CN103924944A - Well abandoning operation method for coal-bed gas horizontal wells - Google Patents
Well abandoning operation method for coal-bed gas horizontal wells Download PDFInfo
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- CN103924944A CN103924944A CN201310408912.8A CN201310408912A CN103924944A CN 103924944 A CN103924944 A CN 103924944A CN 201310408912 A CN201310408912 A CN 201310408912A CN 103924944 A CN103924944 A CN 103924944A
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Abstract
The invention discloses a well abandoning operation method for coal-bed gas horizontal wells, and belongs to the field of coal-bed gas exploitation. The well abandoning operation method includes that a drilling tool reenters the tail end of a main horizontal hole from a horizontal well, and sufficient circulation is carried out by the aid of clear water; the required quantity of cement slurry is computed according to the size and the length of the hole of a sealed well section, construction is optimized by means of controlling the initial setting time of the cement slurry, the cement slurry with the conventional density rho which is higher than or equal to 1.80g/cm<3> and is lower than or equal to 2.0g/cm<3> is prepared on the ground and is compressed into the well from a water hole of the drilling tool, and the main hole is sealed in a sectioned manner; the drilling tool in the well is tripped out and the well is shut down and waits on cement setting for 48-72 hours whenever a well section is sealed, so that the cement slurry in the well can be sufficiently set and solidified; the drilling tool is tripped into the well to detect plug surfaces, the previous steps are repeatedly carried out after the plug surfaces are qualified until all mudstone sections, including mudstone sections in casings, of the well are completely sealed, a wellhead is shut down, whether the pressure of the well is 10MPa or not is tested, the drilling tool is tripped out of the well after the pressure of the well is qualified, and well abandoning sealing operation is completed. The well abandoning operation method has the advantages that the main and branch mudstone sections are sealed by the aid of cement, accordingly, the integrity of coal-bed top plates and bottom plates can be recovered, and large-scale coal mining is unaffected after gas exploitation is completed.
Description
Technical field
The present invention relates to a kind of master and prop up the horizontal well abandoned well operational method at roof mud stone or base plate mud stone, belong to coal-bed gas exploitation field.
Background technology
Coal-bed gas exploitation is the first step of coal resources comprehensive mining, and for ensureing making full use of of coal resources, environment, the security risk that need cause ground extraction carried out maximum and eliminated.Coal bed gas multi-branch horizontal is the main well type of exploitation coal bed gas resource.Prop up at stable roof mud stone or the horizontal well of base plate mud stone for main; in the time that coal-bed gas exploitation finishes or need to discard because of accident; also there is no at present a kind of abandoned well method for this well type; to guarantee the integrality of roof and base plate mud stone, thus the potential safety hazard in prevention later stage colliery scale recovery process.
Summary of the invention
The object of this invention is to provide a kind of coal bed gas horizontal well abandoned well operational method, be applicable to main the horizontal well at roof mud stone or base plate mud stone, to guarantee the integrality of roof and base plate mud stone.
The object of the invention is to realize by following proposal: a kind of coal bed gas horizontal well abandoned well operational method, it is characterized in that, in the time that coal bed gas horizontal well group has a bite multi-branched horizontal well and a bite cave well, abandoned well operation comprises the following steps:
(1) drilling tool is reentried to main horizontal hole end from horizontal well, fully circulates with drilling fluid, and the measuring apparatus in drilling tool is pulled out, and drilling fluid continues circulation, observes metering and imports and exports discharge capacity and fluidity;
(2) according to institute's sealing well section borehole size, the required cement slurry volume of length computation, according to the initial setting time Optimizing construction of cement paste, ground prepares 1.80≤ρ≤2.0g/cm
3the cement paste of conventional density, is pressed into cement paste in well from drilling tool water hole, and to well section before main well end and nearest branch's side tracking point, branches end is to next side tracking point well section, and branch's side tracking point carries out sealing successively to the interior well section of sleeve pipe farthest;
(3) the certain well section of every sealing, trips out drilling tool closing well in well and waits solidifying 48-72 hour, makes cement paste in well fully solidify cementing;
(4) be lowered to drilling tool pressurization 30kN and visit plug face, qualified after, repeat above-mentioned steps until by the sealing of full well mud stone section in sleeve pipe 30 meters complete, close testing pressure of well head 10Mpa, trip out drilling tool after qualified, complete abandoned well sealing operation.
A kind of coal bed gas horizontal well abandoned well operational method, is characterized in that, in the time that coal bed gas horizontal well group has a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well, abandoned well operation comprises the following steps:
(1) hole capacity of calculated level well mud stone section, circulates with setting up between the drilling fluid that adds tracer and sealing agent and far-end cave well well head at horizontal well well head;
(2) ground metering is imported and exported discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground preparation ρ≤1.45g/cm
3low-density cement mortar, close near-end cave well well head, be pressed into low-density cement mortar from horizontal well well head, until cement slurry volume is filled in sleeve pipe, stop operation, close horizontal well and far-end cave well well head and wait solidifying;
(3) treat in well that cement paste fully solidifies cementing, wait solidifying 48-72 hour, horizontal well and far-end cave well well head be pressure testing 20Mpa respectively, completes abandoned well sealing operation after qualified.
A kind of coal bed gas horizontal well abandoned well operational method, is characterized in that, in the time that coal bed gas horizontal well group has a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well, abandoned well operation can also complete according to the following steps:
(1) from setting up circulation with the clear water that adds tracer and sealing agent between far-end cave well well head and horizontal well well head;
(2) ground metering is imported and exported discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground preparation ρ≤1.45g/cm
3low-density cement mortar, close near-end cave well well head, be pressed into low-density cement mortar from far-end cave well well head, until cement paste is filled in sleeve pipe, stop operation, close far-end cave well and horizontal well well head and wait solidifying;
(3) treat in well that cement paste fully solidifies cementing, wait solidifying 48-72 hour, horizontal well and far-end cave well well head be pressure testing 10Mpa respectively, completes abandoned well sealing operation after qualified.
The invention has the beneficial effects as follows: master, branch's mud stone section cement are carried out sealing by the present invention, recover the integrality of roof, base plate, do not affect gas production and finish the scale exploitation of rear colliery.
Brief description of the drawings
Fig. 1 is the coal bed gas horizontal well group structural representation that has a bite multi-branched horizontal well and a bite cave well;
Fig. 2 is the coal bed gas horizontal well group structural representation that has a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well;
Fig. 3 has the coal bed gas horizontal well group of a bite multi-branched horizontal well and a bite cave well to implement the post-job schematic diagram of abandoned well sealing;
Fig. 4 has the coal bed gas horizontal well group of a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well to implement the post-job schematic diagram of abandoned well sealing.
In figure: 1. horizontal well; 2. near-end cave well; 3. far-end cave well; 4. branch's mud stone section; 5. split seam section; 6. a main mud stone section.
Detailed description of the invention
Below in conjunction with specific embodiment, just the present invention is described further.Fig. 1 can be used as the present embodiment the coal bed gas horizontal well group structural representation of a bite multi-branched horizontal well and a bite cave well, Fig. 2 can be used as the present embodiment a bite multi-branched horizontal well and a bite near-end cave well, the coal bed gas horizontal well group structural representation of a bite far-end cave well, Fig. 3 can be used as the present embodiment has the coal bed gas horizontal well group of a bite multi-branched horizontal well and a bite cave well to implement the post-job schematic diagram of abandoned well sealing, Fig. 4 can be used as the present embodiment a bite multi-branched horizontal well and a bite near-end cave well, the coal bed gas horizontal well group of a bite far-end cave well is implemented the post-job schematic diagram of abandoned well sealing.
As shown in Figure 1, in the horizontal well group of a bite multi-branched horizontal well (1) and a bite cave well (2) combination, horizontal well master props up and is drilled with multiple horizontal branch, and horizontal segment is totally made up of branch's mud stone section (4), split seam section (5), (6) three parts of a main mud stone section.
Drilling tool is reentried to a main horizontal hole end from horizontal well (1), fully circulate normally with clear water, and the measuring apparatus in drilling tool is pulled out, clear water continues circulation, observe metering and import and export discharge capacity and fluidity, after normal, according to institute's sealing well section borehole size, the required cement slurry volume of length computation, according to the initial setting time Optimizing construction of cement paste, ground prepares required conventional density (1.80≤ρ≤2.0g/cm with ready uncovered cube slack tank
3) cement paste, by under become owner of end drilling tool infusion in well to a main well end and nearest branch's side tracking point well section before, branches end is to next side tracking point well section, branch's side tracking point carries out sealing successively to the interior well section of sleeve pipe farthest, the complete certain well section of every sealing, on carry drilling tool to the anti-circulation well cleanup of the above 1-3 rice of sealing well section, superfluous water mud in drilling tool is washed out, trip out drilling tool closing well in well and wait solidifying 72 hours.
Be lowered to drilling tool pressurization 30kN and visit plug face, after qualified, repeat above-mentioned steps until by the sealing of full well mud stone section in sleeve pipe 30 meters complete, again being lowered to drilling tool spy cement plug face reaches after requirement, close horizontal well (1), proximal-distal well (2) well head pressure testing 10Mpa respectively, after qualified, trip out drilling tool, complete abandoned well sealing operation, see Fig. 3.
Simultaneously, the present invention also provides another kind of abandoned well construction method, as shown in Figure 2, in the horizontal well group of a bite multi-branched horizontal well (1) and a bite near-end cave well (2), a bite far-end cave well (3) combination, horizontal well master props up and is drilled with multiple horizontal branch, and horizontal segment is totally made up of branch's mud stone section (4), split seam section (5), (6) three parts of a main mud stone section.
While needing abandoned well, the hole capacity of calculated level well mud stone section, a certain amount ofly can with the naked eye identify with adding at horizontal well (1) well head, color comparatively significantly tracer and a certain amount of have between shutoff coal seam effect sealing agent clear water and far-end cave well (3) well head set up and circulate.
Ground metering is imported and exported discharge capacity and is returned the situations such as outlet fluidity, according to the consumption of institute's sealing well section volume and circulation well cleanup, prepares a certain amount of low-density (ρ≤1.45g/cm from ground with ready uncovered cube slack tank
3) cement paste, close near-end cave well (2) well head, pump into low-density cement mortar from horizontal well (1) well head, until the cement slurry volume pumping in well from ground metering is filled in sleeve pipe, stop operation, close horizontal well (1) and far-end cave well (3) well head and wait solidifying.
Treat in well that cement paste fully solidifies cementing, wait solidifying 72 hours, horizontal well (1) and far-end cave well (3) well head are distinguished pressure testing 10Mpa, complete abandoned well sealing operation after qualified, see Fig. 4.
Also can between far-end cave well (3) well head and horizontal well (1) well head with adding with a certain amount ofly with the naked eye identifying, comparatively significantly tracer and a certain amount ofly there is shutoff coal seam effect sealing agent clear water and set up circulation of color.
Ground metering is imported and exported discharge capacity and is returned the situations such as outlet fluidity, according to the consumption of institute's sealing well section volume and circulation well cleanup, prepares a certain amount of low-density (ρ≤1.45g/cm from ground with ready uncovered cube slack tank
3) cement paste, close cave well well head 2, pump into low-density cement mortar from cave well 3 well heads, until pump into cement slurry volume in well to sleeve pipe from ground metering, stop operation, close horizontal well (1) and far-end cave well (3) well head and wait solidifying.
Treat in well that cement paste fully solidifies cementing, wait solidifying 72 hours, horizontal well (1) and far-end cave well (3) well head are distinguished pressure testing 20Mpa, complete abandoned well sealing operation after qualified, see Fig. 4.
Claims (3)
1. a coal bed gas horizontal well abandoned well operational method, is characterized in that, in the time that coal bed gas horizontal well group has a bite multi-branched horizontal well and a bite cave well, abandoned well operation comprises the following steps:
(1) drilling tool is reentried to main horizontal hole end from horizontal well, fully circulates with drilling fluid, and the measuring apparatus in drilling tool is pulled out, and drilling fluid continues circulation, observes metering and imports and exports discharge capacity and fluidity;
(2) according to institute's sealing well section borehole size, the required cement slurry volume of length computation, according to the initial setting time Optimizing construction of cement paste, ground prepares 1.80≤ρ≤2.0g/cm
3the cement paste of conventional density, is pressed into cement paste in well from drilling tool water hole, and to well section before main well end and nearest branch's side tracking point, branches end is to next side tracking point well section, and branch's side tracking point carries out sealing successively to the interior well section of sleeve pipe farthest;
(3) the certain well section of every sealing, trips out drilling tool closing well in well and waits solidifying 48-72 hour, makes cement paste in well fully solidify cementing;
(4) be lowered to drilling tool pressurization 30kN and visit plug face, qualified after, repeat above-mentioned steps until by the sealing of full well mud stone section in sleeve pipe 30 meters complete, close testing pressure of well head 10Mpa, trip out drilling tool after qualified, complete abandoned well sealing operation.
2. a kind of coal bed gas horizontal well abandoned well operational method according to claim 1, is characterized in that, in the time that coal bed gas horizontal well group has a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well, abandoned well operation comprises the following steps:
(1) hole capacity of calculated level well mud stone section, circulates with setting up between the drilling fluid that adds tracer and sealing agent and far-end cave well well head at horizontal well well head;
(2) ground metering is imported and exported discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground preparation ρ≤1.45g/cm
3low-density cement mortar, close near-end cave well well head, be pressed into low-density cement mortar from horizontal well well head, until cement slurry volume is filled in sleeve pipe, stop operation, close horizontal well and far-end cave well well head and wait solidifying;
(3) treat in well that cement paste fully solidifies cementing, wait solidifying 48-72 hour, horizontal well and far-end cave well well head be pressure testing 20Mpa respectively, completes abandoned well sealing operation after qualified.
3. a kind of coal bed gas horizontal well abandoned well operational method according to claim 1, it is characterized in that, in the time that coal bed gas horizontal well group has a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well, abandoned well operation can also complete according to the following steps:
(1) from setting up circulation with the clear water that adds tracer and sealing agent between far-end cave well well head and horizontal well well head;
(2) ground metering is imported and exported discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground preparation ρ≤1.45g/cm
3low-density cement mortar, close near-end cave well well head, be pressed into low-density cement mortar from far-end cave well well head, until cement paste is filled in sleeve pipe, stop operation, close far-end cave well and horizontal well well head and wait solidifying;
(3) treat in well that cement paste fully solidifies cementing, wait solidifying 48-72 hour, horizontal well and far-end cave well well head be pressure testing 10Mpa respectively, completes abandoned well sealing operation after qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310408912.8A CN103924944B (en) | 2013-09-11 | 2013-09-11 | Well abandoning operation method for coal-bed gas horizontal wells |
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| CN201310408912.8A CN103924944B (en) | 2013-09-11 | 2013-09-11 | Well abandoning operation method for coal-bed gas horizontal wells |
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| CN103924944A true CN103924944A (en) | 2014-07-16 |
| CN103924944B CN103924944B (en) | 2017-01-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912480A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Drilling and completion method for coal bed gas near-end butt-joint horizontal well |
| CN105089529A (en) * | 2015-07-28 | 2015-11-25 | 西南石油大学 | Safe circulation valve and plug cementing well abandoning method of safe circulation valve through being matched with original well oil testing pipe column |
| CN109372465A (en) * | 2018-09-29 | 2019-02-22 | 中国石化江汉油田分公司江汉采油厂 | A kind of method for blocking for empty well cylinder abandoned well |
| CN111058794A (en) * | 2019-11-26 | 2020-04-24 | 中国石油天然气股份有限公司 | Control method and device for applying back pressure to annulus |
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| US3850249A (en) * | 1972-07-19 | 1974-11-26 | Chevron Res | Method for delaying the setting of an acid-settable liquid in a terrestrial zone |
| US4289354A (en) * | 1979-02-23 | 1981-09-15 | Edwin G. Higgins, Jr. | Borehole mining of solid mineral resources |
| US20050121193A1 (en) * | 2003-12-04 | 2005-06-09 | Buchanan Larry J. | Method of optimizing production of gas from subterranean formations |
| CN1924291A (en) * | 2006-07-27 | 2007-03-07 | 山东省煤田地质局第二勘探队 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
| CN101936142A (en) * | 2010-08-05 | 2011-01-05 | 北京奥瑞安能源技术开发有限公司 | Aerated underbalanced drilling method for coal-bed gas |
| CN102116140A (en) * | 2011-01-25 | 2011-07-06 | 煤炭科学研究总院西安研究院 | Construction method for enhancing extraction effect of ground coal bed gas |
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- 2013-09-11 CN CN201310408912.8A patent/CN103924944B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3850249A (en) * | 1972-07-19 | 1974-11-26 | Chevron Res | Method for delaying the setting of an acid-settable liquid in a terrestrial zone |
| US4289354A (en) * | 1979-02-23 | 1981-09-15 | Edwin G. Higgins, Jr. | Borehole mining of solid mineral resources |
| US20050121193A1 (en) * | 2003-12-04 | 2005-06-09 | Buchanan Larry J. | Method of optimizing production of gas from subterranean formations |
| CN1924291A (en) * | 2006-07-27 | 2007-03-07 | 山东省煤田地质局第二勘探队 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
| CN101936142A (en) * | 2010-08-05 | 2011-01-05 | 北京奥瑞安能源技术开发有限公司 | Aerated underbalanced drilling method for coal-bed gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912480A (en) * | 2015-04-30 | 2015-09-16 | 中煤科工集团西安研究院有限公司 | Drilling and completion method for coal bed gas near-end butt-joint horizontal well |
| CN105089529A (en) * | 2015-07-28 | 2015-11-25 | 西南石油大学 | Safe circulation valve and plug cementing well abandoning method of safe circulation valve through being matched with original well oil testing pipe column |
| CN109372465A (en) * | 2018-09-29 | 2019-02-22 | 中国石化江汉油田分公司江汉采油厂 | A kind of method for blocking for empty well cylinder abandoned well |
| CN111058794A (en) * | 2019-11-26 | 2020-04-24 | 中国石油天然气股份有限公司 | Control method and device for applying back pressure to annulus |
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| CN103924944B (en) | 2017-01-18 |
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