CN110882975A - Method for cleaning pipeline before production stop, inspection and maintenance of high-sulfur-content station - Google Patents
Method for cleaning pipeline before production stop, inspection and maintenance of high-sulfur-content station Download PDFInfo
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- CN110882975A CN110882975A CN201910842680.4A CN201910842680A CN110882975A CN 110882975 A CN110882975 A CN 110882975A CN 201910842680 A CN201910842680 A CN 201910842680A CN 110882975 A CN110882975 A CN 110882975A
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- 238000004140 cleaning Methods 0.000 title claims abstract description 413
- 238000000034 method Methods 0.000 title claims abstract description 88
- 238000012423 maintenance Methods 0.000 title claims abstract description 35
- 238000007689 inspection Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims description 108
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 285
- 239000007789 gas Substances 0.000 claims abstract description 132
- 239000003814 drug Substances 0.000 claims abstract description 94
- 239000003513 alkali Substances 0.000 claims abstract description 59
- 238000010926 purge Methods 0.000 claims abstract description 41
- 238000004332 deodorization Methods 0.000 claims abstract description 34
- 238000002161 passivation Methods 0.000 claims abstract description 30
- 239000002737 fuel gas Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 15
- 150000003568 thioethers Chemical class 0.000 claims abstract description 10
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 9
- 230000002265 prevention Effects 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 162
- 238000000926 separation method Methods 0.000 claims description 144
- 238000010438 heat treatment Methods 0.000 claims description 102
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 62
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 62
- 239000010865 sewage Substances 0.000 claims description 56
- 238000005406 washing Methods 0.000 claims description 52
- 239000002253 acid Substances 0.000 claims description 34
- 239000004576 sand Substances 0.000 claims description 32
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 8
- 210000002445 nipple Anatomy 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 239000002184 metal Substances 0.000 description 14
- 238000010998 test method Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 239000012535 impurity Substances 0.000 description 8
- 229910000975 Carbon steel Inorganic materials 0.000 description 7
- 239000010962 carbon steel Substances 0.000 description 7
- 238000009432 framing Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 230000000007 visual effect Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/007—Heating the liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/08—Details of machines or methods for cleaning containers, e.g. tanks
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention relates to a method for cleaning a process before shutdown, inspection and maintenance of a high-sulfur-content station, which is characterized by comprising the following steps of: a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit; b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished; c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units; d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning; e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment; f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again; g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
Description
Technical Field
The invention belongs to the field of gas production of high-sulfur-content gas fields, and particularly relates to a method for cleaning a pipeline before shutdown, inspection and maintenance of a high-sulfur-content station.
Background
In the process of gas production, a high-sulfur-content gas field is accompanied by deposition of a large amount of substances such as layer returns, elemental sulfur, corrosion inhibitors and the like in a ground gathering and transportation system to form a viscous sulfur-containing dirt substance. The scale substances are easy to deposit at the bottom of the container and at the throttling pressure drop position on the pipeline, so that the volume of equipment is reduced, the pipeline and the valve are blocked, the normal operation of a gas field gathering and transportation system is greatly influenced, and a field practical, efficient and clean high-sulfur-content station cleaning technology is urgently needed.
A document in journal of scientific and technical monograph is named as application of alkaline water cleaning and passivating agent soaking in the detection and maintenance operation of an acid gas field, and a method of alkaline water cleaning and passivating agent soaking is proposed in the document to clean the detection and maintenance operation of the acid gas field. After the alkali liquor is cleaned, the hydrogen sulfide content of the equipment container can be effectively reduced. However, this method has certain disadvantages: after the container or the pipeline is cleaned, particularly, a part of solid impurities such as rock debris returned from the stratum and an aggregate of sticky substances returned from the stratum still exist on the inner wall of the container, and the substances can be effectively removed by a flushing process such as high-pressure water jet and the like.
For example, the invention patent with the patent number of CN 103143533A and the name of cleaning and deblocking process for the gathering and transportation system of the high-sulfur-acid-content petroleum and natural gas field provides a cleaning and deblocking process for the gathering and transportation system of the high-sulfur-acid-content natural gas field with the functions of deodorization, passivation, chemical cleaning, deblocking and passivation protection, and the method provides a cleaning mode, wherein the easy-cleaning part of a container can be thoroughly cleaned, but viscous substances enriched on TP plates, grating plates and the like in a separator and a torch liquid-separating tank are difficult to clean thoroughly and cleanly; the invention provides' serious blockage of an elbow, a large-small reducing pipe, a tee joint and the like of a gathering and transportation system, and the blockage is heated and dissolved in an electromagnetic heating mode outside the gathering and transportation system, wherein the heating temperature is 70-90 ℃. The method heats through external equipment, and has relatively low heating efficiency and heavy workload due to relatively more elbows and large and small reducing positions in the process.
