WO2024060935A1 - Hose, hose assembly, and preparation method - Google Patents

Abstract

An ultra-high-pressure and equal-diameter acid fracturing hose assembly, comprising a hose body and a metal joint. The metal joint comprises an inner pipe (1), a first outer pipe (2) sleeved on the outer side of the inner pipe, a second outer pipe (3) sleeved on the outer wall of the first outer pipe, and a loop (4) threadedly connected to an inner end of the inner pipe; the first outer pipe and the second outer pipe are fastened separately; the outer wall of the loop is provided with an outer slot; an end of the first outer pipe is provided with an inner boss fitting the outer slot; the inner end of the inner pipe is provided with a connecting portion; the outer wall of the inner pipe is provided with first protrusions (6); the inner wall of the first outer pipe is provided with second protrusions (5) engaged with the first protrusions in a staggered manner; the hose body is clamped between the engagement surfaces of the first protrusions and of the second protrusions; the inner wall of the second outer pipe is provided with a plurality of small protrusions (13). The ultra-high-pressure and equal-diameter acid fracturing hose assembly can withstand large in-pipe pressure and high tensile force without separation between a hose and a metal joint, has excellent sealing performance and is not prone to leakage. In addition, provided are an acid fracturing hose and a preparation method therefor.

Description

Hoses, hose assemblies and preparation methods

This application is required to be submitted to the China Patent Office on September 23, 2022, with the application number 202222549443.9 and the utility model name "Ultra-high pressure equal diameter acidizing fracturing hose assembly", and on January 10, 2023 A Chinese patent application with the application number 202310035390.5 and the invention title "Hoses, hose assembly and preparation method" was submitted to the China Patent Office on February 3, 2023, and the application number was 202310084796.2 and the invention was submitted to the China Patent Office on February 3, 2023. The Chinese patent application titled "Hose, Hose Assembly and Preparation Method" was submitted to the China Patent Office on February 6, 2023. The application number is 202310085327.2, and the invention name is "Hoses, Hose Assembly and Preparation Method". Method", as well as a Chinese patent application submitted to the China Patent Office on February 17, 2023, with the application number 202320251538.4 and the utility model name "hoses and hose assembly", and a Chinese patent application filed on January 18, 2023 A U.S. provisional patent application with application number 63/439,602 and the invention title "Hoses, hose assemblies and preparation methods" was filed with the U.S. Patent and Trademark Office on July 27, 2023, and was filed with the U.S. Patent and Trademark Office on July 27, 2023 , application number 18/226,798, entitled "Hoses, hose assemblies and preparation methods" U.S. patent application priority, the entire content of which is incorporated by reference in this application.

Technical field

The present invention relates to the technical field of hose connection, and in particular to an ultra-high-pressure equal-diameter acidizing and fracturing hose assembly, an acidizing and fracturing hose, and a preparation method of an acidizing and fracturing hose.

Background technique

The acidizing fracturing hose assembly is one of the indispensable components in the shale oil fracturing system, and its sealing performance directly determines the working performance of the fracturing system.

In the existing technology, hoses and metal joints are connected by internal and external pipes, which can easily cause detachment between the hose and the metal joint when subjected to large internal pressure and high tensile force, resulting in poor connection sealing performance. Poor, easy to leak, complicated manufacturing process and high manufacturing cost.

To sum up, how to effectively solve problems such as difficulty in connecting hoses and metal joints is an urgent problem that those skilled in the art currently need to solve.

Contents of the invention

The object of the present invention is to provide an ultra-high pressure equal-diameter acidizing and fracturing hose assembly, an acidizing and fracturing hose, and a preparation method of an acidizing and fracturing hose, which can withstand larger intra-pipe pressures and higher tensile forces. There will be no separation between the hose and the metal joint, and it has excellent sealing performance and is not easy to leak.

In order to solve the above technical problems, the present invention provides the following technical solutions:

An ultra-high-pressure equal-diameter acidification fracturing hose assembly includes a hose body and a metal joint. The metal joint includes an inner pipe, a first outer pipe for being sleeved on the outside of the inner pipe, and a first outer pipe for being sleeved on the outside of the inner pipe. The second outer tube on the outer wall of the first outer tube and the wire loop for threaded connection with the inner end of the inner tube, the first outer tube and the second outer tube are individually buckled, and the wire loop is The outer wall has an outer clamping groove, the end of the first outer tube has an inner clamping platform that matches the outer clamping slot, the inner end of the inner tube has a connecting portion, and the outer wall of the inner tube has a first protrusion. The inner wall of the first outer tube has a second protrusion for offset engagement with the first protrusion, wherein when the metal joint is connected to the hose body, the hose body clamp Holded between the bite surfaces of the first protrusion and the second protrusion, the second outer tube has a plurality of small protrusions on the inner wall.

Optionally, the outer wall of the inner tube has an inverted eight-thorn boss, the height of the inverted eight-thorn boss is less than the height of the first boss, and the eight-point inverted boss is arranged close to the inner tube. port side.

Optionally, the inner wall of the first outer tube has a plurality of small rectangular bosses, the height of the small rectangular bosses is smaller than the height of the second boss, and the small rectangular bosses are arranged close to the first The port side of the outer tube.

Optionally, the first protrusion, the second protrusion and the small rectangular boss all have arc chamfers.

Optionally, the inner tube has a buffer slope and a straight platform buffer zone at the port thereof, and the buffer slope is connected to the inverted eight-barb boss.

Optionally, when the second outer tube (3) is pressed against the outer wall of the inner tube (1), the port of the inner tube extends an extension section outward from the port position of the second outer tube, The buffer slope and the straight platform buffer area are located at the extension section.

Optionally, the hose body is composed of an ultra-high molecular weight wear-resistant inner lining layer, an inner rubber protective layer, a skeleton layer, an outer fiber cloth layer and an outer rubber protective layer from the inside out. The skeleton layer is composed of an inner fiber cloth layer. It consists of layers, multi-layer rubber winding layers and multi-layer steel wire winding layers;

The first protrusion, the second protrusion and the small rectangular boss are respectively connected with the inner and outer surfaces of the skeleton layer. Facial occlusal fit.

Optionally, the distance between the first protrusion, the second protrusion and the corresponding surface of the skeleton layer is 2-5 mm;

The outer diameter of the first outer tube close to the port is 2-4 mm smaller than the outer diameter close to the wire ring.

Optionally, the inner wall of the hose body has a hose inner layer, the outer diameter of the inner tube is the same as the inner diameter of the hose inner layer, the inner tube is embedded in the hose inner layer, and the The inverted eight-thorn boss engages with the inner layer of the hose.

Optionally, the inner wall of the hose body has a hose outer layer, the hose assembly further includes a sealant located between the second outer tube and the hose outer layer, and the end face of the hose outer layer abuts against the port end face of the first outer tube.

An acidizing and fracturing hose, including a hose body of any one of the above ultra-high-pressure equal-diameter acidizing and fracturing hose assemblies, the skeleton layer of the hose body including Multiple layers of steel wire wrapping layers; wherein the innermost steel wire wrapping layer is the first steel wire wrapping layer, and the steel wire wrapping angle of each odd-numbered steel wire wrapping layer is α, and α is 53.0 to 54.0 degrees; and The wire strokes of the nth steel wire winding layer and the n-1th steel wire winding layer are equal, and n is an even number.

Optionally, the hose body includes an ultra-high molecular weight wear-resistant lining layer, an inner rubber protective layer, a first middle rubber layer, an inner fiber cloth layer, a second middle rubber layer, and a skeleton layer arranged in sequence from the inside out. , the twelfth middle rubber layer, outer fiber cloth layer and outer rubber protective layer;

Wherein, the inner layer of the hose is composed of an ultra-high molecular weight wear-resistant inner lining layer and an inner rubber protective layer;

The outer layer of the hose is composed of a twelfth middle rubber layer, an outer fiber cloth layer and an outer rubber protective layer.

Optionally, a corrosion-resistant and anti-leakage layer is provided between the inner rubber protective layer and the skeleton layer.

Optionally, the surface of the steel wire winding layer is provided with brass plating.

Optionally, the ultra-high molecular weight wear-resistant lining layer includes 8 to 12 layers of film, and the thickness of a single layer of film is 0.15mm;

The thickness of the inner rubber protective layer is 9 to 11 mm;

The corrosion-resistant and anti-leakage layer includes 4 to 6 layers of film, and the thickness of a single layer of film is 0.15mm;

The thickness of the middle glue layer is 0.3~0.6mm;

The thickness of the outer rubber protective layer is 2.5~4.0mm;

The inner fiber cloth layer and the outer fiber cloth layer both include several layers of cord fabric, and the thickness of a single layer of cord fabric is 0.8-1.2 mm.

A method for preparing an acid fracturing hose comprises the following steps:

The ultra-high molecular weight film is wound around the core rod, and the ultra-high molecular weight wear-resistant lining layer is produced by hot melting through vulcanization;

The inner rubber is pressed out on the ultra-high molecular weight wear-resistant lining layer and covered with an inner rubber protective layer;

On the inner rubber protective layer, the corrosion-resistant and anti-leakage layer, the first middle rubber layer, the inner fiber cloth layer, the second middle rubber layer, the skeleton layer, the twelfth middle rubber layer, the outer fiber cloth layer and the outer rubber protection layer are laid in sequence. layer, the resulting composite layer;

The composite layer is vulcanized to obtain an acidified fracturing hose.

Optionally, on the inner rubber protective layer, a corrosion-resistant and anti-leakage layer, a first middle rubber layer, an inner fiber cloth layer, a second middle rubber layer, a skeleton layer, a twelfth middle rubber layer, and an outer rubber layer are sequentially formed. Fiber cloth layer and outer rubber protective layer, including:

Lay a corrosion-resistant and anti-leakage layer on the inner rubber protective layer;

The first middle glue layer and the inner fiber cloth layer are wound around the corrosion-resistant and anti-leakage layer in sequence, and after hot-melt vulcanization, the adhesive is evenly applied on the inner fiber cloth layer;

The inner fiber cloth layer is wound around the second middle rubber layer, the skeleton layer, the twelfth middle rubber layer, the outer fiber cloth layer and the outer rubber protective layer in sequence.

Optionally, the first ultra-high molecular weight film is wound around a core rod, and the ultra-high molecular weight wear-resistant lining layer is produced by hot melting through vulcanization, including:

The first ultra-high molecular weight film is wound around the core rod, and the ultra-high molecular weight wear-resistant lining layer is obtained by hot melting through vulcanization; the vulcanization temperature is 145-155°C, and the vulcanization time is 30-40 minutes;

The adhesive is evenly applied on the inner fiber cloth layer after hot melt vulcanization, including:

And after hot-melt vulcanization, apply adhesive evenly on the inner fiber cloth layer, where the vulcanization temperature is 155-165°C and the vulcanization time is 10-15 minutes;

The composite layer is vulcanized to obtain an acidified fracturing hose, including:

The composite layer is placed in an environment with an air pressure of 0.5 to 0.6 MPa, heated to 150 to 170°C, kept for 1 hour, and then cooled to complete the vulcanization process and obtain an acidified fracturing hose.

Optionally, it also includes preparing the inner rubber protective layer according to the following raw materials in parts by weight:

20 to 26 parts of natural rubber; 50 to 60 parts of styrene-butadiene rubber; 15 to 20 parts of acrylic acid sodium salt ionomer; 3 to 8 parts of zinc oxide; 0.2 to 0.8 parts of sulfur; 6 to 8 parts of vulcanization accelerator; 68 to 72 parts of reinforcing agent; 15 to 20 parts of softener; 3 to 8 parts of tackifying resin; 1 to 5 parts of antioxidant; 0.1 to 0.5 parts of anti-scorch agent.

Optionally, it also includes preparing the inner rubber protective layer according to the following raw materials in parts by weight: 24 parts of natural rubber; 58 parts of styrene-butadiene rubber; 18 parts of acrylic acid sodium salt ionomer; 5 parts of zinc oxide; 0.5 parts Sulfur; 7 parts vulcanization accelerator; 70 parts reinforcing agent; 18 parts softener; 5 parts tackifying resin; 3 parts anti-aging agent; 0.3 parts anti-scorch agent.

Optionally, preparing the inner rubber protective layer includes the following steps:

In parts by weight, weigh 20 to 26 parts of natural rubber, 50 to 60 parts of styrene-butadiene rubber, 15 to 20 parts of acrylic acid sodium salt ionomer, 3 to 8 parts of zinc oxide, 68 to 72 parts of reinforcing agent, 15 to 20 parts of softener, 1 to 5 parts of antioxidant, 3 to 8 parts of tackifying resin and 0.1 to 0.5 parts of anti-scorch agent;

After mixing the above weighed raw materials evenly at 80-100°C, debind them below 110°C to obtain a degummed mixture;

Mix the degummed mixture, 0.2 to 0.8 parts of sulfur and 6 to 8 parts of vulcanization accelerator at 86 to 88°C for 2 to 5 minutes to obtain the inner rubber protective layer.

The ultra-high pressure equal-diameter acid fracturing hose assembly provided by the present invention comprises a hose body and a metal joint. The metal joint comprises an inner tube, a first outer tube, a second outer tube and a wire ring, and the hose body is clamped and clamped by the inner tube of the metal joint, the first outer tube, the second outer tube and the wire ring. The first outer tube is sleeved on the outer side of the inner tube, and the second outer tube is sleeved on the outer wall of the first outer tube. The inner wall of the second outer tube has a plurality of small protrusions, and the small protrusions press the outer wall of the first outer tube. A double outer tube is used, and the first outer tube and the second outer tube are separately buckled, which improves the material utilization rate, reduces the degree of compression deformation of the outer tube during buckling, and increases the pressure resistance of the hose assembly.

The wire loop has an internal thread, and the inner end of the inner wall has an external thread. The wire loop is threadedly connected to the inner end of the inner tube, making it easy to connect and disassemble. The outer wall of the wire loop has an outer clamping groove, and the end of the first outer tube has an inner clamping platform. The inner clamping platform matches the outer clamping slot. The first outer tube and the wire loop are connected to the outer clamping slot through the inner clamping platform. The inner end of the inner tube has a connecting portion, and the connecting portion is connected to other components or to a metal joint connected to a hose assembly.

The outer wall of the inner tube has a first protrusion, and the inner wall of the first outer tube has a second protrusion. Optionally, a third protrusion is provided on the outer wall of the inner tube. The number of the first protrusion and the second protrusion is two. The second protrusion and the first protrusion are offset and engaged, and the hose body is clamped in the bite surface of the first protrusion and the second protrusion, that is, the bite surface of the second protrusion and the bite surface of the first protrusion Clamp the hose body. The above-mentioned first convex bite surface and the second convex bite surface form compression deformation sections with different forces on the hose body. On the one hand, it increases the tensile resistance and on the other hand, it increases the sealing performance, so that the hose assembly has Excellent overall performance.

In the ultra-high-pressure equal-diameter acidification fracturing hose assembly provided by the invention, the inner pipe is sleeved with the first outer pipe and the second outer pipe, and the sleeve part clamps the end of the hose body, and the first outer pipe is The second outer tube is deformed by applying pressure to tightly clamp the end of the hose body, and the second outer tube and the first outer tube are tightly clamped by applying pressure. The hose assembly can withstand large internal pressure and high tensile force without detachment between the hose and the metal joint. It has excellent sealing performance and is not easy to leak. At the same time, the manufacturing process is simple and easy to manufacture. Lower cost.

The present invention also relates to an acidizing and fracturing hose, which includes a hose body of any of the above ultra-high-pressure equal-diameter acidizing and fracturing hose assemblies. The skeleton layer of the hose body includes the following components: Multiple layers of steel wire wrapping layers are provided; wherein, the multiple layers of steel wire wrapping layers are divided into even-numbered layer groups and odd-numbered layer groups, the innermost steel wire wrapping layer is the first layer of steel wire wrapping layer, and the odd-numbered layer groups of the steel wires The steel wire winding angles of the winding layers are equal, and the steel wire winding angles of the steel wire winding layers in the even-numbered layer groups decrease in sequence from the inner steel wire winding layer to the outer steel wire winding layer;

Compared with traditional oil drills using hoses, by improving the skeleton layer, the acidified fracturing hose provided by the present invention has better pressure resistance and less pressure deformation. The inner layer of the hose itself has high temperature resistance and oil resistance. , corrosion resistance, wear resistance, self-lubrication and impact absorption properties. During the process of transporting acidified fracturing fluid, the friction resistance is smaller, it is not easy to adhere to paraffin, asphalt and other sticky substances, and it is easier to clean;

Secondly, the acidified fracturing hose can maintain stable chemical properties in concentrated hydrochloric acid with a concentration of <80%, sulfuric acid with a concentration of <75%, and nitric acid with a concentration of <20%, and the acidified fracturing hose has good self-lubricating properties. ; And the operating temperature of the acidified fracturing hose can reach 80 to 100°C, and the continuous service life of the acidified fracturing hose can reach 8 to 12 months.

