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Casing liquid flowback device

A flowback and casing technology, applied in wellbore/well valve devices, production fluids, wellbore/well components, etc., can solve problems such as heat loss, improve service life, good economic benefits, and reduce heat loss Effect

Pending Publication Date: 2022-03-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defect of heat loss caused by the annulus accumulation problem of the existing steam huff and puff wells and steam flooding wells, the present invention proposes a casing fluid flowback device, which can remove the annulus fluid accumulation in the steam flooding and steam huff and puff strings. Discharged into the oil pipe to reduce heat loss during steam injection and improve steam utilization

Method used

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  • Casing liquid flowback device
  • Casing liquid flowback device

Examples

Experimental program
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Embodiment 1

[0029] A casing fluid flowback device is installed on a heat insulating oil pipe 1 and located above a packer 2 of the heat insulating oil pipe 1, and the casing fluid flowback device is arranged close to the packer 2.

[0030] Its structure includes:

[0031] The oil pipe coupling 19 is used to connect with the heat-insulated oil pipe 1; it is not easy to cause fatigue fracture, and the connection effect is good;

[0032] The inner wall of the bottom of the oil pipe coupling 19 is connected with an upper short connection pipe 3, and the outer wall of the upper short connection pipe 3 is sleeved with a fixed cap 4, and the fixed cap 4 is provided with a liquid inlet 401;

[0033] The outer wall of the bottom of the fixed cap 4 is inwardly recessed to form a clamping groove, and the top end of the outer tube 5 is engaged with the clamping groove. A Tesla valve is provided between the outer pipe 5 and the upper short connection pipe 3, and the Tesla flow channel 8 of the Tesla ...

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PUM

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Abstract

The invention discloses a casing liquid flowback device, which relates to the technical field of thickened oil development and comprises an upper short connecting pipe, a fixing cap, a pressing cap, a filter screen, a Tesla valve, an outer pipe, a central pipe, a ball valve, a spring, a top ring, an adjusting nut, an anti-collision ring, a lower short connecting pipe and the like. The heat loss of injected steam is reduced, the steam utilization rate is improved, and good economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of heavy oil development, in particular to a casing fluid flowback device Background technique [0002] Heavy oil is crude oil with high asphaltene and colloid content and high viscosity. Crude oil with a surface density greater than 0.943 and an underground viscosity greater than 50 centipoise is usually called heavy oil. Because of its high density, heavy oil is also called heavy oil. Heavy oil reservoirs generally adopt steam flooding, steam stimulation and other development methods, that is, high-temperature steam is injected into the ground to increase the temperature of the heavy oil and reduce the viscosity. Therefore, the dryness and temperature of bottom-hole steam are important indicators to ensure the utilization efficiency of injected steam, and reducing steam heat loss along the way is an important research topic for thermal recovery of heavy oil. [0003] During the implementation of steam h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/38E21B34/06
CPCE21B43/24E21B43/38E21B43/35E21B34/06Y02E10/10
Inventor 陈鹏魏凯袁爱武阴艳芳田野董亮伍宇博胡燕许佳赛刘锦谢恺泽赵江利
Owner PETROCHINA CO LTD