CN201363112Y

CN201363112Y - Well cleaning and inflating integrated device used for screen tube sublevel well completion

Info

Publication number: CN201363112Y
Application number: CNU200920144470XU
Authority: CN
Inventors: 王绍先; 彭志刚; 杨海波; 冯德杰; 李文才; 徐鑫; 吴柳根
Original assignee: Drilling Technology Research Institute of Sinopec Shengli Petroleum Administration Bureau
Current assignee: Sinopec Oilfield Service Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Priority date: 2009-02-23
Filing date: 2009-02-23
Publication date: 2009-12-16
Anticipated expiration: 2019-02-23

Abstract

A well cleaning and inflating integrated device used for a screen tube sublevel well completion comprises an inner group of tubular column system and an outer group of tubular column system. The outer tubular column consists of a screen tube, a sleeve, an external casing packer and a well cleaning valve, wherein the well cleaning valve is at the lower end of the outer tubular column. The inner tubular column consists of internal casing inflating tools, a pressure limiting valve, a well cleaning packer, a ball seat, a central tube and a sealing plug, wherein the well cleaning packer is arranged in the screen tube, the internal casing inflating tool is arranged in the sleeve and at two ends of the external casing packer, the pressure limiting valve is arranged the internal casing inflating tools and the ball seat is arranged at the lower end of the internal casing inflating tool. Matched with the well cleaning valve, the sealing plug is communicated with a well cleaning channel to conduct counter-circulation well cleaning, positively press and inflate the external casing packer and realize the integrated well cleaning and inflating of the screen tube sublevel well completion. The integrated device has the advantages of realizing oil layer acid washing plugging removal and sublevel mining by adopting the integrated design of the well cleaning and inflating of the external casing packer, being capable of effectively controlling and deferring bottom water coning and providing preconditions for the realization of intelligent well completion oil production in later period.

Description

The well-flushing that is used for screen casing segmentation completion expands and seals integrated apparatus

Technical field

The utility model is a kind of bloated envelope of well-flushing integrated apparatus that is used for screen casing segmentation completion, belongs to the natural petroleum gas field field, can realize the purpose of oil reservoir composite blockage relieving and segmentation exploitation simultaneously, thereby delay bottom water coning effectively.

Background technology

For fully exposed oil reservoir, enlarge drainage area, horizontal well, high angle hole are used more and more widely in oil field development.Because sieve tube completion can provide enough circulation areas, reservoir is not subjected to the pollution of cement paste, simultaneously can prevent borehole collapse, thus at present both at home and abroad horizontal well, that high angle hole is used sieve tube completion is very general, uses screen casing crest water flooding mud completion mode as the horizontal well of Canada 70%.But when present level well, high angle hole adopted sieve tube completion, whole horizontal segment was developed as series of strata, thus unavoidably face in producing be difficult to carry out the later stage reservoir reconstruction, horizontal segment shifts to an earlier date problems such as water logging.

In fact horizontal segment tends to pass through a plurality of oil reservoirs, or has the segment interlayer, just requires the segmentation exploitation in order to develop better; Simultaneously, when reservoir nature production capacity is depleted, often need to carry out well stimulations such as acid fracturing, also require the horizontal screen pipeline section is carried out segmentation this moment.Adopt screen casing segmentation completion, can effectively alleviate water logging and bottom water coning, prolong the anhydrous or low moisture oil recovery phase, for the measure of horizontal well later development provides condition.

Summary of the invention

The purpose of this utility model is: provide a kind of well-flushing that is used for screen casing segmentation completion to expand to the scene and seal integrated apparatus, adopt integrated pipe column to carry out oil reservoir composite blockage relieving and the bloated envelope of external packer of pipe, realize oil reservoir pickling de-plugging and segmentation exploitation, and then delay bottom water coning.

The well-flushing that is used for screen casing segmentation completion described in the utility model expands and seals integrated apparatus, comprise outer tubing string of forming by screen casing, sleeve pipe, external packer of pipe and flushing valve and two groups of tubular column systems of interior tubing string of forming by expand in the pipe envelope instrument, pressure limiting valve, flushing packer, ball seat, central tube and sealing plug, the interior envelope instrument that expands of described pipe can be the interior packer of pipe of bloated envelope forms such as bloated envelope of the formula of suppressing and the bloated envelope of leather cup formula, and flushing valve comprises sealing device and valve body with holes.External packer of pipe is connected between the sleeve pipe on the outer tubing string, and sleeve pipe and screen casing make up by over-over mode, and flushing valve is positioned at outer tubing string lower end; For interior tubing string, bloated envelope instrument, pressure limiting valve, ball seat and sealing plug all are connected on the central tube in flushing packer, the pipe, flushing packer is distributed in sieve tube segment, the envelope instrument that expands in the pipe is positioned at sleeve pipe and is in the external packer of pipe two ends, pressure limiting valve expands between the envelope instrument in pipe, ball seat is positioned at the bloated envelope instrument lower end of pipe, and sealing plug is in interior tubing string lowermost end, cooperates with flushing valve during well-flushing.

After interior tubing string G.I.H put in place, the flushing valve on sealing plug on the interior tubing string and the outer tubing string cooperated, and formed the well-flushing passage, anti-circulation well cleanup, after well-flushing is finished, just suppress, ball seat is closed again, in interior tubing string, form pressure, the envelope instrument that expands in the pipe is realized being honored as a queen from expanding, and pressure limiting valve is opened, and liquid enters the bloated envelope space of external packer of pipe by pressure limiting valve, and then bloated tube sealing external packer, thereby realize the integrated well-flushing of screen casing segmentation completion and the envelope that expands.

Advantage of the present utility model is:

1, well-flushing and external packer of pipe expand and seal integrated design, and anti-circulation well cleanup just being suppressed the envelope that expands, and realize oil reservoir pickling de-plugging and segmentation exploitation, and be simple in structure, easy to operate, can reduce the engineering time.

2, screen casing on the outer tubing string and sleeve pipe can be optimized completion tubular column according to the actual independent assortment that requires, and oil reservoir is carried out the segmentation exploitation, realize rationalizing and recover the oil.

3, the utility model can be adjusted the quantity of flushing packer, realizes multistage supercharging well-flushing, has increased the flow resistance of flushing fluid in inner and outer pipes band of column space, and the restriction flushing fluid has effectively improved the well-flushing ability as far as possible along flowing in the borehole wall and the screen casing annular space.

4, the utility model has been realized the screen casing segmentation completion of oil layer section, can be successively or carry out the bloated envelope of multi units tube external packer simultaneously, can effectively control and delay bottom water coning, for the later stage realizes that intelligent completion is recovered the oil precondition is provided.

Description of drawings

Fig. 1 structural representation of the present utility model

Fig. 2 seals the bloated seal apparatus schematic diagram of well-flushing for the leather cup formula expands

Well-flushing access diagram during Fig. 3 the utility model well-flushing

Fig. 4 is the structural representation of the bloated sealed packer of leather cup formula

1. screen casing 2. sleeve pipes 3. external packer of pipe 4. flushing valves 5. sealing devices 6. valve body 7. flushing packers 8. sealing plugs 9. well-flushing path 10s with holes. envelope instrument 11. pressure limiting valves 12. ball seats 13. that expand in pipe packer 16. topping up holes 17. bidirectional high-pressure sealing cups, 18. current by pass in 14. central tubes, the 15. leather cup formula pipes of envelope space that expand

The specific embodiment

Now the utility model will be further described in conjunction with Figure of description.

As Fig. 1, shown in Figure 2, the well-flushing that is used for screen casing segmentation completion described in the utility model expands and seals integrated apparatus, comprise two groups of tubular column systems compositions of outer tubing string and interior tubing string, outer tubing string comprises screen casing 1, sleeve pipe 2, external packer of pipe 3 and flushing valve 4 etc., and interior tubing string is by flushing packer 7, envelope instrument 10 expands in the pipe, pressure limiting valve 11, ball seat 12, central tube 14 and sealing plug 8 are formed, wherein flushing valve 4 comprises sealing device 5 and valve body with holes 6, and the envelope instrument 10 that expands in the described pipe comprises and suppresses in the formula pipe in the packer and leather cup formula pipe packer 15 etc. according to the difference envelope form that expands.

For outer tubular column system, sleeve pipe 2 and screen casing 1 are by the over-over mode combination, and sleeve pipe 2 and screen casing 1 length can be adjusted according to actual conditions, and external packer of pipe 3 is positioned at sleeve pipe 2 two ends, and guarantee that external packer of pipe 3 two ends are connected with 5-10m sleeve pipe 2 at least, seal to guarantee that external packer of pipe 3 safety expand; Flushing valve 4 is positioned at outer tubing string lower end; For interior tubular column system, bloated envelope instrument 10, pressure limiting valve 11, ball seat 12 and sealing plug 8 all are connected on the central tube 14 in flushing packer 7, the pipe, flushing packer 7 is distributed in 1 section in screen casing, the envelope instrument 10 that expands in the pipe is positioned at the sleeve pipe 2 at external packer of pipe 3 two ends, pressure limiting valve 11 expands between the envelope instrument 10 in pipe, ball seat 12 is positioned at bloated envelope instrument 10 lower ends of pipe, and sealing plug 8 is in interior tubing string lowermost end.

As Fig. 1, Fig. 2, shown in Figure 3, the sealing device 5 of flushing valve 4 is the one-way sealing structure, and flushing packer 7 adopts one-way sealing leather cup structure, and sealing cup and outer tubing string interference fit are in impaction state all the time during well-flushing, guarantee the sealing of flushing packer.Between the inside and outside tubing string and screen casing 1 all have annular space with well, sealing plug 8 and be with empty valve body 6 to be provided with through hole, when interior tubing string be lowered to put in place after, the sealing device 5 of sealing plug 8 and flushing valve 4 cooperates, and is communicated with well-flushing passage 9.During anti-circulation well cleanup, ball seat 12 is in opening, since the sealing function of flushing packer 7, the annular space of annular space, screen casing and the well of tubing string inside and outside flushing fluid is flowed through successively, by being with empty valve body 6 and sealing plug 8 to enter interior tubing string, finish clean-out service along well-flushing passage 9.In order to strengthen well washing effect, prevent that flushing fluid from being serpentine from the annular space of inside and outside tubing string and flowing, can suitably adjust the quantity of flushing packer 7, form multistage supercharging technology for washing well, increased the flow resistance of flushing fluid in inner and outer pipes band of column space, the restriction flushing fluid has effectively improved the well-flushing ability as far as possible along flowing in the borehole wall and the screen casing annular space.

Envelope instrument 10 can be to suppress formula envelope and the leather cup formula packer in the pipe of bloated envelope forms such as envelope that expands that expands owing to expand in the pipe, so also respectively has the similarities and differences, the present invention to provide the specific embodiment of the bloated envelope form of two kinds of differences to the bloated envelope mode of external packer of pipe 3.

Embodiment 1, and as shown in Figure 1, the envelope instrument 10 that expands in the pipe among the figure is for suppressing packer in the formula pipe, after well-flushing is finished, just suppress, ball seat 12 is in closed condition, the 7-8MPa that builds the pressure, stamping expansion sealed type packer realize building the pressure to 10-11MPa from the envelope that expands again, pressure limiting valve 11 is opened, and liquid enters the bloated envelope space 13 of external packer of pipe 3, and then the bloated tube sealing external packer 3 of 12MPa voltage stabilizing, continue to suppress to 18-20MPa, suppress logical ball seat 12, the stamping expansion sealed type packer restores to the original state, trip out interior tubing string at last, completion.

Embodiment 2, and as Fig. 2, shown in Figure 4, packer 15 adopts many group bidirectional high-pressure sealing cup 17 structures in the leather cup formula pipe, because leather cup 17 the rims of a bowl are relative, and be in the interference impaction state all the time, under high pressure still can realize sealing, so pressure limiting valve 11 can be reduced to topping up hole 16.During well-flushing, cup packer 15 also can serve as flushing packer 7, stops liquid stream to flow in sleeve pipe 2.When expanding tube sealing external packer 3,, just suppress by the mode of leather cup 17 covering external packer of pipe 3, ball seat 12 is closed, form pressure in interior tubing string, liquid enters the envelope space 13 of expanding from the topping up hole, and leather cup 17 expands and seals, suppress to 12MPa, the voltage stabilizing tube sealing external packer 3 that expands continues to suppress to 18-20MPa, suppresses logical ball seat 12, trip out interior tubing string at last, completion.Cup packer 15 adopts double-deck inner tube structure, is provided with current by pass 18 between the double-deck interior pipe, pulls out the piston accident when preventing lift pipe string.

The utility model adopts well-flushing and external packer of pipe 3 to expand and seals integrated design, can optimize completion tubular column, realize oil reservoir pickling de-plugging and segmentation exploitation, thereby effectively control and delay bottom water coning, for the later stage realizes that oil formation improvement and intelligent completion are recovered the oil precondition is provided.

Claims

1, a kind of well-flushing that is used for screen casing segmentation completion expands and seals integrated apparatus, it is characterized in that: comprise inside and outside two groups of tubular column systems, outer tubing string is made up of screen casing 1, sleeve pipe 2, external packer of pipe 3 and flushing valve 4, and interior tubing string is made up of expand in the pipe envelope instrument 10, pressure limiting valve 11, flushing packer 7, ball seat 12, central tube 14 and sealing plug 8; Outer tubing string top sieve pipe 1 and sleeve pipe 2 alternate combinations, external packer of pipe 3 is connected between the sleeve pipe 2, and flushing valve 4 is positioned at outer tubing string lower end, has sealing device 5 and valve body with holes 6; For interior tubing string, flushing packer 7 is evenly distributed in the screen casing 1, the envelope instrument 10 that expands in the pipe is positioned at external packer of pipe 3 two ends, pressure limiting valve 11 expands between the envelope instrument 10 in pipe, ball seat 12 is positioned at bloated envelope instrument 10 lower ends of pipe, the tubing string lowermost end cooperated with flushing valve 4 in sealing plug 8 was in, and was communicated with well-flushing passage 9.

2, the well-flushing that is used for screen casing segmentation completion as claimed in claim 1 expands and seals integrated apparatus, it is characterized in that: screen casing 1 and sleeve pipe 2 are by the alternate combinations mode, and external packer of pipe 3 two ends are connected with sleeve pipe 2, and splicing sleeve 2 between the external packer of pipe 3.

3, the well-flushing that is used for screen casing segmentation completion as claimed in claim 1 expands and seals integrated apparatus, and it is characterized in that: flushing packer 7 is positioned at screen casing 1 inside, adopts one-way sealing leather cup structure, interference fit.

4, the completion well-flushing that is used for the screen casing segmentation as claimed in claim 1 expands and seals integrated apparatus, it is characterized in that: the envelope instrument 10 that expands in the pipe is positioned at sleeve pipe 2 and is in external packer of pipe 3 two ends, and the interior packer 15 of packer or leather cup formula pipe is on the sleeve pipe 2 at external packer of pipe 3 two ends in the compression pipe.

5, packer in the leather cup formula pipe as claimed in claim 4 is characterized in that: packer 15 adopts bimetallic tube and bidirectional high-pressure sealing cup 17 structures in the leather cup formula pipe, is provided with current by pass 18.