MX2007015830A

MX2007015830A - Methods for preventing proppant carryover from fractures, and gravel-packed filters .

Info

Publication number: MX2007015830A
Application number: MX2007015830A
Authority: MX
Inventors: Elena Mikhailovna Pershikova; Evgeny Borisovich Barmatov; Konstantin Mikhailovich Lyapunov
Original assignee: Schlumberger Technology Bv
Priority date: 2006-12-28
Filing date: 2007-12-13
Publication date: 2008-10-28
Also published as: CA2763680A1; CA2763680C; CA2614114C; RU2006146962A; CA2614114A1; US20080156489A1

Abstract

This invention relates to the oil and gas industry, in particular, to methods affecting the formation productivity at the oil and gas production stage. A method for fracture propping in a subsurface layer, which ensures a reliable protection of wells from the proppant carryover from the fracture, has been proposed. According to the proposed method, a fracturing fluid is mixed with a propping agent and particulate binding material wherein the particles have an average length-to-width ratio of less than or equal to about 10; thereafter, a formation fracturing process is implemented. Then, the particulate binding material hardens and forms a homogenous firm mass with the propping agent, which impedes the closing of the fracture and precludes proppant carryover from the fracture.; Or, a fracturing fluid composition obtained by mixing a propping agent with a binding compound in the form of a powder whose size varies from about 1 to about 500 mum. A gravel-packed filter is then constructed; the said filter is based on the application of the working fluid comprising a propping filler and particulate binder with a length-to-width ratio of less than or equal to 10, or comprising a propping filler and a binding compound in the form of a powder with a size varying from about 1 to about 500 micrometers.

Description

METHODS FOR AVOIDING THE TRANSFER OF FRACTURE CONSOLIDATION, AND GRAVEL-PACKED FILTERS FIELD OF THE INVENTION This invention relates to the oil and gas industry, in particular, to methods that affect the productivity of the formations in the production stage of the process. oil and gas. BACKGROUND OF THE INVENTION A transfer of consolidation agent from a fracture to the well in the post-billing period either during the initial cleaning or sometimes even after the completion of the construction of the well is a crucial problem for the sector of the well. oil production. As practical experience shows, up to 20% of the consolidation agent could be transported to the well, which in turn, could lead to a number of negative consequences; Some of these are specified below. In marginal wells, the consolidating agent sits in a casing; therefore, regular washing is required and the cost of well repair operations increases. Premature wear and failure of submersible electric pumps is another consequence of the transfer of non-adhering consolidating agent or other solid rock particles. The reduction of oil and gas production is also observed due to a significant loss of near-well conductivity caused as a result of a reduced thickness of the fracture or overlap of a production zone. Currently several methods are known that allow a significant reduction in the transfer of consolidation agent or other consolidation agents from the fracture. The most widely used technique is based on the application of consolidation agent with a hardening resin coating (US 5218038), which is injected into the fracture at the end of the treatment process. However, the application of this consolidation agent has a number of notable restrictions, which are caused by casual chemical reactions of the resin coating with a stratum billing fluid. On the one hand, this interaction causes the partial degradation and disintegration of the coating, thereby reducing the contact force between the particles of the consolidating agent, and, therefore, reducing the strength of the consolidating agent package. On the other hand, the interaction between the components of the resin coating and the components of the billing fluid cause an uncontrolled change in the rheological properties of the fluid, which reduces the efficiency of the billing process. The aforementioned factors together with the periodic cyclic loads arising from the closure and construction of the well as well as an extensive period of closure of the well could significantly reduce the strength of the consolidation agent filler. In another method, a fibrous material mixed with a consolidating material is added with the objective of limiting the transport of a consolidation agent placed in a formation (US5330005), in this process, the fibers are crosslinked between the particles of consolidation and therefore increase the consolidation force and restrict the