CN2864316Y

CN2864316Y - Air reservation used well bore for underground gas-storage well

Info

Publication number: CN2864316Y
Application number: CN 200520035717
Authority: CN
Inventors: 冉训
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-11
Filing date: 2005-10-11
Publication date: 2007-01-31
Anticipated expiration: 2015-10-11

Abstract

The utility model relates to a shaft for the underground storage of high-pressure gas, including the shaft body, a connecting bushing, a cross joint control head set at the upper opening, an end plate of one-way valve set at the bottom, a foundation fixing support and a fluid discharging pipe. Because the one-way valve is taken as the end plate at the bottom of the shaft and the foundation fixing support is added, the advanced mode of pouring cement mortar into the cavity of the shaft can be adopted for fixing. It is characterized with feasible shaft structural design, convenient and reliable operation for pouring and fixing, assurance for the consolidated joint between the shaft and the shaft wall without loose, excellent application safety, convenient for repair and maintenance and prolonged service life, etc. It overcomes the existing technical problems of shaft such as inconvenience for installation and fixing, little adhesive force to the cement, poor reliability, inconvenience for operation, frequent rotation and serial motion of shaft, insufficient safety and much negative effect for the service life, etc.

Description

Well for storage gas storage pit shaft

Technical field

The utility model belongs to pressurized gas underground gas storage device, the particularly a kind of and supporting gas storage pit shaft of using of high-pressure natural gas well for storage.

Background technique

At notification number is that CN2281418y, name are called in the patent documentation of " well for storage of high pressure gas ", disclosed employing sleeve pipe screw thread is with the joint joint cylindrical shell composition well bore that links into an integrated entity, and oral area is provided with wellhead flange thereon, in its bottom dome head is set, to form the pit shaft main body; The four-way control head is set on wellhead flange, and in cylindrical shell, is provided with one, thereby constitute well for storage gas storage pit shaft by the liquid-discharging tube at the bottom of the through pit shaft of four-way control head.This pit shaft is owing to be the cylindrical metal pipe, and the tube end is spherical sealing head, and does not have the structure that anti-cylindrical shell rotates, and the power that cement slurry adheres to it is poor.When under this pit shaft in basic well after, traditional method is a grout injection between the pit shaft and the borehole wall from top to bottom, itself and the borehole wall are fixed, because the gap between the pit shaft and the borehole wall generally is no more than 3.0cm, and well depth generally is 80～150m, cement slurry is difficult to reach 10m with upper/lower positions, and the underground water between the pit shaft and the borehole wall and air also cannot be discharged.At this defective, be that CN1384308A, name are called in the patent documentation of " fixation method of underground gas storage well shaft " at notification number, an a kind of side from the pit shaft flexible pipe that avales is disclosed again, by the shaft bottom upwards grouting with the fixing method of pit shaft.Though this method has overcome the conventional method cement slurry and has irritated down that depth as shallow and air and underground water cannot be discharged, influenced under the pit shaft, the fixation problem of bottom; But exist because the wellhole perpendicularity that adopts geological drilling to offer is poor, the borehole wall is uneven, and pit shaft is a rigidity, grouting hose easily is crushed and causes cement slurry not descend to irritate, cement slurry with filling at present very easily holds up cylindrical shell again, difficulty of construction is big, cement slurry also be difficult under be poured into ground, influence fixed effect, be difficult to the pit shaft and the borehole wall are frozen into one.Therefore, background technique gas storage pit shaft adopts above-mentioned the sort of cementing method all to have fixing difficulty, poor reliability, pit shaft is easily loosening in the using process, both can produce left rotation and right rotation, the phenomenon that can take place to go here and there up and down again, particularly under the big situation of variation of ambient temperature, the pit shaft long section (repeatedly accident once took place) of can popping out when serious, not only influence is normal uses, and facility and staff's safety is threatened.Therefore, there is the structure of pit shaft in the above-mentioned background technology, particularly the wellbore bottom structural design unreasonable, can not realize that by pit shaft inner chamber grout injection between shaft bottom and the pit shaft and the borehole wall it is easily loosening to be difficult to be tightened to one, pit shaft through cement slurry between the pit shaft and the borehole wall; Poor stability in the use is safeguarded, maintenance is inconvenient and influence disadvantage such as working life.

Summary of the invention

The purpose of this utility model is the disadvantage that exists at background technique, a kind of well for storage gas storage of research and design pit shaft, change the wellbore bottom structure, make it between the pit shaft and the borehole wall, reach shaft bottom grouting by the pit shaft inner chamber, reach install and fix conveniently, reliable, the pit shaft and the borehole wall are connected firmly, and can not become flexible, guarantee the Security of using and increase the service life purposes such as maintenance, easy maintenance.

Solution of the present utility model is to adopt check valve body as the wellbore bottom end socket, and sets up a support body that can be fastenedly connected and can prevent the pit shaft rotation by cement slurry and shaft bottom ground in valve body lower portion; So that pass through the pit shaft inner chamber through the annular space grout injection of one-way valve between shaft bottom and the pit shaft and the borehole wall, thereby realize its purpose.Therefore, pit shaft of the present invention comprises cylindrical shell and connecting sleeve thereof, is located at four-way control head, bottom bulkhead and the liquid-discharging tube of upper oral part; Key is that bottom bulkhead is an one-way valve, also is provided with a basic fixed frame in the bottom of check valve body; One-way valve is fastened and connected with cylindrical shell by the conduit screw thread of valve body and cylindrical shell lower end is secondary, and the basic fixed frame then is tightened to one with the valve body bottom.

Above-mentioned one-way valve is the conduit back-pressure valve, comprises tubular valve body, valve seat, sacculus, spool and return spring.The basic fixed frame comprises support body, frame hole, cross rib and base ring.

The present invention is owing to adopt one-way valve as the wellbore bottom end socket and set up the basic fixed frame, thereby can adopt by the advanced technologies of pit shaft inner chamber through the one-way valve grouted solid.Thereby have that shaft structure is reasonable in design, grouted solid is easy to operate, reliable, can guarantee that pit shaft firmly is connected with the borehole wall, can become flexible, safety in utilization is good, maintenance, easy maintenance and the characteristics such as working life that can prolong the gas storage pit shaft.

Description of drawings

Fig. 1, shaft structure schematic representation of the present invention.

Among the figure: 1, cylindrical shell, 2, connecting sleeve, 3, the draining cover, 4, wellhead flange, 5, the four-way control head, 6, valve body, 6～1, valve seat, 6～2, spool, 6～3, sacculus, 6～4, return spring, 7, fixing frame, 7～1, the cross rib, 7～2, the frame hole, 7～3, base ring.

Embodiment

With the pit shaft external diameter is 7 o'clock (177.8mm), and the pit shaft that total effectively gas storage length is 120m is an example:

Cylindrical shell 1, connecting sleeve 2, liquid-discharging tube 3, wellhead flange 4, four-way control head 4 is all identical with background technique.Valve body 6 present embodiments adopt oil, gas field drilling well with 7 o'clock conduit back-pressure valves; Fixing frame 7 adopts the 7 o'clock conduits identical with cylindrical shell 1 to be welded in valve body 6 infraorals, the high 1200mm of axis and be that the cross rib 7-1 of φ 30mm strengthens by two cover rib diameters, symmetry is opened the frame hole 7-2 of 4 800 * 50mm (high * wide) on the barrel, base ring 7-3 is toothed base ring, external diameter φ 20mm.

Claims

1, a kind of well for storage gas storage pit shaft comprises cylindrical shell and connecting sleeve thereof, is located at four-way control head, bottom bulkhead and the liquid-discharging tube of upper oral part; It is characterized in that bottom bulkhead is an one-way valve, also is provided with a basic fixed frame in the bottom of check valve body; One-way valve is fastened and connected with cylindrical shell by the conduit screw thread of valve body and cylindrical shell lower end is secondary, and the basic fixed frame then is tightened to one with the valve body bottom.

2, by the described well for storage gas storage of claim 1 pit shaft; It is characterized in that one-way valve is the conduit back-pressure valve, comprise tubular valve body, valve seat, sacculus, spool and return spring.

3, by the described well for storage gas storage of claim 1 pit shaft; It is characterized in that described basic fixed frame comprises support body, frame hole, cross rib and base ring.