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Adjustment method of diamond-shaped reverse nine-spot well pattern in multi-layer low-permeability sandstone reservoir during high water-cut period

A technology for sandstone oil reservoirs and high water-cut periods, which is used in earth-moving drilling, wellbore/well components, and production fluids. Achieve the effect of increasing oil production rate and improving oil well production

Active Publication Date: 2019-06-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problems in the development of multi-layer low-permeability sandstone reservoirs during the high water-cut period, such as serious single-layer water injection breakthrough phenomenon, large differences in water flooding effects of each layer, unbalanced reserves production degree, and increased water consumption

Method used

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  • Adjustment method of diamond-shaped reverse nine-spot well pattern in multi-layer low-permeability sandstone reservoir during high water-cut period
  • Adjustment method of diamond-shaped reverse nine-spot well pattern in multi-layer low-permeability sandstone reservoir during high water-cut period
  • Adjustment method of diamond-shaped reverse nine-spot well pattern in multi-layer low-permeability sandstone reservoir during high water-cut period

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Effect test

Embodiment 1

[0035] This embodiment provides a specific implementation process of an adjustment method for a diamond-shaped reverse nine-point well pattern in a multi-layer low-permeability sandstone reservoir during a high water-cut period. Such as figure 2 It is a flow chart of the method for adjusting the rhombus reverse nine-point well pattern in this embodiment.

[0036] In step 201, determine the dominant direction on the reservoir plane; the specific process is:

[0037] Based on sand body thickness distribution data, reservoir permeability anisotropy data, natural fracture data from core observation, artificial fracture azimuth monitoring and dynamic analysis, etc., the dominant direction on the reservoir plane is judged.

[0038] The direction in which the thickness of the sand body is basically the same is the dominant direction on the reservoir plane; on the contrary, the direction perpendicular to this direction is the non-dominant direction on the reservoir plane.

[0039] ...

Embodiment 2

[0059] This embodiment provides a specific implementation process of an adjustment method for a diamond-shaped reverse nine-point well pattern in a multi-layer low-permeability sandstone reservoir during a high water-cut period. figure 2 The flow chart of is also applicable to this embodiment.

[0060] In step 201, by using the permeability anisotropy data and the dynamic analysis method, it is determined that the angle between the dominant direction of the reservoir and the long diagonal of the rhombus is greater than 0.5 arctan (2b / a) and less than 1.5 arctan (2b / a), That is to say, the dominant direction of the reservoir is basically the same as that of the line connecting Well No. 6 and Well No. 2. The process goes to step 202.

[0061] In step 202, the water cut of No. 1 oil well is 58%, the water cut of No. 2 oil well is 70%, the water cut of No. 3 oil well is 58%, the water cut of No. 4 oil well is 58%, and the water cut of No. 5 oil well It is 58%, the water cut of ...

Embodiment 3

[0066] This embodiment provides a specific implementation process of an adjustment method for a diamond-shaped reverse nine-point well pattern in a multi-layer low-permeability sandstone reservoir during a high water-cut period. figure 2 The flow chart of is also applicable to this embodiment.

[0067] In step 201, through the permeability anisotropy data and dynamic analysis method, it is determined that the angle between the dominant direction of the reservoir and the long diagonal of the rhombus is greater than [180°-1.5arctan(2b / a)] and less than [180°- 0.5arctan(2b / a)], that is, the dominant direction of the reservoir is basically the same as that of the line connecting Well No. 8 and Well No. 4. The process goes to step 202.

[0068] In step 202, the water cut of No. 1 oil well is 58%, the water cut of No. 2 oil well is 58%, the water cut of No. 3 oil well is 58%, the water cut of No. 4 oil well is 70%, and the water cut of No. 5 oil well It is 58%, the water cut of N...

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Abstract

The invention provides an adjustment method of a high-water-cut-stage rhombic inverted nini-spot well pattern of a multi-layer low-permeability sandstone oil reservoir. The method comprises the following steps that firstly, the superior direction on a reservoir plane is judged; secondly, a high-water-cut oil well is judged in the plane, and a high-water-cut layer in multiple oil layers in the longitudinal direction; thirdly, according to the water driving oil effect of the oil layers, the development layer series are divided; fourthly, for the high-water-cut oil wells, the high-water-cut oil layers are plugged, and separated layer water injection is conducted for water injection walls; fifthly, in the mode that the high-water-cut oil wells are turned into the water injection wells in the fourth step, the structure of the rhombic inverted nini-spot well pattern is adjusted. By means of the adjustment method, the inefficient water circulation of the layers high in permeability and thickness can be reduced, the water driving oil effect and the reserves producing degree of the layers low in permeability and thickness can be improved, the oil well outputs are further improved, the oil recovery rate is increased, and the final water drive recovery efficiency and the economic benefits of oil reservoir exploitation are improved.

Description

technical field [0001] The invention belongs to the field of oil exploitation of multi-layer sandstone oil reservoirs, and in particular relates to an adjustment method for diamond-shaped reverse nine-point well pattern in the high water-cut period of multi-layer low-permeability sandstone oil reservoirs. Background technique [0002] Low permeability reservoirs refer to reservoirs with surface air permeability less than 50mD. Most of the low-permeability oilfields that have been put into development in China are fluvial-delta sedimentary types, and the reservoirs have certain heterogeneity and permeability anisotropy on the plane. Vertically, there are more oil-bearing layers, longer well intervals, and stronger interlayer heterogeneity. The development of this type of reservoir generally adopts diamond-shaped reverse nine-spot well pattern (see figure 1 ). After long-term water injection, the comprehensive water cut of the reservoir begins to rise. When the comprehensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/30E21B43/20
CPCE21B43/20E21B43/30
Inventor 甘俊奇王俊文张原周杨曾倩李锦王璐
Owner PETROCHINA CO LTD
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