CN112539043B - Cleaning method and verification method for liquid inlet of piston of underground safety valve - Google Patents
Cleaning method and verification method for liquid inlet of piston of underground safety valve Download PDFInfo
- Publication number
- CN112539043B CN112539043B CN202011231391.XA CN202011231391A CN112539043B CN 112539043 B CN112539043 B CN 112539043B CN 202011231391 A CN202011231391 A CN 202011231391A CN 112539043 B CN112539043 B CN 112539043B
- Authority
- CN
- China
- Prior art keywords
- safety valve
- piston
- cleaning
- liquid inlet
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 125
- 238000004140 cleaning Methods 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012795 verification Methods 0.000 title claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 43
- 239000012535 impurity Substances 0.000 claims abstract description 36
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 239000012459 cleaning agent Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims 2
- 230000008859 change Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 14
- 239000010720 hydraulic oil Substances 0.000 description 11
- 230000000670 limiting effect Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 239000002904 solvent Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E21B47/00—Survey of boreholes or wells
Landscapes
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Geophysics (AREA)
- Fluid-Pressure Circuits (AREA)
- Safety Valves (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention discloses a method for cleaning a liquid inlet of a piston of an underground safety valve and a verification method, wherein the verification method adopts a system for cleaning the liquid inlet of the piston of the underground safety valve, and comprises the following steps: s1: whether the liquid inlet of the piston of the underground safety valve is blocked by impurities or not is verified, the underground safety valve is integrally pumped by the hydraulic pump through the hydraulic control pipeline, so that a negative pressure is provided for the liquid inlet of the piston of the safety valve, and the reset spring and the torsion spring are enabled to act. Meanwhile, whether the underground safety valve acts or not is judged by observing the change of the oil pressure of the wellhead, if the underground safety valve does not act after repeated pumping, other external reasons can be judged, if the underground safety valve acts after repeated pumping, impurity blockage can be judged, and if the underground safety valve blocks, the following steps are carried out; s2: and cleaning, namely filling chemical cleaning liquid to the liquid inlet of the piston, and discharging dissolved impurities out of the hydraulic control pipeline in a flowing manner along the opposite direction after the chemical cleaning liquid flows into the liquid inlet of the piston.
Description
The application is a divisional application provided by Chinese patent application with the application number of CN201810475891.4, the name of which is 'cleaning system and verification method for liquid inlet of piston of underground safety valve' filed on 17.5.2018.
Technical Field
The invention relates to the technical field of underground safety valves, in particular to a cleaning method and a verification method for a liquid inlet of a piston of an underground safety valve.
Background
The underground safety valve is an underground tool which is arranged in an oil gas well, can be closed emergently when production facilities have fire alarm, pipeline breakage and irresistible natural disasters (such as earthquake, ice condition, strong typhoon and the like) abnormal conditions, and can prevent well blowout and ensure safe production of the oil gas well.
At present, most of underground safety valves used in various gas fields at home are Baker, Wilford, Haributton, BJ and other foreign pure imported underground safety valves, and some manufacturers at home also produce the underground safety valves, but due to the difference in manufacturing process, the performance of the underground safety valves is obviously not as reliable as that of the foreign imported underground safety valves. A downhole safety valve must be installed on a gas well, particularly a sulfur-containing gas well, according to the industry standard, and the downhole safety valve has the main functions; firstly, shutdown is carried out under normal conditions (such as normal production shutdown, well site equipment overhaul and the like). And secondly, emergency closing is realized under abnormal conditions such as sudden fire, pipeline breakage or irresistible natural disasters in the production process, so that the safe production of the oil-gas well is ensured. And thirdly, for a high-sulfur-content gas well, the high-sulfur-content gas well is an important component for preventing natural gas leakage and is an important protective barrier for ensuring construction safety and life and property safety.
The underground safety valve is generally installed within a range of 90-110 meters away from a well head, the opening and closing state of a valve clack of the underground safety valve is controlled through a hydraulic pipeline of a well head safety control system, and the control pressure of the hydraulic pipeline is generally 8000-10000 Psi (different manufacturers, the set value of hydraulic control pressure is changed approximately). Although the manufacturers of the underground safety valves are different, the structural principles of the underground safety valves are different. The downhole safety valve is mainly structurally divided into a piston motion part, a power spring part, a self-balancing part and a valve clack opening and closing part. The working principle of the hydraulic oil pressure relief valve is that the opening and closing of the safety valve are controlled through the pressurization and the pressure relief of hydraulic oil. Namely: when a wellhead hydraulic control pipeline is pressurized, hydraulic oil enters the piston cavity to push the piston to move downwards, the spring is compressed, and the valve clack of the underground safety valve is opened. And (3) the ground hydraulic control pressure is discharged, the spring recovers deformation to enable the piston to move upwards, and the valve clack of the underground safety valve resets under the action of the torsion spring to close the safety valve.
In the production field of oil and gas fields, hydraulic pipelines used by the underground safety valve are all 1/4' hydraulic pipelines, and the inner diameter of the hydraulic pipelines is about 2 mm. And only one hydraulic pipeline enters the oil sleeve annulus to control the safety valve switch, and no oil return pipeline is designed. During long-term use, the base oil and additive components in the hydraulic oil are consumed or deteriorated with time due to the influence of gravity, pressure and temperature, namely, the hydraulic oil is aged; in the process of using the hydraulic oil, insoluble substances generated by pipeline abrasion and other reasons can be accumulated, and the phenomenon is also equivalent to generalized aging. The generated aging substances are continuously accumulated to the oil inlet of the piston of the safety valve under the action of gravity, so that the viscosity of hydraulic oil is changed, and the frictional resistance of the hydraulic oil is increased. Some 'ageing substances' can even directly block the oil inlet hole of the piston. Under the condition that other parameters are not changed, the viscosity of hydraulic oil is increased or the oil inlet hole of the piston is blocked, so that the resistance during the action of the piston is increased. When the resistance is larger than or equal to the elastic force of the spring for recovering deformation, even if the hydraulic control pressure is relieved by the wellhead safety control system, the pressure in the piston cannot be correspondingly released, and the spring cannot recover deformation, so that the underground safety valve cannot be normally closed. Therefore, the design of the underground safety valve without an oil return pipeline is a big defect, so that hydraulic oil in the pipeline cannot be cleaned and replaced regularly, the oil way is inevitably blocked in the long term, the pressure of a piston of the underground safety valve is suppressed, and a spring fails, so that the safety valve is closed abnormally. Such design deficiencies greatly compromise the service life of the downhole safety valve. It can be said that the failure of the downhole safety valve hydraulic system is only a time problem, which depends mainly on the temperature and pressure of the production well, the length of the safety valve switching interval period and the quality of the oil added into the hydraulic control pipeline.
In conclusion, after the safety valve in the prior art is used for a long time, impurities can be retained and accumulated at the liquid inlet of the piston, so that the liquid inlet of the piston is blocked, the oil pressure at the liquid inlet is increased, the piston cannot normally reset under the elastic action of the spring, and the valve clack cannot normally close. The service life of the underground safety valve is greatly shortened.
Disclosure of Invention
The invention aims to provide a method for cleaning a liquid inlet of a piston of an underground safety valve and a verification method, and the method has the advantages that: when the liquid inlet of the piston is blocked, the suction operation can be carried out above the ground to reduce the friction resistance of hydraulic oil at the liquid inlet of the piston and remove impurities at the oil inlet of the piston, so that the piston can automatically reset under the elastic action of the spring, the safety valve is normally closed, and the underground safety valve does not need to be taken out for replacement or maintenance. The safety valve is simple to operate, economical, practical, controllable in risk, safe and scientific, and can effectively prolong the service life of the safety valve.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a piston liquid inlet cleaning system of an underground safety valve comprises a safety valve body and a hydraulic control pipeline, wherein a piston liquid inlet is formed in the safety valve body, the hydraulic control pipeline is fixedly connected with the safety valve body and is communicated with a hydraulic cavity in the safety valve body through the piston liquid inlet, the piston liquid inlet cleaning system comprises a cleaning pipeline, the cleaning pipeline is inserted into the hydraulic control pipeline, one end of the cleaning pipeline extends to the position of the piston liquid inlet, and the other end of the cleaning pipeline is communicated with the ground; the cleaning device is characterized by also comprising a hydraulic filling pump, wherein one end of the cleaning pipeline, which is communicated with the ground, is connected with the hydraulic filling pump.
The invention is further configured to: the underground safety valve is integrally pumped by a hydraulic filling pump through a hydraulic control pipeline, whether the underground safety valve can be normally closed or not is observed, and if the underground safety valve is normally closed, it can be judged that impurities block a liquid inlet of the piston; if the power-off is still impossible, the external reason can be judged.
A method for cleaning a piston liquid inlet of an underground safety valve adopts the piston liquid inlet cleaning system of the underground safety valve, and comprises the following steps:
s1: verifying whether the liquid inlet of the piston of the underground safety valve is blocked by impurities or not,
the method comprises the following steps of integrally pumping the underground safety valve through a hydraulic control pipeline by adopting a hydraulic filling pump, observing whether the underground safety valve can be normally closed, judging other external reasons if the underground safety valve cannot be normally closed, judging impurity blockage if the underground safety valve is normally closed, and performing the following steps if the underground safety valve is impurity blockage;
s2: the cleaning is carried out, and the cleaning is carried out,
and injecting chemical cleaning liquid to the liquid inlet of the piston, and discharging dissolved impurities out of the hydraulic control pipeline in the opposite direction after the chemical cleaning liquid flows into the liquid inlet of the piston.
The invention is further configured to: and in the step S2, adding chemical cleaning liquid into the hydraulic control pipeline through the hydraulic filling pump, wherein the chemical cleaning liquid flows to the liquid inlet of the piston through the hydraulic control pipeline and then is reversely discharged through the cleaning pipeline.
The invention is further configured to: and in the step S2, chemical cleaning liquid is introduced into the cleaning pipeline through the hydraulic filling pump, flows to the liquid inlet of the piston through the cleaning pipeline and is reversely discharged through the hydraulic control pipeline.
The invention is further configured to: further comprising between the S1 and the S2 a step P: the dissolution is carried out, and the dissolution is carried out,
chemical cleaning agent, descaling agent, dissolving agent and other chemical solvents are injected into the liquid inlet of the piston through the cleaning pipeline to dissolve impurities.
The invention is further configured to: a step Q is further included between P and S2: the washing is carried out, and the washing is carried out,
chemical cleaning liquid is added into the liquid inlet of the piston through a cleaning pipeline or a hydraulic control pipeline, and the chemical cleaning liquid is repeatedly pumped and pressed to wash impurities at the liquid inlet of the piston.
The invention has the following advantages:
1. the method for verifying the abnormal closing of the underground safety valve is simple to operate and has intuitive result. And (4) pumping the whole safety valve by adopting a hydraulic filling pump through a hydraulic control pipeline so as to close the underground safety valve. The closing state of the safety valve can be confirmed by observing the oil pressure change of the production well;
2. chemical solvent can be filled above the ground through a cleaning pipeline to ensure that impurities accumulated at a piston liquid inlet are fully dissolved to form a substance with lower viscosity so as to be discharged back to the well mouth after the cleaning pipeline is flushed, thereby relieving the pressure holding condition of the piston in a hydraulic cavity and ensuring that a spring can reset the piston by means of the elastic action of self-recovery deformation;
3. chemical cleaning liquid is filled into the liquid inlet of the piston through a cleaning pipeline or a liquid control pipeline, the chemical cleaning liquid is repeatedly pumped and pressed to wash impurities at the position of the liquid inlet of the piston, part of impurities are scattered, and then chemical solvent is injected into the liquid inlet of the piston, so that the cleaning efficiency and the cleaning quality can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural view showing a closed state of a downhole safety valve in embodiment 1;
FIG. 2 is a schematic structural view showing the open state of the subsurface safety valve in embodiment 1;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a schematic diagram showing the steps of a method for cleaning a liquid inlet of a piston in an embodiment 3, wherein the method is implemented as a downhole safety valve.
Wherein: 1. a safety valve body; 11. an upper joint; 12. a lower joint; 13. an upper limiting plate; 14. a lower limiting plate; 15. a hydraulic chamber; 16. a piston liquid inlet;
2. a piston; 21. a baffle ring; 22. a thrust ramp;
3. a valve flap;
4. a torsion spring;
5. a return spring;
6. a hydraulic control pipeline;
7. and cleaning the pipeline.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The utility model provides a piston inlet cleaning system of subsurface safety valve, as shown in figure 1, the subsurface safety valve includes safety valve body 1 and piston 2, and 1 both ends of safety valve body are top connection 11 and lower clutch 12 respectively, and top connection 11 is used for being connected with last takeover (not drawn in the figure), and lower clutch 12 is used for being connected with lower takeover (not drawn in the figure), and safety valve body 1 is used for controlling the intercommunication between takeover and the lower takeover and closes.
The piston 2 is in a hollow tubular shape, the inner wall of the safety valve body 1 is rotatably connected with a valve clack 3, the valve clack 3 is fixedly connected with a rotating shaft (not marked in the figure) at a rotating center, the rotating shaft is provided with a torsion spring 4, one end of the torsion spring 4 is fixedly connected with the rotating shaft of the valve clack 3, the other end of the torsion spring is fixedly connected with the inner wall of the safety valve, the lower end surface of the piston 2 is positioned above the valve clack 3, and the valve clack 3 is in sealing butt joint with the lower port of the piston 2 in a closed state; the piston 2 slides downwards along the inner wall of the safety valve body 1 and then pushes the valve clack 3 to rotate around the rotating shaft of the valve clack 3, and the lower port of the piston 2 is gradually opened. Fixedly connected with keeps off ring 21 on the outer wall of piston 2, fixedly connected with is gone up limiting plate 13 and is gone up limiting plate 14 down on the 1 inner wall of relief valve body, keeps off ring 21 and is located between limiting plate 13 and the lower limiting plate 14 down, and piston 2 is along relief valve body 1 lapse back, keeps off ring 21 can with last limiting plate 13 looks butt in order to restrict piston 2 and continue to upwards slide. A return spring 5 is arranged between the baffle ring 21 and the lower limiting plate 14, two ends of the return spring 5 are respectively abutted against the baffle ring 21 and the lower limiting plate 14, the extension direction of the return spring 5 is the same as the sliding direction of the piston 2, and the return spring 5 is always kept in a compressed state.
A sealed hydraulic cavity 15 formed between the piston 2 and the upper limiting plate 13 is drilled on the wall of the safety valve body 1, a thrust inclined plane 22 is arranged on the outer wall of the piston 2, and the thrust inclined plane 22 is positioned in the hydraulic cavity 15; a piston liquid inlet 16 is formed in the inner wall of the hydraulic cavity 15, a hydraulic control pipeline 6 is fixedly connected to the outer wall of the safety valve body 1, one end of the hydraulic control pipeline 6 is communicated with the hydraulic cavity 15 through the piston liquid inlet 16, and the other end of the hydraulic control pipeline 6 is led to the ground and connected with a hydraulic filling pump (not shown in the figure); the thrust inclined plane 22 inclines towards the square part close to the central axis of the safety valve body 1 along the direction close to the liquid inlet 16 of the piston, and the hydraulic filling pump fills liquid or pumps liquid into the hydraulic cavity 15 through the hydraulic control pipeline 6 to change the hydraulic pressure in the hydraulic cavity 15; with reference to fig. 2, after the hydraulic pressure inside the hydraulic chamber 15 is increased, the piston 2 is pushed to slide downwards and compress the reset spring 5 through the thrust slope 22, so that the valve clack 3 is driven to open, the torsion spring 4 is gradually pushed to generate elastic deformation in the opening process of the valve clack 3, after the hydraulic pressure inside the hydraulic chamber 15 is reduced, the piston 2 slides upwards under the thrust action of the reset spring 5 to reset, and the torsion spring 4 gradually recovers the elastic deformation and pushes the valve clack 3 to rotate to reset to close the lower port of the piston 2.
As shown in fig. 3, the piston liquid inlet cleaning system includes a cleaning line 7, the cleaning line 7 is inserted into the hydraulic control line 6, one end of the cleaning line 7 extends to the piston liquid inlet 16, and the other end thereof is connected to the ground and connected to a separate hydraulic filling pump. When more impurities are accumulated in the piston liquid inlet 16 to cause the piston liquid inlet 16 to be blocked or the hydraulic pressure at the piston liquid inlet 16 is increased, liquid can be pumped to the piston liquid inlet 16 through the cleaning pipeline 7, and by combining the figure 2, the hydraulic pressure at the piston liquid inlet 16 can be reduced, so that the hydraulic pressure in the hydraulic cavity 15 is reduced, the piston 2 is convenient to reset, the valve clack 3 is normally closed, chemical cleaning liquid can be filled through the cleaning pipeline 7, and the chemical cleaning liquid flows to the piston liquid inlet 16 along the cleaning pipeline 7 and reversely discharges the impurities from the hydraulic control pipeline 6; chemical cleaning liquid can be introduced into the piston liquid inlet 16 through the hydraulic control pipeline 6, and impurities are reversely discharged from the cleaning pipeline 7 by the chemical cleaning liquid. Subsequent normal use of being convenient for, and need not take out change or maintenance with subsurface safety valve from the underground, convenient operation, and greatly prolonged subsurface safety valve's life.
Example 2
The verification method for judging whether the liquid inlet 16 of the piston of the underground safety valve is blocked by impurities comprises the steps of adopting a hydraulic filling pump to integrally suck the underground safety valve through a hydraulic control pipeline, observing whether the underground safety valve can be normally closed or not, and judging that the liquid inlet of the piston is blocked by the impurities if the underground safety valve is normally closed; if the power-off is still impossible, the external reason can be judged.
Example 3
A method for cleaning a liquid inlet of a piston of an underground safety valve comprises the following steps:
s1: verifying whether the liquid inlet 16 of the piston of the downhole safety valve is blocked by impurities,
adopting a hydraulic filling pump to perform integral suction on the underground safety valve through a hydraulic control pipeline 6, observing whether the underground safety valve can be normally closed, judging other external reasons if the underground safety valve cannot be normally closed, judging impurity blockage if the underground safety valve is normally closed, and performing the following steps if the underground safety valve is impurity blockage;
p: the mixture is dissolved and then is added with water,
chemical cleaning agents, descaling agents, dissolving agents and other chemical solvents are injected into the piston liquid inlet 16 through the cleaning pipeline 7 to dissolve impurities;
q: the washing is carried out, and the washing is carried out,
chemical cleaning liquid is added into the piston liquid inlet 16 through the cleaning pipeline 7 or the hydraulic control pipeline 6, and the chemical cleaning liquid is repeatedly pumped and pressed to wash impurities at the piston liquid inlet 16;
s2: the cleaning is carried out, and the cleaning is carried out,
and (3) filling chemical cleaning liquid into the piston liquid inlet 16, and discharging dissolved impurities out of the hydraulic control pipeline 6 in an opposite direction after the chemical cleaning liquid flows into the piston liquid inlet 16.
In S2, a chemical cleaning solution may be introduced into the hydraulic control line 6 by the hydraulic filling pump, and the chemical cleaning solution may flow to the piston inlet 16 through the hydraulic control line 6 and then be reversely discharged through the cleaning line 7.
In S2, a chemical cleaning solution may be introduced into the cleaning chamber by the hydraulic filling pump, and the chemical cleaning solution may be discharged in the reverse direction by the hydraulic control line 6 after flowing to the piston inlet 16 through the cleaning line 7.
Example 4
The utility model provides a piston inlet cleaning system of downhole safety valve, the difference with embodiment 1 lies in, downhole safety valve still includes back the liquid pipeline, returns liquid pipeline one end and stretches to piston inlet 16 department, and the other end stretches to above ground, will return the one end that the liquid pipeline lies in above ground and be connected with hydraulic pressure filling pump, can carry out suction cleaning operation to piston inlet 16 department.
The liquid return pipeline may be integrated inside the hydraulic control pipeline 6, and the channel of the hydraulic control pipeline 6 and the channel of the liquid return pipeline are arranged side by side. The liquid return pipeline can also be independently arranged outside the hydraulic control pipeline 6 and fixedly connected with the outer wall of the underground safety valve.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A method for cleaning a piston liquid inlet of an underground safety valve adopts a piston liquid inlet cleaning system of the underground safety valve, and is characterized in that the underground safety valve of the piston liquid inlet cleaning system of the underground safety valve comprises a safety valve body (1) and a hydraulic control pipeline (6), the safety valve body (1) is provided with a piston liquid inlet (16), the hydraulic control pipeline (6) is fixedly connected with the safety valve body (1) and is communicated with a hydraulic cavity (15) in the safety valve body (1) through the piston liquid inlet (16), the piston liquid inlet cleaning system comprises a cleaning pipeline (7), the cleaning pipeline (7) is inserted into the hydraulic control pipeline (6), one end of the cleaning pipeline (7) extends to the piston liquid inlet (16), and the other end of the cleaning pipeline is communicated with the ground; the cleaning device also comprises a hydraulic filling pump, wherein one end of the cleaning pipeline (7) which is communicated with the ground is connected with the hydraulic filling pump;
the method for cleaning the liquid inlet of the piston of the underground safety valve comprises the following steps:
s1: verifying whether a liquid inlet (16) of a piston of the underground safety valve is blocked by impurities or not,
the underground safety valve is integrally pumped by a hydraulic filling pump through a hydraulic control pipeline (6), whether the underground safety valve can be normally closed or not is observed, if the underground safety valve cannot be normally closed, other external reasons can be judged, if the underground safety valve is normally closed, impurity blockage can be judged, and if the underground safety valve is impurity blockage, the following steps are carried out;
s2: the cleaning is carried out on the mixture of the waste water and the waste water,
and chemical cleaning liquid is filled into the liquid inlet (16) of the piston, and after the chemical cleaning liquid flows into the liquid inlet (16) of the piston, dissolved impurities flow in the opposite direction and are discharged out of the hydraulic control pipeline (6).
2. The method for cleaning the liquid inlet of the piston of the downhole safety valve as claimed in claim 1, wherein the method comprises the following steps: in the step S2, a chemical cleaning solution is added into the hydraulic control line (6) through the hydraulic filling pump, and the chemical cleaning solution flows to the piston liquid inlet (16) through the hydraulic control line (6) and then is reversely discharged through the cleaning line (7).
3. The method for cleaning the liquid inlet of the piston of the downhole safety valve as claimed in claim 1, wherein the method comprises the following steps: and in the step S2, chemical cleaning liquid is introduced into the cleaning pipeline (7) through the hydraulic filling pump, flows to the piston liquid inlet (16) through the cleaning pipeline (7) and is reversely discharged through the hydraulic control pipeline (6).
4. The method for cleaning the liquid inlet of the piston of the subsurface safety valve according to claim 1, wherein a step P is further included between the step S1 and the step S2: the mixture is dissolved and then is added with water,
chemical cleaning agent, descaling agent and dissolving agent are injected into the piston liquid inlet (16) through the cleaning pipeline (7) to dissolve impurities.
5. The method for cleaning the liquid inlet of the piston of the subsurface safety valve as claimed in claim 4, wherein a step Q is further included between the P and the S2: the washing is carried out by the water-washing machine,
chemical cleaning liquid is added into the piston liquid inlet (16) through the cleaning pipeline (7) or the hydraulic control pipeline (6), and the chemical cleaning liquid is repeatedly pumped and pressed to wash impurities at the piston liquid inlet (16).
