Contamination Control Technique for Safe Drilling in Ultra-Thick Asphalt Layers in Y Oilfield
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摘要: 为解决Y油田超厚沥青层安全钻井技术难题,开展了沥青层分强度控制技术研究。通过高温高压砂床滤失试验、沥青乳化试验、堵漏试验和沥青硬化试验,优选了随钻堵漏浆配方、乳化剂最佳加量、化学堵漏浆配方、硬化剂。室内试验结果表明,随钻堵漏技术可以有效防止沥青侵入井筒;乳化剂RHJ-3加量达到沥青的20%时,能有效降低钻井液的黏度和切力,保持其性能稳定;优选的化学固结堵漏浆对渗透性地层具有良好的封堵效果;硬化剂YHJ-5可以将沥青的软化点提高75 ℃。随钻堵漏技术使F18井沥青层全烃值由87.98%降至23.40%,有效阻止了沥青侵入;乳化降黏技术使F02井沥青层钻井液漏斗黏度保持在62 s;化学堵漏技术使F19井地层承压能力提高0.2 g/cm3;沥青硬化技术在F17井应用后钻井液污染量降低19.5%;S03井采用"专封专打"井身结构和应用控压钻井技术安全钻穿了厚158.00 m的沥青层。超厚沥青层分强度处理技术能有效解决Y油田沥青层安全钻进的技术难题。Abstract: To achieve safe drilling in the ultra-thick asphalt layers of Y Oilfield, a contamination control technique was developed.By means of a HTHP sand bed filtrate test, an asphalt emulsifying test, a plugging test and an asphalt hardening test, an optimal plugging slurry formula, emulsifier dosage, chemical plugging formula and asphalt hardener were confirmed.Laboratory studies showed that the plugging while drilling technology could effectively prevent asphalt from invading into the wellbore and that adding emulsifier (RHJ-3) up to 20% (W/W) of asphalt could effectively reduce drilling fluid viscosity and shear force and keep it stable.The optimized chemical plugging slurry was well performed in permeable formations.The asphalt hardener (YHJ-5) could increase the softening point of asphalt by 75 ℃.In a practical application, the plugging while drilling technique reduced the total hydrocarbon value of asphalt layers in Well F18 from 87.98% to 23.4%, which effectively prevented asphalt influx effectively;the emulsifying and viscosity reducing technique kept drilling fluid funnel viscosity under 62 s in Well F02;the chemical plugging technique improved formation strength by 0.2 g/cm3 in Well F19;the asphalt hardening technique reduced drilling fluid volume contamination by 19.5% in Well F17;the optimized casing program and MPD drilling technique assured safe drilling through asphalt layers of 158 m in Well S03.Therefore, the new contamination control technique could solve the problems encountered when drilling in ultra-thick asphalt layers in Y Oilfield.
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Keywords:
- asphalt /
- plugging /
- manage pressure drilling /
- casing program /
- asphalt hardener /
- Y Oilfield
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