CN210134922U - Gas well-containing gas well exhaust testing system for salt cavern gas storage - Google Patents
Gas well-containing gas well exhaust testing system for salt cavern gas storage Download PDFInfo
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- CN210134922U CN210134922U CN201920731991.9U CN201920731991U CN210134922U CN 210134922 U CN210134922 U CN 210134922U CN 201920731991 U CN201920731991 U CN 201920731991U CN 210134922 U CN210134922 U CN 210134922U
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Abstract
The utility model provides a gas well exhaust testing system of a salt cavern gas storage, which comprises a sleeve arranged in the gas well, a sleeve shoe arranged at the lower end of the sleeve, a brine tank, a central pipe and a closed tank which are sequentially communicated by pipelines; the central tube is coaxially arranged in the sleeve, and the lower end of the central tube extends out of the sleeve; the closed tank is a sealed tank and is communicated with an open tank through a pipeline; a thin pipeline is communicated in parallel with a communicating pipeline of the closed tank and the central pipe, and an exhaust control valve is arranged on the pipeline; the closed tank is also communicated with a U-shaped pipeline for gas discharge, and the other end of the U-shaped pipeline is an emptying processing end; the U-shaped pipeline is provided with a flowmeter. Salt cave gas storage contains gas well exhaust test system, can be used for judging whether salt cave gas storage contains the gas well and can carry out the mechanical integrity test.
Description
Technical Field
The utility model belongs to oil gas resource development field especially relates to a salt cavern gas storage contains gas well exhaust test system.
Background
The salt cavern gas storage has the disadvantages of complex process and long construction period, wherein the most complex process and the longest construction period are water-soluble cavities, and the basic principle of water-soluble cavity construction is to dissolve salt rocks by water and then discharge brine to form a salt cavity. Before water-soluble cavity construction, mechanical integrity test is needed to detect the tightness of the well, and only if the mechanical integrity test is qualified, the water-soluble cavity construction can be carried out.
Conventional salt cavern gas storage wells begin mechanical integrity testing after drilling is complete. The test procedure for mechanical integrity testing is as follows: and (3) taking nitrogen as a test medium, measuring data such as gas-water interface depths and the like in wells at different times through a logging tool to calculate the quality of the nitrogen in the wells at different times, and calculating the leakage rate in the wells according to the change of the quality of the nitrogen, thereby judging whether the mechanical integrity test of the gas storage is qualified. In gas wells, particularly gas wells with large formation gas quantity, the calculation of the nitrogen quality is influenced by the existence of the formation gas, and further the mechanical integrity test is influenced.
Disclosure of Invention
In view of this, the utility model aims at providing a salt cavern gas storage contains gas well exhaust test system to overcome prior art's defect, can be used for judging whether salt cavern gas storage contains the gas well and can carry out the mechanical integrity test.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a gas-containing well exhaust testing system of a salt cavern gas storage comprises a sleeve arranged in a gas-containing well, a sleeve shoe arranged at the lower end of the sleeve, a brine tank, a central pipe and a closed tank which are sequentially communicated through pipelines;
the central tube is coaxially arranged in the sleeve, and the lower end of the central tube extends out of the sleeve;
the closed tank is a sealed tank and is communicated with an open tank through a pipeline; a thin pipeline is communicated in parallel with a communicating pipeline of the closed tank and the central pipe, and an exhaust control valve is arranged on the pipeline; the closed tank is also communicated with a U-shaped pipeline for gas discharge, and the other end of the U-shaped pipeline is an emptying processing end; a flowmeter is arranged on the U-shaped pipeline; the central tube is coaxially arranged at the central position in the sleeve, and a distance is reserved between the central tube and the sleeve.
Further, the upper end of the brine tank is communicated with a first pipeline, and the first pipeline is communicated with a second pipeline; one end of the second pipeline is communicated with the water pump, and the other end of the second pipeline is communicated with the upper end of the central pipe; and the sections of the first pipeline and the second pipeline close to the water pump are provided with a brine control valve.
Further, the middle line pipe is communicated with the closed tank through a third pipeline, and the communication position of the third pipeline and the central pipe is positioned below the connecting pipeline of the brine tank and the central pipe; the third pipeline extends into the closed tank from one end communicated with the closed tank, and the tail end of the third pipeline is positioned above the liquid level in the closed tank.
Further, the closed tank is communicated with the open tank through a fourth pipeline, and the communication position of the closed tank and the open tank is positioned at the lower end of the closed tank; the closed tank is communicated with the U-shaped pipeline through a fifth pipeline, one end of the fifth pipeline, which is communicated with the closed tank, extends into the closed tank, and the tail end of the fifth pipeline is positioned above the liquid level in the closed tank.
Furthermore, the end face of the lower end of the sleeve is above an open hole section of the gas well.
Furthermore, the mode that the casing shoe is arranged at the lower end of the casing is in threaded connection; the central tube is fixed on the wellhead of the gas-containing well through a hanger, and the tube body at the lower end of the central tube extends into the sleeve.
Furthermore, a gap is reserved between the outer wall of the casing and the inner wall of the gas-containing well, and cement for fixing the casing and the gas-containing well is filled in the gap.
Furthermore, a guide pipe is sleeved on the outer wall of the upper end of the sleeve, and a sleeve shoe close to the stratum is installed at the lower end of the outer wall of the guide pipe; the guide pipe is fixedly connected with the inner surface of the upper end of the gas-containing well through well cementation cement.
Another object of the utility model is to provide a salt cavern gas storage contains gas well exhaust testing method to whether the convenient detection salt cavern gas storage of applied above-mentioned test system contains the gas well and can carry out mechanical integrity test.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
a method for testing gas exhaust of a gas well of a salt cavern gas storage is used for judging whether the gas well of the salt cavern gas storage can be subjected to mechanical integrity test or not by detecting the discharge capacity of formation gas in different pressure states.
Preferably, the standard for judging whether the gas-containing well of the salt cavern gas storage can be subjected to mechanical integrity test by detecting the discharge capacity of the formation gas in different pressure states is as follows: and if the discharge amount of the formation gas under the test pressure is less than or equal to the nitrogen amount of 25kg/day, the gas containing well of the salt cavern gas storage can be subjected to mechanical integrity test, and if the discharge amount of the formation gas under the test pressure is greater than the nitrogen amount of 25kg/day, the gas containing well of the salt cavern gas storage can not be subjected to mechanical integrity test.
Preferably, the method for testing the displacement of the formation gas under different pressure states comprises the following steps:
s01: dividing the exhaust test into five stages of a first atmospheric pressure state, a natural pressure increasing state, a test pressure state, a pressure reducing state and a second atmospheric pressure state, and defining the maximum allowable operation pressure of a wellhead during the exhaust test as follows:
P1test＝Ptest-ρgh/105
in the formula:
P1testfor the maximum allowable operating pressure at the wellhead in bar, PtestThe test pressure at the position of the casing shoe is shown in units of bar and rho, the density of brine in the well is shown in units of kg/m3G is the acceleration of gravity in m/s2H is the shoe depth in m;
s02: in the first atmospheric pressure stage, the duration is 8-12 days, the pressure and the gas flow of a wellhead are recorded to obtain the gas discharge capacity in an atmospheric pressure state, and two gas samples are taken in the period to analyze to obtain gas components;
s03: a natural pressure boosting stage, wherein the air exhaust is stopped, the pressure is naturally boosted until the pressure is stable, or the pressure of a wellhead reaches the maximum allowable operation pressure, and the pressure corresponds to the test pressure at the position of the casing shoe;
s04: in the pressure testing stage, the casing shoe is kept in a pressure testing state for 4-9 days, the discharge capacity of stratum gas under the testing pressure is measured, and whether the gas-containing well of the salt cavern gas storage can be subjected to mechanical integrity testing is judged;
s05: in the pressure reduction stage, gas in the well is discharged until the pressure of the well head is atmospheric pressure, and the pressure reduction rate cannot exceed 10bar/h according to actual experience;
s06: and in the second atmospheric pressure stage, the duration is about 8-12 days, the pressure and the gas flow of the well mouth are recorded to obtain the gas discharge capacity in an atmospheric pressure state, and two gas samples are taken during the period to analyze the gas composition again.
Preferably, the test pressure at the shoe is intended to be 200 bar; in step S04, the method for maintaining the casing shoe in the test pressure state includes: if the pressure drops, brine needs to be kept at the test pressure state through the central pipe, and if the pressure rises, brine needs to be kept at the test pressure state through the central pipe.
Preferably, in step S01, the gas composition decides the maximum allowable volume of formation gas discharge capacity and the formation gas treatment emptying mode, and according to practical experience, when the formation gas discharge capacity is less than 25kg/day of test gas nitrogen amount, the mechanical integrity test can be performed, the utility model discloses the maximum allowable volume of formation gas in the gas-containing well of salt cavern gas storage, the computational formula is as follows:
in the formula:
m1maxis the maximum allowable amount of formation gas in kg/day rho1The formation gas density under pressure is measured at the shoe location of the casing in kg/m3，ρ2For the test of the nitrogen density of the gas at the test pressure at the shoe, the unit kg/m3, m2maxThe maximum allowable mass error for the test gas nitrogen was 25 kg/day.
Preferably, the formation gas in the gas-containing well of the salt cavern gas storage is carbon dioxide; in step S05, if the gas amount is small or unstable during pressure reduction so that the flowmeter cannot achieve stable metering, the gas should be periodically vented to accurately detect the total exhaust gas amount, thereby determining the average flow rate.
The salt cavern gas storage contains the exhaust test method of gas well can judge whether contain the gas well and can carry out the mechanical integrity test, its principle is simple as follows: the key of the mechanical integrity test is that whether the sleeve shoe meets the sealing requirement under the test pressure or not is tested, the influence of the formation gas cannot exceed the nitrogen amount of 25kg/day in the test process, the exhaust test is to detect the exhaust amount of the formation gas under the test pressure of the sleeve shoe, if the exhaust amount of the formation gas is less than the nitrogen amount of 25kg/day, the gas-containing well of the salt cavern gas storage can be subjected to the mechanical integrity test, and if the exhaust amount of the formation gas is more than the nitrogen amount of 25kg/day, the gas-containing well of the salt cavern gas storage cannot be subjected to the mechanical integrity test.
Compared with the prior art, a salt cavern gas storage contain gas well exhaust test system have following advantage:
the gas well exhaust testing system for the salt cavern gas storage is suitable for judging whether the gas well of the salt cavern gas storage can be subjected to mechanical integrity testing or not, and provides technical support for water-soluble cavity construction of the gas well of the salt cavern gas storage; flexible application, convenient operation, low requirement on technical personnel and contribution to popularization and use in engineering projects. The closed tank is used for containing and metering brine brought out by gas, and plays a role in buffering gas, so that the flowmeter can measure stably; the open tank is communicated with the atmosphere, so that the gas in the closed tank is ensured to be in an atmospheric pressure state, and the discharge capacity of the formation gas under the atmospheric pressure can be accurately measured; the flow meter can be used to meter the amount of gas, and if the amount of gas is small or unstable such that the flow meter cannot achieve stable metering, the gas should be periodically vented in order to accurately detect the total amount of exhaust gas and thereby determine the average flow rate.
Compared with the prior art, the method for testing the gas-containing well exhaust of the salt cavern gas storage has the same advantages as the system for testing the gas-containing well exhaust of the salt cavern gas storage, and the method is not repeated herein.
Drawings
FIG. 1 is a schematic diagram of the simple structure of the gas discharge test system for gas wells in the salt cavern gas storage of the present invention;
FIG. 2 is a schematic diagram of the wellbore of the gas-containing well of FIG. 1;
FIG. 3 is a schematic flow chart of the method for testing the gas discharge of the gas-containing well in the salt cavern gas storage of the present invention;
FIG. 4 is a schematic diagram of a prior art mechanical integrity test;
fig. 5 is a schematic view of the exhaust test of the present invention.
