Oil field fracturing transformation method

An oil field fracturing and oil displacement technology, applied in the field of oil exploitation, can solve the problems of high cost and low recovery rate

Active Publication Date: 2016-12-21
PETROCHINA CO LTD
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Problems solved by technology

[0005] In order to solve the problem of low recovery rate and high cost of fracturing stimulation in low-permeability and tight reservoirs with no natural fractures, the purpose of the present invention is to provide an oilfield fracturing stimulation method, which can Combined with ...

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Embodiment

[0045] This embodiment provides a kind of oilfield fracturing reconstruction method, taking a certain well (the well reservoir is a low-permeability, tight reservoir with no natural fractures) as an example to carry out inter-fracture displacement fracturing reconstruction, which includes the following steps:

[0046] Step 1. The core wettability test shows that the reservoir of this well is characterized by mixed wetting. Through experimental tests, the betaine-type amphoteric that can effectively reduce interfacial tension, reduce fluid seepage resistance, and achieve wettability change was selected. Surfactant, at the same time, in order to improve the oil displacement efficiency, inorganic salt NaCl (addition amount is adjusted according to the actual situation) is used as oil displacement active water. Such as figure 1 It can be seen that after adding active water for oil displacement, the fluid displacement distance increases significantly.

[0047] figure 2 The oil r...

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Abstract

The invention provides an oil field fracturing transformation method. The method comprises the steps of selecting oil-driving activated water according to reservoir wettability, utilizing simulation software to work out a fracture spacing of an effective displacement pressure system and a minimum fracture spacing for avoiding stress interference, and combining and optimizing to obtain an optimal fracture spacing; carrying out conventional fracturing transformation on a first section of a horizontal well with adding a support agent, carrying out large-scale oil-driving activated water fracturing transformation on a second section of the horizontal well without adding the support agent, alternatively carrying out the two fracturing processes on follow-up well sections, and after the fracturing is finished, closing the well, and carrying out open flow production after fracture closure. According to the oil field fracturing transformation method provided by the invention, subdivision cutting fracturing transformation and fracturing fracture interval displacement are combined, and traditional interwell long distance displacement is transformed to fracture interval short distance displacement on the same well and same layer, so that the displacement pressure system is favorably built, and the oil recovery ratio can be greatly improved; the usage of the support agent and fracturing fluid gel is greatly reduced, so that the fracturing transformation cost is greatly reduced, and an important method is provided for qualitatively and beneficially developing low-osmolar and compact reserves.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to an oil field fracturing reconstruction method. Background technique [0002] Low-permeability and tight reservoirs have become the most realistic and important oil and gas resource replacement areas in China. Drawing on the North American shale gas "horizontal well + volumetric fracturing" technology, my country has successfully realized The effective development of such tight oil blocks has established a production capacity of 2 million tons. However, the development of such reservoirs faces bottleneck problems such as fast production decline (3-year production decline reaches 85%), low recovery rate (natural energy recovery degree is 5%-8%), and high development cost. [0003] At present, there are three main technical measures adopted for the development of low-permeability tight reservoirs: (1) The development mode of horizontal well staged fracturing combined wi...

Claims

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Application Information

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IPC IPC(8): E21B43/20E21B43/26E21B43/267
CPCE21B43/20E21B43/26E21B43/267
Inventor 才博何春明许江文承宁毕国强王佳陈进高跃宾段贵府李帅
Owner PETROCHINA CO LTD
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