CN200961475Y - Large sand volume seating pressure three-layer fracturing string - Google Patents

Abstract

A larger sands seating pressure three-layer fracturing string mainly solves the problem that the present fracturing string only can sit one-layer pressure. The utility model is characterized in that a oil tube (1) is connected with a safety joint (2), and the oil tube (1) on the lower end of the safety joint (2) is connected with a waterpower anchor (3); and the oil tube (1) on the lower end of the waterpower anchor (3) is sequentially connected with an upper packer (4), an upper larger sands pressure transmitting sand-blower (5), a middle packer (6), a middle larger sands pressure transmitting sand-blower (7), a lower packer (8), a lower larger sands pressure transmitting sand-blower (9), a final packer (10) and a pipe plug (11). The larger sands seating pressure three-layer fracturing string has the characteristics of fracturing construction of larger sands seating pressure multilayer, high fracturing efficiency and low construction cost.

Description

Large sand amount is sat and is pressed three laminations to split tubing string

Technical field:

The utility model relates to the used tubing string of oil field compression fracture construction, and especially the large sand amount seat presses three laminations to split tubing string.

Background technology:

Along with the development in oil field, in the oil field compression fracture rebuilding construction, low permeability oil field more and more becomes the main battle ground of fracturing developing, and it is increasing to add the larger pressing crack construction ratio of sand, and it is also in rising trend to add the sand scale.In fracturing process, existing fracturing string type can only be sat pressure one deck when implementing extensive pressure break, when a bite well needs several layers of position of while pressure break, need in fracturing process, carry out the upper lifting pipe column operation, not only influence fracturing effect, but also cause environmental issue, well control problem and safety problem.Aspect environmental protection, owing to also descending the step pressing crack construction after carrying on the former tubing string, can not implement to throw stifled operation, the interior overflow of pipe is uncontrollable, and fracturing fluid is spilled over to ground and pollutes; Aspect well control, it is higher to carry in the process strata pressure on the former tubing string, easily causes the tubing string accident that flies, and needs to increase extra well control measure; At the tubing string secure context, the monomer sandblaster is finished the multilayer position and is added sand, and the tubing string serious wear easily causes engineering accidents such as disconnected tubing string.So existing tubing string type can't satisfy large sand amount and sit the construction requirement of pressing multilayer at all, the tubing string efficient of this structural shape is low, is unfavorable for applying.

The utility model content:

Can only sit the problem of pressing one deck in order to solve existing fracturing string, the utility model provides a kind of large sand amount seat to press three laminations to split tubing string, these large sand amount seat pressure three laminations split tubing string and have the construction of large sand amount seat pressure multiple fracturing, pressure break efficient height, the characteristics that construction cost is low.

The technical solution of the utility model is: these large sand amount seat pressure three laminations split tubing string and comprise plug, large sand amount pilot sandblaster, packer, hydraulic anchor, safety joint and oil pipe, oil pipe is connected with safety joint on (1), be connected with hydraulic anchor on the oil pipe of safety joint lower end, be connected with upper packer on the oil pipe of hydraulic anchor lower end, be connected with large sand amount pilot sandblaster on the oil pipe of upper packer lower end, be connected with middle packer on the oil pipe of last large sand amount pilot sandblaster lower end, large sand amount pilot sandblaster in being connected with on the oil pipe of middle packer lower end, be connected with lower packet on the oil pipe of middle large sand amount pilot sandblaster lower end, be connected with down large sand amount pilot sandblaster on the oil pipe of lower packet lower end, be connected with last packer on the oil pipe of following large sand amount pilot sandblaster lower end, be connected with plug on the oil pipe of last packer lower end.

The utlity model has following beneficial effect: this large sand amount is sat and is pressed three laminations to split tubing string owing to take such scheme, on having contacted on the oil pipe, in, down, the end packer, by last, in, down, the end packer will pressure break the stratum packing, play cover by casting a grade large sand amount pilot sandblaster nozzle blanking plug again, close subordinate's large sand amount pilot sandblaster, open higher level's large sand amount pilot sandblaster, the high-pressure fluid of upper end produces chock pressure difference through higher level's large sand amount pilot sandblaster nozzle and makes packer setting, beginning position, upper strata pressing crack construction is until the pressing crack construction process of finishing this layer.Implement large sand amount and can not sit and press multilayer, sit and press multilayer can not carry out the contradiction of large sand amount construction thereby efficiently solve construct original tubing string of oil field compression fracture, can realize that monomer large sand amount pilot sandblaster device adds sand 50m ³, sit to press three laminations to split construction, increase work efficiency, reduce construction cost.Large sand amount pilot sandblaster sliding sleeve and spray nozzle clogging device cooperate plays the cover flexible movements, and self-locking mechanism is descending to be passed through, up self locking safety is reliable.Help applying.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present utility model.

1-oil pipe among the figure, 2-safety joint, 3-hydraulic anchor, 4-upper packer, the last large sand amount pilot of 5-sandblaster, packer among the 6-, large sand amount pilot sandblaster among the 7-, 8-lower packet, large sand amount pilot sandblaster under the 9-, 10-end packer, 11-plug.

The specific embodiment:

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

By shown in Figure 1, these large sand amount seat pressure three laminations split tubing string and comprise plug 11, last large sand amount pilot sandblaster 5, upper packer 4, hydraulic anchor 3, safety joint 2 and oil pipe 1, be connected with safety joint 2 on the oil pipe 1, be connected with hydraulic anchor 3 on the safety joint 2 lower end oil pipes 1, be connected with upper packer 4 on the hydraulic anchor 3 lower end oil pipes 1, be connected with large sand amount pilot sandblaster 5 on the upper packer 4 lower end oil pipes 1, packer 6 in being connected with on the last large sand amount pilot sandblaster 5 lower end oil pipes 1, large sand amount pilot sandblaster 7 in being connected with on the middle packer 6 lower end oil pipes 1, be connected with lower packet 8 on the middle large sand amount pilot sandblaster 7 lower end oil pipes 1, be connected with down large sand amount pilot sandblaster 9 on the lower packet 8 lower end oil pipes 1, be connected with last packer 10 on the following large sand amount pilot sandblaster 9 lower end oil pipes 1, be connected with plug 11 on the last packer 10 lower end oil pipes 1.

During actual the use, at first on the oil pipe 1 successively with safety joint 2, hydraulic anchor 3, upper packer 4, on large sand amount pilot sandblaster 5, middle packer 6, middle large sand amount pilot sandblaster 7, lower packet 8, large sand amount pilot sandblaster 9, last packer 10, plug 11 connect down.After connecting, high-pressure fluid by the upper end produces through large sand amount pilot sandblaster 9 nozzles down that chock pressure difference (this moment, top two-stage sandblaster was in closed condition) makes down, last packer (8,10) set, the beginning pressing crack construction is until the pressing crack construction process of finishing whole lower floor; Make a basket large sand amount pilot sandblaster 7 nozzle blanking plugs and played cover, close down large sand amount pilot sandblaster 9, large sand amount pilot sandblaster 7 in opening, the high-pressure fluid of upper end through in large sand amount pilot sandblaster 7 nozzles produce that chock pressure difference makes down, middle packer (8,6) set, layer position, beginning middle part pressing crack construction is until the pressing crack construction process of finishing this layer; Large sand amount pilot sandblaster 5 nozzle blanking plugs are played cover in the throwing, large sand amount pilot sandblaster 7 in closing, open large sand amount pilot sandblaster 5, the high-pressure fluid of upper end through last large sand amount pilot sandblaster 5 nozzles produce chock pressure difference make in, upper packer (6,4) set, beginning upper layer position pressing crack construction is until the pressing crack construction process of finishing this layer.After pressing crack construction finishes, close well head, diffusion pressure, the packer deblocking trips out tubing string.Because of the upper, middle and lower of having contacted successively on the oil pipe 1, last packer (4,6,8,10) and upper, middle and lower large sand amount pilot sandblasters (5,7,9), by upper, middle and lower, last packer (4,6,8,10) will need the stratum packing of pressure break, play cover by throwing different large sand amount pilot sandblaster nozzle blanking plugs again, close subordinate's large sand amount pilot sandblaster, open higher level's large sand amount pilot sandblaster, just can begin one deck position pressing crack construction down, until the pressing crack construction process of finishing this layer.Implement large sand amount and can not sit and press multilayer, sit and press multilayer can not carry out the contradiction of large sand amount construction thereby efficiently solve construct original tubing string of oil field compression fracture, can realize that monomer large sand amount pilot sandblaster adds sand 50m ³, sit to press three laminations to split construction, increase work efficiency, reduce construction cost.Large sand amount pilot sandblaster sliding sleeve and spray nozzle clogging device cooperate plays the cover flexible movements, and self-locking mechanism is descending to be passed through, up self locking safety is reliable.

In sum, this large sand amount is sat and is pressed three laminations to split tubing string to have large sand amount and sit and press multiple fracturing Construction, pressure break efficient height, the characteristics that construction cost is low.

Claims (1)

1, a kind of large sand amount is sat and is pressed three laminations to split tubing string, comprise plug (11), last large sand amount pilot sandblaster (5), upper packer (4), hydraulic anchor (3), safety joint (2) and oil pipe (1), it is characterized in that: be connected with safety joint (2) on the oil pipe (1), be connected with hydraulic anchor (3) on safety joint (2) the lower end oil pipe (1), be connected with upper packer (4) on hydraulic anchor (3) the lower end oil pipe (1), be connected with large sand amount pilot sandblaster (5) on upper packer (4) the lower end oil pipe (1), be connected with middle packer (6) on last large sand amount pilot sandblaster (5) the lower end oil pipe (1), large sand amount pilot sandblaster (7) in being connected with on middle packer (6) the lower end oil pipe (1), be connected with lower packet (8) on middle large sand amount pilot sandblaster (7) the lower end oil pipe (1), be connected with down large sand amount pilot sandblaster (9) on lower packet (8) the lower end oil pipe (1), be connected with last packer (10) on following large sand amount pilot sandblaster (9) the lower end oil pipe (1), be connected with plug (11) on last packer (10) the lower end oil pipe (1).

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