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Method of excavation of oil and gas-producting wells

Inactive Publication Date: 2010-12-16
YERUSALIMSKY DAVID +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]Accordingly, it is an object of the present invention to increase productivity of opening of oil- and gas-productive layers due to reliable determination of productive layers, isolation of water flows, reduction of expenses for opening of effective areas, and increase of permeability of a near-well zone of layers.

Problems solved by technology

However, very often, because of complicated structure and specifics of saturation of rock-collector, this objective can not be properly achieved (see V. A. Kosterina, T. V. Sokolova “Non-traditional Approach to Determination of Productive Terrigenic Collectors and Evaluation of Their Saturation”, Geophysics No. 2, 2005, EAGO).
Existing methods of opening (cumulative perforation) in this case creates cracks and causes a flow of water, that penetrates into a productive layer.
This leads to a reduction of flow and closing of the water-filled well.
However, this method requires high energy consumption (U.S. Pat. No. 3,966,992).

Method used

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Embodiment Construction

[0010]The method in accordance with the present invention includes cutting of two slots in one plane so as to form a partition of rock between them and so that stresses from surfaces of slots are redistributed onto the partition and create in it additional pressure; and selecting widths of the slots and the partition such that the partition becomes so stressed that it self-destructs, and as a result a single slot is formed with a length which is equal to lengths of both initial slots and the partition.

[0011]In accordance with the invention values have been determined of sizes of the slots and distances between them for self-destruction of the partitions. The partition is in extreme stressed condition with the size:

h=½·σ / σ3{1+}1+4|σ3 / σ1}1 / 2

The parameters in this formula take into consideration sizes of contour slot, strength characteristic of the layer (σ3) and a value of stresses taken from the slots (σ). The formula is obtained as follows.

[0012]Extreme load Pst on the partition is...

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Abstract

A method of opening oil- and gas productive layers has the steps of cutting of two slots in one plane so as to form a partition of rock between them and so that stresses from surfaces of slots are redistributed onto the partition and create in it additional pressure, and selecting widths of the slots and the partition such that the partition becomes so stressed that it self-destructs, and as a result a single slot is formed with a length which is equal to lengths of both initial slots and the partition.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to oil and gas industry, and in particular to methods of opening of oil- and gas productive layers. It relates to reliable determination and opening of oil- and gas-productive deposits, with reduction of loses for such works.[0002]Methods of determination of oil- and gas- productive layers are known, that include detailed investigation of geological-geophysical and exploration materials over an area and cuts through the wells. However, very often, because of complicated structure and specifics of saturation of rock-collector, this objective can not be properly achieved (see V. A. Kosterina, T. V. Sokolova “Non-traditional Approach to Determination of Productive Terrigenic Collectors and Evaluation of Their Saturation”, Geophysics No. 2, 2005, EAGO). For this case it is necessary to carry out special investigations for determination of gas-oil regions.[0003]On the other hand in some cuts through the wells water-containing...

Claims

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Application Information

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IPC IPC(8): E21B7/00
CPCE21B43/119
Inventor YERUSALIMSKY, DAVIDBASIN, YAKOVNEIMAN, VILEN S.
Owner YERUSALIMSKY DAVID
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