Reference numerals:
1-brine tank; 2-a central tube; 3-closing the tank; 4-gas-containing wells; 5-an open hole section; 6-a shoe; 7-open can; 8-a thin line; 9-an exhaust control valve; a 10-U-shaped conduit; 11-emptying treatment end; 12-a flow meter; 13-a first line; 14-a second line; 15-a water pump; a 16-brine control valve; 17-a third line; 18-a fourth line; 19-a fifth line; 20-gas; 21-brine; 22-a sleeve; 23-formation; 24-well cement; 25-a catheter; 26-casing shoe near the formation.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following embodiments and accompanying drawings.
As shown in fig. 1 and 2, the gas-containing well exhaust gas testing system for the salt cavern gas storage comprises a casing 22 arranged in a gas-containing well 4, a casing shoe 6 arranged at the lower end of the casing 22, and a brine tank 1, a central pipe 2 and a closed tank 3 which are sequentially communicated through pipelines; the central tube 2 is coaxially arranged at the central position in the sleeve 22, a space is reserved between the central tube 2 and the sleeve 22, and in addition, the lower end of the central tube 2 extends out of the sleeve 22; the closed tank 3 is a sealed tank and is communicated with an open tank 7 through a pipeline; a thin pipeline 8 is communicated in parallel with the communication pipeline of the closed tank 3 and the central pipe 2, and a gas exhaust control valve 9 is arranged on the pipeline; the closed tank 3 is also communicated with a U-shaped pipeline 10 for gas discharge, and the other end of the U-shaped pipeline 10 is an emptying processing end 11; a flowmeter 12 is mounted on the U-shaped pipe 10. The diameter of the thin line is 1/4-1 inch, preferably 1/4 inches, and as small as 1 inch as possible, too large of a line can cause gas at high pressure to break the closed tank and flow meter. A gap is left between the outer wall of the casing 22 and the inner wall of the gas-containing well, and the casing 22 is fixedly mounted in the gas-containing well 4 by injecting cement into the gap. The installation position of the casing 22 is above an open hole section 5 of the gas-containing well (namely, the open hole is a part of the gas-containing well 4, and the open hole section to which the casing at the lower end of the gas-containing well does not extend is called the open hole), and the mode that the casing shoe 6 is installed at the lower end of the casing 22 can be threaded connection; the central tube 2 may be mounted in the casing in such a way that it is fixed to the wellhead of the gas-containing well by means of a hanger, while keeping the tube body extending into the casing.
The arrangement of the exhaust control valve 9 can be used for controlling the discharge rate of gas and the like, the type of the exhaust control valve 9 is not limited, and valves which mainly control the gas flow and have opening and closing functions in the prior market can be used; the flow meter 12, can be used to meter the amount of exhaust gas during the test, and if the amount of gas is small or unstable such that the flow meter cannot achieve stable metering, the gas should be periodically vented to accurately detect the total amount of exhaust gas and thereby determine the average flow rate. The emptying treatment end 11 is mainly used for treating and emptying gas if the salt cavern gas storage contains gas well formation gasLike the utility model provides a carbon dioxide, can take direct unloading. If the gas is toxic and harmful gas, the gas is exhausted after being treated according to the requirement of an HSE management system. The artificial pollution-free inert gas nitrogen that adopts is as the test medium among the mechanical integrity test, the utility model discloses well carbon dioxide is produced in the stratum, is not artificial adoption. According to the consultation confirmation, the CO in the factory is currently2All are directly discharged into the air without relevant treatment, and the relevant treatment mainly aims at toxic and harmful substances such as nitrogen, sulfur and the like.
