Natural water fracturing construction method

A construction method and natural water technology, applied in the direction of earthwork drilling, mining fluid, wellbore/well parts, etc., can solve the problems that are not conducive to flowback, entering groundwater, environmental pollution, etc., and achieve environmental protection and reduce Effects of pollution and cost reduction

Inactive Publication Date: 2015-09-30
BEIJING RECHSAND SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the drag reducers, stabilizers, and surfactants contained in the fracturing fluid in the existing clear water fracturing technology, mainly polymer compounds, enter the formation along with the clear water, and enter the groundwater through the formation cracks during and after mining, causing Environmental pollution has attracted much attention ("Foreign Oilfield Engineering" 2010 Issue 09)
On the other hand, the viscosity of the fracturing fluid is higher than that of water without additives. When it is flowed back, it consumes a lot of pump power, which leads to cost and is not conducive to all flowbacks.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Using quartz sand (river sand) as the raw material, after scrubbing and drying at 120°C for 5 hours, the sand contains no water at all, and the quartz sand of 20-40 meshes is screened as the aggregate;

[0035] 2) Heat 1000g of screened quartz sand to 200°C, add 1410g of epoxy resin E, and stir evenly;

[0036] 3) Step 2) The temperature of the mixture was lowered to 140°C, and 8g of carboxymethylcellulose was added. Stir well. After cooling, sift.

[0037] The proppant obtained after drying is particles with a particle size of 20-40 mesh (slightly larger than the particle size of the aggregate), and the surface of the aggregate is coated or partially coated with carboxymethyl cellulose polymer material.

Embodiment 2

[0039] 1) Take 1kg of quartz sand (river sand) of 40-70 mesh as aggregate and set aside;

[0040] 2) Heat to 200°C, add 10g of epoxy resin E-06 to the aggregate, when the temperature drops below 140°C, add 10g of polycaprolactone and mix evenly.

[0041] 3) Cool and sieve the mixture obtained in the above step 2).

Embodiment 3

[0043] 1) Take 30-50 mesh 1kg coated sand (manufactured according to the method of Example 1 of patent CN1274626A) as aggregate and set aside;

[0044] 2) First heat the coated sand to 150°C, add 1911g of o-phthalic unsaturated polyester to the aggregate, when the temperature drops to 130°C, add 5g of carboxymethyl hydroxypropyl guar gum, and mix evenly;

[0045] 3) Cool and sieve the mixture obtained in the above step 2).

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Abstract

The invention provides a natural water fracturing construction method for petroleum, natural gas, shale gas, water and other fluid mineral products. 5-60 parts by volume of self-suspension fracturing propping agent is added into 100 parts by volume of natural water to form a propping agent suspension fluid, and then the propping agent suspension fluid is delivered into an underground rock formation. According to the natural water fracturing construction method, an expensive fracturing fluid added with organic polymers is not needed in fracturing, and natural water which can be obtained anywhere is directly used for fracturing. Therefore, pollution is reduced, and cost is reduced. The self-suspension fracturing propping agent adopted in the natural water fracturing construction method is long in suspension time in clear water and can better meet the oil or gas extraction demand. The self-suspension fracturing propping agent can reduce the friction of the fracturing fluid, so that a fracturing propping system adopting the natural water fracturing construction method and an existing fracturing fluid have basic same performance, delivery and flow-back are easy.

Description

technical field [0001] The invention belongs to the field of fluid mineral exploitation such as oil, natural gas, shale gas and water, [0002] Specifically, it relates to a mining method in which fractures are strengthened by bracing. Background technique [0003] When mining minerals that form in subterranean formations, different types of fluids are introduced into the wellbore or the formation surrounding the wellbore. Oilfield crude oil has high viscosity and the fractures of oil reservoirs are narrow. In order to increase oil recovery and reduce costs, fracturing proppant fracturing and propping fracturing are usually used to improve fracture conductivity. There are a variety of stimulation measures used in fracturing operations, including nitrogen foam fracturing, gel fracturing, multi-stage fracturing, clean water fracturing, simultaneous fracturing, hydrojet fracturing, and refracturing. [0004] Water fracturing is a fracturing operation in which a small amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267C09K8/80
Inventor 秦升益胡文进王中学胡炜
Owner BEIJING RECHSAND SCI & TECH GRP
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