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Method for evaluating sand-carrying ability of slickwater pressing crack liquid of compact reservoir

A technology for tight reservoirs and evaluation methods, which is applied in the field of oil exploitation, can solve the problems of no quantitative research results, the inability to quantitatively evaluate the sand-carrying ability of slick water, and the labor intensity of experiments, etc., and achieve the effect of simple and easy test methods

Inactive Publication Date: 2018-08-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Two different fracturing fluids with a viscosity difference of 100 times will be used in one fracturing, and the applicability of the viscosity evaluation method is challenged
Viscosity-based evaluation methods cannot meet the needs of technological progress in fracturing fluid systems
[0005] Wen Qingzhi of China University of Petroleum (East China) published "Dynamic Experiment of Slippery Water Carrying Performance", which provides a method for evaluating the performance of slick water carrying sand, using a large-scale visual flat plate crack simulation system to visually observe the placement of proppant, so that the proppant The dynamic settlement of the agent in the fracture and the visualization of the shape of the sand bank, but it is impossible to quantitatively evaluate the sand-carrying ability of the slick water
Hu Feifei from Xi'an Petroleum University published "Research on Slippery Water Fracturing Fluid and Its Sand-carrying Capacity in Yanchang Continental Shale Gas Reservoirs", which provides a simulation evaluation by observing the law of sand bank height and length changing with time in each stage The sand-carrying capacity of slick water fracturing fluid is also observed through plate fractures. The experiment is labor-intensive and inefficient, so it cannot be directly quantified
[0006] Although the viscoelasticity test abroad can evaluate which of fluid elasticity and viscosity is dominant at reservoir temperature, there are no quantitative research results on its relationship with fracturing fluid sand-carrying in fractures at home and abroad.

Method used

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  • Method for evaluating sand-carrying ability of slickwater pressing crack liquid of compact reservoir
  • Method for evaluating sand-carrying ability of slickwater pressing crack liquid of compact reservoir
  • Method for evaluating sand-carrying ability of slickwater pressing crack liquid of compact reservoir

Examples

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Embodiment 1

[0032] In order to overcome the existing technical problems, this embodiment provides an evaluation method for the sand-carrying ability of slickwater fracturing fluid in tight reservoirs. The technical solution of the present invention is to provide a sand-carrying ability of slickwater fracturing fluid in tight reservoirs The evaluation method of ability includes the following steps:

[0033] Step 1. Add proppant to the slick water fracturing fluid and stir evenly so that the proppant is completely suspended in the slick water fracturing fluid;

[0034] The slick water fracturing fluid is a polymer-based slick water fracturing fluid for tight reservoir reconstruction, including EM30 slick water, EM30S slick water, etc., but not limited thereto. The slick water fracturing fluid is a commonly used product in this field. directly available for purchase.

[0035] Preferably, the mass percentage of the proppant added to the slick water fracturing fluid is 5-15%.

[0036] Step 2...

Embodiment 2

[0049] This example provides a method for evaluating the sand-carrying capacity of guar gum slick water fracturing fluid indoors, the test temperature is 60°C, and the steps are as follows:

[0050] Step 1. Configure guar gum slick water fracturing fluid: 0.08% guar gum + 0.5% potassium chloride + 0.5% sodium dodecylbenzenesulfonate + 98.02% water, add proppant to the guar gum slick water fracturing fluid , the proppant accounts for 10% by mass of the guar gum slick water fracturing fluid, and it is evenly stirred so that the proppant is completely suspended in the slick water fracturing fluid;

[0051] Step 2. Put the guar gum slick water fracturing fluid prepared in step 1) into the Haake RS6000 rheometer. The rotor of the rheometer is selected as follows: figure 1 The helical rotor 1 shown, records the rheometer rotor stress τ 1 over time t 1 changes in

[0052] Step 3, take time t 1 is the abscissa, the rotor stress τ 1 Draw a curve for the ordinate, that is, the rheo...

Embodiment 3

[0056] This example provides a method for evaluating the sand-carrying capacity of polymer slickwater fracturing fluid indoors. The test temperature is 30°C. The steps are as follows:

[0057] Step 1. Configure polymer slick water fracturing fluid: 0.25% polyacrylamide + 0.5% potassium chloride + 0.5% hexadecyltrimethylammonium bromide, the rest is water, in polymer slick water fracturing fluid Add proppant, the proppant accounts for 15% by mass of the polymer slick water fracturing fluid, and stir evenly so that the proppant is completely suspended in the slick water fracturing fluid;

[0058] Step 2. Put the polymer slick water fracturing fluid prepared in step 1) into the flow rate rotary viscometer. The rotor of the flow rate rotary viscometer is selected as follows: figure 2 The paddle-type rotor 2 shown, record the rheometer rotor stress τ 2 over time t 2 changes in

[0059] Step 3, with time t 2 is the abscissa, the rotor stress τ 2 Draw a curve for the ordinate, ...

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Abstract

The invention provides a method for evaluating sand-carrying ability of slickwater pressing crack liquid of a compact reservoir. The slickwater pressing crack liquid generates different torsional forces with time change on a cross section, the slickwater pressing crack liquid sand-carrying condition under different shearing rates can be reflected by a suspended sand rheological curve, so that thesand-carrying ability of the slickwater pressing crack liquid is evaluated, and the method is also suitable for evaluating the sand-carrying ability of a crosslinking plant glue and non-crosslinked associated pressing crack liquid. By using a common pressing crack liquid evaluation apparatus, a rheometer rotor is improved, and the testing method for evaluating sand-carrying ability of the slickwater pressing crack liquid is obtained, the problem of non sand carrying and non evaluation of the sand-carrying ability of the slickwater pressing crack liquid of the routine rheometer can be solved, shearing under well is simulated by a rotating speed of the rotor, the dynamic sand suspending is simulated by a sand suspending rotor, and the sand-carrying ability testing result approaches the practical condition under well. The method is simple and easy to carry out, and sand-carrying ability of the slickwater can be completed in a routine laboratory.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an evaluation method for the sand-carrying capacity of slick water fracturing fluid in tight reservoirs. Background technique [0002] For the technical requirements of tight reservoir stimulation, slick water has become one of the main fracturing fluid technologies for tight oil and gas stimulation. With the development of tight reservoirs, slickwater fracturing fluids are more widely used. [0003] The shear rheological performance evaluation based on viscous sand-carrying theory is the most classic evaluation method for sand-carrying performance. The current performance evaluation methods for fracturing fluids are mainly based on viscosity-based shear evaluation methods. This method can better reflect the shear rheological properties of vegetable gum fracturing fluid. The lower friction and better application performance of slick water fracturing fluid support the tran...

Claims

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 郭钢赵振峰张矿生薛小佳唐梅荣李楷吴江范华波刘锦周晓群白晓虎刘怡鲜晟张翔
Owner PETROCHINA CO LTD