CN102678103A - Method for determining size of groove of drill collar of while drilling electromagnetic wave electrical resistivity instrument - Google Patents
Method for determining size of groove of drill collar of while drilling electromagnetic wave electrical resistivity instrument Download PDFInfo
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- CN102678103A CN102678103A CN2012101414626A CN201210141462A CN102678103A CN 102678103 A CN102678103 A CN 102678103A CN 2012101414626 A CN2012101414626 A CN 2012101414626A CN 201210141462 A CN201210141462 A CN 201210141462A CN 102678103 A CN102678103 A CN 102678103A
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Abstract
The invention discloses a method for determining the size of a groove of a drill collar of a while drilling electromagnetic wave electrical resistivity instrument. The method comprises the following steps of: providing an initial groove depth dimension range which is reasonable as much as possible and initial diameters of a transmitting coil and a receiving coil, and calculating the range of induced electromotive force Ux on the receiving coil under the actual condition according to function relationship P; judging whether the range of induced electromotive force Ux is received by a receiver; and adjusting the structure size of the instrument according to the judgment result and finally finding the optimal depth dimension of the groove, and the distance between the inner wall of the groove and an antenna. By the method, the depth dimension index of the groove of the drill collar and the index of the distance between the inner diameter of the groove and the coil are successfully determined for an SMPR-1 logging-while-drilling tool, and a necessary condition is provided for successfully developing the logging-while-drilling tool. The method has significance to the development of the logging-while-drilling tools.
Description
SkillThis area:
The present invention relates in the field of petroleum exploitation with boring the electromagnetic wave logging technology, be specifically related to a kind of with the formulating method that bores electromagnetic resistivity quasi-instrument drill collar groove size.
Background technology:
In recent years, along with the demand of land horizontal well and increase of high angle hole drilling effort and offshore drilling, the normal cable well logging can not have been satisfied the needs of logging technique, so logging while drilling technology has obtained very fast development.It can be realized drilling well and log well and carry out simultaneously; Be that logger is installed in the position near drill bit; Do not receive on the stratum measure under the condition of obvious intrusion and pollution and the traditional cable log facies relatively, have that real-time is good, the logging accuracy advantages of higher.With boring the electromagnetic resistivity logger is one of instrument the most frequently used in the well logging during; It mainly measures the resistivity information on stratum; Because the resistivity of oil reservoir is higher generally speaking; Therefore it can the effective recognition oil reservoir, and also has and can instruct the drill bit geosteering function that level is crept in oil reservoir.It is thus clear that development has very important practical significance with boring the electromagnetic resistivity logger, can strengthen the strength of China in the well logging during field, helps the oil field to find more oil and gas reservoir, alleviates petroleum resources situation in short supply.
China adopts imitated method mostly in this kind of development instrument, seldom grasp core technology, though can accelerate development speed like this, and be unfavorable for improvement and the upgrading from now on of this instrument, also be unfavorable for the real development of China's logging technique.In order to grasp core technology, we are to having carried out deep theoretical research with boring the electromagnetic resistivity logger.Transmitting and receiving in the groove that antenna all is wrapped in drill collar of this instrument; But because drill collar can produce very large decay to signal; And the distance of the existence of groove and coil and groove inwall also can exert an influence to signal; Grasping the core technology that the method for analyzing these factor affecting is this instrument of development, be directly connected to the success or failure of this instrument of development and the service behaviour of this instrument, is the necessary condition of this quasi-instrument of development.
Summary of the invention:
The objective of the invention is through the influence rule of the distance between analysis drill collar groove and groove inwall and coil signal; A kind of rational drill collar groove and coil dimension method made is provided, promptly with the formulating method that bores electromagnetic resistivity quasi-instrument drill collar groove size.
