CN111042795A - Calculating method for scanning normal surface distance of adjacent well - Google Patents
Calculating method for scanning normal surface distance of adjacent well Download PDFInfo
- Publication number
- CN111042795A CN111042795A CN201811188834.4A CN201811188834A CN111042795A CN 111042795 A CN111042795 A CN 111042795A CN 201811188834 A CN201811188834 A CN 201811188834A CN 111042795 A CN111042795 A CN 111042795A
- Authority
- CN
- China
- Prior art keywords
- well
- comparison
- point
- points
- normal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- E21B47/00—Survey of boreholes or wells
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
Abstract
The invention provides a resolving method for scanning the normal face distance of an adjacent well, which comprises the following steps: obtaining the inclination measurement data of the reference well and the comparison well, and calculating well hole tracks of the reference well and the comparison well; the reference well and the comparison well are reduced to the same coordinate system, and the scanning range is determined according to the well depth interval of the reference well; selecting a reference point in a scanning range, establishing a normal plane, and scanning each measurement section of the comparison well; when the normal plane intersects with any measuring section of the comparison well, calculating and storing track parameters of intersection points, and taking the intersection points as alternative comparison points; and determining a comparison point according to the nearest distance to the reference point based on the alternative comparison points, and calculating the normal distance and the scanning angle between the reference point and the comparison point so as to represent the relative position relationship between the reference point and the comparison point and be used for the adjacent well anti-collision evaluation. The method solves the problems that in the prior art, collision-prevention danger points of adjacent wells are possibly omitted, an analytic method is only suitable for space circular arc tracks and the like, and provides the method for calculating the normal surface distance of the adjacent wells, which has strong applicability and high reliability.
Description
Technical Field
The invention relates to the field of oil and gas well engineering, in particular to a calculating method for scanning the normal surface distance of an adjacent well.
Background
In order to meet the requirements of oil reserves and output, old oil fields continuously pack well spacing to dig and submerge residual oil, unconventional oil and gas resource development is developing branch wells, fishbone wells and well factory technologies, and the number of single-platform well arrangements for offshore drilling is increasing to form high-density cluster wells. With the increasing of well arrangement density, the distance between adjacent wells is smaller and smaller, so the problem of collision prevention of the adjacent wells is more and more prominent.
The method comprises the following steps of scanning the adjacent well by using a normal plane of a reference well to obtain the distance between the reference well and the adjacent well, and further evaluating whether the reference well and the adjacent well collide or whether the collision risk exists. The traditional adjacent well normal surface distance scanning method can only identify the condition that adjacent measuring points on adjacent wells are positioned on different sides of the normal surface, cannot identify the condition that the adjacent measuring points on the adjacent wells are positioned on the same side of the normal surface, and has the problem that collision prevention danger points of the adjacent wells can be omitted. To solve this problem, there is currently an analytic method of distance scanning of the normal surface of the adjacent well. However, the analytical method is only suitable for the spatial circular arc-shaped borehole trajectory, and is not suitable for borehole trajectories of other shapes. Therefore, a general resolving method for distance scanning of the normal surface of the adjacent well needs to be established to make up for the defects of the prior art.
Accordingly, the present invention provides a solution for scanning the distance to the normal of an adjacent well.
Disclosure of Invention
In order to solve the above problems, the present invention provides a solution method for scanning the normal distance of an adjacent well, comprising the following steps:
adopting a measuring instrument to obtain inclination measurement data of a reference well and a comparison well according to industrial regulations, and calculating well hole tracks of the reference well and the comparison well based on the inclination measurement data, wherein the reference well is a newly designed well or a drilling well, and the comparison well is a well drilled nearby the reference well;
the reference well and the comparison well are reduced to the same coordinate system, and the scanning range is determined according to the well depth interval of the reference well;
selecting a reference point in the scanning range of the reference well, establishing a normal plane based on the reference point, scanning each measurement section of the comparison well, and judging whether the normal plane and the comparison well are intersected;
when the normal plane intersects with any measuring section of the comparison well, calculating and storing track parameters of intersection points, and taking the intersection points as alternative comparison points;
and determining comparison points based on the alternative comparison points, and calculating the normal distance and the scanning angle between the reference point and the comparison points to represent the relative position relationship between the reference point and the comparison points for the adjacent well anti-collision evaluation.
According to an embodiment of the present invention, in the step of assigning the reference well and the comparison well to the same coordinate system, the method further comprises:
and the same coordinate system adopts a wellhead coordinate system of the reference well, and the north coordinate axis of the wellhead coordinate system points to the true north or grid north direction.
According to an embodiment of the present invention, in the step of establishing the normal plane based on the reference point, the method further includes:
at the reference point P, a normal plane is established perpendicular to the tangent of the reference well, and the equation of the normal plane is obtained as follows:
(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP＝0
wherein N, E and H are north, east and vertical coordinates, respectively, in meters, α and phi are inclination and azimuth, respectively, in (°), and P is a reference point.
According to an embodiment of the present invention, in the step of determining whether the normal plane intersects with the comparison well, the method further includes:
judging whether the normal plane intersects with the comparison well or not through the following equation:
f(L)＝(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP
wherein: l is the well depth of the comparison well, unit: rice;
in the log section [ L ] of the comparison welli-1,Li]In, if any point Q satisfies f (L)Q) If the comparison result is 0, intersecting, and recording the intersection point Q as an alternative comparison point; otherwise, it is disjoint. Wherein L isi-1Indicating the well depth at the starting point of the survey section, LiIndicating the well depth at which the log ends.
According to an embodiment of the present invention, in the step of determining whether the normal plane intersects with the comparison well, the method further includes:
log [ L ] based on the comparison welli-1,Li]Two end points of (d), calculating f (L)i-1) And f (L)i) Value, by f (L)i-1) And f (L)i) Judging whether the normal plane intersects with the comparison well:
s1, if f (L)i-1)·f(Li) If the value is less than or equal to 0, the measuring section [ L ] is determinedi-1,Li]Is located on the opposite side of the normal plane to the measurement section [ L ]i-1,Li]Intersecting, and determining alternative comparison points by adopting a bisection method, a Newton method and a chord section method;
s2, if f (L)i-1)·f(Li)>0, then the measuring section [ L ]i-1,Li]Is located on the same side of the normal plane, the normal plane and the measuring section [ L ]i-1,Li]There is no intersection point or one intersection point or two intersection points, wherein the normal plane and the measuring section [ L ]i-1,Li]The requirement that there be one intersection or two intersections is: there is a certain point C in the segment under test, satisfying the following formula:
f′(LC)＝0
and, the normal plane and the measuring section [ L ]i-1,Li]A sufficient condition for the presence of one intersection or the presence of two intersections is that the following formula is satisfied:
if the necessary condition and the sufficient condition are simultaneously satisfied, the normal plane and the measuring section [ L ]i-1,Li]There is one intersection or two intersections, and 2 sub-well sections [ L ] are calculated using the method described in step S1i-1,LC]And [ LC,Li]Selecting a point closest to the reference point space as a candidate comparison point;
s3, when the measuring section [ L ]i-1,Li]When it is a straight line segment, if f (L)i-1)·f(Li) If the normal plane is less than or equal to 0, intersecting the measuring section, otherwise, not intersecting; when f (L) is not equal to 0, the section [ L ≡ 0-i-1,Li]And selecting a point closest to the reference point in space distance as a candidate comparison point in the normal plane.
According to an embodiment of the present invention, in the step of determining a comparison point based on the alternative comparison points, the method further includes:
and based on the alternative comparison points of each measurement section of the comparison well, taking the alternative comparison point closest to the reference point space distance as a comparison point, and calculating the normal surface distance and the scanning angle between the reference point and the comparison point for the adjacent well anti-collision evaluation.
The calculating method for scanning the normal distance of the adjacent well solves the problems that collision prevention danger points of the adjacent well can be omitted, an analytic method is only suitable for a space circular arc track and the like in the prior art, and is high in applicability and reliability.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow diagram of a solution method for scanning distance to the normal of an adjacent borehole according to one embodiment of the present invention;
FIG. 2 shows a flow diagram of a solution method for scanning distance to the normal of an adjacent borehole according to another embodiment of the present invention;
FIG. 3 shows a scanning schematic of a solution method for scanning distance to a normal surface of an adjacent well according to an embodiment of the invention;
FIG. 4 shows a schematic diagram of a solution method for scanning distance to a normal surface of an adjacent well according to an embodiment of the invention; and
FIG. 5 shows a near-normal distance scan of a solution for scanning near-normal distances according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Aiming at the defects in the prior art, the invention discloses a calculating method for scanning the normal distance of an adjacent well, which solves the problem that the collision prevention danger points of the adjacent well may be omitted in the traditional technology, breaks through the limitation that the existing analytic method is only suitable for a space circular arc track, and provides the normal distance calculating method of the adjacent well with strong applicability and high reliability for the collision prevention evaluation of the adjacent well.
FIG. 1 shows a flow diagram of a solution method for scanning distance to the normal of an adjacent borehole according to one embodiment of the present invention.
As shown in fig. 1, in step S101, inclination data of a reference well and a comparison well are obtained by using a measuring instrument according to an industry protocol, and wellbore trajectories of the reference well and the comparison well are calculated based on the inclination data, wherein the reference well is a newly designed well or a drilling well, and the comparison well is a drilled well adjacent to the reference well.
Then, in step S102, the reference well and the comparison well are classified into the same coordinate system, and the scanning range is determined according to the well depth interval of the reference well. According to one embodiment of the invention, the same coordinate system is used for the wellhead coordinate system of the reference well, and the north coordinate axis of the wellhead coordinate system points in the true north or grid north direction.
After the scanning range is determined, in step S103, a reference point is selected from the scanning range of the reference well, a normal plane is established based on the reference point, each measurement section of the comparison well is scanned, and whether the normal plane intersects the comparison well is determined. According to one embodiment of the invention, at reference point P, a normal plane is established perpendicular to the tangent of the reference well, resulting in the equation for the normal plane as follows:
(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP＝0
wherein N, E and H are north, east and vertical coordinates, respectively, in meters, α and phi are inclination and azimuth, respectively, in (°), and P is a reference point.
Next, in step S104, when the normal plane intersects any of the measurement sections of the comparison well, the trajectory parameters of the intersection point are calculated and saved, and the intersection point is used as an alternative comparison point. According to one embodiment of the invention, it is determined whether the normal plane intersects the comparison well by the following equation:
f(L)＝(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP
wherein: l is the well depth of the comparison well, unit: rice;
in the log section [ L ] of the comparison welli-1,Li]In, if any point Q satisfies f (L)Q) If the point is 0, the points are crossed, and the intersection point Q is recorded as an alternative comparison point; otherwise, it is disjoint, where Li-1Indicating the well depth at the starting point of the survey section, LiIndicating the well depth at which the log ends.
In addition, the log [ L ] is based on a comparison welli-1,Li]Two end points of (d), calculating f (L)i-1) And f (L)i) Value, by f (L)i-1) And f (L)i) Judging whether the normal plane intersects with the comparison well:
s1, if f (L)i-1)·f(Li) Measuring the section [ L ] when the value is less than or equal to 0i-1,Li]Is located on the opposite side of the normal plane to the measuring section [ L ]i-1,Li]And intersecting, and determining alternative comparison points by adopting a bisection method, a Newton method and a chord section method.
S2, if f (L)i-1)·f(Li)>0, then measure the section [ Li-1,Li]The two end points are located on the same side of the normal plane, and the normal plane and the measuring section [ L ]i-1,Li]There being no point of intersection or one point of intersection or two points of intersection, wherein the normal plane and the measuring section [ L ]i-1,Li]The requirement that there be one intersection or two intersections is: there is a certain point C in the survey section, satisfying the following formula:
f′(LC)＝0
and, the normal plane and said measuring section [ L ]i-1,Li]A sufficient condition for the presence of one intersection or the presence of two intersections is that the following formula is satisfied:
if necessary conditions and sufficient conditions are satisfied simultaneously, normal plane and measuring section [ L ]i-1,Li]There is one intersection or two intersections, and 2 sub-well sections [ L ] are calculated respectively by the method in step S1i-1,LC]And [ LC,Li]And selecting the point closest to the reference point in space as the alternative comparison point.
S3, current measuring segment [ Li-1,Li]When it is a straight line segment, if f (L)i-1)·f(Li) If the normal plane is less than or equal to 0, intersecting the measuring section, otherwise, not intersecting; when f (L) is not equal to 0, measure segment [ L ≡ 0i-1,Li]And selecting a point closest to the reference point in space distance as a candidate comparison point in the normal plane.
Finally, in step S105, a comparison point is determined based on the candidate comparison points, and a normal distance and a scanning angle between the reference point and the comparison point are calculated to represent a relative position relationship between the reference point and the comparison point for the adjacent well anti-collision evaluation. According to one embodiment of the invention, based on the alternative comparison points of each measurement section of the comparison well, the point closest to the reference point in space distance is used as the comparison point, and the normal distance and the scanning angle between the reference point and the comparison point are calculated for the adjacent well anti-collision evaluation.
FIG. 2 shows a flow diagram of a solution method for scanning distance to the normal of an adjacent borehole according to another embodiment of the present invention.
As shown in fig. 2, in step S201, wellbore trajectory data is acquired. The newly designed or drilling well is used as a reference well and the nearby drilled neighboring well is used as a comparison well. And acquiring the inclination measurement data of the reference well and the comparison well by using a measuring instrument, and calculating parameters such as space coordinates of each measuring point according to an industrial standard.
In step S202, the north direction and the coordinate system are unified. The reference well and the comparison well have respective wellhead coordinate systems, the respective wellheads are respectively used as coordinate origins, and 3 coordinate axes of the wellhead coordinate systems respectively point to the north coordinate, the east coordinate and the vertical depth (vertical downward) direction. The petroleum drilling relates to 3 north-seeking directions such as true north, grid north, magnetic north and the like, wherein the true north is generally used as a north-seeking reference to determine the directions of a north coordinate axis and an east coordinate axis, and the grid north can also be used as the north-seeking reference.
When the normal surface distance of the adjacent well is scanned, the reference well and the comparison well must be unified to the same coordinate system, and then normal surface scanning and distance calculation can be carried out. Generally, the coordinate system is the wellhead coordinate system of the reference well, so that the comparison well only needs to be converted into the wellhead coordinate system of the reference well, and the reference well does not need to be converted.
In step S203, the scanning range and pitch are determined. Typically, only a portion of the interval is at risk of collision with an adjacent well, so scanning is not required over the full well trajectory of the reference well. To avoid unnecessary redundant calculations, the scan range is often defined by a well depth interval of the reference well.
To avoid the risk of collision between adjacent wells, it is often necessary to encrypt the calculated points on the reference well. The method for encrypting the computing point comprises the following steps: and interpolating the well depth according to the scanning interval requirement on any measurement section of the reference well, and calculating parameters such as a well inclination angle, an azimuth angle, a space coordinate and the like of an interpolation point.
In step S204, a reference point is selected and a normal plane is established. And selecting a point P as a reference point on the reference well passing through the encryption calculation point. As shown in fig. 3. Establishing a normal plane through the reference point P, so that the normal plane is perpendicular to the tangential direction of the reference well, and the equation of the normal plane is as follows:
(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP＝0(1)
wherein N is north coordinate, m, E is east coordinate, m, H is vertical depth coordinate, m, α is well angle, (°), phi is azimuth angle, (°), and P is reference point.
In step S205, any log segment of the adjacent well is scanned to obtain an alternative comparison point. The normal at reference point P may or may not intersect the comparison well, and there may be multiple intersections. To identify the various conditions, each log of the comparison well needs to be scanned.
For any log [ L ] of the comparison welli-1,Li]Judging whether the reference normal plane intersects with the comparison well by the following method:
order:
f(L)＝(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP(2)
wherein: l is the well depth of the comparison well, m.
Thus, if the log [ L ] of the comparison well is ini-1,Li]There is a certain point in memory Q that satisfies f (L)Q) If the value is 0, the intersection is performed; otherwise, it is disjoint. This intersection point Q is referred to as an alternative comparison point, since it may or may not be the final comparison point.
After the reference point P is selected, its trajectory parameters (α)P,φP,NP,EP,HP) Is the known data. Since the spatial coordinates (N, E, H) of the comparison well all vary with well depth L, f (L) is a function of the comparison well depth L as an argument. Given a comparison well depth L, the value of the function f (L) can be calculated.
In order to determine whether the reference normal plane intersects the comparison well or not and whether a plurality of intersection points exist, the comparison well is measuredi-1,Li]The two end points of (2) are substituted into formula (2), and f (L) can be calculatedi-1) And f (L)i) The value is obtained. Thus, co-exist in f (L)i-1)·f(Li) 0 or less and f (L)i-1)·f(Li)>0, and some special cases need to be handled.
In step S2051, if f (L)i-1)·f(Li) And if the value is less than or equal to 0, the two end points of the measuring section are positioned on the opposite side of the normal surface. Because the well track has the characteristic of continuous smoothness, the measuring section Li-1,Li]There must be some point within Q that satisfies f (L)Q) 0. And solving the formula (2) by adopting iterative calculation methods such as a dichotomy method, a Newton method, a chord section method and the like, so as to determine the alternative comparison points.
In step S2052, if f (L)i-1)·f(Li)>And 0, indicating that the two end points of the measuring section are positioned on the same side of the normal surface. As shown in fig. 4. Since the well track has single convexity, in the survey section Li-1,Li]There are 3 cases of no intersection point, 1 intersection point (when the normal surface is tangent to the comparison well logging segment) or 2 intersection points in the interior, namely 0-2 intersection points.
To identify the above 3 cases, the comparative well depth L is derived from equation (2) to obtain:
f′(L)＝cosαcosαP+sinαsinαPcos(φ-φP)(3)
thus, the requirements for the reference well face to intersect the comparison well are: in the measuring section [ L ]i-1,Li]There is some point C in memory, satisfying:
f′(LC)＝0(4)
formula (4) illustrates: unit tangent vector t at point C on the comparison wellCUnit tangent vector t perpendicular to reference pointPI.e. vector tCParallel to the reference well normal.
And the sufficient condition that the reference well normal surface intersects with the comparison section is as follows:
therefore, when f (L)i-1)·f(Li)>When 0, first, the formula (4) is used to calculate LCAnd then the formula (5) is used to distinguish the reference well normal surface and the comparison well logging section [ Li-1,Li]Whether or not to intersect. If equation (5) is satisfied, it indicates an intersection, i.e., there is a certain point C in the comparison interval, which is divided into 2 sub-intervals [ L [ ]i-1,LC]And [ LC,Li]. There are 1 intersection points in each sub-well, and these 2 intersection points can be determined by the method of step S2051 and used as alternative comparison points.
In step S2053, two special cases need to be handled in addition to step S2051 and step S2052. Firstly, the method comprises the following steps: when comparing well log segments [ L ]i-1,Li]In the case of a straight line segment, f' (L) is a constant, so f (L) is a monotonic function. At this time, if f (L)i-1)·f(Li) If the standard surface of the reference point is less than or equal to 0, intersecting the comparative well logging section, otherwise, not intersecting; secondly, the method comprises the following steps: when f (L) is equal to 0, the well logging section [ L ] is comparedi-1,Li]Located within the normal to the reference point. At the moment, a plurality of intersection points exist between the reference point normal surface and the comparison well measuring section, and from the perspective of collision prevention of adjacent wells, the closest point to the reference point P is taken as an alternative comparison point.
In step S206, a comparison point is determined based on the alternative comparison points. For the selected reference point P, after scanning the comparison wells segment by segment in step S205, there are only 2 results, i.e., the presence or absence of the alternative comparison point, on each segment. If no alternative comparison point exists on each measurement section, the fact that the normal surface at the reference point P is not intersected with the comparison well is shown, namely no comparison point exists; if the candidate comparison points exist on the plurality of measurement sections, the normal plane at the reference point P is intersected with the plurality of measurement sections of the comparison well, and the closest point to the reference point P is taken as the comparison point.
For the reference point P, if there is a comparison point, parameters such as the distance between the two points and the scan angle can be calculated, and the calculation result is saved.
In step S207, a result chart is output. And (4) for all the reference points, after scanning is finished according to the steps S204-S206, obtaining results such as normal distance and mutual position relation between the reference well and the comparison well, and further outputting the scanning results in forms such as reports, drawings and the like, so that the adjacent well collision prevention evaluation can be carried out.
FIG. 5 shows a near-normal distance scan of a solution for scanning near-normal distances according to an embodiment of the invention.
Old oil fields continuously build up well spacing to dig and submerge residual oil, unconventional oil and gas resource development is developing branch wells, fishbone wells and well factory technology, and the number of single-platform well arrangements for offshore drilling is increasing to form high-density cluster wells. With the continuous increase of the well spacing density, the distance between adjacent wells is smaller and smaller, and the problem of collision prevention of the adjacent wells is more and more prominent, so that the invention has wide application prospect.
In one embodiment, a vertical well is newly designed, and a drilled horizontal well is nearby. The horizontal well has north coordinates of-40 m and east coordinates of-400 m relative to the new well, and the wellbore trajectory data are shown in table 1. At present, a vertical well is used as a reference well, a drilled horizontal well is used as a comparison well, and a normal distance scanning method is used for carrying out adjacent well anti-collision analysis.
TABLE 1 comparative well trajectory data for the examples
| Well depth (m) | Oblique angle (degree) | Azimuth (°) | North coordinate (m) | East coordinate (m) | Vertical depth (m) |
| 0.00 | 0.00 | / | 0.00 | 0.00 | 0.00 |
| 1400.00 | 0.00 | (90.00) | 0.00 | 0.00 | 1400.00 |
| 1560.00 | 50.00 | 90.00 | 0.00 | 65.49 | 1540.45 |
| 1720.00 | 50.00 | 90.00 | 0.00 | 188.06 | 1643.30 |
| 1920.00 | 106.00 | 90.00 | 0.00 | 376.00 | 1683.24 |
| 2000.00 | 88.00 | 90.00 | 0.00 | 455.07 | 1673.53 |
| 2100.00 | 76.00 | 90.00 | 0.00 | 553.92 | 1687.43 |
| 2350.00 | 80.00 | 90.00 | 0.00 | 798.41 | 1739.39 |
Fig. 5 shows a schematic representation of the relative positions of the reference well and the comparison well in a vertical plane at 90 deg. azimuth. According to the technical method and the flow, normal surface distance scanning is carried out according to the step length of 1m within the range of 1670 m-1695 m of the well depth of the reference well, and the scanning result is shown in a table 2.
TABLE 2 results of normal range scanning of the examples
The embodiment covers the conditions that two end points of the comparison well section are positioned on the same side and the different side of the reference well normal surface, a plurality of intersection points exist between the reference well normal surface and a single measurement section of the comparison well, the intersection points are intersected in the plurality of measurement sections, and the like, so that the universal applicability of the invention is verified.
The calculating method for scanning the normal distance of the adjacent well solves the problems that collision prevention danger points of the adjacent well can be omitted, an analytic method is only suitable for a space circular arc track and the like in the prior art, and is high in applicability and reliability.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A solution method for scanning the distance to the normal of an adjacent well, the method comprising the steps of:
adopting a measuring instrument to obtain inclination measurement data of a reference well and a comparison well according to industrial regulations, and calculating well hole tracks of the reference well and the comparison well based on the inclination measurement data, wherein the reference well is a newly designed well or a drilling well, and the comparison well is a well drilled nearby the reference well;
the reference well and the comparison well are reduced to the same coordinate system, and the scanning range is determined according to the well depth interval of the reference well;
selecting a reference point in the scanning range of the reference well, establishing a normal plane based on the reference point, scanning each measurement section of the comparison well, and judging whether the normal plane and the comparison well are intersected;
when the normal plane intersects with any measuring section of the comparison well, calculating and storing track parameters of intersection points, and taking the intersection points as alternative comparison points;
and determining comparison points based on the alternative comparison points, and calculating the normal distance and the scanning angle between the reference point and the comparison points to represent the relative position relationship between the reference point and the comparison points for the adjacent well anti-collision evaluation.
2. A solution method for scanning distance to the normal of an adjacent well according to claim 1, wherein in the step of attributing the reference well and the comparison well to the same coordinate system, further comprising:
and the same coordinate system adopts a wellhead coordinate system of the reference well, and the north coordinate axis of the wellhead coordinate system points to the true north or grid north direction.
3. A solution method for scanning distance to the normal of an adjacent well according to claim 2, wherein in the step of establishing a normal plane based on the reference point, further comprising:
at the reference point P, a normal plane is established perpendicular to the tangent of the reference well, and the equation of the normal plane is obtained as follows:
(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP＝0
wherein N, E and H are north, east and vertical coordinates, respectively, in meters, α and phi are inclination and azimuth, respectively, in (°), and P is a reference point.
4. The method of claim 3, wherein the step of determining whether the normal plane intersects the comparison well further comprises:
judging whether the normal plane intersects with the comparison well or not through the following equation:
f(L)＝(N-NP)sinαPcosφP+(E-EP)sinαPsinφP+(H-HP)cosαP
wherein: l is the well depth of the comparison well, unit: rice;
in the log section [ L ] of the comparison welli-1,Li]In, if any point Q satisfies f (L)Q) If the comparison result is 0, intersecting, and recording the intersection point Q as an alternative comparison point; otherwise, it is disjoint, where Li-1Indicating the well depth at the starting point of the survey section, LiIndicating the well depth at which the log ends.
5. The method of claim 4, wherein the step of determining whether the normal plane intersects the comparison well further comprises:
log [ L ] based on the comparison welli-1,Li]Two end points of (d), calculating f (L)i-1) And f (L)i) Value, by f (L)i-1) And f (L)i) Judging whether the normal plane intersects with the comparison well:
s1, if f (L)i-1)·f(Li) If the value is less than or equal to 0, the measuring section [ L ] is determinedi-1,Li]Is located on the opposite side of the normal plane to the measurement section [ L ]i-1,Li]Intersecting, and determining alternative comparison points by adopting a bisection method, a Newton method and a chord section method;
s2, if f (L)i-1)·f(Li)>0, then the measuring section [ L ]i-1,Li]Is located on the same side of the normal plane, the normal plane and the measuring section [ L ]i-1,Li]There is no intersection point or one intersection point or two intersection points, wherein the normal plane and the measuring section [ L ]i-1,Li]There is one intersection or there are two intersectionsThe requirements are as follows: there is a certain point C in the segment under test, satisfying the following formula:
f′(LC)＝0
and, the normal plane and the measuring section [ L ]i-1,Li]A sufficient condition for the presence of one intersection or the presence of two intersections is that the following formula is satisfied:
if the necessary condition and the sufficient condition are simultaneously satisfied, the normal plane and the measuring section [ L ]i-1,Li]There is one intersection or two intersections, and 2 sub-well sections [ L ] are calculated using the method described in step S1i-1,LC]And [ LC,Li]Selecting a point closest to the reference point space as a candidate comparison point;
s3, when the measuring section [ L ]i-1,Li]When it is a straight line segment, if f (L)i-1)·f(Li) If the normal plane is less than or equal to 0, intersecting the measuring section, otherwise, not intersecting; when f (L) is not equal to 0, the section [ L ≡ 0-i-1,Li]And selecting a point closest to the reference point in space distance as a candidate comparison point in the normal plane.
6. The method of claim 5, wherein in the step of determining comparison points based on the alternative comparison points, further comprising:
and based on the alternative comparison points of each measurement section of the comparison well, taking the alternative comparison point closest to the reference point space distance as a comparison point, and calculating the normal surface distance and the scanning angle between the reference point and the comparison point for the adjacent well anti-collision evaluation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811188834.4A CN111042795B (en) | 2018-10-12 | 2018-10-12 | Calculating method for scanning normal surface distance of adjacent well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811188834.4A CN111042795B (en) | 2018-10-12 | 2018-10-12 | Calculating method for scanning normal surface distance of adjacent well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111042795A true CN111042795A (en) | 2020-04-21 |
| CN111042795B CN111042795B (en) | 2023-04-18 |
Family
ID=70229802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811188834.4A Active CN111042795B (en) | 2018-10-12 | 2018-10-12 | Calculating method for scanning normal surface distance of adjacent well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111042795B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852447A (en) * | 2020-07-27 | 2020-10-30 | 北京智博远成软件技术有限公司 | Rapid borehole anti-collision calculation algorithm based on buffer search radius |
| CN114810023A (en) * | 2022-01-17 | 2022-07-29 | 中国石油化工集团有限公司 | Construction method suitable for collision prevention of dense well |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644457A (en) * | 2012-04-19 | 2012-08-22 | 中国海洋石油总公司 | Method for calculating distance between adjacent wells whiling drilling |
| WO2014201237A1 (en) * | 2013-06-12 | 2014-12-18 | Schlumberger Canada Limited | Well trajectory planning using bounding box scan for anti-collision analysis |
| CN105089643A (en) * | 2014-05-12 | 2015-11-25 | 中国石油化工股份有限公司 | Analytic method for adjacent well distance scanning |
| CN105095540A (en) * | 2014-05-12 | 2015-11-25 | 中国石油化工股份有限公司 | Normal plane scanning analytical method for inter-well relative position relations |
| CN106988726A (en) * | 2016-01-21 | 2017-07-28 | 中国石油化工股份有限公司 | High-precision well track monitoring method |
-
2018
- 2018-10-12 CN CN201811188834.4A patent/CN111042795B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644457A (en) * | 2012-04-19 | 2012-08-22 | 中国海洋石油总公司 | Method for calculating distance between adjacent wells whiling drilling |
| WO2014201237A1 (en) * | 2013-06-12 | 2014-12-18 | Schlumberger Canada Limited | Well trajectory planning using bounding box scan for anti-collision analysis |
| CN105089643A (en) * | 2014-05-12 | 2015-11-25 | 中国石油化工股份有限公司 | Analytic method for adjacent well distance scanning |
| CN105095540A (en) * | 2014-05-12 | 2015-11-25 | 中国石油化工股份有限公司 | Normal plane scanning analytical method for inter-well relative position relations |
| CN106988726A (en) * | 2016-01-21 | 2017-07-28 | 中国石油化工股份有限公司 | High-precision well track monitoring method |
Non-Patent Citations (1)
| Title |
|---|
| 刘修善等: "法面扫描井间距离的解析算法", 《石油钻探技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852447A (en) * | 2020-07-27 | 2020-10-30 | 北京智博远成软件技术有限公司 | Rapid borehole anti-collision calculation algorithm based on buffer search radius |
| CN111852447B (en) * | 2020-07-27 | 2023-05-16 | 北京智博远成软件技术有限公司 | Rapid wellbore anti-collision calculation algorithm based on buffer search radius |
| CN114810023A (en) * | 2022-01-17 | 2022-07-29 | 中国石油化工集团有限公司 | Construction method suitable for collision prevention of dense well |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111042795B (en) | 2023-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9733387B2 (en) | Geological exploration method for making plan and elevation drawings directly by rotational tin network and non profiling method | |
| CN101680758B (en) | Position determination method for a geodetic measuring device | |
| US8862436B2 (en) | Systems and methods for modeling wellbore trajectories | |
| CN111042795B (en) | Calculating method for scanning normal surface distance of adjacent well | |
| SA94140536B1 (en) | Method for determining the direction of a drill hole | |
| US20170204715A1 (en) | Systems and Methods for Positioning Horizontal Wells Within Boundaries | |
| AU2013371633A1 (en) | System and method for predicting and visualizing drilling events | |
| CN106988726B (en) | High-precision borehole trajectory monitoring method | |
| CN107227950B (en) | Method for evaluating integrity of actual drilling hole track | |
| CN104653172A (en) | Determination method for initial well deviation azimuth angle of three-dimensional horizontal well borehole trajectory | |
| US20190085684A1 (en) | Method, device and terminal for determining borehole cross-sectional shape | |
| CN105095540A (en) | Normal plane scanning analytical method for inter-well relative position relations | |
| CN105089643B (en) | A kind of analytic method of offset well range sweep | |
| CN111046515B (en) | Alert distance evaluation method for adjacent well collision prevention | |
| CN106321062B (en) | Method for acquiring drilling rate of production well target area of SAGD double-horizontal well | |
| CN107780926B (en) | Borehole section shape measuring method, device and terminal | |
| CN108151693A (en) | The determining method and device of pipeline mitered feature | |
| CN114440831A (en) | Mine section inspection method based on total station point projection | |
| CN112525148B (en) | Method for determining deformation range of goaf | |
| CN111414705B (en) | Three-dimensional space traversable evaluation method for bump-proof design of borehole trajectory of cluster well | |
| CN103883252B (en) | A kind of horizontal well Landing Control method based on slide-and-guide drilling well | |
| CN110805430B (en) | Method for evaluating and characterizing borehole trajectory errors | |
| CN110807234B (en) | Method for evaluating borehole trajectory error on any section | |
| AU2015202765B2 (en) | Geological Exploration Method For Making Plan And Elevation Drawings Directly By Rotational Tin Network And Non-Profiling Method | |
| JP2016061080A (en) | Prediction method for natural ground situation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |