CN102839951B - Production tubular column for rhythm oil layer gravity gas drive and method thereof - Google Patents
Production tubular column for rhythm oil layer gravity gas drive and method thereof Download PDFInfo
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- CN102839951B CN102839951B CN201210334461.3A CN201210334461A CN102839951B CN 102839951 B CN102839951 B CN 102839951B CN 201210334461 A CN201210334461 A CN 201210334461A CN 102839951 B CN102839951 B CN 102839951B
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Abstract
The invention discloses a production tubular column for rhythm oil layer gravity gas drive and a method of the production tubular column, and relates to the technical field of oil development and reservoir. The production tubular column is arranged inside an underground oil sleeve and comprises at least one group of low-seepage assemblies, wherein a sealed short circuit is connected on the low-seepage assemblies; a sealing ring is arranged on the upper surfaces of the low-seepage assemblies; the sealing ring is pressed and sealed in the oil sleeve by the sealed short circuit; the upper end of the sealed short circuit is communicated with an exhaust oil tube short circuit; an oil well pump is arranged on the upper end of the exhaust oil tube short circuit; a plurality of exhaust holes are arranged on the side wall of the exhaust oil tube short circuit; and a fluid channel which is communicated with the sealed short circuit is arranged on the upper parts of the low-seepage assemblies. With the adoption of the production tubular column, a gas channelling phenomenon when an individual oil layer injects gas to drive oil can be restrained, so that the gas injection oil driving process is continuously performed, and the production is simultaneously performed in a plurality of oil layers.
Description
Technical field
The present invention relates to the flow string in a kind of oil development oil reservoir technical field, particularly relate to a kind of flow string for rhythm oil reservoir gravity gas drive and method thereof.
Background technology
At present, in field of oil development to the exploitation of rhythm oil reservoir often based on displacement in flooding, its drawback be inject water high permeability formation form passage and seldom involve, low-permeability layer, cause oil reservoir High water cut and inject the invalid situation of water.Prove through great many of experiments and bench-scale testing, gravity gas drive technology contributes to the exploitation of this type of oil reservoir.This gravity gas drive technology is the downward driving utilizing the density contrast of gas and fluid (crude oil and water) to realize gaseous exchange body, thus in effectively employing, low-permeability layer.But when gravity gas drive technology coordinates with existing flow string, have following two main technical barriers:
1, different to permeability multiple oil reservoirs, can only take other layer of shutoff, the way of individual layer exploitation.Conversion producing zone position time, the flow string of cooperation will repeatedly change, down-hole plugging and perforation work frequent.
2, when individual reservoir injection gas displacement, gas channeling phenomenon is still difficult to control.
Above two difficult problems seriously constrain application and the popularization of gravity gas drive technology, the design people is based on being engaged in association area rich experiences for many years and professional knowledge, the application of gravity gas drive technology is actual, actively in addition research and innovation, to overcoming the above-mentioned shortcoming of prior art, a kind of gas channeling phenomenon when can suppress individual reservoir injection gas displacement is provided, injection gas displacement process lasts is carried out, oil gas becomes continuous phase to move, reduce filtrational resistance, produce while can realizing multiple zone, effectively slow down underground work number of times such as changing tubing string, the flow string for rhythm oil reservoir gravity gas drive of enhancing productivity and using method thereof.
Summary of the invention
The object of this invention is to provide a kind of gas channeling phenomenon when can suppress individual reservoir injection gas displacement, make the flow string for rhythm oil reservoir gravity gas drive that injection gas displacement process lasts carries out, multiple zone is produced simultaneously.
Another object of the present invention is to provide a kind of gas channeling phenomenon when can suppress individual reservoir injection gas displacement, makes the production method for rhythm oil reservoir gravity gas drive that injection gas displacement process lasts carries out, multiple zone is produced simultaneously.
