CN212774223U - Carbon dioxide huff and puff horizontal well injection-production wellhead - Google Patents

Abstract

The utility model relates to a carbon dioxide is taked in and send out horizontal well notes and is adopted well head. The problem of current ordinary well head can't satisfy long-term low temperature resistant corrosion resisting property and gas injection well head can't satisfy the production requirement of directly opening the well after the shut-in is mainly solved. The method is characterized in that: a six-way sleeve head body (11) is connected between the upper flange (8) and the sleeve flange (1), 4 through holes on two sides of the six-way sleeve head body (11) are respectively connected with the hoop sheet assemblies (3), each hoop sheet assembly (3) is sequentially connected with 2 gate valves (5) in series, the 2 gate valves (5) are connected by hoop sheets (10), and the ports of the 2 gate valves (5) on one side are respectively connected with a pressure gauge (13); the six-way casing head body (11) is internally provided with a tubing hanger (4). The carbon dioxide huff and puff horizontal well injection and production wellhead can resist weak acid corrosion for a long time, normally work at the temperature of minus 40 ℃, can be directly used for well opening production after carbon dioxide is injected for soaking, and does not need to be replaced.

Description

Carbon dioxide huff and puff horizontal well injection-production wellhead

Technical Field

The utility model relates to an oil field oil production engineering technical field, in particular to carbon dioxide is taked in and send out horizontal well injection and is adopted well head.

Background

The carbon dioxide huff and puff technology is mostly applied to a vertical well, the injection amount is less (less than 300t) during construction, the used well head is a common 250-type well head, the pressure of the well head is 25MPa, and the well head does not need to be replaced in the injection and production process. The injection amount of liquid carbon dioxide injected in the horizontal well carbon dioxide huff-puff test is large, carbon dioxide produced for a long time in the production process can form carbonic acid when meeting water to corrode a well mouth, and the conventional common 250 well mouth cannot meet the test of low temperature, high pressure and carbonic acid corrosion for a long time; the special 35MPa gas injection well head is too high, can only meet the injection requirement, can not meet the requirement of direct well opening production, and the potential safety hazard is great in the operation process of replacing the ordinary oil extraction well head when pumping, and the environmental protection pressure is great.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome the current ordinary well head that exists in the background art and can't satisfy the problem that the production requirement of directly opening the well after low temperature corrosion resisting property and gas injection well head can't satisfy the braising well for a long time, and provide a carbon dioxide horizontal well injection well head of taking in and taking out, this carbon dioxide horizontal well injection well head of taking in and taking out, can resist weak acid corrosion for a long time, the temperature is at-40 ℃ normal work, direct production of opening the well after having annotated the carbon dioxide braising well, need not change the well head.

The utility model provides a its problem accessible reach as follows technical scheme: the carbon dioxide huff and puff horizontal well injection and production wellhead comprises an upper flange and a casing flange, wherein a six-way casing head body is connected between the upper flange and the casing flange; 4 through holes on two sides of the six-way sleeve head body are respectively connected with a clamp sheet assembly, each clamp sheet assembly is sequentially connected with 2 gate valves in series, the 2 gate valves are connected by clamp sheets, and the ports of the 2 gate valves on one side are respectively connected with a pressure gauge; an oil pipe hanger is arranged in the head body of the six-way casing pipe.

Compared with the above background art, the utility model can have following beneficial effect: according to the injection and production wellhead of the carbon dioxide huff and puff horizontal well, when the carbon dioxide huff and puff test is carried out on the compact oil block horizontal well, the pressure is tested at 25MPa on site, the pressure is stabilized for 5min and is not reduced, the pressure is less than 15MPa during injection construction, and the conversion from injection to production is smooth. After 1 year of test, the inside of the wellhead is basically free from corrosion, the whole wellhead has no cracks, and the application effect is good. Can resist weak acid corrosion for a long time, normally work at the temperature of minus 40 ℃, can be directly used for well opening production after carbon dioxide is injected for soaking, and does not need to replace a well mouth.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a sleeve flange; 2. sealing the steel ring; 3. a clip sheet assembly; 4. hanging the oil pipe; 5. A gate valve; 6. a clamp head; 7. a high-strength bolt; 8. an upper flange; 9. a paraffin removal gate and a packing box; 10. a clip sheet; 11. a six-way casing head body; 12. plugging with a thread; 13. a pressure gauge assembly; 14. and (5) jacking the screw.

The specific implementation mode is as follows:

the invention will be further explained with reference to the drawings:

as shown in attached figure 1, the carbon dioxide huff and puff horizontal well injection and production wellhead comprises an upper flange 8 and a casing flange 1, wherein the upper flange 8 and the casing flange 1 are connected with a six-way casing head body 11 through a high-strength bolt 7, and a sealing steel ring 2 is arranged between the casing flange 1 and the six-way casing head body 11; 4 through holes on two sides of the six-way sleeve head body 11 are respectively connected with a clamp sheet assembly 3, each clamp sheet assembly 3 is sequentially connected with 2 gate valves 5 in series, the 2 gate valves 5 are connected by a clamp sheet 10, and the ports of the 2 gate valves 5 on one side are respectively connected with a pressure gauge 13 through a clamp head 6 and a plug 12 in sequence; the upper part of the upper flange 8 is connected with a gate valve 5, a paraffin removal gate and a packing box 9 through a clamping hoop sheet 10; an oil pipe hanger 4 is arranged in the six-way casing head body 11; the six-way casing head body 11 is screwed and fixed on the tubing hanger 4 through a top thread 14 of an upper end flange.

The injection and production wellhead of the carbon dioxide huff and puff horizontal well is made of a low-temperature-resistant high-pressure-resistant anticorrosive stainless steel material, the temperature grade is-46 ℃ to +121 ℃, a nickel coating is coated on the exterior of the horizontal well, the material grade meets NACE MR-0175 standard, and the rated working pressure is as follows: 24.5 MPa.

The assembly and use process of the injection and production wellhead of the carbon dioxide huff and puff horizontal well comprises the following steps of replacing the wellhead before gas injection, firstly connecting fittings at two sides of a six-way casing head body 11, connecting two sides of the six-way casing head body 11 with 2 gate valves 5 through a hoop sheet assembly 3 and a hoop head 10, connecting 27/8' screw plugs at the right side through screw threads, and connecting a pressure gauge assembly to the screw plugs through screw threads; secondly, dismantling the original wellhead flow, installing a casing flange 1, connecting the casing flange 1 with a casing short-circuit thread (the original well with the casing flange is omitted in the step), and placing 211 a sealing steel ring; thirdly, mounting a six-way casing head body, and connecting the casing flange with the six-way casing head body through a high-strength bolt; fourthly, an oil pipe hanger is put in, all telescopic jackscrews which move upwards on a fixed hanger of a flange at the upper end of the six-way casing head body are withdrawn, the oil pipe hanger is put in, the upper end and the lower end of the oil pipe hanger are connected by 2-7/8 ' UPTBG internal threads, the lower end of the oil pipe hanger is provided with 2-7/8 ' EU multiplied by 2-7/8 ' NU double male short sections, one of the double male short sections is connected with a well completion oil pipe, and the telescopic jackscrews of the flange at the upper end of the six-way casing head body are screwed to fix; finishing the pumping rod; and fourthly, installing the upper half part of the wellhead, connecting the upper flange 8 with the six-way casing head body through a high-strength bolt, connecting the hoop piece 10 with the gate valve 5, and connecting the paraffin removal valve and the packing box 9 which are filled into the polished rod on the gate valve through the hoop piece to complete the installation of the wellhead.

Claims (5)

1. The utility model provides a carbon dioxide is taked in andsend out horizontal well notes and is adopted well head, includes flange (8), casing flange (1), its characterized in that: a six-way casing head body (11) is connected between the upper flange (8) and the casing flange (1); 4 through holes on two sides of the six-way sleeve head body (11) are respectively connected with a hoop sheet assembly (3), each hoop sheet assembly (3) is sequentially connected with 2 gate valves (5) in series, the 2 gate valves (5) are connected by a hoop sheet (10), and ports of the 2 gate valves (5) on one side are respectively connected with a pressure gauge (13); the six-way casing head body (11) is internally provided with a tubing hanger (4).

2. The carbon dioxide huff and puff horizontal well injection and production wellhead as claimed in claim 1, wherein: the six-way casing head body (11) is screwed and fixed on the tubing hanger (4) through a jackscrew (14) of an upper end flange.

3. The carbon dioxide huff and puff horizontal well injection and production wellhead as claimed in claim 1, wherein: the upper part of the upper flange (8) is connected with a gate valve (5), a paraffin removal gate and a packing box (9) through a clamping hoop sheet (10).

4. The carbon dioxide huff and puff horizontal well injection and production wellhead as claimed in claim 1, wherein: and a sealing steel ring (2) is arranged between the sleeve flange (1) and the six-way sleeve head body (11).

5. The carbon dioxide huff and puff horizontal well injection and production wellhead as claimed in claim 1, wherein: the ports of the 2 gate valves (5) are respectively connected with a pressure gauge (13) through a clamp head (6) and a plug (12) in sequence.

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