Methods for controlling screenouts

A filter screen and filter cake technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems such as uncertainty of the terminal screen

Inactive Publication Date: 2005-07-13
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Since the true nature of the formation is unknown and variable, the ability to successfully obtain terminal screens is largely uncertain

Method used

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  • Methods for controlling screenouts
  • Methods for controlling screenouts
  • Methods for controlling screenouts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Table 1

[0071] Working parameters

no fiber

fiber

half-length of the supported fissure

(feet)

101.1

77.1

The width of the wellbore being supported (in

Inch)

0.348

0.497

average supported width

0.235

0.375

Net pressure at the end of the job

649

1033

efficiency

0.509

0.533

Effective Conductivity (mD-ft)

1256

1947

[0072] Table 2

[0073] It can be seen that by adding fibers, the slit is shorter, wider and more conductive. By employing fibers, fluid efficiency is increased, which reflects the amount of proppant placed with a given amount of carrier fluid. If there is no fiber, then at 99 feet proppant is packed after 15 barrels of stage 6 have been pumped. Proppant is packed at 76 feet, if fiber, after 22 barrels of stage 4 have been pumped.

Embodiment 2

[0075] parameters

[0076] table 3

[0077] to run

[0078] Table 4

Embodiment 3

[0080] image 3 Some laboratory experiments are shown to illustrate the method of the present invention utilizing two fluid loss control additive cracker (cake degrader) stages. These are fluid loss experiments using the same method as in Example 1 at 52°C. It can be seen that in Experiment 1, when the first half contained the fluid loss control additive, the first splitting agent, and the splitting agent adjuvant (filter cake degrader adjuvant) for the second splitting agent present in the second half While still having the fluid loss control additive in the second half, there was no increase in fluid loss in the second half. In Experiment 2, when the first half was the same as in Experiment 1, but the second half contained no fluid loss control additive, the amount of fluid loss was significantly increased in the second half, indicating that the filter cake had been Serious destruction. In fracturing, this translates into bridging and / or reduced fluid efficiency and end s...

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Abstract

Methods are presented to induce a screenout during a subterranean formation fracturing or combined fracturing and gravel packing treatment by laying down a filter cake early in the treatment, then injecting proppant slurry, and then while proppant slurry injection continues chemically damaging the filter cake with one or more filter cake degradation agents, and optional filter cake degradation agent aids, so that leak-off increases, the concentration of proppant in the fracture increases, and the proppant screens out. The additional use of bridging-promoting materials, alone or in conjunction with filter cake degradation, is included.

Description

technical field [0001] The present invention relates to increasing the flow of fluids into or out of a subterranean well. More specifically, the present invention relates to facilitating the flow of fluids from a rock formation into a wellbore. In particular, the present invention relates to methods for performing fracturing and gravel during hydraulic fracturing (conventional or utilizing coiled tube), during subsequent fracturing followed by gravel packing, or in one operation. The method of controlling the size, shape, position and quality of the cracks formed during the filling process. Background technique [0002] Hydraulic fracturing, gravel packing, or the combination of fracturing and gravel packing in one operation, are widely used to facilitate the recovery of hydrocarbons, water, or other fluids from a formation. These operations involve pumping "proppant" slurries (natural or synthetic materials used to prop up fractures after they have formed) during hydrauli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/62C09K8/70C09K8/74C09K8/80
CPCC09K8/68C09K8/52C09K8/703C09K2208/08C09K8/80
Inventor 柯蒂斯·L·博尼迪安·威尔伯格马修·J·米勒
Owner PRAD RES & DEV LTD
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