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Composite drainage gas production string and its method for discharging fluid in "lying well"

A gas production pipe and liquid accumulation technology, which is applied to the components of pumping devices for elastic fluids, wellbore/well components, drilling pipes, etc., can solve the problems of high construction cost, difficulty in electric power, and high input-output ratio. Achieve the effect of increasing corrosion resistance and impact resistance, efficient drainage technology, and improving construction efficiency

Active Publication Date: 2022-05-24
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to factors such as high construction cost, long period, and difficulty in maintenance of downhole pump body, the mechanical pumping technology has seldom been applied on site. The electric submersible pump drainage technology has poor promotion effect due to factors such as complicated construction, difficult power supply and environmental protection. Nitrogen Gas lift drainage technology is difficult to promote due to unfavorable factors such as high construction cost, short duration of construction effect, and high input-output ratio

Method used

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  • Composite drainage gas production string and its method for discharging fluid in "lying well"
  • Composite drainage gas production string and its method for discharging fluid in "lying well"
  • Composite drainage gas production string and its method for discharging fluid in "lying well"

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown in the figure, the composite drainage gas production pipe string used for "lying well" downhole liquid discharge includes a plunger blowout preventer 1, a plunger ground control system 2, a Christmas tree 3, a plunger 4, a velocity string 5, a pipe Column joint 6, packer 7 and ball seat 8; wherein, plunger blowout preventer 1, Christmas tree 3, velocity string 5, pipe string joint 6, packer 7 and ball seat 8 are in order from top to bottom connection; the plunger ground control system 2 is connected with the plunger blowout preventer 1; the plunger 4 is arranged in the velocity pipe string 5, so that it can move up and down in the velocity pipe string 5;

[0035] The plunger blowout preventer 1, the plunger ground control system 2 and the Christmas tree 3 are all commercially available products; among them, the plunger blowout preventer 1 has the functions of plunger throwing, taking out and capturing, and is connected to the Christmas tree throug...

Embodiment 2

[0049] The bottom-hole drainage gas production construction realized by the composite drainage gas production pipe string used for "lying well" downhole liquid discharge in Example 1, its specific implementation steps are as follows:

[0050] S1. Connect the velocity string 5, the string joint 6, the packer 7 and the ball seat 8 in sequence from top to bottom to form a downhole composite gas production string;

[0051] S2. According to the depth of the liquid level in the downhole, according to the measurement results of the depth of the liquid level, the structure of the wellbore and the position of the reservoir, design the running position of the downhole composite gas production string;

[0052] S3, run the gas production pipe string into the wellbore design position by using the speed pipe string 5 running supporting equipment, and cut off the redundant speed pipe string 5, and connect it with the gas tree 3 through the wellhead device;

[0053] S4. Put soluble balls 9 in...

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Abstract

The invention discloses a composite drainage and gas production pipe string used for discharging fluid in a "lying well" underground, including a plunger blowout preventer, a plunger ground control system, a gas production tree, a plunger, a velocity pipe string, and a pipe string joint , packer and ball seat; the plunger blowout preventer is set above the gas tree and connected with the gas tree, the plunger ground control system is connected with the plunger blowout preventer; the top of the velocity string is connected with the gas tree, The bottom end is connected to the top end of the packer through the pipe string joint, and the ball seat is threadedly connected to the bottom end of the packer; the plunger can be set in the velocity pipe string reciprocatingly along the pipe string; the packer adopts pressure setting , lifting and unsealing packer; the maximum outer diameter of the string joint, packer and ball seat is consistent with the inner diameter of the velocity string; the composite drainage and gas production string and its method can continuously and efficiently " The bottom of the well is discharged without other energy sources, and the implementation process has the characteristics of cleanliness and environmental protection.

Description

technical field [0001] The invention relates to the technical field of drainage gas production engineering of natural gas reservoirs, in particular to a composite drainage gas production pipe string and a method thereof for discharging liquid accumulated in a "lying well" well. Background technique [0002] Gas wells generally produce water. In natural gas exploitation, with the reduction of gas reservoir pressure and natural gas production, the production cannot meet the critical liquid-carrying flow rate, and the produced water or condensate will gradually stay at the bottom of the well to form liquid accumulation, and the number of wells is increasing. Bottom effusion will seriously affect the gas production efficiency, and some wells with effusion will even be crushed to death, unable to produce and suffer serious losses. In the Sulige gas field alone, there are thousands of "laying wells" that cannot be produced due to serious liquid accumulation at the bottom of the we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B17/00E21B33/06E21B33/03F04B53/14F04B53/00
CPCE21B43/00E21B17/00E21B33/06E21B33/03F04B53/14F04B53/003
Inventor 杨晓勇冯强杨永青周后俊崔海军李东林鲍作帆成琪秦诗涛张秀青
Owner CNPC BOHAI DRILLING ENG
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