JP7360390B2 - 多孔質媒体の流体流特性の特定 - Google Patents
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Description
本出願は、参照により本明細書に援用される、2018年1月10日に出願された「Digital Rock Procedures for Determining Wettability」と題する米国仮特許出願第62/615,701号の利益を主張する。
(1)毛細管圧(PC)、すなわち、非濡れ性流体(油)および濡れ性流体(水)の圧力差。これは、境界条件、例えば油の入口圧力-水の出口圧力(Pinlet oil-Pout water)から直接得ることができるが、他の試験方法も、油および水の分布をもたらし、結果として、毛細管圧が得られる場合があり、これは例えば相対浸透率試験である。
(2)曲率ベースの圧力(PV)、すなわち、油/水の界面の形状を強制的に幾何学の形状(すなわち、岩石表面/孔の形状等)にする固体幾何学によって生じる圧力。曲率は、上述したVTK(視覚化ツールキット)等の様々なソフトウェアライブラリにおいて一般的に利用可能な幾何学アルゴリズムを用いて計算される。
(3)分離圧(PD)、すなわち、膜が破裂することを阻止する圧力。すなわち、膜に加わる圧力が最大分離圧を超えるとき、膜は破裂する。
(PP>PV+PD)、すなわち、毛細管圧が曲率ベースの圧力と分離圧とを加えたものよりも大きい、または
(PP-PV>PD)、すなわち、毛細管圧から曲率ベースの圧力を減算したものが分離圧よりも大きい。
図4を参照すると、検証プロセス80が示されている。検証プロセスは、実験的に特定されたWeであるアモットインデックスおよびUSBM法(アメリカ合衆国鉱山局)インデックス等の濡れ性インデックスの形態の岩石試料の濡れ性の尺度の使用82により、図2の濡れ性計算の検証を提供する。これらの値は、図2の数値的エイジングプロセス40から結果として得られる予測濡れ性分布を検証および/または較正するのに用いられる。アモット試験は、2つの自然吸収測定値および2つの強制変位測定値を組み合わせる石油工学における貯留層コアのための既知の経験的濡れ性測定であり、コア解析実験から得られた2つの異なるインデックス、すなわちアモット水インデックスおよびアモット油インデックスを定義する。
Claims (12)
- 少なくとも2つの流体の存在下での物理的岩石試料のエイジングおよび濡れ性変化をシミュレートするためのコンピュータ実施方法であって、
コンピューティングシステムによって、物理的岩石試料の表現を索出することであって、前記表現は、前記物理的岩石試料に対応する、化学組成、孔隙および粒子間隙データを含むことと、
前記コンピューティングシステムによって、前記物理的岩石試料の前記表現の前記孔隙内の表面位置についてエイジングおよび濡れ性変化の反復的なシミュレーションを行うことと、
前記コンピューティングシステムによって、前記濡れ性変化の以前の反復から前記物理的岩石試料の前記表現の前記孔隙内の前記表面位置について局所曲率の変化を計算することと、
前記コンピューティングシステムによって、計算された前記局所曲率の変化に基づいて前記物理的岩石試料の前記表現に対応する前記表面位置の変更された表面濡れ性を特定することと、
前記コンピューティングシステムによって、前記物理的岩石試料のエイジングの実験的値に関してエイジングの度合いを検証し、前記エイジングが検証されると前記反復的なシミュレーションを終了させることと、
を含む、方法。 - 前記少なくとも2つの流体は水および油を含み、前記コンピューティングシステムによって局所曲率の前記変化を計算することは、
前記コンピューティングシステムによって、前記孔隙内の前記表面位置の局所毛細管圧および局所分離圧を計算することを含み、
前記方法は、
前記計算された局所曲率の変化から、水-油膜破損が生じるか否かを特定することと、
前記表面位置のうちのいくつかについて、前記局所毛細管圧を局所曲率に基づく圧力および局所分離圧の和と比較することによって、水-油膜破損が生じるか否かを特定することと、
水-油膜破損を有する前記表面位置のうちの少なくともいくつかについて、局所表面特性、局所流体化学組成、およびエイジングに基づいて、濡れ性変化の度合いを特定することと、
を更に含む、請求項1に記載の方法。 - 濡れ性シミュレーションに必要な入力パラメータをコンピュータシミュレーション環境に割り当てることを更に含み、
前記物理的岩石試料の前記表現は、三角メッシュとしてモデル化され、流体は、割り当てられた属性を有するボクセルによって表される、請求項1に記載の方法。 - ボクセルは、前記流体を前記三角メッシュに適合させるように切断される、請求項3に記載の方法。
- ユーザが指定した条件に従って流体相分布を確立する排出シミュレーションを実行することを更に含み、
