Zonation method of thin interbed in low infiltration of fracturing layer segment

A technology for fracturing intervals and thin interlayers, which is used in earth-moving drilling, fluid production, wellbore/well components, etc. The effect of improving effectiveness

Inactive Publication Date: 2007-05-09
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, if the judgment of the shielding ability of the interlayer is inaccurate, the fracturing scale will be out of control. If the cracks extend too much into the bottom layer, it will cause low production after fracturing, rapid decline, and short validity period, which will affect the effect of fracturing. ; For thin interlayers, if the fractur

Method used

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  • Zonation method of thin interbed in low infiltration of fracturing layer segment
  • Zonation method of thin interbed in low infiltration of fracturing layer segment
  • Zonation method of thin interbed in low infiltration of fracturing layer segment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, Well Y51-4-S8, GIV6-10 has 6 sublayers in total, the oil layer span is 21.9m, and the largest interlayer is 3.1m. According to conventional technical standards, separate fracturing is not possible, see Table 1.

[0033]

serial number

layers

Small layer number

Perforated section (m)

Thickness (m)

since

to

Mezzanine

shoot away

efficient

1

GIV

10

2236.2

2234.7

58.7

1.5

2

GIV

9

2232.6

2231.2

2.1

1.4

3

GIV

8

2228.1

2222.4

3.1

5.7

4.0

4

GIV

7

2221.7

2219.4

0.7

2.3

1.6

5

GIV

6

2218.6

2216.1

0.8

2.5

2.1

6

GIV

6

2215.3

2214.3

0.8

1.0

1.0

[0034] According to the gamma logging curve in Fig. 1, the gamma values ...

Embodiment 2

[0039] Example 2: Well L12-10 has 5 sublayers from SI1 to SI2-4+5, the span of oil layers is 15.1m, and the largest interlayer is 2.2m. According to conventional technical standards, it cannot be fractured in separate layers. See Table 2.

[0040]

serial number

layers

Small layer number

Perforated section (m)

Thickness (m)

since

to

Mezzanine

shoot away

efficient

1

Si

4+5

1490.4

1488.6

13.9

1.8

0.5

2

Si

4+5

1487.9

1485.2

0.7

2.7

1.9

3

Si

3

1484.4

1482.2

0.8

2.2

1.8

4

Si

2

1480.1

1478.2

2.1

1.9

0.9

5

Si

1

1476.0

1475.3

2.2

0.7

[0041] According to the gamma logging curve, the gamma values ​​of the four interlayers are 124, 127, 136, 150API from bottom to top, and ≥1...

Embodiment 3

[0047] Example 3: Well Y51-10-Xie 10, F4-F5 consists of 3 sub-layers, the oil layer span is 12.5m, and the largest interlayer is 3.5m, which cannot be fractured in separate layers according to conventional technical standards, see Table 3.

[0048]

serial number

layers

Small layer number

Perforated section (m)

Thickness (m)

since

to

Mezzanine

shoot away

efficient

1

F

5

2410.0

2405.4

19.5

4.6

0

2

F

5

2403.2

2402.0

2.2

1.2

0

3

F

4

2398.5

2397.5

3.5

1.0

0

[0049] According to the gamma logging curve, the gamma values ​​of the two interlayers are 160, 200API and ≥120API respectively from bottom to top, and the lithology meets the requirements.

[0050] According to the gamma logging curve, the difference between the high gamma value of the two interlayers...

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Abstract

The present invention relates to a low permeable thin-interbedding fractured interval layering method. Said method includes the following steps: (1) defining effective barrier bed; (2) making restraining barrier protection, adopting low-displacement variable-displacement and low thickener concentration fracture treatment; and (3) making separate layer fracturing treatment. Said method can utilize interbed property, interbed thickness and core intersection to make division of fractured interval and can make the layer whose restraining barrier and oil layer earth stress difference value is greater than 4 MPa and restraining barrier thickness is greater than 2 m implement separate layer fracturing treatment.

Description

Technical field: [0001] The invention relates to a fracturing method for oil recovery in an oil field, in particular to a method for delamination of low-permeability thin interbed fracturing intervals. Background technique: [0002] The oil layers in low-permeability oilfields are mostly thin interbeds. The oil layers are not only thin but also the interlayers between layers are also thin, which brings certain difficulties to the layered fracturing reconstruction and seriously affects the fracturing effect. It is more important to judge the shielding effect of the barrier and control the fracture height, and it is also the difficulty and key to fracturing well selection, layer division and optimal design. In the original fracturing layer layering method, the requirements for interlayer thickness in small-scale hydraulic fracturing are generally greater than 15m for large-scale fracturing, and greater than 5m for small-scale fracturing, with a lower limit of 4m. Many small l...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B49/00
Inventor 张传绪柴立新于永波尹喜永丛德军
Owner DAQING OILFIELD CO LTD
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