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Flow guiding and fracturing method

A technology of diversion pressure and fracturing, which is applied in the direction of chemical instruments and methods, production fluids, earthwork drilling and production, etc. It can solve the problem that the concentration of proppant section reduces the height of proppant column, it is difficult to ensure proppant, and there is no obvious boundary between flow channels, etc. problems, to achieve the effect of being conducive to flowback, realizing production capacity, and less damage

Active Publication Date: 2013-04-03
PETROCHINA CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, it is still difficult to ensure that the proppant is not uniformly distributed in the fracture and during fracture closure during transport from the pumping equipment to the fracture
The biggest risk is the dispersion of the proppant pulse segment during its transport. The dispersion of the proppant slug will lead to the failure of this technique, because it will reduce the concentration of the proppant segment before fracture closure and reduce the height of the proppant column. This also results in flow channels with no clear demarcation

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Embodiment Construction

[0025] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0026] In order to eliminate the dependence of fracture conductivity on proppant performance, the invention adopts special technological means to build open channels in fractures to form higher fracture conductivity and smoother reservoir fluid channels. This process enables proppant to be placed non-uniformly in the fracture in the form of pillars (see figure 1 ). Here the proppant no longer acts as a diversion medium, but as a support to prop up the fracture wall around the channel. The formation of channels in fractures is a combination of specific perforation schemes, pumping procedures, and fracturing fluid design.

[0027] In order to place proppant non-uniformly in the fracture in the form of proppant pillars, the present invention employs a fracturing procedure as described below.

[0028] (1) Perforation scheme: use non-uniform perforation consisting...

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Abstract

The invention relates to a flow guiding and fracturing method. The flow guiding and fracturing method is characterized in that the adding of propping agent and the designing of fracturing fluid are carried out through unevenly perforating in a short pulse mode, the propping agent can be unevenly placed in a fracturing seam in a pier column mode, i.e. the expansion of the fracturing seam is kept by forming a propping agent pier column in a fractured fracturing seam, oil gas flows through a channel formed by the propping agent pier column without passing through a propping agent filling body any more, unlimited flow guiding capacity can be generated due to a pier column structure, the flow back of liquid and polymer can be more facilitated, and the damage to the surface of the fracturing seam is smaller. The flow guiding capacity of the fracturing seam formed by the fracturing of the propping agent pier column does not depend on the performance of the propping agent, and thus the propping agent in high quality does not need to be chosen.

Description

technical field [0001] The invention relates to an oil-gas well fracturing process in the technical field of petroleum and natural gas exploitation, in particular to a new low-damage oil-gas reservoir fracturing method. Specifically, the present invention relates to a novel fracturing method that achieves greater oil and gas recovery by increasing the conductivity and half-length of the effective fracture, that is, forming uneven proppant pillars in the fractures that are opened. Keeping the fractures open, the oil and gas no longer pass through the proppant packing body, but flow through the channels formed by the proppant pillars. This pillar structure can generate infinite flow conductivity, which is more conducive to the flowback of liquids and polymers , and less damage to the crack surface. Background technique [0002] my country's low-permeability oil and gas resources are huge, accounting for more than 70% of the total proven reserves, and are the main potential ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267C09K8/68
Inventor 周福建刘玉章丁云宏卢拥军刘雄飞杨贤友石阳张建国张福祥熊春明杨向同车明光
Owner PETROCHINA CO LTD
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