CN110863820B - System for detecting lost circulation while drilling by adopting conductive indicating additive - Google Patents
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Abstract
The invention provides a system for detecting lost circulation while drilling by adopting conductive indicating additive, which comprises a real-time detection unit, an additive supply unit and a lost circulation judgment unit, wherein the real-time detection unit comprises a first conductive probe, a second conductive probe, a third conductive probe and a fourth conductive probe which are respectively arranged on a drilling tool and move along with a drill bit; the additive supply unit can add a conductive indicating additive to the drilling fluid; and the leakage judging unit receives the first, second, third and fourth resistance data, and judges and calculates the leakage level parameters and/or the leakage position of the target leakage layer. The invention adds the low or high conductivity indicating additive with quantitative and volume percentage concentration to the drilling fluid, and uses the probe arranged while drilling to detect the retention and loss conditions of the additive in the drilling fluid circulation while drilling system, thereby effectively tracing the position of the lost circulation and judging the strength of the lost circulation, and being beneficial to improving the detection speed and accuracy.
Description
Technical Field
The invention relates to the technical field of drilling fluid loss detection of petroleum and natural gas drilling, in particular to a system for detecting lost circulation while drilling by adopting a conductive indicating additive.
Background
Generally, the loss of drilling fluid into the formation or other interbedded formations through the exposed formation or through the missing damaged casing during the drilling and completion process is referred to as fluid loss, lost circulation, or lost circulation. The problems of instability of well walls, collapse caused by leakage and blowout caused by the leakage are main technical bottlenecks which restrict the speed of oil and gas exploration and development for a long time, and the leakage not only brings loss to drilling engineering, but also brings great difficulty to the exploration and development of oil and gas resources. If the leakage is not found in time or the depth of the leakage is not clear, the well kick or blowout is often caused, so that the life and property loss is caused, the drilling period is greatly influenced, and the drilling cost is increased. Lost circulation is so important for quality and safety control of the drilling process, and how to quickly and accurately find lost circulation becomes a focus of industrial attention, but due to the lack of mature and reliable identification technology, the finding and detection of lost circulation has been regarded as one of the worldwide problems in drilling engineering.
The inventor shows that the key to solving the lost circulation discrimination problem lies in two points: determining the location of the lost circulation and calculating the strength of the lost circulation. If the lost circulation can be determined and the grade of the lost circulation is calculated on the basis of timely finding the lost circulation by cutting into the lost circulation identification research based on the key points, the lost circulation can be effectively found and evaluated, the influence of the lost circulation on well drilling is prevented or slowed down by taking corresponding measures, well drilling accidents are prevented, and the safety of well drilling and the efficiency improvement and acceleration are improved.
The existing drilling fluid leakage position analysis usually adopts a comprehensive analysis method, does not have the capability of accurately and timely positioning the leakage position, increases the difficulty for leakage stoppage, and if the leakage position needs to be determined, instrument measurement methods, namely a spiral flowmeter method, a well temperature measurement method and the like, are mostly adopted, so that the timeliness is generally lacked, the construction period is greatly prolonged, and the drilling cost is increased.
The Chinese patent application with the publication number of CN108729868A and the publication date of 2018, 11 and 02 discloses a deep sea drilling overflow and lost circulation monitoring method. Upon analysis, the inventors showed that: the main disadvantages of the existing method include: 1. the discovery time is lagged for passive discovery and detection; 2. the detection carrier is only one drilling fluid originally filled or mixed with formation fluid, and cannot be adjusted and switched according to different formation properties; 3. the method is characterized in that a mass flowmeter is additionally arranged and the volume of the drilling fluid is measured, so that the method is single in physical property measurement, and the whole measurement system and a circulating manifold system of the fluid to be detected and the drilling fluid are huge, so that the accurate measurement is difficult; 4. because the metering equipment is arranged on the ground, the controlled influence factors come from a plurality of aspects such as underground, ground and the like, and an indirect measurement and detection method is adopted, the accurate positioning of the lost circulation position is difficult to realize; 5. because the measuring equipment is installed on the ground, the lost circulation is judged by volume measurement, and because the instrument is installed at a wellhead, if the lost circulation layer leaks again, the drilling layer or the lost circulation layer cannot be determined to leak again.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, it is an object of the present invention to provide a system capable of detecting lost circulation of drilling fluid during drilling and completion while drilling.
