CN110847897A - Method for actively detecting lost circulation by using radioactive indicator - Google Patents
Method for actively detecting lost circulation by using radioactive indicator Download PDFInfo
- Publication number
- CN110847897A CN110847897A CN201911398328.2A CN201911398328A CN110847897A CN 110847897 A CN110847897 A CN 110847897A CN 201911398328 A CN201911398328 A CN 201911398328A CN 110847897 A CN110847897 A CN 110847897A
- Authority
- CN
- China
- Prior art keywords
- well
- lost circulation
- detection point
- gamma value
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 152
- 238000005553 drilling Methods 0.000 claims abstract description 113
- 239000012530 fluid Substances 0.000 claims abstract description 57
- 230000015572 biosynthetic process Effects 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000001502 supplementing effect Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 6
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
Landscapes
- Geology (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geophysics And Detection Of Objects (AREA)
- Examining Or Testing Airtightness (AREA)
- Measurement Of Radiation (AREA)
- Drilling And Boring (AREA)
Abstract
The invention provides a method for actively detecting lost circulation by using radioactive indicators, which comprises the following steps: adding a predetermined content of radioactive indicator into the drilling fluid while drilling; sequentially arranging a first gamma value detection point and a second gamma value detection point at the near-bit end of the drilling tool along the opposite drilling direction; the method comprises the steps that a first gamma value detection point and a second gamma value detection point respectively detect gamma values of radioactive indicators at different well depths in a stratum to be detected, and whether well leakage exists at the well depths is judged according to the change condition of the first gamma value detection point and the second gamma value detection point at the same well depth detection value; and calculating the drilling fluid loss position while drilling. The invention can realize the active detection of the position of the lost circulation, and has high lost circulation finding speed and short delay time.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration, in particular to a method for actively detecting lost circulation by using a radioactive indicator. The invention is particularly suitable for the situation that the drilling fluid which is cut and crushed by the drill bit and is exposed in the mixed liquid system filled with the drilling fluid and the stratum fluid enters the stratum through the cutting surface due to the pressure difference and is separated from the mixed liquid system, and loses the control of the circulating system of the drilling fluid to enter the stratum to cause leakage.
Background
The phenomenon that drilling fluid is lost into a stratum or other interlayers through an exposed stratum or a damaged casing which is lost in the drilling and completion process is called drilling fluid loss, namely lost circulation.
The problems of borehole instability, collapse due to leakage and blowout caused by the leakage are the main technical bottlenecks which restrict the oil-gas exploration and development speed for a long time, and the occurrence of the leakage not only brings loss to the drilling engineering, but also brings great difficulty to the exploration and development of oil-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 of great importance for quality and safety control of the drilling process. How to quickly and accurately find the well leakage becomes a focus of industrial attention. However, due to the lack of sophisticated and reliable identification techniques, the discovery and detection of lost circulation has been considered as one of the worldwide problems in drilling engineering.
The existing method for analyzing the drilling fluid leakage position generally adopts a comprehensive analysis method, but the method does not have the capability of accurately and timely positioning the leakage position, thereby increasing the difficulty for plugging. If the position of the lost circulation needs to be determined, instrumental methods, namely a spiral flowmeter method, a well temperature measuring method, a resistivity measuring method and the like are adopted, the timeliness of the methods is generally poor, the construction period is greatly prolonged, and the drilling cost is increased.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, it is an object of the present invention to provide a method for directly and accurately detecting the location of lost circulation using radioactive indicators.
The invention provides a method for actively detecting lost circulation by using radioactive indicators, which comprises the following steps: adding a predetermined content of radioactive indicator into the drilling fluid while drilling; sequentially arranging a first gamma value detection point and a second gamma value detection point at the near-bit end of the drilling tool along the opposite drilling direction; the method comprises the steps that a first gamma value detection point and a second gamma value detection point respectively detect gamma values of radioactive indicators at different well depths in a stratum to be detected, and whether well leakage exists at the well depths is judged according to the change condition of the first gamma value detection point and the second gamma value detection point at the same well depth detection value.
In one exemplary embodiment of the method of the present invention for actively detecting lost circulation using a radioactive indicator, if lost circulation occurs, the lost circulation occurs at a time earlier than the time at which the first gamma detection point reaches the depth of the well to be detected.
In one exemplary embodiment of the method of the present invention for actively detecting lost circulation using a radioactive indicator, the method further comprises determining the type of radioactive indicator to be added and the dosage to be added based on the formation properties prior to adding the radioactive indicator to the drilling fluid.
