A kind of brine mining well casing maintenance device and method

A well casing and casing technology is applied in the field of casing maintenance devices for brine mining wells, which can solve the problems of small production wellbore, high pump pressure, corrosion, etc. The effect of production costs

Inactive Publication Date: 2018-03-13
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the serious corrosion of existing downhole casings, resulting in smaller and smaller production boreholes, high pump pressure, low production, and affecting investment results, the present invention provides a casing maintenance device and method for brine production wells. The size of the wellbore is fixed, the circulation displacement remains unchanged after maintenance, the corrosion rate of the casing is reduced, the service life of the casing is extended and the hidden danger of the shrinkage of the wellbore size is eliminated, and the purpose of prolonging the production cycle of the brine production well under the condition of the conventional circulation displacement

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of brine mining well casing maintenance device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In order to overcome the serious corrosion of the existing downhole casing, which leads to smaller and smaller production boreholes, high pump pressure, low production, and impact on investment effects, the invention provides such as figure 1 Shown is a casing maintenance device and method for brine mining wells. The invention ensures the fixed size of the wellbore, keeps the circulation displacement unchanged after maintenance, reduces the casing corrosion rate, prolongs the service life of the casing and eliminates the problem of shrinking the size of the wellbore. Hidden dangers, to achieve the purpose of prolonging the production cycle of brine extraction wells under the condition of conventional circulation displacement.

[0029] A casing maintenance device for brine production wells, comprising a wellbore 1, a casing 2, an oil pipe 3 and a casing corrosion section 5, the casing 3 is fixed in the wellbore 1, and the casing on the casing 2 is corroded The upper and ...

Embodiment 2

[0037] Based on the above embodiments, in this embodiment, the upper packer 6 and the lower packer 7 have the same structure, and both are rubber barrel packers.

[0038] The inner packer 8 is a rubber barrel packer, and the inner packer 8 is smaller than the upper packer 6 .

[0039] Thirty through holes are opened on the oil pipe 3 at the corrosion section 5 of the casing.

[0040] The through hole is a φ12-16mm through hole. The diameter of these through holes is φ14 in this embodiment. Such holes can be evenly distributed on the oil pipe 3 or randomly distributed, and the purpose is to connect the oil pipe 3 and the casing 2 so that the electrolyte can circulate smoothly.

Embodiment 3

[0042] On the basis of the above-mentioned embodiments, a casing maintenance method for brine production wells is provided in this embodiment, which is characterized in that: the specific steps are:

[0043] Step 1 Determine the casing corrosion section 5 to be maintained, and scrape the casing 2 of the casing corrosion section 5 to expose the original metal surface;

[0044] Step 2: Lower the tubing 3 with the upper packer 6 and the lower packer 7 into the well, and make the casing corrosion section 5 located between the upper packer 6 and the lower packer 7;

[0045] Step 3 Pressurize the wellhead. When the wellhead pressure is 3MPa, the upper packer 6 and the lower packer 7 are set to isolate the casing 2 in the casing corrosion section 5;

[0046] Step 4 Lower the hollow sucker rod 4 with the inner packer 8 into the well, and the inner packer 8 is located on the corrosion section 5 of the casing;

[0047] Step 5 Pressurize the wellhead. When the wellhead pressure is 5MPa,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a brine well casing pipe maintenance device, comprising a borehole, a casing pipe, an oil pipe and a casing pipe corrosion section, wherein the casing pipe is fixed in the borehole, and an upper packer and a lower packer are respectively arranged at the upper end and the lower end of the casing pipe corrosion section of the casing pipe; the oil pipe is positioned in the casing pipe, a hollow sucker rod is arranged in the oil pipe, an internal packer is arranged between the hollow sucker rod and the oil pipe, and the internal packer is positioned between the upper packer and the lower packer; annular spaces are respectively formed at the positions, where the oil pipe and the casing pipe corrosion section are arranged, of the casing pipe; a plurality of through holes are formed in the oil pipe at the casing pipe corrosion section. The brine well casing pipe maintenance device has the characteristics that the original size of the original borehole is ensured, so that the cyclic discharge capacity of the maintained casing pipe is constant, the casing pipe corrosion speed of a brine well is slowed down, the hidden danger caused by the reduction of borehole size is eliminated, and the aim of prolonging the production cycle of the brine well under the circumstances of conventional cyclic discharge capacity is achieved.

Description

technical field [0001] The invention relates to the technical field of brine mining well workover, in particular to a brine mining well casing maintenance device and method. Background technique [0002] Vertical well-horizontal well drilling group brine extraction is a new technology developed in recent years for underground brine, that is, one is a vertical well, the other is a horizontal well, the two wells are connected, and the two wells use brine circulation to dissolve and circulate the underground gypsum salt Take it out of the ground, separate the workshop, and continue the cycle. With the in-depth development of this technology, it has been gradually applied all over the country. Due to the nature of brine and the characteristics of the casing used, there are the following problems: [0003] The circulating brine has high solubility and takes a long time, which causes serious corrosion of the downhole casing. At present, the casing of the new well will be corroded...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/10E21B33/12
CPCE21B17/1085E21B33/12
Inventor 杨博孙亚莉
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap