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A Drilling Geological Design Method for Horizontal Wells in Tight Sandstone Lithologic Gas Reservoirs

A technology for tight sandstone and horizontal wells, applied in drilling equipment and methods, drilling equipment, directional drilling, etc., to avoid cumbersome numerical simulation methods, easy to operate, and overcome low precision

Active Publication Date: 2017-02-01
PETROCHINA CO LTD
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Problems solved by technology

There is no mature geological design method for drilling horizontal wells in tight sandstone gas reservoirs in China

Method used

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  • A Drilling Geological Design Method for Horizontal Wells in Tight Sandstone Lithologic Gas Reservoirs

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Embodiment 1

[0032] Embodiment 1: as figure 1 as shown,

[0033] A geological design method for horizontal well drilling in tight sandstone lithologic gas reservoirs, which is a geological design method for horizontal well drilling that integrates fine description of geological reservoirs and seismic gas-bearing prediction technology, and is suitable for strongly heterogeneous tight sandstone lithologic gas reservoirs. Tibetan.

[0034] figure 1 The process described is that in the geological design of tight sandstone horizontal wells, firstly, the strata in the target area of ​​the horizontal well should be compared and divided according to the geology. Gas property prediction is the core, combined with geological and stratigraphic comparison results, the target layer is calibrated and the position of the horizontal well section is determined, and the distribution shape of the reservoir is predicted. Through the geological and seismic comprehensive description results of the target lay...

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Abstract

The invention discloses a drilling geological design method of a compact sandstone lithology gas reservoir horizontal well, and belongs to the technical field of development of natural gas. Geological reservoir data is gathered; and a deploy area earthquake profile map, a sand body thickness chart, an effective reservoir thickness chart, a structural map, a gas reservoir profile map and a trajectory schematic diagram of the horizontal well are established through a technical step of precisely describing the geological reservoir data and predicting the earthquake gas bearing property to realize quantitative representation of reservoir space distribution so as to optimize and determine a trajectory target point of the horizontal well to give out a horizontal section target point design list of the horizontal well so as to provide the basis for the implementation of the horizontal well. The method overcomes the defect of low precision in a traditional geological analytical method, prevents the defects of troublesome operation and high difficulty in an oil and gas reservoir numerical value simulation method, has the characteristic of convenience for operation, and guarantees the sandstone drilling ratio of the drilled horizontal well above 75% and the effective reservoir drilling ratio above 55%.

Description

technical field [0001] The invention relates to a drilling geological design method for horizontal wells in tight sandstone lithological gas reservoirs, belonging to the technical field of natural gas development. Background technique [0002] Tight sandstone gas is the main growth point of my country's current natural gas production. One of the main means of economical scale development of tight sandstone gas is to adopt horizontal well development technology. Horizontal well drilling geological design is the most basic and important work in horizontal well development. It mainly solves the trajectory of the horizontal section of the horizontal well in the oil and gas layer, including the target distance, azimuth, length, target depth and horizontal section of the horizontal well. The vertical position of each target point in the oil and gas layer. At present, there are mainly two methods for horizontal well design: one is the conventional geological analysis method, whic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B49/00
CPCE21B7/046E21B49/003
Inventor 李跃刚王龙张吉王继平孙卫峰张志刚刘平冯敏陈志华
Owner PETROCHINA CO LTD
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