CN1488031A - 确定贮烃流体的pvt性质 - Google Patents
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Abstract
确定贮烃流体原位PVT性质的方法,其中所述贮烃流体存在于被钻孔贯穿的载烃地层中,所述方法包括以下步骤:a)计算沿着载烃地层的压力梯度;以及b)利用经验关联由压力梯度确定原位PVT性质,而所述关联是作为压力梯度的函数拟合曲线(11)得到的,所述曲线(11)通过以前所得到的数据点(12、13、14),这些数据点包括测量的PVT性质。
Description
本发明涉及确定贮烃流体的PVT性质,其中PVT为首字母的缩写,指压力、体积和温度。PVT性质是气-油比、API重度、粘度、饱和压力、地层体积因子、分子量、密度及油压缩系数。
为了测量贮烃流体的PVT性质,在贮存压力和温度下对贮烃流体取样并进行分析。在书藉《石油地质工程文集》(Contributions inPetroleum Geology and Engineering)的第五卷,第三节:油和天然气的性质(Properties of Oils and Natural Gases)K.S.Pederson等,1989中给出了进行PVT分析的方法的简要描述。这种分析可以非常准确,但需要很长的时间来完成。
尽快知道贮烃流体的PVT性质是非常重要的,优选的是当油井钻好后即刻得知。因为这以后仍有可能考虑实际PVT性质而调节生产和地面设备的设计。
申请人已经发现在贮油的PVT性质和压力梯度(dp/dz)之间存在经验关联,其中p为贮油中的流体压力,z为实际的垂直深度。由于压力梯度可以在钻井完成后直接确定,因此可能尽早得到PVT性质。
因此,按照本发明,提供了一种确定贮烃流体原位PVT性质中至少一项的方法,所述贮烃流体存在于被钻孔贯穿的载烃地层(formationlayer)中,所述方法包括以下步骤:
a)计算沿着载烃地层的压力梯度;以及
b)利用经验关联由压力梯度确定原位PVT性质,而所述关联是作为压力梯度的函数拟合通过以前所得到的数据点的曲线得到的,这些数据点包括测量的PVT性质。
下面将参照附图通过实施例更详细地描述本方法,其中,
图1给出了y-轴上以标准立方英尺/标准桶为单位的气-油比作为x-轴上以磅/平方英寸/英尺为单位的压力梯度(在原位压力和温度下)的函数;
图2给出了y-轴上以°API为单位的API重度作为x-轴上以磅/平方英寸/英尺为单位的压力梯度(在原位压力和温度下)的函数;
图3给出了y-轴上以厘泊为单位的粘度(在原位压力和温度下)作为x-轴上以磅/平方英寸/英尺为单位的压力梯度(在原位压力和温度下)的函数;
图4给出了y-轴上以磅/平方英寸为单位的饱和压力绝对值作为x-轴上以磅/平方英寸/英尺为单位的压力梯度(在原位压力和温度下)的函数;
图5给出了y-轴上的地层体积因子、油作为x-轴上以磅/平方英寸/英尺为单位的压力梯度(在原位压力和温度下)的函数;以及
图6给出了y-轴上的分子量作为x-轴上以磅/平方英寸/英尺为单位的压力梯度(在原位压力和温度下)的函数。
参照附图,我们以相反的顺序讨论本发明确定原位PVT性质中至少一项的方法,其中我们最开始讨论经验关联是如何得到的。
图1-6所示的曲线给出了拟合数据点i2、i3和i4得到的经验关联即线i1,其中i为图的编号(i=1-6),这些数据点由同一地理区域的贮油中取样得到。为了更清楚,并不是所有的数据点都标上了参考标记。
数据点按如下过程得到。首先对含有贮烃流体的地层钻井。然后利用测井电缆将一个工具降低到该地层中一组位置中的第一个。所述工具包括一个中心管道和一个流体接收器,所述中心管道具有入口并配有压力探头,所述流体接收器具有对着中心管道打开的入口。在该位置将一个带有出口的探针延伸进入地层中,所述探针的出口与中心管道的入口直接流体连通,从而使地层和中心管道入口之间形成专门的流体连通。然后使地层流体进入流体接收器,并测量压力积累值。所需要的流体压力是针对该位置压力积累结束时的压力。
然后将所述工具移动到下一个位置,再次测量流体压力积累,从而得到所述位置的流体压力,如此重复直到所有位置的全部流体压力均已确定为止。利用这些确定压力梯度。
然后对贮烃流体采样,在实验室内在贮烃条件下测量样品的PVT性质。这些测量值给出图1-6中的数据点。
为了得到所有的数据点,在同一地理区域针对多个井收集并分析这些数据。
然后针对各项PVT性质通过这些数据拟合曲线,令人惊奇地,这些数据拟合得相当精确,吻合度R2大于0.9,其中
其中n为数据点的个数,(x1,...,xn)为一组压力梯度,x为平均压力梯度,(y1,...,yn)为一组PVT性质的测量值,y为平均PVT性质。R2为相关系数的平方。
下表给出了曲线拟合的结果。
| PVT性质 | 曲线 | R2 |
| 气油比 | (8.6)(dp/dz)-4.2 | 0.98 |
| API重度 | 65-(117)(dp/dz) | 0.91 |
| 粘度 | (0.0005)exp(24dp/dz) | 0.96 |
| 饱和压力 | (16980)exp(-3.6dp/dz) | 0.72 |
| 地层体积因子 | (0.10)(dp/dz)-2.3 | 0.97 |
| 分子量 | (5.2)exp(8.9dp/dz) | 0.98 |
对于其它PVT性质如密度和油压缩系数,也可以得到关联。
下面我们将讨论如何原位确定未知贮烃流体的PVT性质,所述贮烃流体存在于被钻孔贯穿的载烃地层中。适当地,所述载烃地层处于同一地理区域。
首先将一个工具降低到该地层中一组位置中的第一个。所述工具包括一个中心管道和一个流体接收器,所述中心管道具有入口并配有压力探头,所述流体接收器具有一个对着中心管道打开的入口。在该位置将一个带有出口的探针延伸进入地层中,所述探针的出口与中心管道的入口直接流体连通,从而使地层和中心管道入口之间形成专门的流体连通。然后使地层流体进入流体接收器,并测量压力积累值。所需要的流体压力是针对该位置压力积累结束时的压力。
然后将所述工具移动到下一个位置,再次测量压力积累,从而得到所述位置的流体压力,如此重复直到所有位置的全部流体压力均已确定为止。利用这些计算压力梯度。
然后利用压力梯度通过经验关联得到所需要的PVT性质。
这表明利用本发明的方法可以达到好的精度。
当贮烃流体为所谓的重油即相当粘时,获得贮烃流体的代表性样品将会很难。为了获得具有代表性的样品,形成专门的流体连通的步骤进一步包括启动设置在探针附近的加热设备以加热地层流体。
适当地,将探针与一个组件中的封隔器(packer)垫相连,并且加热设备就设置在该封隔器垫中。另外可将加热设备设置在所述工具上。所述加热设备可以是产生微波、光波或红外波的设备。所述加热设备也可以是电加热器、化学加热器或核加热器。
尽管已经参照一个开孔讨论了本发明,但本发明也可以用于加套孔。在这种情况下,计算沿着载烃地层的压力梯度从形成多组孔开始,这些孔穿过套管壁进入地层中。然后在加套钻孔中将所述工具降低到第一组孔处。所述工具进一步配有在中心管道入口的任一侧设置的上部和下部封隔器,其中上部和下部封隔器之间的距离大于孔组的高度,并且其中相邻孔组之间的间隔至少等于最长封隔器的长度。设置封隔器从而使孔组跨在封隔器之间。然后使地层流体进入流体接收器,测量压力累积值,并确定流体压力。然后在下一组孔附近设置所述工具,并测量流体压力,如此重复直到预先确定的位置个数的流体压力均已测量为止。由这些流体压力及套管组实际的垂直深度计算压力梯度。
Claims (5)
1.一种确定贮烃流体原位PVT性质中至少一项的方法,所述贮烃流体存在于被钻孔贯穿的载烃地层中,所述方法包括以下步骤:
a)计算沿着载烃地层的压力梯度;以及
b)利用经验关联由压力梯度确定原位PVT性质,而所述关联是作为压力梯度的函数拟合通过以前所得到的数据点的曲线得到的,这些数据点包括测量的PVT性质。
2.权利要求1的方法,其中按步骤a)计算沿着载烃地层的压力梯度的步骤包括如下步骤:
a1)将一个工具降低到地层中一组位置中的第一个,所述工具包括一个中心管道和一个流体接收器,所述中心管道具有入口并配有压力探头,所述流体接收器具有一个对着中心管道打开的入口;
a2)在地层和中心管道入口之间形成专门的流体连通;
a3)使地层流体进入流体接收器,并测量压力积累值,直到所测得的压力不再变化为止,从而得到流体压力;
a4)将所述工具移动到下一个位置,并测量所述位置的流体压力,如此重复直到所有位置的全部流体压力均已测量为止;以及
a5)计算压力梯度。
3.权利要求2的方法,其中在地层和中心管道入口之间形成专门的流体连通包括将一个探针延伸入地层中,所述探针的出口与所述工具的中心管道的入口直接流体连通。
4.权利要求3的方法,其中形成专门的流体连通进一步包括启动设置在探针附近的加热设备以加热地层流体。
5.权利要求2的方法,其中所述钻孔是加套的,并且其中按步骤a)计算沿着载烃地层的压力梯度的步骤包括如下步骤:
a1)形成穿透套管壁进入地层中的多组孔;
a2)在加套钻孔中将所述工具降低至第一组孔处,所述工具进一步配有在中心管道入口的任一侧设置的上部和下部封隔器,其中在上部和下部封隔器之间的距离大于孔组的高度,并且其中相邻孔组之间的间隔至少等于最长的封隔器的长度;
a3)设置封隔器从而使孔组跨在封隔器之间,使地层流体进入流体接收器,测量压力累积值,并确定流体压力;
a4)在下一组孔附近设置所述工具,重复步骤a3)直到预先确定的位置个数的流体压力均已测量为止;以及
a5)计算压力梯度。
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| US6393906B1 (en) * | 2001-01-31 | 2002-05-28 | Exxonmobil Upstream Research Company | Method to evaluate the hydrocarbon potential of sedimentary basins from fluid inclusions |
| WO2003016826A2 (en) * | 2001-08-17 | 2003-02-27 | Baker Hughes Incorporated | In-situ heavy-oil reservoir evaluation with artificial temperature elevation |
| US7249009B2 (en) * | 2002-03-19 | 2007-07-24 | Baker Geomark Llc | Method and apparatus for simulating PVT parameters |
-
2002
- 2002-01-16 MY MYPI20020157A patent/MY127805A/en unknown
- 2002-01-17 AU AU2002225027A patent/AU2002225027B2/en not_active Ceased
- 2002-01-17 WO PCT/EP2002/000517 patent/WO2002057596A1/en not_active Ceased
- 2002-01-17 EA EA200300799A patent/EA004669B1/ru not_active IP Right Cessation
- 2002-01-17 BR BR0206483-9A patent/BR0206483A/pt active Search and Examination
- 2002-01-17 CA CA2434657A patent/CA2434657C/en not_active Expired - Fee Related
- 2002-01-17 CN CNB028038908A patent/CN1283898C/zh not_active Expired - Fee Related
- 2002-01-17 US US10/363,952 patent/US6941804B2/en not_active Expired - Lifetime
- 2002-01-17 EP EP02715456A patent/EP1352154B1/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| NO20033249L (no) | 2003-09-16 |
| MY127805A (en) | 2006-12-29 |
| WO2002057596A1 (en) | 2002-07-25 |
| US20040029739A1 (en) | 2004-02-12 |
| CA2434657C (en) | 2012-02-21 |
| EP1352154A1 (en) | 2003-10-15 |
| NO20033249D0 (no) | 2003-07-17 |
| CA2434657A1 (en) | 2002-07-25 |
| EP1352154B1 (en) | 2004-05-12 |
| EA200300799A1 (ru) | 2003-12-25 |
| AU2002225027B2 (en) | 2006-09-21 |
| BR0206483A (pt) | 2004-02-25 |
| CN1283898C (zh) | 2006-11-08 |
| NO324150B1 (no) | 2007-09-03 |
| EA004669B1 (ru) | 2004-06-24 |
| US6941804B2 (en) | 2005-09-13 |
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