石油钻探技术
石油鑽探技術
석유찬탐기술
PETROLEUM DRILLING TECHNIQUES
2015年
4期
53-58
,共6页
低渗透储集层%近井地带%聚合物%数学模型%模拟评价
低滲透儲集層%近井地帶%聚閤物%數學模型%模擬評價
저삼투저집층%근정지대%취합물%수학모형%모의평개
low permeability reservoir%near wellbore region%polymer damage%mathematical model%simulative evaluation
聚合物作为钻井液常用处理剂在钻井过程中得到了广泛应用，其对储层的伤害也日益被人们关注。为了建立一种快速、准确评价低渗储层钻井过程中聚合物对近井地带伤害的方法，在充分调研国内外聚合物伤害模拟评价技术的基础上，建立了低渗储层近井地带聚合物伤害模型，给出了可用于计算机编程的求解方法，并利用所建立的模型，对钻井过程中影响聚合物伤害的主要因素进行了定性分析。结果表明：聚合物伤害发生在近井地带，随着地层渗透率降低，伤害深度和程度都降低；随着压差增大，聚合物伤害程度增加；聚合物质量浓度增大，可降低工作液的滤失量，减小聚合物的伤害半径；毛管力对聚合物伤害的影响较小；启动压力梯度可降低聚合物伤害，但当其较小时，对聚合物伤害的影响不大。
聚閤物作為鑽井液常用處理劑在鑽井過程中得到瞭廣汎應用，其對儲層的傷害也日益被人們關註。為瞭建立一種快速、準確評價低滲儲層鑽井過程中聚閤物對近井地帶傷害的方法，在充分調研國內外聚閤物傷害模擬評價技術的基礎上，建立瞭低滲儲層近井地帶聚閤物傷害模型，給齣瞭可用于計算機編程的求解方法，併利用所建立的模型，對鑽井過程中影響聚閤物傷害的主要因素進行瞭定性分析。結果錶明：聚閤物傷害髮生在近井地帶，隨著地層滲透率降低，傷害深度和程度都降低；隨著壓差增大，聚閤物傷害程度增加；聚閤物質量濃度增大，可降低工作液的濾失量，減小聚閤物的傷害半徑；毛管力對聚閤物傷害的影響較小；啟動壓力梯度可降低聚閤物傷害，但噹其較小時，對聚閤物傷害的影響不大。
취합물작위찬정액상용처리제재찬정과정중득도료엄범응용，기대저층적상해야일익피인문관주。위료건립일충쾌속、준학평개저삼저층찬정과정중취합물대근정지대상해적방법，재충분조연국내외취합물상해모의평개기술적기출상，건립료저삼저층근정지대취합물상해모형，급출료가용우계산궤편정적구해방법，병이용소건립적모형，대찬정과정중영향취합물상해적주요인소진행료정성분석。결과표명：취합물상해발생재근정지대，수착지층삼투솔강저，상해심도화정도도강저；수착압차증대，취합물상해정도증가；취합물질량농도증대，가강저공작액적려실량，감소취합물적상해반경；모관력대취합물상해적영향교소；계동압력제도가강저취합물상해，단당기교소시，대취합물상해적영향불대。
Polymers are widely used in drilling as a common agent of drilling fluids and their damage to reservoirs is increasingly drawing attention .Based on investigations on the simulation evaluation tech-niques of polymer damage ,a damage model of polymers near w ellbore region of low permeability reservoirs was established for a fast and accurate evaluation method .The method of solving differential equations was also given .This method can be used for computer programming .Main factors influencing polymer damage in drilling were qualitatively analyzed by using the proposed model .The results showed that the polymer damage occurred in the vicinity of a wellbore and damage radius and the degree would decrease with the re-duction of formation permeability .In addition ,the degree of polymer damage would increase as the in-crease of pressure differential .An increase of polymer concentration could reduce the filter loss of drilling fluid and polymer damage radius .It also showed that capillary force had less effect on polymer damage and the starting pressure gradient might reduce polymer damage .But the influence on polymer damage would be much less when starting pressure gradient was quite low .
