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Diversion capacity testing method under non-continuous filling mode

A technology of conductivity and test method, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., can solve the problem that the stability of the proppant packing layer cannot be investigated, the flowback test situation is not considered, and the propped fracture cannot be satisfied. Diversion capacity and other issues, to achieve the effect that the measurement method is practical, the test principle is reliable, and the test method is feasible

Inactive Publication Date: 2016-02-03
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The continuous sanding method can only investigate the conductivity of propped fractures obtained under the conventional continuous sanding method, but cannot meet the analysis of the propped fractures conductivity under the pulse fracturing discontinuous sanding method
[0005] (2) The experimental investigation factors did not take into account the actual flowback test conditions on site, that is, it was impossible to investigate the stability of the proppant packing layer under the action of formation closure pressure and fluid erosion when it was consistent with the actual site conditions

Method used

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  • Diversion capacity testing method under non-continuous filling mode
  • Diversion capacity testing method under non-continuous filling mode
  • Diversion capacity testing method under non-continuous filling mode

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Embodiment 1

[0031] A test method for conductivity under discontinuous filling mode, comprising: first preparing a proppant sand column test piece conforming to the discontinuous filling mode in pulse fracturing hydraulic artificial fractures, and then carrying out proppant fracture diversion under discontinuous sand laying mode ability test.

[0032] The test of the conductivity of propped fractures under the discontinuous sand laying method includes: placing the prepared proppant sand column specimens into the diversion chamber in a discontinuous paving manner, and simulating the formation of the space between the proppant sand column specimens. The fracture trench is discontinuously supported by the proppant sand column test piece, and the fluid flow channel is formed by the discontinuously laid proppant sand column test piece; the experimental parameters are set according to the actual formation conditions. Continuously support fractures, collect test results under different conditions...

Embodiment 2

[0045] The technical problem that the present invention solves mainly contains following two aspects:

[0046](1) Prepare a proppant sand column specimen with the characteristics of discontinuous filling of fractures in pulse fracturing. Pulse fracturing discontinuous sand propped fractures have the following characteristics: artificial hydraulic fractures are filled by discontinuous proppant plungers, and proppant sand columns are used as hydraulic fracture propping stress points to ensure the effectiveness of fracture width and fluid fluidity.

[0047] (2) Referring to the actual production data on site, simulate the deformation of the proppant plunger in the artificial fracture under the dual effects of formation closure pressure and fluid erosion, and test the permeability of the propped fracture under the condition of formation temperature and pressure under the discontinuous sand-laying method and its diversion capacity.

[0048] In order to solve the above two technica...

Embodiment 3

[0061] Firstly, the proppant sand column specimens conforming to the proppant sand column characteristics in the propped fractures under the discontinuous sand-laying method during the post-pulse fracturing test were prepared. With sand concentration 5kg / m 2 1. Under the condition that the diameter of the proppant plunger is 25.4mm, the proppant is 20 / 40 mesh ceramsite as an example. The production method is as follows:

[0062] (1) The sanding concentration is 5kg / m 2 1. On the premise that the diameter of the proppant plunger is 25.4mm, the proppant, fracturing fluid and fiber are prepared in a certain proportion to prepare a mixed sand body;

[0063] The mixed sand body refers to the sand-carrying fluid. The proppant sand concentration of the sand-carrying fluid on site is usually 120kg / m3-620kg / m3 (the mass of proppant sand contained in each fracturing fluid), and the fiber material concentration is usually 1.5kg / m3-3.0 kg / m3 (mass of fiber-containing material per cubic ...

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Abstract

The invention discloses a diversion capacity testing method under a non-continuous filling mode. The method includes the steps of preparing supporting agent sand column test pieces meeting the non-continuous filling mode in pulse fracturing hydraulic artificial cracks, putting the prepared supporting agent sand column test pieces in a diversion chamber in a non-continuous laying mode, forming simulating crack grooves in the spaces between the supporting agent sand column test pieces, conducting non-continuous supporting on the simulating cracks through the supporting agent sand column test pieces, forming fluid flowing channels through the discontinuously-laid supporting agent sand column test pieces, setting experimental parameters according to actual stratum conditions, conducting non-continuous supporting on the cracks under the simulating stratum conditions, collecting test results under different conditions, and calculating the pulse fracturing non-continuous supporting crack diversion capacity. By means of the method, the deformation process of supporting agent sand columns under the effect of stratum closing stress in a non-continuous sand laying mode in the pulse fracturing process can be truly reflected, and the influences of changes of the sand laying mode on the crack diversion capacity can be depicted.

Description

technical field [0001] The invention relates to an indoor evaluation and testing method for the flow conductivity of support fractures in a discontinuous sand-laying mode during the development of oil and gas fields. Background technique [0002] The discontinuous sand-laying method refers to the proppant formed by discontinuously pumping sand-carrying fluid into artificial hydraulic fractures by using special fiber materials and fracturing fluid systems in the process of reservoir stimulation in low-permeability reservoirs. The sand column is laid discontinuously. Field stimulation experience shows that compared with the traditional continuous sanding method, the discontinuous sanding method of pulse fracturing can obtain higher production than the same layer of adjacent wells, and the required fracturing fluid and proppant are lower than conventional fracturing . Since the propped fractures formed by pulsed sand fracturing are restricted by the rock mechanics parameters ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/267
Inventor 陈星宇尹丛彬朱炬辉段明峰王素兵钱斌李彦超
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD