CN212250012U - High-temperature high-pressure self-blowing geothermal well killing device - Google Patents
High-temperature high-pressure self-blowing geothermal well killing device Download PDFInfo
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- CN212250012U CN212250012U CN202021825337.3U CN202021825337U CN212250012U CN 212250012 U CN212250012 U CN 212250012U CN 202021825337 U CN202021825337 U CN 202021825337U CN 212250012 U CN212250012 U CN 212250012U
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Abstract
The utility model discloses a high temperature high pressure self-blowing geothermal well killing device guarantees the safety of constructor and equipment. The high-temperature high-pressure self-blowing geothermal well killing device comprises a well mouth flange, an elevator, an oil pipe, a check valve, an annular air bag and an air pipe; the elevator and the wellhead flange are sequentially sleeved on the upper part of the oil pipe from top to bottom in an empty mode, and the elevator and the wellhead flange are fixed relatively; the annular air bag is sleeved below a wellhead flange of the oil pipe in an empty manner, is relatively fixed with the wellhead flange and is used for submerging in a geothermal well along with the elevator and the wellhead flange; the air pipe extends into the air bag through the geothermal well casing pipe, the part of the air pipe, which is positioned in the geothermal well casing pipe, is parallel to the oil pipe, and the part of the air pipe, which is positioned outside the geothermal well casing pipe, is provided with a pressure detection unit and an air valve. The utility model also realizes temporary plugging and plugging at any time, and ensures the safety of constructors and equipment; in addition, a drainage pipe and a drainage valve are arranged on the radial outer side of the oil pipe, and overflowing well water can be discharged.
Description
Technical Field
The application relates to a geothermal well killing device.
Background
Terrestrial heat is a novel clean resource and energy source, integrates heat collection, mine and water, and has wide application in the fields of bath, medical care, heating, power generation, planting and breeding, mineral water drinking and the like.
The geothermal well, generally speaking, refers to a method and a device for generating electricity by using geothermal energy about 3500 meters deep or hot spring water with the water temperature higher than 30 ℃, and the geothermal energy is divided into three types of high temperature, medium temperature and low temperature. The temperature is higher than 150 ℃, exists in a steam form, and belongs to high-temperature geothermal energy; 90-150 ℃, exists in the form of a mixture of water and steam, and belongs to medium-temperature geothermal energy; higher than 25 ℃ and lower than 90 ℃, and exists in the forms of warm water, warm hot water, hot water and the like, and belongs to low-temperature geothermal energy.
Kill, a process in which the pressure of the drilling fluid column is reestablished in the well to balance the formation pressure after flooding has occurred, in order to prevent blowout.
Geothermal wells differ from oil and gas wells in that the drilling fluid must be circulated to prevent vaporization, and kill-job techniques also differ from control techniques for oil wells. If the blowout occurs in a shallow water layer, the difficulty of solving is greater.
For the high-temperature and high-pressure geothermal well, the safe and efficient kill-job is particularly emphasized, so that the pump-tripping operation is normally carried out in the production operation, and the normal production heating in the heating season process is further not influenced, so that the efficient operation is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high temperature high pressure self-blowing geothermal well killing device guarantees the safety of constructor and equipment.
In order to achieve the above object, the present invention provides the following solutions:
a high-temperature high-pressure self-blowing geothermal well killing device comprises a well head flange, an elevator, an oil pipe and a check valve, wherein the oil pipe and a geothermal well casing are coaxially arranged, and the check valve is installed at the lower end of the oil pipe; the elevator and the wellhead flange are sequentially sleeved on the upper part of the oil pipe from top to bottom in an empty manner; the elevator is relatively fixed with the wellhead flange; it is characterized in that the utility model also comprises an annular air bag and an air pipe; the annular air bag is sleeved below a wellhead flange of the oil pipe in an empty manner, is relatively fixed with the wellhead flange and is used for submerging in a geothermal well along with the elevator and the wellhead flange; the air pipe extends into the air bag through the geothermal well casing pipe, the part of the air pipe, which is positioned in the geothermal well casing pipe, is parallel to the oil pipe, and the part of the air pipe, which is positioned outside the geothermal well casing pipe, is provided with a pressure detection unit and an air valve.