Disclosure of Invention
In order to optimize the process cleaning technology before the high-sulfur-content station production stopping, inspection and maintenance operation, ensure the cleaning quality and safety of the process before inspection and maintenance, and improve the progress of the station process inspection and maintenance operation, the invention proposes a detailed and complete process cleaning technology before the high-sulfur-content station production stopping, inspection and maintenance, which effectively reduces the working strength of a cleaning construction unit on the basis of the basic target of thorough cleaning of the process before the high-sulfur-content station inspection and maintenance operation is completed, and achieves the purposes of improving the working efficiency and the inspection and maintenance progress and ensuring the safety of operators during the inspection and maintenance.
Aiming at the defects in the prior art, the invention provides a method for cleaning a pipeline before production stop, inspection and maintenance of a high-sulfur-content station.
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60-80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step d, cleaning the pipeline subjected to alkali liquor deodorization for 3-5 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: detecting for multiple times within 5-10 minutes, collecting cleaning liquid, washing with clear water after cleaning, removing most impurities which can be washed away in the process, wherein the clear water washing requirement is that the final effluent quality is consistent with the influent quality, the pH value is less than 10, SS is less than 50, and the turbidity is less than 30.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
The invention has the beneficial effects that:
1. the invention adopts the modes of ' fuel gas replacement, 1 time of alkali liquor deodorization, 3 times of cleaning solution cleaning, 2 times of clear water washing, 1 time of passivation solution protection, high-pressure water jet cleaning, manual cleaning and ' medicament heating and circulating at the same time ' to realize the thorough cleaning of the flow before the production stoppage, the maintenance and the detection of the high-sulfur gas field station, the cleaning work before the detection and the maintenance of 5 high-sulfur gas wells of the rolling production engineering of the meta-dam gas field is finished at present, and the cleaning time of a single well is about 10 days.
2. The cleaning effect is good, the one-time success rate of the detection, maintenance and cleaning operation is 100%, sulfides and other impurities in the station are effectively removed, the cleaned effect meets the national standards GB/T25146-; the flow is not seriously blocked within 1 year of the cleaned station.
3. The method effectively improves the overhaul progress and ensures the overhaul safety after the process is cleaned. After the flow is cleaned, the maintenance personnel can inspect and maintain the station without wearing a back and air, so that a large amount of time is saved, the maintenance time is effectively shortened by 8 days according to the standard calculation of 30 days of maintenance of a single station, the maintenance progress is improved, and more importantly, the safety of the personnel is ensured.
4. The invention adopts the water jacket heating furnace equipment in the station to realize the purposes of heating and cleaning the medicament at the same time, always ensures that the medicament in the process reaches the optimum cleaning effect temperature of the medicament, and effectively ensures the best cleaning effect temperature of the medicament.
Drawings
FIG. 1 is a flow chart of the operation of the present invention.
Detailed Description
Example 1:
as shown in figure 1
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60-80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
Example 2:
as shown in figure 1
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step d, cleaning the pipeline subjected to alkali liquor deodorization for 3-5 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: detecting for multiple times within 5-10 minutes, collecting cleaning liquid, washing with clear water after cleaning, removing most impurities which can be washed away in the process, wherein the clear water washing requirement is that the final effluent quality is consistent with the influent quality, the pH value is less than 10, SS is less than 50, and the turbidity is less than 30.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
Example 3:
as shown in figure 1
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
①, igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step d, cleaning the pipeline subjected to alkali liquor deodorization for 3-5 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: detecting for multiple times within 5-10 minutes, collecting cleaning liquid, washing with clear water after cleaning, removing most impurities which can be washed away in the process, wherein the clear water washing requirement is that the final effluent quality is consistent with the influent quality, the pH value is less than 10, SS is less than 50, and the turbidity is less than 30.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
Example 4:
as shown in figure 1
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60-80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step d, cleaning the pipeline subjected to alkali liquor deodorization for 3 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: and (3) detecting for multiple times within 5 minutes, collecting the cleaning solution, and after cleaning, washing with clear water to remove most impurities which can be washed away in the process, wherein the clear water washing requirement is met, the final effluent quality is consistent with the influent quality, the pH value is less than 10, SS is less than 50, and the turbidity is less than 30.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
Example 5:
as shown in figure 1
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60-80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step d, cleaning the pipeline subjected to alkali liquor deodorization for 5 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: and detecting for multiple times within 10 minutes, collecting the cleaning solution, and after cleaning is finished, washing with clear water to remove most impurities which can be washed away in the process, wherein the water quality of the final outlet water is consistent with that of the inlet water, the pH value is less than 10, SS is less than 50, and the turbidity is less than 30.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
Example 6:
as shown in figure 1
A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
In the step a, all equipment and pipelines thereof are divided into the following cleaning units: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
In the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure gauge pressure relief port of the water separator, a pressure gauge pressure relief port behind a three-stage throttle valve of the water jacket heating furnace and a pressure gauge pressure relief port of the ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
The deodorization step related to the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60-80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
In the step d, cleaning the pipeline subjected to alkali liquor deodorization for 3-5 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: detecting for multiple times within 5-10 minutes, collecting cleaning liquid, washing with clear water after cleaning, removing most impurities which can be washed away in the process, wherein the clear water washing requirement is that the final effluent quality is consistent with the influent quality, the pH value is less than 10, SS is less than 50, and the turbidity is less than 30.
