CAJ | 학술논문

长庆气田具有典型的低压、低渗、低产特征.气井实施压裂、酸化等储层改造措施后,依靠产出气携持作用和地层能量进行排液很难达到预期效果.排液时间长且不彻底,容易引起储层二次伤害和影响正常试气生产,必须采取有效的排液技术排出积液,以提高气井产量和确保稳产.基于现场试验,提出了几种非常规排液技术的现场应用,分析了各项技术的可行性,同时开展了现场制氮气举排液试验,并评价了其应用效果;试验表明,油管注气憋压排液和套放排液法适于套压较低的气井;油套连通排液适于部分油放不通而套压较高的气井;现场制氮排液相对成本低,效果明显,值得现场进一步推广.通过试验研究,为同类气藏现场排液技术的应用和决策提供了一定的参考.
장경기전구유전형적저압、저삼、저산특정.기정실시압렬、산화등저층개조조시후,의고산출기휴지작용화지층능량진행배액흔난체도예기효과.배액시간장차불철저,용역인기저층이차상해화영향정상시기생산,필수채취유효적배액기술배출적액,이제고기정산량화학보은산.기우현장시험,제출료궤충비상규배액기술적현장응용,분석료각항기술적가행성,동시개전료현장제담기거배액시험,병평개료기응용효과;시험표명,유관주기별압배액화투방배액법괄우투압교저적기정;유투련통배액괄우부분유방불통이투압교고적기정;현장제담배액상대성본저,효과명현,치득현장진일보추엄.통과시험연구,위동류기장현장배액기술적응용화결책제공료일정적삼고.
Changqing gas field has the typical characteristics with the low reservoir pressure, low permeability and low production. Conventional liquid drainage technique can not reach the anticipated effect, which based on the output gas holding effect and the forma-tion energy. Because of the long drainage operation time and the halfway measures which could induce reservoir secondary damage and affect regular gas production test. Therefore, it is necessary to adopt efficient liquid drainage techniques to unload the bottomhole liquid and enhance the stable gas production. This paper has put forward several unconventional liquid drainage techniques in field use, analyzed their practicability, and operated the liquid unloading experiment of field nitrogen gas generation and gas lifting technique. The field experiments indicate that method of tubing gas injection hold pressure for draining and method of casing pressure relief for drain-ing are adapted to the gas well with low casing pressure; method of tubing connected with casing for draining is adapted to the well with higher casing pressure which can not unloading the liquid with tubing draining; method of field nitrogen gas generation for gas lifting has obvious effect with low cost, which is worth popularizing on field. Through the experimental research, it provides certain reference for the field application and decision-making on liquid drainage in the similar gas reservoir.