CN105372296A - Detection method of transition degree of oil-based drilling fluid - Google Patents
Detection method of transition degree of oil-based drilling fluid Download PDFInfo
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Abstract
The invention discloses a detection method of a transition degree of oil-based drilling fluid. The detection method comprises: determining a parameter preparation value: measuring the parameter of the preset oil-based drilling fluid according to the prepared oil-based drilling fluid to obtain the parameter preparation value of the preset oil-based drilling fluid; determining a parameter test value: injecting the oil-based drilling fluid into a drilling fluid circulating system if the preparation value is more than a first preset parameter threshold value, testing the preset oil-based drilling fluid parameter of a returning fluid in the drilling fluid circulating system every other first preset time in the injection process to obtain the parameter test value of the preset oil-based drilling fluid; and determining the transition degree: comparing the test value with a second preset parameter threshold value, and determining the transition degree of the oil-based drilling fluid according to the comparison result. The detection method can accurately determine whether the drilling fluid circulating system completes the transition of the oil-based drilling fluid, and is convenient for on-site staff to operate.
Description
Technical field
The present invention relates to oil-gas exploration and development technical field, specifically, relate to a kind of oil base drilling fluid conversion degree detection method.
Background technology
The drilling fluid of oil base drilling fluid to be a class oil phase be continuous phase (base oil), its have strong inhibition capability, lubricity excellent, be beneficial to the many merits such as wellbore stability and reservoir protection.Although oil base drilling fluid exists the higher deficiency of cost, it is still the effective means that drilling applications is analyzed bad ground.Oil base drilling fluid widely uses in drilling process abroad, and domestic also beginning in shale horizontal well stratigraphical drilling process is widely applied in recent years.
At the scene in application process, normally the oil base drilling fluid prepared is pumped into pit shaft by drilling rod, thus water-base drilling fluid in pit shaft is progressively converted to oil base drilling fluid.When after oil base drilling fluid conversion completely, adjustment oil base drilling fluid performance can carry out the wellbore construction on new stratum to reaching designing requirement.
But, in oil base drilling fluid conversion construction, normally by observation or discharge capacity measurement Law whether oil base drilling fluid changed and judge completely.But due to the problem that deviation or the conversion work progress of discharge capacity metering interrupt, existing method is all difficult to judge whether oil base drilling fluid is changed completely exactly.This just causes when oil base drilling fluid is changed or does not change completely, so that a large amount of water-base drilling fluids is mixed into wherein, causes oil base drilling fluid performance to there is larger fluctuation, and makes to safeguard that process becomes difficulty; Oil base drilling fluid is changed completely, but does not detect, this causes a large amount of oil base drilling fluids to waste.
Based on above-mentioned situation, need badly a kind of can quickly and accurately to the method that the conversion degree of oil base drilling fluid detects.
Summary of the invention
For solving the problem, the invention provides a kind of oil base drilling fluid conversion degree detection method, comprising the following steps:
Parameter preparation value determining step, according to the oil base drilling fluid of preparation, measures default oil base drilling fluid parameter, obtains the preparation value of described default oil base drilling fluid parameter;
Parameter detecting value determining step, if described preparation value is greater than the first parameter preset threshold value, then described oil base drilling fluid is injected drilling fluid circulating system, in injection process, every the first preset duration, the default oil base drilling fluid parameter of the returning fluid of described drilling fluid circulating system is detected, obtains the detected value of described default oil base drilling fluid parameter;
Conversion degree determining step, compares described detected value and the second parameter preset threshold value, according to the conversion degree of comparative result determination oil base drilling fluid.
According to one embodiment of present invention, described default oil base drilling fluid parameter comprises emulsion-breaking voltage.
According to one embodiment of present invention, in described parameter monitoring step,
Before described oil base drilling fluid is injected described drilling fluid circulating system, in described drilling fluid circulating system, inject the spacer pad of preset vol.
According to one embodiment of present invention, described spacer pad comprises the base oil of clear water or oil base drilling fluid.
