Digital Separated-Zone Water Injection Technologies with Cable-PresetDownhole Flexible Composite Pipe

YANG Lingzhi; ZHOU Zhiping; YANG Haien; LI Falong; HU Gaixing

doi:10.11911/syztjs.2022057

Volume 50 Issue 6

Dec. 2022

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Petroleum Drilling Techniques > 2022 > 50(6): 120-125. > DOI: 10.11911/syztjs.2022057

YANG Lingzhi, ZHOU Zhiping, YANG Haien, et al. Digital separated-zone water injection technologies with cable-preset downhole flexible composite pipe [J]. Petroleum Drilling Techniques，2022, 50(6)：120-125. DOI: 10.11911/syztjs.2022057

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Digital Separated-Zone Water Injection Technologies with Cable-PresetDownhole Flexible Composite Pipe

YANG Lingzhi^{1, 2},
ZHOU Zhiping^{1, 2},
YANG Haien^{1, 2},
LI Falong³,
HU Gaixing^{1, 2}

1.
Oil & Gas Technology Research Institute, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi, 710018, China
2.
National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Fields, Xi’an, Shaanxi, 710018, China
3.
No.1 Oil Production Plant, PetroChina Changqing Oilfield Company, Yan'an, Shaanxi, 716009, China

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Received Date: January 01, 2022
Revised Date: July 09, 2022
Available Online: November 14, 2022

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Abstract

Abstract

Separated-zone water injection string in low-permeability oilfields is challenged by various problems after a long time in service, e.g. severe corrosion, scaling, and rapid decrease of separated-zone water injection conformity rate. To solve these problems, a digital separated-zone water injection string with a technology of cable-preset downhole flexible composite pipes was designed. The key tools, i.e. an intelligent water distributor and a cable-penetrated packer, were developed. Further, the key performances, including external pressure resistance and tensile strength, of the string were evaluated in laboratory. Separated-zone water injection technologies with flexible composite pipes suitable to downhole high-pressure were thereby developed. The laboratory evaluation results demonstrated that the developed string met the requirements on the packer setting pressure in separated-zone water injectors and the maximum external pressure resistance. The measurement error of the intelligent water distributor flow rate was below 2%. Field tests were carried out in four wells. The maximum service time was over 2 years, and the conformity rate of separated-zone water injection was 100%. This study indicates that the application of flexible composite pipes in cable preset digital separated-zone water injection technologies can effectively improve corrosion resistance, achieve automatic measurement and adjustment of separated-zone flow, remote sealing verification, and data monitoring, meet the requirements of packer setting, reverse circulation, and subsequent tests, all of which showcase promising application effects.

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