CN106640040A - Screening method of risk wells needing top retests - Google Patents
Screening method of risk wells needing top retests Download PDFInfo
- Publication number
- CN106640040A CN106640040A CN201611105352.9A CN201611105352A CN106640040A CN 106640040 A CN106640040 A CN 106640040A CN 201611105352 A CN201611105352 A CN 201611105352A CN 106640040 A CN106640040 A CN 106640040A
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- China
- Prior art keywords
- well
- risk
- repetition measurement
- gyro
- data
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Classifications
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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
- E21B47/00—Survey of boreholes or wells
Abstract
The invention discloses a screening method of risk wells needing top retests. According to the method, a computer anti-collision scanning result and goodness of fit of retest data and original data are utilized to screen the risk wells needing top retests in drilled wells. The method comprises the steps that all the drilled wells of a platform are subjected to anti-collision scanning, and according to parameters of a separation coefficient, a center distance and the like, the drilled wells are divided into a first grade risk wells and a second grade risk wells; the first grade risk wells are subjected to top retests, and a comparison with the original data is conducted; if the retest data is slightly different from the original data, the second grade risk wells do not need to be retested, and if the retest data is drastically different from the original data, the second grade risk wells are subjected to retests. According to the screening method of the risk wells needing the top retests, on the premise of guaranteeing well drilling job safety, workload of the drilled well top retests is effectively reduced, and the cost is reduced.
Description
Technical field
The invention belongs to field of oil drilling, is related to a kind of cluster well well-drilling borehole Track Control Technology, it is especially a kind of
Method for solving the risk well for needing gyro repetition measurement before encrypted adjustment well is bored in screening drilling well.
Background technology
Cluster well platform slot spacing is little, especially offshore platform, is limited by platform area, and notch spacing is less, well
Eye is densely distributed.Hole trajectory control difficulty is big in drilling process, and well risk of collision is high, and anti-collision difficulty is big.Especially bore and add
Close adjustment well, equivalent to " besom is interleave in besom ", well anti-collision difficulty is very big.
Accurate hole trajectory data is the premise of the efficient control of well track and anti-collision, the especially well track of drilling well
Data, are the important evidences for adjusting well design, anti-collision scan and wellbore construction.Once hole trajectory data is inaccurate, occur
Well is collided, it is possible to cause well to be scrapped, the serious accident such as oil spilling, causes huge economic losses and potential safety hazard.
For some old platforms (especially 2000 before platform), due to by technical merit at that time, survey tool essence
The impact of degree and coordinate system, the accuracy of its wellbore trace data cannot confirm.These old platforms bore adjustment wells it
Before, in order to ensure the accuracy of wellbore trace data, typically the track of drilling well is carried out again using gyrolevel
Measurement, i.e. gyro repetition measurement.
Although gyro repetition measurement can ensure that the accuracy of wellbore trace data, but the old platform more for well number,
If every mouthful of well all repetition measurements, not only increase duty cycle and operating cost, simultaneously because during repetition measurement must closing well, can also cause to produce
Amount loss.Many additionally, due to drilling well production facility, working place is little, and repetition measurement operation also has larger security risk.
Therefore, how under the premise of ensureing that wellbore trace data are accurate, reducing gyro repetition measurement well number and workload is
Problem demanding prompt solution.
The content of the invention
In order to solve problems of the prior art, the present invention is provided before a kind of adjustment well is bored to needing top in drilling well
The screening technique of the risk well of spiral shell repetition measurement, the workload of gyro repetition measurement drilling well is big and operating cost is high in solution prior art,
The big problem of operating risk.
The present invention is achieved through the following technical solutions：
A kind of adjustment well bores the front screening technique to needing the risk well of gyro repetition measurement in drilling well, and the method is using meter
The degree of agreement of calculation machine anti-collision scan result, repetition measurement data and initial data to screen drilling well in need the risk of gyro repetition measurement
Well, the method comprising the steps of：1) drilling wells all to platform carry out computer anti-collision scan, according to separation, centre-to-centre spacing etc.
Parameter, by drilling well prime risk well and the light breeze danger class of well two are divided into；2) carry out gyro repetition measurement to prime risk well, and with original
Beginning data are contrasted；3) if repetition measurement data and initial data gap less if light breeze danger well without repetition measurement, if with original
The big then light breeze danger well of beginning gap data carries out repetition measurement.
The drilling well is the drilling well of design adjustment well well location place platform.
The gyro repetition measurement is referred to wellbore trace is measured using gyrolevel.
The computer anti-collision scan to be referred to and design business software to design adjustment well and between drilling well using directional well
Minimum range is scanned calculating, determines well collision and convergence risk.
The repetition measurement data refer to the track data for measuring gained to wellbore trace using gyrolevel；It is original
Data refer to the original track data of drilling well.
The centre-to-centre spacing refers to design adjustment well well center to the distance at well-drilling borehole center；Separation is referred to and set
Meter adjustment well and the centre-to-centre spacing between drilling well is divided by the radius sum of two well error ellipses, computing formula is as follows：
SF=L/ (R1+R2)
Wherein：
SF-separation, dimensionless；
L-design adjustment well and the centre-to-centre spacing between drilling well, m；
R1The error ellipse radius of-design adjustment well well, m；
R2The error ellipse radius of-well-drilling borehole, m.
Described error ellipse is referred to because measurement error causes at measuring point spatially region that may be present, i.e. well
Track is likely located at optional position in ellipse, and its radius can be calculated using directional well design business software and tried to achieve.
The prime risk well is referred to and meets any one in following condition：
(1) separation<1.5；
(2) centre-to-centre spacing<10m；
(3) the non-gyrolevel measurement gained of initial trace data；
Light breeze danger well is referred to and meets any one in following condition：
(1)1.5<Separation<2；
(2)10m<Centre-to-centre spacing<20m.
Prime risk well gyro repetition measurement data are contrasted with initial data, are met any one in following condition and are represented and original
Data differ greatly：
(1) centre-to-centre spacing between former data and gyro repetition measurement data>5m；
(2) former data and design adjusts centre-to-centre spacing between well, gyro repetition measurement data and designs centre-to-centre spacing between adjustment well, and two
Person differs>3m；
As two above condition is unsatisfactory for, then it represents that be more or less the same with former data.
The invention has the beneficial effects as follows：A kind of adjustment well of the present invention bores the front risk to needing gyro repetition measurement in drilling well
The screening technique of well, i.e., for (especially cluster well platform) on the platform of design adjustment well well location place well-drilling borehole track number
According to accuracy cannot confirm, this method utilize computer anti-collision scan result, filter out from drilling well prime risk well and
Light breeze danger well, according to prime risk well gyro repetition measurement result, determines whether light breeze danger well needs repetition measurement.The present invention can basis
The actual conditions of different platform well-drilling borehole track data, filtering out needs the risk well of gyro repetition measurement.Can avoid because
The well collision accident that wellbore trace data are inaccurate and cause, it is ensured that drillng operation safety, effectively reduces the work of gyro repetition measurement
Measure, and reduces cost.
Description of the drawings
Fig. 1 is that the adjustment well of the present invention bores the front flow process to needing the screening technique of the risk well of gyro repetition measurement in drilling well
Schematic diagram.
Specific embodiment
Below in conjunction with accompanying drawing, the present invention will be described in detail with example is embodied as, but is not limited to the present invention's
Scope.If not specializing, the conventional meanses that technological means used are well known to those skilled in the art in embodiment.
Embodiment 1：Total 10 mouthfuls of the drilling well of certain oil field A platforms, 10 mouthfuls of wells are institute's drilling well in the past in 2000, track number
According to as shown in table 1.Plan to implement 4 mouthfuls of adjustment wells in the platform, planned course is as shown in table 2.
The A platforms of table 1 wellbore trace data
The A platforms of table 2 adjust well planned course
As shown in figure 1, it is the main flow schematic diagram that the present invention is implemented.
Step 1, carries out anti-collision scan, as a result as shown in table 3 to drilling well and design adjustment well.
The A platform anti-collision scan results of table 3
| Well-name | Anti-collision well | Anti-collision well section (m) | Separation | Centre-to-centre spacing (m) | Whether it is gyro to measure data | Risk class |
| A1 | A15 | 0-560 | 1.025 | 1.73 | Nothing | One-level |
| A2 | A16 | 0-580 | 2.16 | 4.72 | Nothing | One-level |
| A3 | A17 | 0-650 | 3.7 | 14.3 | Have | Two grades |
| A4 | A18 | 0-720 | 5.4 | 12.1 | Have | Two grades |
| A5 | A19 | 0-250 | 15.2 | 9.41 | Have | One-level |
| A6 | A20 | 0-820 | 1.6 | 9.22 | Have | One-level |
| A7 | A21 | 0-640 | 3.2 | 10.5 | Have | Two grades |
| A8 | A22 | 0-570 | 4.5 | 11 | Have | Two grades |
| A9 | A23 | 0-700 | 3.2 | 13 | Have | Two grades |
| A10 | A24 | 0-560 | 1.22 | 2.29 | Have | One-level |
Step 2, according to anti-collision scan result, classifies to drilling risk rank, as shown in table 3, A1, A2, A5,
Five mouthfuls of wells of A6, A10 are prime risk well.
Step 3, carries out gyro repetition measurement, as a result as shown in table 4 to prime risk well.
The prime risk well gyro repetition measurement result of table 4
Step 4, gyro repetition measurement data are contrasted with initial data, from table 4, it can be seen that each measuring point original data and repetition measurement data
Centre-to-centre spacing is respectively less than 5m, and the difference of design adjustment well centre-to-centre spacing is respectively less than 3m.
Step 5, according to comparing result as can be seen that initial data is more or less the same with repetition measurement data.
Step 6, to light breeze danger well, i.e. A3, A4, A7, A8, A9 well cancels gyro repetition measurement.
Embodiment 2：Total 7 mouthfuls of the drilling well of certain oil field B platforms, 7 mouthfuls of wells are institute's drilling well in the past in 2000, track data
As shown in table 5.Plan to implement 3 mouthfuls of adjustment wells in the platform, planned course is as shown in table 6.
The B platforms of table 5 wellbore trace data
The B platforms of table 6 adjust well planned course
As shown in figure 1, it is the main flow schematic diagram that the present invention is implemented.
Step 1, carries out anti-collision scan, as a result as shown in table 7 to drilling well and design adjustment well.
The B platform anti-collision scan results of table 7
| Well-name | Anti-collision well | Anti-collision well section (m) | Separation | Centre-to-centre spacing (m) | Whether it is gyro to measure data | Risk class |
| B1 | B11 | 0-600 | 0.79 | 0.36 | Have | One-level |
| B2 | B12 | 0-560 | 0.84 | 2.28 | Have | One-level |
| B3 | B13 | 0-630 | 0.62 | 0.84 | Have | One-level |
| B4 | B14 | 0-600 | 2.9 | 11.4 | Have | Two grades |
| B5 | B15 | 0-400 | 6.2 | 1.82 | Have | One-level |
| B6 | B16 | 0-430 | 5.3 | 11 | Have | Two grades |
| B7 | B17 | 0-520 | 4.3 | 12.5 | Have | Two grades |
Step 2, according to anti-collision scan result, classifies to drilling risk rank, as shown in table 7, B1, B2, B3, B5
Four mouthfuls of wells are prime risk well.
Step 3, carries out gyro repetition measurement, as a result as shown in table 8 to prime risk well.
The prime risk well gyro repetition measurement result of table 8
Step 4, gyro repetition measurement data are contrasted with initial data, and as can be seen from Table 8, B1 wells are in 600m original data and repetition measurement
Data center is away from for 6.75m；B2 wells in 560m original data and repetition measurement data centers away from for 5.2m, with design adjust well centre-to-centre spacing it
Difference is 3.63m；In 630m original data and repetition measurement data centers away from for 5.95m, and design adjusts the difference of well centre-to-centre spacing and is B3 wells
3.76m；In 400m original data and repetition measurement data centers away from for 5.35m, and the difference of design adjustment well centre-to-centre spacing is 3.38m to B5 wells.
Step 5, according to comparing result as can be seen that initial data differs greatly with repetition measurement data.
Step 6, to light breeze danger well, i.e. B4, B6, B7 well gyro repetition measurement is carried out.Repetition measurement result is as shown in table 9.
The light breeze of table 9 danger well gyro repetition measurement result
Claims (10)
1. a kind of screening technique of the risk well for needing gyro repetition measurement, it is characterised in that：The method is swept using computer anti-collision
The risk well of gyro repetition measurement is needed during the degree of agreement of result, repetition measurement data and initial data is retouched to screen drilling well.
2. the screening technique of the risk well for needing gyro repetition measurement according to claim 1, it is characterised in that：Including following step
Suddenly：
(1) drilling wells all to platform carry out computer anti-collision scan, according to parameters such as separation, centre-to-centre spacing, from drilling well
In filter out prime risk well and light breeze danger well two class；
(2) gyro repetition measurement is carried out to prime risk well, and is contrasted with initial data；
(3) if repetition measurement data and initial data gap less if light breeze danger well without repetition measurement, if with initial data gap
Big then light breeze danger well carries out repetition measurement.
3. the screening technique of the risk well for needing gyro repetition measurement according to claim 1, it is characterised in that：The drilling well
For the drilling well of design adjustment well well location place platform.
4. the screening technique of the risk well for needing gyro repetition measurement according to claim 1, it is characterised in that：The gyro is answered
Survey is referred to wellbore trace is measured using gyrolevel.
5. the screening technique of the risk well for needing gyro repetition measurement according to claim 1, it is characterised in that：The computer
Anti-collision scan is referred to using directional well design business software is to design adjustment well and the minimum range between drilling well has been scanned meter
Calculate, determine well collision and convergence risk.
6. the screening technique of the risk well for needing gyro repetition measurement according to claim 1, it is characterised in that：The repetition measurement number
According to refer to using gyrolevel wellbore trace is measured gained track data；Initial data refers to that drilling well is original
Track data.
7. the screening technique of the risk well for needing gyro repetition measurement according to claim 2, it is characterised in that：The centre-to-centre spacing
Refer to design adjustment well well center to the distance at well-drilling borehole center；Separation refer to design adjustment well and drilling well it
Between centre-to-centre spacing divided by two well error ellipses radius sum, computing formula is as follows：
SF=L/ (R1+R2)
Wherein：
SF-separation, dimensionless；
L-design adjustment well and the centre-to-centre spacing between drilling well, m；
R1The error ellipse radius of-design adjustment well well, m；
R2The error ellipse radius of-well-drilling borehole, m.
8. the screening technique of the risk well for needing gyro repetition measurement according to claim 7, it is characterised in that：Described error
Ellipse is referred to because measurement error causes at measuring point that spatially region that may be present, i.e. well track are likely located in ellipse
Optional position, its radius can be calculated using directional well design business software and tried to achieve.
9. the screening technique of the risk well for needing gyro repetition measurement according to claim 2, it is characterised in that：The force one wind
Dangerous well is referred to and meets any one in following condition：
(1) separation<1.5；
(2) centre-to-centre spacing<10m；
(3) the non-gyrolevel measurement gained of initial trace data；
Light breeze danger well is referred to and meets any one in following condition：
(1)1.5<Separation<2；
(2)10m<Centre-to-centre spacing<20m.
10. the screening technique of the risk well for needing gyro repetition measurement according to claim 2, it is characterised in that：Prime risk
Well gyro repetition measurement data and initial data are contrasted, and are met any one in following condition and are represented and differ greatly with former data：
(1) centre-to-centre spacing between former data and gyro repetition measurement data>5m；
(2) centre-to-centre spacing, gyro repetition measurement data and design adjust centre-to-centre spacing between well, Liang Zhexiang between former data and design adjustment well
Difference>3m；
As two above condition is unsatisfactory for, then it represents that be more or less the same with former data.
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| CN201611105352.9A CN106640040A (en) | 2016-12-05 | 2016-12-05 | Screening method of risk wells needing top retests |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593852A (en) * | 2019-09-10 | 2019-12-20 | 西南石油大学 | Cluster well borehole anti-collision short section, anti-collision system and anti-collision method |
| CN110761771A (en) * | 2019-09-23 | 2020-02-07 | 中国海洋石油集团有限公司 | Three-wire control method for early warning and prediction of key parameters of oil and gas well drilling, well completion and workover operations |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110761771A (en) * | 2019-09-23 | 2020-02-07 | 中国海洋石油集团有限公司 | Three-wire control method for early warning and prediction of key parameters of oil and gas well drilling, well completion and workover operations |
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