双管柱筛管完井技术在沁水煤层气区块水平井开发中的应用

doi:10.13809/j.cnki.cn32-1825/te.2020.04.009

Abstract

Abstract:

The damage of coal-rock reservoir completion fluid and the easy collapse of horizontal wells are the main factors limiting the output of coalbed methane horizontal wells in Qinshui area. In terms of the resulting problems of low horizontal well production and production reduction, the integrated technology of dual-tubing screen completion and production increasing is used to solve the problems of damage to coal seam caused by completion fluid of horizontal wells of coalbed methane and the instability of open hole wall of coal seam. Therefore, one-trip drilling of completion and flushing operation is realized, the output of single CBM well is improved, and the stable production cycle of a CBM well is extended. The dual tubing completion structure of a horizontal CBM well consists of an outer screen system and an inner flushing system. The outer screen system can realize the long time support of the shaft wall and prevent the collapse, while the inner flushing system can establish the completion fluid circulation channel, realize the function of hydraulic jet, pollution prevention, sand flushing and well cleaning, reduce the resistance encountered of screen pipe entering, and improve the success rate of screen pipe entering in just one-time. This process is the main method to develop horizontal wells in Qinshui CBM Block. A series of screen pipes and supporting tools with an outer diameter of 73 mm, 89 mm and 110 mm have been developed, and this technology has been popularized and applied in 331 horizontal CBM wells. Compared with the open-hole horizontal wells developed in the year before 2014, the stable production cycle of the screen completion horizontal wells is increased by more than 5 times, and the single well production of the horizontal wells of 15# coal seam has exceeded 1 000 m ³ to the fundamentally solve technical difficulties in development. A new efficient development mode suitable for the horizontal wells in the refreshing water coalbed methane block is formed.

Key words: coalbed methane, horizontal well, dual tubing, screen completion, increase production

CLC Number:

TE257

XIAN Baoan,WANG Li,ZHANG Xiaobin,BI Yansen,ZHANG Zhou. Application of double string screen completion in horizontal wells of Qinshui CBM Block[J].Reservoir Evaluation and Development, 2020, 10(4): 59-62.

Figures/Tables 8

Fig. 1

Fig. 2

Fig. 3

Table 1

Table 2

Well structure of dual-tubing screen completion"

开钻次序	钻头尺寸/mm	套管尺寸/mm	套管/筛管下入深度	水泥封固井段
一开	$?$ 311.15	$?$ 244.50	一开井底	地面—井底
二开	$?$ 215.90	$?$ 177.8	距二开井底2 m	地面—井底
三开	$?$ 152.4	筛管	完井管串悬挂在技术套管上距离浮鞋30 m内,下深距离井底少于50 m	不固井

Table 2

Fig. 4

Fig. 5

Fig. 6

References 19

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参数名称	参数值
工具总长/mm	1 200
外径最大值/mm	152
球座内孔径/mm	40
冲管接头内孔径/mm	50
坐封销钉剪切压力/MPa	2~4
循环通道打开销钉剪切压力/MPa	14~18
丢手后最大通径/mm	100

Application of double string screen completion in horizontal wells of Qinshui CBM Block

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