In an exemplary embodiment of the method for actively detecting lost circulation using radioactive indicators of the present invention, the method further comprises determining whether a lost circulation exists in the deep well under examination or not, and determining whether the lost circulation exists in the drilling formation or the leaking formation, wherein the determining method may comprise: if the well depth to be detected judges that the well leakage exists, the well leakage occurs on the positive drilling layer; and if the well depth to be detected is judged to have no leakage but the drilling fluid is reduced, judging that the leakage layer is leaked again.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can realize the active detection of the position and the leakage strength of the lost circulation, and has high lost circulation finding speed and short delay time;
(2) the invention can adjust and replace the type and concentration of the radioactive indicator according to different stratum properties, and the detection method is more accurate and flexible;
(3) the method has the advantages that the position of the lost circulation is judged directly and accurately;
(4) the method can judge the well leakage of the positive drilling layer and the re-leakage of the leaking layer and can determine whether the re-leakage occurs.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 shows a simplified schematic flow diagram of a method for actively detecting lost circulation using radioactive indicators in accordance with an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, a method for actively detecting lost circulation using a radioactive indicator according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
In one exemplary embodiment of the method for actively detecting lost circulation using a radioactive indicator of the present invention, as shown in fig. 1, the method for detecting lost circulation may include:
s01, adding a radioactive indicator into the drilling fluid while drilling and controlling the content of the radioactive indicator in the drilling fluid while drilling;
s02, respectively setting a first gamma value detection point and a second gamma value detection point at the near-bit end of the drilling tool along the opposite drilling directions;
s03, the first gamma value detection point and the second gamma value detection point respectively detect gamma values of radioactive indicators at different well depths in the stratum to be detected, and according to the change situation of the first gamma value detection point and the second gamma value detection point in the same well depth detection value, whether well leakage exists at the well depth or not is judged, and leakage strength is determined.
In this embodiment, the method for detecting lost circulation may further include determining the type and dosage of the radioactive indicator before the step S01.
In the above, the adding type of the radioactive indicator can be determined according to the property of the stratum to be detected, and can be adjusted according to different stratum properties. Different types of indicators can be optionally added into the drilling fluid so as to realize switching according to different strata in the process of detecting lost circulation. The radioactive indicator may be a radioactive hydrogen element. Of course, the kind of the radioactive indicator of the present invention is not limited thereto.
The dosage of the radioactive indicator is related to the property of the stratum to be detected and the lowest gamma value capable of being detected at the gamma value detection point, and the dosage can be adjusted according to the specific property of the stratum to be detected and the lowest gamma value capable of being detected at the gamma value detection point. For example, the minimum added dose of the radioactive indicator can be determined by:
through simulation experiments, namely in the saturated drilling fluid which is closed on the earth surface and is not influenced by environmental radioactivity and electromagnetism, the volume percentage concentration M of the lowest dosage of the added radioactive indicator can be detected by the second gamma value detection point and the first gamma value detection pointgg. Setting the well bore to pump the circulating drilling fluid includes circulating and pumpingThe total volume of the part to be pumped is U (the total volume of the drilling fluid to be pumped in the underground circulation and the surface), and the minimum adding dose M of the radioactive indicatorgCan be as follows:
Mg＝Mgg.U。
in this embodiment, in order to better detect the change of the radioactive indicator in the drilling fluid, the difference coefficient between the radioactive indicator and the formation to be detected needs to be greater than 0.2, and the difference coefficient is:
wherein D isgRepresenting the coefficient of difference, G, of the radioactive indicator from the formationtRepresents the natural radioactivity of the radioactive indicator; gdRepresenting the average of the natural radioactivity of the formation.
In this embodiment, the second gamma detection point and the first gamma detection point may be disposed at a drill portion near the drill bit. The well leakage detection device is arranged at a position close to the drill bit, so that the well leakage detection speed can be higher. The second gamma value detection point and the first gamma value detection point are arranged at a certain distance in the drilling direction (the first gamma value detection point is closer to the drill bit than the second gamma value detection point). The second gamma value detection point and the first gamma value detection point can pass through the same well depth to be detected at different moments. If the well leakage occurs at the deep position of the well to be detected, the stratum and the drilling fluid can generate fluid exchange, the concentration of the radioactive indicator in the drilling fluid is influenced, and the existence of the well leakage at the deep position of the well to be detected can be judged according to the change of the detection values of the second gamma value detection point and the first gamma value detection point.
In the above, the distance between the second gamma value detection point and the first gamma value detection point along the drilling direction may be set according to parameters such as formation property and drilling speed.
In this embodiment, the step S03 of determining whether there is lost circulation in the deep well to be detected may include the following steps:
according to the formula
Comparison DeWith a threshold value delta, if DeIf D is less than or equal to delta, judging that no leakage exists in the well depth, and if D is less than or equal to deltaeIf the well depth is larger than delta, the well leakage exists at the well depth, wherein GR1For the first gamma detection point at the well depth, GR2The threshold value δ may be related to a volume conversion factor α of the radioactive indicator drilling fluid gamma value, the threshold value δ may be identified during experimental determination of the volume conversion factor α.
