CN1970990B - Method for measuring return flow in petroleum drilling and device therefor - Google Patents
Method for measuring return flow in petroleum drilling and device therefor Download PDFInfo
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- CN1970990B CN1970990B CN200610145028XA CN200610145028A CN1970990B CN 1970990 B CN1970990 B CN 1970990B CN 200610145028X A CN200610145028X A CN 200610145028XA CN 200610145028 A CN200610145028 A CN 200610145028A CN 1970990 B CN1970990 B CN 1970990B
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Abstract
The invention relates to a division measurement device with small section, comprising dividing cell, transferring cell for flux signal, signal-modulated and A/D conversion cell, and computer collection and processing cell. The flux in dividing pipe is converted to electrical signal by electromagnetic flowmeter and is connected with signal-modulated and A/D conversion cell. The signal-modulated and A/D conversion cell mainly comprises filtering, amplification and A/D conversion. Digital signal obtained is connected with computer collection and processing cell by anti-interference signal wire and by software the actual flux of dividing pipe is calculated so as to infer the returning flux of oil well. Non-contact Doppler measuring device comprises conversion cell group of flux signal, signal-modulated and A/D conversion cell, and computer collection and processing cell. As the empty flux of well ring at the position with different directions and layers is measured by conversion cell group of flux signal the returning flux of well with higher accuracy is obtained. The equipment measures the returning flux of well fluid in time and is provided with high measuring accuracy and little signal error.
Description
Technical field:
The present invention relates to a kind of oil drilling and return outflow measuring method and device, belong to the oil and gas well drilling technical field of measurement and test.
Background technology:
In the Process of Oil Well Drilling, it is one of important parameters in oil and the geological drilling work that outflow is returned in outlet, how to accurately measure mouthful flow and become the problem of always exploring in the oil drilling, in fact with regard to drilling well, measure basic goal that outlet returns outflow and be and determine whether rate of discharge changes and change size on normal basis, judged whether that abnormal conditions such as overflow take place, thereby taken measures early, avoid the generation of accident, reduce life and property loss.
Several schemes appearred in the measurement for rate of discharge for many years, the mud that returns out from annular space wherein occurred early, service time is the longest is the baffle-type flow meter, by aerial pipeline, mud ditch, flow to vibrosieve, enter mud pit, baffle flowmeter is contained on the aerial pipeline, when mud flow, impact baffle plate, baffle plate move upward with the mud liquid level under the mud effect, rotate thereby drive the potentiometer shaft that links to each other with connection shaft, cause that the output resistance of potentiometer also changes thereupon.Obviously, this method is to determine the baffle plate lifting height by detection resistance value (or magnitude of voltage), thereby determines the situation of change of flow.This flowmeter structure is simple, and is convenient durable.Shortcoming is: the present outflow that returns is measured all returning out on the pipeline and is measured, and the mobile cross section of drilling fluid is very big on this pipeline, make Measurement Resolution very low, this outer baffle is often clung by mud, the lifting height of baffle plate is changed, cause certainty of measurement to reduce, and need frequent clean and maintenance.As calculated, when returning outflow when 24L/s is increased to 25L/s, consider the very big and adhesion of mud on baffle plate of liquid level area, the rising amplitude has only about 2%, most of baffle-type flow meter does not reach this precision, makes that this measuring method of baffle-type flow meter is infeasible.
Another is indirect measuring method, by measuring the mud pit level high variable quantity, the anti-situation of change of releasing rate of discharge, what this method was used is float level meter, but because the mud pit sectional area is too big, makes the variation of mud pit level can not in time reflect the variation of rate of discharge, lag time is oversize, error is big, and precision is low, has influenced the meaning of measuring to a great extent.As calculated, be in the mud pit of 5m, suppose to return outflow and be increased to 25L/s from 24L/s length and width, the mud pit level 144mm that only raises after hour, this precision does not satisfy on-the-spot needs at all.
The other flow meter, though higher as certainties of measurement such as electromagnetic flowmeter, turbine flowmeter, ultrasonic flowmeters, also all because outlet mud full packages and to return out the size of pipeline irregular and influenced certainty of measurement greatly not.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of drilling process to detect the method and apparatus that returns outflow in real time, solve in the drilling engineering and return the big difficult problem of outflow measure error.
