Search

CN-121993052-A - Multilayer rubber combined sleeve for preventing sleeve deformation and preparation method thereof

CN121993052ACN 121993052 ACN121993052 ACN 121993052ACN-121993052-A

Abstract

The invention relates to a multilayer rubber combined sleeve for preventing sleeve deformation and a preparation method thereof, the multilayer rubber combined sleeve comprises a sleeve body and a rubber combined layer, the rubber combination layer is vulcanized and fixed on the outer side wall of the sleeve body, and comprises a plurality of layers of rubber layers which are sequentially laminated and fixed from inside to outside, and the water absorption expansion rate of the plurality of layers of rubber layers is sequentially increased from inside to outside. The multilayer rubber combined sleeve for preventing sleeve deformation disclosed by the invention has the advantages that the expansibility and the pressure bearing property of the rubber layer are taken into account, the problem of fluid channeling in the fracturing process caused by insufficient pressure bearing after expansion of the traditional sleeve is solved, meanwhile, the surface layer is treated, the rubber layer is effectively prevented from being expanded in advance before entering a well, and the site safety construction is ensured. According to the invention, by designing a plurality of rubber layers with different expansion rates, the contradiction between the expansion property and the pressure bearing property is solved, and the high pressure bearing property of the rubber layer can be realized while the high expansion property of the rubber is ensured.

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
20260508
Application Date
20241108

Claims (10)

  1. 1. The utility model provides a multilayer rubber combination sleeve pipe that prevention sleeve pipe warp, its characterized in that includes sleeve pipe body and rubber combination layer, the rubber combination layer is vulcanized and is fixed on the lateral wall of sleeve pipe body, the rubber combination layer includes from interior to outside stacks gradually fixed multilayer rubber layer, and the rate of expansion of water absorption of multilayer rubber layer increases from interior to outside in proper order.
  2. 2. The multi-layer rubber combined sleeve for preventing sleeve deformation according to claim 1, wherein the thickness of the multi-layer rubber layer is gradually increased from inside to outside, the thickness difference between two adjacent rubber layers is 1-2 mm, or the thickness of the outermost rubber layer in the multi-layer rubber layer is the smallest, and the thicknesses of the other rubber layers are equal.
  3. 3. The multi-layer rubber composite sleeve for preventing sleeve deformation according to claim 1, wherein the rubber composite layer comprises 2-4 rubber layers.
  4. 4. The multi-layer rubber combined sleeve for preventing sleeve deformation according to claim 1, wherein the total thickness of the rubber combined layers is 12-30 mm, and the thickness of the outermost layer of the multi-layer rubber layers is 4-6 mm.
  5. 5. A multi-layered rubber composite sleeve for preventing deformation of a sleeve according to any one of claims 1 to 4, wherein a plurality of layers of a lipophilic net material are embedded in the rubber composite layer, and the plurality of layers of the lipophilic net material are disposed in the rubber composite layer at equal intervals.
  6. 6. The multi-layer rubber combined sleeve for preventing sleeve deformation according to claim 5, wherein the interval between two adjacent layers of the hydrophilic net material is 2-3 mm, the hydrophilic net material layer is cord fabric, the thickness of the cord fabric is 0.5-1 mm, and the mesh number of the cord fabric is 40-100 meshes.
  7. 7. The multi-layer rubber composite sleeve for preventing deformation of a sleeve according to claim 5, wherein a plurality of groups of counter bores distributed annularly along the outer peripheral side of the sleeve body are arranged in the rubber composite layer, and the counter bores penetrate through the multi-layer rubber layer and the multi-layer rubberized reticular material layer.
  8. 8. The multi-layer rubber combined sleeve for preventing sleeve deformation according to claim 7, wherein the diameters of the counter bores are 10-20 mm, the ring spacing of the plurality of groups of counter bores is 50-100 mm, and the number of counter bores in each group of counter bores is 30-40.
  9. 9. The multi-layer rubber combined sleeve for preventing sleeve deformation according to claim 1, wherein a waterproof layer is further arranged on the outer side wall of the rubber combined layer, and the thickness of the waterproof layer is 1-3 mm.
  10. 10. A method for producing a multilayer rubber composite bushing for preventing deformation of a bushing according to any one of claims 6 to 9, characterized by comprising the steps of: S1, carrying out surface pretreatment on the surface of a sleeve body; s2, wrapping a plurality of rubber layers on the surface of the sleeve body, arranging a rubberized reticular material layer at intervals, and placing an adhesive between the rubberized reticular material layer and the rubber layers and between the rubber layers and the sleeve body; S3, vulcanizing the multi-layer rubber layer to firmly bond the rubber layer with the sleeve body, the adjacent rubber layers and the rubberized reticular material layer; s4, after the vulcanization of the whole rubber combination layer is completed, punching operation is carried out on the outer surface of the rubber combination layer; and S5, after the punching is completed, uniformly spraying waterproof materials on the outer surface of the rubber combination layer to obtain the multi-layer rubber combination sleeve.

Description

Multilayer 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 development, in particular to a multilayer rubber combined sleeve for preventing sleeve deformation and a preparation method thereof. Background At present, the sleeve is deformed to different degrees in the shale oil development process, and particularly the sleeve deformation problem is more remarkable along with the shale gas moving to a deep region, 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 cutting of the oil 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 CN115822509A, 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. Aiming at the technical thought, the existing developed rubber sleeve combined structure is simpler, and has the following two problems that firstly, when the expansion characteristic is considered to absorb stratum displacement, the pressure-bearing characteristic is not considered, if the strength is insufficient after expansion, annulus tightness is insufficient, and the integrity of a shaft is affected during fracturing. The staged fracturing process of the horizontal well is to isolate horizontal well sections by using bridge plugs, and each section is perforated by multiple clusters, so that fracturing fluid can enter the stratum from multiple perforations to form a fracture network. If the rubber bearing capacity is insufficient, the sealing performance of the shaft is poor, and in the fracturing process, high-pressure fluid easily flows along the rubber layer, so that fluid channeling occurs among clusters and among sections, and the fracturing effect and the