Liquid discharging and gas production integrated method after low-pressure water-bearing reservoir fracturing reconstruction

A gas production and reservoir technology, which is applied in the field of integration of liquid drainage and gas production after fracturing of low-pressure water-bearing reservoirs, can solve problems such as low formation pressure, insufficient energy, and inability to produce oil and gas by blowing through, with less difficulty in achieving , the effect of short technical cycle

Pending Publication Date: 2021-02-19
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the integrated method of liquid drainage and gas production after fracturing of low-pressure water-bearing reservoirs provided by the present invention is to overcome the failure of conventional liquid drainage technology after fracturing of low-pressure water-bearing reservoirs in the prior art due to low formation pressure and insufficient energy. Oil and gas production through spraying in time, and conventional drainage and gas recovery technology cannot realize continuous drainage and gas recovery in water-bearing reservoirs

Method used

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  • Liquid discharging and gas production integrated method after low-pressure water-bearing reservoir fracturing reconstruction

Examples

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Embodiment 1

[0023] like figure 1 As shown in the figure, an integrated method for liquid drainage and gas production after fracturing of a low-pressure water-bearing reservoir, comprising the following steps: 1) after the completion of fracturing and fracturing of a gas well, run a coiled tubing drainage pipe into the tubing or casing wellbore The column string is drained;

[0024] 2) When the bottom-hole liquid level in the tubing drops below the perforation section, the fluid in the tubing stops draining and gas production starts; when the bottom-hole liquid level in the tubing rises to the set height, gas production is stopped, and the gas production is continued. The oil pipe drain string is drained again, and the above step 2) is repeated until the liquid drain is completed in the oil pipe, so as to realize the integration of liquid drain and gas production in the oil pipe;

[0025] 3) When the liquid drainage in the casing is completed, firstly pull out the coiled tubing drainage s...

Embodiment 2

[0029] On the basis of Example 1, further, the coiled tubing drainage string includes a cable 1, a coiled tubing 2 and an automatic start-stop pump. The cable 1 is located inside the coiled tubing 2, and the lower end of the cable 1 is connected to the automatic start-stop pump. After the fracturing of the gas well is completed, run the coiled tubing drainage string in the tubing or casing 3 wellbore to drain the liquid. When the liquid level rises to the liquid level that needs to be drained, the pump will automatically start and stop to drain the liquid. The liquid is discharged to the ground through the coiled tubing 2. When the liquid level drops below the liquid level that needs to be discharged, the pump will automatically start and stop. After the liquid discharge is completed, gas production starts, which realizes continuous intelligent drainage and gas production of water-bearing reservoirs, with a high degree of automation. , shorten the drainage cycle, and reduce the...

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Abstract

The invention belongs to the technical field of fracturing reconstruction oil-gas well production increasing, and particularly provides a liquid discharging and gas production integrated method afterlow-pressure water-bearing reservoir fracturing reconstruction. The method comprises the following steps that after gas well fracturing reconstruction is finished, a continuous oil pipe liquid discharging pipe column string is put into an oil pipe or a sleeve shaft for liquid discharging, and after that liquid discharging of the oil pipe is finished is judged, gas production is started; and afterthat liquid discharging of a sleeve is finished is judged, the continuous oil pipe liquid discharging pipe column string is pulled out firstly, then a gas production pipe column is put into the sleeveshaft, the continuous oil pipe liquid discharging pipe column string is put into the gas production pipe column for liquid discharging of the gas production pipe column, and after liquid dischargingof the gas production pipe column is finished, gas production is started. The problems that after water-bearing reservoir fracturing reconstruction, a conventional liquid discharging technology is long in period and high in difficulty are solved, the liquid flowback rate after water-bearing reservoir gas well fracturing is increased, the liquid discharging period is shortened, the damage such as fracturing fluid sticking is reduced, and finally the water-bearing reservoir recovery ratio is increased.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well stimulation by fracturing, and in particular relates to an integrated method for liquid drainage and gas production after fracturing and reforming of low-pressure water-bearing reservoirs. Background technique [0002] After the fracturing of oil and gas wells in low-pressure water-bearing reservoirs, the fracturing fluid and formation water flowback technologies injected into the formation mainly involve tubing oil-draining and drainage technology, tubing swabbing and drainage technology, liquid nitrogen lifting and drainage technology, and coiled tubing flowback technology. technology, etc. However, due to low formation pressure and insufficient energy after fracturing of low-pressure water-bearing reservoirs, conventional liquid drainage technology cannot realize timely gas and gas production, and conventional drainage gas recovery technology cannot realize continuous gas production. ...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/38E21B47/047
CPCE21B43/122E21B43/38
Inventor 韩巧荣李宪文张燕明周长静牟春国何明舫孟磊梁凌云王历历傅鹏
Owner PETROCHINA CO LTD
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