CN2156283Y - Positioning flow limited press crack sealing and insulator - Google Patents

Abstract

The utility model relates to a flow limited press crack sealing and insulating device, which solves the technical problem how the conventional high-density perforating well conducts the pressing crack through adopting the flow limited method. The utility model is characterized in that according to the requirements of the oil layer thickness and the oil layer reforming, the flow limited press crack sealing and insulating device can assemble the sealing and insulating components with different quantities and different lengths; the flow limited press crack sealing and insulating device can not only seal and insulate the stratum, but also can coat the non-imbibing blast hole of the target layer, and the flow limited press crack sealing and insulating device is provided with sand blasting components. The flow limited press crack sealing and insulating device is suitable for the thick oil layer of the anisotropic water flooding of the conventional high-density perforating well of the anisotropic sandstone oil field; the low water-containing position of the interlayer containing stable physical property is cracked and dug, and the flow limited press crack sealing and insulating device can be used for the pressing crack reforming of a plurality of hyposmosis thin oil layers which are adjacent to the thick oil layer of the water flooding and have the thinner interlayer.

Description

Positioning flow limited press crack sealing and insulator

The utility model relates to the downhole tool that a kind of oil field compression fracture is used, and is called location current limliting pressure break packer.

In the construction of oil field oil, well fracturing, each absorbs of the fracturing fluid borehole and all is equivalent to a throttling and chews, when borehole quantity one regularly, discharge capacity is big more, frictional resistance is big more.

The transformation of limited entry fracture treatment completion is that a cover is than mature technique, it is the low-density perforation by strictness, high as far as possible operational discharge capacity, utilize and pressed off the borehole frictional resistance that produces when layer absorbs fracturing fluid at first, increase substantially bottom pressure, and then force the fracturing fluid shunting, other near layer of crimping is pressed off in succession, reach and once add sand, can handle several layers purpose simultaneously.

And conventional perforated hole, shot density height, every meter 10 hole or 12 holes, flow rate of liquid by borehole is little, bottom pressure can be because of the borehole influence on frictional obviously raise, and therefore an independent layer can absorb whole fracturing fluids, generally once adds sand and only handles a layer.

Present current limliting fracturing reform to conventional perforated hole, external earlier with grout off perforation borehole, and then by strict low-density perforation, adopt the method for current limliting pressure break to transform less permeable layer, this method construction is complicated, the cost height, easily cause oil layer pollution, and behind the cemented up, also must bore cement plug, easily damage sleeve pipe.

Domestic well to conventional high density pattern perforation generally all uses conventional pressure break and wax ball diverting agent multiple cracking fracturing process to carry out oil formation improvement, and interlayer is greater than 3 meters between these two kinds of methods requirement target zones.Conventional pressure break generally once adds sand and can only handle one deck; Though wax ball diverting agent multiple cracking fracturing process can produce many cracks, is difficult to control the into treatment sites and the intensity of target zone, when interlayer between target zone and high aquifer is thin, press string easily.Above method all be difficult at oil bearing formation property selectively, the fracturing reform low permeability pay of varying strength, also be difficult to protect the short lap between the target zone.

Deficiency at above-mentioned prior art, the purpose of this utility model is to provide a kind of heterogeneous body sandstone oil field, the location current limliting pressure break packer of the oil of perforation, well fracturing transformation usefulness routinely, it is applicable to the heterogeneous body sandstone oil field, in the heterogeneous body water logging thick oil pay of conventional high density pattern perforation well, exist the pressure break of the low water cut section stablize the rerum natura interlayer to tap the latent power, also can be used for adjacent with the water logging thick oil pay, the fracturing reform of a plurality of hyposmosis oil sheets that interlayer approaches.

The utility model divides inside and outside body two large divisions, comprises throttling, packing, sandblast three big parts, it is characterized in that: the length of this kind packer packing spacing body (16) and quantity are by the thickness and the number of plies decision of processing intent layer; Sandblast parts are arranged between two packer accessories (16); Fixation type throttle is chewed.Throttling is chewed and is positioned at endosome top, can make in the oil pipe, the outer pressure reduction that produces, in hydraulic pressure passes through, pilot space between the ectosome, make the packer accessory expansion, this packer can be according to the needs assembling varying number of core intersection and oil formation improvement, the packer accessory of different length, processing intensity for the enhancement purpose layer, 2 sandblast parts also can be arranged, packer accessory can cover the non-imbibition borehole of target zone in the conventional perforated hole, utilize the quantity and the distribution of packer accessory and sandblast component controls target zone imbibition borehole, thereby reach the required low-density perforation number of current limliting pressure break, use the current limliting fracturing process then, reach and once add the purpose that sand is handled several oil reservoirs simultaneously.But this packer is the packing stratum both, can cover the non-imbibition borehole of target zone again, and the sandblast parts are aimed at the oil reservoir position that needs processing.By the fracturing string that this packer is formed, can control the position of target zone imbibition borehole and handle intensity, make it form effective fracture at this position, the target zone is under a pressure system during pressure break, and packer accessory sets simultaneously, and the sandblast parts are hydrojet simultaneously.The length of entire tool determines according to core intersection, but because underground work Hoisting System height restriction, can use the pilot seal section with the use that connects together of several packers.

The drawing of accompanying drawing is described as follows:

Fig. 1: location current limliting pressure break packer construction schematic diagram.

A-A cross section view among Fig. 2, Fig. 1.

Fig. 3, pilot seal section structural representation.

Fig. 4, the on-the-spot fracturing string schematic diagram that uses.

The utility model is described in further detail below in conjunction with accompanying drawing.

Shown in Figure 1: the utility model packing parts have the packer ectosome of being made up of top connection (1), pipe nipple (11), joint (12), upper steel bowl (14), packer accessory (16), sandblast bowl (21), lower steel bowl (25), lower contact (26), sealing ring (13,22), be sandblast bowl (21) between two packer accessories (16), above-mentioned each part is connected as a single entity by screw thread; The packer endosome is made up of throttle part, central tube, sealing ring (6,7,9,17,20), and the pilot space is arranged between inside and outside body, and both link to each other with the joint screw thread by central tube.Throttle part is positioned at the endosome topmost, by screen cover (2), throttling chew (3), cut off pin (4), seal pin (5), stifledly chew (8), seal section (10) is formed.

Screen cover (2) has 48 road strias, places top connection (1) and throttling to chew between (3), and filter sand and pressure transmission effect are arranged.

(3) upper end is chewed in throttling a step, and the screen cover lower end is positioned herein, by the middle and upper part one inner bolt hole is arranged, and there is button in a section lower end; Stifled chew (8) cotter slot and two seals groove are arranged, sealing ring (7) places in the groove; Cutting off pin (4) chews throttling (3) and chews (8) and connect together with stifled; Seal pin (5) is chewed (3) screwed connection with throttling; (3) screwed connection is chewed with throttling in seal section (10) upper end, and the lower end is positioned the place of topping bar of upper center tube (15), and its upper and lower end respectively has the two seals groove, and sealing ring (9) places in the groove, makes the contact surface sealing.This packer throttling is chewed to fixed, when the rising of tubing string hydraulic pressure, cuts off pin (4) and is cut off during use, makes the inside and outside generation chock pressure difference of oil pipe, and hydraulic pressure makes the packer accessory expansion by the pilot passage.Block up and play the blowout prevention effect when chewing (8) operation.

Central tube by upper center tube (15), inner central tube assembly, in connect central tube (23), lower center tube (24) is formed, each part screw thread fuses; 8 uniform pressure guide holes (29) are arranged at upper center tube (15) top, and upper and lower end links to each other with joint (12), interior pipe (18) screw thread respectively; Lower center tube (24) lower end links to each other with lower contact (26) screw thread.

Shown in Fig. 1 .2: the sandblast parts are made up of inner central tube assembly and sandblast bowl (21), the inner central tube assembly is welded by interior pipe (18), the collar (19), there are pilot passage (28), middle part to have 3 sandblast holes (30) between the two, the collar (19) upper and lower end respectively has two seal grooves, it cooperates with packer accessory (16) size, and sandblast bowl (21) middle part has 4 spray holes (27).The sandblast parts are aimed at target zone to be processed, can control imbibition borehole quantity and distribution.

This packer can be according to the packer accessory (16) of the needs of core intersection and oil formation improvement assembling varying number, different length, for the processing intensity of enhancement purpose layer also can have 2 sandblast parts in target zone.

Shown in Fig. 3,4: the pilot seal section is made up of pilot body (31), sealing ring (32), pilot body (31) upper and lower end respectively has 2 seal grooves, it cooperates with the upper center tube size, and middle part, pilot body (31) outside is fluted, can with is connected formation pilot space between the short circuit (36).Because Hoisting System height restriction during underground work, construction for convenience, available pilot seal section connects together several packers, lower center tube (24) with higher level's packer during use changes the upper center tube (15) that has pressure guide hole into, the pilot seal section places between the upper center tube (15) of two-stage packer, between the lower contact (26) of upper and lower level packer and the joint (12) with being connected pipe nipple (36) binding.

Shown in Figure 4, form fracturing string by orientation spool (33), seating nipple (34), location current limliting pressure break packer (35), connection pipe nipple (36), pilot seal section (37), plug (38), oil pipe (39), sleeve pipe (40) during on-the-spot the use.During construction; precalculated position with packer (35) classification G.I.H target zone; after tubing string has descended; in tubing string, beat hydraulic pressure; when hydraulic pressure raises; cutting off pin (4) is cut off; stifled chew (8) along tubing string in tail pipe; after operational discharge capacity reaches certain value; throttling is chewed (3) and is made in the oil pipe; the outer pressure reduction that produces; hydraulic pressure flows out from screen cover (2) stria in the oil pipe; enter pressure guide hole (29) through the pilot space and import packer accessory (16) inner chamber into, again through pilot passage (28); the pilot seal section be connected the pilot space that forms between pipe nipple, the packer accessory of multiple-string packer is set simultaneously; packer accessory (16) covers the non-imbibition borehole of target zone (42); the sandblast parts are to granting handling oil layer (41) hydrojet simultaneously, and the target zone makes on the interlayer between the target zone under a pressure system during pressure break; following pressure reduction is identical; help protecting short lap, and reach the purpose that once construction can be handled multilayer.

This utility model compared with prior art has the following advantages: this packer can basis The needs of core intersection and oil formation improvement, the packer accessory of assembling varying number, different length, packer itself not only can the packing stratum, also can cover the non-imbibition borehole of target zone, and the sandblast parts are arranged; The fracturing string that this packer and other accessory form can be controlled the position of target zone imbibition borehole and process intensity, has selective strong characteristics during pressure break. Packer itself has pilot space and pilot passage; packer accessory on the tubing string can be set simultaneously, and the sandblast parts are hydrojet simultaneously, and the target zone is under same pressure system during pressure break; the short lap between target zone can be protected, and the purpose of a construction processing multilayer can be reached.

The utility model provides a kind of novel packer for the high density pattern perforation well uses limited entry fracture treatment.

Claims (5)

1, the packer used of a kind of oil field compression fracture divides inside and outside body two large divisions, comprises throttling, packing, sandblast three big parts, it is characterized in that: the length of packer accessory in this packer (16) and quantity are by the thickness and the number of plies decision of processing intent layer; Sandblast parts are arranged between two packer accessories (16); Fixation type throttle is chewed.

2, packer as claimed in claim 1, it is characterized in that: the packing parts have the packer ectosome of being made up of top connection (1), pipe nipple (11), joint (12), upper steel bowl (14), packer accessory (16), sandblast bowl (21), lower steel bowl (25), lower contact (26) and sealing ring (13,22), be sandblast bowl (21) between two packer accessories (16), above-mentioned each part is connected as a single entity by screw thread; The packer endosome is made up of throttle part, central tube and sealing ring (6,7,9,17,20); The pilot space is arranged between inside and outside body.

3, as claim 1,2 described packers, it is characterized in that: throttle part is positioned at the endosome topmost, by screen cover (2), throttling chew (3), cut off pin (4), seal pin (5), stifledly chew (8), seal section (10) is formed, screen cover (2) has 48 road strias, places top connection (1) and throttling to chew between (3); Cut off pin (4) and throttling is chewed (3) and chew (8) and connect together with stifled, seal pin (5) is chewed (3) screwed connection with throttling; (3) screwed connection is chewed with throttling in seal section (10) upper end, and the lower end is positioned upper center tube (15) top.

4, packer as claimed in claim 2 is characterized in that: central tube by upper center tube (15), inner central tube assembly, in connect central tube (23), lower center tube (24) is formed, each part screw thread fuses; 8 uniform pressure guide holes (29) are arranged at upper center tube (15) top, and upper and lower end links to each other with joint (12), interior pipe (18) screw thread respectively; Lower center tube (24) lower end links to each other with lower contact (26).

5, as claim 1,4 described packers, it is characterized in that: the sandblast parts are made up of inner central tube assembly and sandblast bowl (21); The inner central tube assembly is welded by interior pipe (18), the collar (19), and pilot passage (28) is arranged between the two, and the middle part has 3 sandblast holes (30), and the collar (19) upper and lower end respectively has two seal grooves, and it cooperates with packer accessory (16) size; Sandblast bowl (21) middle part has 4 spray holes (27).

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