Study and Application of a High Density Oil Base Drilling Fluid with High Temperature Resistance of 220℃
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摘要: 针对超高温深井、超深井钻井液体系抗温能力不足、使用密度低、动态沉降稳定性差等问题,研制出抗温220℃的乳化剂、增黏剂、降黏剂及最高使用密度为2.30 g/cm3的油基钻井液配方。室内评价结果表明,超高温乳化剂SD-HTPE和SD-HTSE对钻井液的流变性影响小,220℃热滚后破乳电压达到1201~1856 V;超高温增黏剂SD-OIV可使体系的LSRYP由3 Pa增大至13 Pa,动态沉降稳定系数由0.2096增大至0.6466,高温高压滤失量降低率最高达76.74%;超高温降黏剂SD-ORV可使体系LSRYP降低85.71%;体系在220℃、40 MPa、低剪切速率下具有良好的动态循环流变性及热稳定性。该套体系在川南塔探1井得到成功应用,应用结果表明,超高温高密度油基钻井液体系在214℃下热稳定性、流变性、沉降稳定性和高温高压滤失量等性能较好,施工过程无阻卡,起下钻顺利,具有良好的现场应用效果,满足超高温深井、超深井的钻井需求。Abstract: Most drilling fluids have various disadvantages such as low temperature stability, low density and poor circulating suspending capacity when used to drill ultra-high temperature deep and ultra-deep wells. An oil base drilling fluid with the highest density of 2.30 g/cm3 has been developed to solve these problems. The drilling fluid was formulated with newly developed emulsifiers, viscosifier and thinner with high temperature resistance of 200℃. Laboratory evaluation showed that the ultra-high temperature emulsifiers SD-HTPE and SD-HTSE have little effect on the rheology of the drilling fluid. After hot rolling at 220℃, the emulsion stability of the drilling fluid was 1201-1856 V. The ultra-high temperature viscosifier SD-OIV can increase the LSRYP from 3 Pa to 13 Pa and the dynamic settlement index from 0.2096 to 0.6466. HTHP filter loss of the drilling fluid can be reduced by 76.74%. The ultra-high temperature thinner SD-ORV can reduce the LSRYP of the drilling fluid by 85.71%. The drilling fluid had good dynamic circulating rheology and thermal stability at 220℃, 40 MPa and low shear rates. Application of this drilling fluid in Well Tatan-1 in south Sichuan showed that the ultra-high temperature high density oil base drilling fluid had good thermal stability, rheology, settlement stability and HTHP filter loss at 214℃. No tight spots and drag were encountered during drilling, and tripping was conducted smoothly. Field application of this drilling fluid proved that it satisfied the requirements of drilling ultra-high temperature deep and ultra-deep wells.
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Key words:
- Oil base drilling fluid /
- Ultra-high temperature /
- Settlement stability /
- Deep well /
- Ultra-deep well
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