Technical scheme of the present invention: a kind of with the formulating method that bores electromagnetic resistivity quasi-instrument drill collar groove size, it is characterized in that may further comprise the steps:
Step 1:, confirm the minimum diameter index R of this instrument according to the suffered extraneous stress of instrument working environment;
Step 2: the minimum diameter index R with this instrument is a foundation, a given first initial as far as possible reasonably depth of groove size range H
0(step 2 and step 3 order are interchangeable)
Step 3: and the initial diameter R of given first transmitting coil and receiving coil
0And R
0 receives, each coil scope is greater than the groove inwall and less than the drill collar outer wall;
Step 4: under the size condition in step 2 and step 3, suppose that the electric current on the transmitting coil is I, calculate this instrument induced electromotive force scope U on the receiving coil in common stratum scope; The size of this value U and the emission current I on the transmitting coil are functional relation P;
Step 5: the signal magnitude that transmitting coil sends is limited by the power index of emitter, calculates the electric current I of transmitting coil emission according to the size of transmitter power in the reality
xSize, again according to functional relation P in the step 4, calculate the induced electromotive force U on the receiving coil under the actual conditions
xScope;
Step 6: the induced electromotive force signal that receiving coil receives is gathered by receiver, and receiver has sensitivity and the dynamic range index that receives signal, according to the induced electromotive force U on the receiving coil that calculates in these index determining steps 5
xScope whether can be received machine and receive;
Step 7: the judged result according to step 6 is adjusted the apparatus structure size; Change the size of receiving coil signal with this; It is received to guarantee when instrument is in the stratum that needs are measured that the signal of receiving coil can be received machine; Finally find the wide dark size of optimum groove and the distance of groove inwall and antenna, method of adjustment is:
1) diameter of change transmitting coil and receiving coil;
2) diameter of change groove inwall, but groove diameter is greater than the minimum diameter index R that step 1 is made, and can not surpass the diameter of coil;
3) length of change groove.
Method of adjustment by 7; The factors such as index, transmitter power index, receiver sensitivity and dynamic range index, drill collar minimum diameter index and coil protect material thickness index of the measurement stratum electrical parameter range of instrument be need consider simultaneously, rational groove size and groove inwall and coil-span size made.
Beneficial effect: 1, this inventive method is that development is with the key technology of boring electromagnetic resistivity class logger; Successfully formulated dark wide index and the groove internal diameter and the coil-span size index of drill collar groove, necessary condition is provided for successfully developing this instrument for the SMPR-1 logging while drilling apparatus.
2, this inventive method can provide an indication range for the transmitter and receiver of this instrument; With the dynamic range of signals maximization that guarantees to receive; On the basis of current circuit engineering, obtain maximum measurement category of instrument and best certainty of measurement; Make this instrument in formation evaluation, have the wideer scope of application and bigger using value, and and then help Oilfield Company to verify more reserves, alleviating energy crisis to a certain extent.
3, this inventive method all has reference function to all with the instrument that circular coil is wrapped in metal mandrel, is a kind of general and efficient analytical method, and this kind instrument development is had important directive significance.
Description of drawings
Fig. 1 is drill collar groove and loop construction sketch map;
Fig. 2 is the variation relation of induced electromotive force with coil diameter;
Fig. 3 is the variation relation of induced electromotive force with the groove inner diameter;
Fig. 4 is the variation relation of induced electromotive force with groove length.
Among the figure: 1 is drill collar, and 2 is groove, and 3 is transmitting coil, and 4 is receiving coil.
The specific embodiment
Embodiment one: all be placed in the groove 2 of drill collar 1 basic sketch map such as Fig. 1 with transmitting coil that bores the electromagnetic resistivity quasi-instrument 3 and receiving coil 4.
The electromagnetic wave propagation that this instrument transmitting coil emits produces induced electromotive force to receiving coil.The size of induced electromotive force receives the electrical quantity of this instrument ambient medium and the influence of drill collar groove structure and coil and groove inwall distance.Size with these influences is the basis, and the method for making groove structure size and coil and groove inwall distance is following:
1, the working environment of this kind instrument is more abominable, requires it to have certain anti-twist ability, therefore provides the minimum diameter index R of this instrument according to the stress in the suffered external world of its working environment.
2, the minimum diameter index R with this instrument is a foundation, a given initial as far as possible reasonably groove size scope H
0
3, the initial diameter R of given transmitting coil and receiving coil
0And R
0 receives, scope is greater than the groove inwall and less than the drill collar outer wall.
4, suppose that the electric current on the transmitting coil is 1A; The selected rational initial groove size of requirement according to 2; A selected rational initial transmitting coil and the receiving coil size of requirement according to 3 is calculating this instrument induced electromotive force scope on the receiving coil in common stratum scope under this size.The size of this value is corresponding to the emission current of 1A.
5, the signal magnitude sent of transmitting coil is limited by the power index of emitter; Can calculate the size of current of transmitting coil emission according to the size of transmitter power in the reality; According to the relation of the corresponding induced electromotive force signal scope of the 1A emission current that calculates in 4, can calculate the induced electromotive force scope on the receiving coil under the actual conditions again.