According to one embodiment of present invention, in described parameter detection steps,
When the difference of described detected value and its initial value is greater than preset difference value, every the second preset duration, the default oil base drilling fluid parameter of described returning fluid is detected, obtain the detected value of described default oil base drilling fluid parameter.
According to one embodiment of present invention, described second preset duration is less than described first preset duration.
According to one embodiment of present invention, the span of described first preset duration comprises [15s, 2min].
According to one embodiment of present invention, in described conversion degree determining step,
When described detected value is greater than described second parameter preset threshold value, judge that described drilling fluid circulating system completes the conversion of oil base drilling fluid, otherwise judge that described drilling fluid circulating system does not complete the conversion of oil base drilling fluid.
According to one embodiment of present invention, the span of described second parameter preset threshold value comprises [300V, 400V].
According to one embodiment of present invention, described first parameter preset threshold value is greater than described second parameter preset threshold value.
Oil base drilling fluid conversion degree detection method provided by the present invention can more science, determine whether drilling fluid circulating system completes the conversion of oil base drilling fluid exactly, be also more convenient to the operation of field personnel.Meanwhile, this method does not need to increase at current oil base drilling fluid technical service scene the conversion terminal that extra equipment can judge oil base drilling fluid rapidly, has good reliability and practicality.
In addition, the present invention also passes through to improve when oil base drilling fluid transition interface being detected to detect frequency, makes determined oil base drilling fluid change terminal closer to actual value, also just more timely, accurate when carrying out oil base drilling fluid conversion degree like this.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from instructions, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in instructions, claims and accompanying drawing and obtain.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, do simple introduction by accompanying drawing required in embodiment or description of the prior art below:
Fig. 1 is the process flow diagram of oil base drilling fluid conversion degree detection method according to an embodiment of the invention;
Fig. 2 is the process flow diagram of oil base drilling fluid conversion degree detection method according to another embodiment of the invention.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, to the present invention, how application technology means solve technical matters whereby, and the implementation procedure reaching technique effect can fully understand and implement according to this.It should be noted that, only otherwise form conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
In addition, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
embodiment one:
The defect whether oil base drilling fluid converts accurately cannot be judged for observation or discharge capacity account method, present embodiments provide a kind of method detected based on the conversion degree of emulsion-breaking voltage to oil base drilling fluid of oil base drilling fluid, Fig. 1 shows the process flow diagram of the method.
The present embodiment is that the water-base drilling fluid of Sichuan Basin X1 well is converted to diesel oil based drilling fluid, and wherein the wellbore volume of X1 well is 140m
3, the total volume of the ground circulation system is 320m
3.
As shown in Figure 1, the present embodiment, first in parameter preparation value determining step S101, measures the parameter preset of the oil base drilling fluid of preparation, obtains the preparation value of default oil base drilling fluid parameter.
In the present embodiment, the volume of the oil base drilling fluid of preparation is 220m
3.According to GB/T16782 " oil base drilling fluid On-Site Test Procedure ", the fundamental performance parameter of oil base drilling fluid of preparation is measured, especially need the emulsion-breaking voltage measuring oil base drilling fluid, and using the parameter value that the records preparation value as oil base drilling fluid parameter.Wherein, the measured value of each oil base drilling fluid parameter is as follows: density is 1.25g/cm
3; Electric leakage viscosity is 65s; Plastic viscosity is 22mPas; Yield value is 8Pa; API filtration is 0.2mL; Emulsion-breaking voltage is 723V.
In order to ensure that the oil base drilling fluid prepared can normally use, the measured value judging oil base drilling fluid in the present embodiment, is needed whether to be greater than the first parameter preset threshold value.Because the present invention is the conversion degree judging oil base drilling fluid based on emulsion-breaking voltage, so judge whether the preparation value of emulsion-breaking voltage is greater than first and presets emulsion-breaking voltage threshold value herein.Wherein, by comprehensively analyzing actual production data, preset emulsion-breaking voltage threshold by first in the present embodiment and be taken as 400V, but the present invention is not limited thereto, in other embodiments of the invention, this first preset emulsion-breaking voltage threshold value can also get other reasonable values, such as first preset emulsion-breaking voltage threshold value can also in [300V, 400V] scope value.The preparation value of the emulsion-breaking voltage of the oil base drilling fluid that the present embodiment uses is 723V, and the first default emulsion-breaking voltage threshold value is 400V, this shows that this oil base drilling fluid can meet request for utilization.
As shown in Figure 1, after determining that oil base drilling fluid can normally use, in order to ensure being effectively separated of water-base drilling fluid and oil base drilling fluid, the present embodiment pumps into the spacer pad of preset vol in step s 102 in the drilling fluid circulating system of X1 well.Wherein, the spacer pad that the present embodiment uses is diesel oil, but the present invention is not limited thereto, and in other embodiments of the invention, spacer pad can also adopt other reasonable materials, and such as clear water or funnel viscosity are higher than the heavy oil base drilling fluid etc. of 80s.
When pumping into spacer pad in drilling fluid circulating system, first polish drill rod is dropped to the 2250m place, shaft bottom of X1 well, and guarantee that drilling fluid circulating system is not stung and do not leak, namely ensure that drilling fluid circulating system can normally be run.Meanwhile, gate valve is returned out in the outlet of adjustment drilling fluid circulating system, to ensure that the water-base drilling fluid returned out flows directly into useless stock tank, instead of enters the oil base drilling fluid circulation system.
Open steam piano subsequently, keep mud pump capacity to be 45L/s, pump into 3m by steam piano to drilling fluid circulating system
3spacer pad.It should be noted that, in other embodiments of the invention, mud pump capacity can also be other reasonable values, such as, value within the scope of 10 ~ 50L/s, and the volume of the spacer pad pumped into also can be other reasonable values, such as 0 ~ 3m
3value in scope, the present invention is not limited thereto.Simultaneously, spacer pad is pumped into pumping in oil base drilling fluid forward direction drilling fluid circulating system in the present embodiment, can effectively be separated with oil base drilling fluid in order to ensure water-base drilling fluid, in other embodiments of the invention, according to practical condition, can not also spacer pad be pumped into, the present invention is not limited thereto.
After spacer pad pumps into, the present embodiment pumps into oil base drilling fluid with the discharge capacity of 45L/s in step s 103 in drilling fluid circulating system, and adopt FAN23D type electrical stability tester to detect every the emulsion-breaking voltage of the first preset duration to returning fluid in the exit of drilling fluid circulating system, thus obtain the detected value of emulsion-breaking voltage.Certainly, in other embodiments of the invention, the emulsion-breaking voltage of other rational testers to returning fluid can also be adopted to detect, the present invention is not limited thereto.In the present embodiment, the first preset duration is 30s, but the present invention is not limited thereto, and in other embodiments in accordance with the invention, the first preset duration also adopts other reasonable values according to actual needs, such as, value within the scope of 15s ~ 2min.
Table 1 shows the measured value that each moment in the present embodiment detects the emulsion-breaking voltage obtained.
Table 1
When pumping into oil base drilling fluid in drilling fluid circulating system, in step S104, constantly the detected value of the emulsion-breaking voltage obtained and second being preset emulsion-breaking voltage threshold value compare.If the detected value of emulsion-breaking voltage is greater than the second predetermined voltage threshold, then in step S105, judge converting of oil base drilling fluid; Otherwise judge that the conversion of oil base drilling fluid does not also complete, and return step S103 continue in drilling fluid circulating system, pump into oil base drilling fluid.In the present embodiment, the second default emulsion-breaking voltage threshold value is 400V, but the present invention is not limited thereto, and in other embodiments of the invention, according to the difference of used oil base drilling fluid, the second default emulsion-breaking voltage threshold value can also be other reasonable values.
