1. A method for improving liquid injection into a rock formation, the method including the following steps:
introducing a gas impulse device into a wellbore in the formation;
pumping a pressurized liquid into the wellbore; and
firing the gas impulse device periodically so that the device generates impulses of high pressure compressed gas which when the gas expands through the pumped pressurized liquid substantially instantaneously increases the liquid flow rate into the rock formation, and creates rapid cyclical injected liquid surges into the rock formation with liquid oscillation occurring inside the fractures andor pores of the formation
2. A method according to claim 1, further including the step of monitoring the pressure or injection rate of the pressurized liquid.
3. A method according to claim 2, further including the step of periodically adjusting the pressure or injection rate of the pressurized injected liquid based on the results of the step of monitoring so that the pressure or injection rate of the injected liquid remain within a predetermined range.
4. A method according to claim 1 further including the step of estimating the pressure or injection rate of the pressurized liquid required for improving liquid flow into the formation,
wherein the pressure or injection rate of the pumped pressurized liquid in said step of pumping ranges from about 25% to about 100% of the estimated injection pressure or injection rate and is periodically adjusted so that the pumped liquid pressure or injection rate remains in that range, and
wherein the gas impulse device working pressure in said step of firing is at least 10 bars greater than the pumped injection liquid pressure.
5. A method according to claim 1 wherein said compressed gas of said step of firing forms bubbles oscillating between expansion and contraction within the pressurized liquid thereby improving injected liquid flow distribution over the fractures andor pores of the rock formation.
6. A method according to claim 1 wherein said step of pumping the liquid is pumping a liquid that comprises hazardous, industrial andor municipal wastes.
7. A method according to claim 1 wherein said rock formation is an oil containing rock formation and said method further includes the step of monitoring oil production in at least one production well of the oil containing rock formation.
8. A method according to claim 7, further including the step of periodically adjusting the pressure of the gas supplied to the gas impulse device based on the results of the step of monitoring oil production so that the pressure of the supplied gas remains within a predetermined range.
9. A method according to claim 7, further including the step of periodically adjusting the pressure or injection rate of the pressurized liquid based on the results the step of monitoring oil production so that the pressure or injection rate of the injected liquid remains within a predetermined range.
10. A method according to claim 7, further including the step of estimating the pressure or injection rate of the pressurized liquid required for improving liquid flow into the formation.
11. A method according to claim 10, wherein the pressure or injection rate of the pumped pressurized liquid in said step of pumping ranges from about 25% to about 100% of the estimated injection pressure or injection rate and wherein the gas impulse device working pressure in said step of firing is at least 10 bars greater than the pumped injection liquid pressure and
wherein at least one of the following parameters is periodically adjusted based on the results of said step of monitoring oil production so that the at least one parameter remains within a predetermined range:
pressure of the compressed gas supplied to the gas impulse device;
pressure of the pressurized injection liquid; and
rate of injection of the pressurized injection liquid.
12. A method according to claim 7, wherein said compressed gas of said step of firing forms bubbles oscillating between expansion and contraction within the pressurized liquid, thereby improving oil displacement by the injected liquid inside the oil containing rock formation.
13. A method according to claim 1, wherein said method is employed for extracting residual oil in an oil formation in which oil production has substantially ceased, and
where said step of introducing a gas impulse device into a wellbore, includes introducing the device into a wellbore in a formation where oil production has substantially ceased, and
wherein said step of firing the gas impulse device periodically generates impulses of high pressure compressed gas which when the gas expands through the pumped pressurized liquid substantially instantaneously increases the liquid pressurized flow rate into the oil formation causing residual oil found in fractures andor pores of high flow resistance to flow toward and empty into nearby producing wells.
14. A method according to claim 13, further including the step of monitoring the rate of discharged residual oil.
15. A method according to claim 14, further including the step of periodically adjusting the pressure of the gas supplied to the gas impulse device or the pressure or injection rate of the injected liquid based on the results of the monitored rate of discharged residual oil so that the gas pressure or the liquid pressure or liquid injection rate remain within a predetermined range.
16. A method according to claim 13, further including the step of monitoring the pressure or injection rate of the injected liquid.
17. A method according to claim 16, further including the step of periodically adjusting the pressure or injection rate of the injected liquid based on the pressure or rate determined in said step of monitoring so that the pressure or injection rate of the injected liquid remain within a predetermined range.
18. A method according to claim 13, wherein said compressed gas in said step of firing forms oscillating bubbles, which expand and contract within the injected pressurized liquid periodically, thereby improving residual oil displacement from the formation that has substantially ceased production towards a well that still is a producing well.
19. The method according to claim 1, said method used for preventing drilling fluid lost circulation,
wherein said step of introducing a gas impulse device into a wellbore in the formation, the formation at least partially includes a drilling fluid \u201cthief\u201d zone, and
wherein said step of pumping a pressurized liquid, the pressurized liquid is a pressurized sealing slurry which when pumped into the wellbore covers at least a portion of the \u201cthief\u201d zone, and
wherein said step of firing the gas impulse device, the device expels gas which expands through the slurry substantially instantaneously increasing the slurry flow rate into the formation causing fissured and porous regions of the formation to be sealed with the sealant slurry.
20. A method according to claim 19, said method further including the step of moving the device along the \u201cthief\u201d zone so that the gas impulse device is fired all along the zone so that the sealing slurry can enter the fissures and porous regions throughout all portions of the \u201cthief\u201d zone.
21. A method according to claim 19, further including the step of monitoring at least one of the following: the pressure of the pumped pressurized sealing slurry; the injection rate of the pumped pressurized sealing slurry; and the density of the pressurized sealing slurry.
22. A method according to claim 21, further including the step of periodically adjusting at least one of the following parameters: the pressure of the pressurized sealing slurry; the injection rate of the pressurized sealing slurry; the density of the pressurized sealing slurry; and the pressure of the compressed gas supplied to the gas impulse device, where said adjustment is based on the pressure, rate andor density determined in said step of monitoring so that the at least one parameter remains within a predetermined range.
23. A method according to claim 19 wherein said step of firing, the device expels gas which expands through the slurry substantially instantaneously increasing the slurry flow rate into the formation and creates rapid cyclical injected slurry surges into the rock formation with liquid oscillation occurring inside the fractures andor pores of the formation.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A play yard comprising:
a collapsible upper frame;
a collapsible lower frame;
posts to support the upper frame above the lower frame, the posts including respective channels; and
a foldable, frameless enclosure operatively coupled to the upper frame, the lower frame and the posts, the enclosure having a plurality of sides and a bottom to define an enclosure volume, the enclosure having a plurality of corner beads dimensioned for receipt in a respective one of the channels to secure the enclosure to the posts.
2. A play yard as defined in claim 1, wherein each of the posts includes a substantially exposed, outward facing surface.
3. A play yard as defined in claim 1, wherein the enclosure includes first sleeves dimensioned to receive the upper frame and second sleeves dimensioned to receive the lower frame.
4. A play yard as defined in claim 1, wherein at least a portion of each of the posts is curved.
5. A play yard as defined in claim 4, wherein the channels follow curvatures of the posts.
6. A play yard as defined in claim 1, wherein a first one of the sides and a second one of the sides extend from one of the channels in one of the posts, the first one of the sides extending in a first direction and the second one of the sides extending in a second direction different than the first direction.
7. A play yard comprising:
a frame movable between an erected position and a collapsed position, the frame including an upper frame and a lower frame;
a post positioned between the upper frame and the lower frame, the post having an inner portion including a channel; and
a flexible enclosure having a first side, a second side and a bottom side, a corner bead threaded into the channel to couple the enclosure to the post.
8. A play yard as defined in claim 7, wherein the enclosure extends along the post between the upper frame and the lower frame.
9. A play yard as defined in claim 7, the post comprising a wall that defines an interior cavity and the channel separate from the interior cavity.
10. A play yard as defined in claim 7, wherein the first side and the second side extend from the channel, the first side extending in a first direction and the second side extending in a second direction different than the first direction.
11. A play yard comprising:
a collapsible upper frame;
a collapsible lower frame;
posts to support the upper frame above the lower frame, the posts defining respective channels; and
a foldable, frameless enclosure operatively coupled to the upper frame, the lower frame and the posts, the enclosure having a plurality of sides and a bottom to define an enclosure volume, the enclosure having a plurality of corner beads dimensioned for receipt in a respective one of the channels to secure the enclosure to the posts.
12. A play yard as defined in claim 11, wherein the channels are integrally formed within respective ones of the posts.
13. A play yard as defined in claim 11, wherein a first one of the sides and a second one of the sides extend from one of the channels, the first one of the sides extending in a first direction and the second one of the sides extending in a second direction different than the first direction.
14. A play yard as defined in claim 11, wherein at least a portion of each of the posts is curved.
15. A play yard as defined in claim 14, wherein the channels follow respective curvatures of the posts.
16. A play yard as defined in claim 11, wherein each of the posts includes a substantially exposed, outward facing surface.
17. A play yard as defined in claim 11, each of the posts comprising a wall that defines an interior cavity and one of the channels separate from the interior cavity.
18. A play yard as defined in claim 11, wherein the enclosure includes first sleeves dimensioned to receive the upper frame and second sleeves dimensioned to receive the lower frame.