CN114183073A - Geological guiding method for horizontal well of in-situ leaching sandstone type uranium deposit - Google Patents
Geological guiding method for horizontal well of in-situ leaching sandstone type uranium deposit Download PDFInfo
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- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 37
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 22
- 238000002386 leaching Methods 0.000 title claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 230000015572 biosynthetic process Effects 0.000 claims description 28
- 238000005755 formation reaction Methods 0.000 claims description 28
- 238000013461 design Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 244000273928 Zingiber officinale Species 0.000 description 1
- 235000006886 Zingiber officinale Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 235000008397 ginger Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 239000001841 zingiber officinale Substances 0.000 description 1
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- 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
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a geosteering method for an in-situ leaching sandstone type uranium ore horizontal well, which is characterized by comprising the following steps of: reconstructing a target layer according to the interpretation of the actual drilling data, and accurately judging the drilling-in and drilling-out of the target reservoir layer of the well track; determining the actual position of the drill bit in the target layer; and accurately judging the drilling-in and drilling-out trend of the drill bit in the target layer, and guiding the field geological steering. According to the method, the geological steering of the site-directed sandstone-immersed uranium ore horizontal well is improved, and the identification method is simple in steps, easy to operate and effective; the problem of reliable running of the drill bit of the ground leaching sandstone type uranium ore horizontal well in the horizontal section can be effectively solved, and the well forming quality is improved.
Description
Technical Field
The invention relates to the technical field of drilling of in-situ leaching sandstone type uranium ores, in particular to a geological steering method for a horizontal well of in-situ leaching sandstone type uranium ores.
Background
With the rapid development of economy and the increasing demand for energy, such problems have been presented in a more serious situation. Uranium and compounds thereof are important raw materials indispensable to nuclear energy utilization, and the shortage of uranium ore resources is becoming a restriction on the development of nuclear power in China. Drilling is one of the main technical means in the uranium deposit exploration process, and the development level of the drilling technology of the geospatial type uranium deposit directly influences the geological prospecting result, the deposit exploration efficiency, the exploration cost and the like of the geospatial type uranium deposit (Liu Xiao Yang et al, 2021 years). The continuous increase of sandstone uranium ore drilling workload and the adjustment of new horizon, new region, new type and new depth ore finding ideas put forward new requirements on an in-situ sandstone type uranium ore drilling process and equipment, and the in-situ sandstone type uranium ore drilling technology and construction equipment are required to be further upgraded and updated (Zingiber officinale and the like in 2011) so as to improve the drilling technical level and the production efficiency, meet the requirements of high-efficiency, safety and green development and provide technical support for uranium ore exploration work at a new situation.
At present, sandstone-dipped uranium ores in northern areas of China are mined by adopting a vertical well, the contact area of a conventional vertical well and an ore bed section is small, and the single-well control area is small. The investment of the dense vertical well in the aspect of drilling in mine construction is higher in proportion in the construction, and can reach 50% -80%, the drilling cost is about 75% of the drilling material and labor cost, and the investment return rate is low. In order to solve the problems of high mining cost and low production efficiency in the prior art, the horizontal well process is applied to the sandstone-dipped uranium ore in the northern area, so that the production efficiency is expected to be greatly improved, and the mining cost is reduced. The drill bit needs to be guided during the exploitation of the in-situ leaching sandstone type uranium ore horizontal well, and the prior art cannot provide reliable guidance for the exploitation of the in-situ leaching sandstone type uranium ore horizontal well.
Disclosure of Invention
The invention aims to provide a geosteering method for an in-situ leaching sandstone type uranium ore horizontal well, aiming at the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a geosteering method for horizontal wells of in-situ leaching sandstone-type uranium mines comprises the following steps:
reconstructing a target layer according to the interpretation of the actual drilling data, and accurately judging the drilling-in and drilling-out of the target reservoir layer of the well track;
and determining the actual position of the drill bit in the target layer, accurately judging the drilling-in and drilling-out trend of the drill bit in the target layer, and guiding the field geological steering.
Further, reconstructing the target layer comprises the following steps:
A. collecting production data and data of geological design, engineering design, earthquake, geology, well logging and adjacent wells, and performing sorting analysis; carrying out stratum division on a target layer, and determining a comparison mark layer;
B. defining a logging curve mark point, analyzing the change characteristic of the logging curve in a logging-while-drilling curve graph, defining the position with obvious change characteristic as the logging curve mark point, manufacturing a mark point statistical table, wherein the mark point statistical table comprises two columns of mark point serial numbers and depth measurement, and recording the logging curve mark point data into the mark point statistical table;
C. defining symmetrical mark points, analyzing all the log curve mark points according to the characteristic that log curves at the same position of the same stratum have similarity, finding out two log curve mark points with similar log curve values and symmetrical change trends, defining the two log curve mark points as symmetrical mark points, wherein the second log curve mark point is a repeated point of the first log curve mark point at the same position of the stratum, and so on, and defining other symmetrical mark points;
D. making a formation parallel line, wherein a pair of symmetrical marking points pass through a section of a borehole trajectory from a first logging curve marking point to a second logging curve marking point, the head and the tail of the section are connected on a borehole trajectory sectional view, and a connecting line is the formation parallel line; connecting each pair of symmetrical mark points to pass through one section of the well track to obtain a stratum parallel line;
E. determining the inclination angle of each section of stratum and the change trend of the inclination angle of the stratum;
F. making a stratum parallel line inclination angle statistical table, wherein the stratum parallel line inclination angle statistical table comprises two columns of symmetrical mark points and stratum parallel line inclination angles corresponding to stratum parallel lines, and recording the stratum parallel line inclination angle data into the stratum parallel line inclination angle statistical table;
G. in some formations, when a drill bit drills from the top of the formation and then drills from the bottom or drills from the bottom and then drills from the top, the logging while drilling curve has certain symmetry, so that the made formation parallel lines are not parallel to the formation, and unreasonable formation parallel lines are filtered;
H. the dip angles of the residual stratum parallel lines after filtration determine the average dip angle of the stratum at the section where the stratum parallel lines are located, and the dip angle change of the adjacent stratum parallel lines determines the stratum dip angle change trend;
I. and determining the drilling points of the top boundary and the bottom boundary of the target layer according to the variation trend of the natural gamma detection value and the depth lateral resistivity value in the logging curve graph and the threshold value thereof and by combining the interpretation result of the marking point interpretation table.
The method comprises the following steps of determining the actual position of a drill bit in a target layer, accurately judging the drilling-in and drilling-out trend of the drill bit in the target layer, and guiding field geosteering, wherein the method comprises the following steps:
(1) when the drill bit is positioned in a target layer, if the geological design requires, the well track is positioned at the position in the target layer required in the design book, if the geological design does not require, the well track is positioned at the best position displayed by the sandstone of the target layer, and then the inclination angle of the well is kept consistent with the inclination angle of the stratum, so that the drilling is carried out stably; (2) when the drill bit is above the target layer, the drill bit is oriented downwards to return the drill bit to the target layer; (3) when the bit is below the formation, the bit is oriented upward, returning the bit to the formation.
And E, reflecting that the drill bit drills from a stratum and then drills back to the same stratum through the symmetrical mark points at the two ends of the stratum parallel lines, and determining that the inclination angle of the stratum parallel lines is consistent with the average value of the inclination angles of the stratum.
In step G, the unreasonable stratum parallel line filtering method is as follows: (1) comparing the stratum parallel lines with a geological structure diagram of a design book, and filtering the stratum parallel lines if the geological interpretation is obviously violated; (2) comparing the stratigraphic parallel lines with the seismic profile, and filtering the stratigraphic parallel lines if the explanation of the earthquake is violated obviously; (3) the lithology of the upper part of the target stratum is different from that of the lower part of the target stratum, the field logging information is used for comparison, and if the illegal logging explanation is obvious, the parallel lines of the stratum are filtered.
The invention provides a geosteering method for an in-situ leaching sandstone type uranium ore horizontal well, which has the following beneficial effects:
1) accurately judging the drilling-in and drilling-out of a target reservoir by reconstructing the target reservoir; according to the actual position of the drill bit in the target layer, the drilling-in and drilling-out trend of the drill bit in the target layer is accurately judged, the field geological guide is guided, the field-guided sandstone-immersed uranium ore horizontal well geological guide is improved, and the judging and identifying method is simple in steps, easy to operate and effective;
2) the problem of reliable running of the drill bit of the ground leaching sandstone type uranium ore horizontal well in the horizontal section can be effectively solved, and the well forming quality is improved.
Drawings
Fig. 1 is a schematic diagram of a borehole trajectory of horizontal well geosteering of an in-situ leaching sandstone type uranium mine provided by the invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problems of high mining cost and low production efficiency in the prior art, the horizontal well process is applied to the sandstone-dipped uranium ore in the northern area, so that the production efficiency is expected to be greatly improved, and the mining cost is reduced. At present, a horizontal well process is not applied to the exploitation of northern sandstone-leaching type uranium ores on a large scale. In 2019 and 2020, a horizontal well process test is carried out in Xinjiang Lanka, and a horizontal well with a horizontal section length of about 200m is constructed. In the process of horizontal well exploitation, a rotary geosteering drilling technology is applied in one mode, the rotary geosteering drilling technology is mainly realized by means of a rotary steerable drilling system, and efficient drilling is realized by rotary drilling of a drill column and needing a steering function. And (3) drilling by utilizing deflecting directional drilling and drilling by utilizing a downhole motor matched with a bent joint. Meanwhile, the novel directional drilling technology of directional drilling by using a steering motor is utilized. The invention provides a geosteering method for an in-situ leaching sandstone type uranium ore horizontal well, which is used for geosteering the in-situ leaching sandstone type uranium ore horizontal well.
The invention provides a geosteering method for an in-situ leaching sandstone type uranium ore horizontal well, which is used for geosteering the in-situ leaching sandstone type uranium ore horizontal well and comprises the following steps:
A. collecting production data and data of geological design, engineering design, earthquake, geology, well logging and adjacent wells, and performing sorting analysis; carrying out stratum division on a target layer, and determining a comparison mark layer;
B. defining a logging curve mark point, analyzing the change characteristic of the logging curve in a logging-while-drilling curve graph, defining the position with obvious change characteristic as the logging curve mark point, manufacturing a mark point statistical table, wherein the mark point statistical table comprises two columns of mark point serial numbers and depth measurement, and recording the logging curve mark point data into a mark point statistical table (table 1);
TABLE 1
| Mark point (sequence number) | Depth sounding (m) |
| A | |
| B | |
| … |
C. Defining symmetrical mark points, analyzing all the log curve mark points according to the characteristic that log curves at the same position of the same stratum have similarity, finding out two log curve mark points with similar log curve values and symmetrical change trends, defining the two log curve mark points as symmetrical mark points, wherein the second log curve mark point is a repeated point of the first log curve mark point at the same position of the stratum, and so on, and defining other symmetrical mark points;
D. making a formation parallel line, wherein a pair of symmetrical marking points pass through a section of a borehole trajectory from a first logging curve marking point to a second logging curve marking point, the head and the tail of the section are connected on a borehole trajectory sectional view, and a connecting line is the formation parallel line; connecting each pair of symmetrical mark points to pass through one section of the well track to obtain a stratum parallel line;
E. determining the inclination angle of each section of stratum and the change trend of the inclination angle of the stratum; reflecting that the drill bit drills from a stratum and then drills back to the same stratum through symmetrical mark points at two ends of the stratum parallel line, and determining that the inclination angle of the stratum parallel line is consistent with the average value of the inclination angles of the stratum;
F. making a stratum parallel line inclination angle statistical table, wherein the stratum parallel line inclination angle statistical table comprises two columns of symmetrical mark points and stratum parallel line inclination angles corresponding to stratum parallel lines, and recording the stratum parallel line inclination angle data into the stratum parallel line inclination angle statistical table;
G. in some formations, when a drill bit drills from the top of the formation and then drills from the bottom or drills from the bottom and then drills from the top, the logging while drilling curve has certain symmetry, so that the made formation parallel lines are not parallel to the formation, and unreasonable formation parallel lines are filtered; unreasonable formation parallel line filtration methods are as follows: (1) comparing the stratum parallel lines with a geological structure diagram of a design book, and filtering out if a violation geological explanation is obvious; (2) comparing the stratum parallel lines with the seismic section diagram, and filtering out the stratum parallel lines if the explanation of the violation earthquake is obvious; (3) the lithology of the upper part of the target layer is different from that of the lower part, the on-site logging information is used for comparison, and if the logging interpretation is obviously violated, the filtering is carried out;
H. the dip angles of the residual stratum parallel lines after filtration determine the average dip angle of the stratum at the section where the stratum parallel lines are located, and the dip angle change of the adjacent stratum parallel lines determines the stratum dip angle change trend;
I. determining the drilling meeting points of the top boundary and the bottom boundary of the target layer, and determining the drilling meeting points of the top boundary and the bottom boundary of the target layer according to the variation trend of the natural gamma detection value and the depth lateral resistivity value in the logging curve graph and the threshold value thereof and by combining the interpretation result of the marking point interpretation table;
the interpretation of the actual drilling data is obtained through the steps to reconstruct a target layer, and the drilling of the well track into and out of the target reservoir layer is accurately judged;
therefore, the actual position of the drill bit in the target layer is determined, the drilling-in and drilling-out trend of the drill bit in the target layer is accurately judged, and the field geological guidance is guided according to the following operations: (1) when the drill bit is positioned in a target layer, if the geological design requires, the well track is positioned at the position in the target layer required in the design book, if the geological design does not require, the well track is positioned at the best position displayed by the sandstone of the target layer, and then the inclination angle of the well is kept consistent with the inclination angle of the stratum, so that the drilling is carried out stably; (2) when the drill bit is above the target layer, the drill bit is oriented downwards to return the drill bit to the target layer; (3) when the bit is below the formation, the bit is oriented upward, returning the bit to the formation.
A schematic diagram of the borehole trajectory detected by this embodiment is shown in fig. 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (5)
1. A geosteering method for a horizontal well of an in-situ leaching sandstone type uranium deposit is characterized by comprising the following steps: the method comprises the following steps:
reconstructing a target layer according to the interpretation of the actual drilling data, and accurately judging the drilling-in and drilling-out of the target reservoir layer of the well track;
determining the actual position of the drill bit in the target layer;
and accurately judging the drilling-in and drilling-out trend of the drill bit in the target layer, and guiding the field geological steering.
2. The method for geosteering a horizontal well of an in-situ sandstone-type uranium deposit according to claim 1, wherein: the target layer reconstruction method comprises the following steps:
A. collecting production data and data of geological design, engineering design, earthquake, geology, well logging and adjacent wells, and performing sorting analysis; carrying out stratum division on a target layer, and determining a comparison mark layer;
B. defining a logging curve mark point, analyzing the change characteristic of the logging curve in a logging-while-drilling curve graph, defining the position with obvious change characteristic as the logging curve mark point, manufacturing a mark point statistical table, wherein the mark point statistical table comprises two columns of mark point serial numbers and depth measurement, and recording the logging curve mark point data into the mark point statistical table;
C. defining symmetrical mark points, analyzing all the log curve mark points according to the characteristic that log curves at the same position of the same stratum have similarity, finding out two log curve mark points with similar log curve values and symmetrical change trends, defining the two log curve mark points as symmetrical mark points, wherein the second log curve mark point is a repeated point of the first log curve mark point at the same position of the stratum, and so on, and defining other symmetrical mark points;
D. making a formation parallel line, wherein a pair of symmetrical marking points pass through a section of a borehole trajectory from a first logging curve marking point to a second logging curve marking point, the head and the tail of the section are connected on a borehole trajectory sectional view, and a connecting line is the formation parallel line; connecting each pair of symmetrical mark points to pass through one section of the well track to obtain a stratum parallel line;
E. determining the inclination angle of each section of stratum and the change trend of the inclination angle of the stratum;
F. making a stratum parallel line inclination angle statistical table, wherein the stratum parallel line inclination angle statistical table comprises two columns of symmetrical mark points and stratum parallel line inclination angles corresponding to stratum parallel lines, and recording the stratum parallel line inclination angle data into the stratum parallel line inclination angle statistical table;
G. in some formations, when a drill bit drills from the top of the formation and then drills from the bottom or drills from the bottom and then drills from the top, the logging while drilling curve has certain symmetry, so that the made formation parallel lines are not parallel to the formation, and unreasonable formation parallel lines are filtered;
H. the dip angles of the residual stratum parallel lines after filtration determine the average dip angle of the stratum at the section where the stratum parallel lines are located, and the dip angle change of the adjacent stratum parallel lines determines the stratum dip angle change trend;
I. and determining the drilling points of the top boundary and the bottom boundary of the target layer according to the variation trend of the natural gamma detection value and the depth lateral resistivity value in the logging curve graph and the threshold value thereof and by combining the interpretation result of the marking point interpretation table.
3. The method for geosteering a horizontal well of an in-situ sandstone-type uranium deposit according to claim 1, wherein: the method comprises the following steps of determining the actual position of a drill bit in a target layer, accurately judging the drilling-in and drilling-out trend of the drill bit in the target layer, and guiding field geological guidance, wherein the method comprises the following steps:
(1) when the drill bit is positioned in a target layer, if the geological design requires, the well track is positioned at the position in the target layer required in the design book, if the geological design does not require, the well track is positioned at the best position displayed by the sandstone of the target layer, and then the inclination angle of the well is kept consistent with the inclination angle of the stratum, so that the drilling is carried out stably; (2) when the drill bit is above the target layer, the drill bit is oriented downwards to return the drill bit to the target layer; (3) when the bit is below the formation, the bit is oriented upward, returning the bit to the formation.
4. The method for geosteering a horizontal well of an in-situ sandstone-type uranium deposit according to claim 2, wherein: and E, reflecting that the drill bit drills from a stratum and then drills back to the same stratum through the symmetrical mark points at the two ends of the stratum parallel lines, and determining that the inclination angle of the stratum parallel lines is consistent with the average value of the inclination angles of the stratum.
5. The method for geosteering a horizontal well of an in-situ sandstone-type uranium deposit according to claim 2, wherein: in step G, the unreasonable stratum parallel line filtering method is as follows: (1) comparing the stratum parallel lines with a geological structure diagram of a design book, and filtering the stratum parallel lines if the geological interpretation is obviously violated; (2) comparing the stratigraphic parallel lines with the seismic profile, and filtering the stratigraphic parallel lines if the explanation of the earthquake is violated obviously; (3) the lithology of the upper part of the target stratum is different from that of the lower part of the target stratum, the field logging information is used for comparison, and if the illegal logging explanation is obvious, the parallel lines of the stratum are filtered.
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Citations (5)
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|---|---|---|---|---|
| CN102140889A (en) * | 2011-03-09 | 2011-08-03 | 邱世军 | Horizontal well logging while drilling geo-steering method |
| CN102162355A (en) * | 2011-03-09 | 2011-08-24 | 邱世军 | Geosteering method for landing horizontal well |
| CN108442882A (en) * | 2018-03-01 | 2018-08-24 | 中石化江汉石油工程有限公司 | Shale gas extended horizontal well based on 2-d seismic data is with brill geosteering method |
| CN111399048A (en) * | 2020-04-29 | 2020-07-10 | 四川杰瑞泰克科技有限公司 | Method for calculating correlation attribute and data weighted reconstruction of broken solution |
| RU2728000C1 (en) * | 2019-10-10 | 2020-07-28 | Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") | Method of guiding horizontal wellbore in target range of sedimentary rocks based on elemental analysis of slurry |
-
2021
- 2021-12-08 CN CN202111493510.3A patent/CN114183073A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102140889A (en) * | 2011-03-09 | 2011-08-03 | 邱世军 | Horizontal well logging while drilling geo-steering method |
| CN102162355A (en) * | 2011-03-09 | 2011-08-24 | 邱世军 | Geosteering method for landing horizontal well |
| CN108442882A (en) * | 2018-03-01 | 2018-08-24 | 中石化江汉石油工程有限公司 | Shale gas extended horizontal well based on 2-d seismic data is with brill geosteering method |
| RU2728000C1 (en) * | 2019-10-10 | 2020-07-28 | Общество с ограниченной ответственностью "ЛУКОЙЛ-Инжиниринг" (ООО "ЛУКОЙЛ-Инжиниринг") | Method of guiding horizontal wellbore in target range of sedimentary rocks based on elemental analysis of slurry |
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