Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir

A technology for heavy oil reservoirs and combined production, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., and can solve the problems of unproducible oil layers in the upper part of the interlayer.

Active Publication Date: 2013-06-26
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

[0006] The present invention is completed to solve the difficult problem that the upper oil layer of the interlayer cannot be produced when the vertical and flat well combination gravity-assisted steam flooding method is used for the production of thick oil reservoirs with interlayers and ordinary heavy oil reservoirs.

Method used

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  • Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir
  • Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir
  • Gravity and steam flooding combined mining method of thick layer containing interlayer common heavy oil reservoir

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example 1

[0039] Example 1: The VI sand body of oil layer in an oilfield is a thick-bedded ordinary heavy oil reservoir, the viscosity of degassed crude oil at 50°C is 2284.2mPa.s, the average thickness of the oil layer is 38.89m, and interlayers are generally developed in the oil layer, with an average thickness of 2.4m , the main component is argillaceous siltstone. The average steam huff and puff of vertical wells in this reservoir has reached 7 cycles, the formation pressure has dropped from the original value of 16.1MPa to 1.0MPa, and the cycle oil production and oil-gas ratio have decreased. In view of the geological characteristics, crude oil properties and development status of the reservoir, the development is carried out by the combination of vertical wells and horizontal wells according to the following steps:

[0040] (1) Perform rough screening according to reservoir geological parameters and fluid characteristics;

[0041] (2) Since the thickness of the continuous oil lay...

example 2

[0047] Example 2: The sand body of an oil layer in an oilfield is a thick-bedded ordinary heavy oil reservoir, the depth of the reservoir is 750-800m, the viscosity of degassed crude oil at 50°C is 1680mPa.s, the average thickness of the oil layer is 31m, and interlayers are generally developed in the oil layer , with an average thickness of 1.7m, mainly argillaceous siltstone. The average steam huff and puff of vertical wells in this reservoir has reached 7 cycles, the formation pressure has dropped from the original value of 7.35MPa to 1.5MPa, and the cycle oil production and oil-gas ratio have decreased. According to the geological characteristics, crude oil properties and development status of the reservoir, the development is carried out by the combination of vertical wells and horizontal wells according to the following steps.

[0048] (1) Perform rough screening according to reservoir geological parameters and fluid characteristics;

[0049] (2) Since the thickness of ...

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Abstract

The invention provides a gravity and steam flooding combined mining method of a thick layer containing an interlayer common heavy oil reservoir. The method comprises the following steps: 1) whether geological parameters and fluid characteristics in an oil deposit block can satisfy mining conditions or not is ensured; 2) in an interlayer oil deposit block, a straight well and horizontal well combined well spacing mode is adopted, a horizontal producing well is drilled on the lower portion close to an oil layer, a steam injection straight well is arranged diagonally above the horizontal producing well, and a producing straight well is arranged in an area on the same layer with the steam injection straight well according to growing circumstances of the interlayer; 3) huff and puff are conducted simultaneously by the horizontal producing well and the steam injection straight well so that hot communication is formed by the steam injection straight well and the horizontal producing well, the reservoir pressure drops to 3-4MPa, and then steam is injected by the steam injection straight well, and production and mining are conducted by the horizontal producing well; and 4) after the oil layer on the lower portion of the interlayer is put into use basically, perforation is conducted on the parts, arranged on the upper portion of the interlayer, of the steam injection straight well and the producing straight well, steam injection well points are increased and steam quantity is improved at intervals, and production and mining are conducted simultaneously by the horizontal producing well and the producing straight well.

Description

technical field [0001] The invention relates to the oil exploitation technology, in particular to a combined exploitation method of gravity and steam flooding for common heavy oil reservoirs with thick interlayers. Background technique [0002] Steam huffing and puffing is the main production method for heavy oil production. With the advancement of production technology, the scope and methods of production are constantly being updated. Currently, SAGD-Steam Assisted Gravity Drainage (SAGD-Steam Assisted Gravity Drainage) is used for the production of super heavy oil reservoirs. This method is mainly aimed at the geological conditions of tar sands, and the characteristics of crude oil in tar sands It is high viscosity (viscosity greater than 50,000mPa.s), high density (density greater than 0.98g / cm 3 ), which is close to the density of water, and it is difficult or impossible to flow at the original formation temperature. The purpose of injecting steam is mainly to heat the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/24E21B43/30E21B43/26
Inventor 杨立强杨建平王宏远梁建宇由世江
Owner PETROCHINA CO LTD
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