Fracturing method for improving single well yield of low-permeability bottom water reservoir horizontal well

A technology for bottom-water reservoirs and single-well production, which is applied in wellbore/well components, earth-moving drilling and production, and fluid production. The effect of well production, high reliability and low cost

Inactive Publication Date: 2020-06-30
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Low permeability and bottom water reservoirs are characterized by low permeability and developed bottom water. Vertical well development is mainly adopted, and conventional perforation, deflagration fracturing and other stimulation measures are adopted. Due to the low stimulation intensity, single well production is low; conventional hydraulic fracturing is adopted Fractures are easy to press and flow to the bottom water, resulting in water production after fracturing, making it difficult to develop economically and effectively
Staged fracturing of horizontal wells is an effective method to increase single-well production in low-permeability oil and gas reservoirs. However, due to the development of bottom water in low-permeability reservoirs with bottom water, conventional staged fracturing measures are very easy to suppress and channel bottom water, resulting in flooding. Flat wells produce water, and the development effect is poor

Method used

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  • Fracturing method for improving single well yield of low-permeability bottom water reservoir horizontal well
  • Fracturing method for improving single well yield of low-permeability bottom water reservoir horizontal well
  • Fracturing method for improving single well yield of low-permeability bottom water reservoir horizontal well

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Embodiment Construction

[0035] The present invention is further described below in conjunction with accompanying drawing:

[0036] see Figure 1 to Figure 3 , Well A, a horizontal well developed in low-permeability bottom water,

[0037] The horizontal section of the well is X meters long, the permeability is less than 10 mD, and bottom water is developed.

[0038] Proceed as follows:

[0039] 1. According to the boundary line of oil layer and water layer structure in the vertical well of the block, the oil layer structure in the horizontal well section is divided. The structure above the oil-water boundary structure is the structural high point. Combined with the drilling situation of the oil layer in the horizontal section, the structural high point is selected as the perforation position. Divide the horizontal section into N fracturing sections.

[0040] The electrical and physical parameters of the oil layer mainly include resistance, acoustic time difference, gamma, etc. The parameters of the...

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Abstract

The invention discloses a fracturing method for improving single well yield of a low-permeability bottom water reservoir horizontal well. The characteristic of hydraulic sand blasting perforation fracturing point source fracturing initiation is utilized, a high point is preferably constructed to serve as a perforation position, meanwhile, a directional perforation process is combined, namely, upward perforation is conducted, a water layer is prevented from being perforated, upward expansion of cracks is achieved by controlling the fracturing displacement in fracturing, downward expansion of the cracks is controlled, and therefore effective transformation of a bottom water reservoir is achieved.

Description

technical field [0001] The invention belongs to the field of oil recovery engineering, and in particular relates to a fracturing method for increasing single well production of a horizontal well in a low-permeability bottom water reservoir. Background technique [0002] Low permeability and bottom water reservoirs are characterized by low permeability and developed bottom water. Vertical well development is mainly adopted, and conventional perforation, deflagration fracturing and other stimulation measures are adopted. Due to the low stimulation intensity, single well production is low; conventional hydraulic fracturing is adopted Fractures are easy to press and flow to the bottom water, resulting in water production after fracturing, making it difficult to develop economically and effectively. Staged fracturing of horizontal wells is an effective method to increase single-well production in low-permeability oil and gas reservoirs. However, due to the development of bottom w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 徐创朝张矿生唐梅荣陈文斌彭长江王建麾王蓓邓咸安胡超闫永萍
Owner PETROCHINA CO LTD
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