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A downhole evaluation device for sacrificial anode materials

A sacrificial anode and evaluation device technology, used in wellbore/well components, measurement, earth-moving drilling, etc., can solve the problems of downhole fluid scouring, peeling, difficult to collect, etc., and achieve low cost, easy installation and disassembly, and easy to fall off. Effect

Active Publication Date: 2017-10-17
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 problem that the corrosion product of the sacrificial anode is relatively loose when the conventional hanging ring device is used to evaluate the anticorrosion effect of the sacrificial anode material, it is easy to be washed and peeled off by the downhole fluid, and it is difficult to collect. The purpose of the present invention is to provide a downhole evaluation device for the sacrificial anode material

Method used

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  • A downhole evaluation device for sacrificial anode materials

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Embodiment 1

[0023] In order to overcome the problem that the corrosion products of the sacrificial anode are relatively loose, easy to be washed and stripped by downhole fluid, and difficult to collect when evaluating the anticorrosion effect of the sacrificial anode material by the conventional hanging ring device, this embodiment provides a method such as figure 1 The downhole evaluation device for the sacrificial anode material shown includes a non-connecting coupon group 1, a connecting coupon group 2, a sacrificial anode block 4, a product collection tank 5, and a tubing nipple 6. The upper end of the tubing nipple 6 is covered with an upper The locking sleeve 8 has a lower locking sleeve 9 on the lower end, and an insulating inner bushing 7 on the outer side. The outer side of the insulating inner bushing 7 is sequentially covered with a non-connecting hanging piece group 1 and a connecting hanging piece group 2 from top to bottom. , sacrificial anode block 4, the upper and lower end...

Embodiment 2

[0028] On the basis of embodiment 1, this embodiment provides a kind of figure 1 In the downhole evaluation device for the sacrificial anode material shown, in order to facilitate installation and disassembly, the non-connected coupon group 1 is 3 to 6 annular coupons with a thickness of 3mm to 5mm and a height of 50mm to 100mm, and each coupon is provided with There are insulating gaskets, and the connecting hanging piece group 2 is 3 to 6 annular hanging pieces of 3 mm to 5 mm in height and 50 mm to 100 mm in height.

[0029] The materials of the non-connecting coupon group 1, connecting coupon group 2, and connecting screw 3 used in the present invention are consistent with the materials of the protected oil casing and sucker rod, which are N80, J55, P110, 20 # steel or 45 # steel. The number of hanging pieces is selected according to the needs of the site, generally 3 to 6 pieces, all of which are ring hanging pieces of 3mm to 5mm and height 50mm to 100mm. The electrica...

Embodiment 3

[0031] On the basis of embodiment 2, this embodiment provides a kind of figure 1 In the downhole evaluation device for sacrificial anode materials shown, the product collection tank 5 is an upwardly open annular groove made of polyvinyl chloride or nylon, and the insulating inner bush 7 is made of polyvinyl chloride or nylon.

[0032] The product collection tank 5 is an upwardly open annular groove, the size of which is determined according to the actual wellbore space, which is convenient for collecting the corrosion products peeled off from the surface of the anode block, and prevents falling objects from affecting production. Vinyl chloride or nylon are both oil-resistant and anti-corrosion insulating materials.

[0033] Further, the sacrificial anode block 4 contains the following elements: by mass percentage, 5% to 10% zinc, 0.2% to 1.5% indium, 0.2% to 2% magnesium, 0.03% to 0.5% tin, 0.05% to 0.1% % rare earth elements, and the balance is aluminum. The sacrificial anod...

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Abstract

The invention provides an under-well evaluating apparatus for sacrificial anode material. The under-well evaluating apparatus comprises a non-connection hanging parcel set, connection hanging parcel sets, sacrificial anode blocks, product collection tanks and an oil pipe short joint, wherein the upper end of the oil pipe short joint is covered with an upper locking sleeve and the lower end is covered with a lower locking sleeve; the external side of the oil pipe short joint is covered with an insulated lining sleeve; the external side of the insulated lining sleeve is orderly covered with the non-connection hanging parcel set, the connection hanging parcel set and the sacrificial anode block from the top to the bottom; the upper and lower ends of the insulated lining sleeve are both connected with an insulated cushion sheet; the non-connection hanging parcel set is connected with the connection hanging parcel sheet sets via insulated cushion sheets; the connection hanging parcel sheet sets are connected with the sacrificial anode blocks via connection screws; and the lower ends of the sacrificial anode blocks are provided with the product collection tanks. The under-well evaluating apparatus for sacrificial anode material is simply structured, requires low cost, can be easily applied and has short evaluating period; problems that sacrificial anode corrosion products are loosened, easy to be flushed by under-well fluid, peeled and uneasy to be collected can be solved; and protection effect of the sacrificial anode material under different medium conditions can be evaluated.

Description

technical field [0001] The invention relates to the research field of oil and gas field anticorrosion technology, in particular to a downhole evaluation device for sacrificial anode materials. Background technique [0002] Anti-corrosion technologies commonly used in oil and gas wells mainly include corrosion-resistant materials, coatings, and chemical corrosion inhibitors. For the detection and evaluation of anti-corrosion effect, there are mainly methods such as electrochemical monitoring, corrosion hanging ring, multi-arm caliper + electromagnetic thickness measurement (MIT+MTT). However, the cost of electrochemical monitoring and MIT+MTT logging is relatively high, and the testing process is relatively complicated, and special wellbore operation equipment is required. Corrosion hanging rings are widely used. By comparing the blank samples before and after anti-corrosion measures, the internal and external corrosion effects of casing and tubing can be truly and effective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/02E21B47/00
CPCE21B41/02E21B47/00
Inventor 李琼玮赵振峰孙雨来刘伟程碧海付彩利奚运涛王小勇张鑫柱李慧董俊
Owner PETROCHINA CO LTD
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