The closed tank is used for containing and metering brine brought out by gas, and simultaneously plays a role in buffering the gas, so that the flowmeter can measure stably; the open tank is communicated with the atmosphere, so that the gas in the closed tank is ensured to be in an atmospheric pressure state, and the discharge capacity of the formation gas under the atmospheric pressure can be accurately measured; the flow meter can be used to meter the amount of gas, and if the amount of gas is small or unstable such that the flow meter cannot achieve stable metering, the gas should be periodically vented in order to accurately detect the total amount of exhaust gas and thereby determine the average flow rate.
As an optional embodiment, the upper end of the brine tank 1 is communicated with a first pipeline 13, and the first pipeline 13 is communicated with a second pipeline 14; one end of the second pipeline 14 is communicated with the water pump 15, and the other end is communicated with the upper end of the central pipe 2; a brine control valve 16 is mounted on each of the first pipe line 13 and the second pipe line 14 near the water pump 15. The type of the brine control valve 16 is not limited, and any valve mainly functioning to control the flow rate of liquid and to open and close is available on the market. The first and second lines 13 and 14 with the brine control valve 16 are provided for the purpose of: in order to reduce the influence of pressure change on the casing shoe as much as possible, the pressure change rate cannot exceed 10bar/h in the pressure boosting and reducing processes according to practical experience, and as the well space is small and the brine compression performance is small, the brine injection pressure boosting is easy to exceed 10bar/h, and the water pump is easy to be suppressed, pipelines with brine control valves, namely a first pipeline 13 and a second pipeline 14, for returning to the brine tank need to be installed at the brine inlet, and the two pipelines can play roles of backflow partial pressure, control of the pressure boosting rate in the well, protection of the water pump and simultaneously can be used for discharging brine.
As an alternative embodiment, the central tube 2 communicates with the closed tank 3 through a third line 17, the communication of the third line 17 with the central tube 2 being located below the line connecting the brine tank 1 with the central tube 2; the third pipeline 17 extends into the closed tank 3 from one end of the closed tank 3, and the tail end of the third pipeline is positioned above the liquid level in the closed tank 3.
As an alternative embodiment, the closed tank 3 communicates with the open tank 7 through a fourth line 18, the communication being at the lower end of the closed tank 3; the closed tank 3 is communicated with the U-shaped pipeline 10 through a fifth pipeline 19, one end of the fifth pipeline 19, which is communicated with the closed tank 3, extends into the closed tank 3, and the tail end of the fifth pipeline is positioned above the liquid level in the closed tank 3. The closed tank 3 may be a closed stainless steel casing in which the liquid is brine, part of which is discharged by creep in the well and part of which is carried away by gas. No valve or a valve is arranged on the pipeline between the closed tank 3 and the open tank 7, but the valve is in an open state in operation, and the liquid in the closed tank 3 and the open tank 7 can freely circulate to keep the pressure balance. The open tank 7 and the brine tank 1 can be both open stainless steel tanks.
It should be noted that the gas well-containing well body structure in the gas well-containing gas storage system of the salt cavern gas storage of the present invention is shown in fig. 2. Like most of the existing wells, the gas-containing well 4 is arranged below the surface of the stratum 23, the casing 22 extends into the gas-containing well 4, a gap is reserved between the outer wall of the casing 22 and the inner wall of the gas-containing well 4, the casing 22 and the gas-containing well 4 can be fixed together by filling cement in the gap, meanwhile, a guide pipe 25 is sleeved on the periphery of the upper end of the casing 22, a casing shoe 26 close to the stratum is sleeved on the lower end of the outer surface of the guide pipe 25, and the periphery of the guide pipe 25 is fixed on the inner surface of the upper end of the gas-containing well. Specifically, two sections of holes are downwards opened in the stratum 1, the diameter of the first section of hole is larger than that of the second section of hole, the first section of hole is communicated with the second section of hole, and the first section of hole and the second section of hole jointly form a gas-containing well 4; the sleeve sequentially penetrates through the first section of hole and the second section of hole from the stratum, then the guide pipe is sleeved outside the sleeve, and cement is filled between the guide pipe and the inner wall of the second section of hole. And cement is filled between the inner wall of the second section of hole and the outer wall of the sleeve.
As shown in fig. 3, the method for performing the gas discharge test by using the gas discharge test system for the gas-containing well of the salt cavern gas reservoir as described above determines whether the gas-containing well 4 of the salt cavern gas reservoir can perform the mechanical integrity test by detecting the discharge capacity of the formation gas in different pressure states.
Specifically, the standard for judging whether the gas-containing well 4 of the salt cavern gas storage can be subjected to mechanical integrity test by detecting the discharge capacity of the formation gas in different pressure states is as follows: if the discharge amount of the formation gas under the test pressure is less than or equal to the nitrogen amount of 25kg/day, the salt cavern gas containing well 4 may be subjected to the mechanical integrity test, and if the discharge amount of the formation gas under the test pressure is greater than the nitrogen amount of 25kg/day, the salt cavern gas containing well 4 may not be subjected to the mechanical integrity test.
More specifically, the method for testing the displacement of the formation gas under different pressure states comprises the following steps:
s01: the purpose of the gas discharge test is to judge whether the gas-containing well of the salt cavern gas storage can be subjected to a mechanical integrity test, the main difference between the two is that the test medium of the gas discharge test is brine, the test medium of the mechanical integrity test is nitrogen, and the process of the mechanical integrity test is consistent with that of the mechanical integrity test, so that the gas discharge test is divided into five stages (as shown in fig. 4 and 5) of a first atmospheric pressure state, a natural pressure increasing state, a test pressure state, a pressure reducing state and a second atmospheric pressure state, and the maximum allowable operation pressure of the wellhead during the gas discharge test is defined as:
P1test＝Ptest-ρgh/105
in the formula:
P1testfor the maximum allowable operating pressure at the wellhead in bar, PtestThe test pressure at the position of the casing shoe 6 is shown in bar, rho is the brine density in the well and kg/m3G is the acceleration of gravity in m/s2H is the depth of the shoe 6 in m;
s02: the first atmospheric phase, logging the wellhead pressure and the gas flow for 8-12 days, preferably 10 days, obtains the gas displacement under atmospheric pressure, and during this period, two gas samples are taken and analyzed to obtain the gas composition. The gas composition decides the maximum allowable volume of formation gas discharge capacity and the empty mode of formation gas processing, and according to actual experience, when formation gas discharge capacity is less than test gas nitrogen gas volume 25kg/day, can carry out the mechanical integrity test, the utility model discloses salt cavern gas storage contains the maximum allowable volume of formation gas in the gas well 4, the computational formula is as follows:
in the formula:
m1maxis the maximum allowable amount of formation gas in kg/day rho1The formation gas density in kg/m at the test pressure at the shoe 6 is measured3，ρ2For the test of the nitrogen density of the gas at the test pressure at the shoe 6, the unit kg/m3, m2maxThe maximum allowable mass error for the test gas nitrogen was 25 kg/day.
Taking the example that the stratum gas in the gas-containing well of the salt cavern gas storage is carbon dioxide, the density of the carbon dioxide at the position of a casing shoe in the stratum under the test pressure is 4 times of that of the nitrogen, and the maximum allowable value of the discharge amount of the carbon dioxide in the stratum gas is 100 kg/day.
S03: a natural pressure increase stage, in which the exhaust is stopped, the pressure is naturally increased until the pressure is stable, or the pressure at the wellhead reaches the maximum allowable operating pressure, corresponding to the test pressure at the casing shoe 6;
s04: the test pressure phase, i.e. 200bar at the shoe, maintains the shoe at the test pressure for 4-9 days, preferably 7 days. On one hand, measuring the formation gas discharge capacity under the test pressure, and determining whether a mechanical integrity test can be carried out; on the other hand, under the condition that it is determined that the mechanical integrity test can be performed, it is decided how to perform the test: if the formation gas continuously flows into the well under the test pressure to cause the pressure to rise fast, continuously discharging halogen during the test period to keep the test pressure state; formation gas may originate from a formation fracture and if the pressure drops as test gas flows into the formation fracture at the test pressure, brine needs to be injected continuously to maintain the test pressure during the test. Specifically, it is: if the pressure drops, brine needs to be kept at the test pressure state through the central pipe, and if the pressure rises, brine needs to be kept at the test pressure state through the central pipe. This is because brine injection or drainage is required to maintain the pressure at the test pressure because the formation is gas, meaning there may be fractures in the formation, which may not be maintained at the test pressure during the test. In addition, when the gas amount in the pressure stage is large, a thin pipeline is selected; a coarse line (i.e. the third line 17) is used in the atmospheric stage or when the gas quantity is small at the test pressure. It should be noted that 200bar is only for the turkish project of the present invention, and different well testing pressures are different and need to be determined according to specific situations.
S05: and a pressure reduction stage, namely exhausting gas in the well until the pressure of the well head is atmospheric pressure, and periodically exhausting the gas if the gas amount is small or unstable so that the flowmeter cannot realize stable metering during exhausting (specifically, the gas is exhausted periodically if the gas amount is small enough for metering by the flowmeter, and the gas is exhausted periodically if the gas amount is not small enough for metering by the flowmeter. The depressurization rate cannot exceed 10bar/h according to practical experience.
S06: and recording the pressure and the gas flow of the well head in the second atmospheric pressure stage for 8-12 days, preferably 10 days, obtaining the gas discharge capacity in an atmospheric pressure state, taking two gas samples in the second atmospheric pressure stage, and analyzing the gas components again.
According to the method, whether the gas well of the salt cavern gas storage can be tested in mechanical integrity and how to test the gas well of the salt cavern gas storage can be judged by utilizing the gas exhaust test system of the gas well of the salt cavern gas storage for testing.
This is further illustrated by an application example.
Taking the gas discharge test of a gas well containing a salt cavern gas storage of the Turkish as an example, the gas discharge test system of the gas well containing the salt cavern gas storage as shown in figures 1 and 2 is adopted. And (3) testing the exhaust of a gas well containing a Turkish salt cavern gas storage: the pressure of the test is 200bar, and the brine density in the well is determined1200kg/m3The shoe depth is 1120m, the wellhead maximum pressure is 200 bar-g-1120 bar brine density (g is gravity acceleration in m/s) 68bar2). The gas component analysis of two atmospheric pressure stages shows that the formation gas is carbon dioxide, and the density of the carbon dioxide under the test pressure at the position of a casing shoe in the formation is 4 times of that of the nitrogen (the density of the nitrogen is 196kg/m at 200bar and the temperature in the well is about 45℃)3；CO2The density is 786kg/m3) The maximum allowable amount of the formation gas discharge under the test pressure is 100 kg/day, the formation gas can be directly discharged without being treated, and the gas flow of the two atmospheric pressure stages is 15-20m3The formation gas flow rate under the atmospheric pressure state is known to a certain extent; in the natural pressure increasing stage, the wellhead pressure is increased to about 53bar to reach a stable state, and the wellhead pressure is corresponding to about 185bar of the casing shoe at the moment and cannot reach 200bar of test pressure (the maximum wellhead pressure corresponding to 200bar is 68 bar.); in the pressure testing stage, brine is continuously injected through the central pipe to be kept in the pressure testing state, and the discharge amount of carbon dioxide in formation gas is stabilized at 45-50 kg/day and is less than 100 kg/day of the maximum allowable amount. It should be noted that the purpose of testing the gas flow rate in the atmospheric pressure phase is: the rough condition of the gas flow in the well is known, and certain guidance is provided for subsequent operation, such as guidance for selecting a venting mode and the like. In this project, the duration of the first atmospheric phase and the second atmospheric phase is 10 days, and the time for the test pressure phase to keep the casing shoe in the test pressure state is 7 days.
The gas exhaust test result shows that the gas-containing well of the salt cavern gas storage can be subjected to mechanical integrity test, and brine needs to be continuously injected to keep a test pressure state during the mechanical integrity test. The method and the system for testing the gas discharge of the gas-containing well of the salt cavern gas storage are successfully applied to a certain gas-containing well of the salt cavern gas storage of Turkey.
It is further shown through the above examples and drawings that the utility model discloses a salt cave gas storage contains exhaust test method and system of gas well can be accurate convenient judge whether salt cave gas storage contains the gas well and can carry out mechanical integrity test and how to test, can provide technical support for the construction that salt cave gas storage contains the gas well.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a salt cavern gas storage contains gas well exhaust test system, includes installs sleeve pipe (22) in containing gas well (4), installs casing shoe (6) at sleeve pipe (22) lower extreme, its characterized in that: the brine pot also comprises a brine pot (1), a central pipe (2) and a closed pot (3) which are communicated in sequence by pipelines;
the central tube (2) is coaxially arranged in the sleeve (22), and the lower end of the central tube extends out of the sleeve (22);
the closed tank (3) is a sealed tank and is communicated with an open tank (7) through a pipeline; a thin pipeline (8) is communicated in parallel with a communicating pipeline of the closed tank (3) and the central pipe (2), and a gas exhaust control valve (9) is arranged on the thin pipeline; the closed tank (3) is also communicated with a U-shaped pipeline (10) for gas discharge, and the other end of the U-shaped pipeline (10) is an emptying processing end (11); a flowmeter (12) is arranged on the U-shaped pipeline (10).
2. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: the upper end of the brine tank (1) is communicated with a first pipeline (13), and the first pipeline (13) is communicated with a second pipeline (14); one end of the second pipeline (14) is communicated with the water pump (15), and the other end is communicated with the upper end of the central pipe (2).
3. The salt cavern gas storage gas-containing well exhaust testing system of claim 2, wherein: the sections of the first pipeline (13) and the second pipeline (14) close to the water pump (15) are provided with a brine control valve (16).
4. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: the central tube (2) is coaxially arranged at the central position in the sleeve (22) with a distance between the two.
5. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: the central tube (2) is communicated with the closed tank (3) through a third pipeline (17), and the communication position of the third pipeline (17) and the central tube (2) is positioned below the connecting pipeline of the brine tank (1) and the central tube (2); the third pipeline (17) is communicated with one end of the closed tank (3) and extends into the closed tank (3), and the tail end of the third pipeline is positioned above the liquid level in the closed tank (3).
6. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: the closed tank (3) is communicated with the open tank (7) through a fourth pipeline (18), and the communication position of the closed tank (3) is positioned at the lower end of the closed tank (3); the closed tank (3) is communicated with the U-shaped pipeline (10) through a fifth pipeline (19), one end of the fifth pipeline (19), which is communicated with the closed tank (3), extends into the closed tank (3), and the tail end of the fifth pipeline is positioned above the liquid level in the closed tank (3).
7. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: the end surface of the lower end of the sleeve (22) is above an open hole section (5) of the gas well (4).
8. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: the mode that the casing shoe (6) is arranged at the lower end of the casing (22) is in threaded connection; the central pipe (2) is fixed at the wellhead of the gas well (4) through a hanger, and the pipe body at the lower end of the central pipe extends into the casing (22).
9. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: a gap is reserved between the outer wall of the casing (22) and the inner wall of the gas-containing well (4), and cement for fixing the casing (22) and the gas-containing well (4) is filled in the gap.
10. The salt cavern gas storage gas-containing well exhaust testing system of claim 1, wherein: a guide pipe (25) is sleeved on the outer wall of the upper end of the sleeve (22), and a sleeve shoe (26) close to the stratum is installed at the lower end of the outer wall of the guide pipe (25); the conduit (25) is fixedly connected with the inner surface of the upper end of the gas-containing well through well cementing cement (24).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110005409A (en) * | 2019-05-21 | 2019-07-12 | 中国天辰工程有限公司 | A kind of salt hole air reserved storeroom venting test containing gas well method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110005409A (en) * | 2019-05-21 | 2019-07-12 | 中国天辰工程有限公司 | A kind of salt hole air reserved storeroom venting test containing gas well method and system |
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