Use low-cost apparatus accurately to detect in real time and return outflow,, provide technical support for creeping into fast for the safety well control gains time.
Operating principle of the present invention:
The main starting point of this method is to measure on small bore, can reflect changes in flow rate very sensitively.Oil drilling returns outflow measuring method and device, one of method is measured for the shunting small bore, its key is to install the branched pipe of a minor diameter parallel with returning out pipeline below the mud return line line, adopt electromagnetic flowmeter, turbine flowmeter etc. to measure flow, realizes the small bore measurement.According to branched pipe flow that records and the corresponding relation that returns outflow, can calculate drilling well and return outflow; Method two for the well head anti-overflow pipe is carried out the flow measurement of noncontact small bore annular space, its key can adopt Doppler to wait on the well head anti-overflow pipe and measure flow, realizes that small bore measures.
The objective of the invention is to realize by the following technical solutions:
Be easy to install under the operating mode of branched pipe, using shunting small bore measurement mechanism.At this moment, at the following 30cm of mud return line line place a branched pipe parallel with returning out pipeline is installed, selecting 30cm is that the installation of considering branched pipe will make things convenient for and safety, if branched pipe is too far away from the mud return line line, unfavorable to keeping the safety in production.
Branched pipe is divided into two by high sensitivity flowmeter, first section branched pipe length is 1m, selecting its length is 1m, be to consider that just to have entered branched pipe length be 20cm has formed a negative-pressure adsorption district with interior at fluid, at the similar whirlpool of this regional fluid, instability of flow has only after branched pipe length surpasses certain numerical value, just can have than stable flow rate, flow transmitter must be installed in beyond the 20cm when therefore surveying the branched pipe flow.Studies show that at branched pipe diameter one regularly, when branched pipe length was 1m, the branched pipe flow was big and stable, so branched pipe length is decided to be 1m.The diameter of first section branched pipe depends on the circumstances, and this is that along with the branched pipe diameter becomes big, it is big that the branched pipe flow becomes, so under the situation that situation allows at the scene, should strengthen the branched pipe diameter as much as possible because when one timing of branched pipe length.
Second section branched pipe pipeline wanted overstriking, and the resistance of can reducing friction like this guarantees to have bigger flow, improves certainty of measurement.
Between two sections branched pipes, install high precision flow additional, form signal gathering unit, link to each other with the signal condition unit, be used to gather flow signals in the branched pipe by anti-tampering holding wire.
Signal after the conditioning carries out the A/D conversion, and analog signal conversion is become data signal, offers computer data acquiring and processing unit by data wire.
Utilize process software to set up stream baric flow amount transformation model, the drilling fluid branched pipe stream that utilizes this model to read to record press data signal will, and calculate drilling fluid annular space flow based on this.
Through software simulation and field experiment, the pass that can obtain between branched pipe changes in flow rate Q1 and the annular space changes in flow rate Q2 is a linear dependence:
Q2＝0.818Q1-0.8256
By test to Zhongyuan Oil Field 4 cause for gossip border producing wells and 1 mouthful of experiment well, show that the present invention can apply to actual production, guidance is crept into.
For the operating mode that is not easy to install branched pipe, can use contactless doppler measuring apparatus.4 groups of Doppler flowmeters are loaded onto in the different layers position on sleeve outer wall.Between every group of Doppler flowmeter between the upper and lower apart from be 20cm, the general angle of reining between flow meter emitter and the receiving system is 90 °, for the comprehensive property that guarantees to measure, carries out according to the equally distributed principle of horizontal projection during the installation Doppler flowmeter.
Each is organized the Doppler flowmeter signal and enters the conditioning unit by anti-tampering holding wire, is used for gathering respectively organizing the inventionannulus flow signal.
Signal after the conditioning carries out the A/D conversion, and analog signal conversion is become data signal, offers computer data acquiring and processing unit by data wire.
Set up flow conversion and transaction module, utilize this model to read and to optimize and respectively organize signal, and 4 groups of signals are averaged be drilling fluid annular space flow.
The present invention compares with background technology, has the following advantages:
1, can monitor drilling well annular space changes in flow rate in real time, the measuring accuracy height, data error is little.