Can find out according to the data shown in table 1, the initial value of the emulsion-breaking voltage detected value obtained in the present embodiment is about 6V.When 47min, not there is significant change in emulsion-breaking voltage detected value, and this illustrates that now drilling fluid circulating system exports the drilling fluid returned out and is still the water-base drilling fluid originally contained in drilling fluid circulating system.And the emulsion-breaking voltage detected value obtained when 48min significantly rises to 276V, this illustrates that the drilling fluid now returned out is the mixed slurry part of water-base drilling fluid and oil base drilling fluid.The emulsion-breaking voltage detected value obtained when 48.5min is 387V, and the emulsion-breaking voltage detected value obtained when 49min is 496V.Water-base drilling fluid is replaced out drilling fluid circulating system to oil base drilling fluid during 49min by this explanation completely, and be now the conversion terminal of oil base drilling fluid, drilling fluid circulating system has completed the conversion of oil base drilling fluid completely.
After determining that oil base drilling fluid converts, the wellhead sluice valve of adjustment drilling fluid circulating system, guarantees that the oil base drilling fluid that well head returns out can enter the circulation system smoothly.Also adjust the performance of oil base drilling fluid simultaneously, and start wellbore construction after performance meets the requirements.
Compared to existing ocular estimate and discharge capacity measurement Law, the oil base drilling fluid conversion degree detection method that the present embodiment provides can more science, determine whether drilling fluid circulating system completes the conversion of oil base drilling fluid exactly, be also more convenient to the operation of field personnel.Meanwhile, this method does not need to increase at current oil base drilling fluid technical service scene the conversion terminal that extra equipment can judge oil base drilling fluid rapidly, has good reliability and practicality.
embodiment two:
In the present embodiment, utilize method provided by the present invention that the water-base drilling fluid of the X2 well in Tarim Basin is converted to mineral oil based drilling fluid, with this, object of the present invention, principle and advantage are set forth further.
In Tarim Basin, the pit shaft capacity of X2 well is 220m
3, the total volume of the ground circulation system is 200m
3.Because ground circulation system total volume is less than the pit shaft capacity of X2 well, therefore cannot once realize pumping into of oil base drilling fluid, but need at twice oil base drilling fluid to be pumped in drilling fluid circulating system, can conversion have been completed like this.
Fig. 2 shows the process flow diagram of the oil base drilling fluid conversion degree detection method that the present embodiment provides.
As shown in Figure 2, the present embodiment prepares 160m in the circulation system of ground first in step s 201 at the scene
3oil base drilling fluid, measure the parameter of the oil base drilling fluid prepared after having prepared according to GB/T16782 " oil base drilling fluid On-Site Test Procedure ".The parameter of the oil base drilling fluid that the present embodiment obtains is as follows:
Density is 1.50g/cm
3; Funnel viscosity is 72s; Plastic viscosity is 24mPas; Yield value is 10Pa; API filtration is 0.0mL; Emulsion-breaking voltage is 938V.
In order to ensure prepare oil base drilling fluid can normally use, judge in the present embodiment whether the measured value of oil base drilling fluid is greater than the first parameter preset threshold value, its principle and process identical with process with the principle set forth in embodiment one, do not repeat them here.
When pumping into spacer pad in drilling fluid circulating system, first polish drill rod is dropped to the 4250m place, shaft bottom of X2 well, and guarantee to bore the circulation system at night not sting not leak, namely ensure that drilling fluid circulating system can normally be run.Meanwhile, gate valve is returned out in the outlet of adjustment drilling fluid circulating system, to ensure that the water-base drilling fluid returned out flows directly into useless stock tank, instead of enters the oil base drilling fluid circulation system.
Steam piano is opened subsequently in step S202, and keep mud pump capacity to be 45L/s, oil base drilling fluid is pumped into drilling fluid circulating system by steam piano, and pumping into the emulsion-breaking voltage detecting drilling well circulation system returning fluid in process every the first preset duration, thus obtain the detected value of emulsion-breaking voltage.Table 2 shows the emulsion-breaking voltage detected value do not obtained in the same time.In the present embodiment, the first preset duration is 2min, but the present invention is not limited thereto, and in other embodiments of the invention, the first preset duration can also get other reasonable values, such as, value within the scope of 15s ~ 2min.
Table 2
As can be seen from Table 2, by 160m
3the process that pumps in drilling fluid circulating system of oil base drilling fluid in, the emulsion-breaking voltage detected value obtained does not occur significantly to rise, and this drilling fluid illustrating that in this process, drilling fluid circulating system is returned out is the water-base drilling fluid be stored in pit shaft.
By the 160m that ground is prepared
3oil base drilling fluid all pump into after in drilling fluid circulating system, termination of pumping.
Because the oil base drilling fluid in the circulation system of ground has all been pumped in drilling fluid circulating system, so the ground circulation system is empty.Now in the ground circulation system of having soared, prepare 120m again
3oil base drilling fluid, and measure the parameter of the oil base drilling fluid now prepared according to GB/T16782 " oil base drilling fluid On-Site Test Procedure ".In the present embodiment, the parameter of the oil base drilling fluid now prepared is as follows: density is 1.50g/cm
3; Funnel viscosity is 71s; Plastic viscosity is 25mPas; Yield value is 10.5Pa; API filtration is 0.2mL; Emulsion-breaking voltage is 992V.
In order to ensure that the oil base drilling fluid prepared can normally use, now judge whether the measured value of oil base drilling fluid is greater than the first parameter preset threshold value.Its principle and process identical with process with the principle set forth in embodiment one, do not repeat them here.
After preparing new oil base drilling fluid, reopen steam piano, and with the discharge capacity of 15L/s, new oil base drilling fluid is pumped in drilling fluid circulating system.In the process pumped into, adopt electric steady testing instrument to detect the emulsion-breaking voltage of the returning fluid of gate valve place of drilling fluid circulating system outlet every the first preset duration, obtain the measured value of emulsion-breaking voltage.
More accurate in order to ensure the conversion terminal of the oil base drilling fluid obtained, in step S203, calculate the difference of the detected value of emulsion-breaking voltage and the initial value of emulsion-breaking voltage detected value in the present embodiment, and compare this difference and whether be greater than preset difference value.If the difference of the initial value of the detected value of emulsion-breaking voltage and detected value is greater than preset difference value, then show that the emulsion-breaking voltage of the drill-in fluid that drilling fluid circulating system is returned out obviously rises, this also just shows now to reach the transition interface of oil base drilling fluid, and (drilling fluid that namely drilling fluid circulating system is returned out is the mixed slurry part of water-base drilling fluid and oil base drilling fluid.In the present embodiment, preset difference value is 10V, but the present invention is not limited thereto, and in other embodiments of the invention, this preset difference value can also be other reasonable values, such as, value etc. in [12V, 20V] scope.
When after the transition interface reaching oil base drilling fluid, the present embodiment, in step S204, detects the emulsion-breaking voltage of drilling fluid circulating system returning fluid every the second preset duration.Wherein, the second preset duration is 30s.Certainly, in other embodiments of the invention, the second preset duration can be also other reasonable values, the present invention is not limited thereto.Detecting frequency by improving, so just more adequately can determine the destination node of mailing drilling fluid conversion, thus making the testing result of oil base drilling fluid conversion degree in the present embodiment more accurate, improve reliability of the present invention.
Table 3 shows the measured value of the emulsion-breaking voltage do not obtained in the same time.
Table 3
Can find out according to the data shown in table 3, the initial value of the emulsion-breaking voltage detected value obtained in the present embodiment is about 6V.In the duration of 1min ~ 17min, the detected value of the emulsion-breaking voltage obtained and the difference of initial value are about 1V.And when 19min, the emulsion-breaking voltage detected value obtained significantly has risen to 134V, the difference of itself and initial value has been 128V, is obviously greater than 10V.So detect the emulsion-breaking voltage of a drilling fluid circulating system returning fluid subsequently every 30s.When 21.5min, the emulsion-breaking voltage detected value obtained reaches 438V.
As shown in Figure 2, in step S205, judge in the present embodiment whether the detected value of emulsion-breaking voltage is greater than second and presets emulsion-breaking voltage threshold value.Wherein, the second emulsion-breaking voltage threshold value is 400V, but the present invention is not limited thereto.If the emulsion-breaking voltage detected value that certain moment obtains is greater than 400V, then show completely water-base drilling fluid to be replaced out drilling fluid circulating system at this moment oil base drilling fluid, this moment is the conversion terminal of oil base drilling fluid, converting of oil base drilling fluid.
As can be seen from Table 3, the emulsion-breaking voltage that the present embodiment obtains when 21.5min is greater than 400V, so drilling fluid circulating system completes the conversion of oil base drilling fluid in the present embodiment when 21.5min.
After determining that oil base drilling fluid converts, the wellhead sluice valve of adjustment drilling fluid circulating system, guarantees that the oil base drilling fluid that well head returns out can enter the circulation system smoothly.Also adjust the performance of oil base drilling fluid simultaneously, and start wellbore construction after performance meets the requirements.
As can be seen from foregoing description, the present embodiment is on the basis of the method provided based on embodiment one, detect frequency by improving when oil base drilling fluid transition interface being detected, thus the method that the present embodiment is provided determined oil base drilling fluid conversion terminal is closer to actual value.So the method that the present embodiment provides is also just more timely, accurate when carrying out oil base drilling fluid conversion degree.
Although the embodiment disclosed by the present invention is as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from the spirit and scope disclosed by the present invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (10)
1. an oil base drilling fluid conversion degree detection method, is characterized in that, comprises the following steps:
Parameter preparation value determining step, according to the oil base drilling fluid of preparation, measures default oil base drilling fluid parameter, obtains the preparation value of described default oil base drilling fluid parameter;
Parameter detecting value determining step, if described preparation value is greater than the first parameter preset threshold value, then described oil base drilling fluid is injected drilling fluid circulating system, in injection process, every the first preset duration, the default oil base drilling fluid parameter of the returning fluid of described drilling fluid circulating system is detected, obtains the detected value of described default oil base drilling fluid parameter;
Conversion degree determining step, compares described detected value and the second parameter preset threshold value, according to the conversion degree of comparative result determination oil base drilling fluid.
2. the method for claim 1, is characterized in that, described default oil base drilling fluid parameter comprises emulsion-breaking voltage.
3. method as claimed in claim 1 or 2, is characterized in that, in described parameter monitoring step,
Before described oil base drilling fluid is injected described drilling fluid circulating system, in described drilling fluid circulating system, inject the spacer pad of preset vol.
4. method as claimed in claim 3, it is characterized in that, described spacer pad comprises the base oil of clear water, diesel oil or oil base drilling fluid.
5. the method according to any one of Claims 1 to 4, is characterized in that, in described parameter detection steps,
When the difference of described detected value and its initial value is greater than preset difference value, every the second preset duration, the default oil base drilling fluid parameter of described returning fluid is detected, obtain the detected value of described default oil base drilling fluid parameter.
6. method as claimed in claim 5, it is characterized in that, described second preset duration is less than described first preset duration.
7. the method according to any one of claim 1 ~ 6, is characterized in that, the span of described first preset duration comprises [15s, 2min].
8. the method according to any one of claim 1 ~ 7, is characterized in that, in described conversion degree determining step,
When described detected value is greater than described second parameter preset threshold value, judge that described drilling fluid circulating system completes the conversion of oil base drilling fluid, otherwise judge that described drilling fluid circulating system does not complete the conversion of oil base drilling fluid.
9. the method according to any one of claim 1 ~ 8, is characterized in that, the span of described second parameter preset threshold value comprises [300V, 400V].
10. the method according to any one of claim 1 ~ 9, is characterized in that, described first parameter preset threshold value is greater than described second parameter preset threshold value.
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| CN116383624A (en) * | 2022-12-15 | 2023-07-04 | 中国石油大学(北京) | Demulsification voltage accurate correction method, processor, device and storage medium |
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