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Solid-phase-free multi-functional well completion working solution

A multi-functional, working fluid technology, applied in the direction of wellbore/well components, earthwork drilling, drilling composition, etc., can solve problems such as single function and inability to meet the multifunctional requirements of well completion working fluid, and achieve Avoid the effects of early corrosion

Active Publication Date: 2012-07-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of completion fluids, most of them have single functions, which cannot meet the multifunctional requirements of offshore oil and gas field operations for completion fluids

Method used

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  • Solid-phase-free multi-functional well completion working solution
  • Solid-phase-free multi-functional well completion working solution
  • Solid-phase-free multi-functional well completion working solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Preparation method of multi-functional well completion working fluid:

[0023] Weigh 1-60 tons of inorganic salt, 0.2-20 tons of anti-swelling agent, 0.2-5 tons of viscosifier, 0.2-5 tons of fluid loss reducer, 0.2-2 tons of scale and corrosion inhibitor, and 0.2 tons of fungicide according to the raw material formula. -5 tons;

[0024] refer to figure 1 , pump clean water from clean water tank 1 for 100-300m 3 After filtering through the filter, pump it into the mud tank 6 through the pump A2. While pumping clean water, add 1-60 tons of inorganic salt, 0.2-20 tons of anti-swelling agent, and thickening agent through the dosing funnel 3 in sequence. 0.2-5 tons of agent, 0.2-5 tons of fluid loss reducer, 0.2-2 tons of scale and corrosion inhibitor, 0.2-5 tons of fungicide, the agitator 5 in the mud tank 6 pairs of clean water and medicines added by the dosing funnel 3 Fully stir and circulate through the pump B4 at the same time. After circulating and stirring for ...

Embodiment 2

[0058] Well Kuidong 103 was completed in August 2006. During the first sand control, the packer slips were not seated, and the sand control string fell after losing hands, resulting in objects falling at the bottom of the well. In May 2007, Well Kuidong 103 was overhauled, and the operation period was 38 days.

[0059] Inject clean water 150m into the mud tank 3 , Add 6.5 tons of NaCl and 3.2 tons of KCl under stirring. Under high-speed stirring, add 0.8 tons of PAC, 0.8 tons of CMC, 12470.8 tons of fungicides, and 0.8 tons of scale and corrosion inhibitors sequentially through the dosing funnel. After stirring for 4 hours, it is used in multiple processes such as salvage, sand washing, and perforation.

[0060] During the process of plug drilling and sand flushing, the working fluid stays in the wellbore for more than 72 hours for many times. When it circulates out of the wellbore, its temperature is measured at 36°C and its density remains at 1.06g / cm 3 , Viscosity 28mpa·...

Embodiment 3

[0062] Well Kuidong 1-H1 is the first horizontal well in the Kuidong block in the Liaohe Sea, and was drilled in 2007. The formation pressure of this well is relatively high, and the screen completion method is adopted, and there is a large amount of high-viscosity oil layer protection agent in the horizontal section of the screen. Well completion construction was carried out in August 2008, and the new solid-free multifunctional well completion working fluid showed good performance during the well completion process. When starting to replace the mud, it encounters high-pressure gas in the well, accompanied by ground seepage. Prepare high-density, high-performance working fluid, while killing wells and spraying at the same time. The spraying process was controlled.

[0063] The entire well completion construction, the design use density is 1.20g / cm 3 Working fluid 280m 3 . It is used in various links such as replacing drilling mud, killing wells, and perforating. After r...

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Abstract

The invention discloses a solid-phase-free multi-functional well completion working solution and belongs to the field of oil field chemical industry. The solid-phase-free multi-functional well completion working solution is prepared from the following raw materials in part by weight: 1 to 60 parts of inorganic salt, 0.2 to 20 parts of bulk-proofing agent, 0.2 to 5 parts of tackifier, 0.2 to 5 parts of fluid loss agent, 0.2 to 2 parts of corrosion and scale inhibitor, and 0.2 to 5 parts of bactericide. The solid-phase-free multi-functional well completion working solution has the effects of controlling and cleaning a well, protecting hydrocarbon reservoir and preventing a sleeve from being corroded, and meets the multi-functional requirement of offshore oil and gas field operation on the well completion working solution.

Description

technical field [0001] The invention relates to the field of oilfield chemical industry, in particular to a novel solid-phase-free multifunctional well completion working fluid. Background technique [0002] During the drilling process of oil and gas wells, the drilling will cause certain damage to the formation. These damages are mainly manifested as drilling fluid intrusion into the formation and mud filtrate infiltration, which causes the clay components in the production layer to expand or form a water lock effect; the chemical in the filtrate The treatment agent and the mineral components of the production layer produce jelly or sediment; the clay in the mud invades, all of which will block the pores of the production layer and affect the production. Therefore, in order to ensure the highest production of oil and gas wells, the drilling and completion fluid must be replaced before drilling low-pressure or some unknown production layers, and special drilling and completi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/10C09K8/54C09K8/12
Inventor 袁鹏窦家银刘欢刘德铸刘向明王宝兴张波齐海鹰刘占广张本芳万桂锋唐广杰芮松霞王萍
Owner PETROCHINA CO LTD
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