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DG high temperature liquid interior of isolation


DG isolation 2.3.1 experiment with drilling fluid compatibility test drilling: Xu depth of 21 wells (4273m), isolation liquid formula 4 #, compatibility test data shown in Table 4. Table 4DG compatibility with the fluid isolation fluid test data in Table 2.3.2 compatibility with the latex cement slurry formula: G +18 SBR grade cement, isolation liquid formula is 3 #, compatibility test data shown in Table 5. Table 5DG compatibility with SBR slurry test data table shows the compatibility test data,Oakley sunglasses sale, DG isolation fluid and drilling fluid, styrene-butadiene latex cement slurry mixed in different proportions, the fluid rheological properties, and to some extent dilution effect on the drilling fluid are conducive to the construction site. 2.4 anti-pollution test slurry thickening (G grade cement +189 / 6 SBR) and the DG isolation solution (4) 1:1 mixture, thickening to do anti-pollution test, the test data as shown in Figure 1 and Figure 2. Thickening experimental temperature of 120 ℃, pressure of 70MPa. SBR slurry thickening time (80BC) is 126min, DG isolation liquid mixed with the slurry 1:1 in the same experimental conditions, the thickening time (80BC) is 163min,tory burch outlet, slightly extended thickening time, DG isolation solution that to some extent, there is delay in the slurry thickening time role, to meet the requirements of the construction site. 62 Western Exploration Engineering 2007 3 10080 60 {carp exposed 4020060120 analogy time (min) Figure 1 curve slurry thickening time (rain) Figure 2 isolation liquid mixed with water 1:1 slurry thickening experimental curve 2.5 ability to detect salt-liquid separation system, salt resistance, at room temperature, select the 4 isolation liquid, the density of 1.50g/cm3, change the dosage of NaCl, measuring six-speed fluid system isolation. The results shown in Table 6. Isolation of the experimental data show that liquid salt, NaCl increases the amount of change does not affect the isolation fluid rheology, DG liquid separation system has good salt tolerance, can be applied to high salinity formation environment. Table 6 Experimental data of isolated liquid salt water loss reduction in Table 2.6 DG liquid separation system performance cross-linking the polymer cross-linking reaction to form three-dimensional network structure, the isolation fluid system has a good fluid loss the role of water. In the test temperature of 150 ℃, pressure 7MPa conditions, experimental time of 30min. Different proportion of isolated liquid fluid loss test data in Table 7. Table 7 plus the amount of influence on the effect of fluid loss test data table number 1234567 water loss (mL) 49454238363218 experimental data show that at 150 ℃ high temperature conditions, the isolation fluid DG system has a good ability to reduce water loss, water loss can be controlled In less than 50mL. Composite test from the test results, DG liquid separation system has good stability and suspension rheology,knock off oakleys, mud and drilling fluids compatible with water,tods shoes outlet, there is slow water slurry thickening time, anti temperature up to 150 ℃, dehydration 50mL below. Isolate the performance liquid systems have reached a higher level to meet the on-site construction requirements. 3 Field Applications Xu Daqing oilfield deep well 13, depth of 4860m, ​​the two-stage cementing process. A cementing Section 2517m. From 4840 ~ 2323m, with Class G cement, silica sand +18 +25 styrene-butadiene latex, slurry density 1.90g/cm3; two cementing sections 2310m, from 2516 ~ 500m, with a high-strength low-density cement +1. 5 fluid loss agent. Slurry density 1.60g/cm3. Isolation medium density 1.35g/cm3, a spacer annulus height of 600m, well cementing, back out of the isolation liquid interface clear. Isolation solution that can effectively separate the drilling fluid. Cementing quality improved significantly. 4 Conclusion DG isolation system is a viscous liquid liquid separation, density, wide adjustment range can be 1.1 ~ 1.7g/cm. Free adjustment; at 150 ℃ high temperature conditions, still has good suspension stability; salt resistance,ed hardy uk, and can be applied to the high salinity of the environment; less water loss; the slurry thickening time delay effect; flow degeneration good compatibility with water, mud and drilling fluids; isolation effect is obvious, can significantly improve cementing quality. References: r1] Jin-Zhou Zhao, Zhang Guilin. Drilling Engineering Manual t-M]. China Petrochemical Press, 2005,2. [2] Zong Jian, Huang Bozong, Xu same stage. Oil and gas well cementing theory t-M]. Beijing: Petroleum Industry Press, 2001: l15 a l16. E33 Wangqi Chun, Zhou Shiming, nest in your industry. MS-R high-density liquid separation of research and application [J]. Address and recovery of oil and gas, 2005 (5) :68-69
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