CN103306643B - A kind of water drainage gas production device and method - Google Patents
A kind of water drainage gas production device and method Download PDFInfo
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- CN103306643B CN103306643B CN201310288234.6A CN201310288234A CN103306643B CN 103306643 B CN103306643 B CN 103306643B CN 201310288234 A CN201310288234 A CN 201310288234A CN 103306643 B CN103306643 B CN 103306643B
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Abstract
The present invention relates to a kind of water drainage gas production device and method, the method comprises the following steps: transfer to shaft bottom by pressure gauge by the first oil pipe, measure static bottom-hole pressure and liquid level, the well-sealing device mated with it according to pressure selection also sets the force value of blanking plug and gas lift valve; Remove former wellhead assembly, gas producing device is improved on the basis that former wellhead assembly exists; Suppressing in the second oil pipe with nitrogen, when reaching the opening pressure of blanking plug, opening blanking plug; Continuation nitrogen is suppressed in the second oil pipe, when reaching the opening pressure of gas lift valve, opens gas lift valve step by step, by pit shaft, the liquid in shaft bottom discharges, till natural gas is produced by shaft bottom blowing.Beneficial effect of the present invention is: the present invention can utilize nitrogen gaslift repeatedly induced flow, open gas lift valve, liquid bottom oil pipe is discharged, significantly reduce slippage loss, reduce shaft bottom ponding, thus extend the gas well liquid loading cycle, simple to operate, the with low cost and sealingly secure of this invention, reliable in addition.
Description
Technical field
The present invention relates to oil field (in energy extraction) gas production field, in particular to a kind of water drainage gas production device and method.
Background technology
Natural gas is the imflammable gas being stored in depths, the end, ground, is a kind of clean, convenient, efficient fuel, is also a kind of important industrial chemicals, has higher economic worth.
Existing Gas Exploitation acquisition means mainly comprises the first four-way be connected with down-hole casing, the first tubing hanger be connected in the first four-way is connected with the first oil pipe in down-hole casing, utilize strata pressure by the first oil pipe directly by the gas of down-hole ejection outer wellhead, but in actual production, a large amount of formation waters mixes with natural gas, when gas production is higher, and oily velocity in pipes higher than critical point time, gas can water-band to ground; Along with gas well recovery time extends, the residual recoverable reserves of mine gas reduces gradually, strata pressure, bottom pressure, well head pressure all constantly reduce, oil velocity in pipes is lower than critical point, and part water is slipped in pit shaft, and pit shaft hydrops acquires a certain degree, form water logging, gas cannot be got rid of thus, thus causes the underproduction, even occurs stopping production.
For reducing wellhead back pressure, improving output pressure, improving the requirements such as the flow velocity of Particle in Vertical Pipe Flow, the little oil pipe that original oil pipe is only changed into band gas lift valve by prior art is produced, so just must go up workover rig, extract former well casing post, lower little oil pipe not only causes rehabilitation cost high, and kill-job must cause well killing fluid to be missed in a large number to stratum, formation injury is very large, cannot return to normal production after even repairing.Prior art also carries out gas production by coiled tubing water pumping gas production (speed tubing string method) in addition, the greatest problem of this technique is when strata pressure continues to drop to a certain degree with production, shaft bottom hydrops amount is on the increase, because coiled tubing cannot connect gas lift valve, shaft bottom forms new water logging, hydrops cannot be discharged, and causes gas cannot discharge from air collecting pipe and causes stopping production.
Summary of the invention
The object of the present invention is to provide a kind of water drainage gas production device and method, to solve the above problems.
A kind of water drainage gas production device is provided in the embodiment of the present invention, comprise the first four-way, the first oil pipe and sleeve pipe, first oil pipe intercalation is in sleeve pipe, the bottom of the first four-way is connected with sleeve pipe, first oil pipe is connected with the first tubing hanger be stuck in the first four-way, the top of the first four-way is connected with the second four-way, in second four-way, card has the second tubing hanger, second tubing hanger bottom connects the second oil pipe, second oil pipe is longitudinally successively through the second four-way, the first four-way, and intercalation is in the first oil pipe, between the first oil pipe and the second oil pipe, form airtight toroidal cavity; The the second oil pipe internal fixtion being positioned at down-hole is connected with some grades of gas lift valves, and the second oil pipe bottom is connected with blanking plug, be connected with below blanking plug with blanking plug with the use of blanking plug recycling bin.
