Method for improving productivity of hydraulic fractured well through compound activator

A hydraulic fracturing and activator technology, which is applied in the field of fracturing fluid for oil drilling, can solve the problems of low permeability in low-permeability reservoirs, difficulty in microbial injection, and inability to achieve migration, so as to improve conductivity and increase production Effect, the effect of improving the conduction energy

Active Publication Date: 2014-07-09
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

Due to the low permeability of low-permeability oil reservoirs, conventional microbial injection is difficult and effective migration cannot be achieved, and bacteria filter cakes are more likely to be formed near the wellbore. Although this technology proposes that microbial oil recovery technology can be applied to fracturing wells, it does not The above-mentioned technical problems have not been solved

Method used

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  • Method for improving productivity of hydraulic fractured well through compound activator
  • Method for improving productivity of hydraulic fractured well through compound activator
  • Method for improving productivity of hydraulic fractured well through compound activator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Test of the properties of the fracturing fluid residue to be tested:

[0067] In order to reveal the source of fracturing fluid residues, the experiment was designed as follows:

[0068] ① Prepare the aqueous solutions of various fracturing additives with on-site water samples, and observe them after standing for several days.

[0069] ②Take a single solution and mix with each other to observe the compatibility with each other.

[0070] ③ If a precipitate precipitates, centrifuge the precipitated precipitate, and measure the mass after drying at 105°C to constant weight.

[0071] Table 2 Amount of water-insoluble matter from different sources in HPG fracturing fluid (1L)

[0072]

[0073] Note: 1. 3000r / min centrifugal volume for 20 minutes; 2. Puyang Tongzhou Ceramsite Sand Factory 0.45~0.90mm, 69MPa ceramsite.

[0074] Test results: Potassium chloride aqueous solution contains a small amount of black water-insoluble matter, which is dissolved in brownish-yellow...

Embodiment 2

[0078] Guar gum anaerobic degradation test: Clostridium butyricum (Clsotridium butyricum CGMCC1.336) and Clostridium acetobutyricum (Clsotridium acetobutyricum CGMCC1.70) were used in the anaerobic degradation test of guar gum, wherein the concentration of Clostridium butyricum in the Clostridium butyricum bacterial agent was 2~5×10 7 CFU / ml, the amount of the microbial agent in the filtrate is 1% of the volume of the filtrate by volume ratio; the concentration of microorganisms in the Clostridium acetonebutylicum agent is 2~5×10 7 CFU / ml, the amount of the microbial agent in the filtrate is calculated as 1% of the volume of the filtrate by volume ratio; its gel breaking ability in the formation is tested according to the method of "SY / T5107-2005 Water-based Pressure Fluid Performance Evaluation Method" . The test was filled with N 2 The lactic acid tube was carried out, and the guar gum after ammonium persulfate (APS) was broken was used as the nutrient substrate. The gas...

Embodiment 3

[0084] Microorganisms used in guar gum damage formation plugging removal performance evaluation experiment:Use the low-permeability natural core of Songnan igneous rock, drill the natural core in the direction parallel to the fluid flow of the reservoir to drill a cylinder, grind the two ends flat, and be perpendicular to the smooth cylindrical surface. The diameter of the core is 25mm-25.4mm or 37mm-38mm, and the length of the core is 1-1.5 times of the diameter. Prepare three rock cores of the same specifications according to the above standards, named respectively as rock core A, rock core B, and rock core C, and reserve them for later use in the experiment; the cleaning and drying of the rock cores are carried out in accordance with SY / T5336-1996, and the gas permeability of the rock cores after cleaning and drying And the determination of pore volume is carried out according to SY / T5336-1996. The determined rock core shall establish the irreducible water saturation acco...

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Abstract

The invention discloses a method for improving productivity of a hydraulic fractured well through compound activator. The method for improving the productivity of the hydraulic fractured well through the compound activator includes that leading compound activator A composed of an electron acceptor and nutrient or compound activator B composed of the electron acceptor, the nutrient and microbial agent into a target stratum, and selectively controlling the multiplication and metabolic activity of microorganism in the target stratum to remove stratum pollutant and generate useful metabolites to improve the productivity of the fractured well. According to the method for improving the productivity of the hydraulic fractured well through the compound activator, a microorganism field is generated in the reservoir space of the target stratum, residual guanidine gum filter cakes caused by fracturing or the heavy hydrocarbon pollutant generated by oil and gas production is eliminated, the current guide ability of the hydraulic crack body is improved, and meanwhile, the useful microorganism metabolites are generated, the oil and water phase interface tension is lowered, the crude oil is emulsified and is high in liquidity, and accordingly the productivity increasing effect of the fracturing construction is improved, and the productivity of the fractured well is improved.

Description

technical field [0001] The invention relates to a biological fracturing fluid in the field of fracturing fluid for petroleum drilling, and furthermore, relates to a method for improving the productivity of a hydraulic fracturing well by using a composite activator. Background technique [0002] Fracturing is an important means of oil and gas field development, especially the main production stimulation means of low permeability oil and gas reservoirs. During construction, damage zones are also formed near the fracture wall, which increases the seepage resistance of the matrix and affects the increase in productivity. In actual operation, after the fracturing fluid breaks, more gel-breaking fluid stays in the formation and cannot be completely flowed back to the ground. Because the gel-breaking fluid contains various chemical components, it interacts with formation rock minerals to produce multiple effects, and the vector superposition of several effects will affect the seepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/22
Inventor 李宗田郑承纲苏建政张汝生刘长印赵梦云黄志文孙志宇林鑫贺甲元杨科峰
Owner CHINA PETROLEUM & CHEM CORP
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