石油钻采工艺
石油鑽採工藝
석유찬채공예
OIL DRILLING & PRODUCTION TECHNOLOGY
2015年
1期
72-75
,共4页
罗洪斌%田波%蒋世全%彭作如
囉洪斌%田波%蔣世全%彭作如
라홍빈%전파%장세전%팽작여
深水钻井%当量循环密度%预测模型%海底增压
深水鑽井%噹量循環密度%預測模型%海底增壓
심수찬정%당량순배밀도%예측모형%해저증압
deepwater drilling%equivalent circulating density%prediction model%subsea pressurization
针对深水井筒ECD预测与控制方面存在的不足,建立了考虑温度和岩屑影响及有海底增压管线举升系统情况下的深水钻井ECD预测模型,以实例计算分析了深水钻井中有海底增压管线举升系统情况下ECD变化。结果分析表明,钻柱内的排量一定时,增注排量越大,ECD值越小;在有海底增压管线举升系统时,本计算条件下ECD值均未超过漏失压力,因此该种参数工况下应该为安全状况;在无海底增压时,随着排量的降低,环空ECD逐渐增加,且ECD增加值较大;当排量小于一定值时,ECD的增加会导致在钻井过程中的地层漏失。因此在深水钻井过程中应该特别注意在隔水管段的井眼清洁问题,除了控制机械钻速、泵入清扫液等措施以外,还应适量采取增加排量来及时清除钻屑,保持井眼清洁。最后对比分析了模型的有效性,在本计算条件下与PWD实测值偏差最大1.36%,对深水钻井水力参数优化设计及井控具有一定的参考意义。
針對深水井筒ECD預測與控製方麵存在的不足,建立瞭攷慮溫度和巖屑影響及有海底增壓管線舉升繫統情況下的深水鑽井ECD預測模型,以實例計算分析瞭深水鑽井中有海底增壓管線舉升繫統情況下ECD變化。結果分析錶明,鑽柱內的排量一定時,增註排量越大,ECD值越小;在有海底增壓管線舉升繫統時,本計算條件下ECD值均未超過漏失壓力,因此該種參數工況下應該為安全狀況;在無海底增壓時,隨著排量的降低,環空ECD逐漸增加,且ECD增加值較大;噹排量小于一定值時,ECD的增加會導緻在鑽井過程中的地層漏失。因此在深水鑽井過程中應該特彆註意在隔水管段的井眼清潔問題,除瞭控製機械鑽速、泵入清掃液等措施以外,還應適量採取增加排量來及時清除鑽屑,保持井眼清潔。最後對比分析瞭模型的有效性,在本計算條件下與PWD實測值偏差最大1.36%,對深水鑽井水力參數優化設計及井控具有一定的參攷意義。
침대심수정통ECD예측여공제방면존재적불족,건립료고필온도화암설영향급유해저증압관선거승계통정황하적심수찬정ECD예측모형,이실례계산분석료심수찬정중유해저증압관선거승계통정황하ECD변화。결과분석표명,찬주내적배량일정시,증주배량월대,ECD치월소;재유해저증압관선거승계통시,본계산조건하ECD치균미초과루실압력,인차해충삼수공황하응해위안전상황;재무해저증압시,수착배량적강저,배공ECD축점증가,차ECD증가치교대;당배량소우일정치시,ECD적증가회도치재찬정과정중적지층루실。인차재심수찬정과정중응해특별주의재격수관단적정안청길문제,제료공제궤계찬속、빙입청소액등조시이외,환응괄량채취증가배량래급시청제찬설,보지정안청길。최후대비분석료모형적유효성,재본계산조건하여PWD실측치편차최대1.36%,대심수찬정수력삼수우화설계급정공구유일정적삼고의의。
Considering the shortcomings in ECD prediction and control of deepwater wellhole presently, the ECD prediction model of deepwater drilling has been established, with the temperature and rock debris effects are considered and the lift system of subsea pressurization pipeline is provided. The ECD changes are calculated and analyzed based on the living examples, when the lift system of subsea pressurization pipeline is provided in the deepwater drilling. According to the results, when the displacement in the drilling string is constant, the larger the augmented injection displacement, the smaller the ECD value; when the lift system of subsea pressurization pipeline is provided, the ECD value under such calculation conditions does not exceed the loss pressure, so it should be safe under such parameter conditions; when no subsea pressurization exists, as the displacement decreases, the annular ECD gradually increases, and the ECD added value is relatively greater; when the displacement is less than a constant value, the ECD increase will lead to the stratum loss during the drilling. Therefore, during the deepwater drilling, special attention should be paid to the borehole cleaning at the riser section. In addition to the control over mechanical drilling rate, pumping of cleaning lfuid and other measures, the displacement should be appropriately increased to clear the drilling cuttings in time, which is in order to keep the borehole clean. Finally, the model validity has been compared and analyzed. Under such calculation conditions, the maximum deviation from actually-measured value of PWD is 1.36%. This method has certain reference signiifcances for the optimization design of hydraulic parameter on deepwater drilling and well control.