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Oil-water well composite sand prevention method

A technology for oil and water wells and sand control, which is used in earth-moving drilling, wellbore/well components, sealing/packaging, etc., can solve problems such as inapplicability, and achieve the effects of long validity period, reduced operating costs, and high success rate

Inactive Publication Date: 2003-04-30
胜利油田方圆科工贸有限责任公司化工分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these patented technologies have their own strengths, they are not suitable for medium and deep wells over 1500 meters and low temperature wells at 40°C to 55°C, and are only suitable for sand control of a small number of oil and water wells.

Method used

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  • Oil-water well composite sand prevention method
  • Oil-water well composite sand prevention method
  • Oil-water well composite sand prevention method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: For the loose sandstone formation of cementation, earlier by directly pumping (squeezing) into the method for front fluid, utilize hydraulic impact energy, flush near wellbore zone; Carry a certain amount of film-coated sand (or other artificial sand) to make it accumulate in the cavities near the well wall; finally, the composite porogen is pumped in, and under its strengthening and consolidation effect, an artificial sand arch with high strength and high permeability is formed to achieve the purpose of sand control and production increase .

Embodiment 2

[0038] Example 2: For wells with serious reservoir pollution or dense cementation, chemical plugging removal, dissolution and mixed gas-water strong drainage, and pre-blockage removal fluid pretreatment measures are used to dredge the blockage near the wellbore and form a certain Cavities; and then use the energy of sand-carrying liquid to make the artificial sand form a high-permeability sand arch near the well wall, so as to achieve the purpose of sand control and increase production and injection.

Embodiment 3

[0039] Embodiment 3: For the very tight and sandy reservoir of cementation, first make the reservoir form artificial fractures by hydraulic fracturing; then pump the coated sand to fill between the fractures and blastholes, so that the previous radial flow becomes Straight line (the fluid first flows into the fracture, and then injects into the wellbore from the fracture); finally, under the action of the composite porogen, the sand wall consolidated in the fracture not only blocks the formation sand, but also improves the formation conductivity.

[0040] As shown in Figure 1, the construction process of the present invention is as follows in sequence: sand washing, drilling, casing pressure test, lowering sand control pipe string, installing wellhead device, sand control construction, shutting down the well and waiting for condensation, drilling sand washing, and resuming production . Among them, "sand control construction" is the core key process of the present invention, an...

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Abstract

The present invention discloses an oil-water well composite sand prevention method which is a special sand prevention technique using high-pressure filling chemical agent and artificial sand. Its main technical characteristics is that under the carrying action of large output volume chemical agent and water by high pressure pump, the film covering sand is pumped into the oil-water well void spaceor gap formed after pretreatment, then pumped in composite pore forming agent which can solidifying and strengthen the film covering sand and form multilayer sand preventing barrier with high strength and high permeability outside the wellhole, thereby achieves the aim of sand preventing and increase output and injection. Advantages: suitable for different kinds of oil wells, high success rate, long effective period.

Description

(1) Technical field [0001] The invention relates to a method for extracting oil, gas and water from wells in an oil field, and belongs to the technical field of sand control for oil and water wells, in particular to a composite sand control method for oil and water wells. (2) Background technology [0002] In oil extraction, sand production from oil and water wells is extremely harmful. If sand buries oil, gas, and water layers, the production of oil and gas wells will be stopped, and the injection of water wells will be stopped. Downhole operations, equipment maintenance or replacement will be frequent, and production costs will increase. If a large amount of sand is produced, the formation will be seriously deficient, and cavities will easily form outside the casing of the reservoir, causing formation collapse, casing rupture and deformation, and even the well being scrapped. Therefore, sand control for sand production wells is the primary measure to ensure the normal prod...

Claims

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Application Information

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IPC IPC(8): E21B33/10
Inventor 韩荣山李文生陈造峰孟维斌白明友李勇林王维刚隋广海
Owner 胜利油田方圆科工贸有限责任公司化工分公司
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