Introduction of Zhongyuan Baimiao Horizontal Well No.1 construction

Horizontal Well Fracturing for Zhongyuan Oilfield

1. Profile

On October 6, 2011, 7-section fracturing is performed for horizontal section 5 1/2” casing of Baimiao horizontal Well-1, with the completion tools and technical service provided by Beijing Baihengda Petroleum Technology Co., Ltd.; the horizontal section is from 3861.5m to 4357.0m with the total length of 495.5m, corresponding vertical depth of 3729-3803m, and vertical thickness of 74m.

The well is drilled mainly for the purpose of performing the pilot test for horizontal wells in deep low-permeability tight gas reservoirs;

Multi-stage fracturing is conducted for the reservoir in order to maximize the productivity contribution and improve the development effect;

The multi-stage fracturing completion technology and fracturing technology are improved with the aid of foreign advanced technologies;

Important technical parameters are provided for development of horizontal wells in deep low-permeability tight gas reservoirs;

2. Design scheme of the fracturing string

The completion tool is designed by adopting Frac-Point TM multi-layer fracturing completion system. According to the 7-section fracturing requirements, one top-casing suspension packer, 7 external-casing packers, 6 ball-injection sliding sleeves, one differential sliding sleeve, one WIV well-hole isolation valve, and one float shoe are required (as shown in the figure below).

Horizontal Well Fracturing for Zhongyuan Oilfield

        Diagram for Completion Tool of Baimiao-horizontal Well-1


 

Quantity
数量

OD. inch

外径尺寸

ID. inch

内径尺寸

顶部封隔器Top packer

1

4.45

2.87

管外封隔器External-casing packer

7

4.35

2.81

投球滑套Ball-injection sliding sleeve

6

4.35

2.81(球座ID:1.525-2.150

2.81ball seat ID:1.525-2.150

压力滑套Differential sliding sleeve

1

4.35

2.31

井筒隔离器Wellbore isolation valve

1

4.35

1.0(座封球:1.25)

1.0(setting ball: 1.25)

浮鞋Float shoe

1

4.35

 

 

生产滑套

5½ production sliding sleeve

裸眼封隔器x7

Open hole packer x7

服务工具

Service tool

头球打开滑套x6

Ball-injection sliding sleeve x6

顶部回接密封筒

Top tie-back seal chamber

压力打开滑套

Differential sliding sleeve

S3顶部悬挂封隔器

S3 Top suspension packer

井筒隔离阀

Wellbore isolation valve

3½”油管(尾管)9.2# ID76mm

3½” oil pipetail pipe9.2# ID76mm

浮鞋

Float shoe

压裂分隔单元

Fracturing isolation unit

 

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