6. A verification method for abnormal closing of an underground safety valve adopts a piston liquid inlet cleaning system of the underground safety valve, and is characterized in that the underground safety valve of the piston liquid inlet cleaning system of the underground safety valve comprises a safety valve body (1) and a hydraulic control pipeline (6), the safety valve body (1) is provided with a piston liquid inlet (16), the hydraulic control pipeline (6) is fixedly connected with the safety valve body (1) and is communicated with a hydraulic cavity (15) in the safety valve body (1) through the piston liquid inlet (16), the piston liquid inlet cleaning system comprises a cleaning pipeline (7), the cleaning pipeline (7) is inserted into the hydraulic control pipeline (6), one end of the cleaning pipeline (7) extends to the piston liquid inlet (16), and the other end of the cleaning pipeline is communicated with the ground; the cleaning device is characterized by also comprising a hydraulic filling pump, wherein one end of the cleaning pipeline (7) which leads to the ground is connected with the hydraulic filling pump;
the method for verifying the abnormal closing of the underground safety valve comprises the following steps:
s1: verifying whether a piston liquid inlet (16) of the underground safety valve is blocked by impurities or not, integrally pumping the underground safety valve through a hydraulic control pipeline (6) by using a hydraulic filling pump, observing whether the underground safety valve can be normally closed or not, and judging that the piston liquid inlet is blocked by the impurities if the underground safety valve is normally closed; if the valve can not be closed, judging other external reasons, and if the valve is blocked by impurities, performing the following steps;
s2: the cleaning is carried out, and the cleaning is carried out,
and (3) filling chemical cleaning liquid into the liquid inlet (16) of the piston, and discharging dissolved impurities out of the hydraulic control pipeline (6) in a reverse direction after the chemical cleaning liquid flows into the liquid inlet (16) of the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011231391.XA CN112539043B (en) | 2018-05-17 | 2018-05-17 | Cleaning method and verification method for liquid inlet of piston of underground safety valve |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810475891.4A CN108643858B (en) | 2018-05-17 | 2018-05-17 | Cleaning system for liquid inlet of underground safety valve piston, verification method and cleaning method |
| CN202011231391.XA CN112539043B (en) | 2018-05-17 | 2018-05-17 | Cleaning method and verification method for liquid inlet of piston of underground safety valve |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810475891.4A Division CN108643858B (en) | 2018-05-17 | 2018-05-17 | Cleaning system for liquid inlet of underground safety valve piston, verification method and cleaning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112539043A CN112539043A (en) | 2021-03-23 |
| CN112539043B true CN112539043B (en) | 2022-08-19 |
Family
ID=63756769
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810475891.4A Active CN108643858B (en) | 2018-05-17 | 2018-05-17 | Cleaning system for liquid inlet of underground safety valve piston, verification method and cleaning method |
| CN202011231391.XA Active CN112539043B (en) | 2018-05-17 | 2018-05-17 | Cleaning method and verification method for liquid inlet of piston of underground safety valve |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810475891.4A Active CN108643858B (en) | 2018-05-17 | 2018-05-17 | Cleaning system for liquid inlet of underground safety valve piston, verification method and cleaning method |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN108643858B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO343070B1 (en) | 2017-04-24 | 2018-10-29 | Wellmend As | Wellbore hydraulic line in-situ rectification system and method |
| CN108643858B (en) * | 2018-05-17 | 2020-11-10 | 罗运川 | Cleaning system for liquid inlet of underground safety valve piston, verification method and cleaning method |
| NO345227B1 (en) * | 2018-10-22 | 2020-11-16 | Wellmend As | In-situ surface controlled sub-surface safety valves control line rectification device and method |
| MX2020006134A (en) | 2019-02-21 | 2020-09-25 | Abu Dhabi Nat Oil Co | Apparatus for clearing a plugged control line. |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434121A (en) * | 2011-12-14 | 2012-05-02 | 常州大学 | Underground low-frequency swabbing vibration unplugging device and application method thereof |