For achieving the above object, the present invention proposes a kind of flow string for rhythm oil reservoir gravity gas drive, be arranged in the oil jacket of down-hole, described flow string comprises at least one group of hypotonic column assembly, described hypotonic column assembly is connected with Sealing, described hypotonic column assembly upper surface is provided with sealing ring, described sealing ring is compressed by described Sealing and is plugged in described oil jacket, the upper end of the Sealing on the hypotonic column assembly of well head is connected with exhaust oil pipe short circuit, oil well pump is provided with in described exhaust oil pipe short circuit upper end, the sidewall of described exhaust oil pipe short circuit offers several steam vents, described hypotonic column assembly top offers the fluid passage be connected with described Sealing, the gas mixture in oil reservoir is made to enter to described exhaust oil pipe short circuit via the fluid passage and described Sealing of often organizing described hypotonic column assembly successively from the bottom to top under the effect of gravity gas drive.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, described flow string is provided with hypotonic column assembly described in a group, described hypotonic column assembly comprises: hypotonic cylinder, the periphery wall of described hypotonic cylinder is arranged with the shell with permeability hole, is provided with steel plate at the described upper and lower two ends of hypotonic cylinder; Contiguous block, be flush-mounted in the top of described hypotonic cylinder, offer screw thread groove along described contiguous block upper surface circumference, offer pull bar interface slot in the center of described contiguous block, described fluid passage up/down perforation be opened between described screw thread groove and described pull bar interface slot; Correcting short circuit, the frustum-like shape in up/down perforation, the bottom of described Sealing is inserted on the top of described correcting short circuit, and the bottom of described Sealing is fastened on the outer wall of described correcting short circuit; Pull bar, vertically through described correcting short circuit and described Sealing, the lower end of described pull bar is fixed in the pull bar interface slot of described contiguous block, and the upper end of described pull bar protrudes upward described Sealing top and is provided with the load-bearing ball being locked to this top.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, described flow string comprises described hypotonic column assembly more than two, each group of described hypotonic column assembly is from top to bottom connected together by oil pipe string, described hypotonic column assembly comprises hypotonic cylinder, contiguous block, correcting short circuit and pull bar, wherein, described contiguous block, be flush-mounted in the top of described hypotonic cylinder, screw thread groove is offered along described contiguous block upper surface circumference, pull bar interface slot is offered in the center of described contiguous block, described fluid passage up/down perforation be opened between described screw thread groove and described pull bar interface slot, described correcting short circuit, the frustum-like shape in up/down perforation, the bottom of described Sealing is inserted on the top of described correcting short circuit, and the bottom of described Sealing is fastened on the outer wall of described correcting short circuit, described pull bar, vertically through described correcting short circuit and described Sealing, the lower end of described pull bar is fixed in the pull bar interface slot of described contiguous block, and the upper end of described pull bar protrudes upward described Sealing top and is provided with the load-bearing ball being locked to this top, described hypotonic cylinder comprises the hypotonic cylinder of a bottom and the hypotonic cylinder at least one upper strata, the periphery wall of described hypotonic cylinder is arranged with the shell with permeability hole, steel plate is provided with at the described upper and lower two ends of hypotonic cylinder, upwards holding channel is offered by the bottom center of the hypotonic cylinder in described upper strata, described holding channel is connected with described fluid passage, tube connector is provided with in described holding channel, the sidewall of described tube connector offers seepage flow hole, the lower end of described tube connector is connected with described oil pipe.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, engage place at described correcting short circuit with described Sealing and circumferentially offer bearing groove, in described bearing groove, be provided with bearing, described Sealing coordinates with described bearing element.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, be provided with taper joint in the bottom of described pull bar.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, described Sealing comprises the Sealing body with through chamber and the sealing plate be set in outside described Sealing body, and described sealing ring is compressed by described sealing plate and is plugged in described oil jacket.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, the sidewall of described exhaust oil pipe short circuit offers the described steam vent that two row are crisscross arranged vertically.
As above for the flow string of rhythm oil reservoir gravity gas drive, wherein, the inwall of described exhaust oil pipe short circuit is provided with multiple gas block panel, described gas block panel is fixed on the top on edge on described steam vent and extends in arc bending shape downwards.
Present invention also offers a kind of production method for rhythm oil reservoir gravity gas drive, it is characterized in that, described production method adopts as above for the flow string of rhythm oil reservoir gravity gas drive, and described production method comprises the following steps:
First, select the oil reservoir being applicable to gravity gas drive, and determine gas injection well and producing well;
Underground work is carried out to producing well, bottom-hole cleaning, the middle and upper part of shutoff high permeability formation; Under enter the described flow string for rhythm oil reservoir gravity gas drive;
Hypotonic column assembly and corresponding oil reservoir bottom close contact, the downward crush seal circle of Sealing, makes oil reservoir and flow string form sealing area;
Gas injection well starts gas injection, and the producing well initial stage becomes observation state, when having fluid to exist in oil jacket space, determines whether oily liquid in pipe arrives oil well pump position according to level and casing pressure situation; After reaching standard, producing well work;
According to Liquid output and level information, adjustment rate of pumping;
Produce to pumpingh well do not go out liquid and oil jacket space gases pressure reach predetermined value time, this oil reservoir gas drive stage terminates, more hypotonic column assembly is adjusted to other layer of position.
Compared with prior art, the present invention has following characteristics and advantage:
1, gas channeling phenomenon when the present invention effectively can suppress individual reservoir injection gas displacement, significantly improves the recovery ratio of individual reservoir;
2, flow string of the present invention after manufacture, and injection gas displacement process lasts can be made to carry out, and oil gas becomes continuous seepage state, reduces filtrational resistance; Decreasing and build the pressure and gas lock effect in the formation pore that causes because stopping well, is that later development utilizes and preserves good hole condition.
3, flow string of the present invention can meet the demand that multiple zone is produced simultaneously, effectively slows down underground work number of times such as changing tubing string, enhances productivity.
Accompanying drawing explanation
Accompanying drawing described here only for task of explanation, and is not intended to limit scope disclosed by the invention by any way.In addition, the shape of each parts in figure and proportional sizes etc. are only schematic, for helping the understanding of the present invention, are not the shape and the proportional sizes that specifically limit each parts of the present invention.Those skilled in the art under the teachings of the present invention, can select various possible shape and proportional sizes to implement the present invention as the case may be.
Fig. 1 is the structural representation of the present invention for the embodiment one of the flow string of rhythm oil reservoir gravity gas drive;
Fig. 2 is the structural representation of hypotonic column assembly embodiment one of the present invention;
Fig. 3 is the structural representation with the shell of permeability hole of hypotonic column assembly of the present invention;
Fig. 4 A is the main TV structure schematic diagram of Sealing of the present invention;
Fig. 4 B is the plan structure schematic diagram of Sealing of the present invention;
Fig. 5 A is the main TV structure schematic diagram of contiguous block of the present invention;
Fig. 5 B is the plan structure schematic diagram of contiguous block of the present invention;
Fig. 6 is the structural representation of correcting short circuit of the present invention;
Fig. 7 is the structural representation of pull bar of the present invention;
Fig. 8 A is the main TV structure schematic diagram of bearing of the present invention;
Fig. 8 B is the plan structure schematic diagram of bearing of the present invention;
Fig. 9 A is the main TV structure schematic diagram of exhaust oil pipe short circuit of the present invention;
Fig. 9 B is longitudinal part section structural representation of exhaust oil pipe short circuit of the present invention;
Fig. 9 C is the horizontal section structural representation of exhaust oil pipe short circuit of the present invention;
Figure 10 is the structural representation of the present invention for the embodiment two of the flow string of rhythm oil reservoir gravity gas drive;
Figure 11 is the structural representation of hypotonic column assembly embodiment two of the present invention;
Figure 12 is the structural representation of tube connector of the present invention.
Description of reference numerals:
The hypotonic column assembly of 1-; The hypotonic cylinder of 11-; The hypotonic cylinder of 111-bottom; The hypotonic cylinder in 112-upper strata; 113-holding channel; 114-tube connector; 115-seepage flow hole; 12-contiguous block; 121-screw thread groove; 122-pull bar interface slot; 123-fluid passage; 13-correcting short circuit; 131-bearing groove; 132-bearing; 133-roller; 14-pull bar; 141-load-bearing ball; 142-taper joint; 15-permeability hole; 16-shell; 17-steel plate;
2-Sealing; 21-Sealing body; 22-sealing plate;
3-sealing ring; 4-is vented oil pipe short circuit; 41-steam vent; 42-gas block panel; 5-oil well pump; 6-oil pipe.
Detailed description of the invention
By reference to the accompanying drawings with the description of the specific embodiment of the invention, can clearly understand details of the present invention.But the specific embodiment of the present invention described here, only for explaining object of the present invention, and can not to be understood as by any way be limitation of the present invention.Under the teachings of the present invention, technician can conceive based on distortion possible arbitrarily of the present invention, and these all should be regarded as belonging to scope of the present invention.
The flow string for rhythm oil reservoir gravity gas drive that the present invention proposes, be arranged in the oil jacket of down-hole, this flow string comprises at least one group of hypotonic column assembly, hypotonic column assembly is connected with Sealing, hypotonic column assembly upper surface is provided with sealing ring, sealing ring is compressed by Sealing and is plugged in oil jacket, the upper end of the Sealing on the hypotonic column assembly of well head is connected with exhaust oil pipe short circuit, oil well pump is provided with in exhaust oil pipe short circuit upper end, the sidewall of exhaust oil pipe short circuit offers several steam vents, hypotonic column assembly top offers the fluid passage be connected with Sealing, the gas mixture in oil reservoir is made to enter to exhaust oil pipe short circuit via the fluid passage and Sealing of often organizing hypotonic column assembly successively from the bottom to top under the effect of gravity gas drive, by exhaust oil pipe short circuit Exhaust Gas, oil body is drawn to aboveground by oil well pump, realize rhythm oil reservoir gravity gas drive oil recovery function.
Please refer to Fig. 1, be used for the structural representation of the embodiment one of the flow string of rhythm oil reservoir gravity gas drive for the present invention.As shown in Figure 1, the present embodiment is used for the gravity gas drive of individual layer oil reservoir, the flow string of the present embodiment is provided with one group of hypotonic column assembly 1, hypotonic column assembly 1 is connected with Sealing 2, hypotonic column assembly 1 upper surface is provided with sealing ring 3, and sealing ring 3 is compressed by Sealing 2 and is plugged in oil jacket.In the present embodiment, as shown in Fig. 4 A, 4B, Sealing 2 comprises the Sealing body 21 with through chamber and the sealing plate 22 be set in outside Sealing body 21, and sealing ring 3 is compressed by sealing plate 22 and is plugged in oil jacket.The upper end of the Sealing 2 on the hypotonic column assembly 1 of well head is connected with exhaust oil pipe short circuit 4, oil well pump 5 is provided with in exhaust oil pipe short circuit 4 upper end, the sidewall of exhaust oil pipe short circuit 4 offers several steam vents 41, hypotonic column assembly 1 top offers the fluid passage 123 be connected with Sealing 2, the gas mixture in oil reservoir is made to enter to exhaust oil pipe short circuit 4 via the fluid passage and Sealing 2 of often organizing hypotonic column assembly 1 successively from the bottom to top under the effect of gravity gas drive, by exhaust oil pipe short circuit 4 Exhaust Gas, oil body is drawn to aboveground by oil well pump 5.Please refer to Fig. 2 to Fig. 7, be respectively the structural representation of hypotonic column assembly embodiment one of the present invention, the structural representation of shell, the master of Sealing depending on looking the structural representation with plan structure schematic diagram, correcting short circuit and the structural representation of pull bar with the master of plan structure schematic diagram, contiguous block.As shown in the figure, hypotonic column assembly 1 comprises: hypotonic cylinder 11, contiguous block 12, correcting short circuit 13 and pull bar 14, wherein: as shown in Figure 2,3, hypotonic cylinder 11 is in cylindric, the periphery wall of hypotonic cylinder 11 is arranged with the shell 16 with permeability hole 15, down-hole oil gas fluid-mixing is entered in hypotonic cylinder 11 by the permeability hole 15 of shell 16 under the effect of gravity gas drive.Comparatively oil reservoir is low for the permeability rank of hypotonic cylinder 11, and gas drive filtrational resistance is greater than inside, stratum.Be provided with steel plate 17 at hypotonic cylinder about 11 two ends, play load-bearing and stop fluid to enter the effect in oil jacket space, top via hypotonic cylinder 11 upper surface.
As shown in Fig. 5 A, 5B, contiguous block 12 is steel material, is flush-mounted in the groove at hypotonic cylinder 11 top, screw thread groove 121 is offered along contiguous block 12 upper surface circumference, for connecting correcting short circuit 13, offer pull bar interface slot 122 in the center of contiguous block 12, for cylinder lever connecting rod 14.Being opened between screw thread groove 121 and pull bar interface slot 122 of fluid passage 123 up/down perforation, makes fluid infiltrate in correcting short circuit 13 via fluid passage 123, then enters to Sealing 2 and the exhaust oil pipe short circuit 4 of top by correcting short circuit 13.
As shown in Figure 6, the frustum-like shape of correcting short circuit 13 in up/down perforation, plays effect top oil pipe 6 or exhaust oil pipe short circuit 4 are accurately located by connecting with contiguous block 12.The bottom of Sealing 2 is inserted on the top of correcting short circuit 13, and correcting short circuit 13 is connected with Sealing 2; The lower end of correcting short circuit 13 is threaded with the screw thread groove 121 of contiguous block 12, and correcting short circuit 13 is erected on contiguous block 12.The bottom of Sealing 2 is fastened on the outer wall of correcting short circuit 13, when Sealing 2 is stressed press down time, the outer wall along correcting short circuit 13 is descending, thus press seal circle 3, makes sealing ring 3 be out of shape reservoir plugging and is communicated with oil pipe top.Formation fluid can only flow through hypotonic cylinder 11 by oil reservoir bottom, just can enter oil pipe inside.
Please also refer to Fig. 2 and Fig. 7, pull bar 14 runs through correcting short circuit 13 and Sealing 2 vertically, the lower end of pull bar 14 is fixed in the pull bar interface slot 122 of contiguous block 12, the upper end of pull bar 14 protrudes upward Sealing 2 top and is provided with the load-bearing ball 141 being locked to this top, during upper lifting pipe post, load-bearing ball 141 is stuck on packoff nipple 2, pull bar 14 can be driven on hypotonic column assembly 1 and carry, and play a part to bear bottom tubing string weight.Further, be provided with taper joint 142 in the bottom of pull bar 14, taper joint 142 matches with the pull bar interface slot 122 of contiguous block 12, to ensure the fastness be connected between pull bar 14 with contiguous block 12.
As shown in Fig. 6,8A, 8B, engage place and circumferentially offer bearing groove 131, be provided with bearing 132 in bearing groove 131 at correcting short circuit 13 with Sealing 2, the inwall of Sealing 2 rolls with bearing 132 and coordinates.In the present embodiment, bearing 132 is roller bearing, and this roller bearing 132 has been uniformly distributed circumferentially multiple roller 133, can certainly adopt other suitable rolling bearing.Bearing groove 131 blocks bearing 132, the effect of bearing 132 be packoff nipple 2 through rotating downward crush seal circle 3 time, reduce the frictional force between packoff nipple 2 and correcting short circuit 13, guarantee sealing ring 3 crimp, consistent seal.
Please refer to Fig. 9 A, 9B, 9C, as shown in the figure, in order to ensure that gas discharges flow string smoothly, the sidewall of exhaust oil pipe short circuit 4 offering the steam vent 41 that two row are crisscross arranged vertically.Wherein, be spaced apart 20cm between two often adjacent in row steam vent steam vents 41, the central horizontal axis of steam vent 41 corresponding in two row steam vents 41 is at a distance of 5cm, and the aperture of steam vent 41 is 5cm ~ 7cm.
Further, as shown in Fig. 9 A, 9B, 9C, the inwall of exhaust oil pipe short circuit 4 is provided with multiple gas block panel 42, and gas block panel 42 is fixed on the top on edge on steam vent 41 and extends in arc bending shape downwards.When fluid flows into after exhaust tubing nipple 4 in hypotonic cylinder 11, gas is separated under gravity, and the portion gas near exhaust oil pipe short circuit 4 tube wall enters oil jacket space by steam vent 41; Another part gas is then stopped by the gas block panel 42 distributed up and down and guides to oil jacket space, makes the fluid in the oil pipe of top be liquid like this, ensures the operating efficiency of oil well pump.
As another optional embodiment of the present invention, please refer to Figure 10, be used for the structural representation of the embodiment two of the flow string of rhythm oil reservoir gravity gas drive for the present invention.As shown in Figure 10, the present invention is used for the hypotonic column assembly 1 that the flow string of rhythm oil reservoir gravity gas drive comprises (comprising two groups) more than two, each group of hypotonic column assembly 1 is from top to bottom serially connected by oil pipe 6, for carrying out the production operation of gravity gas drive to multilayer oil reservoir simultaneously.Hypotonic column assembly in the present embodiment is substantially identical with the hypotonic column assembly structure of embodiment one, its difference is only, hypotonic cylinder 11 comprises the hypotonic cylinder of a bottom 111 and the hypotonic cylinder 112 at least one upper strata, the hypotonic cylinder of bottom 111 is different from the permeability of the hypotonic cylinder in upper strata 112, and the permeability of usual hypotonic cylinder is successively decrease successively by upper strata to lower floor.The hypotonic cylinder of bottom 111 is identical with the structure of the hypotonic cylinder 11 of embodiment one, be the hypotonic cylinder of solid (band pore structure), and as shown in figure 11, holding channel 113 is upwards offered by the bottom center of the hypotonic cylinder 112 in upper strata, this holding channel 113 is connected with fluid passage 123, tube connector 114 is provided with in holding channel 113, as shown in figure 12, the sidewall of tube connector 114 offers seepage flow hole 115, the fluid of this oil reservoir is made to flow in tube connector 114 through seepage flow hole 115, the lower end of tube connector 114 is connected with oil pipe 6, the fluid in lower floor's oil reservoir is made to enter tube connector 114 through the lower port of oil pipe 6 and tube connector 114, flow into the fluid passage 123 of upper end by tube connector 114 again and upwards flow.Like this, the fluid of each oil reservoir is collected to exhaust oil pipe short circuit 4 carries out Oil-gas Separation through the hypotonic column assembly 1 of each layer correspondence, Sealing 2, oil pipe 6, by oil well pump 5, liquid is extracted out again, thus produce while achieving multiple zone, effectively slow down underground work number of times such as changing tubing string, enhance productivity.
Operating principle of the present invention is: by the shutoff of individual layer middle and upper part, at the hypotonic column assembly that individual layer lower contacts permeability rank is lower, hypotonic column assembly is simulation rock tubing string, the core of simulation rock tubing string is hypotonic post, mainly comprise outer wall and inner hypotonic cylinder, the steel plate 17 that outer wall is arranged by the cylindrical tube shell 16 with eyelet and upper bottom surface forms, and bottom surface is sealing plectane, and upper bottom surface is connected with contiguous block 12.In shell 16, filling low permeability media forms fine and close hypotonic cylinder 11.Hypotonic is for the stratum that this tubing string is applied, and suppose that in-place permeability is 500md, then hypotonic cylinder design is 200md, and this ratio needs to formulate according to actual conditions.Filling material can by true rock, quartz sandstone is cementing forms, manufacturing process comprises: charges mix with glue, suppress, test etc.The hypotonic cylinder made and outer wall are combined closely, and fluid does not flow along inside outer wall.Formation oil along bottom hole, enters in oil pipe through simulation rock tubing string under injected gas pressure.Because the permeability of simulation rock tubing string is low, thus injected gas is assembled in individual layer, forms the pneumatic jack to pressing down, and is promoted not involving crude oil in a large number by bottom to flow string direction.The shutoff of the present invention middle and upper part of individual layer, thus inhibits gas in the has channeling of top of oil horizon; Be provided with hypotonic column assembly in bottom, not only ensure that the continuity of whole gas drive process, also inhibits the has channeling of bottom.Further, flow string of the present invention adopts cascaded structure can use at multiple oil reservoir simultaneously, produces while thus can realizing multiple zone, effectively slows down underground work number of times such as changing tubing string, enhances productivity.In addition, the present invention is provided with exhaust tubing nipple 4 in the superiors, is discharged to outside tubing string by the gas of output, ensures the full liquid working state of oil well pump 5, improves the pumping efficiency of oil well pump 5.Gas enters oil jacket space, is convenient to the pressure monitoring on ground, and provides guidance for analyzing reservoir exploitation situation and timely Correctional tube column state.
Present invention also offers a kind of production method for rhythm oil reservoir gravity gas drive, this production method adopts as above for the flow string of rhythm oil reservoir gravity gas drive, and this production method comprises the following steps:
First, select the oil reservoir being applicable to gravity gas drive, and determine gas injection well and producing well;
Underground work is carried out to producing well, bottom-hole cleaning, the middle and upper part of shutoff high permeability formation; Under enter the described flow string for rhythm oil reservoir gravity gas drive;
Hypotonic column assembly and corresponding oil reservoir bottom close contact, the downward crush seal circle of Sealing, makes oil reservoir and flow string form sealing area;
Gas injection well starts gas injection, and the producing well initial stage becomes observation state, when having fluid to exist in oil jacket space, determines whether oily liquid in pipe arrives oil well pump position according to level and casing pressure situation; After reaching standard, producing well work;
Now oil reservoir inner fluid flow event is as follows: injected gas under gravity, is assembled on high permeability formation top, drives formation oil and formation water downwards, and profit enters in oil pipe by oil well pump output; After exploitation a period of time, gas progressively moves down, and when leading edge gas is along bottom hole, when hypotonic flow string enters in oil pipe, hypotonic flow string needs larger pressure reduction on the one hand, thus suppresses the has channeling of bottom, makes gas continue to assemble the displacement of reservoir oil on top.On the other hand, portion gas enters flow string, but enters oil jacket space at exhaust oil pipe short circuit place, continues the normal operating efficiency keeping oil well pump.When gas flow comparatively large (casing pressure is higher), can be reduced pressure with getter body by sleeve valve.
According to Liquid output and level information, adjustment rate of pumping;
Produce to pumpingh well do not go out liquid and oil jacket space gases pressure reach predetermined value time, this oil reservoir gas drive stage terminates, more hypotonic column assembly is adjusted to other layer of position.
For multiple oil reservoir, can carry out the series connection of packoff nipple and hypotonic column assembly, operating process complexity increases.But be the reduction of the replacement of producing oil layer, the corresponding underground work number of times such as changing tubing string that decreases, effectively improves oil recovery efficiency.
The present invention is used for the flow string of rhythm oil reservoir gravity gas drive, shows in laboratory with conventional development approach comparing result, and the average recovery ratio amplitude that improves is more than 30%.
Specific experiment process is as follows:
Experiment condition: the quartz sand selecting three class particle diameters, has made the rhythm sandpack column of rectangle, selects certain well degassed crude and formation water, and injected gas is pure CO
2gas.Experimental temperature 50 DEG C, pressure 10MPa.Adopt crestal gas injection, the mode of bottom exploitation.
Experimental result: the ultimate recovery of conventional development approach is 13.8%, and adopts the method ultimate recovery of flow string of the present invention to be 56.4%.
Experimental analysis: conventional gas drive method production curve display gas channeling phenomenon is obvious, when 0.3PV, forms has channeling passage, a large amount of extraction of injected gas, and profit no longer extraction.Adopt method of the present invention then significantly to promote recovery percent of reserves, curve table reveals three phases, and early stage in each stage, recovery ratio increased fast, and amplification reduces afterwards; Significantly promote again after a period of time.This feature instantiation gas accumulation process in single oil reservoir.Also illustrate that the design of flow string of the present invention can give full play to the feature that gas more easily enters micro-pore, realizes the raising of recovery ratio.
For the detailed explanation of the respective embodiments described above, its object is only to make an explanation to the present invention, so that the present invention can be understood better, but, it is limitation of the present invention that these descriptions can not become with any explanation, particularly, each feature described in various embodiments also can be combined mutually, thus form other embodiments, except there being clearly contrary description, these features should be understood to can be applied in any one embodiment, and are also not only confined to described embodiment.
Claims (8)
1. the flow string for rhythm oil reservoir gravity gas drive, be arranged in the oil jacket of down-hole, it is characterized in that, described flow string comprises at least one group of hypotonic column assembly, described hypotonic column assembly is connected with Sealing, described hypotonic column assembly upper surface is provided with sealing ring, described sealing ring is compressed by described Sealing and is plugged in described oil jacket, the upper end of the Sealing on the hypotonic column assembly of well head is connected with exhaust oil pipe short circuit, oil well pump is provided with in described exhaust oil pipe short circuit upper end, the sidewall of described exhaust oil pipe short circuit offers several steam vents, described hypotonic column assembly top offers the fluid passage be connected with described Sealing, the gas mixture in oil reservoir is made to enter to described exhaust oil pipe short circuit via the fluid passage and described Sealing of often organizing described hypotonic column assembly successively from the bottom to top under the effect of gravity gas drive,
Described flow string is provided with hypotonic column assembly described in a group, and described hypotonic column assembly comprises:
Hypotonic cylinder, the periphery wall of described hypotonic cylinder is arranged with the shell with permeability hole, is provided with steel plate at the described upper and lower two ends of hypotonic cylinder;
Contiguous block, be flush-mounted in the top of described hypotonic cylinder, offer screw thread groove along described contiguous block upper surface circumference, offer pull bar interface slot in the center of described contiguous block, described fluid passage up/down perforation be opened between described screw thread groove and described pull bar interface slot;
Correcting short circuit, the frustum-like shape in up/down perforation, the bottom of described Sealing is inserted on the top of described correcting short circuit, and the bottom of described Sealing is fastened on the outer wall of described correcting short circuit;
Pull bar, vertically through described correcting short circuit and described Sealing, the lower end of described pull bar is fixed in the pull bar interface slot of described contiguous block, and the upper end of described pull bar protrudes upward described Sealing top and is provided with the load-bearing ball being locked to this top.
2. as claimed in claim 1 for the flow string of rhythm oil reservoir gravity gas drive, it is characterized in that, engage place at described correcting short circuit with described Sealing and circumferentially offer bearing groove, in described bearing groove, be provided with bearing, described Sealing coordinates with described bearing element is dynamic.
3., as claimed in claim 2 for the flow string of rhythm oil reservoir gravity gas drive, it is characterized in that, described bearing is roller bearing.
4., as claimed in claim 1 for the flow string of rhythm oil reservoir gravity gas drive, it is characterized in that, be provided with taper joint in the bottom of described pull bar.
5. as claimed in claim 1 for the flow string of rhythm oil reservoir gravity gas drive, it is characterized in that, described Sealing comprises the Sealing body with through chamber and the sealing plate be set in outside described Sealing body, and described sealing ring is compressed by described sealing plate and is plugged in described oil jacket.
6., as claimed in claim 1 for the flow string of rhythm oil reservoir gravity gas drive, it is characterized in that, the sidewall of described exhaust oil pipe short circuit offers the described steam vent that two row are crisscross arranged vertically.
7. as claimed in claim 6 for the flow string of rhythm oil reservoir gravity gas drive, it is characterized in that, the inwall of described exhaust oil pipe short circuit is provided with multiple gas block panel, described gas block panel is fixed on the top on edge on described steam vent and extends in arc bending shape downwards.
8. for a production method for rhythm oil reservoir gravity gas drive, it is characterized in that, described production method adopts the flow string for rhythm oil reservoir gravity gas drive according to any one of claim 1 to 7, and described production method comprises the following steps:
First, select the oil reservoir being applicable to gravity gas drive, and determine gas injection well and producing well;
Underground work is carried out to producing well, bottom-hole cleaning, the middle and upper part of shutoff high permeability formation; Under enter the described flow string for rhythm oil reservoir gravity gas drive;
Hypotonic column assembly and corresponding oil reservoir bottom close contact, the downward crush seal circle of Sealing, makes oil reservoir and flow string form sealing area;
Gas injection well starts gas injection, and the producing well initial stage becomes observation state, when having fluid to exist in oil jacket space, determines whether oily liquid in pipe arrives oil well pump position according to level and casing pressure situation; After reaching standard, producing well work;
According to Liquid output and level information, adjustment rate of pumping;
Produce to pumpingh well do not go out liquid and oil jacket space gases pressure reach predetermined value time, this oil reservoir gas drive stage terminates, more hypotonic column assembly is adjusted to other layer of position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210334461.3A CN102839951B (en) | 2012-09-11 | 2012-09-11 | Production tubular column for rhythm oil layer gravity gas drive and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210334461.3A CN102839951B (en) | 2012-09-11 | 2012-09-11 | Production tubular column for rhythm oil layer gravity gas drive and method thereof |
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| CN101078341A (en) * | 2007-05-25 | 2007-11-28 | 冯永胜 | Oil gas water well open hole filling sand prevention completion method and tool |
| CN201460856U (en) * | 2009-08-12 | 2010-05-12 | 苗在朝 | Combined gas and sand anchor |
| CN202832435U (en) * | 2012-09-11 | 2013-03-27 | 中国石油天然气股份有限公司 | Production tubular column used for rhythm oil layer gravity gas drive |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101078341A (en) * | 2007-05-25 | 2007-11-28 | 冯永胜 | Oil gas water well open hole filling sand prevention completion method and tool |
| CN201460856U (en) * | 2009-08-12 | 2010-05-12 | 苗在朝 | Combined gas and sand anchor |
| CN202832435U (en) * | 2012-09-11 | 2013-03-27 | 中国石油天然气股份有限公司 | Production tubular column used for rhythm oil layer gravity gas drive |
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