CN100526600C

CN100526600C - Well casing protecting equipment for deep coal underground gasification production well

Info

Publication number: CN100526600C
Application number: CNB2006100475059A
Authority: CN
Inventors: 杜惠红; 李永和; 王月红; 孟祥奎; 纪宏博
Original assignee: Liaohe Petroleum Exploration Bureau
Current assignee: Liaohe Petroleum Exploration Bureau
Priority date: 2006-08-18
Filing date: 2006-08-18
Publication date: 2009-08-12
Anticipated expiration: 2026-08-18
Also published as: CN1908367A

Abstract

The invention relates to a deep-layer coal underground gasifying production well protector, which is formed by phi244.5mm internal micro-step short muffle 1, phi177.8mm external micro-step short muffle 2, phi177.8mm internal micro-step short muffle 3, phi139.7mm external micro-step short muffle 4, andphi177.8mm holing short muffle 5, wherein the muffle 1 and the muffle 4 are connected to the phi244.5mm muffle 10, and the lower end of phi139.7mm muffle 12; the muffle 5 is connected to the lower end ofphi177.8mm muffle 11; the muffle 2 and the muffle 3 are connected to the lower end of muffle 5. The invention has simple structure, to avoid high-temperature to damage the muffle and confirm normal production.

Description

Well casing protecting equipment for deep coal underground gasification production well

Technical field:

The present invention relates to a kind of pit shaft protective device that is used for the underground coal gasification(UCG) producing well, belong to coal resources production technique class.

Background technology:

Coal is the abundantest fossil energy resources of reserves, is a kind of very valuable hydrocarbon resource and industrial chemicals.Traditional coal winning technology is to use mechanical method with underground coal crushing by the hand digging tunnel, is transported to ground gradually.Be subjected to the constraint of conditions such as the artificial tunnel degree of depth, present China's also 1000 meters of less thaies of the darkest mine of mining, not only safety factor is low in the recovery process, labour intensity is big, and causes energy waste.In order to overcome the problems referred to above that traditional coal winning technology exists, particularly solve deep coal resource exploitation problem, researched and developed a kind of production Technology of deep coal underground gasification in recent years.This kind coal gasification easily is by the igniting of underground coal seam, pump into air or oxygen and steam by the boring the inside, make the coal seam have the control burning to produce high temperature and pressure, the oxidized decomposition of coal generates the mixture of carbon dioxide and combustible gas (mainly being methane, carbon monoxide and hydrogen).Utilize this technology only to extract useful constituent in the coal, and nuisances such as lime-ash, spoil, radioactive substance are stayed underground, pollute to reduce ground surface environment.Technologies such as the shaft building of this kind coal gasification production Technology collection, coal mining, energy conversion are one, its concrete implementing process is to bore two mouthfuls of wells in the coal seam, wherein a bite straight well (producing well), water horizontal well (injection well), producing well drills the coal seam, injecting well then creeps in the coal seam level, two mouthfuls of well well heads have been measured distance on ground by design, injecting the shaft bottom of well and the coal seam of producing well connects in the bottom in coal seam, setting of casing well cementation respectively after the completion, perforation is carried out in the perforation degree of depth in producing well well cementation back, injects to drill the well cementation pocket after well is cemented the well.During production, oxygen or air and steam inject from injecting the well well head, and there is a duration and degree of heating at the perforation position of two mouthfuls of wells, oxygen or air and steam are flowed through and are put ember behind igniter head, through complicated redox reaction, produce the high-temperature gas mixture body, these gases are discharged from producing well.Generally; the temperature of these mists is all more than 600 °; be easy to make the sleeve pipe of producing well to damage; high temperature has also quickened the chemical reaction of sleeve pipe and mist simultaneously; have a strong impact on the application life and the ordinary production of producing well; therefore the protection of the pit shaft of producing well becomes underground coal gasification(UCG) production key of success, the pit shaft protective device that must setting can satisfy the worst hot case requirement, protect wellbore casing to be without prejudice.

Summary of the invention:

The object of the invention is to provide a kind of well casing protecting equipment for deep coal underground gasification production well that can avoid high temperature sleeve pipe to be damaged, effectively protects wellbore casing, assurance deep coal underground gasification producing well ordinary production.

Technical scheme of the present invention is as follows: this kind pit shaft protective device is by little step in the band φ 244.5mm; the outer little step of φ 177.8mm; four forming of the outer little step of little step and φ 139.7mm in the φ 177.8mm with little step with a φ 177.8mm short sleeve that is equipped with eyelet; little step short sleeve in the φ 244.5mm; the outer little step short sleeve of φ 139.7mm is connected to φ 244.5mm sleeve pipe; φ 139.7mm sleeve pipe lower end; φ 177.8mm punching short sleeve is connected φ 177.8mm sleeve pipe lower end, the outer little step short sleeve of φ 177.8mm; little step short sleeve is connected to φ 177.8mm punching short sleeve lower end in the φ 177.8mm.Wherein, the outer little step short sleeve inwall of little step short sleeve and φ 177.8mm is provided with and has little step that mutual inversion cooperates the scalene cone transition in the φ 244.5mm, little step short sleeve in the φ 177.8mm band, be respectively equipped with on the outer little step short sleeve periphery of φ 139.7mm band and have little step that mutual inversion cooperates the scalene cone transition, the scalene cone section geomery of two groups of inside and outside little step short sleeves of the band that matches is identical, be inverted mutually and cooperate, constitute the seal section of two annular spaces, be evenly equipped with the cooling water circulation port on the tube wall of φ 177.8mm punching short sleeve bottom, make to constitute between two annular spaces to be communicated with.When above 5 short sleeves with the sleeve pipe of correspondingly-sized separately respectively lower going-into-well down after; because two groups have cooperatively interacting of inside and outside little step short sleeve scalene cone section; can be respectively between φ 244.5mm and φ 177.8mm sleeve pipe and between φ 177.8mm and the φ 139.7mm sleeve pipe, form two annular spaces that are communicated with; when coal gasification is produced; open on the well head christmas tree four-way; following two gates; the recirculated cooling water that enters from well head can flow in the annular space of two connections; play hydronic effect, thereby reach cooling and protect pit shaft to avoid the purpose that high temperature injury increases the service life.

Pit shaft protective device provided by the invention is reasonable in design; simple in structure; easy to implement; utilize it can avoid the destruction of high temperature, effectively protect pit shaft, guarantee deep coal underground gasification producing well ordinary production sleeve pipe; simultaneously; temperature rose when recirculated cooling water arrived ground, had become hot water, can be used as thermal source and was used.

Description of drawings:

Accompanying drawing is well casing protecting equipment for deep coal underground gasification production well structure provided by the invention and working state schematic representation thereof.Among the figure, label " 6 ", " 7 " are respectively φ 177.8mm well head christmas tree four-way and φ 244.5mm christmas tree four-way, label " 8 ", " 9 " are respectively cooling water and enter hole and outlet, label " 10 ", " 11 ", " 12 " are respectively φ 244.5mm sleeve pipe, φ 177.8mm sleeve pipe and φ 139.7mm sleeve pipe, label " 13 ", " 14 " are respectively the circulation port of cooling water and φ 177.8mm short sleeve 1, label " 15 " is the coal seam, and label " 16 " is a mixed gas outlet.

Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 are respectively little step short sleeve in little step short sleeve in the φ 244.5mm band, the outer little step short sleeve of φ 177.8mm band, the φ 177.8mm band, the outer little step short sleeve of φ 139.7mm band and φ 177.8mm punching short sleeve structural representation.

The specific embodiment:

The present invention is provided by following examples, below in conjunction with accompanying drawing the present invention is further described.

As shown in Figure 1, the present invention is by φ 177.8mm punching short sleeve 5, little step short sleeve 1 in the φ 244.5mm, the outer little step short sleeve 2 of φ 177.8mm, little step short sleeve 3 in the φ 177.8mm, the outer little step short sleeve 4 of φ 139.7mm is formed, its structure, assembled relation is as follows: little step short sleeve 1 in the φ 244.5mm, the outer little step short sleeve 4 of φ 139.7mm is connected to φ 244.5mm sleeve pipe 10, φ 139.7mm sleeve pipe 12 lower ends, φ 177.8mm punching short sleeve 5 is connected φ 177.8mm sleeve pipe 11 lower ends, the outer little step short sleeve 2 of φ 177.8mm, little step short sleeve 3 is connected to φ 177.8mm punching short sleeve 5 lower ends in the φ 177.8mm.Wherein, little step short sleeve 1 (Fig. 2) in the φ 244.5mm, little step short sleeve 3 (Fig. 4) inwall is provided with little step of the up big and down small scalene cone transition of band internal diameter in the φ 177.8mm, the outer little step short sleeve 2 (Fig. 3) of φ 177.8mm band, be respectively equipped with little step of the up big and down small scalene cone transition of band external diameter on outer little step short sleeve 4 (Fig. 5) periphery of φ 139.7mm band, the scalene cone section of two groups of inside and outside little step short sleeves of the band that matches is measure-alike, be inverted mutually and cooperate, constitute the seal section of two annular spaces, be evenly equipped with the cooling water circulation port on the tube wall of φ 177.8mm punching short sleeve bottom, make to constitute between two annular spaces to be communicated with.

Claims

1, a kind of well casing protecting equipment for deep coal underground gasification production well, by little step short sleeve (1) in the φ 244.5mm, the outer little step short sleeve (2) of φ 177.8mm, little step short sleeve (3) in the φ 177.8mm, the outer little step short sleeve (4) of φ 139.7mm, φ 177.8mm punching short sleeve (5) is formed, it is characterized in that: little step short sleeve (1) in the φ 244.5mm, the outer little step short sleeve (4) of φ 139.7mm is connected to φ 244.5mm sleeve pipe (10), φ 139.7mm sleeve pipe (12) lower end, φ 177.8mm punching short sleeve (5) is connected φ 177.8mm sleeve pipe (11) lower end, the outer little step short sleeve (2) of φ 177.8mm, little step short sleeve (3) is connected to φ 177.8mm punching short sleeve (5) lower end in the φ 177.8mm; Wherein, little step short sleeve (1) in the φ 244.5mm, little step short sleeve (3) inwall is provided with little step of the up big and down small scalene cone transition of band internal diameter in the φ 177.8mm, the outer little step short sleeve (2) of φ 177.8mm band, be respectively equipped with little step of the up big and down small scalene cone transition of band external diameter on outer little step short sleeve (4) periphery of φ 139.7mm band, the scalene cone section of two groups of inside and outside little step short sleeves of the band that matches is measure-alike, be inverted mutually and cooperate, constitute the seal section of two annular spaces, be evenly equipped with the cooling water circulation port on the tube wall of φ 177.8mm punching short sleeve bottom, make to constitute between two annular spaces to be communicated with.