In order to achieve the above object, the present invention provides a system for detecting lost circulation while drilling using conductive indicating additives, the system comprising a real-time detection unit, an additive supply unit and a lost circulation determination unit, wherein the real-time detection unit comprises first, second, third and fourth conductive probes respectively disposed on a drilling tool and traveling along with a drilling tool, wherein the first, second, third and fourth conductive probes are capable of respectively measuring first, second, third and fourth lateral positions in real time, corresponding to first, second, third and fourth resistance data, the first and second lateral positions are equal to each other in distance from the drilling tool and the first lateral position is less than the second lateral position, the third and fourth lateral positions are equal to the drilling tool and the third lateral position is less than the fourth lateral position, the distance between the first lateral position and the drill bit is less than the distance between the third conductive probe and the drill bit, the first and third lateral positions are equidistant from the centerline, and the second and fourth lateral positions are equidistant from the centerline; the additive supply unit is capable of adding a conductivity indicating additive to the drilling fluid; and the lost circulation judging unit receives the first resistance data, the second resistance data, the third resistance data and the fourth resistance data of the first conductivity probe, the second conductivity probe, the third conductivity probe and the fourth conductivity probe of the real-time detection unit, and judges to obtain a target lost circulation layer according to the first resistance data, the second resistance data, the third resistance data and the fourth resistance data of each depth point.
In one exemplary embodiment of the invention, the first, second, third and fourth resistance data for each depth point in the target thief zone are satisfied where the conductivity indicating additive is a low conductivity indicating additive having a resistance greater than the average resistance of the formation: the first resistance data is an abnormally high value while the second resistance data is a normal value, and the third resistance data is an abnormally high value while the fourth resistance data is an abnormally high value or a normal value, the abnormally high value being higher than the normal value. Further, where the conductivity indicating additive is a high conductivity indicating additive having a resistance less than the average formation resistance, the first, second, third, and fourth resistance data for each depth point in the target thief zone satisfy: the first resistance data is an abnormally low value while the second resistance data is a normal value, and the third resistance data is an abnormally low value while the fourth resistance data is an abnormally low value or a normal value, and the abnormally low value is smaller than the normal value.
In an exemplary embodiment of the present invention, the lost circulation determination unit may calculate the lost circulation level parameter of the target lost circulation layer by equation 1, where equation 1 is:
wherein, k (x) D ) The leak level judgment parameter, x, for the depth point D 1D ＝lnR 1 ，x 3D ＝lnR 3 ，R 1 And R 3 First and third resistance values T of the depth point D D The absolute value of the time difference of the first and third conductivity probes passing through the depth point D is alpha, which is a volume conversion coefficient.
In an exemplary embodiment of the present invention, the lost circulation determination unit may determine the lost circulation position of the target lost circulation layer by equation 2, where equation 2 is:
H k ＝P-L
wherein the well leakage position of the target leakage layer is H k P is the current drilling position and L is the distance from the third conductivity probe to the drill bit.
In an exemplary embodiment of the invention, the additive supply unit may further comprise a sampling supplement mechanism, and the sampling supplement mechanism judges according to the sampling result of the drilling fluid under the preset condition and supplements the conductive indication additive to the drilling fluid through the additive supply unit in time. Further, the predetermined condition includes any one of: when every 30 cycle weeks are completed; before and after the drilling fluid is treated; deviation of more than 20% occurs between the reading of the instrument and manual counting; and the occurrence of large scale oil and gas lost circulation displays, including drilling fluid lost circulation.
Drawings
FIG. 1 is a schematic diagram illustrating the use of an exemplary embodiment of the system for detecting lost circulation while drilling with a conductive indicator additive of the present invention;
FIG. 2 is a graph showing a lost circulation pattern of the well of FIG. 1 using a low conductivity indicating additive;
FIG. 3 shows a lost circulation pattern chart for the well in FIG. 1 using a high conductivity indicating additive.
