JP2020041398A - 地熱井における熱プロファイル制御およびエネルギー回収の方法 - Google Patents
地熱井における熱プロファイル制御およびエネルギー回収の方法 Download PDFInfo
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Abstract
Description
前記地層の岩石体積内の地熱勾配を決定するステップと、
最大の熱回収のために決定された地熱勾配に基づく坑井の構成を有する前記岩石体積内の位置および配置の坑井の構成を形成するステップであって、坑井の構成が、入口坑井および出口坑井、並びに流体連通しているラテラル相互接続部を有する閉ループを含み、前記構成の前記ラテラル部が前記岩石体積内に配置される、ステップと、
坑井の構成、
地熱勾配の変化、および
地層地質
に基づいて、前記構成内を所定の順序で循環する少なくとも1つの作動流体を選択するステップと、
前記坑井の構成内の順序付けられた循環から作動流体の温度を決定するステップと、
前記構成内での作動流体のルート変更および分配、
作動流体の組成、
前記構成内の作動流体の流量、
作動流体の流れ方向、および
前記岩石体積からの前記作動流体によるエネルギー回収を最大化するためのそれらの組み合わせ
の少なくとも1つを選択するステップと、
を含む。
14 地熱地層
16 デッドスポット
18 水平坑井システム
20、22、24、26、28、30、32 水平坑井
34 入口坑井
36 出口坑井
38、40、42、44、46、48、50 水平坑井
52 入口坑井
54 出口坑井
56、58、60、66、68、70 坑井
62、72 入口坑井
64、74 出口坑井
80、82、84、86、88、90、92 坑井
94、96、98、104、106、108 坑井
100、110 入口坑井
102、112 出口坑井
114、116 流体連結
118、120、122 坑井
124、126、128 坑井
Claims (23)
- 地熱勾配を有する地層内で地熱エネルギーの回収を最大化する方法であって、
前記地層の岩石体積内の地熱勾配を決定するステップと、
最大の熱回収のために決定された地熱勾配に基づく坑井の構成を有する前記岩石体積内の位置および配置の坑井の構成を形成するステップであって、前記坑井の構成が、入口坑井および出坑井並びに流体連通しているラテラル相互接続部を有する閉ループを含み、前記構成の前記ラテラル部が前記岩石体積内に配置される、ステップと、
坑井の構成、
地熱勾配の変化、および
地層地質
に基づいて、前記構成内を所定の順序で循環する少なくとも1つの作動流体を選択するステップと、
前記坑井の構成内の順序付けられた循環から作動流体の温度を決定するステップと、
前記構成内での作動流体のルート変更および分配、
作動流体の組成、
前記構成内の作動流体の流量、
作動流体の流れる方向、および
前記岩石体積からの前記作動流体によるエネルギー回収を最大にするためのそれらの組み合わせ
の少なくとも1つを選択するステップと、
を含む、方法。 - 前記坑井の構成が、坑井のラテラル部におけるケーシングのない掘削中に坑井をシールすることにより形成される、請求項1に記載の方法。
- 前記勾配の決定が、前記岩石体積内の温度分布を決定するステップを含む、請求項1に記載の方法。
- 前記岩石体積内の岩石の種類および熱伝導率を特徴付けるステップをさらに含む、請求項1に記載の方法。
- 作動流体の組成の選択が、前記構成における坑井の完全性および前記坑井の構成の圧縮強度のための流体密度を維持するための添加剤を組み込むことを含む、請求項1に記載の方法。
- 作動流体温度、前記構成における坑井の完全性、および作動中の前記構成における坑井の熱リチャージのうちの少なくとも1つを制御するステップをさらに含む、請求項1に記載の方法。
- 坑井の完全性を維持するために、補助的な機械的または化学的ユニット操作およびそれらの組み合わせを任意選択的に導入するステップをさらに含む、請求項1に記載の方法。
- 前記補助的な機械的操作が、所定の位置で前記坑井の構成にケーシングおよびマルチラテラル接合部を導入することを含む、請求項7に記載の方法。
- 前記補助的な化学的操作が、化学シーラント、高密度化剤、および架橋剤のうちの少なくとも1つを、単一操作および逐次段階操作の少なくとも1つにおいて所定の位置で前記坑井の構成に導入することを含む、請求項7に記載の方法。
- エネルギー抽出を最大化するために、前記岩石体積内の前記構成における個々の坑井の間隔形成、角度付け、積層、集塊化、相互嵌合および相互接続、ならびにそれらの組み合わせの少なくとも1つをさらに含む、請求項1に記載の方法。
- 1つまたは複数の地上の位置で前記構成における所定の位置の入口坑井と出口坑井を選択的に接続するステップをさらに含む、請求項10に記載の方法。
- 坑井の構成を形成するステップが、地上の位置で坑井に接続された共通の入口坑井および共通の出口坑井を任意選択的に有する坑井のネットワークを前記地層の前記岩石体積内に形成することを含む、請求項1に記載の方法。
- 順序付けられた循環が、流量変化、流れ方向、静止、およびそれらの組み合わせを含む、請求項1に記載の方法。
- 前記坑井の構成内の所定の位置で前記作動流体をサンプリングして、循環されていない作動流体に対する組成の変化を決定するステップをさらに含む、請求項1に記載の方法。
- 前記組成の変化が化学的または機械的な坑井の要因に関連するか否かを決定するステップをさらに含む、請求項14に記載の方法。
- 高温勾配、低温勾配、前記勾配内の伝導ゾーン、前記勾配内の対流ゾーン、前記地層内の高透水性ゾーン、前記地層内の低透水性ゾーンおよびそれらの組み合わせのうちの少なくとも1つの中に前記構成を形成するステップをさらに含む、請求項1に記載の方法。
- 前記構成における近接する坑井間の熱プロファイルの変動を制御するステップをさらに含み、前記制御するステップは、
前記岩石体積内の温度分布に基づいて、前記岩石体積内の前記坑井の構成を選択するステップと、
前記構成の坑井の間隔を空けて、近接する坑井間の熱干渉および非効率的な熱回収を低減するステップと、
を含む、請求項1に記載の方法。 - 前記坑井の第1の坑井に第1の作動流体を導入して、前記坑井を通して最大から最小までの前記勾配において周囲の地層岩から熱エネルギーを吸収するステップと、
前記坑井の第2の坑井に第2の作動流体を導入して、前記坑井を通して最大から最小まで前記地層の周囲の地層岩から熱エネルギーを吸収するステップであって、熱の極小値と極大値がない前記坑井に近接する岩石体積内の熱的一貫性を誘導するために、第1流体の流れが前記第2の流体の流れと逆方向である、ステップと、
を任意選択的に含む、請求項17に記載の方法。 - 回収された熱エネルギーを利用するために地表の装置を前記ループと統合するステップをさらに含む、請求項1に記載の方法。
- 前記地表の装置が、工業的工程において使用するための蒸気発生装置、発電装置、電力貯蔵装置、リンクされた坑井の構成へのエネルギーの選択的分配のための分配ネットワーク、およびそれらの組み合わせのうちの少なくとも1つを含む、請求項19に記載の方法。
- 最適な油圧性能を維持しながら拡張された坑井ネットワーク構成を可能にするために、抗力低減剤を前記作動流体に導入するステップをさらに含む、請求項1に記載の方法。
- 前記構成内のラテラル部内の流れ分配を受動的に制御するために、各ラテラルに十分な油圧摩擦圧力損失を提供するステップをさらに含む、請求項1に記載の方法。
- 前記岩石体積内での前記坑井の配置および位置のために熱伝導率と掘進率との間の相互作用を決定するステップをさらに含む、請求項1に記載の方法。
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CA3044153C (en) | 2018-07-04 | 2020-09-15 | Eavor Technologies Inc. | Method for forming high efficiency geothermal wellbores |
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