CN200943455Y - Expandable tail tube suspension device for petroleum drilling well - Google Patents

Abstract

The utility model is an expansion tailpipe hanger device for petroleum drilling, including an expansion steel pipe, a central pipe, an expansion cone, an end plug and a rubber ring. The expansion steel pipe is a through-hole structure, with the upper part made into a bell mouth with a connecting thread; the bell mouth has the rubber ring on the top and a connecting thread on the bottom. The utility model has the following advantages: it combines the functions of a tailpipe hanger and a packer on the tailpipe; after hanging is done, the inner diameter is larger than that of the auxiliary bushing, which is good for production and the later work; the drilling cost is reduced greatly; the device also plays an important role to plug abnormal pressure strata and patch casings.

Description

A kind of inflatable tail tube hanging device that is used for oil drilling

Technical field

The utility model is a kind of inflatable tail tube hanging device that is used for oil drilling.

Technical background

Development along with drilling technology, the continuous rise of drilling technologies such as deep-well, ultradeep well, high angle hole, horizontal well, Multilateral Wells, the little gap of slim-hole well, and the high speed development of old well SIDETRACKING TECHNOLOGY, the liner completion The Application of Technology more and more widely, these are treated that different well carries out the liner completion operation and uses existing hanger to be difficult to satisfy to produce needs, sometimes even cause great down-hole accident.

The tail tube hanging completion technique runs into increasing technical barrier, is mainly caused by the hanger unreasonable structure:

(1) the hanger product hangs back sealing performance extreme difference, and statistics shows that nearly the waterpower leakage all can appear in 45%～60% conventional hanger after seat is put;

(2) existing hanger easily causes to sit in advance in the casing job circulation and hangs;

(3) generally need after drilling liner cementing or the solid sleeve pipe superposition section with the logical horn mouth of undersized drilling tool;

(4) hitch of hanger, particularly slip system is unreasonable, easily causes to hang to lose efficacy.

Summary of the invention

Casing programme complexity in the on-the-spot drilling engineering, the cost height.Permanent plastic deformation radially can take place in the body of expandable steel tubular, to reach the success rate of remarkable reduction drilling completion cost, optimization casing programme and raising liner completion, enlarges the scope of application of hanger, satisfies the needs of exceptional well completion construction.The purpose of this utility model is to provide a kind of inflatable tail tube hanging device that is used for oil drilling to the scene.

The utility model is to realize like this.Inflatable tail tube hanging device is a through-hole structure by expandable steel tubular, and horn mouth is processed on top, and is processed with thread, and the horn mouth lower end is with rubber ring, and the bottom is processed with thread, expandable steel tubular lower end union tail.

Advantage of the present utility model is:

(1) inflatable tail tube hanging device is the function that integrates extension hanger and tail pipe upper packer, one section tail pipe is expanded, high-performance, high-intensity rubber ring makes tail tube hanging on the sleeve pipe of upper strata, guarantee enough loop strength and sealing performance, after inflatable suspension tail pipe is sat and is put well, because of the annular space section minimum, can increase inner effective flow area, can prevent that conventional hanger from sitting puts the waterpower that the back occurs and leaks, thereby saving cement, the expense that extension hanger and packer etc. are relevant, make annular space have necessary waterpower integrality, help boring well deeplyer;

(2) after inflatable tail tube hanging device hangs and to finish, simple in structure, there are not mechanisms such as central tube, slips, internal diameter is greater than matching used sleeve pipe, effectively improves the smooth and easy of the bulk strength of hanger and other intraductal operation.

Description of drawings

Schematic diagram before the construction of Fig. 1 inflatable tail tube hanging device

1. expandable steel tubular 2. rubber rings 3. plugs 4. central tubes 5. circulation ports 6. expansion cone 7. outer layer sleeves 8. tail pipes

Fig. 2 inflatable tail tube hanging device construction back schematic diagram

1. expandable steel tubular 2. rubber rings 7. outer layer sleeves 8. tail pipes

The specific embodiment

Now the utility model will be further described in conjunction with Figure of description.After drilling well finishes, be lowered to inflatable tail tube hanging device and tail pipe 8, after arriving assigned address, by mode mechanical or that suppress, pressure acts on the bottom of expansion cone 6 by central tube 4 or circulation port 5, makes expansion cone 6 in central tube 4 upper edge axial downward movement, causes expandable steel tubular 1 and rubber ring 2 radially producing permanent plastic deformation, thereby rubber ring 2 is compressed between expandable steel tubular 1 outer wall and outer layer sleeve 7 inwalls, plays the double action that hangs tail pipe and hydraulic seal.After suspension is finished, trip out plug 3, central tube 4 and expansion cone 6, construction effect as shown in Figure 2.

Claims (2)

1. inflatable tail tube hanging device that is used for oil drilling, comprise expandable steel tubular, central tube, expansion cone, plug and rubber ring, it is characterized in that: expandable steel tubular [1] is a through-hole structure, horn mouth is processed on top, and be processed with thread, the horn mouth bottom is with rubber ring [2], and the bottom is processed with thread.

2. inflatable tail tube hanging device as claimed in claim 1 is characterized in that: expandable steel tubular [1] lower end union tail [5].

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