Detailed Description
Hereinafter, the system for detecting lost circulation while drilling using the conductive indicating additive of the present invention will be described in detail with reference to the exemplary embodiments. The system can solve the problem that the drilling fluid is exposed in a mixed fluid system filled with the drilling fluid and the formation fluid after being cut and crushed by the drill bit in the drilling process, and the generated drilling fluid is separated from the mixed fluid system through the cutting surface due to pressure difference, enters the formation and loses the control of a drilling fluid circulating system to enter the formation to generate leakage.
In one exemplary embodiment of the present invention, a system for detecting lost circulation while drilling with a conductive indicator additive may include a real-time detection unit, an additive supply unit, and a lost circulation determination unit.
Specifically, the real-time detection unit includes first, second, third and fourth conductivity probes respectively provided on the drilling tool and traveling along with the drill bit. The first conductivity probe can measure a first lateral position in real time to obtain first resistance data; the second conductivity probe can measure a second lateral position in real time to obtain second resistance data; the third conductivity probe can measure a third lateral position in real time to obtain third resistance data; and the fourth conductivity probe can measure the fourth lateral position in real time to obtain fourth resistance data. The first and the second lateral positions are equal to the distance between the drill bits, and the distance between the first lateral position and the center line of the drilling tool is smaller than the distance between the second lateral position and the center line; the third and fourth lateral positions are equidistant from the drill bit, and the third lateral position is less distant from the center line of the drilling tool than the fourth lateral position; the distance between the first or second lateral position and the drill bit is less than the distance between the third or fourth conductivity probe and the drill bit; and the first and third lateral positions are equidistant from the centerline and the second and fourth lateral positions are equidistant from the centerline. Here, the first, second, third, and fourth lateral positions correspond to first, second, third, and fourth radial detection ranges around the centerline of the drill string. For example, the radial detection range of the second and fourth conductive probes can be about 2-3 meters; the radial detection range of the first and third conductive probes can be about 0.5-1 m. The first and second conductivity probes may be integrally formed as a proximal electrode to detect deep lateral and shallow lateral data, respectively, of the proximal end of the drill bit; the third and fourth conductivity probes may be integrally formed as distal electrodes to detect deep lateral and shallow lateral data, respectively, of the distal end of the drill bit. The "deep lateral direction" corresponds to a deep radial extent, and the "shallow lateral direction" corresponds to a shallow radial extent.
The additive supply unit is capable of adding a conductivity indicating additive to the drilling fluid to facilitate detection and data collection by the first, second, third and fourth conductivity probes of the real-time detection unit. Here, the conductivity indicating additive may be a low conductivity indicating additive having a resistance greater than the formation resistance (e.g., the average resistance of the target formation); or may be a high conductivity indicating additive having a resistance less than the formation resistance (e.g., the average resistance of the target formation).
The well leakage judging unit receives the first resistance data, the second resistance data, the third resistance data and the fourth resistance data of the first conductivity probe, the second conductivity probe, the third conductivity probe and the fourth conductivity probe of the real-time detection unit, and judges the target leakage layer according to the first resistance data, the second resistance data, the third resistance data and the fourth resistance data of each depth point. For example, the lost circulation determination unit may include a calculator, a memory, a display, and the like. For example, where the conductivity indicating additive is a low conductivity indicating additive having a resistance greater than the average formation resistance, the first, second, third, and fourth resistance data for each depth point in the target thief zone satisfy: the first resistance data is an abnormally high value while the second resistance data is a normal value, and the third resistance data is an abnormally high value while the fourth resistance data may be an abnormally high value or a normal value, the abnormally high value being higher than the normal value. As another example, where the conductivity indicating additive is a high conductivity indicating additive having a resistance less than the average resistance of the formation, the first, second, third, and fourth resistance data for each depth point in the target thief zone satisfy: the first resistance data is an abnormally low value while the second resistance data is a normal value, and the third resistance data is an abnormally low value, while the fourth resistance data may be an abnormally low value or a normal value, and the abnormally low value is less than the normal value. The fourth resistance data is specifically an abnormally low value or a normal value, and can be determined according to the drilling rate, the lost circulation rate and the distance between the fourth conductivity probe and the drill bit, but the depth point can be determined to be in the target lost circulation layer with lost circulation no matter the fourth resistance data is the abnormally low value or the normal value.
FIG. 1 shows a schematic representation of the use of an exemplary embodiment of the system for detecting lost circulation while drilling using a conductive indicator additive of the present invention.