The invention also relates to a method for preparing an acidified fracturing hose, which includes the following steps: winding the first ultra-high molecular weight film around a core rod, and obtaining an ultra-high molecular weight wear-resistant lining layer through vulcanization and hot melting; The inner rubber is pressed out on the molecular weight wear-resistant lining layer and covered with an inner rubber protective layer; on the inner rubber protective layer, a corrosion-resistant and anti-leakage layer, the first middle rubber layer, the inner fiber cloth layer, and the second middle rubber are laid in sequence. layer, The composite layer obtained by the skeleton layer, the twelfth middle rubber layer, the outer fiber cloth layer and the outer rubber protective layer; the composite layer is vulcanized to obtain an acidified fracturing hose; therefore, the acidified fracturing soft hose can be obtained by using the above method. Tube;

Since the above-mentioned acid fracturing hose has the above-mentioned technical effects, the preparation method including the acid fracturing hose should have the same technical effects, which will not be described in detail here.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an ultra-high pressure equal diameter acidizing fracturing hose assembly provided by a specific embodiment of the present invention;

Figure 2 is a schematic structural diagram of the inner tube in one embodiment of the present invention;

Figure 3 is a schematic structural diagram of an inverted eight-thorn boss in an embodiment of the present invention;

Figure 4 is a schematic structural diagram of the yarn rewinding loop in one embodiment of the present invention;

FIG5 is a schematic structural diagram of a first outer tube in one embodiment of the present invention;

Figure 6 is a schematic structural diagram of the second outer tube in an embodiment of the present invention;

Figure 7 is a schematic structural diagram of the hose body in one embodiment of the present invention;

Figure 8 is a schematic structural diagram of the skeleton layer in an embodiment of the present invention.

The drawings are marked as follows:

Inner tube 1, first outer tube 2, second outer tube 3, wire ring 4, second protrusion 5, first protrusion 6, outer fiber cloth layer 7, outer rubber protective layer 8, hose inner layer 9, Hose outer layer 10, extension section 11, small rectangular boss 12, small boss 13, inverted eight-thorn boss 14, skeleton layer 15, sealant 16, ultra-high molecular weight wear-resistant lining layer 17, inner rubber protective layer 18. Inner fiber cloth layer 19, connecting portion 20, second middle glue layer 21, corrosion-resistant and anti-leakage layer 22, first middle glue layer 23, and twelfth middle glue layer 24.

Detailed ways

The core of the present invention is to provide an ultra-high-pressure equal-diameter acidified fracturing hose assembly, which can withstand greater intra-pipe pressure and higher tensile force without There is no separation between the hose and the metal joint, and it has excellent sealing performance and is not easy to leak.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In this document, relational terms such as first, second, etc. are used merely to distinguish one entity or operation from another entity or operation and do not necessarily require or imply the existence of any such entity or operation between these entities or operations. Actual relationship or sequence. Furthermore, the terms "comprises," "comprises," or any other variations thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also those not expressly listed other elements, or elements inherent to the process, method, article or equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article, or apparatus that includes the stated element.

The directional terms mentioned in the present invention, such as "up", "down", "left", "right", "front", "back", "inside", "outside", "side", etc. are only used for conjunction. The example directions in the drawings illustrate embodiments. For example, in a pipe structure, "inside" is usually used to refer to the side toward the central axis of the pipe, while "outer" is usually used to refer to the side away from the central axis of the pipe. Therefore, the directional terms used are to illustrate and understand the present invention, but not to limit the present invention. In the figure, units with similar structures are represented by the same numbers.

In addition, the present invention will be described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for convenience of explanation, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples and should not be limited here. protection scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual production.

Please refer to Figures 1 to 8. Figure 1 is a schematic structural diagram of an ultra-high pressure equal diameter acidizing fracturing hose assembly provided by a specific embodiment of the present invention; Figure 2 is a schematic structural diagram of the inner tube; Figure 3 is a schematic structural diagram of the inner tube. The structural schematic diagram of the inverted eight-thorn boss; Figure 4 is the structural schematic diagram of the inverted wire loop; Figure 5 is the A schematic structural diagram of an outer tube; Figure 6 is a schematic structural diagram of a second outer tube; Figure 7 is a schematic structural diagram of the hose body.

In a specific embodiment, the ultra-high-pressure equal-diameter acidification fracturing hose assembly provided by the present invention includes a hose body and a metal joint. The metal joint includes an inner tube 1 and a first first The outer tube 2, the second outer tube 3 that is sleeved on the outer wall of the first outer tube 2, and the wire ring 4 that is threadedly connected to the inner end of the inner tube 1, the first outer tube 2 and the second outer tube 3 are individually buckled, and the wire ring 4 The outer wall of the inner tube 1 has an outer clamping groove, the end of the first outer tube 2 has an inner clamping platform that matches the outer clamping groove, the inner end of the inner tube 1 has a connecting portion 20, and the outer wall of the inner tube 1 has a first protrusion 6, The inner wall of the first outer tube 2 has a second protrusion 5 that is offset and engaged with the first protrusion 6. The hose body is clamped in the interlocking surface of the first protrusion 6 and the second protrusion 5. The second outer tube There are multiple small protrusions 13 on the inner wall of 3.

In the above structure, the ultra-high pressure equal diameter acidizing fracturing hose assembly includes a hose body and a metal joint. The metal joint includes an inner tube 1, a first outer tube 2, a second outer tube 3 and a wire ring 4. The hose body consists of the inner tube 1 of the metal joint, the first outer tube 2, the second outer tube 3 and the wire ring 4. Withhold and clamp.

The first outer tube 2 is mounted on the outside of the inner tube 1, and the second outer tube 3 is mounted on the outer wall of the first outer tube 2. The inner wall of the second outer tube 3 has a plurality of small protrusions 13, and the small protrusions 13 are pressed tightly. The outer wall of the first outer tube 2. The embodiment of the present application does not impose specific restrictions on the size and shape of the small protrusion 13 , as long as the small protrusion 13 is a protruding structure on the inner wall of the second outer tube 3 and can exert a certain pressure on the outer wall of the first outer tube 2 . In some embodiments, the size of the small protrusion 13 is smaller than the size of the first protrusion 6 and the second protrusion 5 . The embodiment of the present application adopts a double outer tube structure. The first outer tube 2 and the second outer tube 3 are separately crimped, which improves the material utilization rate, reduces the degree of pressure deformation of the outer tube during crimping, and increases the hose assembly. pressure resistance performance.

The wire ring 4 has an internal thread, and the inner end of the inner tube 1 has an external thread. The wire ring 4 is threadedly connected to the inner end of the inner tube 1, making the connection easy and easy to disassemble.

The outer wall of the wire ring 4 has an outer clamping groove, and the end of the first outer tube 2 has an inner clamping platform. The inner clamping platform matches the outer clamping slot. For example, the inner clamping platform and the outer clamping slot have at least partially complementary shapes, so that The inner card table can be embedded in the outer card slot. The first outer tube 2 and the wire ring 4 are connected to the outer clamping groove through the inner clamping platform.

The inner end of the inner tube 1 is provided with a connecting portion 20, which is connected to other components or to a metal joint of another hose assembly.

The outer wall of the inner tube 1 has a first protrusion 6, and the inner wall of the first outer tube 2 has a second protrusion 5. Optionally, the number of the first protrusion 6 and the second protrusion 5 is two each. Of course, the first bump 6 and the second The number of protrusions 5 can be greater, and the numbers of the two can be different. The second protrusion 5 and the first protrusion 6 are staggered and engaged, that is, the second protrusion 5 and the first protrusion 6 are staggered in the direction in which the pipes extend (the transverse direction in Figure 1). The hose body is clamped in the interlocking surface of the first protrusion 6 and the second protrusion 5, that is, when the inner wall of the first outer tube 2 and the outer wall of the inner tube 1 are pressed against each other, the interlocking surface of the second protrusion 5 The hose body is clamped by the bite surface of the first protrusion 6 . The occlusal surface here can refer to the surface that forms a misaligned occlusion. As shown in Figure 1, the occlusal surface of the first protrusion 6 can be the surface on which the first protrusion 6 is formed on the outer wall of the inner tube 1, and the occlusal surface of the second protrusion 5. It may be the surface on which the second protrusion 5 is formed on the inner wall of the first outer tube 2 . The occlusal surface of the first protrusion 6 and the occlusal surface of the second protrusion 5 form a compressive deformation section of the hose body that exerts forces in different directions. On the one hand, it increases the tensile resistance and on the other hand, it increases the sealing performance, making the soft The tube assembly has excellent overall performance.

