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Single slip soluble bridge plug

A single-slip, bridge-plug technology, applied in wellbore/well components, earthmoving, sealing/packing, etc., can solve the problems of reduced flowback efficiency, long double-slip bridge plug, easy to block wellbore, etc. , to achieve the effect of improving sealing reliability, improving flowback efficiency, and strong anchoring reliability

Pending Publication Date: 2019-07-30
FIVE STAR DOWNHOLE SERVICE INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the double-slip bridge plug in the prior art has a long length and a large volume, which is inconvenient for the bridge plug to be lowered; and the slip structure in the bridge plug in the prior art has poor fracture effect when setting, and the anchoring effect is not good. Reliable; in addition, after the completion of layered fracturing, the plugging of the bridge plug needs to be released. The drilling and grinding method is often used to wear off the bridge plug, but the processing process is cumbersome, and the remaining materials are easy to block the wellbore
In the prior art, soluble metal materials and soluble elastic materials are also used to make bridge plugs, but usually the materials are not completely dissolved, and the dissolution rate is slow, which cannot meet the needs of efficient construction, and the soluble materials in the prior art have low strength. In order to meet the strength requirements, the bridge plug can only be made with a small inner diameter, which greatly reduces the flowback efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The rapidly dissolving high-strength and high-elongation magnesium alloy described in this embodiment is composed of the following elements in mass percentage: Gd 2.5%, Y 1.0%, Al 1.0%, Zn 0.5%, Zr 0.4%, Sc 0.01%, Cu 1.5%, Li 0.25%, Ni 0.25%, Ga 0.25%, In 0.25%, and the rest is Mg.

[0085] The preparation method of the fast-dissolving high-strength and high-elongation magnesium alloy described in this embodiment, the specific steps are as follows:

[0086] S1. Weigh pure Mg, pure Al, pure Zn, pure Ga, pure In, Mg-Gd master alloy, Mg-Y master alloy, Mg-Zr master alloy, Mg-Sc master alloy, Mg- Cu master alloy, Mg-Li master alloy, Mg-Ni master alloy;

[0087] S2. Preheating the raw materials except pure Ga in step S1 at 150° C. for 2 hours;

[0088] S3. Mix all the raw materials, heat the mixed raw materials to 720°C in a crucible resistance furnace, melt for 30 minutes, add the first refining agent, refine for 30 minutes, remove the inclusions in the melt, and then use...

Embodiment 2

[0095] The fast-dissolving high-strength and high-elongation magnesium alloy described in this embodiment is composed of the following elements in mass percentage: Gd 1.5%, Y 0.5%, Al 0.1%, Zn 0.1%, Zr 0.2%, Sc 0.001%, Cu 0.1%, Li 0.01%, Ni 0.01%, Ga 0.01%, In 0.01%, and the rest is Mg.

[0096] The preparation method of the rapidly dissolving high-strength and high-elongation magnesium alloy described in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0098] The fast-dissolving high-strength and high-elongation magnesium alloy described in this embodiment is composed of the following elements in mass percentage: Gd 14.5%, Y 2.0%, Al 2.0%, Zn 1.0%, Zr 0.5%, Sc 0.02%, Cu 2.0%, Li 0.5%, Ni 0.5%, Ga 0.5%, In 0.5%, and the rest is Mg.

[0099] The preparation method of the fast-dissolving high-strength and high-elongation magnesium alloy described in this example is the same as that in Example 1.

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Abstract

The invention provides a single slip soluble bridge plug. The single slip soluble bridge plug includes a central pipe, wherein an upper joint, a rubber cylinder, a cone, a slip mechanism and a lower joint are sequentially arranged on the central pipe in a sleeving mode, and the upper joint, the rubber cylinder, the cone and the slip mechanism can slide in the axial direction of the central pipe; the upper joint is connected with the central pipe through a shear pin; the small diameter end of the cone is inserted into a gap between the slip mechanism and the central pipe; the slip mechanism includes a first slip tooth and a second slip tooth, the tip of the first slip tooth inclines towards one side of the upper joint, and the tip of the second slip tooth inclines towards one side of the lower joint; and the central pipe, the upper joint, the lower joint, the cone and the slip mechanism are made of soluble metal materials, and the rubber cylinder is made of a soluble elastic material. The single slip soluble bridge plug adopts a single slip structure, is shorter in length, small in size, the bridge plug goes down conveniently when plugging, and anchoring reliability is high; and after stratified fracturing is completed, the single slip soluble bridge plug can be dissolved by a flow back fluid, the dissolution rate is fast, so that the full bore of a wellbore after fracturing canbe realized, and the flow back efficiency is enabled to be high.

Description

technical field [0001] The invention belongs to the technical field of tools for petroleum exploitation, and in particular relates to a single-slip soluble bridge plug. Background technique [0002] In oilfield exploration and development, it is necessary to seal the lower well section during the construction of oil and water wells in layered fracturing, layered acidification, and layered oil testing. Bridge plugs are commonly used in oil development. Safe, reliable, and low-cost downhole plugging tools . The bridge plugs in the prior art are mostly double-slip bridge plugs, including a central tube, the middle section of the central tube is sleeved with a rubber sleeve, and a cone is sleeved on each side of the rubber sleeve on the central tube, and then the two cones are respectively sleeved. One slip mechanism, the small-diameter ends of the two cones are inserted into the gap between the slip mechanism and the central tube, and then a joint is set on each of the two sli...

Claims

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Application Information

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IPC IPC(8): E21B33/134C22C23/06
CPCE21B33/134C22C23/06
Inventor 胡毅唐廷基罗传容高尚芳
Owner FIVE STAR DOWNHOLE SERVICE INC
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