CN101798919B - Method for monitoring whether drilling mud is invaded by grouting fluid during drilling and grouting parallel operation - Google Patents
Method for monitoring whether drilling mud is invaded by grouting fluid during drilling and grouting parallel operation Download PDFInfo
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Abstract
The invention relates to a method for monitoring whether drilling mud is invaded by grouting fluid during drilling and grouting parallel operation. The specific monitoring processes are that: a pH value online monitoring system is established, the system comprises a sensor, a monitoring instrument and a computer, and the sensor is arranged at a position close to a mud nozzle, wherein the flow rate of mud liquid at the position is 0.6-1.2m/min and the mud liquid at the position contains less sand when being viewed by naked eyes; and the monitoring instrument measures the real-time pH value of mud, the computer compares the real-time pH value with a preset warning value, when the pH value of the mud is higher than the warning value, a corresponding signal is sent out and a grouting pump is paused or shut down according to the signal. By adopting the method of monitoring the pH value of the mud at the drilling mud outlet, whether the drilling mud is invaded by the grouting liquid during the drilling and grouting parallel operation can be intuitively and reliably monitored and thereby effective measures can be taken to ensure the safety of the drilling and grouting parallel operation.
Description
Technical field:
The present invention relates to sinking by boring and slip casting method and construct when carrying out simultaneously, whether invade the monitoring method of injection slurry in the drilling mud.
Background technology:
Boring method " is dug a well and is not gone into the well ", mechanization degree is high, safe and reliable, become the well quality good, in Thick Surface Soils, to dig the reliable construction technology of shaft of vertical well, but often need repeatedly to expand the well prefabricated lining that sinks again, speed of application is slow, long in time limit, and when deep bedrock aquifer slip casting method is constructed, need to finish first the rock section mortar depositing construction, carry out again the alluvium wellbore construction, cause the pit shaft construction period long.According to present construction technology level, if the shaft of vertical well that 1000m is dark, alluvium 600m is thick, adopts wellbore construction to need more than 2 years, and rock section aquifer, bottom pre grouting from the surface needs 10～12 months; The average speed 64m/ month is built in whole nation shaft of vertical well basement rock pick, and by slip casting-drilling well-sinking shaft sequence construction, the construction period of whole shaft of vertical well approximately needs the time in 4～5 years.If realize the parallel operations of boring method and slip casting method two large working procedures, can save significantly total construction period.
If but in boring the drilling-grouting parallel operation process injection slurry invade sneak into mud in the bored shaft after, the fluid loss of mud is increased, destroy its stability, thereby destroy the performance of drilling mud, affect normally creeping into of sinking by boring, serious meeting damages drilling well well side, causes the hole of collapsing, may cause serious accident, affect the drilling well duration.
So in drilling process, strengthen the monitoring to drilling mud, prevent that injection slurry from invading in the drilling mud, be the necessary condition that realizes that brill-drilling-grouting parallel operation carries out smoothly.
Summary of the invention:
Technical problem to be solved by this invention provides sinking by boring and slip casting method is constructed when carrying out simultaneously, whether invades the monitoring method of injection slurry in the drilling mud, thereby provides safety guarantee for boring drilling-grouting parallel operation.
For solving the problems of the technologies described above, technical scheme of the present invention is:
Set up pH value on-line monitoring system, this system comprises sensor, monitoring instrument and computer, wherein sensor is selected sunk pH value sensor, and sensor is placed in that slurry flow rate is 0.6～1.2m/min, with the naked eye relatively sand content is relatively less and near the mud nozzle place; The live signal that monitoring instrument is sent by sensor, measure the real-time pH value of mud, and this numerical value is transferred to computer, computer is compared to predefined numerical value and real-time pH value, when mud pH value is higher than the caution value, send alarm signal, suspend slip casting this moment, and the various performance parameters of mud is tested, if other do not change other parameters of mud, continue slip casting, if other parameters all change, then stop slip casting; When mud pH value reaches the warning value, send alarm signal, turn off grouting pump; When the pH value has burst to change, wouldn't give a warning; When burst changes when the short time can't eliminate, send alarm signal.
The setting of described caution, warning value, the pH value according to institute's drilling well during with drilling mud, injection slurry and mud and injection slurry different blended composition and division in a proportion are compared and are determined afterwards; Wherein caution value is preferably 8.0, and the warning value is preferably 8.5.
Described monitoring instrument comprises pH value measurement module, and measurement module is measured the pH value of mud according to the live signal of sensor, and the resolution ratio of measurement module is not less than 0.01, the limit of error is not more than ± and 0.002.
The present invention has following beneficial effect: adopt the method in drilling mud exit monitoring mud pH value, what energy was intuitive and reliable monitors whether injection slurry invades in the drilling mud when boring drilling-grouting parallel operation, and then the safety of the assurance brill drilling-grouting parallel operation of adopting an effective measure, the method is simple, quick in addition, is a kind of desirable monitoring method.
The specific embodiment:
Respectively test described ratio in following examples and be mass percent.
The following pH value of respectively testing detects the SevenMultis type pH/ electrical conductivity that used pH meter is Mettler Toledo Inc./ion comprehensive tester.
At first by following injection slurry to each parameter influence experiment of drilling mud, illustrate to select this parameter of mud pH value as the index of monitoring why:
Took on-the-spot injection slurry on July 14th, 2009, join in the table soil section drilling mud by different proportion, the variation of each parameter of mud sees the following form 1:
Table 1 injection slurry his-and-hers watches soil section drilling mud parameter influence
September in 2009 enchashment field on the 12nd injection slurry, join in the rock section drilling mud by different proportion, the variation of each parameter of mud sees the following form 2.
Table 2 injection slurry is to rock section drilling mud parameter influence
| Prescription/project | Apparent viscosity mPas | Plastic viscosity mPas | Yield value Pa | Gel strength Pa | Density g/cm 3 | The pH value | Fluid loss ml/30min |
| 2009.9.12 8:30 injection slurry early | 1.195 | 12 | |||||
| 2009.9.12 8:30 drilling mud early | 15.50 | 10.00 | 5.62 | 7.15 | 1.157 | 7 | 22.7 |
| Mud+1% injection slurry | 17.50 | 11.00 | 6.64 | 8.69 | 1.156 | 9 | 25.5 |
| Mud+2% injection slurry | 19.00 | 12.00 | 7.15 | 9.71 | 1.57 | 9.5 | 28.2 |
| Mud+3% injection slurry | 23.00 | 12.00 | 11.24 | 12.78 | 1.57 | 9.8 | 29 |
| Mud+4% injection slurry | 24.00 | 13.00 | 11.24 | 13.80 | 1.58 | 10 | 30 |
| Mud+5% injection slurry | 24.50 | 12.00 | 12.78 | 17.89 | 1.58 | 11 | 33.2 |
| Mud+6% injection slurry | 28.00 | 9.00 | 19.42 | 31.68 | 1.6 |
From upper table 1,2 can find out, the ratio that joins in the mud along with injection slurry constantly increases, each parameter has variation in various degree in the mud, wherein shear force changes maximum, next is pH value and viscosity, so think, after injection slurry joins in the mud, mud changes apparent in view parameter, be that sensitive parameter is the viscosity of mud, shear force and pH value, but apparent in view variation also can occur in the viscosity of mud and shear force usually when boring the chance Different Strata, inartificial when carrying out mud conditioning, the pH value of only having mud is substantially constant, is not subjected to drilling parameter, the impact of the factors such as drilling strata, and shear force is the parameter that is difficult for monitoring, generally need to can obtain a result indoor the experiment, can not monitor intuitively.Generally all about 12, as long as injection slurry invades in the drilling mud, the pH value of mud will change the pH value of injection slurry.So, monitor whether injection slurry is blended in the mud in the Practical Project, mainly can monitor the pH value of mud.
Then by following injection slurry on the impact of drilling mud pH value experiment, determine to invade in the mud Changing Pattern of pH value behind the injection slurry, and further specify selection pH value as the feasibility of monitoring parameter:
What kind of drilling mud pH value had affect rule in order to seek injection slurry, indoorly prepared respectively various different formulations injection slurries, join respectively in the drilling mud in proportion, measure its pH value, experimental result is as follows:
1, single liquid slurry is on the impact of drilling mud pH value
The single liquid slurry of autogamy: water/binder ratio 1: 1, NaCl dosage are 5% of cement, and the triethanolamine dosage is 5 ‰ of cement dosage, density 1.528kg/m3.
The single liquid slurry of autogamy is joined in the mud by different proportion, and when adding 1%, it is very thick that mud namely becomes, and is difficult to measure its rheological parameter.Record its pH value with pH meter and see the following form 3:
The single liquid slurry of table 3 is on the impact of drilling mud pH value
| Prescription | pH |
| September 13 the 10:00 drilling mud | 7.342 |
| The single liquid slurry of mud+0.5% | 9.988 |
| The single liquid slurry of mud+1% | 10.153 |
| The single liquid slurry of mud+2% | 10.776 |
| The single liquid slurry of mud+3% | 11.168 |
| The single liquid slurry of mud+4% | 11.298 |
| Single liquid slurry | 11.492 |
2, rarer injection slurry is on the impact of drilling mud pH value
The rarer injection slurry of autogamy: magma proportion 1.1kg/m3, cement 150kg, 15 liters of water glass, injection slurry density 1.197kg/m3.
The rarer injection slurry of table 4 is on the impact of drilling mud pH value
| Prescription | pH |
| September 14 the 8:30 drilling mud | 7.342 |
| Mud+1% injection slurry | 9.019 |
| Mud+2% injection slurry | 9.498 |
| Mud+3% injection slurry | 10.242 |
| Mud+4% injection slurry | 10.566 |
| Mud+5% injection slurry | 10.684 |
| Injection slurry | 11.705 |
3, injection slurry commonly used is on the impact of drilling mud pH value
Injection slurry is commonly used in autogamy: magma proportion 1.12kg/m3, cement 150kg, 15 liters of water glass, injection slurry density 1.231kg/m3.
Table 5 injection slurry commonly used is on the impact of drilling mud pH value
| Prescription | pH |
| September 14 the 8:30 drilling mud | 7.342 |
| Mud+1% injection slurry | 9.738 |
| Mud+2% injection slurry | 10.122 |
| Mud+3% injection slurry | 10.33 |
| Mud+4% injection slurry | 10.637 |
| Mud+5% injection slurry | 10.799 |
| Injection slurry | 11.701 |
4, thicker injection slurry is on the impact of drilling mud pH value
The thicker injection slurry of autogamy: magma proportion 1.1kg/m3, cement 200kg, 20 liters of water glass, injection slurry density 1.239kg/m3.
The thicker injection slurry of table 6 is on the impact of drilling mud pH value
| Prescription | pH |
| September 14 the 8:30 drilling mud | 7.342 |
| Mud+1% injection slurry | 10.152 |
| Mud+2% injection slurry | 10.207 |
| Mud+3% injection slurry | 10.596 |
| Mud+4% injection slurry | 10.817 |
| Mud+5% injection slurry | 10.962 |
| Injection slurry | 11.78 |
5, interpretation
In the situation that do not carry out specially treated, the pH value of mud is generally all less than 8.0, and can find out from above experimental result, when injection slurry joined in the mud, along with the gradually increase of injection slurry dosage, the pH value of mud all increased gradually, when each prescription injection slurry joins ratio in the mud and is 1%, the Changing Pattern of mud pH value is: the pH value is all greater than 9, and namely obvious variation has occured the pH value, than being easier to monitor out the result.
The slurry-outlet quantity of drilling mud is about 1200m
3/ h, grouting amount is 14m approximately
3/ h accounts for 1% of mud slurry-outlet quantity.Slip casting is all in the bottom of drilling well, if injection slurry is scurried in the mud, can only scurry into from the bottom of drilling well, and anti-circulation well cleanup mode is adopted in drilling well, the mud at work plane place, drilling well bottom can directly be drawn onto grout outlet, that is to say, if injection slurry is scurried in the mud, can monitor at the grout outlet place soon.
In normal drilling process, there is not any factor can cause the variation of mud pH value, so the pH value of mud is generally constant, front and back can not surpass 0.5 variation.Therefore, in boring the drilling-grouting parallel operation process, whether as long as the pH value of monitoring drilling mud, just can judge has injection slurry to invade in the drilling mud.
