CN-122014121-A - Rubber combined sleeve for preventing sleeve deformation and preparation method thereof

Abstract

The invention relates to a rubber combined sleeve for preventing sleeve deformation and a preparation method thereof, wherein the rubber combined sleeve for preventing sleeve deformation comprises a sleeve body and a rubber layer, two sections of rubber layers are fixed on the outer side wall of the sleeve body through vulcanization, the two sections of rubber layers are arranged at intervals along the axial direction of the sleeve body, the interval formed between the two sections of rubber layers is a first blank section, and the first blank section is positioned in the middle position of the sleeve body; the outer side wall of the rubber layer is provided with a plurality of grooves which are arranged at intervals along the circumferential direction of the sleeve body, the grooves are arranged along the axial direction of the sleeve body in an extending mode, rubber ribs are formed between two adjacent grooves, and the outer side wall of each rubber rib is sequentially provided with a heat insulation layer and a wear-resistant layer. According to the invention, the rubber layer with the grooves is arranged, and the heat insulation layer is sprayed on the protruding part contacted with the well wall, so that the rubber is prevented from softening in a high-temperature well shaft environment. And spraying a wear-resistant layer on the outermost layer of the rubber layer to protect the rubber layer from being worn due to contact with a well wall in the running-in process.

Inventors

• TAN PENG
• FENG XIAO
• YANG ZIXUAN
• MEI XUAN
• SUN XINYI
• CHEN CHAOWEI
• ZHAO QING
• CAO JIAWEI
• LIU JIHAN
• WANG ZIQIANG
• WANG QIAN
• LIU WEI
• ZHAI WENBAO

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团工程技术研究院有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (10)

1. 1. A rubber combined sleeve for preventing deformation of a sleeve is characterized by comprising a sleeve body and rubber layers, wherein two sections of rubber layers are fixed on the outer side wall of the sleeve body through vulcanization, the two sections of rubber layers are arranged at intervals along the axial direction of the sleeve body, the interval formed between the two sections of rubber layers is a first blank section, the first blank section is located at the middle position of the sleeve body, a plurality of grooves which are arranged at intervals along the circumferential direction of the sleeve body are formed in the outer side wall of the rubber layer, the grooves extend along the axial direction of the sleeve body, rubber ribs are formed between the two adjacent grooves, and a heat insulation layer and a wear-resisting layer are sequentially arranged on the outer peripheral side wall of the rubber ribs.
2. 2. The rubber composite sleeve for preventing deformation of a sleeve according to claim 1, wherein both ends in a longitudinal direction of the groove are respectively disposed through the rubber layers.
3. 3. The rubber composite sleeve for preventing deformation of a sleeve according to claim 1, wherein the grooves are linear grooves or spiral grooves, and the helix angle of the spiral grooves is 15-30 degrees.
4. 4. The rubber combined sleeve for preventing sleeve deformation according to claim 1, wherein the cross section of the groove is of a fan-shaped structure, the width of an outer end groove of the fan-shaped structure is 10-20 mm, the width of an inner end groove of the fan-shaped structure is 5-10 mm, and the thickness of a notch of the groove is 5-10 mm.
5. 5. The rubber combined sleeve for preventing sleeve deformation according to claim 1, wherein the width of the peripheral side wall of the rubber rib is 80-90 mm.
6. 6. The rubber composite sleeve for preventing deformation of a sleeve according to claim 1, wherein a second blank is formed between one rubber layer and an end face of an adjacent sleeve body, and a third blank is formed between the other rubber layer and the other end face of the adjacent sleeve body.
7. 7. The rubber composite sleeve for preventing deformation of a sleeve according to claim 6, wherein the length of the first blank section is 0.5m to 1m, the length of the second blank section is 0.5m to 0.8m, and the length of the third blank section is 0.5m to 0.8m.
8. 8. The rubber combined sleeve for preventing sleeve deformation according to claim 1, wherein the thickness of the rubber layer is 10-20 mm, the thickness of the heat insulation layer is 0.3-0.8 mm, the thickness of the wear-resistant layer is 0.3-1 mm, and the sum of the thickness of the heat insulation layer and the thickness of the wear-resistant layer is not more than 1-1.5 mm.
9. 9. The rubber composite sleeve for preventing deformation of a sleeve according to claim 1, wherein a drawing test value of the heat insulating layer is not less than 10Mpa, a drawing test value of the wear-resistant layer is not less than 10Mpa, a shore hardness of the wear-resistant layer is not less than 50D, a tear strength of the wear-resistant layer is not less than 120N/mm, and a tensile strength of the wear-resistant layer is not less than 25Mpa.
10. 10. A method for producing a rubber composite bushing for preventing deformation of a bushing according to any one of claims 1 to 9, comprising the steps of: S1, carrying out surface pretreatment on the surface of a sleeve body; S2, wrapping two sections of rubber layers on the surface of the sleeve body, so that a first blank section is reserved between the two sections of rubber layers, and a second blank section and a third blank section are reserved at two ends of the sleeve body respectively; S3, vulcanizing the rubber layer to firmly bond the rubber layer and the sleeve body; S4, shielding the outer side wall of the vulcanized rubber layer by using a shielding object with the same shape as the length direction of the groove according to the related design requirements of the groove, spraying a heat insulation material on the outer side wall of the rubber layer, curing to form a heat insulation layer, spraying a wear-resistant material on the heat insulation layer, and curing to form a wear-resistant layer; S5, removing the shielding object on the outer side wall of the rubber layer, exposing the rubber layer which is not sprayed and carrying out groove cutting operation to obtain the rubber combined sleeve.

Description

Rubber combined sleeve for preventing sleeve deformation and preparation method thereof Technical Field The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a rubber combined sleeve for preventing sleeve deformation and a preparation method thereof. Background At present, the sleeve is deformed to different degrees in the development process of Sichuan shale gas, xinjiang Ji-Texal shale oil and Dagang oilfield shale oil in China, and particularly, as the shale gas goes to a deep region, the sleeve deformation problem is more remarkable, so that the fracturing construction cost and difficulty are increased, the number of fracturing stages is reduced, and serious consequences such as low single well yield, short well life cycle and the like are caused. Regarding the reasons for casing deformation in the fracturing process, chen Chaowei, xiang Degui and the like propose a fluid channel-fault activation model through analysis of a large amount of field data, and reveal the mechanism of casing deformation of shale oil and gas reservoirs, namely, the casing deformation is caused by the fact that fracture is induced to generate dislocation in the hydraulic fracturing construction process due to the development of a fracture system of shale oil and gas reservoirs, and shear displacement generated by the fracture dislocation directly acts on the casing. On the other hand, the statistical analysis of the field data shows that the deformation of the casing is limited, the main body is distributed in the range of 15-25mm, and the shearing of the oil-bearing casing is not caused. Because fracture dislocation belongs to displacement loading, the dislocation force approaches infinity, and measures such as increasing the steel grade and the wall thickness of the sleeve conventionally are adopted, the problem of deformation of the sleeve cannot be fundamentally solved. In order to prevent the problem of casing deformation during fracturing, xiang Degui and Chen Chaowei et al propose the concept of "in soft g" and middle petroleum engineering researchers developed a rubber composite casing consisting mainly of a casing and a water-swellable rubber casing located outside the casing (patent CN212671582U, CN207177747U, CN 106761443B). The concrete idea is that an elastic rubber cylinder is added on the outer layer of the sleeve, namely, the rubber combined sleeve is put in. And in the high-risk well section with sliding fracture, the rubber combined sleeve is put in, and in the fracturing process, if the sliding fracture occurs, the rubber of the outer layer can absorb the sliding displacement of the fracture, so that the sleeve of the inner layer is protected from being influenced. Because the rubber cylinder is added outside the casing, the resistance of casing running is increased, and in order to reduce the resistance in the casing running process, special rubber which does not expand when meeting oil and expands when meeting water is adopted, so that the expansion is avoided when the casing is run in an oil-based environment, the safe running is ensured, the water is absorbed and expanded in the thickening process of well cementation cement paste after the casing running is completed, the thickness of the rubber is further increased, and the capacity of absorbing displacement load of the rubber is increased to the maximum extent. On the basis, in order to increase the water absorption effect of rubber, a rubber combined sleeve with alternate slots is designed in the patent CN 115822509A, in order to prevent the rubber layer from being damaged on an irregular well wall in the process of being put down, a self-expansion rubber combined sleeve for preventing damage is designed in the patent CN118110430A by adding a soluble cover body, and in order to prevent the rubber layer from being excessively expanded, a rubber combined sleeve for preventing excessive expansion is designed in the patent CN118088067A by designing an elastic protection cover and a use method thereof. However, as the depth of burial of the hydrocarbon reservoirs increases, so does the reservoir temperature, deep shale hydrocarbon temperatures generally are greater than 130 ℃. Under the high temperature condition, rubber is easy to soften, so that the existing rubber combined sleeve has the risk of being unable to safely fall in a high temperature environment. In addition, the casing is easy to bend and deform in the process of running the casing into the ultra-long well, particularly in the deflecting section and the horizontal section, friction resistance is increased, so that the rubber layer is in contact friction with the well wall locally, and the resistance of the tubular column and the running difficulty are further increased. Therefore, there is a need to design a high-temperature-resistant and high-strength rubber combined sleeve, which can not only resist high temperature and maintain high streng