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Method for determining hole trajectory of multi-target horizontal well

A technology for determining the well trajectory and method, which is applied in directional drilling and other directions, and can solve problems such as limited number of targets, large azimuth errors, and disconnection between engineering and geology

Active Publication Date: 2012-03-28
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for determining the borehole trajectory of a multi-target horizontal well, so as to solve the problems of large azimuth error, limited number of target points, and disconnection between engineering and geology in the current method for determining the borehole trajectory of horizontal wells

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  • Method for determining hole trajectory of multi-target horizontal well
  • Method for determining hole trajectory of multi-target horizontal well
  • Method for determining hole trajectory of multi-target horizontal well

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Embodiment Construction

[0046] The steps of the method for determining the borehole trajectory of a multi-target horizontal well are as follows:

[0047] (1) According to the seismic data, geological logging data and geophysical logging data, draw the plane structural map or contour map of the reservoir, determine the distribution of the sand body in the reservoir, and determine the displacement in front of the target in combination with the size of the borehole and the capacity of the drilling rig , determine the wellhead coordinates, target point coordinates and target point vertical depth according to the field exploration results, the target points include the first target point, the last target point and N control points between the first target point and the last target point target;

[0048] (2) Determine the wellbore trajectory from the wellhead to the first target point;

[0049] (3) Determine the inclination angle and borehole curvature of each control target point according to the paramet...

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Abstract

The invention relates to a method for determining a hole trajectory of a multi-target horizontal well. The method comprises the following steps of: drawing a reservoir planar structure diagram or a contour chart according to seismic data, geological log data and geophysical logging data, determining reservoir sand body distribution, determining pre-target displacement in combination with the hole size and the drill capacity, and determining a well coordinate, a target coordinate and a target vertical depth in combination with a field exploration result; determining the hole trajectory ranging from a hole to a first target; and determining the curvature of the hole at a horizontal section and the deviation angle of each control target according to the parameter of the first target, the coordinate and vertical depth of each control target and the deflecting capacity of a deflecting tool to determine the hole trajectory at the horizontal section. In the method, engineering is combined with geology, so that the hole trajectory of the multi-target horizontal well can be realized, the phenomenon of bearing shifting is avoided, and the method is particularly suitable for thin reservoirs with high anisotropism. The method is easy and convenient to implement, and can be implemented by both engineering design personnel and field technical personnel.

Description

technical field [0001] The invention belongs to the field of oil and gas drilling, and relates to a method for determining the trajectory of a two-dimensional multi-target horizontal well. Background technique [0002] Compared with vertical wells, horizontal wells have great advantages in expanding oil (gas) drainage area, increasing single well production, and effectively producing reserves. At present, many oil and gas fields use horizontal wells to exploit oil and gas. In recent years, with the development of geophysical prospecting and related technologies, With a deeper understanding of the spatial distribution characteristics of reservoir sand bodies, for the use of horizontal wells to develop thin reservoirs with strong heterogeneity, in order to enable the horizontal section to pass through the favorable parts of the reservoir, it is required to Add multiple control targets between point and B target. For example, the Daniudi gas field in the Ordos Basin belongs to...

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Application Information

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IPC IPC(8): E21B7/04
Inventor 闫吉曾郑锋辉狄伟邓红琳秦玉英
Owner CHINA PETROLEUM & CHEM CORP
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