CN113738345A - Method for judging drilling condition based on conventional while-drilling tool - Google Patents
Method for judging drilling condition based on conventional while-drilling tool Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims description 23
- 230000015572 biosynthetic process Effects 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 14
- 239000011435 rock Substances 0.000 claims description 10
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- 230000003631 expected effect Effects 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000009924 canning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004876 x-ray fluorescence Methods 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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
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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
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
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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
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while 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
- 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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- 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
- E21B49/02—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 by mechanically taking samples of the soil
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Abstract
The embodiment of the application discloses a method for judging a drilling condition based on a conventional while-drilling tool, and belongs to the technical field of drilling. The method comprises the following steps: acquiring first depth data; acquiring second depth data; determining that drilling conditions of the bottom hole assembly are expected where an absolute value of a difference between the first depth data and the second depth data is less than a threshold. According to the technical scheme, after the drilling condition of the bottom hole drilling assembly is predicted, the accuracy of the prediction result of the drilling condition can be judged, the operation is simple and convenient, the operation is easy to grasp, whether the inclination angle in the drilling process meets the expected effect can be quickly analyzed, the accuracy of the drilling track is ensured, and the drilling rate of the reservoir can be effectively ensured.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of shale gas geosteering, in particular to a method for judging drilling conditions based on a conventional while-drilling tool.
Background
In the drilling process of the shale gas reservoir horizontal well, due to objective factors of thin reservoir and complex and changeable underground structure, a geosteering technology is needed to analyze and convert measured data at the bottom of the well in real time into geological knowledge, and the drilling engineering track is accurately adjusted to improve the drilling rate of the reservoir.
In the related art, a combined form of a deflecting section rotating guide tool and a horizontal section conventional while drilling tool is widely adopted to predict the drilling condition of the while drilling tool. The distance between the data measuring point of the conventional drilling tool and the drill bit is about 13-18m (about 4m compared with a rotary steering tool), the track deflecting capacity and the prediction of the well deflection at the bottom of the well in the range of a long measuring blind area section at the bottom of the well need to be realized by the experience of engineering technicians, such as the prediction according to the track control condition (the sliding and composite drilling footage ratio, the well deflection change condition and the like) in the length distance from the last measuring point to the measuring point and the specific of a drilling tool assembly.
However, in the related art, since the drilling condition of the conventional drilling tool is predicted only according to the experience of the operator, the accuracy of the predicted drilling condition cannot be judged, so that deviation occurs in geosteering, and further, when a problem occurs in a well inclination angle in the drilling process, the deviation cannot be determined and solved in time.
Disclosure of Invention
The embodiment of the application provides a method for judging the drilling condition based on a conventional drilling tool, which can be used for quickly analyzing whether the inclination angle in the drilling process meets the expected effect or not and timely solving the problem in the drilling process. The technical scheme is as follows:
the embodiment of the application provides a method for judging drilling conditions, which comprises the following steps:
acquiring first depth data, wherein the first depth data is used for indicating drilling depth data corresponding to the bottommost end of a bottom hole assembly;
obtaining second depth data indicative of data obtained from measurement points of a conventional while drilling tool in the bottom hole assembly;
determining that drilling conditions of the bottom hole assembly are expected if an absolute value of a difference between the first depth data and the second depth data is less than a threshold.
In an exemplary embodiment, the acquiring the first depth data includes:
obtaining a bottom hole sample in the process of drilling the bottom hole assembly, wherein the bottom hole sample refers to a bottom hole rock debris sample;
analyzing the bottom hole sample by taking the block standard profile as a reference to obtain the first depth data;
the block standard profile is used for indicating element data contained in different depth positions of geological layers of a target area.
In an exemplary embodiment, analyzing the downhole sample based on a block standard profile to obtain the first depth data comprises:
analyzing the elemental data contained in the downhole sample;
determining the first depth data from data combining features contained in the bottom hole sample based on the block standard profile.
In an exemplary embodiment, the acquiring the second depth data includes:
acquiring measuring point information detected by measuring points of a conventional drilling tool on the bottom hole drilling tool assembly;
and acquiring the second depth data according to the measuring point information.
In an exemplary embodiment, the measurement point information includes first measurement point information and second measurement point information, the first measurement point information being information obtained when the measurement point is located at a first position, the second measurement point information being information obtained when the measurement point is located at a second position; the depth corresponding to the second position is greater than the depth corresponding to the first position by taking the drilling platform surface as a reference;
the obtaining of the second depth data according to the measuring point information includes:
and acquiring the second depth data according to the first measuring point information and the second measuring point information.
In an exemplary embodiment, the obtaining the second depth data according to the first measuring point information and the second measuring point information includes:
determining a vertical depth variation according to the first measuring point information, the second measuring point information and the blind area length of the bottom hole assembly, wherein the vertical depth variation is used for indicating vertical depth data corresponding to the bottommost position of the bottom hole assembly;
determining influence factors of the sectional formation dip angle according to the second measuring point information and the length of the blind zone of the bottom hole assembly;
determining the second data according to the vertical depth variation, the subsection stratum inclination angle influence factors and a standard well contrast deviation, wherein the standard well contrast deviation refers to an estimated deviation value aiming at the second depth data, which is obtained through standard well comparison;
wherein the dead zone length of the bottom hole assembly is the distance between the detection point and the bottommost end of the bottom hole assembly.
In an exemplary embodiment, the first station information comprises a first well angle, a first well depth and a first natural gamma value, and the second station information comprises a second well angle, a second well depth and a second natural gamma value; wherein the first natural gamma value is indicative of a geological feature of the first location and the second natural gamma value is indicative of a geological feature of the second location.
In an exemplary embodiment, the determining a change amount of a vertical depth from the first measuring point information and the second measuring point information includes:
determining a predicted inclination angle according to the first inclination angle, the first depth of hole, the second inclination angle and the second depth of hole, wherein the predicted inclination angle is used for indicating an inclination angle corresponding to the bottommost position of the bottom hole assembly;
and determining the vertical depth variation according to the predicted inclination angle, the second inclination angle and the blind zone length of the bottom hole assembly.
In an exemplary embodiment, the determining the influence factor of the section stratigraphic dip angle according to the second measuring point information comprises:
comparing the second well dip angle and the second natural gamma value to the reference well to determine a formation dip angle at the second location;
and determining the influence factors of the subsection stratum inclination angle according to the stratum inclination angle of the second position and the blind zone length of the bottom hole assembly.
In an exemplary embodiment, the method further comprises:
determining that drilling conditions of the bottom hole assembly are not expected if an absolute value of a difference between the first depth data and the second depth data is greater than the threshold;
modifying the drilling pattern of the bottom hole assembly, and re-executing from the step of obtaining the first depth data until an absolute value of a difference between the first depth data and the second depth data is less than a threshold value.
The beneficial effects brought by the technical scheme provided by the embodiment of the application can include:
whether the drilling condition is in accordance with expectation is determined through comparison of the first depth data and the second depth data, when the absolute value of the difference value between the first depth data and the second depth data is smaller than a threshold value, the fact that the drilling condition of the bottom hole assembly is in accordance with the expectation can be determined through personnel, namely after the drilling condition of the bottom hole assembly is predicted, accuracy judgment of the prediction result of the drilling condition can be achieved, the operation is simple and convenient, the grasping is easy, whether the inclination angle in the drilling process meets the expectation effect can be analyzed rapidly, the accuracy of the drilling track is guaranteed, and further the drilling rate of a reservoir can be effectively guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of determining drilling conditions provided by one embodiment of the present application;
FIG. 2 schematically illustrates a structure of a bottom hole assembly;
fig. 3 schematically shows a block standard cross section;
FIG. 4 is a schematic diagram illustrating an example manner of obtaining formation dip;
FIG. 5 is a schematic diagram illustrating the determination of whether drilling conditions are expected;
fig. 6 is a schematic diagram illustrating a flow of determination of drilling conditions.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of a method for determining a drilling condition according to an embodiment of the present application is shown, which may include the following steps:
The first depth data refers to vertical depth data indicative of a corresponding drilling depth of the bottom hole assembly. Bottom hole assemblies refer to tools used during drilling, including conventional while drilling tools, which refer to tools used during drilling to obtain survey point information (e.g., angle of hole). The drilling depth is used to indicate the actual depth that the bottommost end of the bottom hole assembly can reach during each drilling process. Optionally, the drilling depth for each drilling process is different.
Illustratively, referring collectively to FIG. 2, bottom hole assembly 20 includes a drill bit 21, a test point 22, and a blind zone 23. Wherein the drill bit 21 is located at one end of the bottom hole assembly 20, and the drill bit 21 is located at the lowermost end of the bottom hole assembly 20 for breaking formation rock during drilling; the detection point 22 is used for acquiring the measurement point information of the position of the detection point 22 in the drilling process, such as well depth, well inclination angle, azimuth and the like; the blind area 23 is located between the drill bit 21 and the detection point 22, and in the drilling engineering, a worker can predict the depth position of the drill bit 21 according to the length of the blind area 23 and by combining with the measurement point information obtained by the detection point 22, wherein the depth position refers to the vertical distance between the drill bit 21 and the drilling floor.
In an embodiment of the present application, the worker may acquire the first depth data during drilling. The first depth data can be obtained by analyzing an actual sample by a worker and used for indicating the actual depth reached by the bottom hole assembly in the drilling process. Wherein the actual depth may be the actual vertical distance between the bottommost end (drill bit) of the bottom hole assembly and the drill floor. Optionally, the step 101 includes the following steps:
1. a bottom hole sample is obtained during drilling of the bottom hole assembly.
The downhole sample is a downhole debris sample. Wherein the bottom hole rock debris sample is a debris sample after the rock below the drill floor has been broken by the drill bit of the bottom hole assembly. Alternatively, the downhole sample may be returned to the surface during drilling from downhole according to a drilling fluid that is recycled.
In one possible embodiment, the operator may drag downhole cuttings from the drilling fluid at intervals between logs and at a late time and clean the downhole cuttings. Optionally, different downhole cuttings correspond to different cleaning modes. For example, for dense, hard, and poorly water sensitive downhole debris, cleaning may be performed by elutriation or flushing; and for soft and loose bottom hole rock debris, the cleaning can be carried out by adopting a rinsing mode. And then, canning and sealing the cleaned bottom hole rock debris to obtain the bottom hole rock debris sample, namely the bottom hole sample.
2. And analyzing the bottom hole sample by taking the block standard profile as a reference to obtain first depth data.
The block standard profile is used to indicate data combination features contained in different depth positions of the geological layer of the target area, wherein the data combination features are used to indicate the types of elements contained in the geological layer of the target area and the proportion of each element, as shown in fig. 3, in the block standard profile, the data combination features 31 contained in the geological layers of different depths are different. Alternatively, the target area may be an area set by a worker according to actual conditions. In one possible embodiment, the target zone is the zone closest to the current well in which the drilling project is being conducted. In another possible embodiment, the target region is a region that is similar in geology to the region in which the drilling project is being performed.
Optionally, after the staff determines the target area, the staff may perform geological measurement on the target area according to a geological measurement instrument, and then draw a block standard profile corresponding to the target area. Of course, in another possible embodiment, after determining the target area, the worker may also drill in the target area to obtain a bottom hole sample, and analyze the bottom hole sample to draw a block standard profile corresponding to the target area.
In this embodiment, after obtaining the bottom hole sample, the operator analyzes the bottom hole sample, and determines the actual depth reached by the bottom hole assembly in the drilling process according to the analysis result for the bottom hole sample by using the block standard profile as a reference, so as to obtain the first depth data, where the first depth data includes the actual depth reached by the bottom hole assembly in the drilling process.
Alternatively, the operator may determine the first depth data based on a data combination characteristic contained in the downhole sample. In one possible embodiment, after obtaining the downhole sample, the operator analyzes a data feature combination contained in the downhole sample, the data feature combination indicating the elements (such as magnesium, silicon, calcium, etc.) contained in the downhole sample and the content of the elements. Optionally, the staff may determine the elements contained in the downhole sample and the element contents corresponding to different elements by using an X-ray fluorescence spectrum analyzer, and further determine the data feature combination contained in the downhole sample according to the elements and the element contents. And then, after acquiring the data feature combination contained in the bottom hole sample, the staff compares the data feature combination contained in the bottom hole sample with the block standard section by taking the block standard section as a reference, determines the geological formation depth conforming to the data feature combination contained in the bottom hole sample from the block standard section, and determines the first depth data by taking the geological formation depth as the actual depth reached by the bottom hole assembly in the drilling process.
The second depth data is data indicative of a bottom-most position of the bottom hole assembly. Bottom hole assembly refers to the tools used in the drilling process; the lowermost end of the bottom hole assembly refers to the end at which the drill bit is located during drilling, such as the end at which the drill bit 21 is located in fig. 2.
In an embodiment of the present application, the second depth data may be acquired by a worker during drilling. The second depth data can be acquired by the staff according to the measuring point information and used for indicating the predicted depth of the bottom hole assembly in the drilling process. The measuring point information refers to information collected by the measuring points of the bottom hole assembly. Optionally, the bottom hole assembly includes a conventional while drilling tool, and information about the detection point is obtained by the conventional while drilling tool during drilling. The predicted depth may be a predicted vertical distance between a bottommost end of the bottom hole assembly and the drill floor. Optionally, the step 102 includes the following steps:
1. and acquiring measuring point information detected by a measuring point on the bottom hole assembly.
The station information is used for indicating position information of the position where the detection point is located. In the embodiment of the application, in the drilling process, a worker can obtain the measuring point information detected by the measuring point according to the measuring point on the bottom hole assembly.
2. And acquiring second depth data according to the measuring point information.
In the embodiment of the application, after acquiring the measurement point information, the worker acquires second depth data according to the measurement point information.
Optionally, the measuring point information includes first measuring point information and second measuring point information. The first measuring point information is information obtained when the measuring point is located at a first position, and the second measuring point information is information obtained when the measuring point is located at a second position. The depth corresponding to the second position is greater than the depth corresponding to the first position based on the drill floor surface, and the depth is the vertical distance between a certain position and the drill floor surface, namely the vertical depth. Alternatively, the first position may be a last detection position of the second position.
Optionally, in this embodiment of the application, after obtaining the first measurement point information and the second measurement point information from the measurement points, the staff predicts a depth corresponding to the bottommost end of the bottom hole assembly when the measurement points are located at the second position according to the first measurement point information and the second measurement point information, and further obtains the second depth data, where the second depth data includes the predicted depth corresponding to the bottommost end of the bottom hole assembly.
Optionally, a tool worker may obtain a vertical depth variation, a sectional formation dip angle influence factor and a standard well contrast deviation according to the first measuring point information and the second measuring point information, and further determine the second data according to the vertical depth variation, the sectional formation dip angle influence factor and the standard well contrast deviation.
In one possible embodiment, the operator may determine the vertical depth variation based on the first gauge information, the second gauge information, and the blind zone length of the bottom hole assembly. Wherein the vertical depth variation is used for indicating the vertical depth variation data of the bottommost end position of the bottom hole assembly between the first measuring point and the second measuring point; the length of the blind zone of the bottom hole drilling assembly refers to the distance between the detection point and the lowest end of the bottom hole drilling assembly. And further, determining a sectional formation dip angle influence factor according to the information of the second measuring point and the length of the blind zone of the bottom hole assembly, and determining the second data according to the vertical depth variation, the sectional formation dip angle influence factor and the standard well contrast deviation. The standard well comparison deviation amount refers to an estimated deviation value for the second depth data acquired through standard well comparison.
Wherein the standard well refers to a reference well for a current well in which a drilling project is being performed. Alternatively, the standard well may be a reference well that has completed drilling and that the worker has complete data. In one possible implementation, the worker marks a first mark point in the standard, marks a second mark point in the current well, and uses the absolute value of the difference between the vertical depth data corresponding to the first mark point and the vertical depth data corresponding to the second mark point as the standard well contrast deviation. The position of the first mark point on the section of the block standard brick is the same as the position of the second mark point on the section of the block standard brick.
Optionally, in this embodiment of the application, the first measurement point information includes a first inclination angle, a first depth, and a first natural gamma value, and the second measurement point information includes a second inclination angle, a second depth, and a second natural gamma value. The first natural gamma value is used for indicating the geological characteristics of the first position, and the second natural gamma value is used for indicating the geological characteristics of the second position.
Optionally, the worker may obtain the vertical depth variation according to the first well inclination angle, the first well depth, the second well inclination angle, and the second well depth. In one possible embodiment, the operator determines a predicted well angle based on the first well angle, the first well depth, the second well angle, and the second well depth. Wherein the predicted inclination angle is used for indicating the inclination angle corresponding to the bottommost position of the bottom hole assembly. Further, the operator may determine the amount of change in sag based on the predicted angle of inclination in combination with the second angle of inclination and the length of the blind zone of the bottom hole assembly.
Optionally, the staff may obtain the above-mentioned influence factor of the dip of the segmented formation according to the second well inclination angle and the second natural gamma value. In one possible embodiment, the operator may compare the second angle of hole and the second natural gamma value to the reference well to determine a dip angle of the formation at the second location. Illustratively, as shown in FIG. 4, the operator determines a formation dip 43 at the second location based on the second borehole inclination 41 and the second natural gamma value 42. Further, determining the influence factor of the subsection stratum inclination angle according to the stratum inclination angle of the second position and the blind zone length of the bottom hole assembly.
Illustratively, assuming that the second well deviation angle is a, the predicted well deviation angle is B, the formation dip angle at the second location is C, the blind zone length is L, and the standard well contrast deviation is O
The above-mentioned vertical depth variation P1Comprises the following steps:
P1＝[(1-((B-A)*π/180)^2/24)*L*cos((B+A)*π/360)]；
the above-mentioned formation dip angle influence factor P2Comprises the following steps:
P2＝L*sin(C)；
therefore, the second depth data P is:
P＝P1+P2+O。
it should be noted that, in the embodiment of the present application, the step 102 may be executed after the step 101, may be executed before the step 101, or may be executed simultaneously with the step 101, which is not limited in the embodiment of the present application.
In step 103, determining that the drilling condition of the bottom hole assembly is expected in the event that the absolute value of the difference between the first depth data and the second depth data is less than a threshold value.
Optionally, after obtaining the first depth data and the second depth data, the staff member determines whether the drilling condition of the bottom hole assembly is expected according to the first depth data and the second depth data. The drilling condition includes a borehole angle of the bottom hole assembly during the drilling process, that is, whether the borehole angle during the drilling process meets expectations can be determined according to the first depth data and the second depth data. Optionally, determining that the angle of the bottom hole assembly during drilling is in accordance with the expectation if the difference between the first depth data and the second depth data is less than the threshold value.
In a possible implementation manner, if the drilling condition of the bottom hole assembly is expected, the operator may continue to obtain the first depth data and the second depth data corresponding to a third position after the second position according to the bottom hole assembly, and determine whether the drilling condition of the bottom hole assembly is expected again according to the first depth data and the second depth data corresponding to the third position, and so on until the drilling is completed.
In another possible embodiment, if the drilling condition of the bottom hole assembly does not meet the expectation, the operator may modify the drilling mode of the bottom hole assembly, re-acquire the first depth data and the second depth data, and re-determine whether the drilling condition of the bottom hole assembly meets the expectation after using the new drilling mode according to the first depth data and the second depth data.
In an embodiment of the present application, after obtaining the first depth data and the second depth data, the worker determines whether the drilling condition of the bottom hole assembly is expected according to an absolute value of a difference between the first depth data and the second depth data. Optionally, if the absolute value of the difference between the first depth data and the second depth data is smaller than the threshold, the worker may determine that the drilling condition of the bottom hole assembly is expected, and then continue to perform the next drilling operation; if the absolute value of the difference between the first depth data and the second depth data is greater than or equal to the threshold, the operator can determine that the drilling condition of the bottom hole assembly is not in accordance with the expectation, and further, the drilling condition of the bottom hole assembly is in accordance with the expectation by continuously modifying the drilling mode of the bottom hole assembly. Wherein the drilling condition comprises a slant angle of the bottom hole assembly during drilling.
Illustratively, referring to FIG. 5 in combination, in the current well 50, the operator may determine second depth data 55 for the second location from the second angle of inclination 51, the corresponding dip 52 for the second location, the blind zone length 53 of the bottom hole assembly, and the predicted angle of inclination 54. Further, the staff member may compare the second depth data 55 with the first depth data 56. If the absolute value of the difference 57 between the second depth data 55 and the first depth data 56 is less than the threshold, then it is determined that the drilling condition of the bottom hole assembly is expected.
To sum up, in the technical scheme provided by the embodiment of the application, whether the drilling condition is in accordance with the expectation is determined through the comparison of the first depth data and the second depth data, when the absolute value of the difference value between the first depth data and the second depth data is smaller than the threshold value, the drilling condition of the bottom hole assembly can be determined to be in accordance with the expectation through personnel, namely after the drilling condition of the bottom hole assembly is predicted, the accuracy judgment of the prediction result of the drilling condition can be realized, the operation is simple and convenient, the mastering is easy, whether the inclination angle in the drilling process meets the expected effect can be quickly analyzed, the correctness of the drilling track is ensured, and further the drilling rate of the reservoir can be effectively ensured.
In addition, the first depth data is data obtained through a bottom hole sample, and track prediction of the bottom hole assembly is carried out by combining geological data, so that the track prediction of the bottom hole assembly has a more basis.
It should be noted that, in this embodiment of the application, after obtaining the second depth data, the staff may determine, according to the second depth data, a predicted natural gamma value corresponding to the bottommost position of the bottom hole assembly, and further, in a subsequent drilling process, when the detection point is located at the bottommost position of the bottom hole assembly, the staff may obtain an actual natural gamma value collected by the detection point, verify the predicted natural gamma value, and further determine the accuracy of the second depth data.
By way of example, the technical solution of the present application is fully described with reference to fig. 6.
At step 602, elemental data contained in a downhole formation cuttings sample is analyzed.
And step 604, acquiring the first measuring point information and the second measuring point information. The first measuring point information is information obtained when the measuring point is located at a first position, and the second measuring point information is information obtained when the measuring point is located at a second position; the first position may be a last detected position of the second position.
And 608, modifying the drilling mode of the bottom hole assembly according to the expected inclination angle and the actual inclination angle, and executing from 601 again until the actual inclination angle of the bottom hole assembly in the drilling process accords with the expected inclination angle.
The above description is only exemplary of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of determining a drilling condition, the method comprising:
acquiring first depth data, wherein the first depth data is used for indicating drilling depth data corresponding to the bottommost end of a bottom hole assembly;
obtaining second depth data indicative of data obtained from measurement points of a conventional while drilling tool in the bottom hole assembly;
determining that drilling conditions of the bottom hole assembly are expected if an absolute value of a difference between the first depth data and the second depth data is less than a threshold.
2. The method of claim 1, wherein the obtaining first depth data comprises:
obtaining a bottom hole sample in the process of drilling the bottom hole assembly, wherein the bottom hole sample refers to a bottom hole rock debris sample;
analyzing the bottom hole sample by taking the block standard profile as a reference to obtain the first depth data;
wherein the block standard profile is used for indicating element data contained in different depth positions of geological layers of the target area.
3. The method of claim 2, wherein analyzing the downhole sample to obtain the first depth data based on a block standard profile comprises:
analyzing the elemental data contained in the downhole sample;
determining the first depth data from data combining features contained in the bottom hole sample based on the block standard profile.
4. The method of claim 1, wherein the obtaining second depth data comprises:
acquiring measuring point information detected by measuring points of a conventional drilling tool on the bottom hole drilling tool assembly;
and acquiring the second depth data according to the measuring point information.
5. The method according to claim 4, wherein the station information includes first station information and second station information, the first station information being information obtained when the detection point is at a first position, the second station information being information obtained when the detection point is at a second position; the depth corresponding to the second position is greater than the depth corresponding to the first position by taking the drilling platform surface as a reference;
the obtaining of the second depth data according to the measuring point information includes:
and acquiring the second depth data according to the first measuring point information and the second measuring point information.
6. The method of claim 5, wherein said obtaining said second depth data from said first station information and said second station information comprises:
determining a vertical depth variation according to the first measuring point information, the second measuring point information and the blind area length of the bottom hole assembly, wherein the vertical depth variation is used for indicating vertical depth data corresponding to the bottommost position of the bottom hole assembly;
determining influence factors of the sectional formation dip angle according to the second measuring point information and the length of the blind zone of the bottom hole assembly;
determining the second data according to the vertical depth variation, the subsection stratum inclination angle influence factors and a standard well contrast deviation, wherein the standard well contrast deviation refers to an estimated deviation value aiming at the second depth data, which is obtained through standard well comparison;
wherein the dead zone length of the bottom hole assembly is the distance between the detection point and the bottommost end of the bottom hole assembly.
7. The method of claim 6, wherein the first station information comprises a first angle of inclination, a first depth of well, and a first natural gamma value, and the second station information comprises a second angle of inclination, a second depth of well, and a second natural gamma value; wherein the first natural gamma value is indicative of a geological feature of the first location and the second natural gamma value is indicative of a geological feature of the second location.
8. The method of claim 7, wherein determining a change in drop depth from the first station information and the second station information comprises:
determining a predicted inclination angle according to the first inclination angle, the first depth of hole, the second inclination angle and the second depth of hole, wherein the predicted inclination angle is used for indicating an inclination angle corresponding to the bottommost position of the bottom hole assembly;
and determining the vertical depth variation according to the predicted inclination angle, the second inclination angle and the blind zone length of the bottom hole assembly.
9. The method of claim 7, wherein determining segmented formation dip angle influencing factors from the second station information comprises:
comparing the second well dip angle and the second natural gamma value to the reference well to determine a formation dip angle at the second location;
and determining the influence factors of the subsection stratum inclination angle according to the stratum inclination angle of the second position and the blind zone length of the bottom hole assembly.
10. The method according to any one of claims 1 to 9, further comprising:
determining that drilling conditions of the bottom hole assembly are not expected if an absolute value of a difference between the first depth data and the second depth data is greater than the threshold;
modifying the drilling pattern of the bottom hole assembly, and re-executing from the step of obtaining the first depth data until an absolute value of a difference between the first depth data and the second depth data is less than a threshold value.
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