前記ユーザが指定した条件は、実験室および貯留層条件を表すものからなる群から選択され、
排出シミュレーションを実行することは、
流体計算技法を用いて排出をシミュレートし、前記物理的岩石試料の前記表現を通じた、ユーザが指定した条件についての流体相分布を確立することを更に含む、
請求項1に記載の方法。 - 排出シミュレーションを実行することは、
前記物理的岩石試料の前記表現における各表面で局所曲率の前記変化を計算することと、
前記局所曲率の前記変化の前記計算の結果を適用して、各表面位置における局所毛細管圧を計算することと、
を更に含む、請求項5に記載の方法。 - 濡れ性変化の数値表現の特定の反復を実行した後、前記方法は、
変更された前記表面濡れ性に起因して前記少なくとも2つの流体が再分布することを可能にすること、
を更に含む、請求項1に記載の方法。 - 前記方法は、表面濡れ性変化の数値予測および結果として得られる濡れ性の空間分布を、各表面位置において計算される接触角の形態で提供する、請求項1に記載の方法。
- 離散表面要素および1つまたは複数の流体要素は連通し、鉱物型、流体特性、流体組成、毛細管圧および分離圧の局所特性に依拠する局所濡れ性特定が行われ、濡れ性変化は、反復的に実行され、その後、流体相再分布が続き、前記濡れ性変化は、前記コンピューティングシステムが、後続の繰り返しが特定された局所曲率の値を大幅に変更しないことにより判定される収束を検出するまで繰り返される、請求項1に記載の方法。
- コンピュータシステムであって、
1つまたは複数のプロセッサデバイスと、
前記1つまたは複数のプロセッサデバイスに結合されたメモリと、
少なくとも油および水の2つの流体の存在下での物理的岩石試料のエイジングおよび濡れ性変化をシミュレートするための実行可能コンピュータ命令を記憶するストレージであって、前記命令は、
物理的岩石試料の表現を索出し、前記表現は、前記物理的岩石試料に対応する、化学組成、孔隙および粒子間隙データを含み、
前記物理的岩石試料の前記表現の前記孔隙内の表面位置についてエイジングおよび濡れ性変化の反復的なシミュレーションを行ない、
前記濡れ性変化の以前の反復から前記物理的岩石試料の前記表現の前記孔隙内の前記表面位置について局所曲率の変化を計算し、
計算された前記局所曲率の変化に基づいて前記物理的岩石試料の前記表現に対応する前記表面位置の変更された濡れ性を特定し、
前記物理的岩石試料のエイジングの実験的値に関してエイジングの度合いを検証し、前記エイジングが検証されると前記反復的なシミュレーションを終了させる、
ように前記1つまたは複数のプロセッサを構成する、コンピュータシステム。 - 少なくとも2つの流体の存在下での物理的岩石試料のエイジングおよび濡れ性変化をシミュレートするための実行可能コンピュータ命令を記憶するコンピュータ可読非一時的ストレージデバイス上に有形に記憶されたコンピュータプログラム製品であって、前記命令は、コンピューティングシステムが、
物理的岩石試料の表現を索出し、前記表現は、前記物理的岩石試料に対応する、化学組成、孔隙および粒子間隙データを含み、
前記物理的岩石試料の前記表現の前記孔隙内の表面位置についてエイジングおよび濡れ性変化の反復的なシミュレーションを行ない、
前記濡れ性変化の以前の反復から前記物理的岩石試料の前記表現の前記孔隙内の前記表面位置について局所曲率の変化を計算し、
計算された前記局所曲率の変化に基づいて前記物理的岩石試料の前記表現に対応する前記表面位置の変更された濡れ性を特定し、
前記物理的岩石試料のエイジングの実験的値に関してエイジングの度合いを検証し、前記エイジングが検証されると前記反復的なシミュレーションを終了させる、
ようにさせるためのものである、コンピュータプログラム製品。 - 濡れ性変化は、反復的に実行され、その後、流体相再分布が続き、前記濡れ性変化は、前記コンピューティングシステムが、後続の繰り返しが特定された接触角の値を大幅に変更しないことにより判定される収束を検出するまで繰り返される、請求項1に記載の方法。
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US201862615701P | 2018-01-10 | 2018-01-10 | |
US62/615,701 | 2018-01-10 | ||
PCT/US2019/013079 WO2019140108A1 (en) | 2018-01-10 | 2019-01-10 | Determining fluid flow characteristics of porous mediums |
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JPWO2019140108A5 JPWO2019140108A5 (ja) | 2022-01-18 |
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