6, the induced electromotive force signal that receives of receiving coil is gathered by receiver, and receiver has sensitivity and the dynamic range index that receives signal, can judge according to these indexs whether signal on 5 receiving coils that calculate can be received machine and receive.
7, by 6 judged result the apparatus structure size is adjusted; Change the size of receiving coil signal with this; It is received to guarantee when instrument is in the stratum that needs are measured that the signal of receiving coil can be received machine; Finally find the wide dark size of optimum groove and the distance of groove inwall and antenna, method of adjustment is:
1) diameter of change transmitting coil and receiving coil, receiving coil signal variation tendency is seen Fig. 2.But make it not allow to be subject to extraneous infringement, protective material and drill collar flush owing to will protective material be installed two coil outsides generally speaking.Then the distance of the diameter of these two coils and drill collar external diameter has a minimum size restrictions, and this size will depend on the thickness of protective material.This thickness limits the maximum gauge of coil.
2), change the diameter of groove inwall, receiving coil signal variation tendency is seen Fig. 3.But groove diameter is greater than the diameter index of making by 1, and can not surpass the diameter of coil.
3) length of change groove, receiving coil signal variation tendency is seen Fig. 4.
8, by 7 method of adjustment; The factors such as index, transmitter power index, receiver sensitivity and dynamic range index, drill collar minimum diameter index and coil protect material thickness index of the measurement stratum electrical parameter range of instrument be need consider simultaneously, rational groove size and groove inwall and coil-span size made.
2.2, the numerical simulation result analysis
The diameter of supposing drill collar is that (in is inch to 7in; 1in=0.54cm), the internal diameter of groove is 6in, the coil initial diameter is 6.5in; The length of groove is 10cm; The dispatch coil distance is 40in, and under the stratum of 0.1Ohmm, utilizing finite element method (FEM) to calculate the logical frequency of transmitting coil is 2.186 * 10 for the induced electromotive force on the receiving coil under the 1A current conditions of 2MHz
-8V.
At first analyze groove inwall and the coil-span rule that influences to signal, coil diameter is changed to 6.8in from 6.1in, the variation tendency of induced electromotive force is seen Fig. 2.From figure, find out that induced electromotive force increases along with the increase of coil diameter, excursion is approximately from 8 * 10
-10V to 6 * 10
-8V.
Following surface analysis receiving coil signal receives the Changing Pattern of groove inner diameter, and the groove inner diameter is increased to 6.4in gradually from 6in, and curve is as shown in Figure 3.Observe and find that the receiving coil signal reduces with the increase of groove inner diameter, scope is approximately from 2 * 10
-8V changes to 1 * 10
-9V.
Analyze the influence of the length of groove to signal afterwards, change to 12cm with length from 8cm this moment, and the change curve of receiving coil signal is seen Fig. 4.Observe and find that the receiving coil signal increases with groove length, but amplitude of variation is very little.
Can find out from top analysis; Distance between coil and the groove inwall will be far longer than the influence of the length of groove to signal to the influence of signal, and therefore, the length dimension to groove in actual engineering can be too harsh; As long as satisfy requirement of engineering; But the size of coil and groove inwall is wanted strict control, analyzes according to analysis thinking provided by the invention, makes the rational structure size.
Claims (2)
1. one kind with the formulating method that bores electromagnetic resistivity quasi-instrument drill collar groove size, it is characterized in that may further comprise the steps:
Step 1:, confirm the minimum diameter index R of this instrument according to the suffered extraneous stress of instrument working environment;
Step 2: the minimum diameter index R with this instrument is a foundation, a given first initial as far as possible reasonably depth of groove size range H
0
Step 3: and the initial diameter R of given first transmitting coil and receiving coil
0And R
0 receives, each coil scope is greater than the groove inwall and less than the drill collar outer wall;
Step 4: under the size condition in step 2 and step 3, suppose that the electric current on the transmitting coil is I, calculate this instrument induced electromotive force scope U on the receiving coil in common stratum scope; The size of this value U and the emission current I on the transmitting coil are functional relation P;
Step 5: the signal magnitude that transmitting coil sends is limited by the power index of emitter, calculates the electric current I of transmitting coil emission according to the size of transmitter power in the reality
xSize, again according to functional relation P in the step 4, calculate the induced electromotive force U on the receiving coil under the actual conditions
xScope;
Step 6: the induced electromotive force signal that receiving coil receives is gathered by receiver, and receiver has sensitivity and the dynamic range index that receives signal, according to the induced electromotive force U on the receiving coil that calculates in these index determining steps 5
xScope whether can be received machine and receive;
Step 7: the judged result according to step 6 is adjusted the apparatus structure size; Change the size of receiving coil signal with this; It is received to guarantee when instrument is in the stratum that needs are measured that the signal of receiving coil can be received machine; Finally find the wide dark size of optimum groove and the distance of groove inwall and antenna, method of adjustment is:
1) diameter of change transmitting coil and receiving coil;
2) diameter of change groove inwall, but groove diameter is greater than the minimum diameter index R that step 1 is made, and can not surpass the diameter of coil;
3) length of change groove.
