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High-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs

A carbonate reservoir, fracture-cavity technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc.

Active Publication Date: 2015-12-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, there is no efficient acid fracturing design method for fractured-cavity carbonate reservoirs based on improving the conductivity of the distal end of the fracture.

Method used

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  • High-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs
  • High-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs
  • High-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs

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Embodiment 1

[0068] In the development of fracture-vuggy reservoirs in Well X of Tahe Oilfield, in the original design plan of the construction party, the total amount of acid construction is 254m 3 , the type of acid solution is gelled acid with hydrochloric acid concentration of 12% by mass, using 3m 3 / min fixed displacement design. Using this method to calculate, the amount of acid solution is 200m 3 , the actual use of front 150m 3 The concentration of hydrochloric acid is 20% by mass after the gelling acid is chased into 50m 3 Non-reactive water-based fracturing fluid; use a maximum displacement of 5m 3 / min discharge reduction design. figure 1 Influence of different pump injection methods on fracture conductivity. From figure 1 Visible, relative to 3m 3 / min of constant discharge design, after adopting the design of reduced discharge, the far-end conductivity of the fracture has been significantly improved, and the effective length of the fracture has increased from 71m to 83...

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Abstract

The invention discloses a high-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs. The high-efficiency acid fracturing method comprises the following sequential steps of S1. calculating the amount of an acid solution (Vsum), S2. designing a solution for acid fracturing, S3. designing a pump injection process, and S4. designing a residual acid flow back process. The fracture-cavity carbonate reservoirs include a fracture reservoir, a cavity reservoir and a fracture-cavity reservoir. The amounts of an acid solution corresponding to different kinds of fracture-cavity carbonate reservoirs can be calculated by the method, on the premise of an acid fracturing effect, a high density acid solution is injected through a pump, then a non reaction solution is injected through the pump, a method capable of injecting four stepped displacements at equal time intervals through a pump is adopted to raise the utilization efficiency of an acid solution, and residual acid in reservoirs can flow back to the ground as much as possible. The high-efficiency acid fracturing method suitable for fracture-cavity carbonate reservoirs is reliable in principle and simple in design, can effectively reduce the amount of an acid solution, raise the diversion capacity of a far end fracture, so as to effectively reduce the acid fracturing cost of a fracture-cavity carbonate reservoir, raise the yield increase effect of acid fracturing, so the high-efficiency acid fracturing method has a good market prospect.

Description

technical field [0001] The invention relates to a high-efficiency acid fracturing method suitable for fracture-cave carbonate reservoirs, belonging to the field of oil and gas field development. technical background [0002] For acid fracturing in conventional oil reservoirs, more attention is usually paid to the flow conductivity at the opening of artificial fractures, because the entire acid fracturing fracture in conventional oil reservoirs has fluid entering, and the flow at the opening is the largest. If the conductivity at the fracture opening is too low, it will directly limit the productivity of acid fracturing wells, so conventional oil reservoirs generally try to increase the conductivity at the fracture opening as much as possible. However, the actual situation of acid fracturing wells in fracture-cavity reservoirs is quite different. Taking Tahe Oilfield as an example, the matrix in Tahe Oilfield is tight, and the oil supply capacity is basically negligible. The ...

Claims

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Application Information

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IPC IPC(8): E21B43/27
Inventor 李勇明赵金洲刘作磊彭瑀
Owner SOUTHWEST PETROLEUM UNIV
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