BR112020006237A2 - seal liner for a borehole - Google Patents

Abstract

A sealing liner for a well hole having a side wall on which one or more nozzles are formed, is described, in which the one or more nozzles are plugged by temporary plugs. Also described is a method of completing an open borehole that penetrates an underground formation in which a seal liner having a side wall in which one or more nozzles are formed, in which the one or more nozzles are plugged by temporary plugs, is deployed in the well such that the nozzles communicate with the formation.

Description

Descriptive Report of the Invention Patent for "SEALING COATING FOR A WELL HOLE".

[0001] The present invention relates to sealing linings for well holes. The present invention is also directed to a well completion method for displacing non-aqueous to aqueous fluid using temporary plugged nozzles.

Background

[0002] Oil well instabilities and resulting production losses have been studied, and methods to limit and reduce such losses have been previously taught. These methods were applied to oil wells.

[0003] European Patent No. 2,253,798 to Nguyen (“Nguyen”) teaches a method of stimulating the production flow of a formation. The method includes placing an acidic fluid in the formation area to be stimulated to partially dissolve a portion of the formation area. The application discusses the types of acids to be used for this process, and specifically states that aqueous acid bases are best suited Once the formation has been degraded (to a degree), a consolidation fluid is then injected into the formation. The consolidation fluid is chosen from a type of bonding fluid, such as composites, taching agents, and other fluids that cause agglomeration of fine solid particles. The next step includes washing the area with a fluid to remove the agglomerated materials. The washing fluid can be fresh water. Additional steps involve placing a fracturing fluid in the area of the underground formation to create, or at least extend, a fracture in it.

[0004] US Patent Application No. 2014/0224807 to Ramon (“Ramon”) teaches a buffer arrangement in which the buffer is configured to conduct, or follow a hardenable material (such as cement) that is being pumped through a tubular body. The buffer includes one or more portions that are configured to weaken when exposed to an activation fluid. The material in this example is a controlled electrolytic metallic material. The plug additionally includes a plurality of plugs nested within each other, in which the main plug is in sealing engagement with the walls of a tubular body. The activation fluid used for the degradation of the electrolytic material can include brine, acid, and aqueous fluid, or combinations thereof. The nested plug may also include a hole, to allow the activation fluid to penetrate and effectively reach the main plug. The weakening of the buffer portions specifically includes dissolving one or more of the portions.

[0005] U.S Patent No. 3,924,677 to Prenner et al. ("Prenner") teaches a device used to complete an oil well. The device is a conduit that extends through the side wall of a well liner. The conduit is held in a retracted position on the side wall from from the inside of the liner by a friction sleeve formed of PVC. The opposite end of the duct is shielded, to a degree, from the external environment by a sacrificial dome body. The duct ends are sealed with salt stops that are shielded from fluids. Once the liner has been immersed to the required depth, and the cement plug has been formed, the outer protective dome (formed of cast iron) is manually broken to expose the salt stops inside the conduit bore. The lining is rubbed, which will cause the salt plugs to dissolve to open the limb on both sides. The passage between the layer and the inside of the well lining will then be possible.

[0006] Aviles et. al ("Dissolvable Buffer and Perf system eliminated mills-out in multistage stimulations”; AVILES, Isaac; DARDIS, Miguel; JACOB, Gregoire; Society of Petroleum Engineers, Journal of

Petroleum Technology, June 2015; "ALVIES”), teaches a plug and nozzle arrangement for plugging and drilling a well hole seal liner in which the plug seat is dissolvable. The new approach replaces mechanical intervention to remove the plugs. which seat assemblies serve the proposed caps, and dissolve in a controlled manner after stimulation has been carried out. This process will release the sphere and leave a total bore bore. Additionally, the development teaches a seat to fall additional to seal the nozzle. The seat corresponds to the geometry of the receptacle to create a metal-to-metal seal. A sphere is then launched from the surface to the earth at the seat, and completes the isolation of the anterior zones. - des are dissolvable, allowing immediate production.

