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Device for evaluating sand-blocking performance of sieve with sieve tube

An evaluation device and screen technology, applied in the field of analog measurement, can solve the problems of oil and gas wells such as irreversible damage, gas flow reduction, well wall collapse, etc., and achieve the effect of improving sand control efficiency and working life

Inactive Publication Date: 2010-10-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The harm of sand production in oil and gas wells to oil and gas well production is mainly reflected in three aspects: (1) formation sand accelerates the abrasion of downhole and surface pipe strings and equipment during the process of flowing with oil and gas, especially downhole safety valves and wellhead devices, The replacement and maintenance of these equipments is costly and wastes production time; (2) After the formation sand is produced, if the fluid velocity at the bottom of the well is not enough to take it out, the formation sand will settle at the bottom of the well and gradually bury the oil layer, making the surface The airflow obtained becomes smaller, and production can only be resumed by circulating sand washing or sand fishing; (3) formation cavities may be formed if severe sand production occurs, causing the casing and the mud shale interlayer in the formation to lose support, and in severe cases may also cause Well wall collapse causing irreversible damage to oil and gas wells

Method used

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  • Device for evaluating sand-blocking performance of sieve with sieve tube
  • Device for evaluating sand-blocking performance of sieve with sieve tube
  • Device for evaluating sand-blocking performance of sieve with sieve tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The simulated stratum of simulated borehole surrounding rock stratum was prepared by mixing the finished sand and bentonite. The shale content of the simulated stratum was 12.5%, the separation coefficient was 5, and the median sand grain size of the simulated stratum was 0.15mm. The sand control screen screen mesh combination to be evaluated is 80μm+120μm. The inventive device is assembled, and the hydraulic power unit provides a simulated differential pressure of 3Mpa to the cylinder. The pressures at the upper, middle and lower positions in the cylinder body 102 are 3Mpa, 2.25MPa, and 1.5MPa respectively; the fluid flow through the sand control screen to be evaluated is 0.05L / s, and the simulated formation sand output is 25.721g (collected time 95s). image 3 It shows that the screen of the sand control screen is generally clogged, and the data shows that the screen of the sand control screen is well compatible with the working environment.

Embodiment 2

[0024] The simulated stratum of simulated wellbore surrounding rock stratum was prepared by mixing finished sand and bentonite. The shale content of the simulated stratum was 5%, the separation coefficient was 8, and the median sand grain size of the simulated stratum was 0.20mm. The sand control screen screen mesh combination to be evaluated is 80μm+120μm. The inventive device is assembled, and the hydraulic power unit provides a simulated differential pressure of 5Mpa to the cylinder. The pressures at the upper, middle and lower positions in the cylinder body 102 are 5Mpa, 3.5MPa, and 1.3MPa respectively; the fluid flow through the sand control screen to be evaluated is 0.04L / s, and the simulated formation sand output is 45.31g (collected time 95s). Figure 4 It shows that the screen of the sand control screen is seriously blocked, and the data shows that the screen of the sand control screen is not compatible with the working environment.

Embodiment 3

[0026] The simulated stratum of simulated wellbore surrounding rock stratum was prepared by mixing finished sand and bentonite. The shale content of the simulated stratum was 5%, the separation coefficient was 8, and the median sand grain size of the simulated stratum was 0.20mm. The combination of sand control screen screen mesh to be evaluated is 90μm+120μm. The inventive device is assembled, and the hydraulic power unit provides a simulated differential pressure of 5Mpa to the cylinder. The pressures at the upper, middle and lower positions in the cylinder body 102 are 5Mpa, 3.8MPa, and 1.7MPa respectively; the fluid flow through the sand control screen to be evaluated is 0.06L / s, and the simulated formation sand output is 23.37g (collected time 95s). The screen of the sand control screen is generally clogged, and the data shows that the screen of the sand control screen is well compatible with the working environment.

[0027] By using the evaluation method of the presen...

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Abstract

The invention relates to a method and a device for evaluating sand-blocking performance of a sieve with a sand-prevention sieve tube. The method comprises the following steps of: putting the sieve with the sand-prevention sieve tube to be evaluated on the lower part of a simulated formation which is used for simulating a well-bore surrounding rock formation in the evaluation device; pumping a high-pressure fluid into the device; performing data acquisition by using a flowmeter and a sand collecting bucket which are arranged at an outlet at the lower end of the evaluation device; and analyzing the acquired data to evaluate the sand-blocking performance of the sieve with the sand-prevention sieve tube. The evaluation device comprises a cylinder body (102), the simulated formation (101), a hydraulic power device (103), a pressure sensor (104-1) on the upper part of the cylinder body, a pressure sensor (104-2) on the middle part of the cylinder body, a pressure sensor (104-3) on the lower part of the cylinder body, the flowmeter (105), the sand collecting bucket (106), a data acquisition device (107) and the sieve (108) with the sand-prevention sieve tube to be evaluated. The method and the device can quickly evaluate the sand-blocking performance of the sieve with the sand-prevention sieve tube in different working environments, determine a suitable sieve combination with the sand-prevention sieve tube, and improve the sand prevention efficiency and prolong the service life of the sand-prevention sieve tube in an oil-gas well by simulating various oil-gas well working environments with different production pressure differences and different fluid types of the sand-prevention sieve tube.

Description

technical field [0001] The invention relates to the technical field of simulation measurement used in the oil and gas exploration and development process, in particular to a method and device for evaluating the sand-retaining performance of a sand control screen. Background technique [0002] Sand production in oil and gas wells is one of the important problems encountered in the process of oil extraction, which brings many potential dangers to oil field production and increases the cost of extraction. After decades of research, reasonable sand control has become the key to sand control technology - not only to prevent a large amount of sand production, but also to control a small amount of sand production in the formation; screen sand control is one of the most common sand control methods in the production of oil and gas wells. Due to different Screens with different specifications have different sand-retaining precision, and the evaluation of the main component in the scre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 金衍邱康陈勉
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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