High-temperature high-pressure well cementation additive

Abstract

The invention discloses a high-temperature high-pressure well cementation additive. The high-temperature high-pressure well cementation additive comprises a component A and a component B, the component A comprises, by weight, 20 parts of a water reducing agent, 5 parts of hydroxyethyl bisphosphonic acid, 1 part of zeolite powder and 30 parts of water, and the component B comprises, by weight, 5 parts of coconut shell powder, 0.5 part of sugarcane powder, 3 parts of sodium carboxymethylcellulose, 2 parts of zinc acrylate, 5 parts of polyvinylpyrrolidone and 200 parts of water. A method for preparing the coconut shell powder comprises the steps that a 4 M sulphuric acid aqueous solution 10 times of the total mass of smashed materials is added to the smashed materials, soaking is carried outfor 2 h, the smashed materials are placed in a vacuum drying box of 120 DEG C to be dried, and pre-treated coconut shell residues are obtained; ethyl alcohol, a titanate coupling agent and potassium hydroxide are added to the pre-treated coconut shell powder, the materials are mixed, recirculation is carried out for 6 h, the materials are placed in the vacuum drying box of 120 DEG C to be dried, smashing is carried out, and the coconut shell powder is obtained. According to the high-temperature high-pressure well cementation additive, by means of the joint action of the component A and the component B, the thickening time of the cement mud is effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation. More specifically, the present invention relates to a high temperature and high pressure well cementing additive. Background technique [0002] Cementing engineering is an important link in the drilling and completion process of oil and gas wells. Cement slurry cementing technology refers to injecting cement into the annular space between the well wall and casing, and achieving the sealing effect through cement. The quality of cementing determines the productivity of oil and gas layers and the life of oil and gas wells. At present, with oil and gas exploration and development gradually extending to the depth of the formation, the corresponding formation temperature gradually increases, and the focus of oil and gas field development gradually shifts to deep wells, ultra-deep wells and other large temperature difference cementing. However, with the increase of temperature in high te...

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Problems solved by technology

At present, with oil and gas exploration and development gradually extending to the depth of the formation, the corresponding formation temperature gradually increases, and the focus of oil and gas field development gradually shifts to deep wells, ultra-deep wells and other large temperature difference cementing. However, with the increase of temperature in high temperature cementing, the cement Slurry thickens quickly, which seriously affects the normal construction of cementing operations