Study On Hydrogenated Nitrile Rubber Modified By Degradable Crosslinking Rubber And Rubber Plastic Blending

"Degradation" generally refers to the reduction of the number of carbon atoms and molecular weight in the molecules of organic compounds.The degradable rubber studied in this paper mainly refers to the decline of physical properties and deterioration of various properties of the polymer after treatment under the action of physical and chemical factors under specific conditions.Typical manifestations are: brittle,fracture,softening,hardening,loss of mechanical strength,etc.In this paper,a kind of "degradable rubber" material is prepared by chemical modification and physical blending of rubber.On the one hand,it can be applied to the open hole packer to improve the problems of difficult unsealing and post-treatment of the rubber barrel of the open hole packer.On the other hand,the preparation of "reversibility" of cross-linking bond of rubber material is explored to realize the recycling of waste rubber and solve the problems of resource waste and environmental pollution.As a common tool in downhole production,open hole packer not only plays a very important sealing role in the development and production of oil and gas wells,but also further promotes the implementation and development of various downhole processes.However,for long-term work,there is the risk of pipe string sticking,which increases the later workover consumption and secondary completion cost.In order to solve the problem that the open hole packer is not easy to unseal and the post-treatment is difficult in the process of deep oil and gas development in Shunbei 1 area,the research on the degradable rubber barrel in the soluble open hole packer is carried out to form a set of completion technology that is easy to drill and remove the open hole packer and solve the difficult problem of workover.The experimental scheme of this paper is: the feasibility study of designing "degradable rubber" is divided into two ideas.The chemical modification method and physical modification method choose styrene butadiene rubber(SBR)and hydrogenated nitrile butadiene rubber(HNBR)as the matrix to explore their properties respectively.First,the vulcanized cross-linking bond in the rubber is replaced by a controllable cross-linking bond by chemical modification.After treatment under specific conditions,the cross-linking bond can be broken,and the three-dimensional network cross-linking structure of the rubber becomes simple.The linear structure,the mechanical strength performance is reduced,and the purpose of "degradable" is achieved,and it is analyzed and studied to select the best formula ratio.Second,through the method of physical blending,a variety of degradable materials are modified with rubber by melt blending method to prepare a blended "degradable rubber" and analyze and study the blending of different degradable materials and rubber.After the performance changes,the optimal formula ratio of degradable material and rubber was selected.The results show that the three kinds of modified rubber prepared in this paper can achieve degradable effect under specific conditions,among which PLA / HNBR modified rubber and PCL / HNBR modified rubber can meet the performance requirements in the application of simulated actual scenes Under the experimental conditions,the tensile strength of PLA / HNBR modified rubber can reach 21.59 MPa,the elongation at break can reach 558.47%,and the degradation degree can reach 17.91%;The highest tensile strength of PCL / HNBR can reach 20.27 MPa,the highest elongation at break can reach487.11%,and the highest degradation degree can reach 22.16%.It shows that the mechanical properties of the material are not affected when the degradation performance of the material is improved.The material studied in this paper is used to improve the open hole packer,which mainly solves the problem of difficult removal of rubber barrel and reduces the cost.It has provided strong support for Sinopec’s western energy deployment and created remarkable benefits.It provides more reference directions for the research,development and application of degradable rubber in the future.