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Subterranean well and formation treatment

a technology of formation treatment and subterranean wells, applied in the direction of fluid removal, borehole/well accessories, construction, etc., can solve the problems of virtually untreated least permeable formation strata, adverse treatment effects, etc., and achieve the effect of high strength structur

Inactive Publication Date: 2018-04-12
LYONDELLBASELL ADVANCED POLYMERS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text discusses the use of a high strength structure made of a polymetaphosphate composition in well tools. The structure can be used to temporarily seal a perforation for a fracturing treatment, or to selectively prevent flow through a flow path in a well tool. The text also describes a method for constructing a downhole well tool by forming a solid mass made of polymetaphosphate and incorporating it into the well tool. These advancements can improve well tools and operations.

Problems solved by technology

Although high fluid permeability is an important characteristic of a hydrocarbon-producing formation, these treatments may be adversely effected by loss of treating fluid into the formations.
For example, in an acidizing treatment it is desired to treat the least permeable formation to improve its permeability; however, the formation strata having the highest permeability will most likely consume a major portion of the treatment fluid leaving the least permeable formation strata virtually untreated.

Method used

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  • Subterranean well and formation treatment
  • Subterranean well and formation treatment
  • Subterranean well and formation treatment

Examples

Experimental program
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example 1

[0109]Approximately 100 gram samples are prepared in accordance with polymetaphosphate composition formula 1 wherein X is sodium and M is calcium or magnesium, respectively. The samples are each prepared by mixing together sufficient powdered sodium phosphate dehydrate dibasic, ammonium phosphatedibasic and either calcium of magnesium oxide in accordance with formula 1 in amounts sufficient to yield approximately 100 grams of polymetaphosphate. The samples are well blended and poured into a crucible (part number C42, 4.2″ top diameter, 6.45 in height, available from Sundance Art Glass, 6052 Foster Rd, Paradise, Calif. 95969). The crucible is left uncovered and placed into a high temperature ceramic kiln. The mixture is heated within the crucible at 260° C. per hour to about 800° C. The individual sample is held at about 800° C. for about one hour after which the furnace is turned off and the sample permitted to cool to room temperature without forced cooling. The sample then is remo...

example 2

[0111]Samples are prepared and tested as in Example 1 utilizing the composition formula 2 wherein X is sodium and M is calcium and magnesium, respectively. The results of the dissolution tests of the individual samples are shown in FIGS. 7 and 8. Surprisingly, the composition utilizing magnesium exhibits a lower solubility rate in both examples than the composition utilizing calcium.

[0112]The following are additional enumerated embodiments of the concepts disclosed herein.

[0113]A first embodiment which is a method of plugging the perforations in a casing which has been set in a wellbore which penetrates a subterranean formation comprising: flowing down said casing a wellbore fluid having dispersed therein a plurality of substantially spherical high strength degradable compositions being sized to seal said perforations and being comprised of polymetaphosphates of the formula

AXH2P04.2H20+BMO+2(NH4)2HP04->(1 / n)[XM(P03)3]n+ammonia+water

wherein A and B are numbers of moles of reactants a...

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Abstract

a. A polymetaphosphate composition and method for temporarily sealing a well formation in a wellbore to facilitate a treatment therein and a well tool which can include a flow path, and a flow blocking device which selectively prevents flow through the flow path. The well tool can include a polymetaphosphate composition. A method of constructing a downhole well tool can include forming a structure of a solid mass comprising a polymetaphosphate composition, and incorporating the structure into the well tool.

Description

[0001]This application is a continuation of U.S. Ser. No. 14 / 919,413, filed Oct. 21, 2015, and which claims priority to U.S. provisional application U.S. Ser. No. 62 / 070,343, filed Aug. 21, 2014, the entire disclosure of which is incorporated by reference herein.FIELD OF THE INVENTION[0002]This disclosure relates generally to apparatus utilized and operations performed in conjunction with a subterranean well and, in an embodiment described below, more particularly provides high strength dissolvable compositions for use in a subterranean well.BACKGROUND OF THE INVENTION[0003]At various times during the life of a well in a subterranean formation it is desirable to treat the well. Such treatments can include perforating, gravel packing, fracturing, and acidizing. These treatments generally involve filling the wellbore with a standing or circulating treatment fluid. Although high fluid permeability is an important characteristic of a hydrocarbon-producing formation, these treatments may...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B34/06E21B43/04E21B33/134C09K8/50E21B33/138E21B34/00
CPCE21B2034/002E21B33/134E21B34/063C09K8/50E21B33/138E21B2034/005E21B43/04C09K8/516E21B2200/05E21B2200/04
Inventor TODD, BRADLEY L.HEATH, STANLEY J.
Owner LYONDELLBASELL ADVANCED POLYMERS INC
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