Additionally provide a kind of water pumping gas production method in the embodiment of the present invention, the method comprises the following steps:
1) pressure gauge is transferred to shaft bottom by the first oil pipe, measure static bottom-hole pressure and liquid level, set the opening pressure value of blanking plug and gas lift valve according to the well-sealing device of pressure selection pressure rating coupling;
2) remove former wellhead assembly, and improve gas producing device on the basis that former wellhead assembly exists;
3), after gas producing device is installed, suppress in the first oil pipe with nitrogen, when force value reaches the opening pressure of blanking plug, open blanking plug;
4) continuation nitrogen is suppressed in the first oil pipe, when pressure reaches the opening pressure of gas lift valve, opens gas lift valve step by step, by pit shaft, the liquid in shaft bottom discharges, till natural gas is produced by shaft bottom blowing.
Beneficial effect of the present invention: the present invention, under the protection of safety device, changes the cross-sectional area of flow string, keeps, on basis that flow velocity is constant, significantly can reducing slippage loss, reduce shaft bottom ponding, thus extend the gas well liquid loading cycle at production declining; In process of production, the airtight annular space gas production that the first oil pipe and the second oil pipe are formed can be utilized, also can utilize little oil pipe gas production.Along with the prolongation of production time, when strata pressure drop to a certain degree, output reduces gradually, shaft bottom water accumulating volume increase time, the present invention utilizes nitrogen gaslift repeatedly induced flow, when reaching certain pressure, gas lift valve in second oil pipe is opened, and the liquid in shaft bottom is discharged, thus realize circulation gaslift liquid discharging gas producing, simple to operate, the with low cost and sealingly secure of this invention, reliably formation injury are simultaneously minimum, and can by the ponding emptying of shaft bottom and near wellbore zone.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of water drainage gas production device described in the embodiment of the present invention;
Fig. 2 is the installation sectional view of the medium and small four-way of a kind of water drainage gas production device described in the embodiment of the present invention, triple ram preventer, ring shaped capping apparatus;
Fig. 3 is the flow chart of a kind of water pumping gas production method described in the embodiment of the present invention.
In Fig. 1,
1, triple ram preventer; 2, the second four-way; 3, the first four-way; 4, gas lift valve; 5, sleeve pipe; 6, the first oil pipe; 7, the second oil pipe; 8, blanking plug; 9, blanking plug recycling bin; 10, ring shaped capping apparatus; 11, slip flashboard; 12, partly flashboard is sealed; 13, shear ram.
Detailed description of the invention
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
Embodiment 1, as illustrated in fig. 1 and 2, a kind of water drainage gas production device, comprise the first four-way 3, first oil pipe 6 and sleeve pipe 5, first oil pipe 6 intercalation is in sleeve pipe 5, the bottom of the first four-way is connected with sleeve pipe, first oil pipe is connected with the first tubing hanger be stuck in the first four-way, the top of the first four-way is connected with the second four-way 2, in second four-way, card has the second tubing hanger, second tubing hanger bottom connects the second oil pipe 7, second oil pipe is longitudinally successively through the second four-way, first four-way, and intercalation is in the first oil pipe, airtight toroidal cavity is formed between first oil pipe and the second oil pipe, the the second oil pipe internal fixtion being positioned at down-hole is connected with some grades of gas lift valves 4, second oil pipe bottom and is connected with blanking plug 8, be connected with below blanking plug with blanking plug with the use of blanking plug recycling bin 9.
The design of gas lift valve is mounted in the valve on the second oil pipe, and gas lift valve is the important tool implementing gas lift method, and the effect of gas lift valve comprises: gas injection passage during gaslift operation; The switch of injecting hole on lifting tubing string; With lower startup gas injection pressure, the liquid level in well is down to desired depth, and produces by expected yield with the required gas injection pressure that normally works in this degree of depth; The gas injection degree of depth can be changed neatly, to adapt to the change of gas well fluid supply capacity; Utilize gas lift valve to change the lifting degree of depth, increase gas well liquid loading pressure reduction, remove with clean oil reservoir and pollute; Gaslift is the same with other artificial artificial lifting way, can set up required flowing bottomhole pressure (FBHP), reaches the lifting rate of expection.
The effect of blanking plug and blanking plug recycling bin: when borehole pressure is too high, blanking plug blocks the passage of the second oil pipe, and borehole pressure is higher, blocks tighter; When being depressed into rated pressure from forehand in the second oil pipe, piston in blanking plug can be squeezed in blanking plug recycling bin, after the piston of blanking plug enters blanking plug recycling bin, blanking plug recycling bin is communicated with the second oil pipe, easy to operate, the design of blanking plug ensure that the safety of device when operating.