In this embodiment, the step S03 of determining whether there is lost circulation in the deep well to be detected may include the following steps:
in the stratum to be detected, the lost circulation judgment can be carried out on different well depths in the drilling process. For example, for a depth of a well to be inspected at a certain depth, the second gamma value detection point is located at a certain distance from the first gamma value detection point along the drilling direction, and the first radiation indicator detection point is closer to the drill bit than the second gamma value detection point. In the drilling process, the first gamma value detection point passes through the depth of the well to be detected before the second gamma value detection point. And judging whether the well leakage exists in the deep part of the well to be detected or not according to the change conditions of a first detection value obtained by detecting the first gamma value detection point and a second detection value obtained by detecting the second gamma value detection point.
If the second detection value is equal or approximately equal to the first detection value, judging that no well leakage occurs at the well depth;
and if the second detection value is larger than the first detection value, determining that the well leakage is suspected to occur at the well depth. It is desirable to further calculate the rate at which drilling fluid at the depth of the well is lost to the formation. And if the speed is greater than the standard value, judging that the well leakage occurs at the well depth. As described above, the second detection value being approximately equal to the first detection value may be a detection value in which the difference between the first detection value and the second detection value is in the range of 2% or less.
For example, at a certain well depth a first gamma detection point reaches the well depth and the detection value of the well depth is xj. The second gamma value detection point reaches the well depth and the detection value of the well depth detection is xy. The vertical distance between the first gamma value detection point and the second gamma value detection point is L.
(1) For the case of normal drilling without well leakage at the deep well, xj＝xy。
(2) During drilling, well leakage occurs at the deep part of the well for the first time; if there is x at this timej＜xiAnd judging that the well is suspected to have the leakage at the well depth.
For the well depth judged as the suspected lost circulation, further determining whether the suspected lost circulation occurrence position meets the standards of the lost circulation can be used for judging whether the lost circulation exists at the well depth.
If the well leakage happens at a certain well depth of the stratum, when the first gamma value detection point reaches the well depth, recording a first detection value detected by the first gamma value detection point as GR1When the second gamma value detection point reaches the well leak point, the second detection value detected by the second gamma value detection point is recorded as GR2Then, there are:
GR1＝GR2-b；
where b is a constant representing the difference between the second detection value and the first detection value.
The rate of the well depth drilling fluid loss to the formation is calculated by the following formula:
wherein Q is the speed of the drilling fluid lost to the stratum at the well depth; GR1Representing a first detection value; GR2Representing a second test value, α is a volume conversion factor for the gamma value of the drilling fluid containing the radioactive indicator of the current concentration, the α value can be determined experimentally, t is the time elapsed from the first gamma point to the second gamma point to the depth of the well, α is the sum of the different concentrations of the indicatorFor those skilled in the art, a gamma value record of the change of the indicator concentration and the drilling fluid volume can be obtained to obtain α values.
In this embodiment, the method may further include determining a lost circulation segment length according to lost circulation determination at different depths of the well, wherein determining the lost circulation segment length includes: setting interval lengths among detection well depths in a logging-while-drilling process; and judging the conditions of the well leakage according to the well leakage of each well depth, if the well leakage exists in a plurality of continuous well depths, the length of the well leakage section is the sum of the interval lengths among the well depths in the continuous well depths. Different detection intervals of logging while drilling can be set in the stratum to be detected, namely, the interval length between the well depths is set when the well depths are judged in the stratum to be detected. For example, in the logging while drilling process, 1m is used as the interval of each detection point, so that the lost circulation determination is performed every 1m, and after the determination of a plurality of detection points, a plurality of detection points may be determined as lost circulation, so that the length of the lost circulation section is the product of the number of the detection points and 1m, and the length of the lost circulation section can be finally calculated.
In the above, the average speed of the drilling fluid in the lost circulation section leaking to the stratum can be calculated, and the average speed is compared with the lost circulation strength standard value to determine the loss strength of the lost circulation section. Wherein, the average speed of the drilling fluid lost to the stratum is calculated by the following formula:
wherein the content of the first and second substances,
the average speed of the drilling fluid in the lost circulation section to the stratum is shown;
detecting second gamma value detection points for each well depth in the lost circulation sectionAn average of the values;
the average value of the detection values of the first gamma value detection points at each well depth in the lost circulation section is obtained;representing the average of the time from the first gamma value detection point to the second gamma value detection point of each well depth in the lost circulation section to reach the well depth, α being the volume conversion factor of the gamma value of the drilling fluid containing the radioactive indicator with the current concentration
For example, when it is determined that a lost circulation exists in the first well depth, the second well depth, the third well depth and the fourth well depth which are continuous and increase in depth. The lost circulation segment is the location from the first well depth to the fourth well depth. The time T from the first gamma value detection point reaching the first well depth of the lost circulation section to the second gamma value detection point reaching the first well depth of the lost circulation section1The time T from the first gamma value detection point reaching the second well depth of the well leakage section to the second gamma value detection point reaching the second well depth of the well leakage section2The time T from the first gamma value detection point reaching the third well depth of the well leakage section to the second gamma value detection point reaching the third well depth of the well leakage section3And the time T from the first gamma value detection point reaching the fourth well depth of the lost circulation section to the second gamma value detection point reaching the fourth well depth of the lost circulation section4。
I.e. time T1、T2、T3And T4Average value of (T)1、T2、T3And T4Divided by 4).
The resulting average rate of loss of drilling fluid to the formation was compared to the standard values in the table below to determine the loss strength, wherein the loss strength rating table is shown in table 1.
TABLE 1 leakage Strength grading Table
In this embodiment, the method further includes calculating a drilling fluid loss while drilling position in the presence of the lost circulation after determining whether the lost circulation exists in the well depth, where the calculating the drilling fluid loss while drilling position may be calculated by the following formula:
Hk＝P-L，
wherein HkJudging the well depth with the well leakage for the first time; p is the well depth of the drill bit when the second gamma value detection point detects that the well leakage is abnormal; l is the distance from the drill bit to the second gamma value detection point. And L can be the distance from the drill bit to the second gamma value detection point set according to the actual situation on site before the well leakage detection.
In this embodiment, since the drilling fluid may be affected by lost circulation, surface manifold deposition, downhole drilling tool adhesion, and open channel loss of the drilling fluid flowing through the vibrating screen during the drilling process, the radioactive indicator added in the drilling fluid may be lost, which reduces the detected effect and may affect the data analysis and application of the subsequent steps. Thus, the indicator concentration in the drilling fluid is detected and replenished during or after drilling is complete to ensure that the indicator concentration in the drilling fluid reaches a minimum concentration value detectable at the detection point.
The volume percent concentration of the radioactive indicator can be detected and timely replenished under the following conditions: (1) at the completion of 30 or more cycle weeks; (2) before and after the drilling fluid is treated; (3) deviation of more than 20% occurs between the reading of the instrument and manual counting; (4) situations occur where a large scale oil and gas water leak display occurs, including drilling fluid lost circulation.
If quantitative dosing of the indicator additive is required without test and detection conditions, the dosage of the additive per liter of drilling fluid can be determined by testing. According to the difference requirement of the radioactive indicator and the stratum to be detected, the adding amount of the radioactive indicator can be determined according to stratum characteristics, additive difference conditions and the volume condition of a well casing in the drilling process. If a radioactive indicator with the mass concentration of 100Mg/L is required to be added, the total mass Mg of the well bore is 100 XU which is 100Umg, wherein U is the total volume of the well drilling fluid circulated underground and pumped on the surface.
In this embodiment, the detection ranges of the second gamma detection point and the first gamma detection point may be the content change of the indicator additive in the outer annular space between the outside of the drilling tool and the cutting surface of the formation exposed after being crushed by the drill bit and the formation with the depth of 30 cm (e.g. 20 cm) (radioactivity).
In this embodiment, the method for actively detecting the lost circulation is suitable for determining the lost circulation condition of the formation being drilled and actively detecting the condition that the drilling fluid is lost while drilling and enters the formation.
In this embodiment, the time of the well leakage occurring at the depth of the well to be detected should be later than the time of the first gamma value detection point reaching the depth of the well to be detected.
In this embodiment, if the clay content of the formation to be detected is abnormally increased, the rising slopes of the curves drawn by the detection values of the detection points in the whole detection process are all fluctuated and smooth, and the data detected by the second gamma value detection points are consistent with the change slope of the data curve detected by the first gamma value detection points.
In this embodiment, the method may further include determining a leak of a drilling formation or a leak-once formation after determining whether a leak exists deep in the well to be detected, and the determining method may include: if the well depth to be detected judges that the well leakage exists, the well leakage occurs on the positive drilling layer; and if the well depth to be detected is judged to have no leakage but the drilling fluid is reduced, judging that the leakage layer is leaked again.
In addition, steps S01 and S02 in the present invention are not sequential, and may be performed simultaneously.
In conclusion, the active near-bit while drilling real-time detection is adopted, the finding 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 finding time, and the finding and detecting speed is higher. The radioactive indicator with quantitative and volume percentage concentration is added into the drilling fluid, the position of the lost circulation and the strength of the lost circulation are traced and judged through the maintaining and loss conditions of the indicator in a drilling fluid circulation while drilling system, and the lost circulation detection speed is higher when the delay time is zero long at the detection position because the detection position is close to a drill bit. The invention can discover and detect according to the physical and chemical property changes of the drilling fluid and the indicator, has small time difference between the detection counting time and the detected lost circulation event, and is more direct and accurate in measurement.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for actively detecting lost circulation using radioactive indicators, the method comprising the steps of:
adding a predetermined content of radioactive indicator into the drilling fluid while drilling;
sequentially arranging a first gamma value detection point and a second gamma value detection point at the near-bit end of the drilling tool along the opposite drilling direction;
the method comprises the steps that a first gamma value detection point and a second gamma value detection point respectively detect gamma values of radioactive indicators at different well depths in a stratum to be detected, and whether well leakage exists at the well depths is judged according to the change condition of the first gamma value detection point and the second gamma value detection point at the same well depth detection value.
2. The method for actively detecting lost circulation using radioactive indicators as claimed in claim 1, further comprising calculating a location of loss of drilling fluid while drilling in the presence of lost circulation after determining whether there is lost circulation at the well depth, wherein the calculated location of loss of drilling fluid while drilling is calculated by the following formula:
Hk＝P-L，
wherein HkJudging the well depth with the well leakage for the first time; p is the well depth of the drill bit when the second gamma value detection point detects that the well leakage is abnormal; l is the distance from the drill bit to the second gamma value detection point.
3. The method for actively detecting lost circulation using radioactive indicator according to claim 1 or 2, wherein said determining whether there is lost circulation at the well depth is determined by the following formula:
comparison DeWith a threshold value delta, if DeIf the well depth is less than or equal to delta, judging that no well leakage exists in the well depth,
if D iseIf the well depth is larger than delta, the well leakage exists at the well depth, wherein GR1For the first gamma detection point at the well depth, GR2The detection value of the second gamma value detection point at the well depth is shown, and the threshold value delta is a given value.
4. The method of claim 1 or 2, wherein the determining whether the lost circulation exists at the well depth comprises:
the first gamma value detection point and the second gamma value detection point reach the well depth in sequence and detect the gamma value of the radioactive indicator at the well depth to obtain a first detection value and a second detection value, the first detection value and the second detection value are compared,
if the first detection value is equal to or approximately equal to the second detection value, judging that no well leakage occurs at the well depth;
if the first detection value is smaller than the second detection value, the suspected well leakage of the well depth is judged, the average speed of the well depth drilling fluid leaking to the stratum is calculated, and if the average speed is larger than the standard well leakage value, the suspected well leakage of the well depth is judged.
5. The method of claim 4, wherein the rate of loss of the drilling fluid to the formation is calculated by the following equation:
wherein Q is the speed of the drilling fluid lost to the stratum at the well depth; GR1Representing a first detection value; GR2Representing a second detected value, t representing the time elapsed from the first gamma value detection point to the second gamma value detection point reaching the well depth, α being the volume conversion factor for the gamma value of the drilling fluid containing the radioactive indicator at the current concentration.
6. The method of actively detecting lost circulation using radioactive indicators according to claim 1 or 2, further comprising determining a lost circulation segment length based on lost circulation decisions at different depths in the well, wherein determining the lost circulation segment length comprises:
setting the interval length between detection well depths in the drilling process while drilling;
and judging the conditions of the well leakage according to the well leakage of each well depth, if the well leakage exists in a plurality of continuous well depths, the length of the well leakage section is the sum of the interval lengths among the well depths in the continuous well depths.
7. The method of claim 6, further comprising comparing the average rate of fluid loss to the formation of the lost circulation segment to a lost circulation strength criterion to determine a lost circulation strength, wherein the average rate of fluid loss to the formation is calculated by the following equation:
wherein the content of the first and second substances,
for the lost circulation of drilling fluid to the groundAverage velocity of the layer;
the average value of the detection values of the second gamma value detection points at each well depth in the lost circulation section is obtained;
the average value of the detection values of the first gamma value detection points at each well depth in the lost circulation section is obtained;representing the average value of the time from the first gamma value detection point to the second gamma value detection point of each well depth in the lost circulation section to reach the well depth, and α is the volume conversion coefficient of the gamma value of the drilling fluid containing the radioactive indicator with the current concentration.
8. The method for actively detecting lost circulation using a radioactive indicator according to claim 1 or 2, wherein the radioactive indicator has a coefficient of difference from the formation of more than 0.2, wherein,
wherein D isgRepresenting the coefficient of difference, G, of the radioactive indicator from the formationtRepresents the natural radioactivity of the radioactive indicator; gdRepresenting the average of the natural radioactivity of the formation.
9. The method for actively detecting lost circulation using radioactive indicators as claimed in claim 1 or 2, wherein the method further comprises detecting the concentration of radioactive indicators in the drilling fluid during or after completion of drilling and supplementing the radioactive indicators to ensure that the concentration of indicators in the drilling fluid can reach above the minimum concentration value detectable at the detection point.
10. The method for actively detecting lost circulation using radioactive indicators as claimed in claim 1 or 2, wherein the method further comprises determining the type and concentration of the radioactive indicators added according to the formation properties before adding the predetermined content of radioactive indicators to the drilling fluid while drilling.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019106716291 | 2019-07-24 | ||
| CN201910671629.1A CN110454151A (en) | 2019-07-24 | 2019-07-24 | Active detection method for condition that drilling fluid leaks and enters stratum while drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110847897A true CN110847897A (en) | 2020-02-28 |
| CN110847897B CN110847897B (en) | 2022-09-27 |
Family
ID=68483300
Family Applications (9)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910671629.1A Pending CN110454151A (en) | 2019-07-24 | 2019-07-24 | Active detection method for condition that drilling fluid leaks and enters stratum while drilling |
| CN201911398328.2A Active CN110847897B (en) | 2019-07-24 | 2019-12-30 | Method for actively detecting lost circulation by using radioactive indicator |
| CN201911398164.3A Active CN110905487B (en) | 2019-07-24 | 2019-12-30 | High-accuracy well leakage active comprehensive detection method |
| CN201911397357.7A Active CN110905486B (en) | 2019-07-24 | 2019-12-30 | Method for detecting lost circulation while drilling by using high-conductivity indicating additive |
| CN201911398002.XA Active CN110847896B (en) | 2019-07-24 | 2019-12-30 | Active detection method for lost circulation while drilling 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 |
| CN201911403339.5A Active CN110872948B (en) | 2019-07-24 | 2019-12-30 | System for actively detecting lost circulation by utilizing radioactive indicator |
| CN201911396906.9A Active CN110863820B (en) | 2019-07-24 | 2019-12-30 | System for detecting lost circulation while drilling by adopting conductive indicating additive |
| CN201911397888.6A Active CN110924938B (en) | 2019-07-24 | 2019-12-30 | Well leakage while drilling active detection system with high accuracy |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910671629.1A Pending CN110454151A (en) | 2019-07-24 | 2019-07-24 | Active detection method for condition that drilling fluid leaks and enters stratum while drilling |
Family Applications After (7)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911398164.3A Active CN110905487B (en) | 2019-07-24 | 2019-12-30 | High-accuracy well leakage active comprehensive detection method |
| CN201911397357.7A Active CN110905486B (en) | 2019-07-24 | 2019-12-30 | Method for detecting lost circulation while drilling by using high-conductivity indicating additive |
| CN201911398002.XA Active CN110847896B (en) | 2019-07-24 | 2019-12-30 | Active detection method for lost circulation while drilling 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 |
| CN201911403339.5A Active CN110872948B (en) | 2019-07-24 | 2019-12-30 | System for actively detecting lost circulation by utilizing radioactive indicator |
| CN201911396906.9A Active CN110863820B (en) | 2019-07-24 | 2019-12-30 | System for detecting lost circulation while drilling by adopting conductive indicating additive |
| CN201911397888.6A Active CN110924938B (en) | 2019-07-24 | 2019-12-30 | Well leakage while drilling active detection system with high accuracy |
Country Status (1)
| Country | Link |
|---|---|
| CN (9) | CN110454151A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211619B (en) * | 2020-11-19 | 2024-06-28 | 中国石油天然气集团有限公司 | Method for quickly determining lost circulation position of 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 |
Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2588210A (en) * | 1949-11-18 | 1952-03-04 | Gulf Research Development Co | Method of locating leaks in well bores |
| AU5098573A (en) * | 1973-01-11 | 1974-07-11 | Randell Vann Roy | Method and apparatus for determining communication ofa perforated zone witha second zone |
| US4861986A (en) * | 1988-03-07 | 1989-08-29 | Halliburton Logging Services, Inc. | Tracer injection method |
| CN1167871A (en) * | 1997-05-07 | 1997-12-17 | 石油大学(北京) | Method and apparatus for measuring position of mud loss |
| US20020059028A1 (en) * | 2000-03-31 | 2002-05-16 | Rozak Alexander T. | Method for determining geologic formation fracture porosity using geophysical logs |
| CN1416500A (en) * | 2000-02-04 | 2003-05-07 | 施蓝姆伯格技术公司 | Method and appts. for monitoring advance of seawater into fresh water aquifers near coastal cities |
| US20080156977A1 (en) * | 2006-12-23 | 2008-07-03 | Schlumberger Technology Corporation | Methods and systems for determining mud flow velocity from measurement of an amplitude of an artificially induced radiation |
| US20110139443A1 (en) * | 2009-12-16 | 2011-06-16 | Schlumberger Technology Corporation | Monitoring fluid movement in a formation |
| US20120043459A1 (en) * | 2010-08-20 | 2012-02-23 | Baker Hughes Incorporated | Using lwt service to identify loss circulation areas in a wellbore |
| US20130160998A1 (en) * | 2011-12-23 | 2013-06-27 | Francois M. Auzerais | Lost Circulation Materials and Methods of Using Same |
| US20130299241A1 (en) * | 2012-05-10 | 2013-11-14 | Bp Exploration Operating Company Limited | Prediction and diagnosis of lost circulation in wells |
| WO2013169256A1 (en) * | 2012-05-10 | 2013-11-14 | Bp Corporation North America Inc. | Prediction and diagnosis of lost circulation in wells |
| CN104612669A (en) * | 2015-02-02 | 2015-05-13 | 中国石油集团渤海钻探工程有限公司 | Shaft leakage detecting device used for continuous coiled tube drilling |
| CN106285646A (en) * | 2016-09-09 | 2017-01-04 | 中国石油大学(华东) | Drilling well loss horizon recognition methods based on Multi-information acquisition |
| US20170176228A1 (en) * | 2015-12-22 | 2017-06-22 | Schlumberger Technology Corporation | Drilling fluid loss rate prediction |
| US20170183955A1 (en) * | 2014-06-09 | 2017-06-29 | WellTracer Technology, LLC | Gas Lift Analysis and Troubleshooting |
| US9823384B1 (en) * | 2016-08-26 | 2017-11-21 | Schlumberger Technology Corporation | Mud activation measurement while drilling |
| US20170370211A1 (en) * | 2015-02-27 | 2017-12-28 | Halliburton Energy Services, Inc. | Determining Drilling Fluid Loss In A Wellbore |
| CN108729868A (en) * | 2018-05-25 | 2018-11-02 | 中国海洋石油集团有限公司 | A kind of deep sea drilling overflow and leakage monitoring method |
| US20180371897A1 (en) * | 2017-05-25 | 2018-12-27 | Halliburton Energy Services, Inc. | Systems and methods to use triangulation through one sensor beamforming in downhole leak detection |
| WO2019137908A1 (en) * | 2018-01-10 | 2019-07-18 | Shell Internationale Research Maatschappij B.V. | Apparatus and method for downhole measurement |
| US20190226324A1 (en) * | 2016-12-07 | 2019-07-25 | Halliburton Energy Services, Inc. | Downhole leak monitor system |
| CN110249021A (en) * | 2017-03-03 | 2019-09-17 | 哈利伯顿能源服务公司 | Add the drilling fluid additive of chemical tags |
-
2019
- 2019-07-24 CN CN201910671629.1A patent/CN110454151A/en active Pending
- 2019-12-30 CN CN201911398328.2A patent/CN110847897B/en active Active
- 2019-12-30 CN CN201911398164.3A patent/CN110905487B/en active Active
- 2019-12-30 CN CN201911397357.7A patent/CN110905486B/en active Active
- 2019-12-30 CN CN201911398002.XA patent/CN110847896B/en active Active
- 2019-12-30 CN CN201911397085.0A patent/CN110863821B/en active Active
- 2019-12-30 CN CN201911403339.5A patent/CN110872948B/en active Active
- 2019-12-30 CN CN201911396906.9A patent/CN110863820B/en active Active
- 2019-12-30 CN CN201911397888.6A patent/CN110924938B/en active Active
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2588210A (en) * | 1949-11-18 | 1952-03-04 | Gulf Research Development Co | Method of locating leaks in well bores |
| AU5098573A (en) * | 1973-01-11 | 1974-07-11 | Randell Vann Roy | Method and apparatus for determining communication ofa perforated zone witha second zone |
| US4861986A (en) * | 1988-03-07 | 1989-08-29 | Halliburton Logging Services, Inc. | Tracer injection method |
| CN1167871A (en) * | 1997-05-07 | 1997-12-17 | 石油大学(北京) | Method and apparatus for measuring position of mud loss |
| CN1416500A (en) * | 2000-02-04 | 2003-05-07 | 施蓝姆伯格技术公司 | Method and appts. for monitoring advance of seawater into fresh water aquifers near coastal cities |
| US20020059028A1 (en) * | 2000-03-31 | 2002-05-16 | Rozak Alexander T. | Method for determining geologic formation fracture porosity using geophysical logs |
| US20080156977A1 (en) * | 2006-12-23 | 2008-07-03 | Schlumberger Technology Corporation | Methods and systems for determining mud flow velocity from measurement of an amplitude of an artificially induced radiation |
| US20110139443A1 (en) * | 2009-12-16 | 2011-06-16 | Schlumberger Technology Corporation | Monitoring fluid movement in a formation |
| US20120043459A1 (en) * | 2010-08-20 | 2012-02-23 | Baker Hughes Incorporated | Using lwt service to identify loss circulation areas in a wellbore |
| US20130160998A1 (en) * | 2011-12-23 | 2013-06-27 | Francois M. Auzerais | Lost Circulation Materials and Methods of Using Same |
| US20130299241A1 (en) * | 2012-05-10 | 2013-11-14 | Bp Exploration Operating Company Limited | Prediction and diagnosis of lost circulation in wells |
| WO2013169256A1 (en) * | 2012-05-10 | 2013-11-14 | Bp Corporation North America Inc. | Prediction and diagnosis of lost circulation in wells |
| US20170183955A1 (en) * | 2014-06-09 | 2017-06-29 | WellTracer Technology, LLC | Gas Lift Analysis and Troubleshooting |
| CN104612669A (en) * | 2015-02-02 | 2015-05-13 | 中国石油集团渤海钻探工程有限公司 | Shaft leakage detecting device used for continuous coiled tube drilling |
| US20170370211A1 (en) * | 2015-02-27 | 2017-12-28 | Halliburton Energy Services, Inc. | Determining Drilling Fluid Loss In A Wellbore |
| US20170176228A1 (en) * | 2015-12-22 | 2017-06-22 | Schlumberger Technology Corporation | Drilling fluid loss rate prediction |
| US9823384B1 (en) * | 2016-08-26 | 2017-11-21 | Schlumberger Technology Corporation | Mud activation measurement while drilling |
| CN106285646A (en) * | 2016-09-09 | 2017-01-04 | 中国石油大学(华东) | Drilling well loss horizon recognition methods based on Multi-information acquisition |
| US20190226324A1 (en) * | 2016-12-07 | 2019-07-25 | Halliburton Energy Services, Inc. | Downhole leak monitor system |
| CN110249021A (en) * | 2017-03-03 | 2019-09-17 | 哈利伯顿能源服务公司 | Add the drilling fluid additive of chemical tags |
| US20180371897A1 (en) * | 2017-05-25 | 2018-12-27 | Halliburton Energy Services, Inc. | Systems and methods to use triangulation through one sensor beamforming in downhole leak detection |
| WO2019137908A1 (en) * | 2018-01-10 | 2019-07-18 | Shell Internationale Research Maatschappij B.V. | Apparatus and method for downhole measurement |
| CN108729868A (en) * | 2018-05-25 | 2018-11-02 | 中国海洋石油集团有限公司 | A kind of deep sea drilling overflow and leakage monitoring method |
Non-Patent Citations (2)
| Title |
|---|
| 孙传友: "漏层位置的仪器测定法", 《石油仪器》 * |
| 范翔宇等: "基于测井资料确定钻井液漏失层位的方法研究", 《天然气工业》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110847896B (en) | 2022-10-14 |
| CN110905486B (en) | 2022-09-27 |
| CN110905487A (en) | 2020-03-24 |
| CN110863821A (en) | 2020-03-06 |
| CN110863820B (en) | 2022-09-27 |
| CN110872948A (en) | 2020-03-10 |
| CN110905486A (en) | 2020-03-24 |
| CN110847897B (en) | 2022-09-27 |
| CN110872948B (en) | 2022-10-25 |
| CN110905487B (en) | 2022-10-14 |
| CN110847896A (en) | 2020-02-28 |
| CN110924938A (en) | 2020-03-27 |
| CN110454151A (en) | 2019-11-15 |
| CN110863820A (en) | 2020-03-06 |
| CN110863821B (en) | 2022-09-27 |
| CN110924938B (en) | 2022-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110847897B (en) | Method for actively detecting lost circulation by using radioactive indicator | |
| CN113820078B (en) | Method for detecting dam leakage by combining tracing method and dilution concentration method | |
| CN112069737B (en) | Low-permeability reservoir CO 2 Method and device for predicting gas channeling time of miscible flooding affected oil well | |
| Akbari et al. | A critical review of concept and methods related to accessible pore volume during polymer-enhanced oil recovery | |
| CA3053194C (en) | Systems and methods for monitoring casing cement integrity | |
| CN116150695A (en) | Drilling fluid leakage position determination and leakage parameter calculation method | |
| US10060258B2 (en) | Systems and methods for optimizing analysis of subterranean well bores and fluids using noble gases | |
| Wei et al. | An Evaluation of Pressure Control Methods During Riser Gas Handling with MPD Equipment Based on Transient Multiphase Flow Modeling and Distributed Fiber Optic Sensing | |
| US10753203B2 (en) | Systems and methods to identify and inhibit spider web borehole failure in hydrocarbon wells | |
| Gravdal | Real-time evaluation of kick during managed pressure drilling based on wired drill pipe telemetry | |
| Eghbal et al. | Production analysis PA and application of rate transient analysis RTA in carbonate oil reservoirs for reservoir characterization and connectivity | |
| CN114320265A (en) | Well leakage early detection method based on underground engineering parameter measurement | |
| CN114427444A (en) | Bottom hole pressure prediction method for oil production well in flowing period | |
| Yu et al. | Identification of the location of the leakage layer under the condition of coexistence of circulation leakage and blowout: A case study of a block in the Bohai Sea | |
| CN109386282B (en) | Identification method for drilling oil layer under mixed oil drilling fluid condition | |
| Che et al. | An Integrated Governance Technology Based on Magnetic Steering System for Cementing Plug in Open-Hole Section of Underground Gas Storage: Theoretical Analysis and Field Test | |
| CN117272573A (en) | Method for calculating saturation of water-flooding residual oil by neutron density superposition method | |
| CN118226549A (en) | Sandstone reservoir fluid interpretation method, sandstone reservoir fluid interpretation device, sandstone reservoir fluid interpretation medium and electronic equipment | |
| Gauthier et al. | Determination of Water–Producing Zones While Underbalanced Drilling Horizontal Wells—Integration of Sigma Log and Real–Time Production Data | |
| CN115841008A (en) | Method and system for calculating fluid parameters of thick-layer light oil reservoir | |
| CN113107464A (en) | Horizontal well stepping type flooded layer identification logging method | |
| Firouz et al. | Applicability of New Production Logging Tools in Horizontal and Deviated Wells of One of Iranian Fields | |
| Pöllänen | Difference flow and electrical conductivity measurements at the Olkiluoto site in Eurajoki, drillholes OL-PP66-OL-PP69 | |
| Li et al. | Study on pressure measuring and formation evaluation methods while underbalanced drilling | |
| Zhao et al. | A Method for Identifying Channeling Paths in Low-Permeability Fractured Reservoirs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |