CN104563874A - Underground gasification well cementing method and well structure - Google Patents
Underground gasification well cementing method and well structure Download PDFInfo
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- CN104563874A CN104563874A CN201410820229.XA CN201410820229A CN104563874A CN 104563874 A CN104563874 A CN 104563874A CN 201410820229 A CN201410820229 A CN 201410820229A CN 104563874 A CN104563874 A CN 104563874A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Abstract
The invention relates to an underground gasification well cementing method and a well structure. The method comprises the following steps: descending a well-cementing sleeve into a well, stopping descending the well-cementing sleeve until the bottom end of the well-cementing sleeve enters into a coal seam for a set depth, and connecting the well-cementing sleeve with the well wall of the well, wherein the well-cementing sleeve at least comprises a flexible sleeve, the bottom end of the telescopic flexible sleeve forms a bottom end of the well-cementing sleeve, and the length of the telescopic flexible sleeve is greater than or equal to the sum of the maximum height of a water diversion fissure zone above the coal seam and the set depth. The well structure comprises a well which is communicated with the coal seam from the ground and the well-cementing sleeve, wherein the well-cementing sleeve is connected with the well wall of the well; the well-cementing sleeve comprises the telescopic flexible sleeve, the bottom end of the telescopic flexible sleeve is positioned at the set depth of the coal seam, and the length of the telescopic flexible sleeve is greater than or equal to the sum of the maximum height of the water diversion fissure zone above the coal seam and the set depth. The method and the well structure are capable of preventing well-cementing sleeve breakage caused by fissure of stratum above the coal seam in each direction.
Description
Technical field
The present invention relates to underground coal gasification(UCG) field, particularly relate to a kind of underground gasification cementing method and a kind of well construction.
Background technology
In underground gasification, oil field development, coal-bed gas exploitation, because the reasons such as well cementing casing pipe lowering operation is improper, geostatic stress change, down-hole adverse circumstances corrosion cause the generation of the failure phenomenons such as well cementing casing pipe damage, burn into fracture.Wherein, owing to carrying out hydraulic fracturing to destination layer position, suppress and increase gap, heat, adopt the operations such as empty, destination layer to be sprained pressure and rise or lose and support and sink with overlying strata topping up, causes well cementing casing pipe to be extruded distortion, even rupture, drilling well can not normally be used.In underground coal gasification(UCG), owing to needing to produce rock stratum around a large amount of energy heats coal seam to subterranean coal injected gas agent, coal combustion gasification, leave the factors such as huge burned out area because of coal combustion, coal seam is made to be more prone to cracking with overlying strata, to subside, and then cause the STRESS VARIATION on this section of stratum, the well cementing casing pipe being in this section of stratum is damaged because of reservoir stress change or ruptures, and this phenomenon seemed more outstanding in the well cementing casing pipe of underground gasification loses efficacy.Wherein, the stratum occurring to ftracture and subside is called water flowing fractured zone.In specific words, the part rock stratum that the coal seam top covering rockmass caused after working face extraction is caving completely is called caving zone.On caving zone a large amount of occur cut layer, absciss layer and fracture gap or fracture extension zone is called fissure zone, caving zone and fissure zone are collectively referred to as water flowing fractured zone.
Patent CN101158272 discloses a kind of oil well shearing type casing tube break prevention compensation pipe, mainly adopt splice sleeve box cupling on inner pipe, and connect with upper sleeve, interior pipe is placed in outer tube, in the middle of outer tube and interior pipe, joint ring and spring are installed, and on top, pin is housed, outer tube lower end connects with lower contact, and lower contact connects down-hole pipe.When stratum rises, in telescoping tube, pipe departs from, and slide a segment distance, can prevent casing failure, and oil well still can keep safety in production.But above-mentioned patent does not have effect for the casing failure caused because of the stratum changing of the relative positions (changing of the relative positions of non-above-below direction).
Summary of the invention
The object of the present invention is to provide a kind of underground gasification cementing method and a kind of well construction, it can prevent the changing of the relative positions in all directions of the stratum above because of coal seam and the fracture of the well cementing casing pipe caused.
For achieving the above object, one aspect of the present invention provides a kind of underground gasification cementing method, in the building process of well being passed into coal seam by ground or after building, perform following well cementing casing pipe setting steps: Xiang Jingzhong transfers well cementing casing pipe, until the bottom of well cementing casing pipe stops after entering coal seam set depth, and well cementing casing pipe is connected with the borehole wall of well; Wherein, well cementing casing pipe at least comprises retractable and flexible sleeve pipe, the bottom of retractable and flexible sleeve pipe forms the bottom of well cementing casing pipe, and the length of retractable and flexible sleeve pipe be more than or equal to the maximum height of the water flowing fractured zone above coal seam and set depth and value.
According to the present invention, before execution well cementing casing pipe setting steps, to be faced down drilling well be drilled into the below of set depth by ground; In well cementing casing pipe setting steps: cement the well by injecting well cementing material to gap between well and well cementing casing pipe, so that well cementing casing pipe is connected with the borehole wall; Continue to creep into until it is drilled into the precalculated position in coal seam well.
According to the present invention, well cementing casing pipe also comprises petroleum casing pipe, and the top of retractable and flexible sleeve pipe is connected with the bottom of petroleum casing pipe.
According to the present invention, the length of retractable and flexible sleeve pipe is greater than the maximum height of water flowing fractured zone and set depth and value, and be less than or equal to 15 meters with the difference with value.
According to the present invention, set depth equals the 1/5-1/3 of coal seam thickness.
According to the present invention, retractable and flexible sleeve pipe is bellows.
According to the present invention, it is metal bellows or corrugated pipe made of compound material that bellows has arbitrary or any combination feature: a, bellows as follows; The compressive strength of b, bellows is more than or equal to 20MPa; C, bellows are heat resisting temperature is more than 350 DEG C.
According to the present invention, the inclination angle in coal seam is positioned at the scope of 0 °-54 ° or 55 °-85 °.
Another aspect of the present invention provides a kind of well construction, comprising: pass into the well in coal seam by ground and be connected to the well cementing casing pipe of the borehole wall of well; Well cementing casing pipe comprises retractable and flexible sleeve pipe, and the bottom of retractable and flexible sleeve pipe is arranged in the set depth place in coal seam, and the length of retractable and flexible sleeve pipe be more than or equal to the maximum height of the water flowing fractured zone above coal seam and set depth and value.
According to the present invention, well cementing casing pipe also comprises petroleum casing pipe; The bottom of petroleum casing pipe is connected with the top of retractable and flexible sleeve pipe.
According to the present invention, the length of retractable and flexible sleeve pipe is greater than the maximum height of water flowing fractured zone and set depth and value, and be less than or equal to 15 meters with the difference with value.
Compared to prior art, beneficial effect of the present invention is:
Underground gasification cementing method of the present invention, in the building process of the well being passed into coal seam by ground or after building, Xiang Jingzhong transfers well cementing casing pipe, until the bottom of well cementing casing pipe stops after entering coal seam set depth, and is connected with the borehole wall of well by well cementing casing pipe.Wherein, well cementing casing pipe at least comprises bellows, and the bottom of bellows forms the bottom of well cementing casing pipe, and the length of the bellows maximum height that is more than or equal to the water flowing fractured zone above coal seam and set depth and value, to make bellows covering water flowing fractured zone.Thus, after coal combustion forms burned out area, owing to defining water conductive fault in water flowing fractured zone, in water conductive fault, there is underground water to pass through, this region rock stratum stability is caused to decline, the easy formation stratum changing of the relative positions, length due to retractable and flexible sleeve pipe retractable and flexible sleeve pipe 31 uses the maximum height of water flowing fractured zone in the calculation, therefore it is enough to make the water flowing fractured zone of actual generation by retractable and flexible sleeve covers, and then make the stratum within the scope of water flowing fractured zone no matter be where upwards the changing of the relative positions is occurring, retractable and flexible sleeve pipe all can move along with the connected borehole wall together, thus can not rupture.Namely the present invention can prevent the changing of the relative positions in all directions of the stratum above because of coal seam and the fracture of the well cementing casing pipe caused.Such as, if (longitudinal direction) changing of the relative positions up and down occurs on stratum, then retractable and flexible sleeve pipe can follow ground movement in a telescopic manner.Again such as, if left and right (transverse direction) changing of the relative positions occurs on stratum, then retractable and flexible sleeve pipe can follow ground movement in bending mode.Or when there is the changing of the relative positions in above-mentioned two kinds of directions, retractable and flexible sleeve pipe can follow ground movement in flexible or bending mode simultaneously simultaneously.To sum up, the present invention and then avoid because well cementing casing pipe fracture that the well that causes can not normally use, and the reduction of underground gasification effect caused thus or the failure of underground gasification.
Well construction of the present invention, comprises and passes into the well in coal seam by ground and be connected to the well cementing casing pipe of the borehole wall of well.Well cementing casing pipe comprises retractable and flexible sleeve pipe, the bottom of retractable and flexible sleeve pipe is arranged in the set depth place in coal seam, and the length of retractable and flexible sleeve pipe is more than or equal to the maximum height of the water flowing fractured zone above coal seam and set depth and value, covers water flowing fractured zone to make bellows.Thus, after coal combustion forms burned out area, owing to defining water conductive fault in water flowing fractured zone, in water conductive fault, there is underground water to pass through, this region rock stratum stability is caused to decline, the easy formation stratum changing of the relative positions, length due to retractable and flexible sleeve pipe 31 retractable and flexible sleeve pipe uses the maximum height of water flowing fractured zone in the calculation, therefore it is enough to make the water flowing fractured zone of actual generation be covered by bellows, and then make the stratum within the scope of water flowing fractured zone no matter be where upwards the changing of the relative positions is occurring, retractable and flexible sleeve pipe all can move along with the connected borehole wall together, thus can not rupture.Namely the present invention can prevent the changing of the relative positions in all directions of the stratum above because of coal seam and the fracture of the well cementing casing pipe caused.Such as, if (longitudinal direction) changing of the relative positions up and down occurs on stratum, then retractable and flexible sleeve pipe can follow ground movement in a telescopic manner.Again such as, if left and right (transverse direction) changing of the relative positions occurs on stratum, then retractable and flexible sleeve pipe can follow ground movement in bending mode.Or when there is the changing of the relative positions in above-mentioned two kinds of directions, retractable and flexible sleeve pipe can follow ground movement in flexible or bending mode simultaneously simultaneously.To sum up, the present invention and then avoid because well cementing casing pipe fracture that the well that causes can not normally use, and the reduction of underground gasification effect caused thus or the failure of underground gasification.
Accompanying drawing explanation
Fig. 1 is a kind of underground gasification cementing method schematic diagram of embodiments of the invention;
Fig. 2 is the another kind of underground gasification cementing method schematic diagram of embodiments of the invention.
Detailed description of the invention
Embodiment of the invention will be described with reference to drawings as follows.
See Fig. 1, provide an embodiment of underground gasification cementing method of the present invention in the present embodiment, it is for the gasification of subterranean coal.
In the method for the present embodiment, in the building process of well 2 being passed into coal seam 1 by ground or after building, perform following well cementing casing pipe 3 setting steps: in well 2, transfer well cementing casing pipe 3, until the bottom of well cementing casing pipe 3 stops after entering coal seam 1 set depth, and the borehole wall of well cementing casing pipe 3 with well 2 is connected.Wherein, well cementing casing pipe 3 at least comprises retractable and flexible sleeve pipe 31, the bottom of retractable and flexible sleeve pipe 31 forms the bottom of well cementing casing pipe 3, and the length of retractable and flexible sleeve pipe 31 be more than or equal to the maximum height of the water flowing fractured zone 4 above coal seam 1 and set depth and value.
Thus, after burning and form burned out area in coal seam 1, when there is the changing of the relative positions in the stratum above coal seam 1, when namely forming water flowing fractured zone 4, length due to retractable and flexible sleeve pipe 31 uses the maximum height of water flowing fractured zone in the calculation, therefore it is enough to make the water flowing fractured zone 4 of actual generation to be covered by retractable and flexible sleeve pipe 31, and then make the stratum in water flowing fractured zone 4 scope no matter be where upwards the changing of the relative positions is occurring, retractable and flexible sleeve pipe 31 all can move along with the connected borehole wall together, thus can not rupture.Namely the present invention can prevent the changing of the relative positions in all directions of the stratum above because of coal seam 1 and the fracture of the well cementing casing pipe 3 caused.Such as, if (longitudinal direction) changing of the relative positions up and down occurs on stratum, then retractable and flexible sleeve pipe 31 can follow ground movement in a telescopic manner.Again such as, if left and right (transverse direction) changing of the relative positions occurs on stratum 1, then retractable and flexible sleeve pipe 31 can follow ground movement in bending mode.Or when there is the changing of the relative positions in above-mentioned two kinds of directions, retractable and flexible sleeve pipe 31 can follow ground movement in flexible or bending mode simultaneously simultaneously.To sum up, the present invention and then avoid the well caused because well cementing casing pipe 3 ruptures and can not normally use, and the reduction of underground gasification effect caused thus or the failure of underground gasification.
Particularly, with further reference to Fig. 1, in the present embodiment, coal seam 1 is arranged in the coalfield of Inner Mongol, in the present embodiment, sets up herein carry out underground coal gasification(UCG) production coal gas without well formula coal underground gasifying furnace by boring.
First, the basic geological information obtaining this coal seam 1 is explored to this coal seam 1.Basic geological information at least comprises: this coal seam 1 is with the compressive strength of mantlerock, seam inclination, the coal layering number of plies.And, inclination angle is arranged in the coal seam (coal seam see Fig. 1) of the scope of 0 °-54 °, basic geological information also comprise coal seam accumulative adopt thick, and inclination angle being arranged in the coal seam (coal seam see Fig. 2) of the scope of 55 °-85 °, basic geological information also comprises coal seam thickness and the coal-face little stage hangs down high.The method of exploring above-mentioned basic geological information is known to the skilled person, therefore is not described in detail at this.By above-mentioned exploration, as shown in Figure 1, the balkstone in coal seam 1 is argillaceous sandstone, then is up clay rock bed, chiltern aquifer, rammell, shallow soil layer, earth's surface etc.The compressive strength of argillaceous sandstone is between 25 ~ 35MPa.This coal seam 1 is horizontal seam (namely the inclination angle in this coal seam is 0 °), and this coal seam 1 is individual layer coal seam.Wherein, buried depth 350 meters, the thickness in coal seam 1 is at 7 meters.
Then, according to basic geological information, calculate this coal seam 1 when forming burned out area after gasification, the maximum height of the water flowing fractured zone 4 that may occur.Above-mentioned calculating is see table 1.
The empirical formula of table 1 water flowing fractured zone maximum height
Wherein, 1, this table 1 draws " mine hydrogeology code " (the trying) of formulating from Ministry of Coal Industry.
2, M-accumulative adopts thick, m; N-coal layering number of plies; M-coal seam thickness, m; H-work plane little stage hangs down high, m.
3, water flowing fractured zone maximum height, to gentle dip and inclined seam, means the normal direction height counted from coal seam end face; For half-edge coal seam, mean the vertical height counted from mining up per limit.
4, compressive strength of rock is saturated single shaft ultimate strength.
According to prospected basic geological information, can all gasify by individual layer coal is thick, namely coal seam 1 adds up to adopt thick is 7 meters, and the coal layering number of plies is 1, and compressive strength is between 25 ~ 35MPa.According to above-mentioned numerical value, corresponding formula (below listed formula) in option table 1:
The maximum height being obtained water flowing fractured zone 4 by this formulae discovery is 103.7 meters.And consider that underground gasification is in coal seam 1, carry out combustion gasification, combustion zone (that is: goaf) temperature is higher, to goaf with obviously a lot of than during pit mining of the heat effect of overlying strata, can accelerate the growth of water flowing fractured zone 4.And lime-ash and spoil are trapped in the underground space and play certain filling effect after considering underground gasification, above-mentioned heat effect and filling effect offset.So time, the length of retractable and flexible sleeve pipe 31 equals maximum height and the set depth H sum of water flowing fractured zone.Certainly, in other alternative-embodiments, according to the actual conditions in this coal seam, can consider that underground gasification is detained underground to coal seam 1 with the heat effect of mantlerock, lime-ash and spoil and plays the factors such as filling roof supporting to goaf, by the length of retractable and flexible sleeve pipe 31 on the basis of the maximum height and set depth H sum that equal water flowing fractured zone, then increase at most the increment of 15 meters.The i.e. length of retractable and flexible sleeve pipe 31 of the present invention, according to actual conditions, maximum height and the set depth H sum of water flowing fractured zone can be equaled, also can be greater than the maximum height of water flowing fractured zone and set depth H sum and be less than or equal to 15 meters with the difference of this and value.Wherein, the increment of 15 meters " increase at most " can be regarded as growth for water flowing fractured zone accelerated after, the affluence amount that increase of height on the basis of its maximum height of water flowing fractured zone.
In addition, set depth H is the degree of depth that the bottom of retractable and flexible sleeve pipe 31 is arranged in coal seam.The numerical value of this set depth H, by this area, staff chooses according to actual needs, can play enough supporting roles when coal combustion to meet retractable and flexible sleeve pipe 31 to the borehole wall.Preferably, set depth equals the 1/5-1/3 of coal seam thickness, and the coal seam thickness of the present embodiment is 7 meters, therefore set depth is positioned at the scope of 7/5-7/3 rice.In the present embodiment, set depth H is selected to equal 2 meters.
To sum up, in the present embodiment, the length of retractable and flexible sleeve pipe 31 equals the maximum height of water flowing fractured zone 4 (103.7 meters) and set depth H (2 meters) sum, is 105.7 meters.
After the length having calculated retractable and flexible sleeve pipe, select suitable retractable and flexible sleeve pipe according to this length.Wherein, retractable and flexible sleeve pipe can be bellows or is connected to each other by bellows and flexible pipe and formed.That is, when retractable and flexible sleeve pipe entirety is bellows, the longitudinal changing of the relative positions of bellows simultaneous adaptation in coal seam and the horizontal changing of the relative positions; When retractable and flexible sleeve pipe comprises bellows and flexible pipe, bellows is that flexible sleeve provides scalability to be adapted to longitudinal changing of the relative positions in coal seam, and bellows and flexible pipe simultaneous adaptation are in the horizontal changing of the relative positions in coal seam.Certainly, the present invention is not limited to this, by any, retractable and flexible sleeve pipe can well known to a person skilled in the art that the materials and structures with scalability and flexible is formed.
In the present embodiment, retractable and flexible sleeve pipe 31 is bellows, and this bellows is metal bellows further, and its compressive strength equals 40MPa, and heat resisting temperature is 350 DEG C.Certainly, the present invention is not limited to this, bellows can also be corrugated pipe made of compound material, the aluminum foil corrugated pipe such as, be composited by the multiple material such as glass fiber, aluminium foil in prior art or steel strip reinforced spiral steel plastic compount bellows etc., and the compressive strength of bellows can also for being more than or equal to other values of the removing 40MPa in the scope of 20MPa, the heat resisting temperature of bellows can also for the temperature value being greater than 350 DEG C.
Can understand, any retractable and flexible sleeve pipe 31 that can play well cementation effect and move together when also all directions changing of the relative positions occurs on stratum around thereupon, all can use in the present invention.Preferably, this retractable and flexible sleeve pipe 31 is bellows, and more preferably metal bellows or corrugated pipe made of compound material.Retractable and flexible sleeve pipe 31 compressive strength is more than or equal to 20MPa, and heat resisting temperature is more than or equal to 350 DEG C.
So far, have selected retractable and flexible sleeve pipe 31.
After this, to be faced down drilling well be drilled into the below of the set depth H in coal seam by ground.That is, in the present embodiment, to be faced down drilling well by ground, until shaft bottom enter into 2 meters, coal seam sentence under part.This step is the establishment step of well 2, and whole foundation of not yet completed well 2.
In addition, adopted in the present embodiment well cementing casing pipe 3 comprises petroleum casing pipe 32 and retractable and flexible sleeve pipe 31.By petroleum casing pipe 32 and retractable and flexible sleeve pipe 31 by well known to a person skilled in the art that mode (such as welding, screwed connection, flange connection etc.) links together.Particularly, with reference to the orientation in Fig. 1, be direction from top to bottom with the direction in sensing coal seam, ground, placed along direction from top to bottom by well cementing casing pipe 3, well cementing casing pipe 3 has the top and bottom that are oppositely arranged, and petroleum casing pipe 32 has the top and bottom that are oppositely arranged, retractable and flexible sleeve pipe 31 has the top and bottom that are oppositely arranged, and in above-mentioned all " top and bottom ", top is positioned at the top of bottom, be namely direction from top to bottom by the direction of sensing bottom, top.In the present embodiment, when well cementing casing pipe is in above-mentioned location, the top of retractable and flexible sleeve pipe 31 is connected with the bottom of petroleum casing pipe 32, and now namely the bottom of retractable and flexible sleeve pipe 31 forms the bottom of well cementing casing pipe 3, and namely the top of petroleum casing pipe 32 forms the top of well cementing casing pipe 3.
Afterwards, following well cementing casing pipe setting steps is performed.
Step 1: transfer well cementing casing pipe 3 in well 2, stops after set depth H until the bottom of well cementing casing pipe 3 (i.e. the bottom of telescopic flexible sleeve 31) enters in coal seam 1.That is, the end face of the bottom (i.e. the bottom of telescopic flexible sleeve 31) of well cementing casing pipe 3 is arranged in set depth H place, coal seam 1.In other words, be the pipeline section that retractable and flexible sleeve pipe 31 has 2 meters long in the present embodiment and be arranged in coal seam 1.
Step 2: cement the well, so that well cementing casing pipe 3 is connected with the borehole wall by injecting well cementing material to gap between well 2 and well cementing casing pipe 3.In the present embodiment, in well 2, inject cement paste (i.e. well cementing material) carry out returning slurry well cementation, well cementing casing pipe 3 is connected with the borehole wall.Can understand, in the process of above-mentioned drilling well, well is drilled into the below of set depth H in coal seam 1, and the bottom of retractable and flexible sleeve pipe 31 is transferred set depth H place to coal seam 1 in above-mentioned steps 1, and now there is a segment distance in the distance shaft bottom, bottom of retractable and flexible sleeve pipe 31.Make when injecting cement paste in well 2, cement paste flows through from well cementing casing pipe 3 inside, until flow to shaft bottom, and upwards flowed by the annular space between the borehole wall and the periphery wall of well cementing casing pipe 3, the annular space between the borehole wall and the periphery wall of well cementing casing pipe 3 stops injecting cement paste after being full of cement paste.After cement slurry sets, the borehole wall of well cementing casing pipe 3 with well 2 is fixedly connected with by it.Above are only the concise and to the point description returning slurry well cementation, what the present embodiment used returns the method for starching well cementation is well known to a person skilled in the art, therefore is no longer described in detail.Certainly, well cementing material is not limited to cement paste, also can comprise and well known to a person skilled in the art other materials.Further, in other optional embodiment, also cement the well by other cementing method, and be not limited to above-mentioned return slurry well cementation.
So far, well cementing casing pipe setting steps completes.
Then, continue to creep into until it is drilled into the precalculated position in coal seam 1 to well 2, in the present embodiment, precalculated position is the base plate in coal seam 1.Certainly, the present invention is not limited to this, and in other alternative-embodiments, precalculated position is determined according to actual needs.Such as, this well 2, after all setting up, it can be used as the air inlet well of underground gasification or goes out gas well, therefore the position of the gasification tunnel arranged in coal seam as required, determines air inlet well or goes out the position in shaft bottom of gas well, and then determines the position in shaft bottom of well 2.The position in the shaft bottom of this well 2 is in above-mentioned " precalculated position ".
So far, well 2 has all been set up.
Can understand, in the present embodiment, well cementing casing pipe setting steps performs in the process of establishing of well 2, and carry out returning slurry well cementation by means of the foundation of well 2.Certainly, in other alternative-embodiments, well cementing casing pipe setting steps can perform after well 2 has all been set up, and the borehole wall of well cementing casing pipe 3 with well 2 is connected by method to select other well known to a person skilled in the art according to actual conditions.
Alternatively, after well 2 is set up completely, carry out well-flushing, and/or simple supporting is carried out to the borehole wall being positioned at retractable and flexible sleeve pipe less than 31.
To sum up, stretch into position in coal seam 1 by the bottom presetting retractable and flexible sleeve pipe 31 and calculate the length of retractable and flexible sleeve pipe 31 according to the maximum height of water flowing fractured zone and the above-mentioned position stretched in coal seam 1, retractable and flexible sleeve pipe 31 can be made just in time to cover after being connected to the borehole wall may the dynamic water flowing fractured zone scope of spot fault.Thus, ensure that the above-mentioned beneficial effect mentioned.
With reference to Fig. 2, second embodiment of underground gasification cementing method of the present invention.Repeat no more with the something in common of above-mentioned embodiment illustrated in fig. 1.
Gasify in the coal seam of the present embodiment to Ningxia.Through exploration, this coal seam is half-edge coal seam 1, and the inclination angle in this coal seam 1 is between 60 ~ 65 °, and coal seam 1 buried depth 460 meters, coal seam 1 is mingled with three layers of thin dirt band, and the thickness in coal seam 1 is 12 meters.Coal seam 1 roof strata is arenaceous shale, and compressive strength is about 30Mpa (being less than 40Mpa), and roof strata is up moisture mud stone, shale, limestone, basalt, shallow-layer loess, earth's surface again.In underground gasification process, the coal seam 1 containing thin dirt band can be gasified totally, and then coal seam 1 is divided into 4 layers containing three layers of dirt band, and when arranging underground gasification passage along coal seam 1 inclination direction, the gasification coal-face little stage high h that hangs down can reach 26 meters.
Comprehensive above geological information, the formula (for following formula) of the maximum height of water flowing fractured zone 4 is chosen according to table 1:
The maximum height calculating water flowing fractured zone 4 is 103.9 meters, consider that underground gasification carries out combustion gasification in coal seam 1, combustion zone (that is: goaf) temperature is higher, to goaf with obviously a lot of than during pit mining of the heat effect of overlying strata, the growth of water flowing fractured zone 4 can be accelerated, by the length of retractable and flexible sleeve pipe 31 on the basis of the maximum height and set depth H sum that equal water flowing fractured zone, increase the increment of 13 meters.To sum up, in the present embodiment, the length of retractable and flexible sleeve pipe 31 be 118.9 meters (maximum height of water flowing fractured zone 4 is 103.9 meters, set depth 2 meters and increment 13 meters of sums).
After the length of retractable and flexible sleeve pipe 31 is determined, select suitable retractable and flexible sleeve pipe 31.In the present embodiment, retractable and flexible sleeve pipe 31 is metal bellows, and its compressive strength equals 40MPa, can bear the temperature of 350 DEG C.
It should be pointed out that the zequin of set depth H can select any point at the upper surface place, coal seam be connected with well cementing casing pipe because coal seam tilts.In other words, the distance differed between the highs and lows of the upper surface in the coal seam be connected due to well cementing casing pipe is little, and in the two, any point all can not affect the enforcement of this method and the realization of beneficial effect as the zequin of set depth H.
Because the retractable and flexible sleeve pipe in well cementing casing pipe of the present invention can follow the stratum changing of the relative positions in all directions effectively, therefore relative to prior art, to the coal seam with certain angle of inclination (gradient is greater than 0), there is more significant beneficial effect.
The present invention additionally provides a kind of well construction on the other hand, and wherein, Fig. 1 and Fig. 2 respectively illustrates two embodiments of well construction of the present invention simultaneously.
Well construction illustrated in fig. 1, comprising: pass into the well 2 in coal seam 1 by ground and be connected to the well cementing casing pipe 3 of the borehole wall of well 2.Wherein, well cementing casing pipe 3 comprises retractable and flexible sleeve pipe 31, the bottom of retractable and flexible sleeve pipe 31 is arranged in the set depth H place in coal seam 1, and the length of retractable and flexible sleeve pipe 31 be more than or equal to the maximum height of the water flowing fractured zone 4 above coal seam 1 and set depth H's and value.
Thus, after burning and form burned out area in coal seam 1, owing to defining water conductive fault in water flowing fractured zone, in water conductive fault, there is underground water to pass through, this region rock stratum stability is caused to decline, the easy formation stratum changing of the relative positions, length due to retractable and flexible sleeve pipe 31 is enough to water flowing fractured zone 4 is covered by retractable and flexible sleeve pipe 31, and then make the stratum in water flowing fractured zone 4 scope no matter be where upwards the changing of the relative positions is occurring, retractable and flexible sleeve pipe 31 all can move along with the connected borehole wall together, thus can not rupture.Namely the present invention can prevent the changing of the relative positions in all directions of the stratum above because of coal seam 1 and the fracture of the well cementing casing pipe 3 caused.Such as, if (longitudinal direction) changing of the relative positions up and down occurs on stratum, then retractable and flexible sleeve pipe 31 can follow ground movement in a telescopic manner.Again such as, if left and right (transverse direction) changing of the relative positions occurs on stratum, then retractable and flexible sleeve pipe 31 can follow ground movement in bending mode.Or when there is the changing of the relative positions in above-mentioned two kinds of directions, retractable and flexible sleeve pipe 31 can follow ground movement in flexible or bending mode simultaneously simultaneously.To sum up, the present invention and then avoid the well caused because well cementing casing pipe 3 ruptures and can not normally use, and the reduction of underground gasification effect caused thus or the failure of underground gasification.
Particularly, in the present embodiment, well cementing casing pipe 3 also comprises petroleum casing pipe 32.The bottom of petroleum casing pipe 32 is connected with the top of retractable and flexible sleeve pipe 31.That the length of retractable and flexible sleeve pipe 31 equals the maximum height of water flowing fractured zone 4 and set depth and value.Wherein, set depth H equals 2 meters.The length of retractable and flexible sleeve pipe 31 equals maximum height (103.7 meters) and set depth H (2 meters) sum of water flowing fractured zone 4, is 105.7 meters.Retractable and flexible sleeve pipe 31 is metal bellows, and compressive strength equals 40MPa, and heat resisting temperature is 350 DEG C.In the present embodiment, above-mentioned have the feature of closing well 2, well cementing casing pipe (comprising retractable and flexible sleeve pipe, petroleum casing pipe and their connected mode) and well 2 and the connected mode of well cementing casing pipe 3 and other do not describe have the feature of closing well 2 and well cementing casing pipe with above-mentioned based on the underground gasification cementing method described by Fig. 1 in described feature consistent, therefore to repeat no more.
With reference to Fig. 2, another embodiment of well construction of the present invention,
Well construction illustrated in fig. 2, comprises and passes into the well 2 in coal seam 1 by ground and be connected to the well cementing casing pipe 3 of the borehole wall of well 2.Wherein, well cementing casing pipe 3 comprises retractable and flexible sleeve pipe 31, the bottom of retractable and flexible sleeve pipe 31 is arranged in the set depth H place in coal seam 1, and the length of retractable and flexible sleeve pipe 31 be more than or equal to the maximum height of the water flowing fractured zone 4 above coal seam 1 and set depth H's and value.
Particularly, in the present embodiment, well cementing casing pipe 3 also comprises petroleum casing pipe 32.The bottom of petroleum casing pipe 32 is connected with the top of retractable and flexible sleeve pipe 31.That the length of retractable and flexible sleeve pipe 31 equals the maximum height of water flowing fractured zone 4 and set depth and value.Wherein, set depth H equals 2 meters.The length of retractable and flexible sleeve pipe 31 equals the maximum height (103.9 meters) of water flowing fractured zone 4, set depth H (2 meters) and increment 13 meters of sums, is 105.7 meters.Retractable and flexible sleeve pipe 31 is metal bellows, and compressive strength equals 40MPa, and heat resisting temperature is 350 DEG C.In the present embodiment, above-mentioned have the feature of closing well 2, well cementing casing pipe (comprising retractable and flexible sleeve pipe, petroleum casing pipe and their connected mode) and well 2 and the connected mode of well cementing casing pipe 3 and other do not describe have the feature of closing well 2 and well cementing casing pipe with above-mentioned based on the underground gasification cementing method described by Fig. 2 in described feature consistent, therefore to repeat no more.
Certainly, be not limited to above-mentioned two embodiments, on the basis of above-mentioned two embodiments, the bottom of retractable and flexible sleeve pipe also can be connected with other sleeve pipes, to realize the required supporting requirement to the borehole wall.
Well cementing casing pipe in underground gasification cementing method of the present invention and well construction, is not limited to foregoing description, is also only made up of retractable and flexible sleeve pipe alternatively.
In addition, foregoing describes only the situation of seam inclination in the scope of 0 °-54 ° or in the scope of 55 °-85 °, when when seam inclination is in the scope of 54-55 °, can respectively according in the scope of 0 °-54 ° and select the maximum height of formulae discovery water flowing fractured zone in the scope of 55 °-85 °, the maximum height of the water flowing fractured zone as this coal seam that result of calculation is larger in both then adopting.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a underground gasification cementing method, is characterized in that,
In the building process of well (2) being passed into coal seam (1) by ground or after building, perform following well cementing casing pipe setting steps:
Well cementing casing pipe (3) is transferred in described well (2), stop afterwards until the bottom of described well cementing casing pipe (3) enters described coal seam (1) set depth (H), and the borehole wall of described well cementing casing pipe (3) with described well (2) is connected;
Wherein, described well cementing casing pipe (3) at least comprises retractable and flexible sleeve pipe (31), the bottom of described retractable and flexible sleeve pipe (31) forms the bottom of described well cementing casing pipe (3), and the length of described retractable and flexible sleeve pipe (31) is more than or equal to the maximum height (H of the water flowing fractured zone (4) of top, described coal seam (1)
f) with described set depth (H) and be worth.
2. underground gasification cementing method according to claim 1, is characterized in that,
Before the described well cementing casing pipe setting steps of execution, to be faced down drilling well be drilled into the below of described set depth (H) by ground;
In described well cementing casing pipe setting steps: cement the well by injecting well cementing material to gap between described well (2) and well cementing casing pipe (3), so that described well cementing casing pipe (3) is connected with the described borehole wall;
Continue to creep into until it is drilled into the precalculated position in described coal seam (1) described well (2).
3. underground gasification cementing method according to claim 1, is characterized in that,
Described well cementing casing pipe (3) also comprises petroleum casing pipe (32), and the top of described retractable and flexible sleeve pipe (31) is connected with the bottom of petroleum casing pipe (32).
4. underground gasification cementing method according to claim 1, is characterized in that,
The length of described retractable and flexible sleeve pipe (31) is greater than the maximum height (H of described water flowing fractured zone (4)
f) with described set depth (H) and be worth, and be less than or equal to 15 meters with described with difference that is value.
5. the underground gasification cementing method according to any one of claim 1-4, is characterized in that,
Described set depth (H) equals the 1/5-1/3 of coal seam thickness.
6. the underground gasification cementing method according to any one of claim 1-4, is characterized in that,
Described retractable and flexible sleeve pipe (31) is bellows.
7. underground gasification cementing method according to claim 6, is characterized in that,
Described bellows has arbitrary or any combination feature as follows:
A, described bellows are metal bellows or corrugated pipe made of compound material;
The compressive strength of b, described bellows is more than or equal to 20MPa;
C, described bellows are heat resisting temperature is more than 350 DEG C.
8. the underground gasification cementing method according to any one of claim 1-4, is characterized in that,
The inclination angle in described coal seam (1) is positioned at the scope of 0 °-54 ° or 55 °-85 °.
9. a well construction, comprising:
Pass into the well (2) of coal seam (1) by ground and be connected to the well cementing casing pipe (3) of the borehole wall of described well (2);
It is characterized in that,
Described well cementing casing pipe (3) comprises retractable and flexible sleeve pipe (31), the bottom of described retractable and flexible sleeve pipe (31) is arranged in set depth (H) place of described coal seam (1), and the length of described retractable and flexible sleeve pipe (31) is more than or equal to the maximum height (H of the water flowing fractured zone (4) of top, described coal seam (1)
f) with described set depth (H) and be worth.
10. well construction according to claim 9, is characterized in that,
Described well cementing casing pipe (3) also comprises petroleum casing pipe (32);
The bottom of described petroleum casing pipe (32) is connected with the top of described retractable and flexible sleeve pipe (31).
11. well constructions according to claim 9 or 10, is characterized in that,
The length of described retractable and flexible sleeve pipe (31) is greater than the maximum height (H of described water flowing fractured zone (4)
f) with described set depth (H) and be worth, and be less than or equal to 15 meters with described with difference that is value.
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| CN201410820229.XA CN104563874B (en) | 2014-12-24 | 2014-12-24 | Underground gasification cementing method, well construction |
| PCT/CN2015/091874 WO2016101680A1 (en) | 2014-12-24 | 2015-10-13 | Underground gasification well-cementing method and well structure |
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| CN104563874B (en) | 2017-03-01 |
| WO2016101680A1 (en) | 2016-06-30 |
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