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Fracture horizontal seam-extra-low permeability oil reservoir bottom water injection simulation device and method

A technology for water injection simulation and horizontal fractures, which is applied in earth-moving drilling, wellbore/well components, and production fluids.

Pending Publication Date: 2020-07-24
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In conventional waterflooding development of fractured horizontal fractures-ultra-low permeability reservoirs, there is often one-way breakthrough of injected water along the heterogeneous high permeability zone or rapid water channeling along the fractures, resulting in small water flooding area, rapid rise of water cut, and rapid recovery of oil wells. Many problems such as water flooding and low formation energy replenishment efficiency
Therefore, in order to solve the problem that the development of conventional water injection in ultra-low permeability reservoirs is unsatisfactory due to the development of fractured horizontal fractures, a new water injection method is proposed-bottom water injection (that is, water injection at the bottom of the oil layer and oil recovery at the top). This water injection method is suitable for oil reservoirs. The formation is ultra-low permeability and conforms to the positive rhythm of sedimentation, the horizontal fractures at the bottom of the oil layer are developed, and the oil layer is thick without interlayers. The main mechanism of this method is to use the vertical difference of injection-production position and the gravitational differentiation of oil and water to efficiently replenish formation energy and inhibit the rise of water cut speed, enhanced waterflood recovery

Method used

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  • Fracture horizontal seam-extra-low permeability oil reservoir bottom water injection simulation device and method
  • Fracture horizontal seam-extra-low permeability oil reservoir bottom water injection simulation device and method
  • Fracture horizontal seam-extra-low permeability oil reservoir bottom water injection simulation device and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A fracturing horizontal fracture-ultra-low permeability reservoir bottom water injection simulation device, comprising a cuboid core 32 and an input end and an output end respectively connected to the cuboid core 32; wherein, the input end is connected to a formation water injection system and a formation oil injection system, The output end includes a produced oil analysis system; it also includes a core holder 35, in which five cuboid cores 32 with different permeability are arranged side by side along the horizontal direction; wherein, the cuboid core 32 at the bottom of the core holder 35 There is a horizontal seam 45 on the top; the input end is connected to the formation water injection system and the formation oil injection system on the one hand, and connected to the left end face of the cuboid core 32 on the other hand; the output end is connected to the right end face of the cuboid core 32 at the top of the core holder 35 The inner surface of the core holder 35...

Embodiment 2

[0045] On the basis of Embodiment 1, it also includes: the inlet end of the core holder 35 is provided with a diversion pad 31, and the diversion pad 31 includes 5 diversion units vertically arranged, respectively connected to 5 cuboids Corresponding to the rock core 32; each diversion unit is composed of a diversion channel 50 and a diversion hole 51, and the diversion channel 50 is provided with a through diversion hole 51 along the water inlet direction, and the liquid outlet of the diversion channel 50 A cross-shaped support is provided on the end, and a baffle plate corresponding to the position of the diversion hole 51 is provided on the support. The formation water input from the input end first enters the diversion hole 51, and then uniformly injects the formation water into the end face of the cuboid core 32 through the diversion channel 50, so as to improve the saturated formation water and water displacement oil efficiency. The core holder 35 is located in the therm...

Embodiment 3

[0053] Embodiment 3--positive rhythm

[0054] On the basis of Example 2, a method for simulating water injection at the bottom of a fractured horizontal fracture-ultra-low permeability reservoir is proposed, the method is as follows:

[0055] Step 1: The size of the core holder 35 is 50cm*10cm*30cm, and it is placed in the constant temperature box 34 .

[0056] Such as figure 1 As shown: in the initial state, according to the order of permeability from large to small, five cuboid cores 32 are sequentially loaded into the core holder 35 (permeability K1<K2<K3<K4<K5); The cuboid core 32K5 with the highest permeability at the bottom of device 35 is provided with horizontal fractures 45; each cuboid core 32 has a size of 40cm*6cm*5cm, and is combined to form a sedimentary positive rhythm vertical-flat plate ultra-low permeability reservoir model with horizontal fractures 45 ;Connect the pipeline and check the airtightness;

[0057] Step 2: Open the confining pressure tracking p...

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Abstract

The invention relates to a fracture horizontal seam-extra-low permeability oil reservoir bottom water injection simulation device and method. The device comprises cuboid cores, an input end and an output end, the input end and the output end are connected with the cuboid cores, a core holder is further included, five cuboid cores with unequal permeability are mounted in the core holder in the horizontal direction, a horizontal seam is arranged at the position, at the bottom of the core holder, of each cuboid core, the input end is connected with an underground water injection system and a reservoir oil injection system, and on the other hand, the input end is connected to the left end face of each cuboid core. The output end is connected to the positions, on the top of the core holder, ofthe right end faces of the cuboid cores, the inner side face of the core holder is provided with multiple rows of pressure detection points and electrical resistivity detection points which are alternatively distributed, the top of the core holder is connected with a confining pressure tracking pump, the bottom of the core holder is connected with a pressure relief valve, dynamic seepage rule tests of ultra-low permeability oil reservoir bottom water injection of fracturing horizontal seam development are achieved, a theoretical foundation is provided for a water injection scheme, and oil reservoir water injection efficient development is effectively guided.

Description

technical field [0001] The invention relates to a test device and method for optimizing water injection parameters in the field of water injection development in oilfields. The device can realize the dynamic seepage law test of water injection at the bottom of ultra-low permeability oil reservoirs with developed fractured horizontal fractures, and provide a theoretical basis for formulating water injection schemes, effectively Guide the efficient development of oilfield water injection. Background technique [0002] In conventional waterflooding development of fractured horizontal fractures-ultra-low permeability reservoirs, there is often one-way breakthrough of injected water along the heterogeneous high permeability zone or rapid water channeling along the fractures, resulting in small water flooding area, rapid rise of water cut, and rapid recovery of oil wells. There are many problems such as water flooding and low formation energy replenishment efficiency. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20E21B47/00E21B47/06
CPCE21B43/20E21B47/00E21B47/06
Inventor 朱争赵习森党海龙刘滨高涛贾自力石立华冯晓伟李留杰白璞
Owner SHAANXI YANCHANG PETROLEUM GRP