In the step f, a high-pressure water jet device is adopted to perform high-pressure water jet cleaning on the coil pipe of the water jacket furnace; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
The acceptance quality standard related to the step g is as follows: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
The national standard GB/T25146-; the corrosion rate of carbon steel is less than 6g/m2h, and the corrosion rate of stainless steel is less than 2g/m2 h; according to the related requirements in GB/T25148-2010, the descaling rate is more than or equal to 85%, the descaling rate test method adopts a visual cleaning method, after the cleaning operation is completed, the descaling effect on the cleaned surface is visually checked, and the descaling rate is qualified when no obvious dirt exists or the residual dirt amount is less than or equal to 15% visually; the cleaning rate is more than or equal to 85 percent, the cleaning rate test method adopts a point method, after finishing all cleaning work, the wall of the container is arbitrarily selected with three representative metal surfaces, the selected metal surfaces are framed by a flexible sampling frame of 10mm by 10mm, then the number and the diameter of residual scale points on the framing surface are observed, and the arithmetic mean value is taken for the measurement results of the three selected surfaces.
Claims (7)
1. A method for cleaning pipelines before shutdown, inspection and maintenance of a high-sulfur-content station is characterized by comprising the following steps:
a. firstly, dividing a cleaning unit, and then determining a medicament filling flow for the divided cleaning unit;
b. releasing pressure of all the divided cleaning units, purging and replacing the cleaning units with fuel gas after pressure in the gathering and transportation process is released to normal pressure, and respectively filling chemicals into gas collection pipelines of the divided cleaning units by conducting a gas well mouth after replacement is finished;
c. respectively introducing the alkali liquor into each cleaning unit, performing cyclic deodorization, and removing sulfides in the cleaning units;
d. respectively introducing the cleaning solution into the cleaning units cleaned by the alkali liquor for circular cleaning;
e. respectively introducing the passivation solution into the cleaning units circularly cleaned by the cleaning solution to perform anti-passivation treatment;
f. respectively introducing the high-pressure water jet into the cleaning units subjected to passivation prevention treatment, and performing jet cleaning again;
g. and finally, checking and accepting the cleaning condition according to the quality standard of checking and accepting.
2. The method for cleaning the pipelines before the production stop, inspection and maintenance of the high-sulfur-content station according to claim 1, wherein the whole equipment and the pipelines thereof are divided into the following cleaning units in the step a: a main acid gas pipeline cleaning unit, an emptying pipeline cleaning unit, a sewage discharge pipeline cleaning unit and a pressure container cleaning unit,
determining the medicament filling flow of each cleaning unit according to the divided cleaning units:
① main acid gas line purge unit:
the filling sequence of the agents is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence;
② purge line purge unit:
for the high-low pressure BDV and the bypass pipeline thereof, the sequence of filling the agents is a wellhead gas production tree, the high-low pressure BDV and the bypass emptying pipeline thereof and a torch liquid separating tank in turn;
for the emptying pipeline from the water separator to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separator acid gas inlet, a water separator safety valve bypass and the torch liquid separating tank in turn;
for the water jacket heating furnace to torch liquid separation tank emptying pipeline, the sequence of adding the medicament is a wellhead gas production tree, a water separation separator, a water jacket heating furnace safety valve bypass and a torch liquid separation tank in turn;
for the three-stage throttled safety valve and the bypass pipeline thereof, the sequence of the medicament filling is a wellhead gas production tree, a first-stage throttle valve, a water separation separator, a second-stage throttle valve, a water jacket heating furnace, a third-stage throttle valve, a safety valve bypass and a torch liquid separation tank in turn;
for the pipeline from the receiving and sending ball cylinder to the torch liquid separation tank, the sequence of adding the medicaments is a wellhead gas production tree, a water separation separator, a water jacket heating furnace, the receiving and sending ball cylinder, a safety valve bypass of the receiving and sending ball cylinder and the torch liquid separation tank in turn;
③ Sewage line washing Unit:
for the cleaning of the sewage disposal flow from the water separation separator to the torch liquid separation tank, the sequence of adding the medicament is a well mouth gas production tree, the sewage disposal flow of the water separation separator and the torch liquid separation tank in turn;
for cleaning the sewage disposal flow from the receiving and sending ball barrel to the torch liquid separating tank, the sequence of adding the medicament is a well mouth gas production tree, a water separating separator, a water jacket heating furnace, the receiving and sending ball barrel, the sewage disposal flow of the receiving and sending ball barrel and the torch liquid separating tank in sequence;
④ pressure vessel cleaning unit:
for the water separator, the sequence of filling the medicament is a sand washing port of the water separator and a downstream short section of an LV valve of an automatic blowdown pipeline in turn;
for the torch liquid separating tank, the sequence of adding the medicaments is a sand washing port of the torch liquid separating tank and a pollution discharge reserved port at the bottom of the torch liquid separating tank in turn;
for the production separator, the sequence of medicament filling is the production separator sand washing port, the production separator automatic blowdown pipeline LV valve low reaches nipple joint in the same way.
3. The method for cleaning the pipeline before the production halt inspection and maintenance of the high sulfur-containing station according to claim 1, wherein during the purging process of the cleaning unit in the step b, hydrogen sulfide detection points are respectively arranged at least at pressure relief ports of three pressure gauges, wherein the pressure relief ports of the three pressure gauges comprise a pressure relief port of a water separator, a pressure relief port behind a three-stage throttle valve of a water jacket heating furnace and a pressure relief port of a ball receiving and sending barrel; when the content of the hydrogen sulfide is detected at a hydrogen sulfide monitoring point, the frequency of the detected hydrogen sulfide is as follows: and detecting for multiple times within 5-10 minutes, and finishing fuel gas replacement when the detected hydrogen sulfide content is lower than 10 ppm.
4. The method for cleaning the pipeline before the production stop, the maintenance and the repair of the high-sulfur-content station according to claim 1, wherein the specific deodorization step in the step c is as follows:
① igniting the water jacket heating furnace, controlling the opening of the temperature control valve of the water jacket heating furnace to be 60-80%, and gradually increasing the water bath temperature of the water jacket heating furnace to 80 ℃;
②, injecting alkali liquor into each cleaning unit to ensure that the whole pipeline is filled with the alkali liquor and the temperature is kept at 80 ℃;
③ after the alkali liquor is injected, adjusting the opening of the temperature control valve of the water jacket heating furnace, starting the circulation of the alkali liquor, circulating the main acid gas pipeline cleaning unit, wherein the circulation path comprises a wellhead gas production tree, a water separation separator, the water jacket heating furnace, a receiving and sending ball barrel and a torch liquid separation tank in sequence, and then circulating the emptying pipeline cleaning unit and the sewage discharge pipeline cleaning unit to ensure that the temperature in the pipeline is kept at 60-70 ℃, and finishing deodorization.
5. The method for cleaning the pipeline before the shutdown, the inspection and the maintenance of the high-sulfur-content station according to claim 1, wherein: in the step d, cleaning the pipeline subjected to alkali liquor deodorization for 3-5 times by using a cleaning solution, and detecting the content of hydrogen sulfide in the solution removing process of each cleaning solution until the detected content of hydrogen sulfide is 0ppm, and finishing cleaning; in the liquid removing process of each cleaning liquid, the frequency of detecting hydrogen sulfide is as follows: the detection is carried out for a plurality of times within 5-10 minutes.
6. The method for cleaning the pipeline before the shutdown, the inspection and the maintenance of the high-sulfur-content station according to claim 1, wherein: step f, cleaning the coil pipe of the water jacket furnace by high-pressure water jet by using a high-pressure water jet device; and (3) carrying out manual cleaning and water jet cleaning on the TP plate, the sand washing manifold and the grid plate in containers such as a water separation device, a torch liquid separation tank and the like.
7. The method for cleaning the pipeline before the shutdown, the inspection and the maintenance of the high-sulfur-content station according to claim 1, wherein: the acceptance quality standard in the step g is as follows: the industrial equipment cleaning national standard GB/T25146-.
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Application publication date: 20200317 |