2. according to claim 1 with the formulating method that bores electromagnetic resistivity quasi-instrument drill collar groove size; It is characterized in that: step 7 1) in; Protective material is installed in transmitting coil and receiving coil outside is made it not allow to be subject to extraneous infringement, the diameter of transmitting coil or receiving coil adds behind the thickness of protective material and the drill collar flush.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210141462.6A CN102678103B (en) | 2012-05-09 | 2012-05-09 | Method for determining size of groove of drill collar of while drilling electromagnetic wave electrical resistivity instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210141462.6A CN102678103B (en) | 2012-05-09 | 2012-05-09 | Method for determining size of groove of drill collar of while drilling electromagnetic wave electrical resistivity instrument |
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| Publication Number | Publication Date |
|---|---|
| CN102678103A true CN102678103A (en) | 2012-09-19 |
| CN102678103B CN102678103B (en) | 2015-02-18 |
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|---|---|---|---|
| CN201210141462.6A Expired - Fee Related CN102678103B (en) | 2012-05-09 | 2012-05-09 | Method for determining size of groove of drill collar of while drilling electromagnetic wave electrical resistivity instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996122A (en) * | 2012-11-27 | 2013-03-27 | 北京华航无线电测量研究所 | Electronic cabin with axial and peripheral adjustable resistivity |
| CN109424358A (en) * | 2017-08-24 | 2019-03-05 | 中国石油化工股份有限公司 | High-power resistivity logging while drilling sender unit |
Citations (4)
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|---|---|---|---|---|
| CN1677129A (en) * | 2004-04-01 | 2005-10-05 | 施卢默格海外有限公司 | A combined propagation and lateral resistivity downhole tool |
| CN201233782Y (en) * | 2008-06-11 | 2009-05-06 | 中国石油集团钻井工程技术研究院 | Transmission coil for real-time measuring and magnetic core thereof |
| CN101694157A (en) * | 2009-09-25 | 2010-04-14 | 中国电子科技集团公司第二十二研究所 | Method for shortening length of log tool and dual laterolog tool with electrode probe internally provided with electronic circuit |
| CN101881152A (en) * | 2009-05-04 | 2010-11-10 | 普拉德研究及开发股份有限公司 | Logging instrument with shielded triaxial antennas |
-
2012
- 2012-05-09 CN CN201210141462.6A patent/CN102678103B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1677129A (en) * | 2004-04-01 | 2005-10-05 | 施卢默格海外有限公司 | A combined propagation and lateral resistivity downhole tool |
| CN201233782Y (en) * | 2008-06-11 | 2009-05-06 | 中国石油集团钻井工程技术研究院 | Transmission coil for real-time measuring and magnetic core thereof |
| CN101881152A (en) * | 2009-05-04 | 2010-11-10 | 普拉德研究及开发股份有限公司 | Logging instrument with shielded triaxial antennas |
| CN101694157A (en) * | 2009-09-25 | 2010-04-14 | 中国电子科技集团公司第二十二研究所 | Method for shortening length of log tool and dual laterolog tool with electrode probe internally provided with electronic circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102996122A (en) * | 2012-11-27 | 2013-03-27 | 北京华航无线电测量研究所 | Electronic cabin with axial and peripheral adjustable resistivity |
| CN102996122B (en) * | 2012-11-27 | 2015-12-23 | 北京华航无线电测量研究所 | One has axially circumferential adjustable resistor rate electronic compartment |
| CN109424358A (en) * | 2017-08-24 | 2019-03-05 | 中国石油化工股份有限公司 | High-power resistivity logging while drilling sender unit |
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|---|---|
| CN102678103B (en) | 2015-02-18 |
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