CA1167760A - System for water extraction in gas producing wells for the reestablishment of gas production - Google Patents
System for water extraction in gas producing wells for the reestablishment of gas productionInfo
- Publication number
- CA1167760A CA1167760A CA000362331A CA362331A CA1167760A CA 1167760 A CA1167760 A CA 1167760A CA 000362331 A CA000362331 A CA 000362331A CA 362331 A CA362331 A CA 362331A CA 1167760 A CA1167760 A CA 1167760A
- Authority
- CA
- Canada
- Prior art keywords
- gas
- pistons
- pump
- accordance
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Reciprocating Pumps (AREA)
Abstract
A B S T R A C T
The invention refers to an improved mechanical system used to extract water in gas producing wells, so as to re-establish their production, of the type which comprehends a combination of a reciprocating surface pump connected to a ball check type pump through a convention rod and string and an apparatus through which gas pressure is used to drive the pistons which actuate the ball check pump so as to extract the water which prevents gas flow from the well.
The invention refers to an improved mechanical system used to extract water in gas producing wells, so as to re-establish their production, of the type which comprehends a combination of a reciprocating surface pump connected to a ball check type pump through a convention rod and string and an apparatus through which gas pressure is used to drive the pistons which actuate the ball check pump so as to extract the water which prevents gas flow from the well.
Description
- ~ ~ 67760 FIELD OF THE INVENTION
The invention relates tv water extraction in gas producing wells.
The system of the surface pump is characterized by a first piston which can be defined as a compensating or counter-balancing one, and a second piston, which can be defined as an actuating one. The gas volume beneath the counter-balancing piston is connected by tubing to a tank, recipient or closed chamber for balancing the pressures. The balance tank pressure is regulated at a sufficient value so as to sustain the counter-balancing piston, together with the rod and string all in equilibrium.
Well head pressure gas pressure and normal collector system pressure is alternately applied to the actuating piston to cause a reciprocating movement. Thusly the differential pressure required to operate the system is small but directly related to the load. The system described is comprised of a reciprocating cylinder mounted on a surface pump, operated by well head gas pressure. Gas flow from the operation of the cylinder is returned to the normal collecter system, with which the weight of the pistons is balanced on the downstroke during which the liquid is displaced on the one hand and the gas to the collector system on the other.
With the idea of simplifying the present invention, a configuration of a combination of two pistons is illustrated, even though it becomes obvious to anyone educated in the art, that a multiplicity of piston combinations is possible.
BACKGROUND OF THE INVENTIO~
Up to now, efforts to recover gas while pumping water from gas producing wells have been unsuccessful. One of the characteristics of this system consists in recovering or using the gas expended in this operation.
For the extraction of natural gas in these wells, one of the big problems is the water deposited in these wells.
~ 1 B7760 This deposit creates columns of water which due to their weight finally impede gas flow for recollection. The solving of this problem has been tried in diverse manners - by pumping water, effervescent tablets, compressed air and other.
Nevertheless, in spite of these efforts, the problem persists, because of the recurring water deposits besides the fact that the operation of the aforementioned methods, permit great losses of gas to the atmosphere. For these reasons, and due to low well pressures which make a well, be considered exhausted and gas extraction rendered costly and of low production.
, SUMMARY OF THE INVENTION
This invention relates to a system for extracting gas and water from gas producing wells, in which the system comprises a reciprocating pump with a vertical impeller characterized by an apparatus in which ~he well gas pressure is directed through tubing, firstly to a recipient or closed chamber, for balance or compensation, and then to the lower opening of a common cylinder driving from beneath the counter-balancing piston which places the weight of the rod in equilibrium to extract water through the ball check pump and by this manner using the well gas pressure as the fountain - of energy.
- It is worth mentioning that when the pump is mounted on a well which is so laden with water, that there is not sufficient gas pressure to begin pump operation, gas flow to start the water extraction process by an assisting additional system and operate th~ pump on a loss basis until there is a flow from the well which will permit normal operation.