Furthermore, the air bag is divided into an upper air bag and a lower air bag which are sequentially sleeved in the area below the wellhead flange of the oil pipe in an empty mode, and the upper air bag is communicated with the lower air bag through an air passage.
Further, the pressure detection unit and the air valve are integrally instrument air valves.
Furthermore, a high-pressure air source is also arranged and used for connecting the upper end of the air pipe and injecting nitrogen into the air bag.
The drainage pipe is communicated with the area of the oil pipe between the wellhead flange and the air bag along the radial direction and is used for discharging overflowing well water.
Furthermore, the type of the drainage tube is DN125, the drainage tube is welded with the geothermal well casing, and a diamond-shaped reinforcing plate is arranged at the position of a welding line.
Further, the elevator is provided with a safety pin for locking the elevator and the wellhead flange during hoisting operation.
Furthermore, a high-pressure pump truck is also arranged and used for injecting isolation fluid and well killing fluid into the oil pipe.
Furthermore, the annular air bag is a high-pressure-resistant silica gel air bag, and the pressure-resistant grade is greater than 15 Map.
The well killing method based on the high-temperature high-pressure self-blowing geothermal well killing device comprises the following steps of:
1) the annular air bag is arranged on the ground and is connected with a high-pressure air source, a control air valve and an exhaust valve through an air pipe;
2) the hoisting elevator is arranged below the oil pipe coupling, the annular air bag is placed into the geothermal well casing through the original wellhead flange, and the distance between the hoisting elevator and the well wall is 5 cm;
3) opening a control valve connected with the oil pipe, and placing an outlet of the high-pressure hose at a position where water can be discharged outside;
4) the high-pressure gas source starts to supply gas, the control gas valve is quickly opened, the high-pressure gas enters the inner cavity of the annular gas bag through the gas pipe, the annular gas bag is expanded under pressure, and the annular space in the geothermal well casing is sealed;
5) closing a control valve connected with the oil pipe;
6) closing the control air valve, observing the nitrogen injected into the control air bag loop, observing whether the pressure gauge of the air bag pressure gauge is stable, observing the pressure gauge of the geothermal well, and recording; if the pressure gauge of the air bag is stable and the pressure of the geothermal well pressure gauge is not increased, opening a hole in the geothermal well casing pipe at a position 150mm below the wellhead flange;
7) pumping accumulated water between the geothermal well casing and the oil pipe by using a water pump, welding a drainage pipe at the opening, and installing a drainage valve;
8) opening a drainage valve, and discharging overflowing well water;
9) opening a control valve connected with an oil pipe, opening an air bag control valve and an exhaust valve, returning the annular air bag, enabling water to overflow from the overflow pipe, observing whether the flange position overflows or not, if the flange at the well mouth overflows, closing the exhaust valve, and closing the air bag control valve; opening an air source valve, inflating and sealing the interior of the annular air bag through a control air valve, filling well killing fluid into the well, observing a geothermal well pressure digital table, and calculating until the wellhead can be controlled not to overflow;
10) hoisting the oil pipe short section and the annular air bag by the elevator;
11) placing the flange gasket, aligning the wellhead device on the wellhead flange, penetrating screws, and firmly connecting and sealing the wellhead device flange and the wellhead flange;
12) and closing the drainage valve to finish construction.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model discloses a set up annular gasbag and trachea, along with elevator and well head flange submergence geothermol power in, can realize interim shutoff and shutoff at any time, guarantee the safety of constructor and equipment.
The utility model discloses still set up drainage tube and drainage valve in the radial outside of oil pipe, the drainage tube is along the region of radial intercommunication oil pipe between well head flange and gasbag, can discharge the well water that the overflow came out.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic view of the overall assembly of an embodiment of the present invention.
Reference numerals:
1-instrument air valve; 2-the trachea; 3-oil pipe; 4-elevator; 5-original wellhead flange; 6-ground; 7-wellhead flange (drop position); 8-geothermal well casing; 9-upper air bag; 10-connecting pipe; 11-lower air bag; 12-a check valve; 13-a drainage tube; 14-drainage valve.
Detailed Description
As shown in fig. 1 and 2, the high-temperature and high-pressure self-blowing geothermal well killing device comprises a well head flange 7, an elevator 4, an oil pipe 3 and a check valve 12, wherein the oil pipe 3 and a geothermal well casing 8 are coaxially arranged, and the check valve 12 is arranged at the lower end of the oil pipe 3; the elevator 4 and the wellhead flange 7 are sequentially sleeved on the upper part of the oil pipe 3 from top to bottom in an empty manner; the elevator 4 is relatively fixed with a wellhead flange 7;
an annular air bag is also sleeved below the wellhead flange 7 of the oil pipe 3; the annular air bag is relatively fixed with the wellhead flange 7 and is used for submerging in a geothermal well along with the elevator 4 and the wellhead flange 7; the air pipe 2 extends into the annular air bag through a geothermal well casing pipe 8, a high-pressure air source is connected to the upper end of the air pipe 2, and nitrogen is injected into the air bag; the annular air bag is divided into an upper air bag 9 and a lower air bag 11, and the upper air bag 9 is communicated with the lower air bag 11 through an air passage; the part of the air pipe 2, which is positioned in the geothermal well casing pipe 8, is parallel to the oil pipe 3, and the part of the air pipe 2, which is positioned outside the geothermal well casing pipe 8, is provided with a pressure detection unit and an air valve.
The high-temperature high-pressure self-blowing geothermal well killing device and the process are divided into two types of temporary plugging and random plugging, wherein the temporary plugging is to replace and modify a wellhead device for temporary use, an air bag is taken out after replacement and modification, and a submersible electric pump is installed; the instant plugging is that the air bag is arranged on a lower well pipeline of the submersible pump, so that the geothermal well can be closed and controlled to automatically flow at any time, and the water feeding efficiency is improved and the oxidation of air to the geothermal well is isolated.
A drainage pipe and a drainage valve can be arranged on the radial outer side of the oil pipe, and the drainage pipe is communicated with the area of the oil pipe 3 between the wellhead flange 7 and the air bag along the radial direction and is used for discharging overflowing well water.
Based on this high temperature high pressure flowing geothermal well killing device, the shutoff is opened 320.4mm (steel grade J55, wall thickness 9.65mm) of 339.7mm wall of a well internal diameter, control high temperature high pressure geothermal water and avoid excessive overflow to scald operating personnel when changing the immersible pump and reforming transform wellhead assembly, can not drown in the pump sump when immersible pump and reforming transform the well head construction down, guarantees the safety of constructor and equipment.
First, on-site assembling well-sealing complete set of air bag set
1. Sleeving an 339.7mm sleeve outside a ground air bag, connecting a high-pressure air source, connecting an exhaust valve, connecting a control air valve, a pressure gauge, connecting an air pipe to an air inlet nozzle at the upper end of the air bag, closing the exhaust valve, opening an air source valve, opening the control air valve to inflate the air bag, expanding the air bag under internal pressure, tensioning the outer wall of the air bag and the inner wall 320.4mm of the 339.7 sleeve, sealing an annular space, observing the pressure gauge, testing the pressure by using the inflation pressure of 2Mpa at one stage of pressure, and observing whether the sealing condition of the air bag; the inflation pressure at the pressure testing stage is 5Mpa, a hammer is used for beating the 339.7mm sleeve to make the sounds consistent with the sounds of the outer ring of the contact position of the air bag, the sounds are consistent and normal, otherwise, the air bag is firstly decompressed, the reason is found, and then the pressure testing is carried out; and in the pressure testing stage, the inflation pressure is not lower than 10Mpa, the air source is closed, the pressure stabilizing time is not lower than 60min, the air pressure drop is less than 0.5Mpa, the air bag is qualified, the control air valve is opened, the exhaust valve is opened slowly, the air in the air bag is exhausted slowly, and whether the return condition of the air bag is qualified is checked.
