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Method and device for testing crosslinking time of gel type fracturing fluid

A test method and test device technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as large errors, and achieve the effect of solving large human influence factors, scientific methods of crosslinking time, and few human influence factors

Pending Publication Date: 2020-07-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a test method and testing device for the crosslinking time of jelly-type fracturing fluid, to solve the problem that the existing method for testing the crosslinking time of jelly-type fracturing fluid has large errors

Method used

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  • Method and device for testing crosslinking time of gel type fracturing fluid
  • Method and device for testing crosslinking time of gel type fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The fracturing base fluid is 0.35wt% guar gum aqueous solution, and the crosslinking agent is an aqueous solution of 0.3wt% organoboron and 0.05wt% sodium hydroxide, wherein the fracturing base fluid is swelled for 2 hours after the preparation is completed, and then the experiment is carried out; crosslinking The ratio is 100:1, that is, the volume ratio of the fracturing base fluid and the crosslinking agent is 100:1 when preparing the fracturing fluid jelly.

[0036] Test method for jelly crosslinking time:

[0037] (1) Measure 1000mL of distilled water and pour it into the mixing device (Wu Yin mixer). Adjust the rotation speed of the mixing device until the vortex formed by the liquid can see the top of the central shaft of the paddle of the mixing device. Weigh 3.5g (can be adjusted according to the formula ratio) of guar gum powder and slowly add it to the mixing device, and adjust the rotating speed at all times to ensure that the vortex formed by the liquid ca...

Embodiment 2

[0043] Using the base liquid and cross-linking agent prepared in Example 1, the cross-linking time of the same sample was tested by testing the blade torque.

[0044] Cross-linking time test method for testing jelly viscosity value:

[0045] (1) Measure 400mL of fracturing fluid base fluid that has been swollen and pour it into the mixing cup of the mixing device (Wu Yin mixer), and adjust the speed of the agitator until the bottom of the vortex sees the center axis of the blade of the mixing device. up to the top;

[0046] (2) Connected to the mixing device, the device unit of the tester blade torque is connected to the computer, and the computer can transmit and record the blade torque when the mixer rotates in real time;

[0047] (3) Measure 4mL of cross-linking agent (can be adjusted according to the ratio of the fracturing fluid formula), add it to the mixing cup of the mixing device, use the detection device (torque detection device) to test the blade torque during the ...

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Abstract

The invention provides a method and device for testing the crosslinking time of a gel type fracturing fluid. The method comprises the following steps that: a fracturing base fluid and a cross-linkingagent are prepared separately; the fracturing base fluid and the cross-linking agent are added into a mixing device, and stirring is performed, then, a gel type fracturing fluid can be obtained; in astirring process, the viscosity of the gel type fracturing fluid or the blade torque of the mixing device is tested by adopting a detection device, and test time and viscosity values or blade torquesare recorded; and the recorded data are compared, the time corresponding to the maximum value of the viscosity value or the maximum value of the blade torque is determined as the crosslinking time ofthe gel type fracturing fluid. Compared with the existing method for judging the crosslinking time by naked eyes, the method for testing the crosslinking time provided by the invention is more scientific and is less influenced by human factors, and meanwhile, the relative deviation of multiple tests of the crosslinking time of the gel type fracturing fluid can be controlled within 5%.

Description

technical field [0001] The invention relates to the field of oilfield exploitation, in particular to a test method and a test device for the crosslinking time of jelly-type fracturing fluid. Background technique [0002] The newly proven oil and gas reservoirs in Xinjiang Oilfield, Changqing Oilfield and other oilfields are mostly low porosity and low permeability reservoirs, and fracturing is one of the effective measures for the efficient development of such reservoirs. Fracturing is the use of fracturing fluid to carry qualified proppant into the formed reservoir fractures to achieve the purpose of increasing the reservoir permeability. The sand-carrying performance of fracturing fluid is crucial to the success of fracturing, and the crosslinking time is an important parameter affecting the sand-carrying performance of fracturing fluid. If the fracturing fluid cross-links too quickly, the instantaneously formed jelly will be thinned by high-speed shear in the pipe string...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N11/14
CPCG01N11/00G01N11/14
Inventor 郝红永杨兴渝郭晟豪牛丽孙占玲吕振华韩晓强徐景润徐冬梅
Owner PETROCHINA CO LTD