Method for injecting oil-displacing agent into oil layer by utilizing fracturing prepad fluid to improve recovery efficiency

A technology of pre-fluid and recovery factor, applied in chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve problems such as injection failure.

Active Publication Date: 2021-07-30
XINJIANG ZHENGTONG OIL & GAS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned problems in the prior art, the present invention provides a method for injecting the oil displacement agent into the oil layer by using the fracturing pre-fluid to improve the recovery ...

Method used

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Examples

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Embodiment 1

[0027] The present invention utilizes the fracturing pre-fluid to inject the oil-displacing agent into the oil layer to improve the recovery rate, and to carry out the fracturing design and construction, comprising the following steps:

[0028] (1) Carry out crude oil component analysis and core displacement and imbibition evaluation on fracturing wells, and screen out the available formulations of tertiary oil recovery chemical agents for fracturing prefluids; the specific steps are as follows:

[0029] Crude oil component analysis includes: crude oil component analysis through the determination of crude oil wax, colloid, asphaltene content and crude oil wax precipitation temperature experiment. The crude oil component is reflected in the form of carbon number, and the carbon number distribution reflects the difficulty of wax formation degree of ease.

[0030] Core displacement evaluation is to use special core nuclear magnetic resonance equipment to detect the distribution c...

Embodiment 2

[0045] The embodiment of the present invention provides a method of using fracturing prefluid to inject oil displacement agent into the oil layer to enhance the recovery factor. Taking advantage of the opportunity of fracturing reconstruction construction, adding energy-enhancing, displacement and imbibition tertiary oil recovery chemical agents to fracturing In the pre-fluid, and injected into the third type or tight oil reservoir to greatly enhance the recovery factor. In the specific steps, steps (1)-(4) and (6) are all the same as in Example 1; in the step (5), the tertiary oil recovery chemical agent for the fracturing preflush consists of: 0.5wt% polyacrylamide (molecular weight is 1500 10,000 to 20 million), 1.8wt% ethoxy-modified polytrisiloxane, 0.5wt% naphthenate, 1.5wt% sodium dodecylbenzenesulfonate, and the rest is water.

Embodiment 3

[0047] The embodiment of the present invention provides a method of using fracturing prefluid to inject oil displacement agent into the oil layer to enhance the recovery factor. Taking advantage of the opportunity of fracturing reconstruction construction, adding energy-enhancing, displacement and imbibition tertiary oil recovery chemical agents to fracturing In the pre-fluid, and injected into the third type or tight oil reservoir to greatly enhance the recovery factor. In the specific steps, steps (1)-(4) and (6) are all the same as in Example 1; in the step (5), the tertiary oil recovery chemical agent for the fracturing preflush consists of: 0.6wt% polyacrylamide (molecular weight is 1500 10,000 to 20 million), 2wt% fatty alcohol polyoxyethylene ether, 0.5wt% naphthenate, 1wt% sodium dodecylbenzenesulfonate, and the rest is water.

[0048] The principle of the technical scheme of the method for injecting the oil displacement agent into the oil layer by using the fracturing...

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Abstract

The invention relates to a method for injecting an oil-displacing agent into an oil layer by utilizing fracturing prepad fluid to improve the recovery efficiency. By utilizing the opportunity of only one-time fracturing transformation, energy-increasing, huff and puff, replacement and imbibition three-time oil recovery chemical agents are added into the fracturing prepad fluid, the energy-increasing, huff and puff, imbibition and oil-displacing chemical agents are injected into the oil layer to improve the recovery efficiency, the yield of a fractured well can be greatly increased, the oil increasing effect is obvious, the yield increasing effect of fracturing transformation is improved, and the single well recovery efficiency is increased. The huff and puff, imbibition and oil-displacing chemical agent system has the advantages of high oil washing effect, low viscosity, high permeability, low corrosivity and the like. According to the method for injecting the oil-displacing agent into the oil layer by utilizing fracturing prepad fluid to improve the recovery efficiency, secondary and tertiary oil recovery processes are combined with fracturing transformation, huff and puff, imbibition and oil-displacing chemical agents are injected into an oil layer to improve the recovery efficiency, the yield of the fractured well can be greatly increased, the oil increasing effect is obvious, the yield increasing effect of fracturing transformation is improved, the single well recovery efficiency is increased, and important significance is achieved on development of unconventional tight oil reservoirs at home and abroad at present.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for injecting an oil-displacing agent into an oil layer by using a fracturing pre-fluid to increase recovery. Background technique [0002] At present, with the development of petroleum exploration technology, some tight oil and tight reservoirs with tens of millions of tons of oil reservoirs have been discovered one after another at home and abroad. Due to deep burial, low porosity and low permeability, these reservoirs cannot be injected with water and cannot be watered. Flooding development can only adopt the production mode of horizontal well staged one-time fracturing and depletion recovery. The recovery rate of this mining method is low, and the remaining oil that cannot be effectively utilized is still more than 85%, and a large amount of remaining oil has not been exploited. Because the exploitation methods and technology cannot meet the exploitat...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/16E21B43/30C09K8/68
CPCE21B43/26E21B43/16E21B43/30C09K8/68
Inventor 牟善波王成君张尚明卢奕泽代礼兵李望
Owner XINJIANG ZHENGTONG OIL & GAS CO LTD
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