CN103924944B - 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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- CN103924944B CN103924944B CN201310408912.8A CN201310408912A CN103924944B CN 103924944 B CN103924944 B CN 103924944B CN 201310408912 A CN201310408912 A CN 201310408912A CN 103924944 B CN103924944 B CN 103924944B
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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 props up the horizontal well abandoned well operational method in roof mud stone or base plate mud stone, belong to coal
Layer gas exploitation field.
Background technology
Coal-bed gas exploitation is the first step of coal resources comprehensive mining, for ensureing making full use of of coal resources, needs over the ground
Environment caused by the extraction of face, security risk carry out maximum elimination.Coal bed gas multi-branch horizontal is exploitation coal bed gas resource
Main well type.For the main horizontal well in stable roof mud stone or base plate mud stone, when coal-bed gas exploitation terminate or because
When accident needs discarded, there is presently no a kind of abandoned well method for this well type, to guarantee roof and base plate mud stone
Integrality, thus prevent the potential safety hazard in later stage colliery scale recovery process.
Content of the invention
It is an object of the invention to provide a kind of coal bed gas horizontal well abandoned well operational method is it is adaptable to main in roof mud
Rock or the horizontal well of base plate mud stone, to guarantee the integrality of roof and base plate mud stone.
The purpose of the present invention is realized by following proposal: a kind of coal bed gas horizontal well abandoned well operational method, its feature
It is, when 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 a main horizontal hole end from horizontal well, is fully circulated with drilling fluid, and by the survey in drilling tool
Measuring appratus are pulled out, and drilling fluid continues cycling through, and observe metering and import and export discharge capacity and fluidity；
(2) according to institute's sealing well section borehole size, cement slurry volume needed for length computation, excellent according to the presetting period of cement mortar
Change construction, ground prepares 1.80≤ρ≤2.0g/cm3The cement mortar of conventional density, cement mortar is pressed into well from drilling tool water hole
Interior, master is propped up with well section before well end and nearest branch's side tracking point, branches end to next side tracking point well section,
Remote branch side tracking point well section in sleeve pipe carries out sealing successively；
(3) every certain well section of sealing, acts drilling tool closing well in well and waits solidifying 48-72 hour, so that cement mortar in well is fully solidified
Cementing；
(4) enter under drilling tool pressurization 30kn visit plug face, qualified after, repeat the above steps until by full well mud stone section sealing to cover
Manage interior 30 meters to complete, close testing pressure of well head 10mpa, qualified rear goes out drilling tool, completes abandoned well sealing operation.
A kind of coal bed gas horizontal well abandoned well operational method is it is characterised in that when coal bed gas horizontal well group has a bite multiple-limb
When 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, in horizontal well well head with adding the brill of tracer and sealing agent
Circulation is set up between well liquid and far-end cave well well head；
(2) ground metering imports and exports discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground prepare ρ≤
1.45g/cm3Low-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 to sleeve pipe, stops operation, and closes horizontal well and far-end cave well well head is waited and coagulated；
(3) treat that in well, cement mortar fully solidifies cementing, the solidifying 48-72 hour of time, horizontal well and far-end cave well well head are respectively
Pressure testing 20mpa, qualified after complete abandoned well sealing operation.
A kind of coal bed gas horizontal well abandoned well operational method is it is characterised in that when coal bed gas horizontal well group has a bite multiple-limb
When 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) followed with adding the clear water of tracer and sealing agent to set up between far-end cave well well head and horizontal well well head
Ring；
(2) ground metering imports and exports discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground prepare ρ≤
1.45g/cm3Low-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 mortar is filled to sleeve pipe, stop operation, close far-end cave well and horizontal well well head is waited and coagulated；
(3) treat that in well, cement mortar fully solidifies cementing, the solidifying 48-72 hour of time, horizontal well and far-end cave well well head are respectively
Pressure testing 10mpa, qualified after complete abandoned well sealing operation.
The invention has the beneficial effects as follows: master, branch's mud stone section cement are carried out sealing by the present invention, recover coal seam top
Plate, the integrality of base plate, do not affect gas production and terminate the scale exploitation of rear colliery.
Brief description
Fig. 1 is the coal bed gas horizontal well group structural representation having a bite multi-branched horizontal well and a bite cave well；
Fig. 2 is the coal bed gas horizontal well having a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well
Group structural representation；
Fig. 3 is after the coal bed gas horizontal well group having a bite multi-branched horizontal well and a bite cave well implements abandoned well sealing operation
Schematic diagram；
Fig. 4 is the coal bed gas horizontal well having a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well
Group implements 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.
Main mud stone section.
Specific embodiment
With reference to specific embodiment, the present invention is described further.Fig. 1 can have a bite multiple-limb as the present embodiment
The coal bed gas horizontal well group structural representation of horizontal well and a bite cave well, Fig. 2 can have a bite multiple-limb water as the present embodiment
Horizontal well and the coal bed gas horizontal well group structural representation of a bite near-end cave well, a bite far-end cave well, Fig. 3 can be used as this enforcement
Example has a bite multi-branched horizontal well and the coal bed gas horizontal well group of a bite cave well to implement the post-job schematic diagram of abandoned well sealing, figure
4 can have a bite multi-branched horizontal well and the coal bed gas level of a bite near-end cave well, a bite far-end cave well as the present embodiment
Well group implements the post-job schematic diagram of abandoned well sealing.
As shown in figure 1, in the horizontal well group that a bite multi-branched horizontal well (1) and a bite cave well (2) combine, horizontal well
Main is drilled with multiple horizontal branch, and horizontal segment is totally by branch's mud stone section (4), split seam section (5), main mud stone section (6) three
Individual part composition.
Drilling tool is reentried to main horizontal hole end from horizontal well (1), is fully circulated normally with clear water, and by drilling tool
Measuring instrument is pulled out, and clear water continues cycling through, and observes metering and imports and exports discharge capacity and fluidity, after normal, according to institute's sealing well section well
Eye size, cement slurry volume needed for length computation, according to the presetting period Optimizing construction of cement mortar, ready uncovered stand is used on ground
Cube slack tank prepares required conventional density (1.80≤ρ≤2.0g/cm3) cement mortar, by under become owner of the drilling tool of end
, to well to well section before main well end and nearest branch's side tracking point, branches end is to next sidetracking for infusion
Point well section, farthest branch side tracking point well section in sleeve pipe carries out sealing successively, the complete certain well section of every sealing, above carries drilling tool to sealing
Well section above 1-3 rice reacting cycle well-flushing, cement mortar unnecessary in drilling tool is washed out, and acts drilling tool closing well in well and waits solidifying 72 hours.
Under enter drilling tool pressurization 30kn visit plug face, qualified after, repeat the above steps until by full well mud stone section sealing to sleeve pipe
Interior 30 meters complete, and again enter down drilling tool and visit after cement plug face reaches requirement, close horizontal well (1), proximal-distal well (2) well head divides
Other pressure testing 10mpa, qualified rear goes out drilling tool, completes abandoned well sealing operation, sees Fig. 3.
Meanwhile, present invention also offers another kind of abandoned well construction method, as shown in Fig. 2 in a bite multi-branched horizontal well (1)
In the horizontal well group combining with a bite near-end cave well (2), a bite far-end cave well (3), horizontal well master props up and is drilled with multiple levels
Branch, horizontal segment is totally made up of branch's mud stone section (4), split seam section (5), (6) three parts of main mud stone section.
When needing abandoned well, the hole capacity of calculated level well mud stone section, in horizontal well (1) well head with adding a certain amount of energy
With the naked eye identification, color more obvious tracer and a certain amount of there is closure coal seam effect sealing agent clear water and far-end cave well
(3) set up circulation between well head.
Situations such as ground metering imports and exports discharge capacity with returning outlet fluidity, according to the use of institute's sealing well section volume and circulation well cleanup
Amount, prepares a certain amount of low-density (ρ≤1.45g/cm from ground with ready uncovered cube slack tank3) cement mortar, close
Near-end cave well (2) well head, pumps into low-density cement mortar from horizontal well (1) well head, until pump into the water in well from ground metering
Mud amount is filled to sleeve pipe, stops operation, and closes horizontal well (1) and far-end cave well (3) well head is waited and coagulated.
Treat that in well, cement mortar fully solidifies cementing, solidifying 72 hours of time, horizontal well (1) and far-end cave well (3) well head are respectively
Pressure testing 10mpa, qualified after complete abandoned well sealing operation, see Fig. 4.
Also can with the naked eye can be known with a certain amount of with addition between far-end cave well (3) well head and horizontal well (1) well head
Not, color more obvious tracer and a certain amount of there is closure coal seam effect sealing agent clear water set up circulation.
Situations such as ground metering imports and exports discharge capacity with returning outlet fluidity, according to the use of institute's sealing well section volume and circulation well cleanup
Amount, prepares a certain amount of low-density (ρ≤1.45g/cm from ground with ready uncovered cube slack tank3) cement mortar, close
Cave well well head 2, pumps into low-density cement mortar from cave well 3 well head, until from ground metering pump into cement slurry volume in well to
In sleeve pipe, stop operation, close horizontal well (1) and far-end cave well (3) well head is waited and coagulated.
Treat that in well, cement mortar fully solidifies cementing, solidifying 72 hours of time, horizontal well (1) and far-end cave well (3) well head are respectively
Pressure testing 20mpa, qualified after complete abandoned well sealing operation, see Fig. 4.
Claims (3)
1. a kind of coal bed gas horizontal well abandoned well operational method is it is characterised in that when coal bed gas horizontal well group has a bite multiple-limb water
When horizontal well and a bite cave well, abandoned well operation comprises the following steps:
(1) drilling tool is reentried to a main horizontal hole end from horizontal well, is fully circulated with drilling fluid, and by the measuring instrument in drilling tool
Device is pulled out, and drilling fluid continues cycling through, and observes metering and imports and exports discharge capacity and fluidity；
(2) according to institute's sealing well section borehole size, cement slurry volume needed for length computation, the presetting period according to cement mortar optimizes applies
Work, ground prepares 1.80≤ρ≤2.0g/cm3The cement mortar of conventional density, by cement mortar in drilling tool water hole press-in well, right
Well section before main well end and nearest branch's side tracking point, branches end to next side tracking point well section, farthest point
Prop up side tracking point well section in sleeve pipe and carry out sealing successively；
(3) every certain well section of sealing, acts drilling tool closing well in well and waits solidifying 48-72 hour, so that cement mortar in well is fully solidified cementing；
(4) enter under drilling tool pressurization 30kn visit plug face, qualified after, repeat the above steps until by full well mud stone section sealing to sleeve pipe
30 meters complete, and close testing pressure of well head 10mpa, and qualified rear goes out drilling tool, completes abandoned well sealing operation.
2. a kind of coal bed gas horizontal well abandoned well operational method according to claim 1 is it is characterised in that work as coal bed gas level
When 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 has two kinds of construction parties
Method, the construction method of the first abandoned well operation comprises the following steps:
(1) hole capacity of calculated level well mud stone section, in horizontal well well head with adding the drilling fluid of tracer and sealing agent
Circulation is set up and the well well head of far-end cave between；
(2) ground metering imports and exports discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground prepare ρ≤
1.45g/cm3Low-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 to sleeve pipe, stops operation, and closes horizontal well and far-end cave well well head is waited and coagulated；
(3) treat that in well, cement mortar fully solidifies cementing, the solidifying 48-72 hour of time, horizontal well and the pressure testing respectively of far-end cave well well head
20mpa, qualified after complete abandoned well sealing operation.
3. a kind of coal bed gas horizontal well abandoned well operational method according to claim 1 is it is characterised in that work as coal bed gas level
When well group has a bite multi-branched horizontal well and a bite near-end cave well, a bite far-end cave well, second abandoned well job execution side
Method completes according to the following steps:
(1) with adding the clear water of tracer and sealing agent to set up circulation between far-end cave well well head and horizontal well well head；
(2) ground metering imports and exports discharge capacity, according to the consumption of sealing well section volume and circulation well cleanup, from ground prepare ρ≤
1.45g/cm3Low-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 mortar is filled to sleeve pipe, stop operation, close far-end cave well and horizontal well well head is waited and coagulated；
(3) treat that in well, cement mortar fully solidifies cementing, the solidifying 48-72 hour of time, horizontal well and the pressure testing respectively of far-end cave well well head
10mpa, qualified after complete abandoned well sealing operation.
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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| 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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| Publication Number | Publication Date |
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| CN103924944A CN103924944A (en) | 2014-07-16 |
| CN103924944B true CN103924944B (en) | 2017-01-18 |
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| CN201310408912.8A Expired - Fee Related CN103924944B (en) | 2013-09-11 | 2013-09-11 | Well abandoning operation method for coal-bed gas horizontal wells |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912480B (en) * | 2015-04-30 | 2018-02-09 | 中煤科工集团西安研究院有限公司 | Coal bed gas near-end docks the brill completion method of horizontal well |
| CN105089529B (en) * | 2015-07-28 | 2017-10-27 | 西南石油大学 | A kind of safe circulating valve coordinates the method for former well formation testing tubing string cementing plug abandoned well |
| 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 |
| CN111058794B (en) * | 2019-11-26 | 2021-09-28 | 中国石油天然气股份有限公司 | Control method and device for applying back pressure to annulus |
Citations (5)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7104320B2 (en) * | 2003-12-04 | 2006-09-12 | Halliburton Energy Services, Inc. | Method of optimizing production of gas from subterranean formations |
-
2013
- 2013-09-11 CN CN201310408912.8A patent/CN103924944B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
| 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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Granted publication date: 20170118 Termination date: 20170911 |