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Multi-dimensional pipe fracturing method for low-yield well in low permeability oilfield

A technology for oilfields and production wells, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve problems such as too fast addition of temporary plugging agent, low pump efficiency and interruption of fracturing pumps, and achieve improved The effect of single well production and increasing drainage area

Active Publication Date: 2018-10-12
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through years of development, the temporary plugging fracturing technology has achieved good fracturing effects, but there are still many problems, including the low pump efficiency of the fracturing pump caused by the addition of temporary plugging agents, and the rapid addition of temporary plugging agents leads to The oil pressure exceeds the limited maximum pressure, etc., resulting in discontinuous or even interruption of construction, which seriously affects the stimulation effect of low-yield oil wells after repeated fracturing

Method used

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  • Multi-dimensional pipe fracturing method for low-yield well in low permeability oilfield
  • Multi-dimensional pipe fracturing method for low-yield well in low permeability oilfield
  • Multi-dimensional pipe fracturing method for low-yield well in low permeability oilfield

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Experimental program
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Effect test

Embodiment 1

[0027] A multi-dimensional tubular fracturing method for low-production wells in low-permeability oilfields includes the following steps:

[0028] 1) Low-displacement pumping of fracturing fluid to displace oil, water or oil-water mixture in the primary fracturing artificial fractures;

[0029] 2) Increase the construction displacement and suspend the proppant in the primary fracturing artificial fracture in the fracturing fluid;

[0030] 3) Using the fluid loss of the fracturing fluid in the formation, the proppant in step 2) is transported to the end of the primary fracturing artificial fracture to form accumulation;

[0031] 4) Increase construction displacement to increase net pressure in cracks and open micro-cracks;

[0032] 5) After the acid-carrying fracturing fluid dissolves the walls of the main fractures and micro-fractures, sand fracturing is performed;

[0033] 6) Control blowout after fracturing operation;

[0034] 7) The construction is over.

Embodiment 2

[0036] A multi-dimensional tubular fracturing method for low-production wells in low-permeability oilfields includes the following steps:

[0037] 1) Low-displacement pumping of fracturing fluid to displace oil, water or oil-water mixture in artificial fractures for primary fracturing; the viscosity of fracturing fluid is 20mPa.s-40mPa.s under the formation condition of 40-70℃.

[0038] The low displacement pump injection is: so 0.2-0.5m 3 / min displacement pumping fracturing fluid 30-50m 3 , to displace the oil, water or oil-water mixture in the primary fracturing artificial fractures to the formation pores.

[0039] The fracturing fluid is formulated by compounding the following raw materials according to the following mass percentages: 1.0%-3.5% bis-quaternary ammonium-based bisphenyl surfactant, 1.2%-3.5% ethanol, 0.5%-1.8% sulfur base salicylic acid and 91.2%-97.3% water.

[0040] The bis-quaternary ammonium-based bisphenyl surfactant is di(p-phenylcarbamate diethylalk...

Embodiment 3

[0053] A multi-dimensional tubular fracturing method for low-production wells in low-permeability oilfields includes the following steps:

[0054] 1) Low displacement (0.5m 3 / min) pumping fracturing fluid 50m 3 , to displace the oil, water or oil-water mixture in the primary fracturing artificial fracture;

[0055]The fracturing fluid is formulated by compounding the following raw materials according to the following mass percentages: 1.0%-3.5% bis-quaternary ammonium-based bisphenyl surfactant, 1.2%-3.5% ethanol, 0.5%-1.8% sulfur base salicylic acid and 91.2%-97.3% water.

[0056] The bis-quaternary ammonium-based bisphenyl surfactant is di(p-phenylcarbamate diethylalkylammonium ethyl bromide) methane, and its molecular formula is as follows:

[0057]

[0058] Wherein, n is 11, 13 or 15.

[0059] 2) Increase construction displacement (1.0m 3 / min), the proppant in the primary fracturing artificial fracture is suspended in the fracturing fluid, and the viscosity of th...

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Abstract

The invention relates to a multi-dimensional pipe fracturing method for a low-yield well in a low permeability oilfield. The multi-dimensional pipe fracturing method is characterized by comprising thefollowing steps that (1) fracturing liquid is injected through a low-displacement pump to displace oil and water or oil and water mixtures in initial fracturing artificial fractures; (2) the construction displacement is increased, and propping agents in the initial fracturing artificial fractures are suspended in the fracturing liquid; (3) through filtration of the fracturing liquid in a stratum,the propping agents are transported to the ends of the initial fracturing artificial fractures to be accumulated; (4) the construction displacement is increased to increase the net pressure in the fractures, and the micro fractures are opened; (5) after the fracturing liquid capable of carrying acid liquor corrodes the wall faces of the main fractures and the micro fractures, sand fracturing is conducted; (6) after fracturing operation is completed, blowout is controlled; and (7) construction is completed. According to the multi-dimensional pipe fracturing method, repeated fracturing of the low-yield well in the oilfield is achieved through optimization of the process method to open the micro fractures to form a multi-dimensional pipe fracturing system, and the target of increasing the single well yield of the low-yield well in the oilfield is achieved.

Description

technical field [0001] The invention relates to a fracturing stimulation operation used in low-permeability oil reservoir low-production well reconstruction, in particular to a multi-dimensional tube fracturing method for low-production wells in low-permeability oil fields. The utility model belongs to the technical field of increasing production used in oil exploitation. Background technique [0002] Low-permeability oilfield reservoirs have poor physical properties, strong heterogeneity, low pressure coefficient, and fast production decline rate. Ensuring long-term effective and stable production of oil wells is an important problem faced by oilfield development. After long-term production of oil wells in low-permeability oilfields, due to unbalanced or ineffective water injection development, it is impossible to establish an effective displacement system. The production of oil wells is at a low level, and the input and output are relatively low under the current low oil p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/27C09K8/68
CPCC09K8/68E21B43/26E21B43/267
Inventor 陈柯全任雁鹏
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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