Solid-phase-free multi-functional well completion working solution
A multi-functional, solid-free technology, applied in the direction of wellbore/well components, earthwork drilling, drilling composition, etc., can solve the problems of single function and inability to meet the multifunctional requirements of well completion working fluid, etc. To achieve the effect of avoiding early corrosion
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Embodiment 1
[0022] 1. Preparation method of multifunctional completion fluid:
[0023] Weigh 1-60 tons of inorganic salt, 0.2-20 tons of anti-swelling agent, 0.2-5 tons of thickener, 0.2-5 tons of fluid loss agent, 0.2-2 tons of scale and corrosion inhibitor, and 0.2 -5 tons;
[0024] Reference figure 1 , Pump 100-300m of clean water from the clean water tank 1 3 After being filtered by the filter, it is pumped into the mud tank 6 through pump A2. While pumping in the clean water, 1-60 tons of inorganic salt, 0.2-20 tons of anti-swelling agent, and viscosity increasing are added through the dosing funnel 3. 0.2-5 tons of fluid loss agent, 0.2-5 tons of filtrate reducer, 0.2-2 tons of scale and corrosion inhibitor, 0.2-5 tons of bactericide, the agitator 5 in the mud tank 6 and the medicine added to the water and the dosing funnel 3 Fully agitate and circulate through pump B 4 at the same time. After 4 hours of circulation and stirring, working fluid will be formed. Valve 7 will be opened and...
Embodiment 2
[0058] Well Kuidong 103 was drilled in August 2006. During the first sand control, the packer slip was not seated. After losing the hand, the sand control string fell, causing falling objects at the bottom of the well. In May 2007, Well Kwaidong 103 underwent an overhaul operation. 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 while stirring. Under high-speed stirring, add 0.8 tons of PAC, 0.8 tons of CMC, 1,2470.8 tons of bactericide, and 0.8 tons of scale and corrosion inhibitor through the dosing funnel. After stirring for 4 hours, it is used in multiple processes such as fishing, sand washing, and perforation.
[0060] In the process of plugging 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, the temperature is measured at 36℃, and the density remains 1.06g / cm 3 , Viscosity 28mpa·s. After the perforation ...
Embodiment 3
[0062] Well Kwaidong 1-H1 is the first horizontal well in the Kuidong block of Liaohe Offshore. Drilling was completed in 2007. The formation pressure of this well is relatively high, and the screen completion method is adopted. A large amount of high-viscosity oil layer protective agent is stored in the horizontal section of the screen. The completion was carried out in August 2008, and the new solid-free multifunctional completion fluid showed good performance during the completion. At the beginning of mud replacement, it encounters high-pressure gas in the well, accompanied by ground seepage. Prepare high-density, high-performance working fluid, while killing wells and blowing out. Controlled the release process.
[0063] The entire well completion construction, the designed use density is 1.20g / cm 3 Working fluid 280m 3 . It acts in various links such as mud replacement, well killing, and perforation. After repeated cycles of well washing, the oil layer protection agent i...
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