[0007] U.S Patent No. 9,151,143 to Holderman et al. ("Hollandman") teaches a dissolvable sacrifice buffer. The buffer is used in series with a flow restrictor that is arranged in a fluid path between the outside of a well hole and the inside of the well hole. - ç. The buffer is configured to be at least partially dissolvable when contacted by a fluid.The fluid comprises a chemical configured to dissolve the buffer.

[0008] U.S. Patent No. 9,068,429 to Mailand et al. ("Mailand") teaches a dissolvable tool that is formed as a body that includes at least a portion of it that is configured to dissolve in a fluid. The body includes a barrier and the body is able to move through a structure preferably a duct The body (and barrier) seals the duct as the body moves through it. Common techniques for removing such a seal plug include grinding or perforating the plug.

[0009] Returning to Prenner which reveals a combination of a mechanical and non-intervention technique for removing a tampon.

A solid and a salt plug are housed within a translucent member in a protective coating. The hollow nature of the member is protected from future cementation operations by being solid on the side closest to the inner diameter of the protective coating, and having a salt plug on the opposite side. The sliding member is extended from the protective liner to the well bore by means of pressure and then cemented in place. After cementation, the solid plug inside the cast member is removed by mechanical means with a well hole assembly including a drill bit unfolded within the liner. The salt plug inside the empty member is then exposed to a fluid, which results in the dissolution of the salt plug to occur leaving a hollow conduit that connects the inner side of the liner with the well hole through the cement. This then allows flow to flow from the well bore through the hollow member extended in the conduit. The use of fluids to dissolve a buffer is therefore known. Prenner does not disclose the use of temporary plugs unfolded inside nozzles within the side walls of a sealing coating that does not extend to the well bore.

[0010] Aviles teaches a dissolvable object placed in the path of a conduit. Aviles 'revelation differs from the previously quoted request in that the cap' itself is not dissolved, but instead the seat where the 'cap' (sphere) is located dissolves. The order provides an alternative approach to non-obstructing a flow path through a conduit for dissolving the flow restrictor.

[0011] Mailand teaches a body that includes a dissolvable portion, and a barrier portion. The barrier portion being in a sealing engagement with the interior of a conduit. Similar to Aviles, a portion of the flow restriction object is dissolvable in order to provide flow passage through a conduit.

[0012] Returning to Holderman, his disclosure teaches a sieve set with a sacrifice plug placed on a side wall of a flue, and together with a flow restrictor that operates in series for the sacrifice plug . The sacrifice plug is dissolvable when contacted with a chemical fluid, to provide passage between the inside and outside of a well bore (through the side wall, flow restrictor, and sieve assembly). Holderman does not disclose the use of plugs in combination with nozzles that extend through the side walls of a sealing coating. Holderman also does not reveal the dissolution of the buffer without the use of Chemicals. Holderman does not disclose the use of dissolvable plugs without the use of a sieve set.

Summary of the invention

[0013] The present application teaches a process for removing temporary plugs, seated in nozzles, in a sealant coating. The process is referred to as free intervention, which means physical intervention (such as blasting or shooting hardened steel projectiles) is not used.

[0014] The current methods include the unfolding of an operating rod followed by the unfolding of a pre-drilled sealing liner to the final position. Pre-drilling the sealant liner is very specific, and requires a lot of time. Additionally, the process requires an internal stem to be unfolded.

[0015] The current order seeks to overcome the need for an operating rod and an internal rod to move the plugged nozzles.

[0016] In order to achieve one or more of these objectives, the present invention provides a sealing coating for a well hole having a side wall on which one or more nozzles are formed, in which the one or more nozzles are formed. plugged by temporary plugs. A sealing coating in the sense of this invention is therefore

well bore equipment, especially oil well bore equipment.

Such a sealing coating can act as a tube and form a conduit.

A side wall or jacket of the sealing liner is thus the side wall of a tube or conduit, and has a proximal end and a distal end, such that means can be transported through the sealing liner from the outside. - proximal tremor to the distal end, and / or vice versa.

Temporary plugs are preferably removable by using a buffering medium that dissolves under exposure to elevated temperature and / or an activation fluid, preferably an aqueous fluid.

A buffering medium that dissolves in an activation fluid and especially in an aqueous fluid can, for example, be a salt.

In an alternative preferred embodiment, temporary plugs are mechanical plugs that are removable by applying pressure cycles.

It is further preferred that the seal liner of the invention comprises a top seal plug seal that insulates the top of the seal liner such that during operation, all fluid flow is through the nozzles.

It is also preferred that the sealing liner of the invention comprises a sealing liner shoe and a sealing liner shoe closing device, in which the sealing liner shoe closing device allows movement during displacement and subsequently isolates the shoe from the sealing lining.

In such a preferred embodiment, the sealing lining shoe closing device can be closed by timer-activated electronics, Radio Frequency Identification (RFID), pressure, flow, or any combination thereof.

Alternatively, it can be closed by mechanical means using either a glove mechanically activated by means of intervention, an arrow / ball released from the surface to mechanically isolate the shoe, or a combination of both.

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[0017] In order to achieve one or more of the aforementioned objectives, the present invention additionally provides a method of completing an open-bore well that penetrates an underground formation in which a seal coating having a side wall in which one or more nozzles are formed, in which the one or more nozzles are plugged by temporary plugs, is deployed in the well such that the nozzles communicate with the formation. It is preferred that a sealing liner closing valve is deployed to allow displacement of initial fluid through the sealing liner with plugged nozzles. It is further preferred that after positioning the seal liner, the temporary plugs are removed from the nozzles.

[0018] In order to achieve the aforementioned objectives, the request additionally teaches the use of temporary plugs that can be removed by non-physical means or free intervention methods. Isro is achieved by using a plug produced from a specific material or medium. The medium is finally dissolved, which provides production flow through the nozzle, which is no longer obstructed. The dissolution of the buffer is due to the nature of the medium and the exposure of this medium to the temperature or activation fluid (typically an aqueous fluid). A mechanical plug can be used, and removed by applying pressure cycles.

Brief description of the drawings

[0019] The present invention will be described with reference to the accompanying drawings of which:

[0020] Fig. 1 shows a Drawing of Base Coating Well with standard nozzles in sealing coating;

[0021] Fig. 2 shows a Drawing of Base Coating Well showing displacement rod required for displacement of non-aqueous fluid to aqueous fluid.

[0022] Fig. 3 shows the progression of the base coat design (left embodiment) for embodiments according to the present invention (internediary and right embodiment). Detailed description of the invention

[0023] The invention relates to the field of oil well drilling and, more particularly, the completion of well and seal coatings to achieve such completion. The process in which the sealing coating of the invention can be advantageously isolated, preferably involves providing a pre-punctured sealing coating having plugged nozzles extending through the punched holes. Once the sealing liner is in place, the temporary plugs allow displacement of the bore and well from non-aqueous fluid to aqueous fluid. Then the plugs are removed from the nozzles to provide unobstructed production and injection flow.

[0024] The present invention thus teaches in a preferred embodiment a method of completing an open borehole that penetrates an underground formation to control the production of oil and injection of acidizing fluid to the formation. The well is provided with nozzles that extend through the sealing coating and communicate with the formation. The nozzles provide a negligible pressure drop in a steady-state production scenario, whereas in a high-rate injection scenario a sufficient pressure drop is achieved to allow uniform distribution of injection fluids. Temporary plugs are located in the throat of the nozzle such that initially the nozzles act as an empty piece of pipe. A sealing liner closing valve is deployed to allow displacement of initial fluid through the sealing liner with plugged nozzles. The sealing liner with temporary plugs is deployed in the well in a non-

aqueous. Temporary plugs in conjunction with other components allow displacement of non-aqueous fluids through the liner / seal liner during deployment to assist in reaching final placement depth. Once the sealing liner is in place, the temporary plugs allow displacement of the well hole from non-aqueous fluid to aqueous fluid. Then, the temporary plugs are removed from the nozzles to provide unobstructed production and injection flow path for formation, and unobstructed liners / seal liners for future intervention. Temporary plugs can be removed by a variety of intervention-free methods such as: dissolved temperature materials, materials dissolved in aqueous fluid, pressure actuated valves. Subsequent to the aqueous fluid displacement operations, a closed valve isolates the shoe and ensures all future production and injection of fluids that pass through the nozzles once the temporary buffering mechanism is removed. A top plug of the retained actuated seal liner is adjusted once the aqueous fluid displacement operation is complete.

[0025] Current methods for displacing the pre-perforated sealing liner from non-aqueous fluid to aqueous fluid typically requires unfolding an operating rod after unfolding the pre-perforated seal liner to final position. Such methods require significant operating time to control the operating rod within the drill rig structure and for physical deployment.

[0026] The pre-perforation of the sealing liner is very specific and performed such that it provides negligible pressure drop in a constant state production scenario, whereas in a high transient rate injection scenario, sufficient pressure drop is achieved to allow uniform distribution of injection fluids.

[0027] Alternate methods for the same displacement operation are to unfold the operating rod as an internal rod within the pre-drilled seal liner. This method is not applicable in extended reach applications due to the higher weight of the sealing coating, which negates the ability to unfold to the final position through increased drag.

[0028] The method according to the present invention enables the displacement operation to take place through the pre-perforated sealing coating without the subsequent operation rod unfolding operation, nor the use of an internal rod.

[0029] Preferred components that produce this reachable method are described below:

[0030] Top plug of the sealing lining with delayed activation (until after the aqueous fluid is detached). Once seated, this plug isolates the top of the seal liner ensuring that all fluid flow is through the nozzles.

[0031] Device for closing the sealing lining shoe that allows circulation during displacement operations and subsequently isolates the dapata for the life of the well. Once isolated, all fluid flow is through the nozzles. The device can be operated closed by the electronics activated by stopwatch, RFID, pressure or flow. Alternatively, a device that is closed by mechanical means using pressure, arrow / sphere actuation, or a combination of both.

[0032] Temporary plugged nozzles that are removed once the aqueous fluid displacement operations are completed. Temporary buffers can be removed by using a buffering medium that is dissolved with time and exposure to temperature and / or an activation fluid (typically an aqueous fluid), or a buffer

mechanical bread that is removed by applying pressure cycles. Temporary plugs must be designed to withstand differential pressure generated by displacement operations through the device, and provide sufficient time delay before removal to complete the device.

[0033] A number of different temporary buffers can be used to execute the aforementioned method. Temporary buffers can be removed by using a buffering medium that is dissolved over time and exposure to temperature and / or an activation fluid (typically an aqueous fluid), or a mechanical buffer that is removed by applying cycles of pressure. Buffers would be required to withstand adequate differential pressure to allow displacement of non-aqueous fluid with high-rate aqueous fluid. If a temperature dissolution method or activation fluid is used, sufficient delay is required to enable the sealing coating to unfold in an extended reach application.

[0034] The described method provides significant operational time and cost savings over the historical method. In addition, the described method allows the pre-drilled seal liner to be washed, floated and / or bored to full depth in extended reach applications. The nature of the temporary buffering of the nozzles in conjunction with the closed shoe and top of the seal liner 10 may also allow the seal liner to be used as a tested barrier for superior completion operations.

Claims (10)

1. "Sealing liner for a well hole having a side wall in which one or more nozzles are formed, characterized by the fact that the one or more nozzles are plugged by temporary plugs. 2. The sealing coating, according to claim 1, characterized by the fact that the temporary plugs are removable by using a buffering medium that dissolves after exposure to high temperature and / or an activation fluid preferably an aqueous fluid. 3. "The sealing coating, according to claim 1, characterized by the fact that the temporary plugs are mechanical plugs that are removable by applying pressure cycles. 4. The sealing coating according to any one of claims 1 to 3, characterized by the fact that it comprises a top plug of the sealing coating that isolates the top of the sealing coating, such that during operation, all fluid flow is through of nozzles. The sealing coating according to any one of claims 1 to 4, characterized in that it comprises a sealing coating shoe and a sealing coating shoe closing device, in which the sealing shoe closing device sealing lining allows circulation during displacement operations and subsequently isolates the shoe from the sealing lining. 6. The sealing lining, according to claim 5, characterized by the fact that the sealing lining closure device can be closed by electronics activated by timer, RFID, pressure or flow. 7. The sealing lining according to claim 5, characterized by the fact that the sealing lining shoe closing device can be closed by mechanical means using pressure, arrow / ball actuation, or a combination of am - bos. 8. “A method of completing an open borehole that penetrates an underground formation in which a seal liner having a side wall in which one or more nozzles are formed, characterized by the fact that the one or more nozzles are plugged by temporary plugs , is deployed in the well such that the nozzles communicate with the formation. 9. The method according to claim 8, characterized by the fact that a valve for closing the seal liner shoe is deployed to allow displacement of initial fluid through the seal liner with plugged nozzles. 10. The method according to claim 8 or 9, characterized by the fact that after positioning the sealing coating, the temporary plugs are removed from the nozzles. al "8 8 | E ê 3 3" za El 8 2 P E 8 8 3 all |: É & 3 £ O 8 Ê o— o a 2: iu sil S 2 is É dd & 2º FE 3 SE ss 3) E We s à 8 & g> Le s | 3 s 8 | S% i 2 & ms | 284 é k FP 3 1) «E à É; f [x |] - 2nd o ss | € EE 3) z 5th A to Z = o ns J À E E À 2 <ã ã é Ez It's' 8 | ê j x AND E & Ss AND IT IS S 8 2 & 8 z 3 Si e e <O É (mis Fox o I / O>> vo o ash) PE SSRABEE: E / l- 8 5 2 = 4 E S &> À 8 À = | - x ã E o E 8 C & = AS to 3 8 Og 3). 2 F o E = 2) 2 5 L s a | es g = 8 | 2 HI LS) Ê õ Ha 8) ê gs S õ Ê E) 2 | S ES & 8 = 3 à + E) E A ê ã z & e Ê | Z 2 1 o S / F. 5 OS E> Is x or NY 8 S o x Ss AY Fr DOS DX 3 É $ ã ê Ss e 3 a> e <z 3 Ss v É 3 <E5 E & ai E5o à Ss Po ã = as 8 E. = es Er ê à, ê 2 sas = É ê see sa - SE <TE | E 3 and 3 235 SE IS 883 | E õ IF E 2> 8 6 Ss 3 BE E 382 Is healthy 2 Es% To) => a 2 E 2 2 ã Es> ss 3 oe & 538 o 8 õ or &: t; ]: 8% o E si T EM &) fos x e "7 - |:: * SR" v se. | => <o o o 1 48 are 5> Tas STE rm; 85 p Bo Ss mo 2 z P á 8 2 - ees 2 & Í É Ê aq 8 5 E a <8 à, 8> ê e & QL2X% X Re oe> vo oo É 2 EB & PE E flight S a 5 A . Ss 58 & S 2 3 ESC ESC Ss S BE E ES To ss> z ES 28 & Se 3% S ES & ss 533 3%. = 3rd $ SEL 23 $$ u z; 8ê EPs FROM> ú Ed o € É SP; d £ Po 7 T> | S Bs 2º O i SÉ "- ES EEE EE ETTA WE TEN TIE is FF VE ET E ves 1 | À ã sa a. Va V À ê az Pr P E S.); ae ENE EEN ETA 3: e e | EE DI 1 1 Ê 8: 28 Ú: Ven e gs 2 S: o 2 8 8: à Z $ $: 8 ã í - &:: 2 4 "2:: 8 ã F & Ê É 3 = o É 88 S $:: SE 3 seo É E oe es ê se í é & 8233 Sg o Sã É $ i E8 YT BE 4 38 É Ss S o e $ i as E 3 5 E E & sz Ê Es sz ES o SB 8 2nd> ee 3 are z EE 83 ã & Z a postpones ”E - T == ã Sos á;;» ': Be T -— À oe | vs - Fr: o = |] Ss so DE O | &