 1, rock gas enters separator 14 by separator import block valve 12, initial gross separation is carried out in separator 14, after being separated, rock gas leads to gas collection branch line 4 by gas gathering station outlet line and is pooled to gas collecting main 5, is delivered to treatment plant 6 processes by gas collecting main 5.
Middle and later periods reduces due to strata pressure, well head throttle valve 8 standard-sized sheet, and the pressure drop of well head stream is low cannot meet normal Production requirement, produces the middle and later periods, by carrying out low pressure production in gas gathering station supercharging in units of well clump in gas field.Strata pressure reduces comparatively slow or later development well and can meet production requirement and proceed well clump high pressure and produce.Middle and later periods is when producing, gas gathering station 1 is delivered to by flow line 3, in gas gathering station 1, low pressure separator 14 is entered by flow process switching valve group block valve 13, in separator 14, carry out initial gross separation, the rear rock gas of separation enters compressor 19 by compressor inlet block valve 16 and carries out supercharging, mixes after supercharging with high-pressure well clump separator outlet block valve 15 gas, lead to gas collection branch line 4 after mixing and be pooled to gas collecting main 5, be delivered to treatment plant 6 by gas collecting main 5 and process.
Embodiment 2:
Each gas gathering station inlet line is provided with second emergency shutdown valve 11, described gas gathering station outlet line is provided with the 3rd emergency shutdown valve 18 and second gauge 17.Rock gas first by the second emergency shutdown valve 11, enters separator 14 by separator import block valve 12; Rock gas, by after separator outlet block valve 15, leads to gas collection branch line through the 3rd emergency shutdown valve 18 and is pooled to gas collecting main 5, be delivered to treatment plant 6 process by gas collecting main 5 after flowmeter 17 measures.
As shown in Figure 2, well clump 2 place is christmas tree 7, and the outlet line of christmas tree 7 is connected to flow line 3, the outlet line of described christmas tree 7 is provided with well head throttle valve 8 and first-class gauge 9, described flow line 3 is provided with the first emergency shutdown valve 10.
In the initial production stage, well head pressure is higher, and rock gas from christmas tree 7, through flowmeter 9, then exports the first emergency shutdown valve 10 by well site and enters flow line 3 after well head throttle valve 8 pairs of pressure control;
Production phase middle and later periods, well head pressure reduces, and by standard-sized sheet well head throttle valve 8, does not control pressure, through flowmeter 9, then enters flow line 3 by well site first emergency shutdown valve 10.
Embodiment 3:
The present embodiment provides a kind of collecting and transporting method of low permeability gas field gathering system, comprises the steps:
In the initial production stage: the initial stage makes full use of pressure energy and the temperature energy of gas well, high pressure is produced and is reduced conveyance conduit caliber and hydrate inhibitor injection amount.According to pressure requirements, select the aperture of well head throttle valve 8, closing flow path switching valve group block valve 13 and compressor inlet block valve 16, make rock gas successively through well head throttle valve 8, first-class gauge 9, first emergency shutdown valve 10, second emergency shutdown valve 11, separator import block valve 12, separator 14, separator outlet block valve 15, second gauge 17, the 3rd emergency shutdown valve 18, gas collection branch line 4, gas collecting main 5, be delivered to treatment plant 6 and process;
The pressure regulation stage at initial stage: by the pressure regulating the aperture of well head throttle valve 8 to regulate rock gas, then the feed flow of rock gas is ensured, in running, throttle valve opening opens to standard-sized sheet gradually, by regulating well head throttle valve opening to extend the high pressure production time, reduces energy consumption;
Production phase middle and later periods: the middle and later periods reduces due to strata pressure, well head stream pressure is lower, pressure all opened by throttle valve cannot meet outer defeated requirement, therefore well head throttle valve 8 standard-sized sheet, select a separator 14 as low pressure separator, separator 14 upstream as low pressure separator is communicated with flow process switching valve group block valve 13, communicating downstream compressor inlet block valve 16, remaining separator 14 is still as high-pressure separator, upstream is communicated with separator import block valve 12, communicating downstream separator outlet block valve 15;
Separator import block valve 12 in the gas gathering station inlet line that atmospheric pressure is not up to standard is in the future closed, open flow process switching valve group block valve 13, natural gas via is crossed flow process switching valve group block valve 13 and is entered low pressure separator, then after compressor inlet block valve 16, compressor 19 is entered, enter gas gathering station outlet line after compression, be finally delivered to treatment plant 6 and process;
For carrying out atmospheric pressure gas gathering station inlet line up to standard, still entering high-pressure separator by separator import block valve 12, out entering gas gathering station outlet line afterwards by high-pressure separator, be finally delivered to treatment plant 6 and process;
Pressure regulation stage middle and later periods: along with the reduction of each well clump 2 pressure, according to traffic demand, successively each high-pressure separator is all converted into low pressure separator, finally all rock gases enter gas gathering station outlet line after all being pressurizeed by compressor 19, are finally delivered to treatment plant 6 and process.
