CN109138985B - Method and device for determining full-angle change rate of pipeline directional drilling crossing track - Google Patents
Method and device for determining full-angle change rate of pipeline directional drilling crossing track Download PDFInfo
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- CN109138985B CN109138985B CN201710495346.7A CN201710495346A CN109138985B CN 109138985 B CN109138985 B CN 109138985B CN 201710495346 A CN201710495346 A CN 201710495346A CN 109138985 B CN109138985 B CN 109138985B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The invention discloses a method and a device for determining the full-angle change rate of a pipeline directional drilling crossing track, and belongs to the field of oil and gas pipelines. The method comprises the following steps: determining the theoretical total angle change rate of a measurement section between every two adjacent measurement points in the n measurement points of the pore-forming track to obtain the theoretical total angle change rate of n-1 measurement sections; determining m calculation segments from the n-1 measurement segments; determining a correction factor for each of the m computation segments; and multiplying the theoretical total angle change rate of each measuring section in the n-1 measuring sections by the correction coefficient corresponding to the calculating section where the measuring section is located respectively to obtain the actual total angle change rate of the n-1 measuring sections when the pipeline is dragged back. According to the invention, the full-angle change rate of the pore-forming track is corrected to obtain the more accurate actual full-angle change rate when the pipeline drags back, so that the severity of the full-angle change rate when the pipeline directional drill passes through is evaluated, and the phenomenon that the operator generates misjudgment due to the fact that the pore-forming track determines larger drag force is avoided.
Description
Technical Field
The invention relates to the field of oil and gas pipelines, in particular to a method and a device for determining the full-angle change rate of a pipeline directional drilling crossing track.
Background
With the continuous development of the technology, the directional drilling technology has become a traversing technology widely adopted by oil and gas pipeline traversing construction, and during the directional drilling construction process of the pipeline, the pipeline can traverse rivers, ditches, expressways and the like through a directional system, so that the influence of seasons, ground structures, rivers and the like is avoided. However, due to the influence of geological conditions, the drill bit is prevented from being hard and soft during the directional drilling process, so that the hole forming track of the pipeline directional drilling forms an S-shaped curve, the local curvature suddenly changes, and the full-angle change rate sudden change phenomenon of the hole forming track occurs, which is commonly called as a dog-leg degree phenomenon.
In the related technology, in the process of directional drilling of the pipeline, the back dragging force required when the pipeline drags back is determined through the full-angle change rate of the pore-forming track of the directional drilling of the pipeline, so that the severity of the full-angle change rate of the pore-forming track is judged, and the occurrence of pipe clamping accidents when the pipeline drags back is avoided.
However, because the diameter of the pipe is smaller than the diameter of the hole forming track, and because of rigidity, the curvature of the pipe will be smaller than the curvature of the hole forming track, and there is a space between the pipe and the wall of the hole forming track, the actual back drag of the pipe will be smaller than the back drag determined based on the full angular rate of change of the hole forming track. That is, the back-dragging force calculated according to the full-angle change rate of the pore-forming track is large, and the false judgment is easily caused by constructors.
Disclosure of Invention
In order to solve the problems in the prior art, the embodiment of the invention provides a method and a device for determining the full-angle change rate of a pipeline directional drilling crossing track. The technical scheme is as follows:
in a first aspect, a method for determining a full-angle change rate of a pipeline directional drilling crossing track is provided, the method comprising:
determining the theoretical total angle change rate of a measuring section between every two adjacent measuring points in n measuring points of a pore-forming track to obtain the theoretical total angle change rate of n-1 measuring sections, wherein the n measuring points are position points for measuring the pore-forming track in the process of performing directional drilling on a pipeline;
determining m calculation segments from the n-1 measurement segments, the m being less than the n;
determining a correction factor for each of the m computation segments;
and multiplying the theoretical total angle change rate of each measuring section in the n-1 measuring sections by the correction coefficient corresponding to the calculating section where the measuring section is located respectively to obtain the actual total angle change rate of the n-1 measuring sections when the pipeline is dragged back.
Optionally, the determining m calculation segments from the n-1 measurement segments includes:
calculating a deflection value of the pipeline between the ith measuring point and the (i + j) th measuring point along a pore-forming track according to the measuring data of the ith measuring point and the (i + j) th measuring point in the n measuring points, wherein i is 1, and j is 1, and i + j is less than or equal to n;
if the deflection value is larger than the difference value between the radius of the pore-forming track and the radius of the pipeline, determining a measuring section between the ith measuring point and the (i + j) th measuring point as a calculating section, making i equal to i +1, and returning to the step of calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point;
if the deflection value is smaller than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, the step of enabling j to be j +1, returning the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point, calculating the deflection value between the ith measurement point and the (i + j) th measurement point until the calculated deflection value is larger than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, determining the measurement section between the ith measurement point and the (i + j) th measurement point as a calculation section, enabling i to be i + j, j to be 1, and returning the step of calculating the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point.
Optionally, the calculating a deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point in the n measurement points includes:
determining a change value of a hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and a straight-line distance between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point;
according to the change value of the hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and the linear distance between the ith measuring point and the (i + 1) th measuring point, calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the following formula;
wherein ω is a deflection value between the ith measurement point and the (i + j) th measurement point, Δ α is a variation value of a hole bevel angle of the hole forming track between the ith measurement point and the (i + j) th measurement point, and Δ L is a linear distance between the ith measurement point and the (i + j) th measurement point.
Optionally, the determining the correction coefficient of each of the m calculation segments includes:
for each calculation section in the m calculation sections, determining a change value of a hole bevel angle of the hole forming track between two end points of the calculation section and a linear distance between the two end points of the calculation section according to measurement data of the two end points of the calculation section;
calculating a correction coefficient of the calculation section according to the diameter of the pipeline, the ratio of the diameter of the pore-forming track to the diameter of the pipeline, the change value of the pore bevel angle of the pore-forming track between the two end points of the calculation section and the linear distance between the two end points of the calculation section by using a combined formula as follows;
wherein, F refers to a correction coefficient of the calculation section, ω refers to a deflection value between two end points of the calculation section, Δ α refers to a change value of a hole oblique angle of the hole forming track between the two end points of the calculation section, Δ α' refers to a change value of a hole oblique angle between the two end points of the calculation section when the pipe is pulled back, Δ L refers to a linear distance between the two end points of the calculation section, D refers to a diameter of the pipe, and k refers to a ratio between the diameter of the hole forming track and the diameter of the pipe.
In a second aspect, there is provided an apparatus for determining the rate of change of the total angle of a trajectory traversed by a directional drilling of a pipe, the apparatus comprising:
the device comprises a first determining module, a second determining module and a control module, wherein the first determining module is used for determining the theoretical total angle change rate of a measuring section between every two adjacent measuring points in n measuring points of a pore-forming track to obtain the theoretical total angle change rate of n-1 measuring sections, and the n measuring points are position points for measuring the pore-forming track in the process of directional drilling of a pipeline;
a second determining module for determining m calculation segments from the n-1 measurement segments, the m being smaller than the n;
a third determining module, configured to determine a correction coefficient for each of the m computation segments;
and the operation module is used for multiplying the theoretical total angle change rate of each measuring section in the n-1 measuring sections by the correction coefficient corresponding to the calculating section where the measuring section is located, so as to obtain the actual total angle change rate of the n-1 measuring sections when the pipeline is dragged back.
Optionally, the second determining module includes:
the first calculation submodule is used for enabling i to be 1 and j to be 1, calculating a deflection value of the pipeline between the ith measurement point and the (i + j) th measurement point along the pore-forming track according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point in the n measurement points, wherein the i + j is less than or equal to the n;
a first determining submodule, configured to determine, if the deflection value is greater than a difference between a radius of the pore-forming trajectory and a radius of the pipeline, a measurement segment between the ith measurement point and the (i + j) th measurement point as a calculation segment, make i ═ i +1, and return to a step of calculating a deflection value between the ith measurement point and the (i + j) th measurement point according to measurement data of the ith measurement point and measurement data of the (i + j) th measurement point;
a second determining submodule for determining if said deflection value is less than or equal to a difference between a radius of said bore forming trajectory and a radius of said pipe, then, when j is equal to j +1, returning to calculate the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point until the calculated deflection value is greater than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, determining a measurement segment between the ith measurement point and the (i + j) th measurement point as a calculation segment, and setting i to i + j and j to 1, and returning to the step of calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point.
Optionally, the first computing submodule is specifically configured to:
determining a change value of a hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and a straight-line distance between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point;
according to the change value of the hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and the linear distance between the ith measuring point and the (i + j) th measuring point, calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the following formula;
wherein ω is a deflection value between the ith measurement point and the (i + j) th measurement point, Δ α is a variation value of a hole bevel angle of the hole forming track between the ith measurement point and the (i + j) th measurement point, and Δ L is a linear distance between the ith measurement point and the (i + j) th measurement point.
Optionally, the third determining module includes:
the third determining submodule is used for determining a change value of a hole bevel angle of the hole forming track between two end points of the computing section and a linear distance between the two end points of the computing section according to the measurement data of the two end points of the computing section for each computing section in the m computing sections;
the second calculation submodule is used for calculating the correction coefficient of the calculation section according to the following combined formula according to the diameter of the pipeline, the ratio of the diameter of the pore-forming track to the diameter of the pipeline, the change value of the pore oblique angle of the pore-forming track between the two end points of the calculation section and the linear distance between the two end points of the calculation section;
wherein, F is a correction coefficient of the calculation section, ω is a deflection value between two end points of the calculation section, Δ α is a change value of a hole oblique angle between the two end points of the calculation section of the hole forming track, Δ α' is a change value of a hole oblique angle between the two end points of the calculation section when the pipe is dragged back, Δ L is a linear distance between the two end points of the calculation section, D is a diameter of the pipe, and k is a ratio between the diameter of the hole forming track and the diameter of the pipe.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the theoretical total angle change rate of the pore-forming track is corrected to obtain the actual total angle change rate when the pipeline drags back, so that the back dragging force required when the pipeline drags back is determined more accurately, and the phenomenon that an operator generates misjudgment due to the fact that the pore-forming track determines the larger back dragging force is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 for determining a full angular rate of change of a track traversed by a directional drilling of a pipeline according to an embodiment of the present invention;
FIG. 2 is a graph of correction factors versus hole slope angle variation values for via formation trajectories provided by an embodiment of the present invention;
FIG. 3 is a graph of correction coefficients versus linear distance between two end points of a computed segment according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a full-angle rate-of-change determining apparatus for a pipeline directional drilling crossing trajectory according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining a full-angle change rate of a pipeline directional drilling crossing trajectory according to an embodiment of the present invention. Referring to fig. 1, the method includes:
step 101: and determining the theoretical total angle change rate of the measuring section between every two adjacent measuring points in the n measuring points of the pore-forming track to obtain the theoretical total angle change rate of n-1 measuring sections, wherein the n measuring points are position points for measuring the pore-forming track in the process of performing directional drilling on the pipeline.
In the construction process of the directional pipe drill, n position points can be selected as measuring points on a pore-forming track of the directional pipe drill and measured to obtain measuring data corresponding to the n measuring points. The measurement data for each measurement point may generally include, among other things, a hole bevel angle, a hole bevel azimuth angle, and location information for the measurement point at the hole-forming track.
And determining the hole forming track between every two adjacent measuring points in the selected n measuring points as a measuring section, thereby obtaining n-1 measuring sections. For each of the n-1 measurement sections, determining a difference between hole inclination angles in the measurement data of two measurement points constituting the measurement section, determining the difference as a variation value of the hole inclination angles corresponding to the two measurement points, and determining an average value of the hole inclination angles corresponding to the two measurement points. And determining the difference between the hole inclination azimuth angles in the measurement data of the two measurement points, and determining the difference as the theoretical change value of the hole inclination azimuth angles corresponding to the two measurement points. And determining the straight-line distance between the position information in the measurement data of the two measurement points to obtain the straight-line distance between the two measurement points.
Then, determining the theoretical total angle change rate of the measuring section according to the following formula (1) by the change value of the hole bevel angle, the average value of the hole bevel angle, the change value of the hole bevel azimuth angle and the linear distance between the two measuring points of the hole forming track corresponding to the two measuring points, thereby determining the total angle change rate corresponding to n-1 measuring sections;
wherein, in the above formula (1), K is a theoretical total angle change rate of the measurement section, Δ α is a change value of a hole inclination angle of the hole forming track at the two measurement points, Δ Φ is a change value of a hole inclination azimuth angle of the hole forming track at the two measurement points, and αcThe hole inclination of the hole forming track at the two measuring pointsThe average value of the angle, Δ L, is the linear distance, sin, between the two measurement points2αcRefers to a sinusoidal function of the average of the pore-forming trajectory at the pore bevel angle.
Wherein, the total angle change rate refers to the angle change of a pore-forming track curve of the measuring section in a three-dimensional space, and n is a constant not less than 2.
After the theoretical total angular rate of change of each of the n-1 measurement segments is determined, in order to determine the actual total angular rate of change of each of the n-1 measurement segments when the pipeline is pulled back, the determination of the correction coefficient for correcting the theoretical total angular rate of change of each of the measurement segments may be first implemented through steps 102 to 103.
Step 102: m calculation segments are determined from the n-1 measurement segments, m being smaller than n.
In the back dragging process of the pipeline, the pipeline can generate corresponding uniform bending deformation according to a pore-forming track curve, and the bending deformation of the pipeline can be regarded as a plane curve, namely, the change value of the hole inclined azimuth angle of each measuring section in n-1 measuring sections can be ignored, and the bending deformation amount of a pipeline in the same plane can be determined as the bending value of the pipeline. Wherein, the deflection value refers to the displacement of the circle center of the cross section along a line vertical to the axis.
In addition, when the bending deformation of the pipe has a deflection value greater than the difference between the radius of the hole forming trajectory and the radius of the pipe, there may be an error between the actual back dragging force of the pipe and the back dragging force calculated based on the theoretical total angular change rate of the n-1 measurement sections. Therefore, n-1 measurement segments need to be divided to determine m calculation segments having a deflection value greater than the difference between the radius of the hole-forming trajectory and the radius of the pipe.
Specifically, m calculation sections having a deflection value larger than the difference between the radius of the hole forming trajectory and the radius of the pipe may be determined by the following steps (1) to (3).
(1) And (3) setting i to 1 and j to 1, and calculating a deflection value of the pipeline between the ith measuring point and the (i + j) th measuring point along the pore-forming track according to the measuring data of the ith measuring point and the (i + j) th measuring point in the n measuring points, wherein i + j is less than or equal to n.
The specific implementation process for calculating the deflection value of the pipeline generated along the pore-forming track between the ith measurement point and the (i + j) th measurement point can be as follows: determining a change value of a hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and a linear distance between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point; calculating a deflection value between the ith measuring point and the (i + j) th measuring point according to a following formula (2) according to a change value of a hole bevel angle between the ith measuring point and the (i + j) th measuring point of a hole forming track and a linear distance between the ith measuring point and the (i + j) th measuring point;
wherein, ω is the deflection value between the ith measuring point and the (i + j) th measuring point, Δ α is the change value of the hole oblique angle of the hole forming track between the ith measuring point and the (i + j) th measuring point, Δ L is the straight line distance between the ith measuring point and the (i + j) th measuring point,
the cosine value of half of the change value of the hole oblique angle of the hole forming track between the ith measuring point and the (i + j) th measuring point is shown, and pi is the circumferential rate.
The method for determining the change value of the hole bevel angle of the hole forming track between the ith measurement point and the (i + j) th measurement point and determining the linear distance between the ith measurement point and the (i + j) th measurement point is the same as the method in step 101, and the embodiment of the invention is not repeated herein.
(2) And if the deflection value is larger than the difference value between the radius of the pore-forming track and the radius of the pipeline, determining a measurement section between the ith measurement point and the (i + j) th measurement point as a calculation section, making i equal to i +1, and returning to the step (1) of calculating the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point.
(3) If the deflection value is smaller than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, j is made to be j +1, the deflection value between the ith measurement point and the (i + j) th measurement point is calculated according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point in the step (1) until the calculated deflection value is larger than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, a measurement section between the ith measurement point and the (i + j) th measurement point is determined as a calculation section, i is made to be i + j, j is made to be 1, and the step of calculating the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point in the step (1) is returned.
That is, taking a first measuring point of the pore-forming track as a starting point of a first calculating section, calculating a deflection value between the first measuring point and a second measuring point, a deflection value between the first measuring point and a third measuring point, and a deflection value between the first measuring point and the third measuring point, and taking another measuring point corresponding to the deflection value as an end point of the calculating section until the calculated deflection value is greater than a difference value between the radius of the pore-forming track and the radius of the pipeline; then, the end point of the calculation section is used as the starting point of the next calculation section, and the steps are repeated to determine the end point of the next calculation section. And repeating the steps until the division of the n measuring points is completed.
If there are 7 measurement points at the position of the hole-forming track, which are measurement point 1, measurement point 2, measurement point 3, measurement point 4, measurement point 5, measurement point 6 and measurement point 7, respectively, the measurement point 1 is taken as the starting point of the first calculation segment, and the deflection value ω between the measurement point 1 and the measurement point 2 is calculated1If ω is1If the difference value is larger than the difference value between the radius of the pore-forming track and the radius of the pipeline, taking the measuring point 2 as the terminal point of the first calculation section; then, the measurement point 2 is used as the starting point of the second calculation section, and the deflection value ω between the measurement point 2 and the measurement point 3 is calculated2If ω is2When the difference value is less than or equal to the difference value between the radius of the pore-forming track and the radius of the pipeline, the deflection value omega between the measuring point 2 and the measuring point 4 is calculated3If ω is3Greater than the pore-forming trackIs different from the radius of the pipeline, the measuring point 4 is taken as the terminal point of the second calculation section; then, using the measurement point 4 as the starting point of the third calculation section, the deflection value ω between the measurement point 4 and the measurement point 5 is calculated4If ω is4Less than or equal to the difference between the radius of the pore-forming track and the radius of the pipe, the deflection value omega between the measuring point 4 and the measuring point 6 is calculated5If ω is5Less than or equal to the difference between the radius of the pore-forming track and the radius of the pipe, the measuring point 7 is taken as the end point of the third calculation stage.
Step 103: the correction coefficients for each of the m calculation segments are determined.
Specifically, for each of the m calculation segments, the change value of the hole-forming trajectory in the hole inclination angle between the two end points of the calculation segment and the straight-line distance between the two end points of the calculation segment are determined from the measurement data of the two end points of the calculation segment. Then, calculating a correction coefficient of the calculation section according to the diameter of the pipeline, the ratio of the diameter of the pore-forming track to the diameter of the pipeline, the change value of the pore bevel angle of the pore-forming track between the two end points of the calculation section and the linear distance between the two end points of the calculation section according to the following combined formula (3);
wherein, F is the correction coefficient of the calculation section, ω is the deflection value between two end points of the calculation section, Δ α is the variation value of the hole bevel angle between the two end points of the calculation section of the hole-forming track, Δ α' is the variation value of the hole bevel angle between the two end points of the calculation section when the pipeline drags back, Δ L is the linear distance between the two end points of the calculation section, D is the diameter of the pipeline, k is the ratio between the diameter of the hole-forming track and the diameter of the pipeline,
is the residual half of the variation value of the hole bevel angle of the hole forming track between two end points of the calculation sectionThe value of the chord is the sum of the values of the chord,
the cosine value is half of the change value of the hole inclination angle between two end points of the calculation section when the pipeline is dragged back, and pi is the circumferential rate.
Since the correction coefficient is a ratio between an actual full angle change rate when the pipe is pulled back and a theoretical full angle change rate of the hole forming track, an expression of the correction coefficient may be the following formula (4);
in which sin2αcThe mean value is the square of the sine value of the mean value of the hole bevel angle between the two end points of the calculation section of the hole forming track, the meaning of other parameters is the same as that of the corresponding parameters in the formula (3), and the embodiment of the invention is not specifically explained.
After a large amount of calculation verification, the correction coefficient is larger than 0.7, (delta phi)2sin2αcThe term has a negligible effect on the correction factor. And in real application, the correction coefficient is more than 0.7 in most cases, so the expression of the correction coefficient can be simplified to the third formula in the above joint formula (3).
Further, after the correction coefficient of each calculation section is determined, the value range of the correction coefficient, the relationship between the correction coefficient and the ratio between the diameter of the hole forming track and the diameter of the pipeline, the relationship between the correction coefficient and the theoretical variation value of the hole bevel angle, and the relationship between the correction coefficient and the linear distance between the two end points of the calculation section are introduced through the following conditions (1) to (4).
(1) The value range of the correction coefficient F is as follows:
because the curvature of the pipeline corresponding to any calculation section is smaller than the curvature of the pore-forming track, namely, the actual total angle change rate of the pipeline in the calculation section during back dragging is smaller than the theoretical total angle change rate of the pore-forming track, the correction coefficient is greater than or equal to 0 and less than or equal to 1. For a small diameter pipe, such as a pipe with a specification of D273 × 6, according to the design principle of directional drilling of the pipe, the diameter of the hole forming track is generally 1.2D, i.e. the k value is 1.2, the difference between the radius of the hole forming track and the radius of the pipe is 0.0273m, which is negligible, and the correction coefficient can be approximately 1.
When the deflection of the pore-forming track in the calculation section is just equal to the difference between the radius of the pore-forming track and the radius of the pipeline, the full-angle change rate of the pipeline in the calculation section can be approximate to 0, and therefore, the correction coefficient can be 0.
(2) The relationship between the correction factor F and the ratio k between the diameter of the pore-forming trajectory and the diameter of the pipe is:
when other conditions are unchanged, as k increases,
the larger Δ α' can be determined by the second term formula in the joint formula (3) by an iterative method, the smaller the correction coefficient can be determined by the third term formula in the joint formula (3).
(3) The relationship between the correction coefficient F and the change value Δ α of the hole inclination angle of the hole forming locus:
if the pipe specification is D813 × 10, the k value is 1.5, the hole inclination azimuth angle Δ φ value is 0, and the straight line distance Δ L value is 30 m. As shown in fig. 2, when other conditions are fixed, it can be seen through practical calculation that F increases with an increase in Δ α, and the magnitude of the increase becomes smaller and smaller.
(4) The relationship of the correction factor F to the linear distance Δ L between the two end points of the calculation segment:
if the pipeline specification is D813 multiplied by 10, the theoretical change value of the inner hole oblique angle of the calculation section is 15 degrees, the k value is 1.5 degrees, and the hole oblique azimuth angle delta phi is 0. As shown in fig. 3, when other conditions are fixed, it can be seen through practical calculation that F increases with an increase in Δ L, and the magnitude of the increase becomes smaller and smaller. When the linear distance of the calculation segment is sufficiently large, the correction coefficient may directly take 1.
Step 104: and multiplying the theoretical total angle change rate of each measuring section in the n-1 measuring sections by the correction coefficient corresponding to the calculating section where the measuring section is located respectively to obtain the actual total angle change rate of the n-1 measuring sections when the pipeline is dragged back.
Since any one of the m determined calculation segments may correspond to one measurement segment or to a plurality of measurement segments, that is, one measurement segment or a plurality of measurement segments may be included in any one of the m determined calculation segments, for each measurement segment of the n-1 measurement segments, the theoretical total angular change rate of the measurement segment may be multiplied by the correction coefficient of the corresponding calculation segment, so as to obtain the actual total angular change rate of the n-1 measurement segments when the pipeline drags back.
For example, there are 7 position measurement points of the hole-forming track, that is, the position measurement points include 6 measurement segments, and as described above, the 6 measurement segments correspond to 3 calculation segments, which are: the first measuring section corresponds to the first calculating section, the second measuring section and the third measuring section correspond to the second calculating section, and the fourth measuring section, the fifth measuring section and the sixth measuring section correspond to the third calculating section. If the theoretical total angular change rates corresponding to the 6 measurement sections are respectively 1, 0.8, 1.8, 2, 4 and 3.8, and the correction coefficients corresponding to the three calculation sections are respectively 0.8, 0.85 and 0.75, the theoretical total angular change rates of the 6 measurement sections are respectively multiplied by the correction coefficients of the corresponding calculation sections, so as to obtain the actual total angular change rates of the 6 measurement sections which are respectively 0.8, 0.68, 1.53, 1.5, 3 and 2.85.
Further, after determining the actual full angle change rate of n-1 measurement segments, the severity of the n-1 actual full angle change rates is determined as follows:
determining the back dragging force required by the pipeline according to the theoretical full-angle change rate, determining the back dragging force required by the pipeline according to the actual full-angle change rate, and determining the severity indicating value of the actual full-angle change rate according to the following formula (5) according to the back dragging force required by the pipeline under the condition of the theoretical full-angle change rate and the back dragging force required by the pipeline under the condition of the actual full-angle change rate;
wherein, TLRefers to the back drag force, T, required by the pipeline at a theoretical full angular rate of changeKThe back dragging force required by the pipeline under the condition of the actual full-angle change rate is referred, and the lambda is a severity indicating value of the actual full-angle change rate and is a dimensionless quantity.
In practical application, the value range of the severity indicating value of the actual full-angle change rate can be divided into four sub-ranges, so that the severity of the actual full-angle change rate can correspond to four severity levels. When the severity indicating value of the actual full angle change rate meets a first sub-range, determining that the severity of the actual full angle change rate is a first grade, namely a light grade, and not affecting back dragging of the pipeline; when the severity indicating value of the actual full-angle change rate meets a second sub-range, determining that the severity of the actual full-angle change rate is a second grade, namely a general grade, and realizing back dragging only by increasing back dragging force without taking other measures; when the severity indicating value of the actual full-angle change rate meets a third sub-range, determining that the severity of the actual full-angle change rate is a third grade, namely a severity grade, and realizing back dragging only after special treatment is carried out through a technical means; and when the severity indicating value of the actual full angle change rate meets a fourth sub-range, determining that the severity of the actual full angle change rate is a fourth grade, namely a particularly severe grade, and even if the severity indicating value is specially processed, realizing back dragging.
The method for determining the back dragging force required by the pipeline according to the theoretical full angle change rate and the method for determining the back dragging force required by the pipeline according to the actual full angle change rate can refer to the related technology, and the embodiment of the invention is not explained in detail.
It should be noted that the back-dragging force required for the pipeline determined under the condition of the theoretical full-angle change rate is TLWhile, the pulling force can be selected to be T0＝3TLIn the case of a drilling rig of (1), the back drag force T required for the pipe at the actual full angular rate of changeKLess than or equal to T0The back-dragging of the pipe may be successful, so the threshold value of λ may be not less than 0.33. However, the technical level of each directional drilling construction company is notSimilarly, the critical value of λ is also different and may be 0.4, that is, when λ is less than 0.4, the severity of the full-angle change rate of the pipeline is maximum and unacceptable, and belongs to the fourth grade, so that the acceptable value range of λ of 0.4-1 can be equally divided into three equal parts, and three sub-ranges are respectively obtained, with the first sub-range being 0.8-1; the second sub-range is 0.6-0.8, namely, the full angle change rate of the pipeline leads the back dragging force to be increased to 5/4-5/3 times of the ideal state; the third sub-range is 0.4-0.6, namely, the full angle change rate of the pipeline leads the back dragging force to be increased to 5/3-5/2 times of the ideal state; the fourth sub-range is 0-0.4.
For example, the required back-drag force T of the pipeline is determined as described above from the theoretical total angular rates of change 1, 0.8, 1.8, 2, 4 and 3.8 for the 6 measurement segmentsLDetermining the required back-dragging force T of the pipeline according to the actual full-angle change rates of 0.8, 0.68, 1.53, 1.5, 3 and 2.85 corresponding to the 6 measurement sectionsKCalculating lambda according to the formula (5), and if the lambda value is 0.9, determining that the severity level of the actual full-angle change rate of the pipeline is a first level; if the lambda value is 0.75, determining that the severity level of the actual full angle change rate of the pipeline is a second level; if the lambda value is 0.5, determining that the severity level of the actual full-angle change rate of the pipeline is a third level; if the lambda value is 0.3, the severity level for the actual full angular rate of change of the pipe is determined to be a fourth level.
Because the actual total angle change rate of the first-grade pipeline does not affect the back dragging of the pipeline, the first grade can be judged through a first sub-range of lambda, and can also be judged according to whether the deflection value generated by the bending deformation of the pipeline is smaller than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline or whether the deflection value generated by the bending deformation of the pipeline is smaller than or equal to the deflection value generated by the self weight of the pipeline.
Wherein, when the bending value generated according to the bending deformation of the calculation section is less than or equal to the radius of the pore-forming track and the pipeline When the difference between the radii of (1) is judged, the difference between the radii of (1) and (2) can be judgedDetermining the pore-forming track in the calculation section according to the measurement data of two end points of the calculation sectionThe change value of the hole oblique angle between the two end points and the linear distance between the two end points of the calculation section; judging according to the following formula (6) according to the ratio of the diameter of the pipeline, the diameter of the pore-forming track and the diameter of the pipeline, namely, when the condition of the formula (6) is met, determining the severity of the actual full angle change rate as a first level;
wherein, the meaning of each parameter in the formula (6) is the meaning of the corresponding parameter in the above formula (3), and the embodiment of the invention is not specifically explained.
When the deflection value generated according to the bending deformation of the pipeline is less than or equal to the deflection of the pipeline itself generated by self-weight When the value is judged, it is possible toJudging according to the change value of the hole oblique angle of the hole forming track between the two end points of the calculation section, the linear distance between the two end points of the calculation section and the deflection value generated by the self weight of the pipeline of the linear distance according to the following formula (7); that is, when the condition of formula (7) is satisfied, the severity of the actual full angle change rate is determined to be the first level;
wherein f is a deflection value of the pipeline with the length of delta L due to self weight, the meanings of other parameters in the formula (7) are the meanings of corresponding parameters in the formula (3), and the invention is not specifically explained.
The deflection value f of the pipeline due to self weight can refer to the related technology, and the invention is not elaborated in detail.
In the embodiment of the invention, in the directional drilling process of the pipeline, the theoretical total angle change rate of the pore-forming track is corrected to obtain the actual total angle change rate of the pipeline, so that the back dragging force required by back dragging the pipeline more accurately is determined, and the phenomenon that the operator generates misjudgment due to the fact that the pore-forming track determines larger back dragging force is avoided.
Referring to fig. 4, an embodiment of the present invention provides an apparatus for determining a full angular rate of change of a track traversed by directional drilling of a pipeline, the apparatus including:
the first determining module 401 is configured to determine a theoretical total angular rate of change of a measurement segment between every two adjacent measurement points in n measurement points of the pore-forming track, to obtain a theoretical total angular rate of change of n-1 measurement segments, where the n measurement points are position points where the pore-forming track is measured during the directional drilling of the pipeline.
A second determining module 402 for determining m calculation segments from the n-1 measurement segments, m being smaller than n.
A third determining module 403, configured to determine a correction coefficient for each of the m computing sections.
And the operation module 404 is configured to multiply the theoretical total angular change rate of each measurement segment in the n-1 measurement segments by the correction coefficient corresponding to the calculation segment where the measurement segment is located, so as to obtain the actual total angular change rate of the n-1 measurement segments when the pipeline is pulled back.
In the embodiment of the invention, the theoretical total angle change rate of the pore-forming track is corrected to obtain the actual total angle change rate of the pipeline during back dragging, so that the back dragging force required by the pipeline back dragging can be determined more accurately, the severity of the actual total angle change rate phenomenon during the back dragging of the pipeline is analyzed in advance, and the occurrence of pipe clamping accidents caused by the fact that the total angle change rate phenomenon is too severe during the back dragging of the pipeline is avoided.
Optionally, the second determining module 402 includes:
and the first calculation submodule is used for enabling i to be 1 and j to be 1, calculating a deflection value generated by the pipeline between the ith measurement point and the (i + j) th measurement point along the pore-forming track according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point in the n measurement points, and enabling i + j to be less than or equal to n.
And the first determining submodule is used for determining a measuring section between the ith measuring point and the (i + j) th measuring point as a calculating section if the deflection value is larger than the difference value between the radius of the pore-forming track and the radius of the pipeline, making i equal to i +1, and returning to the step of calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point.
And a second determining submodule, configured to, if the deflection value is smaller than or equal to a difference between the radius of the pore-forming track and the radius of the pipeline, make j equal to j +1, return to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point, calculate a deflection value between the ith measurement point and the (i + j) th measurement point, determine a measurement section between the ith measurement point and the (i + j) th measurement point as a calculation section until the calculated deflection value is greater than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, make i equal to i + j, j equal to 1, and return to the step of calculating the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point.
Optionally, the first computing submodule is specifically configured to:
and determining a theoretical change value of the hole oblique angle between the ith measuring point and the (i + j) th measuring point and a linear distance between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point.
According to the theoretical change value of the hole oblique angle between the ith measuring point and the (i + j) th measuring point and the linear distance between the ith measuring point and the (i + j) th measuring point, calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the following formula;
wherein, ω is the deflection value between the ith measuring point and the (i + j) th measuring point, Δ α is the theoretical variation value of the hole oblique angle of the hole forming track between the ith measuring point and the (i + j) th measuring point, and Δ L is the linear distance between the ith measuring point and the (i + j) th measuring point.
Optionally, the third determining module 403 includes:
and the third determining submodule is used for determining the theoretical change value of the hole bevel angle between the two end points of the calculation section and the straight-line distance between the two end points of the calculation section according to the measurement data of the two end points of the calculation section for each calculation section in the m calculation sections.
The second calculation submodule is used for calculating the correction coefficient of the calculation section according to the following combined formula according to the diameter of the pipeline, the ratio of the diameter of the pore-forming track to the diameter of the pipeline, the theoretical change value of the pore bevel angle between the two end points of the calculation section and the linear distance between the two end points of the calculation section;
wherein, F is a correction coefficient of the calculation section, ω is a deflection value between two end points of the calculation section, Δ α is a theoretical variation value of a hole bevel angle between the two end points of the calculation section of the hole-forming track, Δ α' is an actual variation value of the hole bevel angle between the two end points of the calculation section when the pipeline drags back, Δ L is a linear distance between the two end points of the calculation section, D is a diameter of the pipeline, and k is a ratio between the diameter of the hole-forming track and the diameter of the pipeline.
In the embodiment of the invention, in the directional drilling process of the pipeline, the theoretical total angle change rate of the pore-forming track is corrected to obtain the actual total angle change rate of the pipeline, so that the back dragging force required by back dragging the pipeline more accurately is determined, and the phenomenon that the operator generates misjudgment due to the fact that the pore-forming track determines larger back dragging force is avoided.
It should be noted that: the device for determining the total angular change rate of the pipeline directional drilling crossing track provided by the above embodiment is only illustrated by the division of the above functional modules when determining the actual total angular change rate of the pipeline during back dragging, and in practical application, the above function distribution can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. In addition, the device for determining the total angular change rate of the pipeline provided by the above embodiment and the method for determining the total angular change rate of the pipeline belong to the same concept, and the specific implementation process thereof is described in the method embodiment and is not described herein again.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for determining the full angular rate of change of a track traversed by a directional drilling of a pipeline, the method comprising:
determining the theoretical total angle change rate of a measuring section between every two adjacent measuring points in n measuring points of a pore-forming track to obtain the theoretical total angle change rate of n-1 measuring sections, wherein the n measuring points are position points for measuring the pore-forming track in the process of performing directional drilling on a pipeline;
determining m calculation segments from the n-1 measurement segments, the m being less than the n;
determining a correction factor for each of the m computation segments;
multiplying the theoretical total angle change rate of each measuring section in the n-1 measuring sections by the correction coefficient corresponding to the calculating section where the measuring section is located respectively to obtain the actual total angle change rate of the n-1 measuring sections when the pipeline is dragged back;
wherein said determining m computation segments from said n-1 measurement segments comprises: calculating a deflection value of the pipeline between the ith measuring point and the (i + j) th measuring point along the hole forming track according to the measuring data of the ith measuring point and the (i + j) th measuring point in the n measuring points, wherein i is 1, and j is 1, and i + j is less than or equal to n; if the deflection value is larger than the difference value between the radius of the pore-forming track and the radius of the pipeline, determining a measuring section between the ith measuring point and the (i + j) th measuring point as a calculating section, making i equal to i +1, and returning to the step of calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point; if the deflection value is smaller than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, the step of enabling j to be j +1, returning measurement data of the ith measurement point and measurement data of the (i + j) th measurement point, calculating the deflection value between the ith measurement point and the (i + j) th measurement point until the calculated deflection value is larger than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, determining a measurement section between the ith measurement point and the (i + j) th measurement point as a calculation section, enabling i to be i + j, j to be 1, and returning the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point;
wherein the determining the correction factor for each of the m computation segments comprises: for each calculation section in the m calculation sections, determining a change value of a hole bevel angle of the hole forming track between two end points of the calculation section and a linear distance between the two end points of the calculation section according to measurement data of the two end points of the calculation section; calculating a correction coefficient of the calculation section according to the diameter of the pipeline, the ratio of the diameter of the pore-forming track to the diameter of the pipeline, the change value of the pore bevel angle of the pore-forming track between the two end points of the calculation section and the linear distance between the two end points of the calculation section by using a combined formula as follows;
wherein, F refers to a correction coefficient of the calculation section, ω refers to a deflection value between two end points of the calculation section, Δ α refers to a change value of a hole oblique angle of the hole forming track between the two end points of the calculation section, Δ α' refers to a change value of a hole oblique angle between the two end points of the calculation section when the pipe is pulled back, Δ L refers to a linear distance between the two end points of the calculation section, D refers to a diameter of the pipe, and k refers to a ratio between the diameter of the hole forming track and the diameter of the pipe.
2. The method according to claim 1, wherein calculating the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point comprises:
determining a change value of a hole bevel angle between the ith measuring point and the (i + j) th measuring point of the hole forming track and a straight-line distance between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point;
according to the change value of the hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and the linear distance between the ith measuring point and the (i + 1) th measuring point, calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the following formula;
wherein ω is a deflection value between the ith measurement point and the (i + j) th measurement point, Δ α is a variation value of a hole bevel angle of the hole forming track between the ith measurement point and the (i + j) th measurement point, and Δ L is a linear distance between the ith measurement point and the (i + j) th measurement point.
3. An apparatus for determining the rate of change of the through angle of a trajectory traversed by a directional drill of a pipe, the apparatus comprising:
the device comprises a first determining module, a second determining module and a control module, wherein the first determining module is used for determining the theoretical total angle change rate of a measuring section between every two adjacent measuring points in n measuring points of a pore-forming track to obtain the theoretical total angle change rate of n-1 measuring sections, and the n measuring points are position points for measuring the pore-forming track in the process of directional drilling of a pipeline;
a second determining module for determining m calculation segments from the n-1 measurement segments, the m being smaller than the n;
a third determining module, configured to determine a correction coefficient for each of the m computation segments;
the operation module is used for multiplying the theoretical total angle change rate of each measuring section in the n-1 measuring sections by the correction coefficient corresponding to the calculating section where the measuring section is located respectively to obtain the actual total angle change rate of the n-1 measuring sections when the pipeline is dragged back;
wherein the second determining module comprises: the first calculation submodule is used for enabling i to be 1 and j to be 1, calculating a deflection value of the pipeline between the ith measurement point and the (i + j) th measurement point along the pore-forming track according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point in the n measurement points, wherein the i + j is less than or equal to the n; a first determining submodule, configured to determine, if the deflection value is greater than a difference between a radius of the pore-forming trajectory and a radius of the pipeline, a measurement segment between the ith measurement point and the (i + j) th measurement point as a calculation segment, make i ═ i +1, and return to a step of calculating a deflection value between the ith measurement point and the (i + j) th measurement point according to measurement data of the ith measurement point and measurement data of the (i + j) th measurement point; a second determining submodule for determining if said deflection value is less than or equal to a difference between a radius of said bore forming trajectory and a radius of said pipe, then, when j is equal to j +1, returning to calculate the deflection value between the ith measurement point and the (i + j) th measurement point according to the measurement data of the ith measurement point and the measurement data of the (i + j) th measurement point until the calculated deflection value is greater than or equal to the difference between the radius of the pore-forming track and the radius of the pipeline, determining a measurement segment between the ith measurement point and the (i + j) th measurement point as a calculation segment, and setting i to i + j and j to 1, and returning to the step of calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point;
wherein the third determining module comprises: the third determining submodule is used for determining a change value of a hole bevel angle of the hole forming track between two end points of the computing section and a straight-line distance between the two end points of the computing section according to the measurement data of the two end points of the computing section for each computing section in the m computing sections; the second calculation submodule is used for calculating the correction coefficient of the calculation section according to the following combined formula according to the diameter of the pipeline, the ratio of the diameter of the pore-forming track to the diameter of the pipeline, the change value of the pore oblique angle of the pore-forming track between the two end points of the calculation section and the linear distance between the two end points of the calculation section;
wherein, F refers to a correction coefficient of the calculation section, ω refers to a deflection value between two end points of the calculation section, Δ α refers to a change value of a hole oblique angle of the hole forming track between the two end points of the calculation section, Δ α' refers to a change value of a hole oblique angle between the two end points of the calculation section when the pipe is pulled back, Δ L refers to a linear distance between the two end points of the calculation section, D refers to a diameter of the pipe, and k refers to a ratio between the diameter of the hole forming track and the diameter of the pipe.
4. The apparatus of claim 3, wherein the first computation submodule is specifically configured to:
determining a change value of a hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and a straight-line distance between the ith measuring point and the (i + j) th measuring point according to the measuring data of the ith measuring point and the measuring data of the (i + j) th measuring point;
according to the change value of the hole bevel angle of the hole forming track between the ith measuring point and the (i + j) th measuring point and the linear distance between the ith measuring point and the (i + j) th measuring point, calculating the deflection value between the ith measuring point and the (i + j) th measuring point according to the following formula;
wherein ω is a deflection value between the ith measurement point and the (i + j) th measurement point, Δ α is a variation value of a hole bevel angle of the hole forming track between the ith measurement point and the (i + j) th measurement point, and Δ L is a linear distance between the ith measurement point and the (i + j) th measurement point.
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