A Cementing-Formation Solidification Integrated Fluid Applied to Deep Water Weakly Consolidated Formation

Abstract

The invention provides well cementation and formation solidification integrated liquid applied to a deepwater weakly consolidated formation. The well cementation and formation solidification integrated liquid applied to the deepwater weakly consolidated formation is characterized by comprising the following components in parts by weight: 100 parts of superfine granulated blast furnace slag, 5 to 40 parts of resin, 5 to 30 parts of hollow glass beads, 2 to 8 parts of sodium hydroxide or potassium hydroxide, 0.2 to 1 part of a silane coupling agent and 70 to 100 parts of water. The 24-hour compressive strength of the well cementation and formation solidification integrated liquid system is 3.5 MPa or higher; after the coupling agent, the hollow glass beads and the resin are added, the coagulation time of the integrated liquid system is greatly prolonged, the thickening time is 2 hours or longer and the flowability is 20 cm or larger. Meanwhile, the well cementation and formation solidification integrated liquid has high solidification effect on mud clay. Through addition of the hollow glass beads and increment of a water cement ratio, the flowability of slurry is enhanced and the coagulation time of the slurry is prolonged.

Description

technical field [0001] The invention belongs to the technical field of well cementing in deep-water weakly cemented formations, and in particular relates to a slag-resin-based solidifying liquid for well cementing in deep-water weakly cemented formations. Background technique [0002] In recent years, with the advancement of offshore drilling and production technology, my country's offshore oil industry has entered the deep-water era. In addition to deep-water offshore oil equipment, technology, and tools, deep-water cementing technology is to ensure the safe construction and long-term maintenance of deep-water offshore oil and gas drilling wells. One of the key technologies of life. Among them, whether deep-water weakly cemented formations can be effectively sealed for a long time is facing more challenges. For deep water cementing, the compaction conditions and temperature characteristics of deep formations are similar to those of conventional land or shallow sea formation...

AI Technical Summary

Problems solved by technology

However, solidifying the formation while solidifying the annulus will make it difficult to implement the injection process of the solidified grout. The main system is in the following three points: 1. If the conventional grouting reinforcement technology is used to pump the solidified grout into the grouting pipe, the placement and recovery of the grouting pipe Difficult to solve

2. If the solidified slurry is used to wash the formation in the annular space by means of pressurized circulation, it is difficult to ensure the contact time between the solidified slurry and the formation, and the good effect of fully solidifying the target layer cannot be achieved.

3. If the solidified slurry is added to the cement slurry, due to the difference in properties between the solidified slurry and the cement slurry, the hydration of the cement slurry will be greatly affected, thereby affecting the cementing quality of the weakly cemented formation

However, the existing technology cannot achieve a good curing effect on the formation on the basis of meeting the requirements of cementing construction.

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