As shown in FIG. 1, in an exemplary embodiment of the present invention, the use of a system for detecting lost circulation while drilling with a conductive indicator additive may include the steps of:
1) determining the type and dosage of conductivity indicating additive (also called conductivity indicator or indicator);
2) the method comprises the following steps that (1) conductivity detectors (namely, a first conductivity probe, a second conductivity probe, a third conductivity probe and a fourth conductivity probe) are additionally arranged on a drilling tool part close to a drill bit in pairs and used for detecting the outer annular space between the outer side of the drilling tool and a stratum cutting surface exposed after the drilling tool is crushed by the drill bit in a detection range and the content change condition of an indicating additive in a stratum range of conductivity (for example, the depth is 1-3 m);
3) establishing a discrimination mode for judging that the drilling fluid carrying the indicative additive enters the stratum condition through the leakage phenomenon according to the conductivity reading change condition of the detector;
4) determining the location of the drilling fluid loss and/or determining the loss strength.
Here, the dosage of the indicating additive to the wellbore drilling fluid is determined based on the formation properties to be measured and the physical differences between the additive and the conductivity detected using the detector. The conductivity indicating additive is a low conductivity indicating additive having a resistance greater than the average resistance of the formation or may be a high conductivity indicating additive having a resistance less than the average resistance of the formation.
In step 1), the drilling fluid is saturated in a container which is closed on the earth surface and is not influenced by environmental electromagnetism through a simulation test, and the lowest dosage volume percentage concentration Mg capable of detecting the mixed conductivity indicating additive is determined r And if the well bore is pumped into the circulating drilling fluid, the volume total amount of the part to be pumped in the underground circulation and the ground is U, then:
conductivity feature indicating additive mass M to ensure achievement of a percent concentration by volume of probing r Is M r ＝Mg r ·U。
In addition, in the drilling process, the drilling fluid may be influenced by lost circulation, surface manifold sedimentation, underground drilling tool adhesion, open channel running loss of the vibrating screen and other drilling fluids flowing through, and the drilling fluid including the indicating additive adopted by the invention may be lost, so that the detection effect of a detector is reduced, and the data analysis and application of the subsequent steps may be influenced. Therefore, drilling fluid sampling, volume percent concentration detection and timely replenishment of the indicative additives can be performed in any of the following situations: a. when every 30 cycle weeks are completed; b. before and after the drilling fluid is treated; c. deviation of more than 20% occurs between the instrument reading and manual counting, the instrument reading refers to the reading of drilling fluid detected by a surface detection instrument before entering a shaft, and the manual counting refers to the value manually measured by the drilling fluid returned from the shaft; d. situations occur where a large scale oil and gas water leak display occurs, including drilling fluid lost circulation.
In addition, under the condition that no test and detection conditions are met, quantitative feeding of an indicative additive is carried out, the fact that the adding dosage of each liter of drilling fluid is g is determined through the test, the difference of the conductivity of each liter of drilling fluid is required to be the same as that of a stratum to be detected, the adding dosage of each liter of drilling fluid is determined according to the difference of parameters of the stratum to be detected, hydrogen column elements with the mass-volume ratio of 100Mg/L are added according to the volume condition of a shaft in the drilling process according to the stratum characteristics and the additive difference condition, and the total mass Mg resident in the shaft is 100 XU is 100 Umg.
In the step 2), the conductivity detectors are added in pairs at the part of the drilling tool close to the drill bit, and each conductivity detector is provided with a pair of probes and comprises a far-end probe group of the drill bit and a near-end probe group of the drill bit, wherein the far-end probe group and the near-end probe group of the conductivity detector respectively comprise a deep detection range probe and a shallow detection range probe. For example, taking the lateral resistance as an example, the distal paired-probe group is composed of a third conductivity probe and a fourth conductivity probe, and the lateral (corresponding to the radial) probing depth of the third conductivity probe is smaller than the lateral (corresponding to the radial) probing depth of the fourth conductivity probe. The proximal paired probe set is composed of a first conductivity probe and a second conductivity probe, and the lateral probing depth of the first conductivity probe is smaller than that of the second conductivity probe. Here, the first, second, third, and fourth lateral positions correspond to a first, second, third, and fourth radial detection range around the centerline of the drill string. For example, the detection range of the second and fourth conductive probes can be about 2-3 meters; the detection range of the first and third conductive probes can be about 0.5-1 m. The first and second conductivity probes may be integrally formed as a proximal electrode to detect deep lateral and shallow lateral data, respectively, of the proximal end of the drill bit; the third and fourth conductivity probes may be integrally formed as distal electrodes to detect deep lateral and shallow lateral data, respectively, of the distal end of the drill bit. The "deep lateral direction" corresponds to a deep radial extent, and the "shallow lateral direction" corresponds to a shallow radial extent.