In practice, the system may be started with pressure from a gas producing well through appropriate piping from the field collector system, or another well, until normal operation is gained through its own gas flow.
BRIEF_DESCRIPTION OF THE DRAWINGS
The main points regarding the apparatus of this inven-tion will become apparent through the following detailed description of the same, made with reerence to the adjoining drawings :Ln which said invention is illustrated in a schematic ~ . ': . .
:
.
.:
i ~ 6~760 form. In such drawings:
Figure 1 is a vertical elevation of the invention's system, and Figure 2 is a detail of a variant or mode of the invention illustrated in Figure 1, which variant or mode includes the addition of a gas feed line to the aforementioned system from any one feed line of such fluid to load the récipient or closed chamber of the system to begin operation of same.
Returning to Figure 1, the system is adjusted to the piston rod 5 of a gas well.
It will be noted that the stroke of the pistons 13 and 14, that contact the control rod 7, cause the alternating valve 6 to change the two pressures in the tubes 8 and 9 toward the tubes 10 and 11 applied through the piston 13 and causing the reciprocal movement upward and downward. Small pressure differences at the piston 13, cause the operation of the unit because the masses of the rods are in approximate equilibrium approximated by the pressure of the ~essel 1 applied to the piston 14.
The system operates with no gas loss and does not require a significant lowering of the collector system pressure.
The operating pressure differential is directly related to the weiyht of the liquid, influenced by the depth and diameter of the rod string and by the diameter of piston 13.
Speed is controlled by a manual valve 16 which is adjusted to restrict the flow of gas at tube 9. An opening 15 is a part which is always open as a breather to existing atmospheric pressure which is the only force acting on piston 14. This does not imply any restriction on the apparatus or an exact number of pistons if it resulted that the addition of more pistons with their appropriate tubing, would be beneficial to performance under certain given conditions.
In the same Figure 1, piston 14 is shown over piston 13. This does notimply restrictions on the relative position of said pistons within the columnof the cylinder. As can be seen, the apparatus is a cylinder of two or more pistons, mounted over the gas well. Rod 7 of the cylinder extends to the interior of the well casing 4 and operates a rod , I ~ 67760 .
string which pumps the water from the well in the same manner in which oil is pumped in the conventional manner.
The cylinder has a balanci.ng or equilibriating piston 14 which is subject to the regulated gas pressure from deposit 1.
The pressure of this chamber is controlled by the regulating valve 3 and the pressure is suff`icient to raise the total weight of the rod string, and half the weight of the fluid (water). The gas that feeds this re~ulating valve 3 comes directly fronl the well head pre~ure of well 4.
The deposit has a sensitive type relief valve 2 to alleviate excessive pressure caused by rising temperature changes. Gas pressure from deposit 1 raises piston 13 which is secured to a common rod 5 with piston 14. Piston 13 is the operating one and is subject to two pressures that are applied alternately upon it.
The two pressures which operate piston 13, come from tube 9 and collector tube 8. Line pressures 8 and 9 pass through the alternatin~ unit 6 which is operated by control rod 7. This control rod is activated by pistons 13 and 14 when these arrive at the end of their stroke.
With the purpose of clarifying the present invention, the following example is presented with operation data which should be considered illustrative and in some manner limited since it will be evident to persons familiar with the art, that many modifications can be made to the aforementioned invention but always within the scope of the clauses pertaining to the chapter on the novelty of the invention which appears at the end of this description.
EXAMPLE OF T~IE OPERATION
Let us begin by establishin~ that the subsequent data are based on a pump cylinder diameter of 2.85 cm ~1 l/8 ?, a gas cylinder diameter of 30~48 cm (12") and a piston stroke of 91.44 cm (3 ).
`
:
1 ~ ~7~60 OPERATING VALUES:
-Minimum required operating differential: pressuredifferential between well head pressure and the collector system .211 kg/cm2 (3PSI) for each 304.8 m (1000') of well depth.
This value corresponds to 60% of the systems efficiency.
This efficiency may be reduced by friction, viscosity, acceleration forces and rod string drag.
Required operating gas volume (by weight) 0.133m3 (4.673) of gas head pressure per pump cycle at 6 cycles per minute equal to .793m3 (233ft) per minute, at well head pressure. Water pumping rate at 6 cycles per minute = 6 (cycles) X .914m X 60 (min/hr) X 24 (hr/day) X 3048/3.65m X .000199 (m3/16.288cm3). 3.785.42 cm/.87549m 3 = 5064.7 liters/day of water pumped (maximum).
~ It will be observed through these calculations, that a ; well of 1219.2m (4000~) of depth can be pumped with a pressure differential of 4 Kg/cm2 (9.0 pounds) between the well pressure and the normal collection system. In practice, slightly higher pressure differentials may be required, as a result of extrac~ian speed requirements~
The aforegoing example demonstrates the advantages related to the use of this system which is designed to produce the pumping at an absolute minimum energy loss combined with the recuperation of operating gas.
'
The invention relates tv water extraction in gas producing wells.
The system of the surface pump is characterized by a first piston which can be defined as a compensating or counter-balancing one, and a second piston, which can be defined as an actuating one. The gas volume beneath the counter-balancing piston is connected by tubing to a tank, recipient or closed chamber for balancing the pressures. The balance tank pressure is regulated at a sufficient value so as to sustain the counter-balancing piston, together with the rod and string all in equilibrium.
Well head pressure gas pressure and normal collector system pressure is alternately applied to the actuating piston to cause a reciprocating movement. Thusly the differential pressure required to operate the system is small but directly related to the load. The system described is comprised of a reciprocating cylinder mounted on a surface pump, operated by well head gas pressure. Gas flow from the operation of the cylinder is returned to the normal collecter system, with which the weight of the pistons is balanced on the downstroke during which the liquid is displaced on the one hand and the gas to the collector system on the other.
With the idea of simplifying the present invention, a configuration of a combination of two pistons is illustrated, even though it becomes obvious to anyone educated in the art, that a multiplicity of piston combinations is possible.
BACKGROUND OF THE INVENTIO~
Up to now, efforts to recover gas while pumping water from gas producing wells have been unsuccessful. One of the characteristics of this system consists in recovering or using the gas expended in this operation.
For the extraction of natural gas in these wells, one of the big problems is the water deposited in these wells.
~ 1 B7760 This deposit creates columns of water which due to their weight finally impede gas flow for recollection. The solving of this problem has been tried in diverse manners - by pumping water, effervescent tablets, compressed air and other.
Nevertheless, in spite of these efforts, the problem persists, because of the recurring water deposits besides the fact that the operation of the aforementioned methods, permit great losses of gas to the atmosphere. For these reasons, and due to low well pressures which make a well, be considered exhausted and gas extraction rendered costly and of low production.
, SUMMARY OF THE INVENTION
This invention relates to a system for extracting gas and water from gas producing wells, in which the system comprises a reciprocating pump with a vertical impeller characterized by an apparatus in which ~he well gas pressure is directed through tubing, firstly to a recipient or closed chamber, for balance or compensation, and then to the lower opening of a common cylinder driving from beneath the counter-balancing piston which places the weight of the rod in equilibrium to extract water through the ball check pump and by this manner using the well gas pressure as the fountain - of energy.
- It is worth mentioning that when the pump is mounted on a well which is so laden with water, that there is not sufficient gas pressure to begin pump operation, gas flow to start the water extraction process by an assisting additional system and operate th~ pump on a loss basis until there is a flow from the well which will permit normal operation.
In practice, the system may be started with pressure from a gas producing well through appropriate piping from the field collector system, or another well, until normal operation is gained through its own gas flow.
BRIEF_DESCRIPTION OF THE DRAWINGS
The main points regarding the apparatus of this inven-tion will become apparent through the following detailed description of the same, made with reerence to the adjoining drawings :Ln which said invention is illustrated in a schematic ~ . ': . .
:
.
.:
i ~ 6~760 form. In such drawings:
Figure 1 is a vertical elevation of the invention's system, and Figure 2 is a detail of a variant or mode of the invention illustrated in Figure 1, which variant or mode includes the addition of a gas feed line to the aforementioned system from any one feed line of such fluid to load the récipient or closed chamber of the system to begin operation of same.
Returning to Figure 1, the system is adjusted to the piston rod 5 of a gas well.
It will be noted that the stroke of the pistons 13 and 14, that contact the control rod 7, cause the alternating valve 6 to change the two pressures in the tubes 8 and 9 toward the tubes 10 and 11 applied through the piston 13 and causing the reciprocal movement upward and downward. Small pressure differences at the piston 13, cause the operation of the unit because the masses of the rods are in approximate equilibrium approximated by the pressure of the ~essel 1 applied to the piston 14.
The system operates with no gas loss and does not require a significant lowering of the collector system pressure.
The operating pressure differential is directly related to the weiyht of the liquid, influenced by the depth and diameter of the rod string and by the diameter of piston 13.
Speed is controlled by a manual valve 16 which is adjusted to restrict the flow of gas at tube 9. An opening 15 is a part which is always open as a breather to existing atmospheric pressure which is the only force acting on piston 14. This does not imply any restriction on the apparatus or an exact number of pistons if it resulted that the addition of more pistons with their appropriate tubing, would be beneficial to performance under certain given conditions.
In the same Figure 1, piston 14 is shown over piston 13. This does notimply restrictions on the relative position of said pistons within the columnof the cylinder. As can be seen, the apparatus is a cylinder of two or more pistons, mounted over the gas well. Rod 7 of the cylinder extends to the interior of the well casing 4 and operates a rod , I ~ 67760 .
string which pumps the water from the well in the same manner in which oil is pumped in the conventional manner.
The cylinder has a balanci.ng or equilibriating piston 14 which is subject to the regulated gas pressure from deposit 1.
The pressure of this chamber is controlled by the regulating valve 3 and the pressure is suff`icient to raise the total weight of the rod string, and half the weight of the fluid (water). The gas that feeds this re~ulating valve 3 comes directly fronl the well head pre~ure of well 4.
The deposit has a sensitive type relief valve 2 to alleviate excessive pressure caused by rising temperature changes. Gas pressure from deposit 1 raises piston 13 which is secured to a common rod 5 with piston 14. Piston 13 is the operating one and is subject to two pressures that are applied alternately upon it.
The two pressures which operate piston 13, come from tube 9 and collector tube 8. Line pressures 8 and 9 pass through the alternatin~ unit 6 which is operated by control rod 7. This control rod is activated by pistons 13 and 14 when these arrive at the end of their stroke.
With the purpose of clarifying the present invention, the following example is presented with operation data which should be considered illustrative and in some manner limited since it will be evident to persons familiar with the art, that many modifications can be made to the aforementioned invention but always within the scope of the clauses pertaining to the chapter on the novelty of the invention which appears at the end of this description.
EXAMPLE OF T~IE OPERATION
Let us begin by establishin~ that the subsequent data are based on a pump cylinder diameter of 2.85 cm ~1 l/8 ?, a gas cylinder diameter of 30~48 cm (12") and a piston stroke of 91.44 cm (3 ).
`
:
1 ~ ~7~60 OPERATING VALUES:
-Minimum required operating differential: pressuredifferential between well head pressure and the collector system .211 kg/cm2 (3PSI) for each 304.8 m (1000') of well depth.
This value corresponds to 60% of the systems efficiency.
This efficiency may be reduced by friction, viscosity, acceleration forces and rod string drag.