The pressure requirements in above-mentioned initial production stage is the conveying for the treatment of plant 6 and the pressure requirements of process; Described production phase middle and later periods atmospheric pressure finger pressure up to standard is lower than the pressure requirements carried and process.
In sum, because stratum initial stage stream is pressed and stream temperature is relatively high, make full use of strata pressure and initial stage temperature, improve individual well pressure, reduce flowline caliber, the initial stage adopts not pressure-increasing unit, focuses in treatment plant.By regulating well head throttle valve opening to extend the high pressure production time, reduce energy consumption.Reduce all gradually in high pressure production phase well head stream pressure and temperature, well yield is the process progressively reduced from stable yields to output.
Middle and later periods reduces due to strata pressure, and well head stream pressure is lower, and pressure all opened by throttle valve cannot meet outer defeated requirement, carries out concentrated supercharging in gas gathering station, reduces well head pressure sustained low pressure produce by compressor.When low pressure is produced, individual well is all reduced by high pressure production output and pressure, and less expensive reasonably runs by flow line, avoids the problem that the rich amount of pipeline network construction middle and later periods operation is large.
More than exemplifying is only illustrate of the present utility model, does not form the restriction to protection domain of the present utility model, everyly all belongs within protection domain of the present utility model with the same or analogous design of the utility model.
Claims (3)
1. a low permeability gas field gathering system, comprise multiple gas gathering station (1), multiple well clump (2) and treatment plant (6), each well clump (2) is communicated with gas gathering station (1) by independent flow line (3), multiple gas gathering station (1) is communicated to treatment plant (6) by gas collection branch line (4), gas collecting main (5) successively, it is characterized in that: be provided with gas gathering system in described gas gathering station (1), this gas gathering system comprises Duo Tiao gas gathering station inlet line, multiple separator (14), compressor (19) and gas gathering station outlet line successively;
The end of each gas gathering station inlet line described is divided into two by-pass lines, wherein a by-pass line is connected to each separator (14) respectively after separator import block valve (12), and another by-pass line is connected to each separator (14) respectively after flow process switching valve group block valve (13);
The outlet of described separator (14) is divided into two branch roads, article one, branch road is connected to gas gathering station outlet line after separator outlet block valve (15), another branch road is connected to compressor (19) after compressor inlet block valve (16), and the outlet of compressor (19) is connected to gas gathering station outlet line.
2. low permeability gas field gathering system as claimed in claim 1, it is characterized in that: each described gas gathering station inlet line is provided with second emergency shutdown valve (11), described gas gathering station outlet line is provided with the 3rd emergency shutdown valve (18) and second gauge (17).
3. low permeability gas field gathering system as claimed in claim 2, it is characterized in that: described well clump (2) place is christmas tree (7), the outlet line of christmas tree (7) is connected to flow line (3), the outlet line of described christmas tree (7) is provided with well head throttle valve (8) and first-class gauge (9), described flow line (3) is provided with the first emergency shutdown valve (10).
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| CN201520187059.6U CN204678058U (en) | 2015-03-31 | 2015-03-31 | A kind of low permeability gas field gathering system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104728604A (en) * | 2015-03-31 | 2015-06-24 | 西安长庆科技工程有限责任公司 | Low-permeability gas field gathering and transmitting system and gathering and transmitting method thereof |
| CN105605426A (en) * | 2016-03-01 | 2016-05-25 | 中国石油大学(北京) | Multi-pipe gas collecting and delivering system and flow control algorithm applied to the same |
-
2015
- 2015-03-31 CN CN201520187059.6U patent/CN204678058U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104728604A (en) * | 2015-03-31 | 2015-06-24 | 西安长庆科技工程有限责任公司 | Low-permeability gas field gathering and transmitting system and gathering and transmitting method thereof |
| CN105605426A (en) * | 2016-03-01 | 2016-05-25 | 中国石油大学(北京) | Multi-pipe gas collecting and delivering system and flow control algorithm applied to the same |
| CN105605426B (en) * | 2016-03-01 | 2017-12-22 | 中国石油大学(北京) | A kind of gas multi-pipeline gathering system and the flow control methods applied to the system |
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