Coiled tubing tubular column device and brine discharging and capacity expanding method thereof for salt cavern underground gas storage reservoir

An oil pipe and pipe string technology, which is applied in the fields of oil and gas storage and transportation and resource development, can solve the problems of cavity volume loss, inability to discharge brine, and pipe string blockage, and achieve obvious economic benefits and the effect of increasing gas storage volume.

Active Publication Date: 2017-09-12
中国石油天然气股份有限公司西气东输管道分公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Another object of the present invention is to provide a method for brine discharge and expansion in salt cavern underground gas storage, which solves the contradiction between pipe string blockage and cavity volume loss in the current gas injection brine discharge process, and discharges conventional gas injection In the brine discharge method, the brine at the bottom or low-lying places of the brine chamber cannot be discharged, and the volume of the existing dissolution chamber can be utilized to the greatest extent

Method used

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  • Coiled tubing tubular column device and brine discharging and capacity expanding method thereof for salt cavern underground gas storage reservoir
  • Coiled tubing tubular column device and brine discharging and capacity expanding method thereof for salt cavern underground gas storage reservoir
  • Coiled tubing tubular column device and brine discharging and capacity expanding method thereof for salt cavern underground gas storage reservoir

Examples

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Effect test

Embodiment 1

[0040] A coiled tubing string device, including a coiled tubing 1, a tubing outer card connector 2, a weighted tube 3, a hydraulic safety joint 4, and a rotary flushing tool 5. The schematic diagram of its structure is as follows: Figure 4 As shown, the bottom end of the coiled tubing 1 is connected to the weighted pipe 3 through the outer card connector 2 of the oil pipe, and the other end of the weighted pipe 3 is connected to the rotary flushing tool 5 through the hydraulic safety joint 4 .

[0041] Coiled tubing adopts the outer diameter Ф50.8mm, wall thickness 4.45mm, inner diameter 41.9mm, steel grade CT-90, and the outer card connector of the tubing adopts the products shown in Table 1, such as Figure 5 shown.

[0042] Table 1 Coiled tubing outer card connector parameters

[0043] Coiled tubing size

Tool diameter

Tool inner diameter

quantity

Bottom connection buckle type

place of origin

2.00"

2-7 / 8"

1.5"

1

2-3 / 8"PAC

...

Embodiment 2

[0048] A method for brine discharge and capacity expansion of a salt cavern underground gas storage, the steps of which are:

[0049] 1. Use the conventional gas injection and brine removal technology to carry out brine removal operations on the salt cavern underground gas storage. Based on the sonar measurement and gas injection and brine removal results, select expansion wells from the existing injection and production gas wells of the salt cavern underground gas storage Injection-production wells with large room for capacity expansion and good economic benefits of capacity expansion are used as target wells for capacity expansion. Taking a four port of Jintan Gas Storage as an example, the conventional gas injection and brine discharge cavity has been completed. The utilization rate of the cavity after conventional gas injection and halogen discharge varies from high to low, ranging from 70% to 97%. Less, 7000~65000m 3 , if 80% of the fluid in the cavity is discharged, the...

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Abstract

The invention discloses a coiled tubing tubular column device and a brine discharging and capacity expanding method thereof for a salt cavern underground gas storage reservoir. The coiled tubing tubular column device comprises a coiled tubing, a tubing outside connector, a weighting pipe, a hydraulic safety joint and a rotary washing tool. The brine discharging and capacity expanding method comprises the following steps: firstly, screening a gas storage reservoir waiting for capacity expansion, and determining brine discharging capacity; secondly, installing a coiled tubing operation machine, ground corollary equipment and pipelines; thirdly, installing a well mouth well control device and the coiled tubing tubular column device, and testing sealing performance; fourthly, unloading the coiled tubing tubular column device, and injecting gas for brine discharge; fifthly, washing blocked dregs and discharging brine; and sixthly, taking out the coiled tubing tubular column device and a brine discharging tool. Brine discharge and capacity expansion are carried out by adopting the coiled tubing tubular column device, the coiled tubing can be arranged into a cavity bottom or the dregs, the blocked dregs can be effectively washed by using the rotary washing tool, a brine discharging passage can be formed again, and smaller than 20% of residual brine remaining at the bottom of the cavity incapable of being discharged in a traditional brine discharge pipe can be effectively discharged.

Description

technical field [0001] The invention belongs to the field of oil and gas storage and transportation and resource development, and in particular relates to a coiled tubing string device for discharging brine at the bottom of a salt cavern gas storage, and a method for discharging brine and expanding the capacity of the underground salt cavern gas storage using the device. Background technique [0002] During the construction of the salt cavern gas storage, impurities in the salt rock and interlayers and other water-insoluble substances cannot be discharged out of the cavity along with the brine during the cavity building process, but accumulate at the bottom of the cavity. Considering that the interlayer has high strength and its failure mode is complex, the shape of the accumulation body formed after failure is quite different; at the same time, the blocks of different sizes in the accumulation body overlap and support each other, so that the formed accumulation body contains...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B17/00E21B21/00
CPCE21B17/00E21B21/00E21B43/168Y02E10/10
Inventor 杨海军李龙李建君巴金红杨春和陈锋汪会盟陈加松王同涛张青庆
Owner 中国石油天然气股份有限公司西气东输管道分公司
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