This device also comprises triple ram preventer 1 and ring shaped capping apparatus 10, and described triple ram preventer is connected with the second four-way top, and Flange joint is passed through on the bottom of described ring shaped capping apparatus and the top of described pressure control device.
Described triple ram preventer comprises slip flashboard 11, half envelope flashboard 12 and shear ram 13, the effect of triple ram preventer: when the annular space pressure of the first oil pipe and the second oil pipe is higher than pressure needed for safety operation, half envelope flashboard cuts out half envelope, guarantee natural gas is non-leakage, start slip flashboard simultaneously and block the second oil pipe, ensure the not upper string of the second oil pipe; When the annular space pressure of the first oil pipe and the second oil pipe higher than the pressure needed for safety operation and think must stop lower second oil pipe operation time, start shear ram, cut off the second oil pipe and make the second oil pipe fall in well, close the total valve gathered on four-way, thus it is safe, reliable to ensure that this device operates.The design of ring shaped capping apparatus ensure that the closure of annular space between the second oil pipe and the first oil pipe, and ensure that device normally lower pipe, handling safety is reliable.
The second oil pipe is provided with in first oil pipe of this device, in process of production, can produce by the annular space that formed by the first oil pipe and the second oil pipe of Selection utilization, also can select directly to be produced by little oil pipe, along with the prolongation of gas production production time, when strata pressure drops to a certain degree, hydrops amount is continued in shaft bottom to be increased, and utilizes nitrogen gaslift induced flow, is opened the gas lift valve be provided with in the second oil pipe, the liquid in shaft bottom is discharged, thus realizes circulation gaslift liquid discharging gas producing.This device is minimum in the injury of simple to operate, with low cost, sealingly secure, reliably simultaneously formation, and can by the ponding emptying of shaft bottom and near wellbore zone.
Embodiment 2, as shown in Figure 3, a kind of water pumping gas production method, the method comprises the following steps:
1) pressure gauge is transferred to shaft bottom by the first oil pipe, measure static bottom-hole pressure and liquid level, set the opening pressure value of blanking plug and gas lift valve according to the well-sealing device of pressure selection pressure rating coupling;
2) remove former wellhead assembly, and improve gas producing device on the basis that former wellhead assembly exists;
3), after gas producing device is installed, suppress in the second oil pipe with nitrogen, when force value reaches the opening pressure of blanking plug, open blanking plug;
4) continuation nitrogen is suppressed in the second oil pipe, when pressure reaches the opening pressure of gas lift valve, opens gas lift valve step by step, by pit shaft, the liquid in shaft bottom discharges, till natural gas is produced by shaft bottom blowing.
Preferably, in step 1), have pressure if detect in the first oil pipe, but insufficient pressure is to make natural gas blowing, uses steel wire to be sent into by the blanking plug matched with the first oil pipe bottom the first oil pipe and block the first oil pipe.Bleed off the residual pressure in the first oil pipe, then enter step 2); If without pressure in the first oil pipe, then directly enter step 2).
Further, step 2) in, remove former wellhead assembly, and on the basis that former wellhead assembly exists, improve gas producing device comprise the following steps:
1) from down to up the second four-way, triple ram preventer and ring shaped capping apparatus are installed successively at the top of original first four-way;
2) the second oil pipe with multistage gas lift valve is passed through successively ring shaped capping apparatus, triple ram preventer, the second four-way and the first four-way intercalation in described first oil pipe;
3) blanking plug recycling bin, blanking plug are transferred successively to the second oil pipe bottom;
4) remove triple ram preventer, ring seal successively, then by the second four-way top, the second tubing hanger is installed, and make bottom and the second oil pipe snapping of the second tubing hanger.
The advantage of gas production method of the present invention comprise following some:
1) gas production method provided by the present invention significantly can reduce slippage loss, reduces shaft bottom ponding, can significantly extend the gas well liquid loading cycle.
2) in process of production, the airtight annular Space-time idea formed by the first oil pipe and the second oil pipe can be utilized, also directly can produce with little oil pipe (the second oil pipe), along with the prolongation of production time, when strata pressure drop to a certain degree shaft bottom form new hydrops time, utilize nitrogen gaslift induced flow, when reaching certain pressure, opened by gas lift valve in second oil pipe, the liquid in shaft bottom is discharged, thus realizes circulation gaslift liquid discharging gas producing.