2. A testing channel is additionally arranged between the air bag core tube and the air bag inner tube, the water pressure change condition of the sealed geothermal well is monitored, in order to ensure that fine changes can be found, a high-precision anti-seismic digital pressure gauge is adopted for measuring, the pressure is found to be increased, the air pressure can be controlled in time, and the air bag is prevented from moving upwards; during testing, the instrument, the pressure release valve and the pressure release pipeline are connected to the pressure test pump, and whether the channel is smooth or not is observed.
And secondly, the upper end of the air bag is connected with an oil lifting pipe which is not less than 4.5 m.
And thirdly, the lifting oil pipe is connected with a control valve and a high-pressure hose.
And fourthly, connecting a control air pipe to an air inlet nozzle at the upper end of the air bag by using a high-pressure air source, hooking the hanging ring by using a crane, hoisting the elevator at the position below the oil pipe coupling, threading a safety pin on the oil pipe elevator, putting the air bag into a 339.7mm sleeve of the geothermal well through a well mouth flange, and centering the elevator at about 5cm distance from the well wall.
And fifthly, opening a control valve connected with the oil pipe to place the outlet of the high-pressure hose at a position where water can be discharged outside when the work is ready.
And sixthly, the high-pressure gas source starts to supply gas, the control gas valve is quickly opened, the high-pressure gas quickly enters the trachea and enters the inner cavity of the air bag, the air bag is expanded under pressure, and the 320.4mm annular space in the sleeve is sealed.
And seventhly, closing the control valve connected with the oil pipe.
Closing the control air valve, observing the injection of nitrogen into the control air bag loop, observing whether the pressure gauge of the air bag pressure gauge is stable, observing the pressure gauge of the geothermal well, and making a record; if the pressure gauge of the air bag is stable and the pressure of the geothermal well pressure gauge does not rise, an open 339.7mm sleeve can be marked at the position 150mm below a wellhead flange and at two positions below the removed length, a plasma cutting tool is used for cutting the sleeve, and the opposite surface of the cut sleeve is vertically cut, so that the cut sleeve can be conveniently taken out.
Pumping accumulated water in an annular space between an opened 339.7mm sleeve and an oil pipe by using a special water pump, welding a DN125 drainage tube at a designed position, installing a drainage valve, and deepening the bottom of the pool if necessary to install the water pump to prepare for drainage.
Welding a wellhead flange to connect a 150mm bypass pipe and an opened 339.7mm sleeve, aligning and welding firmly, wherein the pressure bearing requirement is more than 10Mpa, and uniformly welding four rhombic reinforcing plates with the length of 120mm and the width of 60mm at the position of a welding seam to strengthen the mechanical strength of the welding seam.
And eleventh, opening a valve of the drainage pipe and discharging the overflowing well water.
Opening a control valve connected with the oil pipe, opening an air bag control valve, opening an exhaust valve, returning the air bag, enabling water to overflow from an overflow pipe, observing whether the flange position overflows or not, if the flange position of the well mouth overflows, closing the exhaust valve, closing the air bag control valve, opening an air source valve, inflating and sealing the inside of the air bag through a control air valve, filling well killing liquid into the well, observing a geothermal well pressure digital meter, and calculating until the well mouth does not overflow. The four air valves are generally respectively arranged at the wellhead air pipe, the upper air bag, the central pipe and the lower air bag.
Thirteen, the crane hook lifts the oil pipe elevator to lift the oil pipe nipple and the complete air bag.
And fourteen, well placing the flange gasket, aligning the wellhead device on the wellhead flange, penetrating screws, and firmly connecting the wellhead device flange and the wellhead flange and sealing without water leakage.
And fifteen, closing the drainage valve to finish construction.
Sixthly, safety precaution plan
The air source of 1.12MPa must be used one by one, and in addition, one pump truck of more than 15MPa is prepared, and when the pressure of the geothermal well is increased and the air source cannot be controlled, the pump truck is used for controlling the air bag.
2. When the ground of the air bag is used for pressure test, the two ends of the pressure test sleeve are absolutely not allowed to be detained and passed by people.
3. The field power consumption is not lower than two-stage leakage protection.
4. The front surface of the crane arm is not allowed to be operated by people during hoisting
5. The pressure change of the geothermal well water after the air bag is closed is monitored at any time, the pressure is found to be increased, the air pressure is controlled in time, and a pressure test pump is used for pressurizing when necessary to prevent the air bag from jumping upwards.
Seventeen concrete construction process
1. And (4) dismantling the original whole set of hot water submersible electric pump.
2. And (3) assembling a well-sealing complete set of air bag group, and opening an 339.7mm sleeve outside the ground air bag for pressure test, wherein the pressure test pressure of the air bag is not lower than 10 Mpa.
3. A liquid outlet at the lower end of the lower air bag 11 is connected with a weighted drilling tool and a check valve 12 according to the design requirement.
4. The upper end of an upper air bag 9 is connected with the upper part, the oil pipe nipple is about 3m in length and is connected with an instrument air valve 1, an air inlet nozzle from an air pipe 2 to the upper end of the air bag is hung on a hanging ring by a crane, an elevator 4 is hung at the top of the air bag, a safety pin is arranged below an oil pipe coupling, the oil pipe elevator 4 needs to be threaded, and the air bag is placed into an open sleeve of 339.7mm of a geothermal well through a well mouth flange.
5. The high-pressure air compressor is connected, the air compressor passes through the instrument air valve 1, the air pipe 2 sends high-pressure air into the upper air bag 9 firstly and then enters the lower air bag 11 through the connecting pipe, so that the two air bags are expanded under pressure, and an annular space in an opening sleeve of 339.7mm is sealed.
6. And (4) closing the air valve, observing whether the instrument is stable, and cutting an 339.7mm sleeve at a required position by using a plasma cutting tool if the joint at the position of the air valve and the high-pressure air input connecting pipe is stably removed.
7. The crane hook is lowered, the oil pipe elevator 4 is removed, and an 339.7 mm-cut sleeve and the original wellhead flange 5 are taken out and cut. The specific operation is that the upper air bag is firstly pressurized to observe the pressure of the well mouth, if the pressure is 0, the well pipe at the position of the upper air bag is cut for 1 meter, if the pressure does not return to 0, the upper air bag is pressurized to the lower air bag for secondary packing, and after the observation pressure returns to 0, the well pipe is cut.
8. And an 339.7mm sleeve and a wellhead flange 7 are sleeved in the sleeve, a crane hook is used for lifting 4 oil pipe elevators to lift short joints of the oil pipes, a horizontal ruler is used for leveling the flange, and the flange is welded to the top of the 339.7mm sleeve.
9. Firstly, the high-pressure pump truck is used for pumping into 50m3And (5) low-temperature isolation liquid, and observing whether the pump pressure is reduced or not.
10. Then stirring againThe saturated saline solution is stirred by a tank to prepare a kill well (tap water is used as much as possible), the stirred solution is pressed into the well from the stirring tank to an oil pipe nipple head through a high-pressure pipeline by a 250-type high-pressure pump, and the solution is injected into the well until a pump truck pressure gauge shows zero and reaches 5m3Spacer fluid (clear water or ice particles).
11. The crane hangs the elevator, the instrument air valve 1 discharges high-pressure air in the air bag, whether liquid flows out from the wellhead is observed, if the liquid flows out, high-pressure air is continuously injected, 339.7mm is sealed, the inner ring of the sleeve is opened, the well is continuously pressured, and the air bag group can be lifted.
12. And mounting a complete set of submersible pump and wellhead device, connecting a flange pad cushion below a water pump elbow with a wellhead flange, and starting and testing the well.
Description of materials: an oil pipe of 88.9mm (steel grade H-40 wall thickness 7.34mm inner diameter 76mm drift diameter 71.04mm inner pressure yield strength 39.9MPa connector connection yield strength 412 KN); the air bag is made of high-pressure-resistant silica gel, and the pressure-resistant grade is greater than 15 Map.
