CN203362098U - Ultrahigh-pressure coiled tubing fracture wellhead device - Google Patents

Abstract

The utility model discloses an ultrahigh-pressure coiled tubing fracture wellhead device. The ultrahigh-pressure coiled tubing fracture wellhead device comprises a flange adapter, a tubing cross, a Y-shaped cross and coiled tubing. The upper portion of the tubing cross is connected with a mandrel type tubing suspender, the inside of the Y-shaped cross is connected with coiler tubing protecting sleeves, and the upper portion of the main path of the Y-shaped cross is connected with a Christmas tree cap; the lower portion of the tubing cross is connected with the flange adapter, the tubing cross is connected with the main path of the Y-shaped cross through first flat gate valves, and the left path and the right path of the Y-shaped cross are respectively connected with a union flange through second flat gate valves; the coiled tubing extends under a shaft through the Y-shaped cross, and the middle portion of the coiled tubing is separated by the coiled tubing protecting sleeves. According to the ultrahigh-pressure coiled tubing fracture wellhead device, by means of the coiled tubing protecting sleeves, the impact, corrosion and wearing on the coiled tubing during high-pressure fracturing fluid injection can be reduced, so that the coiled tubing can be effectively protected.

Description

Ultra-high pressure coiled tubing fracturing wellhead device

technical field

The utility model relates to a wellhead device for fracturing, in particular to a wellhead device for coiled tubing hydraulic jet fracturing technology under the condition of ultra-high pressure (15000 Psi and above).

Background technique

At present, domestic coiled tubing technology is limited to small-scale operations such as well washing. For oil and gas wells in complex formation environments, if there are multiple oil layers in the vertical direction of the formation, and some oil layers have a large span, it is difficult to use conventional fracturing technology to operate, and the traditional fracturing wellhead device is also difficult to adapt to 15000Psi ultra-high pressure High wear conditions, and coiled tubing fracturing technology can effectively solve this problem.

Utility model content

The technical problem mainly solved by the utility model is to provide an ultra-high pressure coiled tubing fracturing wellhead device, which can meet 15000Psi ultra-high pressure and high wear fracturing conditions, and provide a wellhead device solution for coiled tubing hydraulic jet fracturing technology; provide Coiled tubing protection sleeve, when high-pressure fracturing fluid is injected, slows down the impact, corrosion and wear on the coiled tubing, effectively protecting the coiled tubing.

In order to solve the above technical problems, a technical solution adopted by the utility model is to provide an ultra-high pressure coiled tubing fracturing wellhead device, including: a flange adapter, a tubing cross, a Y-shaped cross and a coiled tubing. The upper part of the tube is connected with a mandrel type tubing hanger, the inside of the Y-shaped cross is connected with a coiled tubing protective sleeve, the upper part of the main diameter of the Y-shaped cross is connected with the Christmas tree cap; the lower part of the tubing cross is connected with a flange adapter , the oil pipe cross is connected to the main diameter of the Y-type cross through the first flat gate valve, and the left and right sides of the Y-type cross are respectively connected with union flanges through the second flat gate valve. The coiled tubing is lowered into the bottom of the well by a Y-shaped spool, and the middle of the coiled tubing is separated by a coiled tubing protective sleeve.

In a preferred embodiment of the present invention, the outlet of the four-way side of the oil pipe is connected with a first pressure gauge for measuring annular pressure.

In a preferred embodiment of the utility model, the main channel of the Y-shaped cross is connected with a second pressure gauge for measuring the internal pressure of the coiled tubing.

The beneficial effect of the utility model is that: the Y-type spool of the utility model is equipped with a coiled tubing protective sleeve, and when the high-pressure fracturing fluid is injected into the two ports of the Y-type spool, the impact, corrosion, and wear on the coiled tubing can be slowed down, and the protection cover can be effectively protected. Coiled tubing; the upper part of the tubing spool is equipped with a mandrel type tubing hanger, which is used to hang the top layer of tubing and seal off the annular pressure between the tubing and the bottom; Easy to use and long service life.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of an ultra-high pressure coiled tubing fracturing wellhead device of the present invention.

The marks of the components in the attached drawings are as follows: 1. Flange adapter, 2. Oil pipe cross, 3. Mandrel type oil pipe hanger, 4. First flat gate valve, 40. Second flat gate valve, 5. Y type cross , 6, coiled tubing protective sleeve, 7, 8, union flange, 9, christmas tree cap, 10, coiled tubing, 20, first pressure gauge, 50, second pressure gauge.

Detailed ways

The preferred embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, so that the advantages and characteristics of the utility model can be more easily understood by those skilled in the art, so that the protection scope of the utility model can be defined more clearly .

Please refer to Figure 1, the fracturing wellhead device is suitable for ultra-high pressure 15000Psi working conditions, the embodiment of the utility model includes: an ultra-high pressure coiled tubing fracturing wellhead device, including: flange adapter 1, tubing cross 2. Y-shaped spool 5 and coiled tubing 10, the upper part of tubing spool 2 is connected with mandrel-type tubing hanger 3, the inside of Y-shaped spool 5 is connected with coiled tubing protective sleeve 6, the left and right sides of Y-shaped spool 5 The diameters are respectively connected with union flanges 7 and 8 through the second flat gate valve 40, the upper part of the main diameter of the Y-shaped cross 5 is connected to the Christmas tree cap 9; the lower part of the oil pipe cross 2 is connected to the flange adapter 1, and the oil pipe cross 2 2 Connect the main diameter of the Y-type cross 5 through the first flat gate valve 4, the coiled tubing 10 is run into the bottom of the well through the Y-type cross 5, and the middle of the coiled tubing 10 is separated by the coiled tubing protective sleeve 6.

Furthermore, the side outlet of the tubing spool 2 is connected with a first pressure gauge 20 for measuring annular pressure; the main channel of the Y-type spool 5 is connected with a second pressure gauge 50 for measuring the internal pressure of the coiled tubing.

When the ultra-high pressure coiled tubing fracturing wellhead device of the utility model starts the fracturing operation, the christmas tree cap 9 is opened, the coiled tubing 10 is lowered into the wellhead to reach the bottom of the well, and then the coiled tubing 10 is pumped into the coiled tubing 10 with a large displacement and high pressure. Cracking fluid, hydraulic jet fracturing; the union flanges 7 and 8 on the left and right sides of the Y-shaped spool 5 are pumped with large displacement and high-pressure fracturing fluid, which is connected to the mandrel-type tubing on the upper part of the tubing spool 2 The hanger 3 is used to suspend the oil pipe on the top layer to seal off the annular space pressure between the oil pipe and the bottom, and the fracturing fluid in the annular space is further subjected to hydraulic jet fracturing operation. At this time, the coiled tubing protective sleeve 6 can protect the intermediate coiled tubing, slow down the impact, corrosion and wear on the coiled tubing 10, effectively protect the coiled tubing, and improve the service life of the entire fracturing wellhead device.

The above is only an embodiment of the utility model, and does not limit the patent scope of the utility model. Any equivalent structure or equivalent process conversion made by using the utility model specification and accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (3)

1. a super-pressure coiled tubing device for fracturing wellhead, it is characterized in that, comprise: flange adaptor, oil pipe four-way, Y type four-way and coiled tubing, described oil pipe four-way top is connected with the mandrel type boll-weevil hanger, described Y type four-way is internally connected with the coiled tubing protective sleeve, and described Y type four-way master's latus rectum top connects tree cap; Described oil pipe four-way bottom adpting flange adapter; described oil pipe four-way is connected with the main latus rectum of Y type four-way by the first flat gate valve; the left and right sides latus rectum of described Y type four-way is connected with the union flange by the second flat gate valve respectively; described coiled tubing by Y type four-way lower going-into-well at the bottom of, the centre of coiled tubing is separated by the coiled tubing protective sleeve.

2. super-pressure coiled tubing device for fracturing wellhead according to claim 1, it is characterized in that: described oil pipe four-way (2) side outlet is connected with for measuring the first pressure meter of annular pressure.

3. super-pressure coiled tubing device for fracturing wellhead according to claim 1, it is characterized in that: the main channel of described Y type four-way (5) is connected with for measuring the second pressure meter of coiled tubing internal pressure.

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