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Device and method used for evaluating flushing liquid

A technology of flushing fluid and flushing fluid tank, which is used in flushing wellbore, earthmoving, wellbore/well components, etc., can solve the problems of lack of validity of evaluation methods, distortion of evaluation results, and many influencing factors.

Active Publication Date: 2016-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple, it cannot effectively simulate the wellbore, and the evaluation method lacks effectiveness
On-site application and evaluation are mainly carried out through test wells, but due to many factors affecting the site, it is easy to cause distortion of evaluation results

Method used

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  • Device and method used for evaluating flushing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The first outer detection cylinder 7 was weighed by the evaluation unit to obtain 1231.1 g. Adjust the workbench 24 to be horizontal, install the first outer detection cylinder 7 on the second fluid channel 4, open the drilling fluid inlet valve 26, and circulate the drilling fluid in the first annular space 41 for 10 minutes, then remove the second An outer detection cylinder 7 was weighed to obtain 1452.1g. Then install the first outer detection cylinder 7 on the second fluid channel 4, configure 500ml of ordinary MS flushing solution, adjust the piston pump 25, control the flow rate in the pipeline 27 to 0.5m / s, pump pressure 0.1MPa, rinse for 7min, and take out Weigh 1333.2g, install it back on the second fluid channel 4, control the flow velocity in the tube to 0.5m / s, pump the pressure to 0.1MPa, rinse for 3min, take it out and weigh 1321.5g. According to the formula, the flushing efficiency of the flushing liquid within 10 minutes is: (1452.1-1321.5) / (1452.1-123...

example 2

[0059] The same or similar to the method in Embodiment 1, the workbench 24 is adjusted to be horizontal, and the first mass is 1232.5g, and the second mass is 1455.2g. Configure 500ml of ordinary MS flushing solution, control the flow rate in the pipeline 27 to 1.5m / s, pump pressure to 0.15MPa, rinse for 7min, take it out and weigh 1290.2g, after installation, control the flow velocity in the pipeline 27 to 1.5m / s, and the pump pressure to 0.15MPa, Rinse for 3 minutes, take out and weigh 1275.8g, the rinsing efficiency of the rinsing solution within 10 minutes is: (1455.2-1275.8) / (1455.2-1232.5)=80.6%, and an obvious oil film can be seen on the inner wall of the detection cylinder. The overall evaluation is: MS flushing fluid has poor flushing effect on oil-based mud under turbulent flow conditions.

example 3

[0061] The same or similar to the method in Embodiment 1, the workbench 24 is adjusted to be horizontal, and the first mass is 1233.9 g, and the second mass is 1456.2 g. Configure 500ml of SCW flooding flushing fluid, control the flow rate in the pipeline 27 to 0.5m / s, pump pressure to 0.15MPa, rinse for 7 minutes, take it out and weigh 1250.2g, after installation, control the flow velocity in the pipeline 27 to 0.5m / s, and the pump pressure to 0.15MPa , rinsed for 3 minutes, took out and weighed 1241.2g. Therefore, the flushing efficiency of the flushing liquid within 10 minutes is: (1456.2-1241.2) / (1456.2-1233.9)=96.7%, and no obvious oil film is seen on the inner wall of the detection cylinder. The overall evaluation is: SCW flushing fluid has a good flushing effect on oil-based mud under laminar flow conditions, and has a good oil displacement effect.

[0062] It can be seen from the above three embodiments that the device and method of the present invention can truly sim...

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Abstract

The invention provides a device and method used for evaluating flushing liquid. The device comprises a drilling liquid box, a flushing liquid box, a first fluid channel, a second annular fluid channel and an evaluation unit, wherein the first fluid channel is selectively communicated with the drilling liquid box and the flushing liquid box, the second annular fluid channel comprises a first annular space part formed by a first inner detecting barrel and a first outer detecting barrel arranged outside the first inner detecting sleeve in a sleeving mode, one end of the second fluid channel is communicated with the first fluid channel, the other end of the second fluid channel is selectively communicated with the drilling liquid box and the flushing liquid box, and the evaluating unit is used for evaluating the performance of flushing liquid according to the quality of the first annular space part generated before and after drilling liquid flows and the quality of the first annular space part generated after the flushing liquid flows. Due to the arrangement, the underground environmental condition can be simulated more really, and flushing efficiency of the flushing liquid is improved. Therefore, evaluation of a flushing technology can be carried out easily, and the well cementation quality is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a device and method for evaluating flushing fluid. Background technique [0002] At present, oil-based mud is used to drill production layers in shale gas development, and the oil film formed by oil-based mud on the borehole wall affects the cement stone and formation quality. Low efficiency reduces the quality of cementing and affects the overall sealing effect of the annulus. [0003] High-efficiency flushing fluid technology is one of the key technologies to improve the quality of shale gas cementing. The use of a reasonable flushing fluid system and effective flushing process can effectively improve the cementing quality. However, in the process of well cementing construction, there are many factors affecting the flushing effect of flushing fluid, such as: well body quality, well deviation, borehole size, mud performance, construction displa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B49/08
Inventor 张明昌陶谦刘伟刘建汪晓静刘学鹏周体秋
Owner CHINA PETROLEUM & CHEM CORP