CN113738345B - Method for judging drilling situation based on conventional while-drilling tool - Google Patents
Method for judging drilling situation based on conventional while-drilling tool Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000005259 measurement Methods 0.000 claims description 31
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 14
- 230000003631 expected effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000011435 rock 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
- 238000007251 Prelog reaction Methods 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
- 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
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 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
- 238000004091 panning Methods 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
-
- 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 drilling conditions 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; 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, determining that the drilling conditions of the bottom hole assembly are expected. According to the technical scheme provided by the embodiment of the application, after the well drilling condition of the bottom hole assembly is predicted, the accuracy judgment of the predicted result of the well drilling condition can be realized, the operation is simple and convenient, the grasping is easy, whether the well inclination angle in the well drilling process meets the expected effect can be rapidly analyzed, the correctness of the well drilling track is ensured, and the drilling meeting rate of a 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 shale gas reservoir horizontal well drilling process, due to objective factors of thin reservoir and complex and changeable underground structure, a geosteering technology is needed to analyze and convert well bottom measurement data into geological knowledge in real time, and accurate adjustment of drilling engineering tracks is carried out to improve the drilling meeting rate of the reservoir.
In the related art, a combination of a deflecting section rotary guiding tool and a horizontal section conventional while drilling tool is adopted in a large range to predict the drilling situation of the while drilling tool. Conventional measurement points of the while-drilling tool are about 13-18m away from the drill bit (about 4m compared with a rotary steering tool), and the prediction of the track deflection capability and the well deflection of the well bottom in the range of a longer measurement blind zone section of the well bottom is required to depend on the "empirical" knowledge of engineering technicians, such as prediction according to the track control condition (the ratio of sliding to composite drilling footage, the well deflection change condition and the like) in the length distance from the last measuring point to the current measuring point and the specific of the drilling tool combination.
However, in the above related art, since the drilling situation of the conventional while-drilling tool is predicted only according to the experience of the staff, the accuracy of the predicted drilling situation cannot be judged, so that deviation occurs in geosteering, and further, when a problem occurs in the well deviation angle during the drilling process, the problem cannot be determined and solved in time.
Disclosure of Invention
The embodiment of the application provides a method for judging drilling conditions based on a conventional tool while drilling, which can rapidly analyze whether the well inclination angle in the drilling process meets the expected effect and timely solve the problems in drilling. The technical proposal 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 drilling depth data corresponding to the bottommost end of a bottom hole assembly;
Acquiring second depth data, the second depth data being indicative of data acquired from measurement points of a conventional while-drilling tool in the bottom hole assembly;
and determining that the drilling condition of the bottom hole assembly meets expectations in the case that the absolute value of the difference between the first depth data and the second depth data is smaller than a threshold value.
In an exemplary embodiment, the acquiring the first depth data includes:
Acquiring a bottom hole sample during the drilling process of the bottom hole assembly, wherein the bottom hole sample is a bottom hole cuttings sample;
Analyzing the well bottom sample by taking a block standard section as a reference to obtain the first depth data;
the block standard section is used for indicating element data contained in different depth positions of geological layers of a target area.
In an exemplary embodiment, analyzing the bottom hole sample based on a block standard profile to obtain the first depth data includes:
analyzing elemental data contained in the downhole sample;
and determining the first depth data according to the data combination characteristics contained in the well bottom sample by taking the block standard section as a reference.
In an exemplary embodiment, the acquiring the second depth data includes:
Acquiring measuring point information detected by a detecting point of a conventional while-drilling tool on the bottom hole assembly;
and acquiring the second depth data according to the measuring point information.
In an exemplary embodiment, the station information includes first station information and second station information, the first station information is information acquired when the detection point is located at a first position, and the second station information is information acquired when the detection point is located at a second position; the depth corresponding to the second position is larger than the depth corresponding to the first position by taking the drilling table surface as a reference;
the obtaining the second depth data according to the measurement 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 station information and the second station 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 a section stratum inclination angle influence factor according to the second measuring point information and the blind area length of the bottom hole assembly;
Determining the second data according to the vertical depth variation, the sectional stratum inclination angle influence factor and a standard well contrast deviation value, wherein the standard well contrast deviation value refers to an estimated deviation value for the second depth data, which is obtained through standard well contrast;
Wherein the blind zone length of the bottom hole assembly refers to the distance between the detection point and the bottommost end of the bottom hole assembly.
In an exemplary embodiment, the first station information includes a first well inclination angle, a first well depth, and a first natural gamma value, and the second station information includes a second well inclination angle, a second well depth, and a second natural gamma value; wherein the first natural gamma value is used to indicate a geological feature of the first location and the second natural gamma value is used to indicate a geological feature of the second location.
In an exemplary embodiment, the determining a vertical depth variation according to the first station information and the second station information includes:
Determining a predicted well inclination angle according to the first well inclination angle, the first well depth, the second well inclination angle and the second well depth, wherein the predicted well inclination angle is used for indicating a well inclination angle corresponding to the bottommost position of the bottom hole assembly;
and determining the vertical depth variation according to the predicted well inclination angle, the second well inclination angle and the blind area length of the bottom hole assembly.
In an exemplary embodiment, determining the influence factor of the section stratum inclination angle according to the second measuring point information includes:
Comparing the second well inclination angle and the second natural gamma value with the standard well to determine a formation inclination angle of the second location;
and determining the influence factors of the sectional stratum inclination angle according to the stratum inclination angle of the second position and the blind area length of the bottom hole assembly.
In an exemplary embodiment, the method further comprises:
Determining that the drilling conditions of the bottom hole assembly are not expected if the absolute value of the 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 acquiring first depth data until the absolute value of the difference between the first depth data and the second depth data is less than a threshold.
The technical scheme provided by the embodiment of the application has the beneficial effects that:
And comparing the first depth data with the second depth data to determine whether the drilling situation accords with expectations, and when the absolute value of the difference value between the first depth data and the second depth data is smaller than a threshold value, determining that the drilling situation of the bottom hole assembly accords with expectations by personnel, namely, after the drilling situation of the bottom hole assembly is predicted, accurately judging the predicted result of the drilling situation can be realized, the operation is simple and convenient, the operation is easy to grasp, whether the well inclination angle in the drilling process meets the expected effect can be rapidly analyzed, the accuracy of the drilling track is ensured, and the drilling meeting rate of a reservoir can be effectively ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining drilling conditions according to one embodiment of the present application;
FIG. 2 schematically illustrates a schematic view of the structure of a bottom hole assembly;
FIG. 3 illustrates a schematic diagram of a standard cross-section of a block;
FIG. 4 is a schematic diagram illustrating a manner of obtaining formation dip;
FIG. 5 illustrates a schematic diagram for determining whether a drilling situation is expected;
Fig. 6 is a schematic diagram schematically illustrating a determination of a drilling situation.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of a method for determining drilling conditions according to an embodiment of the present application is shown, where the method may include the following steps:
step 101, obtaining first depth data.
The first depth data refers to vertical depth data indicating a drilling depth corresponding to the bottom hole assembly. A bottom hole assembly refers to a tool used during drilling that includes conventional while drilling tools, which are used to obtain survey point information (e.g., well inclination) during drilling. The drilling depth is used to indicate the actual depth that the bottommost end of the bottom hole assembly can reach during each drilling event. Optionally, the drilling depth corresponding to each drilling process is different.
Illustratively, referring to FIG. 2 in combination, a bottom hole assembly 20 includes a drill bit 21, a check point 22, and a blind spot 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 bottommost end of the bottom hole assembly 20 for breaking up formation rock during drilling; the detecting point 22 is used for acquiring information of a detecting point where the detecting point 22 is located, such as well depth, well inclination angle, azimuth, etc., in the drilling process; the blind area 23 is located between the drill bit 21 and the detection point 22, and in drilling engineering, a worker can predict the depth position of the drill bit 21 according to the length of the blind area 23 and the detection point information acquired by the detection point 22, wherein the depth position refers to the vertical distance between the drill bit 21 and the drill floor surface.
In the embodiment of the application, the staff member can acquire the first depth data in the drilling process. The first depth data may be obtained by analyzing an actual sample by a worker, and is used to indicate an actual depth reached by the bottom hole assembly during drilling. Wherein the actual depth may be the actual vertical distance between the bottommost end (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 bottom hole sample refers to a bottom hole cuttings sample. Wherein the bottom hole cuttings sample refers to a cuttings sample after rock below the drill floor is knocked down by the drill bit of the bottom hole assembly. Alternatively, the bottom hole sample may be returned to the drilling surface from the bottom hole during the drilling process according to the drilling fluid, wherein the drilling fluid is recycled.
In one possible embodiment, the operator may scoop the bottom hole cuttings from the drilling fluid at intervals and late times and clean the bottom hole cuttings. Optionally, different downhole cuttings may be cleaned differently. For example, for tight, hard, poorly water sensitive bottom hole cuttings, the cleaning may be performed by means of panning or flushing; for soft and loose bottom hole cuttings, the bottom hole cuttings can be cleaned in a rinsing mode. And then canning and sealing the cleaned bottom hole cuttings to obtain the bottom hole cuttings sample, namely, the bottom hole sample.
2. And analyzing the well bottom sample by taking the standard section of the block as a reference to obtain first depth data.
The block standard section is used for indicating the data combination characteristics contained in different depth positions of the geological layer of the target area, wherein the data combination characteristics are used for indicating the element types and the proportion of each element contained in the geological layer of the target area, and as shown in fig. 3, the data combination characteristics 31 contained in the geological layer with different depths are different in the block standard section. 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 performed. In another possible embodiment, the target area is an area similar to the geological condition of the area in which the drilling project is being performed.
Optionally, after determining the target area, the staff may perform geological measurement on the target area according to a geological measuring instrument, so as to draw a standard section of the block corresponding to the target area. Of course, in another possible implementation manner, after the operator determines the target area, drilling may be performed on the target area to obtain a bottom hole sample, and the bottom hole sample is analyzed to draw a standard section of the block corresponding to the target area.
In the embodiment of the application, after the staff obtains the bottom hole sample, the staff analyzes the bottom hole sample, determines the actual depth reached by the bottom hole assembly in the drilling process according to the analysis result of the bottom hole sample by taking the block standard section as a reference, and further obtains the first depth data, wherein the first depth data comprises the actual depth reached by the bottom hole assembly in the drilling process.
Alternatively, the operator may determine the first depth data based on the data combination characteristics contained in the downhole sample. In one possible embodiment, after the operator obtains the bottom hole sample, the operator analyzes a combination of data features contained in the bottom hole sample, the combination of data features being indicative of elements (e.g., magnesium, silicon, calcium, etc.) contained in the bottom hole sample, and the element content. Optionally, the staff member may determine the elements contained in the bottom hole sample and the element contents corresponding to the different elements through an X-ray fluorescence spectrum analyzer, and further determine the data feature combination contained in the bottom hole sample according to the elements and the element contents. After acquiring the data feature combination contained in the bottom hole sample, the staff member compares the data feature combination contained in the bottom hole sample with a block standard section by taking the block standard section as a reference, determines the geological depth conforming to the data feature combination contained in the bottom hole sample from the block standard section, takes the geological depth as the actual depth reached by the bottom hole assembly in the drilling process, and further determines the first depth data.
Step 102, obtaining second depth data.
The second depth data refers to data indicating a bottommost position of the bottom hole assembly. Bottom hole assembly refers to tools used in the drilling process; the bottommost end of the bottom hole assembly refers to the end at which the drill bit is disposed during drilling, such as the end at which drill bit 21 is located in fig. 2.
In the embodiment of the application, the staff member can acquire the second depth data in the drilling process. The second depth data may be obtained by a worker according to the measurement point information, and is used for indicating a predicted depth reached by the bottom hole assembly in the drilling process. The measurement point information refers to information collected by a measurement point of the bottom hole assembly. Optionally, the bottom hole assembly includes a conventional while drilling tool, and the information of the detection point is obtained by the conventional while drilling tool during the drilling process. 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 the measuring point information detected by the detecting point on the bottom hole assembly.
The measuring point information is used for indicating the position information of the position where the measuring point is located. In the embodiment of the application, in the drilling process, a worker can acquire 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 the staff member acquires the measuring point information, the staff member acquires the second depth data according to the measuring point information.
Optionally, the measurement point information includes first measurement point information and second measurement point information. The first measuring point information is information obtained when the detecting point is located at the first position, and the second measuring point information is information obtained when the detecting point is located at the second position. And taking the drilling platform surface as a reference, wherein the depth corresponding to the second position is larger than the depth corresponding to the first position, and the depth refers to the vertical distance between a certain position and the drilling platform surface, namely the vertical depth. Alternatively, the first position may be a last detected position of the second position.
Optionally, in the embodiment of the present application, after the first measurement point information and the second measurement point information are obtained according to the measurement point, the operator predicts the depth corresponding to the bottommost end of the bottom hole assembly when the measurement point is located at the second position according to the first measurement point information and the second measurement point information, so as to obtain the second depth data, where the second depth data includes the predicted depth corresponding to the bottommost end of the bottom hole assembly.
Optionally, the tool personnel may obtain the sag change amount, the segmented formation inclination angle influence factor and the standard well contrast deviation amount according to the first measurement point information and the second measurement point information, so as to determine the second data according to the sag change amount, the segmented formation inclination angle influence factor and the standard well contrast deviation amount.
In one possible embodiment, the operator may determine the vertical depth change based on the first station information, the second station information, and the blind zone length of the bottom hole assembly. Wherein the vertical depth variation is used for indicating vertical depth variation data between the first measuring point and the second measuring point at the bottommost position of the bottom hole assembly; the blind zone length of a bottom hole assembly refers to the distance between the detection point and the bottommost end of the bottom hole assembly. Further, determining a section formation dip angle influence factor according to the second measurement point information and the blind zone length of the bottom hole assembly, and determining the second data according to the vertical depth change amount, the section formation dip angle influence factor and the standard well contrast deviation amount. The standard well contrast deviation value refers to an estimated deviation value for the second depth data obtained through standard well contrast.
Wherein the standard well is a reference well indicating the current well being drilled. Alternatively, the standard well may be a reference well where drilling has been completed and the personnel has knowledge of the 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 value. The position of the first mark point on the block standard section is the same as the position of the second mark point on the block standard section.
Optionally, in an embodiment of the present application, the first measurement point information includes a first well inclination angle, a first well depth, and a first natural gamma value, and the second measurement point information includes a second well inclination angle, a second well depth, and a second natural gamma value. The first natural gamma value is used for indicating the geological feature of the first position, and the second natural gamma value is used for indicating the geological feature of the second position.
Alternatively, the operator may obtain the vertical depth variation according to the first well angle, the first well depth, the second well angle, and the second well depth. In one possible embodiment, the operator determines the pre-log angle based on the first well angle, the first well depth, the second well angle, and the second well depth. The predicted well inclination angle is used for indicating the well inclination angle corresponding to the bottommost position of the bottom hole assembly. Further, the operator may determine the vertical depth variation based on the predicted well angle in combination with the second well angle and the blind zone length of the bottom hole assembly.
Alternatively, the operator may obtain the above-described segmented formation dip angle influencing factor based on the second well angle and the second natural gamma value. In one possible embodiment, the operator may compare the second well inclination angle and the second natural gamma value to the standard well to determine the formation inclination at the second location. Illustratively, as shown in FIG. 4, the operator determines a formation dip 43 at a second location based on a second well angle 41 and a second natural gamma value 42. Further, determining the segmented formation dip influencing factor based on the formation dip at the second location and the blind zone length of the bottom hole assembly.
Exemplary, assuming that the second well inclination angle is A, the pre-logging inclination angle is B, the formation inclination angle at the second position is C, the blind zone length is L, and the standard well contrast deviation is O, then
The vertical depth variation P 1 is as follows:
P1＝[(1-((B-A)*π/180)^2/24)*L*cos((B+A)*π/360)]；
the stratum inclination angle influencing factor P 2 is as follows:
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 performed after the step 101, may be performed before the step 101, may be performed simultaneously with the step 101, and the embodiment of the present application is not limited thereto.
Step 103, determining that the drilling situation of the bottom hole assembly meets the expectations in the case that the absolute value of the difference between the first depth data and the second depth data is smaller than the threshold value.
Optionally, after acquiring the first depth data and the second depth data, the staff member determines whether the drilling situation of the bottom hole assembly meets the expectations according to the first depth data and the second depth data. The drilling condition includes a well deviation angle of the bottom hole assembly in the drilling process, that is, according to the first depth data and the second depth data, whether the well deviation angle in the drilling process meets the expectations can be judged. Optionally, determining that the well inclination angle of the bottom hole assembly during drilling meets expectations if the difference between the first depth data and the second depth data is less than a threshold.
In one possible embodiment, if the drilling situation of the bottom hole assembly meets the expectations, the operator may continue to acquire the first depth data and the second depth data corresponding to the third position after the second position according to the bottom hole assembly, and determine whether the drilling situation of the bottom hole assembly meets the expectations 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 situation of the bottom hole assembly is not expected, the operator may modify the drilling mode of the bottom hole assembly, retrieve the first depth data and the second depth data, and re-determine whether the drilling situation of the bottom hole assembly is expected after using the new drilling mode according to the first depth data and the second depth data.
In the embodiment of the application, after the first depth data and the second depth data are acquired, the staff member determines whether the drilling condition of the bottom hole assembly meets the expectations according to the absolute value of the difference value 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 less than the threshold, the operator may determine that the drilling situation of the bottom hole assembly meets the expectations, and further 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 may determine that the drilling situation of the bottom hole assembly is not expected, and then continuously modify the drilling mode of the bottom hole assembly to make the drilling situation of the bottom hole assembly expected. Wherein the drilling conditions include a well inclination angle of the bottom hole assembly during drilling.
Illustratively, referring to FIG. 5 in combination, in the current well 50, a worker may determine second depth data 55 for a second location by a second well inclination angle 51, a formation inclination angle 52 corresponding to the second location, a blind zone length 53 of the bottom hole assembly, and a predicted well inclination angle 54. Further, the staff member may compare the second depth data 55 with the first depth data 56. If the absolute value 57 of the difference between the second depth data 55 and the first depth data 56 is less than the threshold, then the drilling situation of the bottom hole assembly is determined to be expected.
In summary, in the technical solution provided in the embodiment of the present application, whether the drilling situation meets the expectations is determined by comparing the first depth data and the second depth data, and when the absolute value of the difference between the first depth data and the second depth data is smaller than the threshold value, personnel can determine that the drilling situation of the bottom hole assembly meets the expectations, that is, after the drilling situation of the bottom hole assembly is predicted, accuracy judgment on the predicted result of the drilling situation can be achieved, the operation is simple and convenient, the grasping is easy, whether the well inclination angle in the drilling process meets the expected effect can be rapidly analyzed, the accuracy of the drilling track is ensured, and then the drilling meeting rate of the reservoir can be effectively ensured.
In addition, the first depth data is data acquired through a bottom hole sample, and the trajectory prediction of the bottom hole assembly is performed by combining geological data, so that the trajectory prediction of the bottom hole assembly is more based.
It should be noted that, in the embodiment of the present application, after the operator acquires the second depth data, the operator may determine the predicted natural gamma value corresponding to the bottommost position of the bottom hole assembly according to the second depth data, further, in the subsequent drilling process, when the detection point is located at the bottommost position of the bottom hole assembly, the operator may acquire the 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.
The technical solution of the present application will be fully described with reference to fig. 6 by way of example.
Step 601, a downhole cuttings sample is obtained.
Step 602, analyzing element data contained in a downhole cuttings sample.
Step 603, determining first depth data according to element data contained in the bottom hole cuttings sample based on the block standard section.
Step 604, obtaining first measurement point information and second measurement point information. The first measuring point information is information acquired when the detecting point is located at a first position, and the second measuring point information is information acquired when the detecting point is located at a second position; the first position may be a last detected position of the second position.
Step 605, determining second depth data according to the first measuring point information and the second measuring point information.
Step 606 determines whether the absolute value of the difference between the first depth data and the second depth data is less than a threshold. If the absolute value of the difference between the first depth data and the second depth data is less than the threshold, then step 607 is performed; 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, then step 608 is performed.
Step 607, determining that the actual well angle of the bottom hole assembly during drilling meets the expected well angle, ending the process.
Step 608, modifying the drilling mode of the bottom hole assembly according to the expected well inclination angle and the actual well inclination angle, and re-executing from step 601 until the actual well inclination angle of the bottom hole assembly during the drilling process meets the expected well inclination angle.
The foregoing description of the exemplary embodiments of the application is not intended to limit the application to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the application.
Claims (2)
1. A method for determining a drilling condition, the method comprising:
acquiring a bottom hole sample during the drilling process of a bottom hole assembly, wherein the bottom hole sample refers to a bottom hole cuttings sample;
analyzing elemental data contained in the downhole sample;
Determining first depth data according to the data combination characteristics contained in the bottom hole sample by taking a block standard section as a reference, wherein the first depth data is drilling depth data corresponding to the bottommost end of the bottom hole assembly, and the block standard section is element data contained in different depth positions of geological layers of a target area;
Acquiring first measurement point information and second measurement point information detected by a detection point of a conventional while-drilling tool on the bottom hole assembly, wherein the first measurement point information refers to information acquired when the detection point is positioned at a first position, the first measurement point information comprises a first well inclination angle, a first well depth and a first natural gamma value, the second measurement point information refers to information acquired when the detection point is positioned at a second position, the second measurement point information comprises a second well inclination angle, a second well depth and a second natural gamma value, the drilling table surface is taken as a reference, the depth corresponding to the second position is larger than the depth corresponding to the first position, the first natural gamma value is used for indicating geological features of the first position, and the second natural gamma value is used for indicating geological features of the second position;
Determining a predicted well inclination angle according to the first well inclination angle, the first well depth, the second well inclination angle and the second well depth, wherein the predicted well inclination angle is used for indicating a well inclination angle corresponding to the bottommost position of the bottom hole assembly;
determining a vertical depth variation according to the predicted well inclination angle, the second well inclination angle and the blind zone 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, and the blind zone length of the bottom hole assembly refers to the distance between the detection point and the bottommost end of the bottom hole assembly;
Comparing the second well inclination angle and the second natural gamma value with a standard well to determine a stratum inclination angle of the second position;
determining a segmented formation dip angle influencing factor according to the formation dip angle at the second position and the blind zone length of the bottom hole assembly;
Determining second depth data according to the vertical depth variation, the subsection stratum inclination angle influence factor and a standard well contrast deviation value, wherein the standard well contrast deviation value refers to an estimated deviation value for the second depth data, which is obtained through standard well comparison, and the second depth data refers to data which is used for indicating to be obtained according to a measuring point of a conventional while-drilling tool in the bottom hole assembly;
and determining that the drilling condition of the bottom hole assembly meets expectations in the case that the absolute value of the difference between the first depth data and the second depth data is smaller than a threshold value.
2. The method according to claim 1, wherein the method further comprises:
Determining that the drilling conditions of the bottom hole assembly are not expected if the absolute value of the 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 restarting the step of acquiring a bottom hole sample during the bottom hole assembly drilling until the absolute value of the difference between the first depth data and the second depth data is less than a threshold value.
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