Let's get down to business. Your plan is feasible, but the problem is that you need an invitation letter from Sinopec first. I don't know which company your husband works for. At present, I have observed that Sinopec has no family members here and has not visited their families ... Maybe your husband is a leader, which is feasible, so the next problem is that your marriage certificate has to be notarized at the embassy, otherwise your marriage relationship in Saudi Arabia will not be recognized, as everyone who has been to Saudi Arabia knows.
If there is no notarization, you come ... you go out together, or stay in a hotel or something. It is very dangerous, and you will be caught by the police, and you will be considered as ... and the consequences will be very serious.
As for what visa to apply for, Beijing has it, and Sinopec has designated it. If you need more information, please leave a message.