transfer of the consolidation agent back-flow. In addition, the addition of fibers allows a more effective redistribution of the fillers through the addition of screens over a large area of consolidation agent filler. A fibrous structure is more flexible compared to the cured resin consolidating agent; This allows the movement of the consolidation agent-fiber filling without the deterioration of the resistance property. In another method (US 5909073), bundles of fibers comprising about 5 to 200 separate fibers with a length of 0.8 to 2.5 mm and a diameter of 10 to 1,000 and m are used to prevent the transfer of the consolidating agent from the well. In this process, the fiber bundle structure is fixed from one side. A method is known for mixing the consolidating agent with the deformable particulate material in the form of beads (US 6059034). The said deformable particles are made of a polymeric material. The deformable polymer particles could have different shapes (oval, wedge-like, cubic, rod-like, cylindrical, conical, etc.); however, a maximum base to length ratio equal to or less than 5 is preferable. In the case of deformable materials with a cone-shaped diameter as well as for aluminum particles, the maximum base-to-base ratio would preferably be equal to or less than 25. The deformable particles could be manufactured as spherical balls of plastic or composite particles. containing a non-deformable core and a deformable coating. In general, the volume of the non-deformable core is approximately 50 to 95% (vol.) Of the total volume of the particles and can be made of silica, cristobalite, graphite, gypsum or talc. In another embodiment (US 6330916), the core consists of deformable materials and could include ground or crushed materials, for example, nutshell, grain husk, fruit seeds and processed wood. To fix A consolidating agent and restrict its transfer, a consolidation agent blend with polymeric materials (US 5582249) could also be applied. The adhesive compositions either in mechanical contact with the particles of the consolidating agent, form a sphere and cover the particles with a thin sticky layer. As a result, the particles adhere to each other, as well as to the sand or crushed fragments of the consolidating agent, thus completely preventing the transfer of the solid particles from the fracture. The ability to maintain adhesiveness over a long period of time and at increasing temperatures of well bore without seams or hardening is the intrinsic characteristic of sticky compounds. The sticky materials could be combined with other chemical agents, which are used in the billing process of the formation, for example, retarding agents, antimicrobial agents, polymer gel destroyers, as well as antioxidants and delaying agents for wax and corrosion formation. (US 6209643). There is another known method for supporting fractures with the application of sticky agents and resinous consolidation agents (US 7032667). US Patent No. 6742590 discloses a method for protecting fractures from the transfer of the consolidating agent filler, which uses a mixture of sticky materials with deformable particles, which themselves are effective additives to prevent the transfer of the consolidating agent.

Another variety of materials used to combat the transfer of the consolidating agent are the thermoplastic materials (US 5501274, EP 0735235). The thermoplastic materials, when mixed with a consolidating agent, are able to soften when exposed to high temperatures of the rocks, and then they adhere with the consolidating agent to form agglutinated aggregates which include a plural amount of the active agent. consolidation. A method for using thermoplastic materials blended with a resinous consolidating agent is known (US 5697440). In a number of methods, a thermoplastic material is mixed with the consolidating agent in a liquid state or in the form of a solution in a suitable solvent (US 6830105). In this case, an elastomer-forming compound could solidify either on its own, or under the influence of additional special chemical reagents, to form thermoplastic materials. Another known method describes the application of a billing fluid which is a self-degrading cement (US patent application No. US 2006/0169448) which comprises acid and major components, whose interaction causes the formation of a cementitious material, as well as a degradation component, which could disintegrate under the conditions of the fracture and ensures the formation of cavities in the cement. Another known method describes the training billing process using a new type of consolidation particles as well as the composition of a new material to create filters packed with gravel with the application of hydrated cement particles with an average size ranging from 5 μ? t 2.5 cm (U.S. Patent Application No. 2006/0162926, US 2006/0166834). DESCRIPTION OF THE INVENTION This invention relates to the oil and gas industry, in particular, to the development of a method to prevent the transfer of consolidating agent from fractures. The suggested method for the consolidation of fractures in an underground stratum is ensured as reliable protection of the well of the transport of consolidation agent from the fracture. In this method, a formation billing fluid is mixed with a consolidation filler and a granular binder material with a length-width ratio equal to or less than 10, and therefore, a formation billing process is implemented. Then, the granulated agglutination material solidifies to form a firm mass, homogeneous with the consolidating agent, which obstructs the closure of the fracture and prevents the transfer of consolidation. The technical results of this invention are as follows: 1. The billing fluid composition is obtained by mixing a consolidation filler and a granular agglutination component with a length-width ratio equal to or less than 10, which could be solidified under the conditions of underground formation. 2. The composition of the fracturing fluid is obtained by mixing a consolidation filler and a granular binder composition in the form of a powder, whose size varies from approximately 1 μp? at approximately 500 ym. In this case, the powder-like particles of the binding component come into contact with the consolidation filler and then solidify, thereby increasing the strength of the consolidation filler packing. 3. The composition of the billing fluid is obtained by mixing a consolidation filler and granulated agglutination or powder material as well as other components that obstruct the transport of the consolidation material from the fracture, including deformable particles and adhesives and similar materials. fibers. 4. The development of the filter packed with gravel is based on the application of a working fluid comprising a consolidation filler and a granular bonding component with a length-to-width ratio equal to or less than 10, or comprising a filler consolidation and a granular agglutination composition in the form of a powder, whose size varies from approximately 1 μp? at approximately 500 μ ?? At least one of the materials listed below can be used as a consolidation filler; ceramic particles and sand in a different way, consolidation agents solidified in plates and curables, and sands; expanded clay, swollen, vermiculite, and agloporite. The consolidating agent or the polymer coated sand can be used as a consolidation filler. The granular agglutination and powder-like components could be added in a billing fluid either in a dry state, or in the form of suspensions in water, working fluid, gel or other suitable solvents, including those modified with various surfactants. At least one of the binding components of the hardening classes listed below could be used as a granulating component of agglutination: hydraulic, pneumatic and autoclave hardening as well as the acid-proof binder materials as well as their blends, including: Binding materials based on crystalline hydrates of CaS04 and anhydrite (gypsum bonding materials); 2. CaO-based binding materials, CaO hydration and carbonization products (lime agglutination materials); 3. MgO-based binding materials and saline sealants (magnesia binding materials); 4. Lime-silica stone bonding materials comprising a mixture of CaO or Ca (OH) 2 with fine grinding silica, which solidify at elevated temperature; 5. Lime-pozzolanic agglutination materials and lime -chards comprising a component contng lime and a reactive silica in the form of silica glass or amorphous silicate, whose hardening occurs due to the interaction of lime with a silicon oxide or active glass with the formation of calcium hydrosilicates; Slag-alkali agglutination materials, which include a component comprising caustic alkalies and slag, preferably in a glassy state, the hardening of which is associated with the formation of alkali aluminum silicate; 7. Cements (binders) based on highly basic calcium silicates (Portland cement slag, natural cement, calcareous cement, hydraulic lime), whose binding properties are essentially predefined by the hydration of the tricalcium (Ca3Si05) and dicalcium silicates ( Ca2Si04), including slag-portland cement; 8. Cements based on low basicity calcium aluminates (CaA, CA2, Ci2A7) as well as based on their derivatives, for example, calcium sulfoaluminates, calcium fluoroaluminates (aluminate cement, high alumina cement, cement sulfoaluminate); cements with a high content of iron oxide and iron oxide cements with a high sulfur content; 9. Cements based on calcium ferrites and their derivatives - calcium sulfoferrites; 10. Phosphoric bonding materials (cement and bonding materials), which harden due to the formation of phostates; 11. Agglutination materials based on water-soluble silicates including alkali metal silicates (soluble glasses) and organic-based silicates; 12. Polymer-cement and silicate-polymer bonding compositions which include organic compositions as modifying components and organic bonding materials (cement, soluble glasses) as the base; 13. Hydroxy salts of aluminum, chromium, zirconium, colloidal solution of silica and aluminum oxide, crystalline partially dehydrated hydrates of aluminum sulfates and calcium aluminates. A granular agglutination component could comprise either a component, or have a multi-component composition. In addition to the bonding components the granular bonding component A could include components which ensure the required strength properties (eg, polymers) and density (eg, barite particles, red iron ore, glass beads, particles). porous). A granular bonding component could be formed in a different manner: spherical, cylindrical, spastic, cubic, oval, laminar, scaly, irregularly shaped or a mixture of the aforementioned forms, but with a length to width ratio that is the same or less than 10. The content of granular agglutination filler in the total consolidation volume and granular fillers varies in the range of 0.1 to 99.9% by weight. The actual density of the granulated bonding agent could vary in the range of 0.3 to 5 g / cm3. At least one of the bonding components of the hardening classes listed below could be used as a powder binding component: hydraulic, air and autoclave hardening as well as acid-binding binder materials as well as mixtures thereof; including: 1. Agglutination materials based on crystalline hydrates of CaS0 and anhydrite (gypsum binding materials); 2. Agglutination materials based on CaO, hydration products and carbonization of CaO (lime agglutination materials); 3. MgO-based binding materials and saline sealants (magnesia binding materials); 4. Lime-silica stone bonding materials comprising a mixture of CaO or Ca (OH) 2 with fine grinding silica, which solidify at elevated temperature; 5. Lime-pozzolanic agglutination materials and lime -chards comprising a component containing lime and a reactive silica in the form of silica glass or amorphous silicate, whose hardening occurs due to the interaction of lime with a silicon oxide or active glass with the formation of calcium hydrosilicates; Slag-alkali agglutination materials, which include a component comprising caustic alkalies and slag, preferably in a glassy state, the hardening of which is associated with the formation of alkali aluminum silicate; 7. Cements (binders) based on highly basic calcium silicates (Portland cement slag, natural cement, calcareous cement, hydraulic lime), whose binding properties are essentially predefined by the hydration of the tricalcium (Ca3Si05) and dicalcium silicates ( Ca2Si04), including slag-portland cement; 8. Cements based on low basicity calcium aluminates (CaA, CA2, Ci2A7) as well as based on their derivatives, for example, calcium sulfoaluminates, calcium fluoroaluminates (aluminate cement, high alumina cement, cement sulfoaluminate); cements with a high content of iron oxide and iron oxide cements with a high sulfur content; 9. Cements based on calcium ferrites and their derivatives - calcium sulfoferrites; 10. Phosphate bonding materials (cement and bonding materials), which harden due to the formation of phostates; 11. Agglutination materials based on water-soluble silicates including alkali metal silicates (soluble glasses) and organic-based silicates; 12. Polymer-cement and silicate-polymer bonding compositions which include organic compositions as modifying components and organic bonding materials (cement, soluble glasses) as the base; 13. Hydroxy salts of aluminum, chromium, zirconium, colloidal solution of silica and aluminum oxide, crystalline partially dehydrated hydrates of aluminum sulfates and calcium aluminates. The size of the powder-like bonding materials varies from about 0.5 to 500 μt ?. The content of the powder-like binding materials in the consolidation filler varies from 0.1 to 99.9% by weight. The density of the powder-like binding materials could vary from about 0.5 to about 5 g / cm 3. Granulate or powder-like granulation materials will be used in the mixture with a consolidating agent whose concentration in the mixture could vary in the range of 0.1 to 99.9%. The agglutination or powder-like granulation materials could be added to the consolidation fluid either in a dry state or in the form of suspensions in water, working fluid, gel or other suitable solutions including those modified by various surfactants or surfactants.

Claims

CLAIMS 1. A method to prevent the transfer of the consolidation material from a fracture, characterized in that, a fluid used in the process of billing the formation is mixed with a consolidating agent and a granulated bonding component in length-to-width ratio less than or equal to 10, which is able to solidify under the conditions of the underground formation. The method according to claim 1, characterized in that the content of granular agglomeration filler in the total volume of the consolidation and granulation fillers varies from 0.1 to 99.9% by weight. The method according to claim 2, characterized in that at least one of the components of a group comprising the acid-proof binder materials of the classes of hydraulic hardening, air hardening and autoclaving as well as their mixtures, they are used as a granular bonding component. 4. The method according to claim 2, characterized in that the gypsum bonding materials are used as a granular bonding component. The method according to claim 4, characterized in that the binding materials based on crystalline hydrates of CaS04 and anhydrite are used as a granulated agglutination component. 6. The method according to claim 2, characterized in that the lime agglutination materials are used as a granular bonding component. The method according to claim 2, characterized in that the CaO-based binding materials or CaO hydration and carbonization products are used as a granular bonding component. The method according to claim 2, characterized in that the magnesia binding materials are used as a granular bonding component. The method according to claim 2, characterized in that the MgO-based binding materials and saline sealants are used as a granular bonding component. The method according to claim 2, characterized in that the lime-silica binding material comprising a mixture of CaO or Ca (OH) 2 with fine grinding silica and which is capable of hardening at elevated temperatures is used. as the granular agglutination component. 11. The method according to claim 2, characterized in that the lime-pozzolanic components and lime-scythe are used as a granulated bonding component. The method according to claim 2, characterized in that the components containing lime and reactive silicon acid in the form of amorphous silica or silicate glass whose hardening is caused by the interaction of the lime with the active silica or the glass with the Formation of calcium hydrosilicates, is used as a granular agglutination component. 13. The method according to claim 2, characterized in that the slag-alkali agglutination components comprising a constituent that includes a caustic alkali and slag in a vitreous state, and whose hardening proceeds with the formation of aluminum alkali silicates are They use as a granulated bonding component. 1 . The method conforms to claim 2, characterized in that, the cements based on highly basic calcium silicates whose binding properties are mainly defined by the hydration of the tricalcium (Ca3Si05) and dicalcium (Ca2Si04) silicates (including Portland cement) ), are used as the granular bonding component. 15. The method according to claim 14, characterized in that Portland cement clinker or slag, Roman cement or lime scale are used as highly basic calcium silicate based cements. The method according to claim 2, characterized in that, at least one of the cements based on low basicity calcium aluminates (CaA), CA2, Ci2A7), calcium sulfoaluminates, calcium fluoroaluminates (aluminate cement, high alumina cement, sulfoaluminate cement), as well as iron and sulfur-iron cements are used as a granular agglutination component. 17. The method according to claim 2, characterized in that cements based on calcium ferrites and / or calcium and sulfur ferrites are used as a granulated bonding component. 18. The method according to claim 2, characterized in that the phosphatic bonding materials, which harden due to the formation of phostates, are used as a granular bonding component. The method according to claim 2, characterized in that the water-soluble silicates including alkali metal silicates and / or organic-based silicates are used as a granular bonding component. The method according to claim 2, characterized in that the polymer-cement and silicate-polymer binder compositions which comprise organic compounds as modifying components and organic binder materials as the base are used as a granular binder component . The method according to claim 2, characterized in that at least one of the substances comprising hydroxy salts of alumina, chromium, zirconium, colloidal and silica solutions, partially dehydrated crystalline hydrates of sulfated aluminum and calcium aluminates are used as a granulated agglutination component. The method according to claim 2, characterized in that such components as polymers, barite particles, red iron ore, glass beads and porous particles are additionally used to improve strength and density. The method according to claim 2, characterized in that at least one of a group of fillers including consolidating agents, sand with polymeric coating, ceramic particles, sand, curing agents cured in plates or curable in plates and sands. Expanded, swollen clay, and agloporite could be used as a consolidating agent. 24. The method to prevent the transfer of the consolidation material from the fractures, characterized in that, a billing fluid is mixed with a consolidating agent and the binding components in the form of a powder whose size varies from 0.5 to 500 μp ?. The method according to claim 24, characterized in that the content of the powder binding filler in the total consolidation volume and the powder-like fillers varies in the range of 0.1 to 99.9% by weight. The method according to claim 25, characterized in that at least one of the components of the group comprising the acid-proof binder materials of the hydraulic hardening, air hardening and autoclaving classes is used as a material of agglutination similar to dust. 27. The method according to claim 25, characterized in that the gypsum bonding materials are used as a powder-like binding component. 28. The method conforms to claim 27, characterized in that the binding materials based on crystalline hydrates of CaS04 and anhydrite are used as a powder-like binding component. 29. The method according to claim 25, characterized in that the lime agglutination materials are used as a powder-like binding component. 30. The method according to claim 25, characterized in that the CaO-based binding materials or CaO hydration and carbonization products are used as a powder-like binding component. 31. The method according to claim 25, characterized in that the magnesia binding materials are used as a powder-like binding component. 32. The method according to claim 31, characterized in that the MgO-based binding materials and saline sealants are used as a powder-like binding component. The method according to claim 25, characterized in that the lime-silica binding material comprising a mixture of CaO or Ca (0H) 2 with fine grinding silica and which is capable of hardening at elevated temperatures is used. as the powder-like agglutination component. 34. The method according to claim 25, characterized in that the lime-tannic and lime-slag components are used as a powder-like binder component. 35. The method according to claim 34, characterized in that the components containing lime and reactive silicon acid in the form of amorphous silica or silicate glass whose hardening is caused by the interaction of lime with active silicon oxide or glass with The formation of calcium hydrosilicates is used as a powder-like binding component. 36. The method according to claim 25, characterized in that the slag-alkali agglutination components which include a component that includes a caustic alkali and slag, preferably in a vitreous state, whose hardening proceeds with the formation of alkali metal silicates. Alkaline aluminum is used as a powder-like binding component. 37. The method according to claim 25, characterized in that the cements based on highly basic calcium silicates (Portland cement scoria, natural cement, calcareous cement, hydraulic lime), whose binding properties are predefined mainly by the hydration of tricalcium (Ca3Si05) and dicalcium (Ca2Si04) silicates, including Portland cements, are used as a powder-like binding component. 38. The method according to claim 37, characterized in that the portland cement slag, the Roman cement or the limestone is used as a cement based on highly basic calcium silicate. 39. The method according to claim 25, characterized in that at least one of the cements based on at least one of the low basicity calcium aluminates (CaA, CA2, C12A7) as well as based on their derivatives, for example, calcium sulfoaluminates, calcium fluoroaluminates (aluminate cement, high alumina cement, sulfoaluminate cement); high iron content cements and high sulfur iron oxide cements as used as a powder-like agglutination component. 40. The method according to claim 25, characterized in that cements based on at least one of calcium ferrites and their calcium sulfoferrites are used as a powder-like binding component. 41. The method according to claim 25, characterized in that the phosphatic agglutination materials, which harden due to the formation of phostates, are used as a powder-like binding component. 42. The method according to claim 25, characterized in thatWater-soluble silicates - the binding materials which include at least one of the alkali metal silicates and organic-based silicates are used as a powder-like binder component. 43. The method according to claim 25, characterized in that the polymer-cement and silicate-polymer binder compositions which include organic compositions as modifying components and inorganic binder materials as the base, are used as a binder component. similar to dust. 44. The method according to claim 25, characterized in that at least one of the compositions listed below is used as a powder-like binding material: aluminum hydroxy salts, chromium, zirconium, silica colloidal solution and aluminum oxide , partially dehydrated crystalline hydrates of aluminum sulfates and calcium aluminates. 45. The method according to claim 25, characterized in that components are additionally used to provide the required strength and density properties (polymers, barite particles, hematite, glass spheres, porous particles). 46. The method conforms to point 25, characterized in that at least one of the group of fillers comprising the consolidating agent, sand with polymeric coating, ceramic particles, sand, curing agents cured in plates and curable in plates and sands, Expanded clay, vermiculite, agloporite, can be applied as a consolidating agent. 47. The method according to claim 25, wherein the density of the powder-like binder component ranges from 0.5 to about 5 g / cm3. 48. The method to prevent the transfer of the consolidation material from the fractures, in which a formations billing liquid is mixed with a consolidating agent, the granular agglutination component or similar powder as well as with the components that prevent the transfer of consolidation from fractures, including deformable particles, adhesive and fibrous materials. 49. The filter packed with gravel obtained due to the application of a working fluid comprising a consolidation filler and the granulated agglutination component with a length-to-width ratio less than or equal to 10, or comprising a consolidation filler and a binding compound in the form of a powder, the size of which varies in the range of about 1 to about 500 μp ?.