We monitor the pH value of drilling mud in boring the drilling-grouting parallel operation process at last, and concrete observation process is as follows:
1, sets up pH value on-line monitoring system, this system comprises sensor, monitoring instrument and computer, sensor is connected by transmission cable with monitoring instrument, transmission cable preferably adopts multicore shielding armouring exploration cable, the life-span of selecting armored cable to help to keep monitoring cable, and in installation process, can utilize cable that sensor is partly carried out lifting operation.The accurate processes sensor signal of monitoring instrument measuring accurately pH value, and transfers to computer with this numerical value through the RS232 interface, certainly also can adopt other forms of interface to link to each other with computer and realize transfer of data; The scope that the measurement category of monitoring instrument should satisfy transducer calibration and set the monitoring, alarming value; Because native system need to carry out anticipation and judgement work by record pH Value Data, therefore monitoring instrument need use resolution ratio to be not less than pH value 0.01, the limit of error is not more than ± 0.002 measurement module; In addition, monitoring instrument should provide the state of measuring transducer to show, sensor is damaged should be able to provide demonstration.Software is finished pH value and other recording of information that detects, comparison in the computer, and uses the method for gradual judgement that signal is reported by mistake and judge; Simultaneously software preferably possesses the function that shows pH value change curve or changing trend diagram, watches and analyzes monitoring result for the Field Force.
2, the selection of sensor installation position: adopt sunk pH value sensor, the installation of sensors position close mud nozzle of should trying one's best, slurry fluidity is better, and flow velocity is moderate and contain the lower place of sand content.The slurry flow rate of measured place should be controlled at 0.6～1.2m/min, and flow velocity is crossed the monitoring promptness will be descended, and easily wraps up at sensor surface formation mud suitcase, thereby reduces certainty of measurement; The too fast then sensor surface of flow velocity is subjected to the sand erosion that suspends in the mud, and the rate of wear is accelerated, and reduces its application life.
3, concrete monitor signal processing mode: because the pH value of different drilling muds is differentiated, so the pH value when needing to detect institute's drilling well drilling mud, injection slurry and drilling mud from the different mixing match of injection slurry before monitoring, those skilled in the art are according to caution value and the warning value of conventional experience and method and these pH values setting monitoring usefulness; Monitoring shows when mud pH value reaches the caution value, send alarm signal, suspend slip casting this moment, continue to observe mud and change, and do the various performance parameters test of mud, if what variation is other parameters do not have, continue slip casting, if other parameters all change, suspect that then injection slurry has invaded in the drilling mud, should stop slip casting.When mud pH value reaches the warning value, send alarm signal, should turn off grouting pump this moment, stops slip casting.When the pH value has burst to change, as when not meeting pH value gradual change, then should be judged as abnormal signal, and wouldn't give a warning, but should check checkout equipment this moment, and detect the mud parameter situation of change, when burst changes when the short time can't eliminate, then send alarm signal.
The below is twice monitoring adopting said method to carry out, the SevenNulti type pH/ electrical conductivity that monitoring instrument use Mettler Toledo Inc. produces/ion comprehensive tester, and model is " S40K ", pH value electrode model is LE438; Because of the pH value of mud usually below 8.0, so the caution value of this twice monitoring is set as 8.0, the warning value is set as 8.5, concrete monitored data sees Table 7,8:
Table 72,009 13, drilling mud pH on September value monitoring result
| Date | Time | Result | Result unit | Temperature | Temp.Unit |
| 2009-9-13 | 16:44:00 | 7.395 | pH | 24.8 | ℃ |
