CN105064951A - Well cementation method and well cementation device - Google Patents
Well cementation method and well cementation device Download PDFInfo
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- CN105064951A CN105064951A CN201510546533.4A CN201510546533A CN105064951A CN 105064951 A CN105064951 A CN 105064951A CN 201510546533 A CN201510546533 A CN 201510546533A CN 105064951 A CN105064951 A CN 105064951A
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Abstract
The invention provides a well cementation method and a well cementation device. The device comprises a drill pipe, an inserting head, an inserting type float collar and a casing pipe; one end of the drill pipe is connected with the inserting head, the other end of the drill pipe is used for injecting cement paste, the inserting head is inserted into the inserting type float collar, and a back pressure valve device is arranged in the inserting type float collar; the drill pipe is arranged in the casing pipe in a sleeved mode, a first annular space is formed between the outer wall of the casing pipe and the well wall; the back pressure valve device of the inserting type float collar is used for preventing the cement paste from flowing back to the casing pipe after the drill pipe is pulled out from the casing pipe. In the well cementation process, the cement paste injected from the drill pipe is pressed into the first annular space formed by the well wall and the casing pipe to enable drilling mud in the first annular space to flow over, so that only the cement paste in the space, formed in the pipe, of the drill pipe is needed to be replaced when follow-up mud replacement is performed, therefore, the mud replacement amount is small, and the continuity of well cementation is guaranteed. Meanwhile, the mud replacement amount is small, therefore, the clear water using amount is small, the replaced waste mud amount is small, water resources are saved, and pollution to the environment is little. In addition, the mud replacement time is shortened, the oil consumption is reduced, and manpower is saved.
Description
Technical field
The present invention relates to drilling technique, particularly relate to a kind of cementing method and cementing unit.
Background technology
In field, colliery, by pressure relief gas pumping mining well, extraction is carried out to gas.In the forming process of pressure relief gas pumping mining well, after spudding in, all need well cementation at every turn.Well cementation is and utilizes cement paste etc. the annular space between the borehole wall and sleeve pipe to be carried out the process of closing and solidifying, and the one-tenth well quality of cementing the well for pressure relief gas pumping mining well plays an important role, and directly affects the effect of mash gas extraction.
In general, in the forming process of IV type pressure relief gas pumping mining well, after first time spuds in, the aperture of well is 445mm, under enter that external diameter is 339.7mm, wall thickness is the sleeve pipe of 10.92mm.During well cementation, first inject drilling fluid to get rid of the air of sleeve pipe 11 and annular space 13, then cement paste is injected in sleeve pipe 11, make cement paste under the effect of the back pressure valve device of gravity, float collar 12 etc., be injected into the annular space 13 of the borehole wall 14 and sleeve pipe 11 formation, meanwhile, the drilling mud in annular space 13 overflows.After annular space 13 fills cement paste, carry out for slurry, namely with replacing out cement paste in sleeve pipe 11 for slurries to avoid cement slurry sets in sleeve pipe 11 and shutoff sleeve pipe, wherein, can water etc. for slurries.Can be specifically well cementation schematic diagram of the prior art see Fig. 1, Fig. 1.
In above-mentioned well cementing process, need in sleeve pipe, constantly to inject cement paste until annular space is full of cement paste, cement paste consumption is huge, only under cement paste continuous seepage and the timely prerequisite of clearing up of useless slurry, just can guarantee the continuity of anchorage, continuity cementing conditions is high, is difficult to realize.
Summary of the invention
The invention provides a kind of cementing method and cementing unit, by reduce in well cementing process for slurry amount, realize the object reducing cementing conditions.
First aspect, the embodiment of the present invention provides a kind of cementing unit, comprising: drilling rod (1), plug (2), plug-in type float collar (3), sleeve pipe (4); Wherein
One end of described drilling rod (1) is connected with described plug (2), and the other end is for injecting cement paste;
Described plug (2) is inserted into described plug-in type float collar (3), is provided with back pressure valve device in described plug-in type float collar (3);
Described drilling rod (1) is set in described sleeve pipe (4), the first annular space is formed between the outer wall of described sleeve pipe (4) and the borehole wall, the back pressure valve device of described plug-in type float collar (3) prevents described cement paste to be back to described sleeve pipe (4) after being used for preventing described drilling rod (1) from extracting from described sleeve pipe (4).
In the first possible implementation in first, described plug-in type float collar (3) seals with the contact position of described sleeve pipe (4), injects to avoid cement paste the second annular space formed between the outer wall of described drilling rod (1) and the inwall of described sleeve pipe (4).
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second in first is possible, this device also comprises: centralizer (5), described plug (2) is set in described centralizer (5), and described centralizer (5) makes described plug (2) be inserted into the center of described plug-in type float collar (3).
In conjunction with the implementation that the second of first aspect is possible, in the third the possible implementation in first, described centralizer (5) is circular, and seals with the contact position of described sleeve pipe (4).
In conjunction with the implementation that the second of first aspect is possible, in the 4th kind of possible implementation in first, described centralizer (5) is rigid centralizer.
Second aspect, the invention provides a kind of cementing method, and be applicable to the first cementing unit realized to any one mode in the 4th kind of as above first aspect, first aspect, the method comprises:
Cement paste in described drilling rod is pressed into described first annular space, overflows to make the drilling mud in described first annular space;
After described first annular space fills cement paste, replace out the cement paste in described drilling rod.
In the first possible implementation in second, the method also comprises: if cement paste injects described second annular space, then increase the pressure between described plug and described plug-in type float collar.
In the implementation that the second in second is possible, the method also comprises: if plug-in type float collar described in described plug misalignment, then rotate described drilling rod, with the center making the described plug be connected on described drilling rod be inserted into described plug-in type float collar 3.
The cementing method that the embodiment of the present invention provides and cementing unit, by drilling rod, sleeve pipe is divided into two spaces, during well cementation, the first annular space of the borehole wall and sleeve pipe formation is pressed into from the cement paste of drilling rod injection, drilling mud in first annular space is overflowed, make follow-up for slurry time, the cement paste in the bar only needing to replace out drilling rod in space, little for slurry amount, ensure that the continuity of well cementation.Meanwhile, little for slurry amount, make rinse dosage useless slurry amount that is little, that replace out little, saving water resource, little to the pollution of environment.And, shorten for the slurry time, save oil consumption and manpower.
Accompanying drawing explanation
Fig. 1 is well cementation schematic diagram of the prior art;
The structural representation of the cementing unit that Fig. 2 provides for one embodiment of the invention;
The cemented process schematic of cementing unit that Fig. 3 provides for one embodiment of the invention;
The cementing unit that Fig. 4 provides for one embodiment of the invention replaces the process schematic starched;
The structural representation of the cementing unit that Fig. 5 provides for another embodiment of the present invention;
The flow chart of the cementing method that Fig. 6 provides for one embodiment of the invention.
Detailed description of the invention
The structural representation of the cementing unit that Fig. 2 provides for one embodiment of the invention.Please refer to Fig. 2, cementing unit provided by the invention comprises: drilling rod 1, plug 2, plug-in type float collar 3, sleeve pipe 4, wherein, one end of drilling rod 1 is connected with plug 2, and the other end is for injecting cement paste, plug 2 is inserted into plug-in type float collar 3, is provided with back pressure valve device in plug-in type float collar 3; Drilling rod 1 is set in sleeve pipe 4, forms the first annular space 6 between the outer wall of sleeve pipe 4 and the borehole wall 8; The back pressure valve device of plug-in type float collar 3 prevents cement paste to be back to sleeve pipe 4 after being used for preventing drilling rod 1 from extracting from sleeve pipe 4.
Below, the operating principle of the cementing unit that the embodiment of the present invention provides is elaborated, specifically can see Fig. 3 and Fig. 4, the cemented process schematic of cementing unit that Fig. 3 provides for one embodiment of the invention, the cementing unit that Fig. 4 provides for one embodiment of the invention replaces the process schematic starched, wherein, and ellipse representation cement paste, rhombus represents drilling mud, and triangle represents for slurries.
During well cementation, one end of drilling rod 1 is connected with plug 2, then the patchhole of plug-in type float collar 3 is inserted into, thus the space in sleeve pipe 4 is divided into two parts: space in the bar of drilling rod 1, and the annular space between the outer wall of drilling rod 1 and sleeve pipe 4 inwall, i.e. the second annular space 7, wherein, in the bar of drilling rod 1, space is also referred to as space in drilling tool water hole.During well cementation, need equally first to inject drilling fluid to get rid of the air of sleeve pipe and annular space, then, the plug 2 be connected is inserted into the patchhole of plug-in type float collar 3 with drilling rod 1.Then, cement paste is injected from one end away from plug 2 of drilling rod 1, as shown in Figure 3, the cement paste injecting drilling rod 1 is pressed into the first annular space 6, and the drilling mud in the first annular space 6 is overflowed, after the first annular space 6 fills cement paste, namely, after returning out cement paste from the first annular space 6, with the cement paste replaced out for slurries in drilling rod 1, then from sleeve pipe 4, drilling rod 1 is extracted, thus complete anchorage, as shown in Figure 4.Wherein, can be water etc. for slurries.Extract drilling rod 1 from sleeve pipe 4 after, the back pressure valve device of plug-in type float collar 3 can prevent cement paste to be back in sleeve pipe 4.
In above-mentioned well cementing process, only need the cement paste in drilling rod 1 to replace.After spudding in for first time, well depth is 800 meters, and empirical tests, is about 2.7m for slurry amount
3, be inject cement slurry cementing method for 4.22% of slurry amount from sleeve pipe in prior art.
In above-mentioned well cementing process, plug-in type float collar 3 seals with the contact position of sleeve pipe 4, injects described second annular space 7 to avoid cement paste.
In above-mentioned well cementing process, during lower brill, when the plug 2 by jointed rod 1 inserts plug-in type float collar 3, must put the oil in the joint of drilling rod 1, above link closely, with mortar leakage prevention.When plug 2 is apart from plug-in type float collar 3 about 20 meters ~ 30 meters, needs the lowering velocity controlling drilling rod 1, check in time when being hampered.In the insertion process of plug 2, if the patchhole of misalignment plug-in type float collar 3, need rotary drill rod, with the center making plug 2 be inserted into plug-in type float collar 3.After plug 2 inserts, Stress control is carried out to drilling rod 1, such as, by Stress control at 20,000 Ns, with the back pressure valve device avoiding the deadweight of drilling rod 1 to damage plug-in type float collar 3 by pressure.
In above-mentioned well cementing process, the process of cement paste is injected to drilling rod 1, need conscientiously to observe and form the second annular space 7 between the outer wall of drilling rod 1 and the inwall of sleeve pipe 4 and whether return out cement paste, if have, then increase the pressure of drilling rod 1 to guarantee that plug 2 is inserted into the patchhole of plug-in type float collar 3, plug-in type float collar 3 is sealed with the contact position of sleeve pipe 4, returns out from the second annular space 7 to avoid cement paste.
In above-mentioned well cementing process, for spatial volume in the bar needing conscientiously to determine drilling rod during slurry, and strictly check for slurry amount, will reduce to minimum for the error of slurry amount, block drilling rod to prevent water mud or for empty phenomenon.When anchorage completes, pull out of hole immediately, surprisingly cause underground drilling accident to prevent.
The cementing unit that the embodiment of the present invention provides, by drilling rod, sleeve pipe is divided into two spaces, during well cementation, the first annular space of the borehole wall and sleeve pipe formation is pressed into from the cement paste of drilling rod injection, drilling mud in first annular space is overflowed, make follow-up for slurry time, the cement paste in the bar only needing to replace out drilling rod in space, little for slurry amount, ensure that the continuity of well cementation.Meanwhile, little for slurry amount, make rinse dosage useless slurry amount that is little, that replace out little, saving water resource, little to the pollution of environment.And, shorten for the slurry time, save oil consumption and manpower.
The structural representation of the cementing unit that Fig. 5 provides for another embodiment of the present invention.Please refer to Fig. 5, the cementing unit that the present embodiment provides, on the basis of structure described in above-mentioned Fig. 2, also comprises: centralizer 5, described plug 2 is set in described centralizer 5, and described centralizer 5 makes described plug 2 be inserted into the center of described plug-in type float collar 3.Concrete, for making plug 2 be inserted in the patchhole of plug-in type float collar 3 smoothly, plug 2 connects centralizer 5, such as rigid centralizer, to guarantee that plug 2 is inserted into the center of plug-in type float collar 3.
Optionally, in above-described embodiment, centralizer 5 is such as circular, and seals with the contact position of sleeve pipe 4, and during to avoid cementing the well, cement paste injects between the outer wall of drilling rod 1 and the inwall of sleeve pipe 4 and forms the second annular space 7.
In addition, on the basis of above-mentioned cementing unit, the embodiment of the present invention also provides a kind of cementing method, and the flow chart of the cementing method that specifically can provide for one embodiment of the invention see Fig. 6, Fig. 6, it comprises the steps:
101, the cement paste in described drilling rod is pressed into described first annular space, overflows to make the drilling mud in described first annular space.
102, after described first annular space fills cement paste, the cement paste in described drilling rod is replaced out.
Optionally, this cementing method also comprises: if cement paste injects described second annular space, then increase the pressure between described plug and described plug-in type float collar.
Optionally, this cementing method also comprises: if plug-in type float collar described in described plug misalignment, then rotate described drilling rod, with the center making the described plug be connected on described drilling rod be inserted into described plug-in type float collar 3.
Cementing method provided by the present invention, be the method that above-mentioned cementing unit is corresponding, specific implementation refers to the various embodiments described above, repeats no more herein.
Cementing method provided by the invention, by drilling rod, sleeve pipe is divided into two spaces, during well cementation, the first annular space of the borehole wall and sleeve pipe formation is pressed into from the cement paste of drilling rod injection, drilling mud in first annular space is overflowed, make follow-up for slurry time, the cement paste in the bar only needing to replace out drilling rod in space, little for slurry amount, ensure that the continuity of well cementation.Meanwhile, little for slurry amount, make rinse dosage useless slurry amount that is little, that replace out little, saving water resource, little to the pollution of environment.And, shorten for the slurry time, save oil consumption and manpower.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (8)
1. a cementing unit, is characterized in that, comprising: drilling rod (1), plug (2), plug-in type float collar (3), sleeve pipe (4); Wherein
One end of described drilling rod (1) is connected with described plug (2), and the other end is for injecting cement paste;
Described plug (2) is inserted into described plug-in type float collar (3), is provided with back pressure valve device in described plug-in type float collar (3);
Described drilling rod (1) is set in described sleeve pipe (4), the first annular space is formed between the outer wall of described sleeve pipe (4) and the borehole wall, the back pressure valve device of described plug-in type float collar (3) prevents described cement paste to be back to described sleeve pipe (4) after being used for preventing described drilling rod (1) from extracting from described sleeve pipe (4).
2. device according to claim 1, it is characterized in that, described plug-in type float collar (3) seals with the contact position of described sleeve pipe (4), injects to avoid cement paste the second annular space formed between the outer wall of described drilling rod (1) and the inwall of described sleeve pipe (4).
3. device according to claim 1 and 2, it is characterized in that, also comprise: centralizer (5), described plug (2) is set in described centralizer (5), and described centralizer (5) makes described plug (2) be inserted into the center of described plug-in type float collar (3).
4. device according to claim 3, is characterized in that, described centralizer (5) is circular, and seals with the contact position of described sleeve pipe (4).
5. device according to claim 3, is characterized in that, described centralizer (5) is rigid centralizer.
6. a cementing method, is applicable to the cementing unit as described in any one of Claims 1 to 5, it is characterized in that, comprising:
Cement paste in described drilling rod is pressed into described first annular space, overflows to make the drilling mud in described first annular space;
After described first annular space fills cement paste, replace out the cement paste in described drilling rod.
7. method according to claim 6, is characterized in that, also comprises: if cement paste injects described second annular space, then increase the pressure between described plug and described plug-in type float collar.
8. method according to claim 6, is characterized in that, also comprises: if plug-in type float collar described in described plug misalignment, then rotate described drilling rod, with the center making the described plug be connected on described drilling rod be inserted into described plug-in type float collar 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510546533.4A CN105064951A (en) | 2015-08-31 | 2015-08-31 | Well cementation method and well cementation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510546533.4A CN105064951A (en) | 2015-08-31 | 2015-08-31 | Well cementation method and well cementation device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244342B1 (en) * | 1999-09-01 | 2001-06-12 | Halliburton Energy Services, Inc. | Reverse-cementing method and apparatus |
| CN103603628A (en) * | 2013-12-11 | 2014-02-26 | 中国石油集团川庆钻探工程有限公司 | Injecting-plugging method during under-well work |
| CN104329048A (en) * | 2014-09-15 | 2015-02-04 | 中国石油化工股份有限公司 | Inner pipe insertion type cementer |
| CN204492749U (en) * | 2015-03-26 | 2015-07-22 | 中国石油集团渤海钻探工程有限公司 | With the float collar of shut-in valve |
| CN205012964U (en) * | 2015-08-31 | 2016-02-03 | 淮南矿业(集团)有限责任公司 | Well cementation device |
-
2015
- 2015-08-31 CN CN201510546533.4A patent/CN105064951A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6244342B1 (en) * | 1999-09-01 | 2001-06-12 | Halliburton Energy Services, Inc. | Reverse-cementing method and apparatus |
| CN103603628A (en) * | 2013-12-11 | 2014-02-26 | 中国石油集团川庆钻探工程有限公司 | Injecting-plugging method during under-well work |
| CN104329048A (en) * | 2014-09-15 | 2015-02-04 | 中国石油化工股份有限公司 | Inner pipe insertion type cementer |
| CN204492749U (en) * | 2015-03-26 | 2015-07-22 | 中国石油集团渤海钻探工程有限公司 | With the float collar of shut-in valve |
| CN205012964U (en) * | 2015-08-31 | 2016-02-03 | 淮南矿业(集团)有限责任公司 | Well cementation device |
Non-Patent Citations (1)
| Title |
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| 何庆庞 主编: "《石油技工学校教材 钻井工程》", 31 July 1987, 石油工业出版社 * |
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Application publication date: 20151118 |