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Horizontal well track tracking method for river channel sand body

A trajectory tracking, channel sand body technology, applied in earthwork drilling, wellbore/well components, measurement, etc., can solve problems such as inaccurate seismic prediction of depth in horizontal well sections, improve drilling success rate, and achieve accurate target layer tracking. , the effect of eliminating the depth error

Inactive Publication Date: 2019-05-10
PETROCHINA CO LTD +1
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Problems solved by technology

[0003] The present invention aims at overcoming the problem of inaccurate seismic prediction of the existing horizontal well section depth existing in the background technology, and provides a track tracking method for channel sand body horizontal wells

Method used

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  • Horizontal well track tracking method for river channel sand body
  • Horizontal well track tracking method for river channel sand body
  • Horizontal well track tracking method for river channel sand body

Examples

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Effect test

Embodiment 1

[0018] Below take Daqing Oilfield Songliao Basin Fuyu Reservoir Straight A Well as an example to illustrate the implementation process of the inventive method, comprising the following steps:

[0019] The first step is to determine the genetic type, cycle characteristics, and sandstone thickness of the river sandbody in the target layer in combination with the regional sedimentary characteristics and the sandbody characteristics of adjacent wells;

[0020] In the No. 55 layer of Well Zhi A in the Fuyu oil layer in the Songliao Basin, the sandstone thickness is 9.6m, the effective thickness is 1.6m, the porosity is 12.3%, and the permeability is 0.3mD. features such as figure 1 As shown in the comprehensive histogram of a single well in Well Zhi A, although the single-layer thickness of this well is large, the productivity of Well Zhi A is low due to the thin effective thickness. About 1500m, about 700m wide sandy strip, with an area of ​​about 1.1km 2 , so at a vertical dist...

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Abstract

The invention relates to a horizontal well track tracking method for a river channel sand body. The problem that a target layer is difficult to track in a horizontal section drilling process due to inaccurate deep earthquake prediction of an existing horizontal section is solved. The method comprises the following steps of: 1, determining a sand body cause type, a cycle characteristic and a sandstone thickness of a target layer by combining regional deposition characteristics and adjacent well sand body characteristics; 2, analyzing the deposition cycle change characteristics of a drilled target layer through a natural gamma logging curve in the process of drilling; and 3, judging the cutting relation between a drill bit and the stratum and the cycle change characteristic of the natural gamma curve by combining well wall imaging data, and accurately judging the cutting relation between the direction of the drill bit and the sand body; and 4, comprehensively judging the drill bit adjusting direction. The horizontal well track tracking method for the river channel sand body is favorable for guiding accurate tracking and adjustment of a thin sand layer horizontal well, and the sandstone drilling rate of a horizontal well section is increased.

Description

technical field [0001] The invention relates to the technical field of oil field drilling engineering, in particular to a track tracking method for a channel sand body horizontal well. Background technique [0002] The spatial configuration of channel sand bodies is the key to accurate tracking of horizontal wells in the target layer. At present, the calculation of horizontal well trajectory depth in drilling geological design is mainly based on well data and seismic prediction. Since the channel sand bodies in the main reservoirs of tight oil have the characteristics of thin single layer thickness and fast lateral change of sand bodies, tight oil extraction It is very difficult to adjust the trajectory of horizontal wells in the drilling process of the horizontal section. For example, the Fuyu oil layer in the northern Songliao Basin belongs to shallow water delta deposits, with thin single layer thickness (3-6m) and fast lateral change of sand bodies (the width of the chan...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B47/024E21B49/00
Inventor 蒙启安黄薇林铁锋张革李国会戴国威杨庆杰林景晔
Owner PETROCHINA CO LTD
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