Oil well cement slurry high-temperature suspension stabilizer prepared from oil-based shale drilling cuttings

Patent metadata

Field	Value
Publication number	US-11345844-B2
Application number	US-202016887336-A
Country	US
Kind code	B2
Filing date	May 29, 2020
Priority date	Jun 12, 2019
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

An oil well cement slurry high-temperature suspension stabilizer prepared from oil-based shale drilling cuttings is provided. The high-temperature suspension stabilizer is reasonable in principle, inexpensive and easily available in raw materials, high in product uniformity and good in chemical stability. Meanwhile, waste is changed into wealth. Therefore, the high-temperature suspension stabilizer is environment-friendly and has a broad industrial application prospect.

First claim

What is claimed is:

1. An oil well cement slurry suspension stabilizer prepared from oil-based shale drilling cuttings by a method comprising the following steps:
(1) performing preliminary pyrolysis on the oil-based shale drilling cuttings produced from a shale formation in a pyrolysis furnace under a heating program in an air atmosphere in which the temperature is raised from room temperature to 350-400° C., the heating time is 30-45 min; then the temperature is preserved at 350-400° C., and the heat preservation time is 75-90 min; grinding the oil-based shale drilling cuttings after the preliminary pyrolysis and controlling a specific surface area of particle size after grinding to 200-300 m 2 /Kg; and
(2) placing the oil-based shale drilling cuttings after the preliminary pyrolysis and grinding in a corundum crucible and putting the corundum crucible in a resistance furnace, and performing heat treatment for a second time under conditions as follows: the temperature is raised from room temperature to 800° C., the heating time is 45-60 min; then the temperature is preserved at 800° C., and the heat preservation time is 60-75 min; then the temperature is continuously raised to 1000° C., and the heating time is 30-45 min; then the temperature is preserved at 1000° C., and the heat preservation time is 60-90 min; then, cooling in a quenching and shock cooling manner, drying at 60° C. for 24 h, and grinding to obtain powder having a specific surface area of 400 m 2 /Kg, thereby which the oil well cement slurry suspension stabilizer is prepared.

2. The oil well cement slurry suspension stabilizer prepared from oil-based shale drilling cuttings according to claim 1 , wherein the oil-based shale drilling cuttings are drilling cuttings produced when natural gas is extracted by drilling in an oily drilling fluid environment in a shale formation.

3. The oil well cement slurry suspension stabilizer prepared from oil-based shale drilling cuttings according to claim 2 , wherein the oil-based shale drilling cuttings are taken from black shale of a Silurian Longmaxi Formation.

4. The oil well cement slurry suspension stabilizer prepared from oil-based shale drilling cuttings according to claim 1 , wherein, in the quenching and shock cooling process, water or liquid nitrogen is used as a quenching medium.

Assignees

• Univ Southwest Petroleum
• Southwest Petroleum Univ Environmental Protection Technology Chengdu Co Ltd
• Southwest Petroleum Univ Enviormental Protection Technology Chengdu Co Ltd

Inventors

• Cheng Xiaowei
• Zhang Gaoyin
• Luo Shunxiang
• Chen Zuwei
• Huang Sheng
• Liu Kaiqiang
• Zhang Chunmei
• Mei kaiyuan
• Liu Jian
• Li Zaoyuan
• Guo Xiaoyang

Classifications

• C04B18/023

  Fired or melted materials · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B18/125

  Slate residues, e.g. colliery shale or oil shale or oil shale ash · CPC title

• C04B20/026

  Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos · CPC title