3) in the present invention, gas lift valve can repeatedly use, as long as gas well causes stopping production due to ponding, namely reproduces by nitrogen gaslift induced flow.
4) formation of the present invention injury is minimum, and can by the ponding emptying of shaft bottom and near wellbore zone.
5) simple to operate: clean-out crew uses small-scale workshops machine (load is less than 15 tons) can play oil pipe.And the activity duration is short, workover cost is low.
6) safe and reliable: before operation, to gas well carry out pressure measurement, survey liquid level, grasp subsurface information, for select pressure control device and well-sealing device ready.Pressure control device also can be selected according to this area's original formation pressure, or the well control device of selection and a gas production wellhead pressure rating.
7) total cost is low: be the 60%-70% of coiled tubing water pumping gas production method cost.(1) workover cost is low; (2) plain tubing cost is lower than coiled tubing; (3) with common gas production completion method ratio, during gaslift, nitrogen use level is few.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a water drainage gas production device, comprise the first four-way (3), first oil pipe (7) and sleeve pipe (5), first oil pipe intercalation is in sleeve pipe, the bottom of the first four-way is connected with sleeve pipe, first oil pipe is connected with the first tubing hanger be stuck in the first four-way, it is characterized in that: the top of the first four-way is connected with the second four-way (2), in second four-way, card has the second tubing hanger, second tubing hanger bottom connects the second oil pipe (6), second oil pipe is longitudinally successively through the second four-way, first four-way, and intercalation is in the first oil pipe, airtight toroidal cavity is formed between first oil pipe and the second oil pipe, the the second oil pipe internal fixtion being positioned at down-hole is connected with some grades of gas lift valves (4), and the second oil pipe bottom is connected with blanking plug (8), be connected with below blanking plug with blanking plug with the use of blanking plug recycling bin (9),
This device also comprises triple ram preventer (1) and ring shaped capping apparatus (10), and triple ram preventer is connected with the top of the second four-way, and Flange joint is passed through on the bottom of ring shaped capping apparatus and the top of triple ram preventer.
2. use a water pumping gas production method for water drainage gas production device described in claim 1, it is characterized in that: the method comprises the following steps:
1) pressure gauge is transferred to shaft bottom by the first oil pipe, measure static bottom-hole pressure and liquid level, set the opening pressure value of blanking plug and gas lift valve according to the well-sealing device of pressure selection pressure rating coupling;
2) remove former wellhead assembly, and improve gas producing device on the basis that former wellhead assembly exists;
3), after gas producing device is installed, suppress in the second oil pipe with nitrogen, when force value reaches the opening pressure of blanking plug, open blanking plug;
4) continuation nitrogen is suppressed in the second oil pipe, when pressure reaches the opening pressure of gas lift valve, opens gas lift valve step by step, by pit shaft, the liquid in shaft bottom discharges, till natural gas is produced by shaft bottom blowing.
3. water pumping gas production method according to claim 2, it is characterized in that: in step 1), if detect in the first oil pipe and have pressure, but insufficient pressure is to make natural gas blowing, steel wire is used to be sent into by the blanking plug matched with the first oil pipe bottom the first oil pipe and to block the first oil pipe, bleed off the residual pressure in the first oil pipe, then enter step 2); If without pressure in the first oil pipe, then directly enter step 2).
4. water pumping gas production method according to claim 2, is characterized in that: step 2) in, remove former wellhead assembly, and on the basis that former wellhead assembly exists, improve gas producing device comprise the following steps:
1) from down to up the second four-way, triple ram preventer and ring shaped capping apparatus are installed successively at the top of original first four-way;
2) the second oil pipe with multistage gas lift valve is passed through successively ring shaped capping apparatus, triple ram preventer, the second four-way and the first four-way intercalation in described first oil pipe;
3) blanking plug recycling bin, blanking plug are transferred successively to the second oil pipe bottom;
4) remove triple ram preventer, ring seal successively, then by the second four-way top, the second tubing hanger is installed, and make the second tubing hanger bottom and the second oil pipe snapping.
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| CN201310288234.6A CN103306643B (en) | 2013-07-10 | 2013-07-10 | A kind of water drainage gas production device and method |
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| CN201310288234.6A CN103306643B (en) | 2013-07-10 | 2013-07-10 | A kind of water drainage gas production device and method |
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| CN103306643B true CN103306643B (en) | 2015-09-23 |
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