2, when the overflow well kick accident that run into because gas cut etc. caused, can in time monitor changes in flow rate, for the safety well control gains time.
3, contactless doppler measuring apparatus is easy for installation, does not need to punch on casing wall.
Description of drawings:
Fig. 1 is a principle schematic of the present invention.
Fig. 2 is a shunting small bore measurement mechanism scheme of installation.
Fig. 3 is the on-the-spot scheme of installation of contactless doppler measuring apparatus.
The specific embodiment:
As shown in Figure 1, 2, 3, shunting small bore measurement mechanism is provided with dividing cell 1, flow signal converting unit 2, signal condition and A/D converting unit 4, computer acquisition and processing unit 3.Wherein, dividing cell 1 is made up of the different branched pipe 8 of diameter, is divided into two by flow signal converting unit 2, and flow signal converting unit 2 is made up of high sensitivity flowmeter 7.Link to each other by anti-tampering holding wire between flow signal converting unit 2 and signal condition and the A/D converting unit 4, link to each other by data wire between signal condition and A/D converting unit 4 and computer acquisition and the processing unit 3.
At mud return line line 6 following 30cm places a branched pipe parallel with returning out pipeline 8 is installed, selecting 30cm is that the installation of considering branched pipe will make things convenient for and safety, if branched pipe is too far away from the mud return line line, unfavorable to keeping the safety in production.
Branched pipe 8 is divided into two by high sensitivity flowmeter 7, first section branched pipe length is 1m, selecting its length is 1m, be to consider that just to have entered branched pipe length be 20cm has formed a negative-pressure adsorption district with interior at fluid, at the similar whirlpool of this regional fluid, instability of flow has only after branched pipe length surpasses certain numerical value, just can have than stable flow rate, flow transmitter must be installed in beyond the 20cm when therefore surveying the branched pipe flow.Studies show that at branched pipe diameter one regularly, when branched pipe length was 1m, the branched pipe flow was big and stable, so branched pipe length is decided to be 1m.The diameter of first section branched pipe depends on the circumstances, and this is that along with the branched pipe diameter becomes big, it is big that the branched pipe flow becomes, so under the situation that situation allows at the scene, should strengthen the branched pipe diameter as much as possible because when one timing of branched pipe length.
Second section branched pipe pipeline wanted overstriking, and the resistance of can reducing friction like this guarantees to have bigger flow, improves certainty of measurement.
Between two sections branched pipes, install high sensitivity flowmeter 7 additional, form the flow signal converting unit, link to each other with signal condition unit 4 by anti-tampering holding wire, be used to gather the branched pipe flow signals of drilling fluid, and being converted to the 4-20mA current signal, the anti-tampering holding wire of being mentioned can guarantee that the signal that collects avoids being subjected to external interference.
Signal condition and A/D converting unit 4 mainly comprise filtering, amplification, A/D translation function, can amplify signal with filtering and handle, and analog signal conversion is become data signal, offer computer data acquiring and processing unit 3 by data wire.
Utilize process software to set up flow conversion and transaction module, utilize this model to read and optimize the branched pipe flow signal that records, and calculate drilling fluid annular space flow based on this.
Contactless doppler measuring apparatus needs the Doppler flowmeter that uses many groups to be made up of emitter 10 and receiving system 11.On marine riser 9 outer walls, load onto 4 groups of Doppler flowmeters.Between every group of Doppler flowmeter between the upper and lower apart from being 20cm, each distance of organizing between Doppler flowmeter emitter 10 and the receiving system 11 is chosen as 90 °, for the comprehensive property that guarantees to measure, when being installed, Doppler flowmeter carries out according to the equally distributed principle of horizontal projection.
Each is organized Doppler flowmeter and links to each other with the signal condition unit by anti-tampering holding wire, is used for collection and respectively organizes the inventionannulus flow signal.
Signal after the conditioning carries out the A/D conversion, and analog signal conversion is become data signal, offers computer data acquiring and processing unit by data wire.
Set up flow conversion and transaction module, utilize this model to read and to optimize and respectively organize signal, and 4 groups of signals are averaged be drilling fluid annular space flow.
