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Well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation

An infilling method and well pattern technology, which is applied in wellbore/well components, production fluids, earthwork drilling, etc., can solve the difficulties of well pattern adjustment and well pattern infill, oilfield production degree, oil production speed and economic constraints, etc. question

Inactive Publication Date: 2012-08-08
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the huge investment in platform construction and drilling, offshore oil and gas fields can only be developed with a limited number of wells, well pattern adjustment and well pattern intensification are very difficult, and the degree of oil recovery, oil recovery speed and economic efficiency of oil fields are limited

Method used

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  • Well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation
  • Well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation
  • Well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Horizontal well A1 and horizontal well C3 are used as production wells, and horizontal well B2 uses the same well injection and production to turn one fracture Ba 21 into water injection, and fracture Bb22 and fracture Bc23 produce oil. At this time, water injection fracture Ba 21 is connected with horizontal well A1 and horizontal well Fractures Aa11, Ab12, Ca31, and Cb32 of B2 are reverse five-point well patterns. Such as figure 2 shown.

Embodiment 2

[0023] Horizontal well A1 and horizontal well C3 are used as oil production wells, and the three fractures Ba21, fracture Bb22 and fracture Bc23 of horizontal well B2 are all transferred to water injection. At this time, horizontal well A1, horizontal well B2 and horizontal well C3 are equivalent to a linear well pattern . Such as image 3 shown.

Embodiment 3

[0025] The horizontal well A1 was transferred to water injection in one fracture Ad14 by using the same well injection and production, and oil production in other fractures Ab12, Ac13, and Ad14 was maintained; at the same time, the horizontal well C3 was transferred to water injection in one fracture Cd34 by the same well injection and production, and other fractures were maintained. Cb32, fracture Cc33, and fracture Cd34 are used for oil production; the horizontal well B2 uses the same well injection and production to transfer water to one fracture Ba21, and keep the other fractures Bb22 and Bc23 for oil production. At this time, the injection-production system of the reverse 5-point well pattern is intensified. Such as Figure 4 shown.

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Abstract

The invention relates to a well pattern adjustment and well pattern encryption method applied to on-sea hypotonic oil deposit exploitation. A horizontal well A, a horizontal well B and a horizontal well C which are in mutually parallel are selected, staged fracturing is carried out on the three horizontal wells respectively to generate artificial fissures vertical to a well cylinder, three artificial fissures of the horizontal well B in the middle and four artificial fissures of the horizontal well A and four artificial fissures of the horizontal well C on the two sides are distributed at stagger, fissures are mutually parallel to each other, and the distance is 80-200m. Water injection is carried out on certain fissures through injection and exploitation in a same well, oil extraction is carried out in other fissures, and encryption effects of inverted five spot well patterns, threadiness well patterns and injection and exploitation systems of the inverted five spot well patterns and the threadiness well patterns can be formed.

Description

technical field [0001] The invention relates to a water injection and oil production method which utilizes horizontal wells and artificial fractures to establish an injection production system, and realizes well pattern adjustment and well pattern intensification through injection and production in the same well. Background technique [0002] Offshore oil and gas fields are in a marine environment, and production facilities and production wells need to be concentrated on offshore production platforms or wellhead platforms. Due to the huge investment in platform construction and drilling, offshore oil and gas fields can only be developed with a limited number of wells. It is very difficult to adjust and intensify the well pattern, and the degree of oil recovery, oil recovery speed and economic efficiency of the oil field are limited to a certain extent. [0003] Therefore, it is very urgent to invent a well pattern adjustment and well pattern intensification method applied to...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B43/26E21B43/20
Inventor 徐文江陈壁朱伟林丘宗杰刘晓辉彭绪海余焱冰孟宏渠
Owner CHINA NAT OFFSHORE OIL CORP
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