Preferably, the first protrusion, the second protrusion and the small protrusion can all be set in a rectangular shape, or can be set in a trapezoidal, rectangular, arc-shaped, etc. There is no specific limitation here as long as the same effect can be achieved.

In the ultra-high-pressure equal-diameter acidification fracturing hose assembly provided by the present invention, the inner pipe 1 is connected to the first outer pipe 2 and the second outer pipe 3. The sleeve part clamps the end of the hose body, and the third outer pipe is The first outer tube 2 and the second outer tube 3 apply pressure to deform and tightly clamp the end of the hose body. The second outer tube 3 and the first outer tube 2 are tightly clamped by applying pressure. The hose assembly can withstand large internal pressure and high tensile force without detachment between the hose and the metal joint. It has excellent sealing performance and is not easy to leak. At the same time, the manufacturing process is simple and easy to manufacture. Lower cost.

The above-mentioned ultra-high-pressure equal-diameter acidified fracturing hose assembly is only a preferred solution, and is not limited to this. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation modes. The outer wall of the inner tube 1 has an inverted eight-barbed boss 14. The inverted eight-barbed boss 14 can be a barb-shaped protrusion to prevent the hose and the inner tube 1 from sliding relative to each other in the direction of loosening. The height of the inverted eight-pronged boss 14 is smaller than the height of the first protrusion 6 , and the inverted eight-probed boss 14 is disposed on the side close to the port of the inner tube 1 .

In practical applications, the inverted eight-thorn boss 14 and the first boss 6 form a composite boss of the inner tube 1 . The eight-thorn boss 14 is close to the port part, and the first boss 6 is close to the inner end or the connecting part 20 . It should be noted that the port of the inner tube 1 in this application refers to the port where the metal joint is connected to the hose, that is, the other end opposite to the connecting part 20. The inner end of the inner tube 1 refers to the end of the metal joint away from the hose, that is, close to the hose. One end of the connecting part 20. As shown in Figure 1, the port of inner tube 1 is the left end, and the inner end of inner tube 1 is the right end. Follow-up The definitions of “ports” and “inner ends” of other components are similar to those of inner tube 1 and will not be described again. .

The inverted eight-thorn boss 14 acts on the inner wall surface of the hose body, and the inverted eight-thorn boss 14 presses the inner wall surface of the hose body to increase the sealing performance between the hose body and the inner tube 1 . The height of the inverted eight-thorn boss 14 is smaller than the height of the first protrusion 6. The height of the first protrusion 6 is larger, causing the skeleton layer 15 of the hose body to undergo greater and appropriate deformation, or causing the hose body wall to form A continuous concave and convex deformation, thereby increasing the tensile resistance of the hose assembly.

Based on the above-mentioned specific embodiments, the inner wall of the first outer tube 2 has a plurality of small rectangular bosses 12. In the embodiment of the present application, the size of the small rectangular bosses 12 is not specifically limited. In some embodiments, the size of the small rectangular bosses 12 is smaller than the size of the second protrusions 5. In addition, the height of the small rectangular bosses 12 is smaller than the height of the second protrusions 5. The small rectangular bosses 12 are arranged on one side of the port close to the first outer tube 2.

In actual application, the first protrusion 6 of the inner tube 1 in the hose assembly is staggered with the second protrusion 5 of the first outer tube 2, and the inner wall of the first outer tube 2 has a plurality of small rectangular bosses 12, and the height of the plurality of second protrusions 5 is smaller than the height of the second protrusion 5. After the buckling is completed, the inner diameter of the end of the first outer tube 2 close to the port portion is smaller than the inner end portion, forming an inner cone, thereby greatly increasing the tensile strength of the hose assembly; at the same time, the inner tube 1 is made of integral forged high-strength material, which is then processed by rough turning, tempering, and fine turning. Compared with the first outer tube 2, the material strength and hardness are much greater, and the first outer tube 2 requires the material ductility to be better than that of the inner tube 1, so as to reduce the compression and deformation of the skeleton layer 15 of the hose body at the first protrusion 6 when subjected to external pressure.

Based on the above-mentioned specific embodiments, the first protrusion 6, the second protrusion 5 and the small rectangular boss 12 all have arc chamfers.

In practical applications, the first protrusion 6, the second protrusion 5 and the small rectangular boss 12 are all inverted with arcs of different radii to reduce damage to the skeleton layer 15 when the inner tube 1 and the first outer tube 2 are clamped at the occlusal surfaces to clamp the hose body.

On the basis of the above-mentioned specific embodiments, the port of the inner tube 1 is provided with a buffer slope and a straight buffer area, and the buffer slope is connected to the inverted eight-thorn boss 14.

In practical applications, the port of the inner tube 1 is provided with a buffer slope and a straight buffer zone. The big end of the buffer slope (the end with the larger outer diameter) is connected to the inverted eight-thorn boss 14, and the straight buffer zone is connected to the small end of the buffer slope. end (the end with the smaller outer diameter), the outer diameter of the buffer slope and the straight platform buffer zone is smaller than the outer diameter of the inverted eight-thorn boss 14, that is, smaller than the inner diameter of the hose body, which is conducive to assembly and is not easy to Damage the inner wall of the hose body and the inner layer 9 of the hose.

On the basis of the above-mentioned specific embodiments, the port of the inner tube 1 extends outward from the port position of the second outer tube 3 by an extension section 11 , and the buffer slope and the straight platform buffer area are located at the extension section 11 .

In practical applications, the port of the inner tube 1 is extended by an extension section 11 from the port position of the first outer tube 2. That is, after the inner clamping table of the first outer tube 2 is installed into the outer clamping groove of the wire ring 4, the inner The tube 1 has an extension section 11 longer than the first outer tube 2. On the one hand, the extension section 11 increases the contact length and area between the inner wall surface of the hose body and the outer wall surface of the inner tube 1, thereby improving the leakage prevention performance; on the other hand, the extension section 11 The main body has a slight support, which can prevent the hose from having a large bending curvature at the port of the first outer tube 2 and causing a gap between the hose body and the first outer tube 2 when the hose body is bent.

In another more reliable embodiment, based on any of the above embodiments, the first protrusion 6, the second protrusion 5, and the small rectangular boss 12 are engaged with the inner and outer surfaces of the skeleton layer 15 respectively.

In practical applications, an embodiment is provided. The hose body is composed of an ultra-high molecular weight wear-resistant inner lining layer 17, an inner rubber protective layer 18, an inner fiber cloth layer 19, a multi-layer rubber winding layer and a multi-layer steel wire winding layer. The skeleton layer 15, the outer fiber cloth layer 7 and the outer rubber protective layer 8 are composed from the inside out. The hose body has excellent compression resistance, good bending performance and wear resistance, corrosion resistance and aging resistance. The outer rubber protective layer 8 also has good fire resistance.

In order to further improve the connection between the metal joint and the hose body and improve the overall performance of the hose assembly, the first protrusion 6, the second protrusion 5, and the small rectangular boss 12 are engaged with the inner and outer surfaces of the skeleton layer 15 respectively, and also That is to say, during the preparation process, the ultra-high molecular weight wear-resistant inner lining layer 17 and the inner rubber protective layer 18 of the hose body correspond to the first protrusion 6 and the second protrusion 5 on the inner tube 1 and the first outer tube 2. , the inner fiber cloth layer 19, the outer fiber cloth layer 7 and the outer rubber protective layer 8 are peeled off. Specifically, in some embodiments, the ultra-high molecular weight wear-resistant inner lining layer 17, the inner rubber protective layer 18 and the inner fiber cloth layer 19 corresponding to the first protrusion 6 on the inner tube 1 are peeled off, and the inner fiber cloth layer 19 corresponding to the first protrusion 6 is peeled off. The outer fiber cloth layer 7 and the outer rubber protective layer 8 of the second protrusion 5 on the outer tube 2 are peeled off, so that the inner and outer surfaces of the skeleton layer 15 cooperate with the first protrusion 6 and the second protrusion 5 of the inner and outer tube respectively. In this way, when the first outer tube 2 is forced to shrink and deform towards the axis, it presses the skeleton layer 15 to also shrink and deform towards the axis, so that part of the steel wire is located between the first inner protrusion 6 and the second inner protrusion 5, or in other words Both the inner and outer surfaces of the skeleton layer 15 form a continuous wave shape, so that the connection between the hose body and the metal joint is stronger. Optionally, the inverted eight-thorn boss 14 engages with the inner layer 9 of the hose, making it less likely to break away from the metal joint when the hose body is subjected to external force. The inner tube 1 A plurality of inverted eight-thorn bosses 14 are engaged with the inner lining of the hose body.

On the basis of the above-mentioned specific embodiments, the distance between the first protrusion 6, the second protrusion 5 and the surface of the corresponding skeleton layer 15 is 2-5 mm.

The outer diameter of the first outer tube 2 near the port is 2-4 mm smaller than the outer diameter near the wire ring 4 . For example, the outer diameter of the first outer tube 2 at the edge of the port is 2-4 mm smaller than the outer diameter of the first outer tube 2 at the inner edge of the wire ring 4 .

In practical applications, the distance between the first protrusion 6, the second protrusion 5 and the surface of the corresponding skeleton layer 15 is any value between 2mm and 5mm, including endpoint values, such as 3mm and 4mm. The outer diameter of the tube 2 near the port is smaller than the outer diameter near the wire ring 4 by any value between 2mm and 4mm, including the endpoint value, such as 3mm. This not only ensures the operability of assembly, but also leaves space for the first outer tube 2 to be buckled in sections, so that after the first outer tube 2 is buckled, the outer diameters of the front and rear sections should be kept as consistent as possible, so that the second outer tube 3 can be buckled in the next step. The rear outer diameter can be kept consistent and more beautiful.

On the basis of the above specific embodiments, the inner wall of the hose body has a hose inner layer 9. The outer diameter of the inner tube 1 is the same as the inner diameter of the hose inner layer 9. When the inner tube 1 is connected to a metal joint, the inner tube 1 is embedded in the inner layer 9 of the hose.

In practical applications, the inner tube 1 is embedded in the inner layer 9 of the hose through the inner layer 9 of the hose to ensure that after the buckling is completed, the inner tube 1 of the metal joint has the same inner diameter as the inner layer 9 of the hose, which is called an equal-diameter hose assembly to avoid eddy currents.

On the basis of the above specific embodiments, the outer wall of the hose body has a hose outer layer 10, and a layer of sealant 16 is evenly applied between the second outer tube 3 and the hose outer layer 10. The end surface is in contact with the port end surface of the first outer tube 2 . In some embodiments, as shown in FIG. 1 , the first outer tube 2 has a certain overlap with the hose outer layer 10 on the port side along the hose extension direction.

In practical applications, after the assembly is crimped, a layer of sealant 16 is evenly applied between the second outer tube 3 and the outer layer of the hose 10. This not only improves the sealing performance of the end, but also reduces the risk of rain and air. and other corrosion effects on the skeleton layer 15.

In addition, an acidizing and fracturing hose is provided, including a hose body of any of the above ultra-high pressure equal diameter acidizing and fracturing hose assemblies, and the skeleton layer 15 of the hose body includes the following components in sequence along the diameter direction of the hose body: Multiple layers of steel wire winding layers are provided; wherein the innermost steel wire winding layer is the first steel wire winding layer, and the steel wire winding angle of each odd-numbered steel wire winding layer is α, and α is 53.0~ 54.0 degrees, and the steel wire strokes of the n-th steel wire winding layer and the n-1th steel wire winding layer are equal, n is an even number;

That is, the multi-layer steel wire winding layers are divided into even-numbered layer groups and odd-numbered layer groups. The innermost steel wire winding layer is the first steel wire winding layer. From the inside to the outside, the steel wire winding angles of the odd-numbered steel wire winding layers are all α. α is 53.0 to 54.0 degrees, and the wire strokes of the n-th steel wire winding layer and the n-1th steel wire winding layer are equal, and n is an even number;

The steel wire winding angle of the odd-numbered layer group of the hose of the present invention is 53.0 to 54.0 degrees. According to the formula T=πD/tanα, T is the stroke, D is the outer diameter of the current steel wire winding layer, and α is the steel wire winding angle of the odd-numbered layer of steel wire winding. The stroke of the steel wire winding of adjacent odd-numbered layers and even-numbered layers can be calculated, and the winding angles and strokes of each odd-numbered layer and even-numbered layer group can be designed successively according to this method.

It should be noted that the steel wire winding layer is formed by spiral winding of steel wire.

Specifically, the skeleton layer 15 is compounded on the second middle glue layer 21 of the acidified fracturing hose. In the embodiment, the number of steel wire winding layers is 10, as shown in Figure 8 below. The specific winding method is as follows:

Taking the inner diameter of the acid fracturing hose of the present invention as 127.0mm as an example, the winding angle ɑ1 of the first layer of steel wire is 53.50 degrees and the outer diameter is 163.1mm. The winding angle ɑ2 of the second layer of steel wire is 54.85 degrees and the outer diameter is 167.8mm. Standard stroke/range: 373.8/370.9～375.2;

The winding angle ɑ3 of the third layer of steel wire is 53.50 degrees and the outer diameter is 172.5mm. The winding angle ɑ4 of the fourth layer of steel wire is 54.75 degrees and the outer diameter is 177.2mm. The standard stroke/range: 395.7/392.8～397.1;

The winding angle ɑ5 of the fifth layer of steel wire is 53.50 degrees and the outer diameter is 181.9mm. The winding angle ɑ6 of the sixth layer of steel wire is 54.61 degrees and the outer diameter is 186.6mm. The standard stroke/range: 417.5/414.6～418.9;

The winding angle ɑ7 of the seventh layer of steel wire is 53.50 degrees and the outer diameter is 191.3mm. The winding angle ɑ8 of the eighth layer of steel wire is 54.50 degrees and the outer diameter is 196.0mm. The standard stroke/range: 439.4/436.5～440.8;

The winding angle ɑ9 of the ninth layer of steel wire is 53.50 degrees, the outer diameter is 200.7mm, the winding angle ɑ10 of the tenth layer of steel wire is 54.37 degrees, the outer diameter is 205.4mm, and the standard stroke/range is 461.2/458.3～462.6;

Among them, the design calculation of the pipe structure is as follows:

According to the hose process design theory, determine the best process parameters: inner rubber thickness, reinforcement layer Diameter, winding stroke, spool tension, outer diameter and density, etc.

Taking Φ127mm×103.5Mpa (PB is 232.9MPa) as an example, select copper-plated steel wires of different diameters. According to the following formulas and tables, determine the number of steel wire layers i and steel wire diameter d:

Compressive strength calculation formula

K _b =K _B ×πd ² /4×100

∑N＝ _{πDcalculated} iρCOSα/d

K _B =2150N/m ²

Among them, PB represents the burst pressure of the hose, and the unit can be MPa; KB represents the steel wire strength, and the unit can be N/mm2; N represents the number of steel wires in the unidirectional layer; d represents the steel wire diameter, and the unit can be cm; D represents the average skeleton layer Diameter, the unit can be cm; i represents the number of unidirectional steel wire layers; ρ represents the average density of steel wire layers; C represents the comprehensive correction coefficient.

Based on the above winding method, it is calculated that PB=241.6, which meets the set burst pressure requirement of 232.9MPa.

Therefore, the basic design parameters of the hose are: number of steel wire layers i=10, steel wire diameter d=2.2mm, winding angle=53.50°, 54.85°, 53.50°, 54.75°, 53.50°, 54.61°, 53.50°, 54.50°, 53.50 °, 54.37°, winding stroke = 373.8mm, 395.7mm, 417.5mm, 439.4mm, 461.2mm.

In order to demonstrate the performance of the optimized pipe structure, five control groups were set up for comparison. The pipe diameters of the acidified fracturing hoses in the five control groups were Φ51mm, Φ64mm, Φ76mm, Φ102mm, and Φ152mm. Each control group included two only Test groups with different steel wire winding angles, the specific experimental results are as follows:

It can be seen from the above experiments:

After adopting the steel wire winding method disclosed in this plan, the working pressure of the acidified fracturing hose and bursting pressure are enhanced, and the degree of compression deformation is also weakened.

Based on this, the wire winding angle of each wire winding layer of the skeleton layer 15 is improved, and the coordination between adjacent wire winding layers is coordinated, so that the acid fracturing hose has higher mechanical strength, and the acid fracturing hose can achieve a higher working pressure (up to 15000PSI) and a higher blasting pressure (up to 33750PSI). It can not only be used in different geological environments or fields, such as shield machines, sandblasting machines, concrete, tunnel excavation, transportation of highly corrosive fluids, drilling and production fields, and well repair fields, but also has a good transportation effect on different media such as 28% hydrochloric acid or corundum.

Compared with traditional oil drills using hoses, by improving the skeleton layer 15, the acid fracturing hose provided by the present invention has better high temperature resistance, oil resistance, corrosion resistance, wear resistance, self-lubrication and impact absorption properties. During the process of acidifying the fracturing fluid, the friction resistance is smaller, it is less likely to adhere to paraffin, asphalt and other sticky substances, and it is easier to clean;

Secondly, the acidified fracturing hose can maintain stable chemical properties in concentrated hydrochloric acid with a concentration of <80%, sulfuric acid with a concentration of <75%, and nitric acid with a concentration of <20%, and the acidified fracturing hose has good self-lubricating properties. , and the operating temperature of the acidified fracturing hose can reach 80 to 100°C, and the continuous service life of the acidified fracturing hose can reach 8 to 12 months.

In addition, in order to demonstrate the wear resistance of the hose after optimizing the pipe structure, six control groups were set up for comparison. The pipe diameters of the acidified fracturing hoses in the six control groups were Φ51mm, Φ64mm, Φ76mm, Φ102mm, Φ127mm, Φ152mm. Comparative tests were conducted with ordinary rubber hoses and stainless steel pipes of the same specifications. The transmission medium was 20% to 28% hydrochloric acid, accompanied by emery with a particle size of 15 to 25mm. Based on the actual working life, each test was carried out. The wear resistance of the seed tube is as shown in the following table:

Table 6 Comparative test on the wear resistance of acidified fracturing hoses with a pipe diameter of Φ51

Table 7 Comparative test on the wear resistance of acidified fracturing hoses with a pipe diameter of Φ64

Table 8 Comparative test on the wear resistance of acidified fracturing hoses with a pipe diameter of Φ76

Table 9 Comparative test on the wear resistance of acidified fracturing hoses with a pipe diameter of Φ102

Table 10 Comparative test on the wear resistance of acidified fracturing hoses with a pipe diameter of Φ127

Table 11 Comparative test on the wear resistance of acidified fracturing hoses with a pipe diameter of Φ152

It can be seen from the above table that the pumping capacity of the acidified fracturing hose prepared by the present invention is not low. At 270,000bbl, it is far superior to stainless steel pipes and rubber hoses. Therefore, the wear resistance of the acidified fracturing hose prepared by the present invention is better.

Based on the above embodiments, the hose body includes an ultra-high molecular weight wear-resistant inner lining layer 17, an inner rubber protective layer 18, a corrosion-resistant and anti-leakage layer 22, and a first middle rubber layer 23 arranged sequentially from the inside to the outside. , inner fiber cloth layer 19, second middle rubber layer 21, skeleton layer 15, twelfth middle rubber layer 24, outer fiber cloth layer 7 and outer rubber protective layer 8. Among them, the inner layer 9 of the hose is composed of an ultra-high molecular weight wear-resistant inner lining layer 17 and an inner rubber protective layer 18. The outer layer 10 of the hose is composed of a twelfth middle rubber layer 24, an outer fiber cloth layer 7 and an outer rubber protective layer 8.

Specifically, along the diameter direction of the hose body, from the inside to the outside, it includes: an ultra-high molecular weight wear-resistant lining layer 17; an inner rubber protective layer 18 compounded on the ultra-high molecular weight wear-resistant lining layer 17, The inner rubber protective layer 18 includes an EPDM rubber layer or a natural styrene-butadiene rubber layer; a corrosion-resistant and anti-leakage layer 22 compounded on the inner rubber protective layer 18 is compounded on the corrosion-resistant and anti-leakage layer. 22, the material of the first middle glue layer 23 includes natural styrene-butadiene rubber; the inner fiber cloth layer 19 compounded on the first middle glue layer 23; the composite inner fiber cloth layer The second middle glue layer 21 on 19, the skeleton layer 15 compounded on the second middle glue layer 21, the twelfth middle glue layer 24 compounded on the skeleton layer 15, the twelfth middle glue layer 24 compounded on The outer fiber cloth layer 7 is compounded with the outer rubber protective layer 8 on the outer fiber cloth layer 7 .

The inner rubber protective layer 18 is a natural styrene-butadiene rubber layer or an ethylene-propylene diene rubber layer; the first middle rubber layer 23 is made of natural styrene-butadiene rubber. The skeleton layer 15 has ten steel wire winding layers from the inside to the outside, and there is a middle film between adjacent steel wire winding layers, and each steel wire winding layer is composed of spirally wound steel wires;

The skeleton layer 15 selects steel wires with strength levels such as Ф0.8mmx3050MPa, Ф1.2mmx2750MPa, Ф1.4mmx2750MPa, Ф1.6mmx2450MPa, Ф1.8mmx2450MPa, Ф2.0mmx2250MPa, Ф2.2mmx2150MPa according to different specifications and pressure levels.

The inner side of the hose body is provided with an ultra-high molecular weight wear-resistant lining layer 17 to have strong high temperature resistance, oil resistance, corrosion resistance, wear resistance, self-lubrication and impact absorption properties.

The acid fracturing hose provided by the present invention is equipped with layer groups of specific materials, and the layer groups work synergistically to make the obtained acid fracturing hose have better comprehensive performance, that is, the mechanical properties, wear resistance, corrosion resistance and anti-leakage performance of the hose are all better.

A corrosion-resistant and anti-leakage layer 22 is provided between the inner rubber protective layer 18 and the skeleton layer 15; The anti-leakage layer has good chemical corrosion resistance, can effectively resist the erosion and penetration of the acid fracturing fluid to the anti-leakage layer, and improve the service life of the acid fracturing hose.

In specific production, the surface of the steel wire winding layer is provided with a brass coating, which is used to increase the bonding force between the steel wire and the rubber, that is, to increase the connection strength between the steel wire and the middle rubber layer; in addition, the coating itself is also suitable for plastic processing and can be used with The steel wire deforms at the same time and is conducive to drawing.

More specifically, the ultra-high molecular weight wear-resistant lining layer 17 includes 8 to 12 layers of film, and the thickness of a single layer of film is 0.15 mm; the thickness of the inner rubber protective layer 18 is 9 to 11 mm; the corrosion-resistant and anti-leakage layer 22 includes 4 to 6 layers of film, the thickness of the single layer film is 0.15mm; the thickness of the middle rubber layer is 0.3~0.6mm; the thickness of the outer rubber protective layer 8 is 2.5~4.0mm; the inner fiber cloth layer 19 and the outer fiber cloth layer 7 Both include several layers of cord fabric, and the thickness of a single layer of cord fabric is 0.8 to 1.2mm.

The embodiment of the present application also provides a method for preparing an acidified fracturing hose, which includes the following steps.

S1. Wrap the ultra-high molecular weight film around the core rod, and obtain the ultra-high molecular weight wear-resistant lining layer 17 through vulcanization and hot melting. This step makes the ultra-high molecular weight wear-resistant lining layer 17 have strong high temperature resistance, oil resistance, corrosion resistance, wear resistance, self-lubrication and impact absorption properties, improving the performance and life of the acidified fracturing hose.

S2. Press out the inner rubber on the ultra-high molecular weight wear-resistant lining layer 17 and cover it with the inner rubber protective layer 18.

S3. On the inner rubber protective layer 18, lay the corrosion-resistant and anti-leakage layer 22, the first middle rubber layer 23, the inner fiber cloth layer 19, the second middle rubber layer 21, the skeleton layer 15, and the twelfth middle rubber layer 24 in sequence. , outer fiber cloth layer 7 and outer rubber protective layer 8, the composite layer obtained. It should be noted that, similarly, the anti-leakage layer is provided so that the acidified fracturing hose has good chemical corrosion resistance and can effectively resist the erosion and penetration of the anti-leakage layer by the acidified fracturing fluid.

S4. Vulcanize the composite layer to obtain an acidified fracturing hose.

Optionally, the corrosion-resistant and anti-leakage layer 22, the first middle rubber layer 23, the inner fiber cloth layer 19, the second middle rubber layer 21, the skeleton layer 15, and the tenth layer are sequentially formed on the inner rubber protective layer 18. The second middle rubber layer 24, the outer fiber cloth layer 7 and the outer rubber protective layer 8 include the following steps.

S31. Lay the corrosion-resistant and anti-leakage layer 22 on the inner rubber protective layer 18;

S32. Wrap the first middle glue layer 23 and the inner fiber cloth layer 19 in sequence on the corrosion-resistant and anti-leakage layer 22, and evenly apply adhesive on the inner fiber cloth layer 19 after hot-melt vulcanization. Preferably, glue Chemlock 250 (model: chemllok) can be used as the agent.

S33. Wrap the second middle rubber layer 21, the skeleton layer 15, the twelfth middle rubber layer 24, the outer fiber cloth layer 7 and the outer rubber protective layer 8 in sequence on the inner fiber cloth layer 19.

Based on the above embodiment, the first ultra-high molecular weight film is wound around the core rod, and the ultra-high molecular weight wear-resistant lining layer 17 is produced by hot melting through vulcanization, which includes the following steps.

S11. Wrap the first ultra-high molecular weight film around the core rod, and obtain the ultra-high molecular weight wear-resistant lining layer 17 through vulcanization and hot melting. Among them, the vulcanization temperature is 145-155°C, and the vulcanization time is 30-40 minutes.

Applying Chemlock 250 evenly on the inner fiber cloth layer 19 after hot melt vulcanization includes the following steps.

S321. After hot-melt vulcanization, apply Chemlock 250 evenly on the inner fiber cloth layer 19, where the vulcanization temperature is 155-165°C and the vulcanization time is 10-15 minutes.

Vulcanizing the composite layer to obtain an acidified fracturing hose includes the following steps.

S41. Place the composite layer in an environment with an air pressure of 0.5 to 0.6 MPa, raise the temperature to 150 to 170°C, maintain the temperature for 1 hour, and then cool down to complete the vulcanization treatment and obtain an acidified fracturing hose.

Based on the above embodiment, the inner rubber protective layer 18 is compounded on the ultra-high molecular weight wear-resistant inner lining layer 17 . In the present invention, the inner rubber protective layer 18 is a natural styrene-butadiene rubber layer, and the inner rubber protective layer 18 includes the following raw materials in parts by weight:

20 to 26 parts of natural rubber; 50 to 60 parts of styrene-butadiene rubber; 15 to 20 parts of acrylic acid sodium salt ionomer; 3 to 8 parts of zinc oxide; 0.2 to 0.8 parts of sulfur; 6 to 8 parts of vulcanization accelerator; 68 to 72 parts of reinforcing agent; 15 to 20 parts of softener; 3 to 8 parts of tackifying resin; 1 to 5 parts of antioxidant; 0.1 to 0.5 parts of anti-scorch agent.

Example 1:

The inner rubber protective layer 18 includes the following raw materials in parts by weight: 20 parts of natural rubber; 50 parts of styrene-butadiene rubber; 15 parts of acrylic acid sodium salt ionomer; 3 parts of zinc oxide; 0.2 parts of sulfur; 6 parts of vulcanization accelerator; 68 parts of reinforcing agent; 15 parts of softener; 3 parts of tackifying resin; 1 part of antioxidant; 0.3 parts of anti-scorch agent.

Embodiment 2:

The inner rubber protective layer 18 includes the following raw materials in parts by weight: 24 parts of natural rubber; 58 parts of styrene-butadiene rubber; 18 parts of acrylic acid sodium salt ionomer; 5 parts of zinc oxide; 0.5 parts of sulfur; 7 parts of vulcanization accelerator; 70 parts of reinforcing agent; 18 parts of softener; 5 parts of tackifying resin; 3 parts of antioxidant; 0.2 parts anti-scorch agent.

Example 3:

The inner rubber protective layer 18 includes the following raw materials in parts by weight: 26 parts of natural rubber; 60 parts of styrene-butadiene rubber; 20 parts of acrylic acid sodium salt ionomer; 8 parts of zinc oxide; 0.8 parts of sulfur; 8 parts of vulcanization accelerator; 72 parts of reinforcing agent; 20 parts of softener; 8 parts of tackifying resin; 5 parts of antioxidant; 0.4 parts of anti-scorch agent.

In the above embodiment, specifically, the sodium acrylate ionomer polymer can be Surlyn 1802 produced by DuPont, the softener can be trioctyl trimellitate, and the tackifying resin can be phenolic resin or coumaron. resin.

In other implementations, the vulcanization accelerator includes the vulcanization accelerator MBS and the vulcanization accelerator TMTD, and the mass ratio of the vulcanization accelerator MBS to the vulcanization accelerator TMTD is 5:2 to 6:1.

In the above embodiment, the reinforcing agent includes carbon black N550 and carbon black N774, and the mass ratio of carbon black N550 to carbon black N774 is 3:2.

In the above embodiment, the antioxidant includes antioxidant 4020 and antioxidant MB, and the mass ratio of antioxidant 4020 and antioxidant MB is 7:3.

In addition, the preparation method of the inner rubber protective layer 18 includes the following steps:

S1. In parts by weight, weigh 20 to 26 parts of natural rubber, 50 to 60 parts of styrene-butadiene rubber, 15 to 20 parts of acrylic acid sodium salt ionomer, 3 to 8 parts of zinc oxide, and 68 to 72 parts of reinforcement. agent, 15 to 20 parts of softener, 1 to 5 parts of antioxidant, 3 to 8 parts of tackifying resin and 0.1 to 0.5 parts of anti-scorch agent.

S2. After mixing the above weighed raw materials evenly at 80 to 100°C, debind them below 110°C to obtain a degummed mixture.

S3. Mix the degummed mixture, 0.2 to 0.8 parts of sulfur and 6 to 8 parts of vulcanization accelerator at 86 to 88°C for 2 to 5 minutes to obtain the inner rubber protective layer.

In other embodiments of the present invention, a water cloth is wrapped around the vulcanized composite layer. The present invention has no special restrictions on the source of the water cloth, and it can be generally commercially available.

The function of the winding water cloth is as follows: the winding water cloth gives a certain pressure to the pipe body to prevent the rubber pipe body from excessive expansion during heating.

In other embodiments of the present invention, after the outer rubber protective layer 8 is laid, the armored stainless steel layer is placed on the outer rubber protective layer 8 .

In other embodiments of the present invention, after laying the outer rubber protective layer 8, the outer rubber protective layer 8 is also included. A nylon sheath layer is wrapped around the glue protective layer 8.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

The ultra-high pressure equal diameter acidizing fracturing hose assembly provided by the present invention has been introduced in detail above. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and the core idea of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of the claims of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (21)

1. An ultra-high pressure equal-diameter acid fracturing hose assembly, characterized in that it comprises a hose body and a metal joint; the metal joint comprises an inner tube (1), a first outer tube (2) for being sleeved on the outer side of the inner tube (1), a second outer tube (3) for being sleeved on the outer wall of the first outer tube (2), and a wire ring (4) for being threadedly connected to the inner end of the inner tube (1); the first outer tube (2) and the second outer tube (3) can be buckled separately; the outer wall of the wire ring (4) has an external clamping groove; the first outer tube (2) The end of the inner tube (1) has an inner card platform that matches the outer card groove, the inner end of the inner tube (1) has a connecting portion, the outer wall of the inner tube (1) has a first protrusion (6), and the inner wall of the first outer tube (2) has a second protrusion (5) for staggered engagement with the first protrusion (6), wherein when the metal joint is connected to the hose body, the hose body is clamped between the engaging surfaces of the first protrusion (6) and the second protrusion (5), and the inner wall of the second outer tube (3) has a plurality of small protrusions (13).
2. The ultra-high-pressure equal-diameter acidification fracturing hose assembly according to claim 1, characterized in that the outer wall of the inner tube (1) has an inverted eight-thorn boss (14), and the inverted eight-thorn boss The height of (14) is smaller than the height of the first protrusion (6), and the inverted eight-thorn boss (14) is provided on the side close to the port of the inner tube (1).
3. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 2, characterized in that the inner wall of the first outer tube (2) has a plurality of small rectangular bosses (12), and the small rectangular bosses (12) The height of the boss (12) is smaller than the height of the second boss (5), and the small rectangular boss (12) is disposed close to the port side of the first outer tube (2).
4. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 3, characterized in that the first protrusion (6), the second protrusion (5) and the small rectangular boss (12) are all With arc chamfer.
5. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 2, characterized in that the port of the inner pipe (1) is provided with a buffer slope and a straight platform buffer zone, and the buffer slope and The eight inverted thorn bosses (14) are connected together.
6. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 5, characterized in that when the second outer tube (3) is pressed against the outer wall of the inner tube (1), the inner tube The port of (1) extends an extension section (11) outward from the port position of the second outer tube (3). Buffer slopes and straight platform buffer areas are located at the extension section (11).
7. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to any one of claims 2 to 6, characterized in that the first protrusion (6) and the second protrusion (5), the small rectangular protrusion The platform (12) engages with the inner and outer surfaces of the skeleton layer (15) respectively.
8. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 7, characterized in that the first protrusion (6), the second protrusion (5) and the corresponding skeleton layer (15 ) The distance between the surfaces is 2-5mm;

   The outer diameter of the first outer tube (2) near the port is 2-4 mm smaller than the outer diameter near the wire ring (4).
9. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 7, characterized in that the inner wall of the hose body has a hose inner layer (9), and the inner diameter of the inner pipe (1) is equal to The inner diameter of the inner layer of the hose (9) is the same. When the hose body is connected to the metal joint, the inner tube (1) is embedded in the inner layer of the hose (9). The inverted eight-thorn boss (14) engages with the inner layer of the hose.
10. The ultra-high pressure equal diameter acidizing fracturing hose assembly according to claim 7, characterized in that the outer wall of the hose body has a hose outer layer (10), and the hose assembly further includes: located at The sealant (16) between the second outer tube (3) and the outer hose outer layer (10), the end surface of the hose outer layer (10) is in contact with the first outer tube (10) 2) The port end face.
11. An acidizing and fracturing hose, characterized in that it includes a hose body of an ultra-high-pressure equal-diameter acidizing and fracturing hose assembly according to any one of the above claims 1 to 10, and the skeleton layer (15) of the hose body ) includes multiple layers of steel wire wrapping layers arranged sequentially along the diameter direction of the hose body; wherein the innermost steel wire wrapping layer is the first layer of steel wire wrapping layers, and the steel wire wrapping layers of each odd-numbered layer of the steel wire wrapping layers The angles are all α, α is 53.0 to 54.0 degrees; and the steel wire strokes of the nth steel wire winding layer and the n-1th steel wire winding layer are equal, and n is an even number.
12. The acidification fracturing hose according to claim 11, characterized in that the hose body includes an ultra-high molecular weight wear-resistant inner lining layer (17), an inner rubber protective layer (18) arranged in sequence from the inside to the outside. The first middle glue layer (23), the inner fiber cloth layer (19), the second middle glue layer (21), the skeleton layer (15), the twelfth middle glue layer (24), the outer fiber cloth layer (7) and Outer rubber protective layer (8);

    Among them, the inner layer of the hose (9) is protected by an ultra-high molecular weight wear-resistant inner lining layer (17) and inner rubber. The protective layer (18) consists of;

    The outer layer (10) of the hose is composed of a twelfth middle rubber layer (24), an outer fiber cloth layer (7) and an outer rubber protective layer (8).
13. The acid fracturing hose according to claim 12, characterized in that a corrosion-resistant and anti-leakage layer (22) is provided between the inner rubber protective layer (18) and the skeleton layer (15).
14. The acid fracturing hose according to claim 12, wherein the surface of the steel wire winding layer is provided with a brass coating.
15. The acidified fracturing hose according to claim 12, characterized in that the ultra-high molecular weight wear-resistant lining layer (17) includes 8 to 12 layers of film, and the thickness of a single layer of film is 0.15mm;

    The thickness of the inner rubber protective layer (18) is 9 to 11 mm;

    The corrosion-resistant and anti-leakage layer (22) includes 4 to 6 layers of film, and the thickness of a single layer of film is 0.15mm;

    The thickness of the middle glue layer is 0.3~0.6mm;

    The thickness of the outer rubber protective layer (8) is 2.5~4.0mm;

    The inner fiber cloth layer (19) and the outer fiber cloth layer (7) each include several layers of cord fabric, and the thickness of a single layer of cord fabric is 0.8 to 1.2 mm.
16. A method for preparing acidified fracturing hose, which is characterized by including the following steps:

    The ultra-high molecular weight film is wound around the core rod, and the ultra-high molecular weight wear-resistant lining layer (17) is produced by hot melting through vulcanization;

    Press out the inner rubber on the ultra-high molecular weight wear-resistant lining layer (17) and cover it with the inner rubber protective layer (18);

    On the inner rubber protective layer (18), the corrosion-resistant and anti-leakage layer (22), the first middle rubber layer (23), the inner fiber cloth layer (19), the second middle rubber layer (21), and the skeleton layer ( 15), the twelfth middle rubber layer (24), the outer fiber cloth layer (7) and the outer rubber protective layer (8), the composite layer obtained;

    The composite layer is vulcanized to obtain an acidified fracturing hose.
17. The preparation method of acidified fracturing hose according to claim 16, characterized in that, on the inner rubber protective layer (18), a corrosion-resistant and anti-leakage layer (22), a first middle rubber layer ( 23), inner fiber cloth layer (19), second middle rubber layer (21), skeleton layer (15), twelfth middle rubber layer (24), outer fiber cloth layer (7) and outer rubber protective layer (8 ),include:

    Laying a corrosion-resistant and anti-leakage layer (22) on the inner rubber protective layer (18);

    The first middle rubber layer (23) and the inner fiber cloth layer are wound sequentially on the corrosion-resistant and anti-leakage layer (22). (19), and evenly apply adhesive on the inner fiber cloth layer (19) after hot melt vulcanization;

    On the inner fiber cloth layer (19), the second middle rubber layer (21), the skeleton layer (15), the twelfth middle rubber layer (24), the outer fiber cloth layer (7) and the outer rubber protective layer (8) are wound in sequence. ).
18. The preparation method of acidified fracturing hose according to claim 17, characterized in that the ultra-high molecular weight film is wound around the core rod and the ultra-high molecular weight wear-resistant lining layer (17) is obtained by vulcanization and hot melting. ,include:

    The first ultra-high molecular weight film is wound around the core rod, and the ultra-high molecular weight wear-resistant lining layer (17) is obtained by hot melting through vulcanization; wherein the vulcanization temperature is 145-155°C, and the vulcanization time is 30-40 minutes;

    The method of uniformly applying adhesive on the inner fiber cloth layer after hot melt vulcanization includes:

    And after hot-melt vulcanization, apply adhesive evenly on the inner fiber cloth layer, where the vulcanization temperature is 155-165°C and the vulcanization time is 10-15 minutes;

    The composite layer is vulcanized to obtain an acidified fracturing hose, including:

    The composite layer is placed in an environment with an air pressure of 0.5 to 0.6 MPa, heated to 150 to 170°C, kept for 1 hour, and then cooled to complete the vulcanization process and obtain an acidified fracturing hose.
19. The method for preparing an acidified fracturing hose according to claim 17, further comprising preparing the inner rubber protective layer (18) according to the following raw materials in parts by weight:

    20 to 26 parts of natural rubber;

    50-60 parts of styrene-butadiene rubber;

    15 to 20 parts of acrylic acid sodium salt ionomer;

    3-8 parts of zinc oxide;

    0.2 to 0.8 parts of sulfur;

    6 to 8 parts of vulcanization accelerator;

    68 to 72 servings of reinforcing agent;

    15 to 20 parts softener;

    3 to 8 parts of tackifying resin;

    1 to 5 parts of antioxidant;

    0.1 to 0.5 parts of anti-scorch agent.
20. The method for preparing an acidified fracturing hose according to claim 17, further comprising preparing the inner rubber protective layer (18) according to the following raw materials in parts by weight:

    24 parts natural rubber;

    58 parts styrene-butadiene rubber;

    18 parts of acrylic acid sodium salt ionomer;

    5 parts zinc oxide;

    0.5 part sulfur;

    7 parts vulcanization accelerator;

    70 parts of reinforcing agent;

    18 parts softener;

    5 parts tackifying resin;

    3 parts antioxidant;

    0.3 parts anti-scorch agent.
21. The preparation method of acidified fracturing hose according to claim 19, characterized in that preparing the inner rubber protective layer (18) includes:

    In parts by weight, weigh 20 to 26 parts of natural rubber, 50 to 60 parts of styrene-butadiene rubber, 15 to 20 parts of acrylic acid sodium salt ionomer, 3 to 8 parts of zinc oxide, 68 to 72 parts of reinforcing agent, 15 to 20 parts of softener, 1 to 5 parts of antioxidant, 3 to 8 parts of tackifying resin and 0.1 to 0.5 parts of anti-scorch agent;

    After mixing the above weighed raw materials evenly at 80-100°C, debind them below 110°C to obtain a degummed mixture;

    The degummed mixture, 0.2 to 0.8 parts of sulfur and 6 to 8 parts of vulcanization accelerator are kneaded at 86 to 88°C for 2 to 5 minutes to obtain the inner rubber protective layer (18).