Claims (9)
1. The high-temperature high-pressure self-blowing geothermal well killing device comprises a well head flange (7), an elevator (4), an oil pipe (3) and a check valve (12), wherein the oil pipe (3) and a geothermal well casing pipe (8) are coaxially arranged, and the check valve (12) is installed at the lower end of the oil pipe (3); the elevator (4) and the wellhead flange (7) are sequentially sleeved on the upper part of the oil pipe (3) from top to bottom in an empty mode; the elevator (4) is relatively fixed with the wellhead flange (7);
it is characterized by also comprising an annular air bag and an air pipe (2); the annular air bag is sleeved below a wellhead flange (7) of the oil pipe (3) in an empty mode, is fixed relative to the wellhead flange (7), and is used for submerging in a geothermal well along with the elevator (4) and the wellhead flange (7); the gas pipe (2) extends into the gas bag through the geothermal well casing pipe (8), the part of the gas pipe (2) positioned in the geothermal well casing pipe (8) is parallel to the oil pipe (3), and the part of the gas pipe (2) positioned outside the geothermal well casing pipe (8) is provided with a pressure detection unit and a gas valve.
2. The high-temperature high-pressure self-blowing geothermal well killing device according to claim 1, wherein the air bag is divided into an upper air bag (9) and a lower air bag (11), the upper air bag and the lower air bag are sequentially sleeved in an area below a wellhead flange (7) of the oil pipe (3) in an empty mode, and the upper air bag (9) is communicated with the lower air bag (11) through an air path.
3. The high-temperature high-pressure self-blowing geothermal well killing device according to claim 1, wherein the pressure detection unit and the gas valve are integrally an instrument gas valve.
4. A high-temperature high-pressure self-blowing geothermal well killing device according to claim 1, wherein a high-pressure gas source is further provided for connecting the upper end of the gas pipe (2) and injecting nitrogen gas into the gas bag.
5. A high temperature and high pressure self-blowing geothermal well killing device according to claim 1, further comprising a drainage tube and a drainage valve, wherein the drainage tube is radially communicated with the area of the oil pipe (3) between the wellhead flange (7) and the air bag for discharging overflowing well water.
6. The high-temperature high-pressure self-blowing geothermal well killing device according to claim 5, wherein the type of the drainage tube is DN125, the drainage tube is welded with a geothermal well casing, and a diamond-shaped reinforcing plate is arranged at the position of a welding seam.
7. A high temperature and high pressure flowing geothermal well kill apparatus according to claim 1, characterized in that the elevator (4) is provided with a safety pin for locking the elevator (4) and the wellhead flange (7) during the hoisting operation.
8. A high-temperature high-pressure self-blowing geothermal well killing device according to claim 1, wherein a high-pressure pump truck is further provided for injecting a spacer fluid and a killing fluid into the oil pipe (3).
9. The high-temperature high-pressure self-blowing geothermal well killing device of claim 1, wherein the annular air bag is a high-pressure resistant silica gel air bag, and the pressure resistance grade is greater than 15 Map.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021825337.3U CN212250012U (en) | 2020-08-27 | 2020-08-27 | High-temperature high-pressure self-blowing geothermal well killing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021825337.3U CN212250012U (en) | 2020-08-27 | 2020-08-27 | High-temperature high-pressure self-blowing geothermal well killing device |
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| CN212250012U true CN212250012U (en) | 2020-12-29 |
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| CN202021825337.3U Withdrawn - After Issue CN212250012U (en) | 2020-08-27 | 2020-08-27 | High-temperature high-pressure self-blowing geothermal well killing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852455A (en) * | 2020-08-27 | 2020-10-30 | 中石化绿源地热能(陕西)开发有限公司 | High-temperature high-pressure self-blowing geothermal well killing device and method |
-
2020
- 2020-08-27 CN CN202021825337.3U patent/CN212250012U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852455A (en) * | 2020-08-27 | 2020-10-30 | 中石化绿源地热能(陕西)开发有限公司 | High-temperature high-pressure self-blowing geothermal well killing device and method |
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