Required operating gas volume (by weight) 0.133m3 (4.673) of gas head pressure per pump cycle at 6 cycles per minute equal to .793m3 (233ft) per minute, at well head pressure. Water pumping rate at 6 cycles per minute = 6 (cycles) X .914m X 60 (min/hr) X 24 (hr/day) X 3048/3.65m X .000199 (m3/16.288cm3). 3.785.42 cm/.87549m 3 = 5064.7 liters/day of water pumped (maximum).
~ It will be observed through these calculations, that a ; well of 1219.2m (4000~) of depth can be pumped with a pressure differential of 4 Kg/cm2 (9.0 pounds) between the well pressure and the normal collection system. In practice, slightly higher pressure differentials may be required, as a result of extrac~ian speed requirements~
The aforegoing example demonstrates the advantages related to the use of this system which is designed to produce the pumping at an absolute minimum energy loss combined with the recuperation of operating gas.
'
Claims (7)
1. An improved mechanical system for the extraction of water in gas producing wells to reestablish gas production, said system being of the type which comprises in combination a reciprocating surface pump connected to a ball check type pump through a weight transmitting rod connected by a first pipe to a recipient or closed chamber; wherein said system is characterized by said reciprocating pump comprising a cylinder mounted over a gas well and having at least a pair of spaced counterbalancing pistons therein, a rod inter connecting said pistons and extending into the interior of said well to operate a rod string in the well for pumping fluid therefrom; pressure differential between the interior of said cylinder and the well head being counterbalanced by the piston connecting rod from said ball check pump; and a control rod, actuated by either of said pistons responsive to movement thereof, and actuating in turn an alternating valve which opens or closes passage of gas to a collector system of said gas, the extraction of said gas which has been reestablished.
2. System in accordance with claim 1, also characterized by a gas flow mechanism and a set of valves to direct the reciprocating action of the cylinder.
3. System in accordance with claim 2 also char-acterized by a repetitive multiple cylinder unit.
4. System in accordance with claim 3 further char-acterized by the cylinders including pistons in pairs.
5. System in accordance with claim 4 characterized by the pistons being arranged in a parallel arrangement.
6. System in accordance with claim 5, characterized by the pistons being arranged in the configuration of a cross.
7. System in accordance with claims 1 or 6 char-acterized in that said apparatus to regulate the speed of the pump a combination access valve to the recipient or closed chamber is used, and the water access valve to the alternating mechanism of flow control change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000362331A CA1167760A (en) | 1980-10-14 | 1980-10-14 | System for water extraction in gas producing wells for the reestablishment of gas production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000362331A CA1167760A (en) | 1980-10-14 | 1980-10-14 | System for water extraction in gas producing wells for the reestablishment of gas production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1167760A true CA1167760A (en) | 1984-05-22 |
Family
ID=4118143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000362331A Expired CA1167760A (en) | 1980-10-14 | 1980-10-14 | System for water extraction in gas producing wells for the reestablishment of gas production |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1167760A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5860795A (en) * | 1996-03-22 | 1999-01-19 | Alberta Research Council | Method for underground-reservoir fluids production with pump drive contained within the wellbore |
| WO2014190406A1 (en) | 2013-05-28 | 2014-12-04 | Lifteck International Inc. | Downhole pumping apparatus and method |
-
1980
- 1980-10-14 CA CA000362331A patent/CA1167760A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5860795A (en) * | 1996-03-22 | 1999-01-19 | Alberta Research Council | Method for underground-reservoir fluids production with pump drive contained within the wellbore |
| US6234770B1 (en) | 1996-03-22 | 2001-05-22 | Alberta Research Council Inc. | Reservoir fluids production apparatus and method |
| WO2014190406A1 (en) | 2013-05-28 | 2014-12-04 | Lifteck International Inc. | Downhole pumping apparatus and method |
| US10066468B2 (en) | 2013-05-28 | 2018-09-04 | Lifteck International Inc. | Downhole pumping apparatus and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |