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Sieving pipe sand preventing process

A technology of sand control and craftsmanship, applied in the field of sand control technology, can solve the problems of high platform transportation costs and limited platform work space, and achieve the effects of environmental protection, reduced construction procedures, and convenient construction

Active Publication Date: 2018-01-12
SOUTHWEST PETROLEUM UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Especially for offshore high-porosity and high-permeability reservoirs, due to the limited operating space of offshore platforms and the high cost of platform transportation, in order to reduce construction procedures and construction costs, the present invention proposes a screen-pipe sand control technology

Method used

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  • Sieving pipe sand preventing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 adopts the sand control experiment of not pressing open the rock slab.

[0043] The experimental temperature was 90°C.

[0044] In the first step, 3% NH is displaced from reverse drive inlet 2 4 The Cl base fluid simulates the flow from the formation to the bottom of the well during the production process, and the sand output is tested from the circulation cleaning outlet 3. Displace 3% NH from positive drive inlet 1 after reverse displacement 4 The Cl base fluid is used to clean the sand that sinks in the pipeline, and the amount of sand produced from the circulation cleaning outlet is also tested. Specifically, all the materials that flow out twice are filtered and then dried, weighed to take out the sand mass, and calculate the sand velocity. The test results are: the displacement pressure is 4MPa, and the sand output is 5.3g / h.

[0045] In the second step, agent B is displaced from the positive drive inlet under a displacement pressure of 4 MPa, and...

Embodiment 2

[0050] Embodiment 2 adopts the sand control experiment of pressing open rock slabs.

[0051] The experimental temperature was 90°C.

[0052] The first step is to displace 3%NH from the reverse drive inlet 4 The Cl base fluid simulates the flow from the formation to the bottom of the well during the production process, and the sand output is tested from the circulation cleaning outlet. Displace 3% NH from the positive drive inlet after the reverse drive is over 4 The Cl base fluid is used to clean the sand that sinks in the pipeline, and the amount of sand produced from the circulation cleaning outlet is also tested. Specifically, all the materials that flow out twice are filtered and then dried, weighed to take out the sand mass, and calculate the sand velocity. The test results are: the displacement pressure is 4MPa, and the sand output is 7.9g / h.

[0053] In the second step, the agent A is displaced from the positive drive inlet at a displacement pressure of 6 MPa, and t...

Embodiment 3

[0060] Embodiment 3 adopts the sand control experiment of not pressing open the rock slab.

[0061] The experimental temperature was 85°C.

[0062] The first step is to displace 3%NH from the reverse drive inlet 4 The Cl base fluid simulates the flow from the formation to the bottom of the well during the production process, and the sand output is tested from the circulation cleaning outlet. Displace 3% NH from the positive drive inlet after the reverse drive is over 4 The Cl base fluid is used to clean the sand that sinks in the pipeline, and the amount of sand produced from the circulation cleaning outlet is also tested. Specifically, all the materials that flow out twice are filtered and then dried, weighed to take out the sand mass, and calculate the sand velocity. The test results are: the displacement pressure is 5MPa, and the sand output is 4.8g / h.

[0063] In the second step, agent B is displaced from the positive drive inlet under a displacement pressure of 5 MPa,...

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Abstract

The invention discloses a sieving pipe sand preventing process. The sieving pipe sand preventing process comprises the steps that (1), well input fluid is prepared; (2), construction programs are selected: reservoir stratum non-pressing-open sieving pipe sand prevention is selected for wells with less output sand and wells with tubular columns which cannot bear high pressure, and reservoir stratumpressing-open sand prevention is selected for wells with serious cemented loose sand output, old wells and wells with tubular columns which can bear high pressure; (3), reservoir stratum non-pressing-open sieving pipe sand prevention is carried out: a dispersion system agent B is injected into a layer on which sand prevention is about to be carried out, displacement fluid is injected into shafts,pumping stopping and well shutting are carried out, and pressure building is carried out for 20 min to 30 min, pressure release is carried out, and circular well washing is carried out; and (4), reservoir stratum pressing-open sand prevention is carried out: fracturing fluid A is injected into the layer on which sand prevention is about to be carried out at pressure higher than formation fracturepressure, and a formation generates cracks, a dispersion system agent B is injected into the cracks, displacement fluid is injected into the shafts, pumping stopping and well shutting are carried out, pressure building is carried out for 30 min to 200 min, and pressure release and circular well washing are carried out. According to the process, construction risks and potential safety hazards areeffectively reduced, tubular column raising and inputting work is not needed, and construction is convenient, easy, safe and fast.

Description

technical field [0001] The invention relates to the sand control technology in the petroleum development process, in particular to a sand control technology through screen pipes. Background technique [0002] In high-permeability and high-porosity sandstone reservoirs, due to the low cement content and low cement strength, it is easy to cause sand production in oil wells; after the oil layer is drilled, due to the destruction of the original stress balance, the stress concentration of the rock near the wellbore wall, the wellbore wall The nearby rocks are prone to shear failure, which will cause sand production in oil wells; during the production process of oil wells, the formation pressure drops beyond the limit, causing plastic deformation of rocks, which will cause sand production in oil wells; crude oil has a certain viscosity, especially heavy oil to the bottom of the well. The inflow process will cause sand production in the formation; the change of the working system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/02E21B43/267C09K8/68
Inventor 赵立强刘义刚杜娟刘长龙兰夕堂孟祥海邹剑张丽平刘平礼李年银罗志锋符扬洋徐昆张璐皇扶杉
Owner SOUTHWEST PETROLEUM UNIV
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