本文關鍵詞：多裂縫應力干擾研究　出處：《西南石油大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 應力干擾 間距優(yōu)化 多裂縫 雙水平井

【摘要】：近年來,在水平井分段壓裂、同步壓裂等新技術的推動下,中國非常規(guī)頁巖氣開采不斷地取得新突破。頁巖儲層的開發(fā)都采用了水平井分段壓裂技術,水平井各段裂縫之間的應力干擾作用使原場應力改變是裂縫網絡形成的基礎。研究裂縫寬度方向、裂縫長度方向的應力干擾以及停泵時間、排量等參數對應力干擾的影響對確定合理的水平井裂縫參數、解釋縫網成因有一定理論指導意義。本文對多裂縫應力干擾進行了一定的研究,主要內容包括： (1)以均質、各向同性的二維平面應變模型為基礎,依據變形后的人工裂縫誘導應力計算模型,結合復變函數理論和彈塑性力學知識計算了裂縫周圍誘導應力差值的分布特征,并把誘導應力場中水平最大、最小主應力方向發(fā)生反轉作為判斷依據,得到了應力干擾條件下水平井分段壓裂最優(yōu)段間距優(yōu)化方法。 (2)將復變函數理論與位錯理論相結合,以雙水平井多裂縫為研究對象,建立了無限大介質中裂縫尖端應力強度因子計算的數學模型。分析了不同裂縫長度比值、裂縫間距、裂縫交疊長度對縫尖應力強度因子的影響。 (3)推導建立了帶時間、無因次距離的應力干擾量數學模型,分析了停泵時間、排量、濾失系數等參數對無因次應力干擾量的影響,并且分析了這些參數與不同壓裂方式的關系。 (4)推導建立了內外裂縫剛度系數計算模型,計算了不同裂縫條數條件下剛度系數、裂縫寬度比值隨無因次距離的變化,并分析了這些變化與彈性模量和縫寬的關系。 本文主要從上述四個方面對應力干擾進行了機理研究,取得了一些更深的認識。
[Abstract]:In recent years, in the horizontal well fracturing, new technology driven synchronous fracturing under Chinese unconventional shale gas continue to achieve new breakthroughs. The development of shale reservoir with horizontal well fracturing technology, horizontal well sections between the crack stress disturbance makes the original stress field change is the basis of fracture network study on crack formation. The width direction, interference stress crack length and the pump stop time, horizontal well fracture parameters to determine the reasonable influence of displacement parameters such as stress interference, explain the causes of fracture network has a certain theoretical significance. In this paper many cracks stress interference was studied, the main contents include:
(1) in a homogeneous, isotropic two-dimensional plane strain model based on artificial fracture after deformation induced by stress calculation model, combined with complex knowledge to calculate the distribution of stress difference induced by cracks around the mechanics of plastic function theory and elastic, and the induced stress field in the level of maximum and minimum principal stress the direction of the force is reversed as the basis of judgment, the stress interference conditions of horizontal well fracturing optimal segment spacing optimization method.
(2) the complex function theory and the theory of dislocation combined with multiple cracks in double horizontal wells as the research object, the establishment of the crack tip in an infinite medium should be a mathematical model to calculate the stress intensity factor. Analysis of different crack length ratio, crack spacing, crack overlap length on tip stress intensity factor.
(3) a mathematical model of stress interference with time and dimensionless distance is derived. The influence of pump stopping time, displacement and filtration coefficient on dimensionless stress interference is analyzed, and the relationship between these parameters and different fracturing modes is analyzed.
(4) the stiffness coefficient calculation model of internal and external cracks is derived and calculated. The stiffness coefficient and the ratio of crack width ratio with dimensionless distance are calculated under different crack numbers, and the relationship between these changes and elastic modulus and slit width is also analyzed.
This paper mainly studies the mechanism of force interference from the above four aspects, and has obtained some deeper understanding.

【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE357.1

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