Claims (6)
1. an oil drilling returns the outflow measurement mechanism, it is characterized in that: comprise dividing cell, flow signal converting unit, signal condition and A/D converting unit, computer acquisition and processing unit, described dividing cell is returned out pipeline below and the branched pipe parallel with returning out pipeline formed by being connected to be positioned on the sleeve pipe, branched pipe is divided into two parts by the flow signal converting unit, the diameter of the part that links to each other with sleeve pipe is less than the diameter of part after the flow signal converting unit, branched pipe flow Q
1With return outflow Q
2The pass be: Q
2=0.818Q
1-0.8256.
2. oil drilling according to claim 1 returns the outflow measurement mechanism, it is characterized in that: described branched pipe is positioned at and returns out the following 30cm of pipeline place.
3. oil drilling according to claim 1 returns the outflow measurement mechanism, it is characterized in that: described flow signal converting unit is the high sensitive electromagnetic flow meter, and the branched pipe flow signal of drilling fluid is converted into the signal of telecommunication in real time.
4. oil drilling according to claim 3 returns the outflow measurement mechanism, it is characterized in that: described high sensitive electromagnetic flow meter is installed on the 20cm branched pipe in addition.
5. oil drilling according to claim 1 returns the outflow measurement mechanism, it is characterized in that: described signal condition and A/D converting unit and computer acquisition and processing unit can amplify signal with filtering to be handled, and analog signal conversion become data signal, offer computer.
6. oil drilling according to claim 3 returns the outflow measurement mechanism, it is characterized in that: described high sensitive electromagnetic flow meter links to each other with the A/D converting unit with signal condition by anti-tampering holding wire, eliminates and disturbs.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610145028XA CN1970990B (en) | 2006-11-29 | 2006-11-29 | Method for measuring return flow in petroleum drilling and device therefor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610145028XA CN1970990B (en) | 2006-11-29 | 2006-11-29 | Method for measuring return flow in petroleum drilling and device therefor |
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| CN1970990A CN1970990A (en) | 2007-05-30 |
| CN1970990B true CN1970990B (en) | 2011-06-08 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270658B (en) * | 2008-04-30 | 2012-07-04 | 濮阳精钻石油工程技术有限公司 | Correlated flux injection section test method and construction technique |
| CN102444399A (en) * | 2010-10-11 | 2012-05-09 | 李相方 | High resolution drilling fluid returning flow meter |
| CN102174887B (en) * | 2011-01-05 | 2014-03-12 | 中国海洋石油总公司 | Device for measuring annulus flow between sea bottom marine riser and drill column by using ultrasonic waves |
| CN102102511B (en) * | 2011-01-10 | 2013-11-27 | 中国海洋石油总公司 | Underground ultrasonic Doppler flow measurement device and measurement method |
| CN102121357A (en) * | 2011-01-13 | 2011-07-13 | 东北石油大学 | Drilling fluid return flow measuring method and measuring device thereof |
| CN106401513B (en) * | 2016-12-09 | 2017-06-16 | 中国石油大学(华东) | Improve the well head bell nipple of drilling fluid return flow measurement sensitivity |
| CN107060737B (en) * | 2017-05-26 | 2020-09-08 | 中国石油天然气集团公司 | While-drilling gas invasion simulation experiment device and experiment method |
| CN107816345A (en) * | 2017-10-09 | 2018-03-20 | 中国石油天然气集团公司 | A kind of apparatus and method of well casing gas tolerance metering |
| CN111364979B (en) * | 2020-03-23 | 2023-05-23 | 中国石油大学(华东) | Underground gas invasion monitoring system based on ultrasonic waves |
| CN112412437B (en) * | 2020-11-18 | 2023-11-17 | 中国石油天然气集团有限公司 | Wellhead return flow measuring method |
| CN115596430A (en) * | 2022-10-17 | 2023-01-13 | 中国石油大学（华东）（Cn） | Underground multistage gas cut monitoring device and gas cut identification method for oil and gas drilling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1203294C (en) * | 2002-08-08 | 2005-05-25 | 武汉长江仪器自动化研究所 | Cement mortar flow metering method for dam foundation rock grouting |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1203294C (en) * | 2002-08-08 | 2005-05-25 | 武汉长江仪器自动化研究所 | Cement mortar flow metering method for dam foundation rock grouting |
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Granted publication date: 20110608 Termination date: 20121129 |