The lost circulation discrimination mode based on the conductivity detector may be as follows:
taking lateral resistance as an example, let the time of well leakage occurrence be t 0 The current depth of the drill bit is H 0 The contact time of the proximal probe group (i.e. the first conductive probe and the second conductive probe) of the conductive probe is t 1 Contact depth (i.e., depth from ground) of H 1 The contact time of the distal probe set (i.e., the third and fourth conductive probes) of the conductive probe is t 2 A contact depth of H 2 The reading of the near-end deep lateral probe at the well depth H suspected of generating the well leakage of a certain meter to be detected is recorded as XJ d (i.e., second resistance data), the proximal shallow lateral probe reading is recorded as XJ s (i.e., first resistance data), distal deep lateral probe readings are recorded as XY d (i.e., fourth resistance data), distal shallow lateral probe readings are recorded as XY s (i.e., third resistance data) with a distal and proximal probe mounting spacing of M-H 2 -H 1 。
(i) And no well leakage occurs during normal drilling
The following relationships exist for the near and far probe readings at well depth H:
XJ d ＝XY d and XJ s ＝XY s
At this time, the reading of the probe in which the well leakage does not occur during normal drilling is used as a normal value (also referred to as a reference value), for example, the first, second, third, or fourth resistance data corresponding to the situation is used as a normal value, or the average value of the first, second, third, and fourth resistance data is used as a normal value.
(ii) The situation of well leakage at a certain depth point for the first time during drilling
When a high resistivity conductivity indicating additive (i.e., a low conductivity indicating additive) is added, the time t for the occurrence of lost circulation is taken 0 Before the time t when the near-end probe of the conductivity detector reaches the well leakage occurrence well depth 1 If the near-end detector is delayed from the actual lost circulation occurrence time by t1-t0, the delay time of the far-end probe is t2-t1, and the delay travel is M, at this time, the reading of the near-end probe and the reading of the far-end probe have a certain difference, and the original stratum XJ is assumed s ＝XJ d Then, there are:
XJ s -XJ d > 0, and XY d And XY s Are all abnormally high values; or XY d Is abnormally high value, and XY s Is a normal value.
That is, the conductivity detector (e.g., the first, second, third, and fourth conductivity probes) is used to detect the change of the resistivity parameter after the conductivity indicating additive enters the formation, and since the conductivity indicating additive added into the drilling fluid system is a high-resistance substance, if the formation leaks, the resistivity logging while drilling has a significant resistivity increase trend, and this is used as the leak detection determination parameter. In this case, a case where a well leakage occurs at a well depth or an interval where the well leakage occurs will occur simultaneously with a shallow lateral (e.g., a first lateral position) abnormally high value and a deep lateral (e.g., a second lateral position) normal value in a proximal probe set of the conductive probe, and a case where a shallow lateral (e.g., a third lateral position) abnormally high value and a deep lateral (e.g., a fourth lateral position) abnormally high value or normal value in a distal probe set of the conductive probe. For example, a resistance curve based on a lost circulation discrimination pattern of a low conductivity indicating additive and its probe may be as shown in fig. 2.
Similarly, when a low resistivity conductivity-indicating additive (i.e., a high conductivity-indicating additive) is added, the proximal probeThe case where there is some difference between the head reading and the distal probe reading, and assuming undisturbed formation XJ s ＝XJ d Then, there are:
XJ s -XJ d < 0, and XY d And XY s Are all abnormally low values; or XY d Is abnormally low and XY s Is a normal value.
For example, a resistance curve based on a lost circulation discrimination pattern of a highly conductive indicating additive and its probe may be as shown in FIG. 3.
In the step 4), the judgment based on the conductivity detector and the conductivity indicating additive leakage position and the analysis of the leakage condition are as follows:
let the resistivity value of a certain depth D of the formation be R, x be the logarithmic expression of the resistivity value x ═ lnR, so the first, second, third and fourth resistivity data correspond to x respectively 1 、x 2 、x 3 And x 4 The curves of the bars are shown as,
wherein the coefficient of difference in conductivity is D e I.e. D e >0.2 judgment of lost circulation, x 1D First resistance data, x, for depth D points 3D The third resistance data is depth D point. If D is e If the value is greater than 0.2, the well leakage can be judged as D of the continuous depth section e If the values are all larger than 0.2, the well leakage section is judged.
The lost circulation location may satisfy the following equation:
H k ＝P-L
wherein the well leakage position of the target leakage layer is H k P is the current drilling position and L is the distance from the distal electrode to the drill bit.
While the lost circulation rating may be determined by:
wherein, k (x) D ) Is composed ofLeak level determination parameter, x, for depth D point 1D ＝lnR 1 ，x 3D ＝lnR ３ ，R 1 And R 3 First and third resistance values T of the depth point D D The time from the near electrode depth D point to the far electrode passing the depth D point, the distance between the far electrode and the near electrode is determined by the drilling tool assembly, alpha is a volume conversion coefficient, and the conversion coefficients of the indicators with different concentrations and volumes are different and can be determined through experiments. The lost circulation grade of the lost circulation segment can be determined by averaging.
Therefore, the judgment of the leakage position of the drilling fluid based on the conductivity indicating additive in the drilling process and the analysis of the leakage condition are completed through the steps.
In summary, the advantages of the invention include one or more of the following:
1. by adding the quantitative indicating additive with the volume percentage concentration kept in the drilling fluid and detecting the keeping and loss conditions of the additive in a drilling fluid circulation while drilling system by using a probe arranged while drilling, the position of the lost circulation while drilling can be effectively traced and the strength of the lost circulation while drilling can be judged.
2. By adopting the active near-bit while drilling real-time detection, the discovery time is not influenced by the upward return time of the drilling fluid and the manifold delay, the performance is better in the aspect of discovery time, and the discovery and detection speed is faster.
3. The physical and chemical properties can be judged according to the difference of the drilling fluid, the stratum and the indicative additive in the aspect of conductivity, the detector is close to the effective position of the additive, the detection counting time and the time difference of the detected lost circulation event are detected, and the measurement is more direct and accurate.
4. The additive and the detector are arranged at the position close to the near drill bit close to the latest drilling and uncovering well depth in the well, so that the interference of a shaft system and the ground is less, and the well leakage position can be further accurately and directly determined.
5. It can be determined whether a lost circulation layer is leaking again, for example, whether a well is leaking in the drilling layer, if the well is not leaking in the drilling layer and the drilling fluid is abnormally reduced, the lost circulation layer can be determined as leaking again.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (6)
1. A system for detecting lost circulation while drilling by adopting conductive indicating additive is characterized by comprising a real-time detection unit, an additive supply unit and a lost circulation judgment unit, wherein,
the real-time detection unit comprises a first conductive probe, a second conductive probe, a third conductive probe and a fourth conductive probe which are respectively arranged on the drilling tool and travel along with the drilling tool, wherein the first conductive probe, the second conductive probe, the third conductive probe and the fourth conductive probe can respectively measure a first lateral position, a second lateral position, a third lateral position and a fourth lateral position in real time, and correspondingly obtain first resistance data, a second resistance data, a third resistance data and a fourth resistance data, the first lateral position and the second lateral position are equal, the distance between the first lateral position and the drilling tool is smaller than the distance between the second lateral position and the central line of the drilling tool, the distance between the third lateral position and the drilling tool is equal, the distance between the third lateral position and the drilling tool is smaller than the distance between the third conductive probe and the drilling tool, the distance between the first lateral position and the third lateral position is equal to the central line, and the second and fourth lateral positions are equidistant from the centerline;
the additive supply unit is capable of adding a conductivity indicating additive to the drilling fluid;
the well leakage judging unit receives first resistance data, second resistance data, third resistance data and fourth resistance data of first conductivity probes, second conductivity probes, third conductivity probes and fourth conductivity probes of the real-time detection unit, and judges a target leakage layer according to the first resistance data, the second resistance data, the third resistance data and the fourth resistance data of each depth point;
the lost circulation judging unit calculates a lost circulation grade parameter of a target lost circulation layer by the formula 1,
the formula 1 is:
wherein, k (x) D ) The leak level judgment parameter, x, for the depth point D 1D ＝lnR 1 ，x 3D ＝lnR 3 ，R 1 And R 3 First, third resistance data, T, of depth point D, respectively D The absolute value of the time difference of the first and third conductivity probes passing through the depth point D is alpha, which is a volume conversion coefficient.
2. The system for detecting lost circulation while drilling with an electrically conductive indicating additive of claim 1, wherein the first, second, third and fourth resistance data for each depth point in the target lost circulation zone are satisfied where the electrically conductive indicating additive is a low electrically conductive indicating additive having a resistance greater than the average resistance of the formation: the first resistance data is an abnormally high value while the second resistance data is a normal value, and the third resistance data is an abnormally high value and the fourth resistance data is an abnormally high value or a normal value, the abnormally high value being higher than the normal value.
3. The system for detecting lost circulation while drilling with a conductive indicating additive of claim 1, wherein the first, second, third and fourth resistance data for each depth point in the target lost circulation zone are satisfied where the conductive indicating additive is a high conductive indicating additive having a resistance less than the average resistance of the formation: the first resistance data is an abnormally low value while the second resistance data is a normal value, and the third resistance data is an abnormally low value, and the fourth resistance data is an abnormally low value or a normal value, and the abnormally low value is smaller than the normal value.
4. The system for detecting the lost circulation while drilling by using the conductive indicating additive as claimed in claim 1, wherein the lost circulation determination unit determines the lost circulation position of the target lost circulation layer by equation 2,
the formula 2 is:
H k ＝P-L
wherein the well leakage position of the target leakage layer is H k P is the current drilling position and L is the distance from the third conductivity probe to the drill bit.
5. The system for detecting the lost circulation while drilling by using the conductive indicating additive as claimed in claim 1, wherein the additive supply unit further comprises a sampling supplement mechanism, and the sampling supplement mechanism judges according to the sampling result of the drilling fluid under the preset condition and supplements the conductive indicating additive into the drilling fluid through the additive supply unit in time.
6. The system for detecting lost circulation while drilling with the electrically conductive indicating additive of claim 5, wherein the predetermined condition comprises any one of: at the completion of every 30 cycles; before and after the drilling fluid is treated; deviation of more than 20% occurs between the reading of the instrument and manual counting; and the occurrence of large scale oil and gas lost circulation displays, including drilling fluid lost circulation.
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| CN201911403339.5A Active CN110872948B (en) | 2019-07-24 | 2019-12-30 | System for actively detecting lost circulation by utilizing radioactive indicator |
| CN201911397888.6A Active CN110924938B (en) | 2019-07-24 | 2019-12-30 | Well leakage while drilling active detection system with high accuracy |
| CN201911397085.0A Active CN110863821B (en) | 2019-07-24 | 2019-12-30 | Method for detecting lost circulation while drilling by using low-conductivity indicating additive |
| CN201911396906.9A Active CN110863820B (en) | 2019-07-24 | 2019-12-30 | System for detecting lost circulation while drilling by adopting conductive indicating additive |
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| CN201911398164.3A Active CN110905487B (en) | 2019-07-24 | 2019-12-30 | High-accuracy well leakage active comprehensive detection method |
| CN201911398328.2A Active CN110847897B (en) | 2019-07-24 | 2019-12-30 | Method for actively detecting lost circulation by using radioactive indicator |
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| CN112112633A (en) * | 2020-09-30 | 2020-12-22 | 中国石油天然气集团有限公司 | Drilling stratum leak source measuring instrument and judging method |
| CN112211619A (en) * | 2020-11-19 | 2021-01-12 | 中国石油天然气集团有限公司 | Method for rapidly determining lost circulation position in long open hole section |
| CN117846581A (en) * | 2023-12-29 | 2024-04-09 | 东营安兴石油科技有限公司 | Petroleum drilling leakage layer position detection method and detection system |
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