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Method for designing well-drilling borehole track

A technology of wellbore trajectory and design method, which is applied in directional drilling, wellbore/well components, earthwork drilling and production, etc.

Inactive Publication Date: 2007-03-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Aiming at the deficiencies of the existing technology, a general wellbore trajectory optimization design method is proposed to solve the problem of wellbore trajectory design for various two-dimensional directional wells and horizontal wells, and can design any two parameters as variables to meet the drilling requirements. The need for scientific and standardized engineering design

Method used

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  • Method for designing well-drilling borehole track
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  • Method for designing well-drilling borehole track

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] Example 1: S-shaped directional well design

[0155] A directional well is designed with a vertical depth of 1500m and a horizontal displacement of 600m, and adopts an S-shaped well profile (a total of 5 well sections), as shown in Figure 4. The length of the first stabilizing section is 500m, and the inclination angle is 15°. is 150m, and the inclination angle is 8°.

[0156] Taking the well inclination angle α of the third well section (that is, the second stabilizing section) 3 , the curvature κ of the 4th well section (that is, the descending section) 4 , a total of two characteristic parameters are unknown variables.

[0157] Then get according to the design method of the present invention: the well inclination angle α of the 2nd stabilizing section 3 =38.495°, the curvature κ of the descending slope 4 =-6.132° / 100m. The design results are shown in Table 2.

[0158] Table 2 Design results of S-type directional wells

[0159]

Embodiment 2

[0160] Example 2: Three-increase horizontal well design

[0161] A horizontal well is designed with a vertical depth of 2000m, a displacement in front of the target of 630m, a horizontal section length of 500m, and a well inclination angle of 90°. A triple-increased well profile (7 sections in total) is used, as shown in Figure 5. The initial inclination angle is 0°, and the build-up point is 1450m; the inclination rate of the three inclination sections is 8° / 30m, 2° / 30m, and 10° / 30m, respectively, so that the inclination angle reaches 40° and 65° respectively , 90°.

[0162] Take the length ΔL of the third well section (that is, the second stabilizing section) 3 , the length ΔL of the 5th well section (namely the 3rd stabilizing section) 5 , a total of two characteristic parameters are unknown variables.

[0163] Then get according to the design method of the present invention: the length of 2 stabilizing sections is respectively 151.145m and 126.649m. The design results ...

Embodiment 3

[0166] Example 3: Ladder-shaped horizontal well section design

[0167]One horizontal well is used to develop two thin oil layers at different depths, and a stepped horizontal well section (total of 4 well sections) is used, as shown in Fig. 6. The geological design gives: the inclination angles of the two well sections in the oil layers are 88° and 90° respectively, the vertical depth difference of the target area is 10m, and the horizontal displacement is 420m. If the lower ladder track design scheme is adopted, build-up rates of -3° / 30m and 4.5° / 30m are selected for the two arc sections respectively, and the length of the second oil layer well section is required to be 150m.

[0168] Take the length ΔL of the first well section (that is, the first oil layer well section) 1 , the termination well inclination angle α of the second well section (that is, the descending section) 2 (that is, the α of point M in Figure 6 M ), a total of two characteristic parameters are unknow...

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Abstract

The invention relates to a two dimensional directional well formed by line and arc well section and well bore rail design of horizontal well. It includes the following steps: listing basic equation, expanding equation, giving known parameters, and solving equation. The invention resolves the rail designing problem into unified formalism. Randomly selecting two feature parameters as indeterminate parameter, it includes the taper point location and tool rate of build function. It could be used in the engineering design for drilling.

Description

technical field [0001] The invention relates to the drilling engineering design in the petroleum drilling engineering, in particular to the wellbore trajectory design of two-dimensional directional wells and horizontal wells composed of straight and arc well sections. Background technique [0002] Wellbore trajectory design is the primary task in realizing directional drilling. The design result of the well trajectory will not only affect the development effect of the oil well, but also directly relate to whether the drilling operation can be completed safely, with high quality and quickly. The optimized design of borehole trajectory can not only reduce the difficulty and workload of wellbore trajectory control, but also reduce the friction and torque of the drill string, and reduce the possibility of key grooves. Thus, it is beneficial to borehole cleaning, improving drilling speed and wellbore quality, and reducing drilling cost. [0003] The main well types that require...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B47/02
Inventor 刘修善马开华陈天成王文立候绪田
Owner CHINA PETROLEUM & CHEM CORP
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