| 2009-9-13 | 16:44:03 | 7.396 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:06 | 7.396 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:09 | 7.397 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:12 | 7.397 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:15 | 7.398 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:18 | 7.397 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:21 | 7.396 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:44:24 | 7.396 | pH | 24.9 | ℃ |
| 2009-9-13 | 16:52:38 | 7.395 | pH | 25 | ℃ |
| 2009-9-13 | 16:52:41 | 7.395 | pH | 25 | ℃ |
| 2009-9-13 | 16:52:44 | 7.396 | pH | 25 | ℃ |
| 2009-9-13 | 16:52:47 | 7.395 | pH | 25 | ℃ |
| 2009-9-13 | 16:52:50 | 7.396 | pH | 25 | ℃ |
| 2009-9-13 | 16:52:54 | 7.395 | pH | 25 | ℃ |
| 2009-9-13 | 16:52:56 | 7.395 | pH | 25.1 | ℃ |
| 2009-9-13 | 16:53:00 | 7.396 | pH | 25 | ℃ |
| 2009-9-13 | 16:55:48 | 7.394 | pH | 25.1 | ℃ |
| 2009-9-13 | 16:55:51 | 7.394 | pH | 25.1 | ℃ |
| 2009-9-13 | 16:55:54 | 7.394 | pH | 25.1 | ℃ |
| 2009-9-13 | 16:55:57 | 7.394 | pH | 25.1 | ℃ |
| 2009-9-13 | 16:56:00 | 7.393 | pH | 25.1 | ℃ |
| 2009-9-13 | 16:56:03 | 7.394 | pH | 25.1 | ℃ |
Table 82,009 15, drilling mud pH on September value monitoring result
| Date | Time | Result | Result unit | Temperature | Temp.Unit |
| 209-9-15 | 1:25:36 | 7.561 | pH | 23 | ℃ |
| 2009-9-15 | 11:28:03 | 7.512 | pH | 22.9 | ℃ |
| 2009-9-15 | 11:28:06 | 7.512 | pH | 22.9 | ℃ |
| 2009-9-15 | 11:29:06 | 7.511 | pH | 22.9 | ℃ |
| 2009-9-15 | 11:30:06 | 7.509 | pH | 22.9 | ℃ |
| 2009-9-15 | 11:31:07 | 7.508 | pH | 22.9 | ℃ |
| 2009-9-15 | 11:32:07 | 7.507 | pH | 22.9 | ℃ |
| 2009-9-15 | 11:33:07 | 7.505 | pH | 22.8 | ℃ |
| 2009-9-15 | 11:34:08 | 7.503 | pH | 22.8 | ℃ |
| 2009-9-15 | 11:35:08 | 7.503 | pH | 22.8 | ℃ |
| 2009-9-15 | 11:36:08 | 7.502 | pH | 22.8 | ℃ |
| 2009-9-15 | 11:37:09 | 7.5 | pH | 22.8 | ℃ |
| 2009-9-15 | 11:38:09 | 7.499 | pH | 22.8 | ℃ |
| 2009-9-15 | 11:39:09 | 7.498 | pH | 22.8 | ℃ |
Can find out by top two days monitoring result, the pH value of this drilling mud on the two is very stable, does not invade injection slurry.
Claims (4)
1. one kind is bored the monitoring method of whether invading injection slurry in the drilling-grouting parallel operation in the drilling mud, concrete observation process is: set up pH value on-line monitoring system, this system comprises sensor, monitoring instrument and computer, wherein sensor is selected sunk pH value sensor, and sensor is placed in that slurry flow rate is 0.6～1.2m/min, with the naked eye relatively sand content is relatively less and near the mud nozzle place; Monitoring instrument is measured the real-time pH value of mud by the live signal that sensor sends, and this numerical value is transferred to computer; Preset caution value and warning value in the computer, and real-time pH value and predefined caution, warning value compared, when mud pH value is higher than the caution value, send alarm signal, suspend slip casting this moment, and the various performance parameters of mud is tested, if other parameters of mud do not change, continue slip casting, if other parameters all change, then stop slip casting; When mud pH value reaches the warning value, send alarm signal, close grouting pump; When the pH value has burst to change, wouldn't give a warning, when burst changes when the short time can't eliminate, send alarm signal.
2. according to the monitoring method of whether invading injection slurry in the drilling mud in the brill drilling-grouting parallel operation claimed in claim 1, it is characterized in that: the pH value of the basis of design institute drilling well of described caution, warning value during with drilling mud, injection slurry and mud and injection slurry different blended composition and division in a proportion compared and determined afterwards.
3. according to the monitoring method of whether invading injection slurry in the drilling mud in the brill drilling-grouting parallel operation claimed in claim 1, it is characterized in that: described caution value is 8.0, and the warning value is 8.5.
4. according to the monitoring method of whether invading injection slurry in the drilling mud in the brill drilling-grouting parallel operation claimed in claim 1, it is characterized in that: the resolution ratio of the measurement module of described monitoring instrument is not less than 0.01, and the limit of error is not more than ± and 0.002.
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| CN103477746A (en) * | 2013-09-29 | 2014-01-01 | 江苏名和集团有限公司 | Vegetation concrete pore soil alkalinity reconstruction method and device |
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