| EP2754852A1 (en) * | 2013-01-15 | 2014-07-16 | Services Pétroliers Schlumberger | Downhole pressure compensator |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU734599B2 (en) * | 1995-02-09 | 2001-06-21 | Baker Hughes Incorporated | Computer controlled downhole tools for production well control |
| US6283217B1 (en) * | 1998-08-06 | 2001-09-04 | Schlumberger Technology Corp. | Axial equalizing valve |
| GB2389596B (en) * | 2002-06-14 | 2005-05-18 | Abb Offshore Systems Ltd | Apparatus for surface control of a sub-surface safety valve |
| CA2743647C (en) * | 2010-06-17 | 2018-06-19 | Key Energy Services, Llc | Method and system for automatically setting, adjusting, and monitoring load-based limits on a well service rig |
| CN202402401U (en) * | 2011-12-22 | 2012-08-29 | 唐山开滦合力电器有限公司 | Emulsion filtering device with back flushing function |
| GB2520977B (en) * | 2013-12-05 | 2020-06-24 | Ge Oil & Gas Uk Ltd | Hydraulic flushing system |
| CN106285561B (en) * | 2015-05-15 | 2019-05-07 | 中国石油天然气股份有限公司 | Downhole safety valve system |
| CN204689589U (en) * | 2015-06-10 | 2015-10-07 | 蓬莱大金海洋重工有限公司 | The inner bay-lift of a kind of chain-type wind turbine tower |
| CN204691730U (en) * | 2015-06-25 | 2015-10-07 | 大庆市永晨石油科技有限公司 | Recoverable safety valve sent into by a kind of oil pipe |
| CN105350932B (en) * | 2015-11-03 | 2017-10-03 | 辽河石油勘探局 | A kind of gas well induced flow de-plugging fluid-discharge technology with pressure |
| CN205400676U (en) * | 2016-02-16 | 2016-07-27 | 山东大东联石油设备有限公司 | Ground hydraulic control's downhole safety valve |
| CN108643858B (en) * | 2018-05-17 | 2020-11-10 | 罗运川 | Cleaning system for liquid inlet of underground safety valve piston, verification method and cleaning method |
-
2018
- 2018-05-17 CN CN201810475891.4A patent/CN108643858B/en active Active
- 2018-05-17 CN CN202011231391.XA patent/CN112539043B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434121A (en) * | 2011-12-14 | 2012-05-02 | 常州大学 | Underground low-frequency swabbing vibration unplugging device and application method thereof |
| EP2754852A1 (en) * | 2013-01-15 | 2014-07-16 | Services Pétroliers Schlumberger | Downhole pressure compensator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108643858A (en) | 2018-10-12 |
| CN108643858B (en) | 2020-11-10 |
| CN112539043A (en) | 2021-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112539043B (en) | Cleaning method and verification method for liquid inlet of piston of underground safety valve | |
| CN105672943A (en) | Full-bore sliding sleeve with soluble structures | |
| CN101975042B (en) | Fully functional anti-spouting oil drain device | |
| CN104499993B (en) | Dual-flap-valve type downhole safety valve | |
| CN106401528A (en) | Grouting method for drilling rod | |
| CN204060585U (en) | Continuous circulation valve | |
| CN115749701B (en) | Blowout prevention pipe type oil pump | |
| CN108240198B (en) | Pump-passing well-flushing device for oil pump | |
| CN204283333U (en) | Well cementing impact pressure self-closing valve | |
| CN104019030B (en) | A kind of reacting cycle liquid drives the discharge device of oil pumping screw pump | |
| CN112554822B (en) | Environment-friendly continuous sand washing device and process without stopping pump | |
| CN211950364U (en) | Coal bed gas drainage and production pipe column | |
| CN203808915U (en) | Plugging device for oil pipe hanger | |
| CN115992660A (en) | Repeatedly opened and closed reverse circulation valve | |
| CN103573223B (en) | A kind of electric submersible pump automatically terminates the device of gas lock | |
| CN206554876U (en) | Oil well pump crosses pump well washing apparatus | |
| CN200971775Y (en) | Underground negative pressure deplug obtaining tool | |
| CN218844274U (en) | Open formula oil recovery sliding sleeve by force | |
| CN220929311U (en) | Continuous circulation nipple joint resistant to erosion | |
| RU2350784C1 (en) | Rod sub-surface pump with side aperture in cylinder plugged with hydraulic overflow valve | |
| CN109209295B (en) | Underground production and backwashing dual-function valve | |
| RU2783932C1 (en) | Method for processing the bottom-hole zone of the formation and a jet pump as part of a device for implementing the method | |
| CN210977396U (en) | Anti-return device for steam injection and oil production well | |
| CN219548840U (en) | Bypass valve capable of being opened and closed for multiple times | |
| CN211524777U (en) | Backflow prevention device and oil pumping pipe column backflow prevention device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |