CN102505944A - Water sealing method for replacing mud in freezing holes with slow setting cement grout - Google Patents
Water sealing method for replacing mud in freezing holes with slow setting cement grout Download PDFInfo
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- CN102505944A CN102505944A CN2011103388710A CN201110338871A CN102505944A CN 102505944 A CN102505944 A CN 102505944A CN 2011103388710 A CN2011103388710 A CN 2011103388710A CN 201110338871 A CN201110338871 A CN 201110338871A CN 102505944 A CN102505944 A CN 102505944A
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Abstract
The invention provides a water sealing method for replacing mud in freezing holes with slow setting cement grout. Before the cement grout is stirred, the freezing holes are firstly punched; slow setting cement grout preparation materials comprising cement, water, sodium-based bentonite, a retarder and sodium carboxymethylcellulose are got ready according to the grout use level per pool; water is added into the retarder and the sodium carboxymethylcellulose to dissolve the retarder and the sodium carboxymethylcellulose, and the needed water quantity is deducted from the total water consumption of the grout; after the retarder and the sodium carboxymethylcellulose are dissolved or nearly dissolved, water is added to a stirring pool; a machine is started to stir the water, and the cement and the sodium-based bentonite are poured into the water in sequence; the cement grout is enabled to flow into a grout storing pool to be temporarily stored; a grout injecting pump is started and the grout in the grout storing pool is once pumped into the freezing holes; after the grout is injected, a mud sucking pipe of a mud pump is immediately transferred to a mud pool; a fixed quantity of mud is compressed into a pipeline and the quantity of the mud has to be accurately measured; and after follow-up mud compression and injection are completed, a drill rod is rapidly lifted up and a drilling template is cleaned, so as to switch to a freezing pipe sinking operation. The water sealing method has the advantages that mud of the freezing holes is replaced at high quality.
Description
Technical field
The present invention relates to freezing hole mud water shutoff technical field, specifically is a kind of retarded cement slurries and displacement freezing hole mud water shutoff method thereof.
Background technology
In the pit shaft construction project, along with the increase that press on the increase and the ground of the degree of depth, the difficulty that pre grouting from the surface and pre grouting from the working face are harnessed the river is increasing usually, and effect also more and more cannot say for sure to demonstrate,prove; Especially to the rock stratum of the parallel cranny development of high angle, or be rich in the sand layers of pore water, slip casting effect is difficult to guarantee especially.
Erdos area adopts some pit shafts of complete dark freeze-wellboring technology construction, and after frost wall thawed, the outer annular space of freezing hole and freezing pipe was prone to become vertical conduit pipe, and mine safety in serious threat.In recent years, in the partial wells tube construction of this area, similar accident once took place, and the well accident was also once flooded because of the freezing hole water guide between mine construction stage in the Yang Zhuan colliery in mining area, China Yanzhou, caused serious economy loss.It is thus clear that, in the complete dark freeze-wellboring construction, the vertical conduit pipe of freezing hole is carried out water shutoff handle, be important measures that guarantee mine construction safety.
The vertical conduit pipe water shutoff of so-called freezing hole is handled, and finishes at freezing hole construction exactly, before freezing pipe transfers, earlier the mud in the boring in the above certain altitude scope at the bottom of the hole is replaced with extended slurry, transfers freezing pipe again.Through the curing of retarded cement slurries, realize the gluing on freezing pipe and stratum, block conduit pipe, reach the effect of solid pipe water shutoff.Extended slurry has certain slow setting time, and the calculus rate is higher, and the calculus body has higher intensity with impervious.
The secondary vertical freezing engineering in Men Keqing colliery; Because formation properties is comparatively complicated, need the more chemical admixture of admixture in the freezing borehole mud, thereby in the cement paste replacement process; Influence the performance indications such as time of setting of cement grout; Thereby preparation can be compatible with drilling slurry, has good flowability, stability, the reasonable retarded cement slurries of time of setting, is the important and key issue that freezing hole is managed the water shutoff technical research admittedly.
After guaranteeing that freezing shaft thaws, mine does not receive the threat of upper formation water, avoids field with "nine squares" superficial part water resource to run off simultaneously, needs that when freezing hole construction freezing hole is carried out water shutoff and handles.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The present invention provides a kind of retarded cement slurries and displacement freezing hole mud water shutoff method thereof, improves the stability of cement grout, prolongs the cement granules sedimentation time; Improve slurries calculus rate, accomplished freezing hole cement paste displacement work in high quality.
The present invention realizes with following technical scheme: a kind of retarded cement slurries displacement freezing hole mud water shutoff method, and the basic cement grout proportioning of employing is: water/binder ratio 1～1.25: 1; Admixture weight is 1.5～2% suspending agent and retarding agent in basic cement grout; Described retarding agent is the mixture of one or both and two or more any mixing ratios in sodium phosphate trimer, tartaric acid, sodium potassium tartrate tetrahydrate, citric acid or six kinds of retarding agent of zinc chloride; The volume 0.1%～0.5% of sodium pyrophosphate wherein; Sodium phosphate trimer volume 0.1%～0.6%, tartaric volume 0.2%～0.4%, the volume 0.4%～0.5% of sodium potassium tartrate tetrahydrate, the volume 0.05%～0.35% of citric acid; The volume 0.2%～0.3% of zinc chloride; Also be mixed with 0.8～1% sodium carboxymethylcellulose in the above-mentioned mixed liquor; Above-mentioned suspending agent is a sodium bentonite; The concrete grammar step is following:
(1) before cement paste stirs, earlier freezing hole is carried out punching;
(2) be ready to retarded cement slurries its preparing materials by every pond slurries consumption: cement, water, sodium bentonite, retarding agent and sodium carboxymethylcellulose;
(3) retarding agent and sodium carboxymethylcellulose are added water and dissolve, institute's water requirement is deducted from slurries total water amount;
(4) dissolving of retarding agent and sodium carboxymethylcellulose finishes or closes on when finishing, and adds water in the stirring pool, and start is stirred, and pours cement, sodium bentonite successively into;
(5) cement paste stir about 3min after stirring basically, mixes retarding agent liquid, continues to stir 3min; Then carboxymethylcellulose sodium solution is added, stir 3min again, cement grout stirs to be accomplished;
(6) pipeline valve between unlatching stirring pool and the pulp storage tank, it is temporary to make cement grout flow into pulp storage tank;
(7) open grouting pump, the disposable freezing hole that pumps into of the slurries in the pulp storage tank;
(8) slurries inject and finish, and immediately the slush pump pulp-absorbing pipe are gone to mud pit, in pipeline, are pressed into quantitative mud, and mud amount is metering accurately; The computational methods of mud are following:
1), calculates under the no drilling rod condition overall height of cement paste post in freezing hole at first according to cement paste cumulative volume and bore diameter;
2) ignore the drilling rod internal and external pressure balance; Suppose that the uncovered drilling rod in bottom inserts in the cement paste; And the drilling rod bar wall body of insertion portion amasss in whole " suck-back is gone into " drilling rods of shared mud; With this understanding, according to the interior external diameter of cement paste post height, drilling rod in the hole, it is long-pending to calculate it bar wall body that " is inserted into the part in the cement paste " of drilling rod; And then, converse the cement column discrepancy in elevation outer in the drilling rod with respect to drilling rod;
3) in the drilling rod under the known prerequisite of cement column overall height, calculate the inside clear space of top rod, calculate the inside clear space of well head to ground pipeline between the mud pit again, sum of the two is needs the follow-up mud amount that is pressed into;
(9) follow-up mud is pressed to annotate and is finished, and carries drilling rod on rapidly, and the cleaning temporary guide base changes freezing pipe sinking operation over to.
Advantage of the present invention is: accomplish freezing hole cement paste displacement work in high quality.
The specific embodiment
Retarded cement slurries displacement freezing hole mud water shutoff method, the basic cement grout proportioning of employing is: water/binder ratio 1～1.25: 1; Admixture weight is 1.5～2% suspending agent and retarding agent in basic cement grout; Described retarding agent is the mixture of one or both and two or more any mixing ratios in sodium phosphate trimer, tartaric acid, sodium potassium tartrate tetrahydrate, citric acid or six kinds of retarding agent of zinc chloride; The volume 0.1%～0.5% of sodium pyrophosphate wherein; Sodium phosphate trimer volume 0.1%～0.6%, tartaric volume 0.2%～0.4%, the volume 0.4%～0.5% of sodium potassium tartrate tetrahydrate, the volume 0.05%～0.35% of citric acid; The volume 0.2%～0.3% of zinc chloride; Also be mixed with 0.8～1% sodium carboxymethylcellulose in the above-mentioned mixed liquor; Above-mentioned suspending agent is a sodium bentonite; The concrete grammar step is following:
(1) before cement paste stirs, earlier freezing hole is carried out punching;
(2) be ready to retarded cement slurries its preparing materials by every pond slurries consumption: cement, water, sodium bentonite, retarding agent and sodium carboxymethylcellulose;
(3) retarding agent and sodium carboxymethylcellulose are added water and dissolve, institute's water requirement is deducted from slurries total water amount;
(4) dissolving of retarding agent and sodium carboxymethylcellulose finishes or closes on when finishing, and adds water in the stirring pool, and start is stirred, and pours cement, sodium bentonite successively into;
(5) cement paste stir about 3min after stirring basically, mixes retarding agent liquid, continues to stir 3min; Then carboxymethylcellulose sodium solution is added, stir 3min again, cement grout stirs to be accomplished;
(6) pipeline valve between unlatching stirring pool and the pulp storage tank, it is temporary to make cement grout flow into pulp storage tank;
(7) open grouting pump, the disposable freezing hole that pumps into of the slurries in the pulp storage tank;
(8) slurries inject and finish, and immediately the slush pump pulp-absorbing pipe are gone to mud pit, in pipeline, are pressed into quantitative mud, and mud amount is metering accurately; The computational methods of mud are following:
1), calculates under the no drilling rod condition overall height of cement paste post in freezing hole at first according to cement paste cumulative volume and bore diameter;
2) ignore the drilling rod internal and external pressure balance; Suppose that the uncovered drilling rod in bottom inserts in the cement paste; And the drilling rod bar wall body of insertion portion amasss in whole " suck-back is gone into " drilling rods of shared mud; With this understanding, according to the interior external diameter of cement paste post height, drilling rod in the hole, it is long-pending to calculate it bar wall body that " is inserted into the part in the cement paste " of drilling rod; And then, converse the cement column discrepancy in elevation outer in the drilling rod with respect to drilling rod;
3) in the drilling rod under the known prerequisite of cement column overall height, calculate the inside clear space of top rod, calculate the inside clear space of well head to ground pipeline between the mud pit again, sum of the two is needs the follow-up mud amount that is pressed into;
(9) follow-up mud is pressed to annotate and is finished, and carries drilling rod on rapidly, and the cleaning temporary guide base changes freezing pipe sinking operation over to.
Embodiment:
The mixture of preferred sodium phosphate trimer of retarding agent and citric acid; The volume 0.50～0.6% of sodium phosphate trimer, the volume 0.2～0.3% of citric acid, the temperature of retarded cement slurries is 35～40 ℃.
(1) before cement paste stirs, earlier freezing hole is carried out punching;
(2) be ready to retarded cement slurries its preparing materials by every pond slurries consumption: cement, water, sodium bentonite, sodium phosphate trimer, citric acid and sodium carboxymethylcellulose;
(3) sodium phosphate trimer citric acid and sodium carboxymethylcellulose are added water and dissolve, institute's water requirement is deducted from slurries total water amount;
(4) sodium phosphate trimer, citric acid and sodium carboxymethylcellulose dissolving finish or close on when finishing, and add water in the stirring pool, and start is stirred, and pours cement, sodium bentonite successively into;
(5) cement paste stir about 3min after stirring basically, mixes sodium phosphate trimer and citric acid solution, continues to stir 3min; Then carboxymethylcellulose sodium solution is added, stir 3min again, cement grout stirs to be accomplished;
(6) pipeline valve between unlatching stirring pool and the pulp storage tank, it is temporary to make cement grout flow into pulp storage tank;
(7) open grouting pump, the disposable freezing hole that pumps into of the slurries in the pulp storage tank;
(8) slurries inject and finish, and immediately the slush pump pulp-absorbing pipe are gone to mud pit, in pipeline, are pressed into quantitative mud, and mud amount is metering accurately; The computational methods of mud are following:
1), calculates under the no drilling rod condition overall height of cement paste post in freezing hole at first according to cement paste cumulative volume and bore diameter;
2) ignore the drilling rod internal and external pressure balance; Suppose that the uncovered drilling rod in bottom inserts in the cement paste; And the drilling rod bar wall body of insertion portion amasss in whole " suck-back is gone into " drilling rods of shared mud; With this understanding, according to the interior external diameter of cement paste post height, drilling rod in the hole, it is long-pending to calculate it bar wall body that " is inserted into the part in the cement paste " of drilling rod; And then, converse the cement column discrepancy in elevation outer in the drilling rod with respect to drilling rod;
3) in the drilling rod under the known prerequisite of cement column overall height, calculate the inside clear space of top rod, calculate the inside clear space of well head to ground pipeline between the mud pit again, sum of the two is needs the follow-up mud amount that is pressed into;
(9) follow-up mud is pressed to annotate and is finished, and carries drilling rod on rapidly, and the cleaning temporary guide base changes freezing pipe sinking operation over to.Technology measure is following:
(1) special messenger is responsible for required cement grout of each freezing hole mud displacement and material usage calculating thereof.In case any initial parameter changes like hole depth, ground pipeline length etc., slurries consumption and corresponding material usage must recomputate, and the mud amount that follow-up need are pressed into also must recomputate.
(2) special messenger is responsible for the metering of cement grout Admixture, guarantees Admixture, and especially the measuring accuracy of retarding agent meets the requirements to guarantee grout coordinate ratio.
(3) the cement grout temperature is low more, and the slow setting time is long more.For this reason, should extract down-hole cold water preparation, forbid to use the water preparation retarded cement slurries after being exposed to the sun.
(4) accurately metering, the follow-up mud amount that is pressed into of strict control.Suppose that the concrete initial parameter of managing admittedly in an auxiliary shaft freezing hole is following: hole depth 774.3m, the aperture is by 200mm (the actual 195mm that is about), freezing pipe external diameter 133mm; Displacement height 100m; Drilling rod external diameter 89mm, internal diameter 69mm, ground pipeline (well head is to slush pump) length 63m, internal diameter is 65mm.Cement paste water/binder ratio 1.25: 1, calculus rate 71%, density 1.42t/m3.Result of calculation: the required amount of single hole sealing of hole needs slurries amount: 2.47m3; Follow-up pressure mud amount: 2.59m3.
The shutoff of considering the freezing hole annular space mainly is that the requirement cement paste has the long as far as possible initial setting time; And necessary final set; And the cement paste consolidating strength is not had specific (special) requirements; Through investigation, " chessboard well " board PO42.5 cement of finally having selected for use permanent cement plant, local sky, Etuoke Banner, Erdos to produce.
After the cement grout preparation was accomplished, As time goes on cement granules will precipitate.Because freezing pipe sinking required time is the shortest 18h is arranged also, therefore, the quick bleed of slurries, deposition will be aggravated the bottom hydrated cementitious, promote it to condense, and be unfavorable for pipe down.For this reason, should pass through the admixture suspending agent, come to improve as much as possible the stability of slurries.
Mix sodium bentonite in the cement grout, not only help to improve the stability of slurries, prolong the cement granules sedimentation time, and help to improve slurries calculus rate.Therefore, tentatively confirm admixture sodium bentonite in the cement grout.In addition, cement grout bleed, deposition are generally very fast, and its basic reason is that cement granules is bigger, and its viscosity is very low.Given this, the stability that the plan sodium carboxymethylcellulose (CMC) that further admixture has good tackify effect in cement grout comes the refinforced cement slurries is slowed down its bleed settling velocity.
Adopt above-mentioned construction technology and technical measures, begin first boring cement paste displacement operation in 2010-05-23-4:00.Slurries stir time spent 30min, then change on the drilling rod carry, freezing pipe sinking operation, accomplished first freezing hole lowering-in operation the most finally about 22:00 on that night smoothly, any phenomenon of being obstructed does not appear in the following pipe process.2010-05-24 morning, the cement paste displacement work of the 2nd, the 3rd boring also launches in succession, and accomplishes smoothly.Afterwards, adopt and use the same method, accomplished remaining 39 freezing hole cement paste displacement work smoothly.
In the complete dark freeze-wellboring engineering, it is the key technique of guaranteeing mine construction safety and the safety in production of mine later stage that freezing hole is managed water shutoff admittedly.Freezing hole is managed the solution of key technical problem such as sink smoothly of retarded cement slurries preparation that water shutoff faces and freezing pipe admittedly, not only has the engineering practical value, also has very important significance for theories.Realized the displacement of freezing hole retarded cement slurries through said method, and calculated, accomplished freezing hole cement paste displacement work in high quality smoothly through the slurries consumption and the follow-up required mud amount that is pressed into of strictness.Practice shows that this retarded cement slurry formula can be applicable to similar stratum, area, the Inner Mongol fully.
Claims (2)
1. retarded cement slurries are replaced freezing hole mud water shutoff method, and the basic cement grout proportioning of employing is: water/binder ratio 1～1.25: 1; Admixture weight is 1.5～2% suspending agent and retarding agent in basic cement grout; Described retarding agent is the mixture of one or both and two or more any mixing ratios in sodium phosphate trimer, tartaric acid, sodium potassium tartrate tetrahydrate, citric acid or six kinds of retarding agent of zinc chloride; The volume 0.1%～0.5% of sodium pyrophosphate wherein; Sodium phosphate trimer volume 0.1%～0.6%, tartaric volume 0.2%～0.4%, the volume 0.4%～0.5% of sodium potassium tartrate tetrahydrate, the volume 0.05%～0.35% of citric acid; The volume 0.2%～0.3% of zinc chloride; Also be mixed with 0.8～1% sodium carboxymethylcellulose in the above-mentioned mixed liquor; Above-mentioned suspending agent is a sodium bentonite; It is characterized in that: the concrete grammar step is following:
(1) before cement paste stirs, earlier freezing hole is carried out punching;
(2) be ready to retarded cement slurries its preparing materials by every pond slurries consumption: cement, water, sodium bentonite, retarding agent and sodium carboxymethylcellulose;
(3) retarding agent and sodium carboxymethylcellulose are added water and dissolve, institute's water requirement is deducted from slurries total water amount;
(4) dissolving of retarding agent and sodium carboxymethylcellulose finishes or closes on when finishing, and adds water in the stirring pool, and start is stirred, and pours cement, sodium bentonite successively into;
(5) cement paste stir about 3min after stirring basically, mixes retarding agent liquid, continues to stir 3min; Then carboxymethylcellulose sodium solution is added, stir 3min again, cement grout stirs to be accomplished;
(6) pipeline valve between unlatching stirring pool and the pulp storage tank, it is temporary to make cement grout flow into pulp storage tank;
(7) open grouting pump, the disposable freezing hole that pumps into of the slurries in the pulp storage tank;
(8) slurries inject and finish, and immediately the slush pump pulp-absorbing pipe are gone to mud pit, in pipeline, are pressed into quantitative mud, and mud amount is metering accurately; The computational methods of mud are following:
1), calculates under the no drilling rod condition overall height of cement paste post in freezing hole at first according to cement paste cumulative volume and bore diameter;
2) ignore the drilling rod internal and external pressure balance; Suppose that the uncovered drilling rod in bottom inserts in the cement paste; And the drilling rod bar wall body of insertion portion amasss in whole " suck-back is gone into " drilling rods of shared mud; With this understanding, according to the interior external diameter of cement paste post height, drilling rod in the hole, it is long-pending to calculate it bar wall body that " is inserted into the part in the cement paste " of drilling rod; And then, converse the cement column discrepancy in elevation outer in the drilling rod with respect to drilling rod;
3) in the drilling rod under the known prerequisite of cement column overall height, calculate the inside clear space of top rod, calculate the inside clear space of well head to ground pipeline between the mud pit again, sum of the two is needs the follow-up mud amount that is pressed into;
(9) follow-up mud is pressed to annotate and is finished, and carries drilling rod on rapidly, and the cleaning temporary guide base changes freezing pipe sinking operation over to.
2. retarded cement slurries displacement freezing hole mud water shutoff method according to claim 1, it is characterized in that: described retarding agent is the mixture of sodium phosphate trimer and citric acid; The volume 0.50～0.6% of sodium phosphate trimer, the volume 0.2～0.3% of citric acid.
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Cited By (6)
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| CN103938613A (en) * | 2014-04-08 | 2014-07-23 | 北方燕盛工程技术有限公司 | Freezing pipe injected grout non-return device |
| CN104045312A (en) * | 2014-06-18 | 2014-09-17 | 天地科技股份有限公司 | Operating fluid for mud replaced by delayed coagulation cement paste in freezing method construction and method thereof |
| CN104060992A (en) * | 2014-06-18 | 2014-09-24 | 天地科技股份有限公司 | Mud replacement device by long-setting liquid cement during freezing method construction |
| CN105236867A (en) * | 2015-09-28 | 2016-01-13 | 中煤特殊凿井有限责任公司 | Cement mortar for filling freezing pipes and freezing pipe filling technology |
| CN104310847B (en) * | 2014-10-14 | 2017-02-15 | 中国电建集团中南勘测设计研究院有限公司 | Retarding high sulfate-resistant cement stable slurry |
| CN106979012A (en) * | 2017-05-25 | 2017-07-25 | 兖州煤业股份有限公司 | Hidden conduit pipe Comprehensive Treatment method in shaft of vertical well freezing hole |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938613A (en) * | 2014-04-08 | 2014-07-23 | 北方燕盛工程技术有限公司 | Freezing pipe injected grout non-return device |
| CN103938613B (en) * | 2014-04-08 | 2016-01-20 | 北方燕盛工程技术有限公司 | Freezing pipe slip casting check device |
| CN104045312A (en) * | 2014-06-18 | 2014-09-17 | 天地科技股份有限公司 | Operating fluid for mud replaced by delayed coagulation cement paste in freezing method construction and method thereof |
| CN104060992A (en) * | 2014-06-18 | 2014-09-24 | 天地科技股份有限公司 | Mud replacement device by long-setting liquid cement during freezing method construction |
| CN104060992B (en) * | 2014-06-18 | 2016-03-09 | 天地科技股份有限公司 | Extended slurry displacement mud device in construction freezing method |
| CN104310847B (en) * | 2014-10-14 | 2017-02-15 | 中国电建集团中南勘测设计研究院有限公司 | Retarding high sulfate-resistant cement stable slurry |
| CN105236867A (en) * | 2015-09-28 | 2016-01-13 | 中煤特殊凿井有限责任公司 | Cement mortar for filling freezing pipes and freezing pipe filling technology |
| CN105236867B (en) * | 2015-09-28 | 2018-04-20 | 中煤特殊凿井有限责任公司 | Freezing pipe filling cement mortar and freezing pipe filling process |
| CN106979012A (en) * | 2017-05-25 | 2017-07-25 | 兖州煤业股份有限公司 | Hidden conduit pipe Comprehensive Treatment method in shaft of vertical well freezing hole |
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| CN102505944B (en) | 2014-08-13 |
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