CN102168538A - Method for pressurizing and filling upper part of shaft in well cementation later stage of underground gas storage well and device thereof - Google Patents
Method for pressurizing and filling upper part of shaft in well cementation later stage of underground gas storage well and device thereof Download PDFInfo
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- CN102168538A CN102168538A CN2011100714775A CN201110071477A CN102168538A CN 102168538 A CN102168538 A CN 102168538A CN 2011100714775 A CN2011100714775 A CN 2011100714775A CN 201110071477 A CN201110071477 A CN 201110071477A CN 102168538 A CN102168538 A CN 102168538A
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Abstract
The invention discloses a method for pressurizing and filling the upper part of a shaft in the well cementation later stage of an underground gas storage well and a device thereof. The filling method comprises the steps of: opening a filling hole with a flange on a surface pipe of a conventional gas storage well; starting a pressure pump of a pressurizing and filling device when the conventional well cementation construction of an underground gas storage well goes to the stage after cement paste for well cementation ascends to the earth surface or the stage before concrete paste for well cementation is initially set; and pressurizing and filling the cement paste prepared according to a conventional proportion into an annular cavity between a surface pipe and the shaft body of the gas storage well once or several times at the pressure of 0.5-2.0 MPa. The filling device comprises a paste preparation tank and a cement paste pressure filling device comprising the slurry pressure pump, a pressure stabilizing valve, a cement paste filling pipe with a flange head and a cement paste inlet pipe. The method and the device disclosed by the invention have the characteristics that the combining strength of cement paste and the shaft body can be greatly improved; the corrosion of earth water to the shaft of the gas storage well is separated; the well cementation quality of the gas storage well, the fixing strength of surface soil to the gas storage well and filling efficiency are effectively improved.
Description
Technical field
The invention belongs to high-pressure gas storage well cementing method and device thereof, particularly utilizing cement paste that high pressure underground gas well is carried out the cementing operation later stage, to gas storage well bore top pressurize supplementary irrigation, impel the more infiltration soil layers of cement paste and avoid occurring in the process of setting of cement paste between top layer conduit and gas storage well bore body shrinkage porosite, cavity and mix slurry, to improve the method and the supplementary irrigation device of cementing quality.
Background technology
At present, in CNG gas station and hot gas peak regulation station, cities and towns, gas holder station, extensively adopt high pressure underground gas well.This type of well for storage mainly adopts cementing methods such as direct circulation or seat well when cementing the well, the cement sheath of gas storage well 0～30m degree of depth under the face of land solidifies the back and waits defectives such as being prone to cavity, mixed slurry because of shrinking.Cement paste when perfusion under the prerequisite of not carrying out supplementary irrigation overflows the face of land to solidifying, and the cement anchor ring around the gas storage well generally will be contracted to about the following 5m in the face of land, and it is low to occur a large amount of cavity, ring body density in the cement sheath of top; At this type of disadvantage, after well cementation was finished, traditional method was to adopt manually under normal pressure supplementary irrigation or intubate supplementary irrigation to give to remedy.Because cement paste is the non newtonian body, carries out supplementary irrigation, too poor because of its flowability under normal pressure, still be difficult to overcome defectives such as the cavity that in cement sheath, occurs, mixed slurry, infiltration; Adopt above-mentioned conventional method supplementary irrigation, not only the qualification rate of the low but also pit shaft body top of the efficient of supplementary irrigation well cementation only about 20%.Thereby to high-pressure gas storage well well cementation adopts above-mentioned conventional supplementary irrigation method to exist the efficient of supplementary irrigation poor in the later stage, after the supplementary irrigation density of cement sheath and low with the bond strength of pit shaft body, cementing quality is poor, easily cause the pit shaft corrosion in the use because of infiltration, the pit shaft of gas storage well also can be because of frequent displacement produces fretting wear, corrodes the influence of pit shaft in addition and then causes gas storage well bore because of wall thickness attenuation fracture disadvantages such as security incident to take place.
Summary of the invention
The objective of the invention is at the existing defective of background technology, a kind of well for storage well cementation later stage of research and design is to the method and the device thereof of upper wellbore pressurization supplementary irrigation.The well for storage well cementation later stage to the upper wellbore supplementary irrigation of pressurizeing, shrink when solidifying and loss and the cavity occurs, mix defectives such as slurry to remedy cement paste; Reach refinforced cement slurry and solidify the compactness of back itself and the bond strength of cement paste and pit shaft body, the obstruct surface water is to the corrosion of gas storage well bore, effectively improves the cementing quality of gas storage well and the ground surface soil purposes such as constant intensity to gas storage well.
Solution of the present invention is at first to offer a flange hole that is used for the enhancing perfusion cement paste on the conduit of the top layer on gas storage well top, and be connected with the supplementary irrigation device that pressurizes by the flange on it, finish in the conventional cementing construction, promptly after the cementing slurry that pours into rises to the face of land, to initial set, promptly open (cement paste) compression pump, with deployed cement paste once or repeatedly pressurization irritate (notes) and go in the annular chamber between top layer conduit and the gas storage well bore body, solidify back, the dismounting supplementary irrigation device that pressurizes to priming charge mud.Therefore, the present invention's supplementary irrigation method of pressurizeing comprises: at first offer a flanged (FLGD) fill orifice that is used for the cement paste enhancing perfusion on the top layer conduit on conventional gas storage well top, treat that well for storage conventional cementing construction to the cementing slurry that pours into rises to behind (overflowing) face of land or to the cementing slurry initial set that pours into, the flange head that pours into pipe end by flange and cement paste in the cement paste pressurization supplementary irrigation device is connected; Open (cement paste) compression pump in the pressurization supplementary irrigation device then, under the pressure of 0.5-2.0MPa, the deployed cement paste of proportioning is routinely irritated (notes) goes in the annular chamber between top layer conduit and the gas storage well bore body, solidifies back, the dismounting supplementary irrigation device that pressurizes to priming charge mud.
Described with in the deployed annular chamber that grouts between top layer conduit and the gas storage well bore body, reperfusion mode adopts once or repeatedly pressurizes and pours into, after opening pressure pump pressurization supplementary irrigation to pressure reaches 0.5-2.0MPa when adopting repeatedly enhancing perfusion, after the conventional cementing construction rises to the face of land to the cementing slurry that pours into, valve-off and voltage stabilizing 15-120 minute, and then opening pressure pump and ball valve continue to pour into reach 0.5-2.0MPa to pressure after, voltage stabilizing 15-120 minute, the supplementary irrigation that so circulates is ended to reaching requirement.
Above-mentioned pressurization supplementary irrigation method equipment therefor comprises slurry commanding tank (pond), the cement paste filling mechanism, key is the cement paste filling mechanism for containing (water) mud pressure pump, and the cement paste intrusion pipe of voltage stabilizing valve, flanged head and cement paste inlet pipe are at interior cement paste enhancing perfusion device; The import and export of mud pressure pump is fastenedly connected with cement paste inlet pipe and cement paste intrusion pipe respectively, voltage stabilizing is serially connected with in the cement paste intrusion pipe between flange head and the mud pressure pump discharge with valve, uses when installing flange head and the supravasal flange hole of well body surface layer is fastenedly connected, the cement paste inlet pipe then inserts in the slurry commanding tank.
The present invention because finish in conventional cementing construction, promptly after the cementing slurry that pours into rises to the face of land, to initial set, be the opening pressure pump, deployed supplementary irrigation is irritated (notes) with cement paste through pressurization once or repeatedly goes in the annular chamber between top layer conduit and the gas storage well bore body, solidify to priming charge mud, adopt the inventive method and device the qualification rate of cementing quality can be brought up to more than 80%.Thereby have compactness and the bond strength of cement paste and pit shaft body and a qualification rate of well cementation that the slurry of refinforced cement significantly solidifies back itself, intercepted the corrosion of surface water, effectively improved the cementing quality of gas storage well and ground surface soil the constant intensity of gas storage well and the characteristics such as efficient of supplementary irrigation to gas storage well bore.
Description of drawings
Fig. 1 is the present invention pressurize supplementary irrigation apparatus structure and pressurization supplementary irrigation schematic diagram.
Among the figure: 1. flange head, 2. valve, 3. cement paste intrusion pipe; 4. (water) mud pressure pump, 5. cement paste inlet pipe, 6. slurry commanding tank (pond).
The specific embodiment
Present embodiment is being Φ 244.48mm (9 to mineshaft diameter
5/
8"), gas storage pressure are that the CNG gas station of 25MPa and city gas peak regulation station, gas holder station are example with the gas storage well well cementation later stage to upper wellbore pressurization supplementary irrigation:
At first offering a grout hole on the conduit of top layer is that 200 * 200mm, its upper flange plate are the flange hole that is used for the enhancing perfusion cement paste of 280 * 280mm; It is good simultaneously cement paste enhancing perfusion device to be pressed annexation connection shown in the accompanying drawing 1, and wherein: valve 2 adopts 2
1/
2" ball valve; cement paste inlet pipe 5 adopts conventional cement paste carrier pipes also to insert in the slurry commanding tank 6; main body of cement paste intrusion pipe 3 is pressed 8MPa, diameter 2 for bearing " high-pressure hose, adopt the steel pipe of Φ 76mm to connect between present embodiment flange head 1 and the ball valve 2, flange head 1 is in state to be connected with top layer conduit flange hole.When gas storage well conventional cementing operation is finished, is after cementing slurry overflows the face of land, in slurry commanding tank 6 in cement: the deployed supplementary irrigation cement paste of the ratio of carboxymethyl cellulose: gluconic acid sodium salt: cement expansive material: water=275kg: 1kg: 0.33kg: 25kg: 144kg; Simultaneously the flange on flange head on the cement paste intrusion pipe 31 and the top layer conduit flange hole is fastenedly connected.Start then mud pressure pump 4, to the annular housing between top layer conduit and the pit shaft carry out the enhancing perfusion cement paste when pump pressure is 1.5MPa, stop grouting and close ball valve 2 voltage stabilizings after 60 minutes, open ball valve 2 and start mud pressure pump 4, once more to the annular housing enhancing perfusion cement paste between top layer conduit and the pit shaft to pump pressure suspend during for 1.5MPa, voltage stabilizing is after 60 minutes, carry out for the third time enhancing perfusion cement paste to pump pressure and end during for 1.5MPa; Present embodiment is carried out the pressurization supplementary irrigation altogether three times.
Present embodiment cement paste solidify the back to surface layer below the supplementary irrigation section of 0～20m through sonar detection, its relative amplitude (the sound width of cloth) less than 20%; By SY/T6592 " primary cement evaluation method " and SY/T6641 " cementing concrete bond logging data handle and explain standard " standard, present embodiment supplementary irrigation section is high-quality well section.
Claims (3)
1. the well for storage well cementation later stage is to the method for upper wellbore pressurization supplementary irrigation, comprise: at first on the top layer conduit on conventional gas storage well top, offer a flanged (FLGD) fill orifice that is used for the cement paste enhancing perfusion, treat that well for storage conventional cementing construction to the cementing slurry that pours into rises to behind the face of land or to the cementing slurry initial set that pours into, the flange head that pours into pipe end by flange and cement paste in the cement paste pressurization supplementary irrigation device is connected; Open compression pump in the pressurization supplementary irrigation device then, under the pressure of 0.5-2.0MPa, with deployed the grouting in the annular chamber between top layer conduit and the gas storage well bore body, solidify the back, remove the supplementary irrigation device that pressurizes to priming charge mud of proportioning routinely.
2. by the method for described well for storage well cementation later stage of claim 1 to upper wellbore pressurization supplementary irrigation, it is characterized in that described reperfusion mode adopts once or repeatedly pressurization pour into, after opening pressure pump pressurization supplementary irrigation to pressure reaches 0.5-2.0MPa when adopting repeatedly enhancing perfusion, after the conventional cementing construction rises to the face of land to the cementing slurry that pours into, valve-off and voltage stabilizing 15-120 minute, and then opening pressure pump and ball valve continue to pour into reach 0.5-2.0MPa to pressure after, voltage stabilizing 15-120 minute, the supplementary irrigation that so circulates is ended to reaching requirement.
3. by the described pressurization supplementary irrigation of claim 1 method supplementary irrigation device, it is characterized in that the supplementary irrigation device comprises slurry commanding tank and contains (water) mud pressure pump, the cement paste intrusion pipe of voltage stabilizing valve, flanged head and cement paste inlet pipe are at interior cement paste enhancing perfusion device; The import and export of mud pressure pump is fastenedly connected with cement paste inlet pipe and cement paste intrusion pipe respectively, voltage stabilizing is serially connected with in the cement paste intrusion pipe between flange head and the mud pressure pump discharge with valve, and flange head and the supravasal flange hole of well body surface layer are fastenedly connected during use, the cement paste inlet pipe then inserts in the slurry commanding tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100714775A CN102168538A (en) | 2011-03-21 | 2011-03-21 | Method for pressurizing and filling upper part of shaft in well cementation later stage of underground gas storage well and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100714775A CN102168538A (en) | 2011-03-21 | 2011-03-21 | Method for pressurizing and filling upper part of shaft in well cementation later stage of underground gas storage well and device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114165190A (en) * | 2021-12-10 | 2022-03-11 | 四川川油天然气科技股份有限公司 | Method for ensuring smooth entry of hydrogen storage well casing and continuous and stable operation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3500926A (en) * | 1967-12-22 | 1970-03-17 | Shell Oil Co | Electroless metal bonding of unconsolidated formations into consolidated formations |
| US20060102350A1 (en) * | 2004-11-16 | 2006-05-18 | Halliburton Energy Services Group | Cementing methods using compressible cement compositions |
| CN101555779A (en) * | 2009-05-20 | 2009-10-14 | 胜利油田利丰稠油技术开发有限公司 | Interlayer channeling-preventing and well-completing process for inner-tube-free grout filling |
-
2011
- 2011-03-21 CN CN2011100714775A patent/CN102168538A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3500926A (en) * | 1967-12-22 | 1970-03-17 | Shell Oil Co | Electroless metal bonding of unconsolidated formations into consolidated formations |
| US20060102350A1 (en) * | 2004-11-16 | 2006-05-18 | Halliburton Energy Services Group | Cementing methods using compressible cement compositions |
| CN101555779A (en) * | 2009-05-20 | 2009-10-14 | 胜利油田利丰稠油技术开发有限公司 | Interlayer channeling-preventing and well-completing process for inner-tube-free grout filling |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114165190A (en) * | 2021-12-10 | 2022-03-11 | 四川川油天然气科技股份有限公司 | Method for ensuring smooth entry of hydrogen storage well casing and continuous and stable operation |
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