Sand ratio detection method for fracturing operation of oil and gas exploitation

Abstract

The invention relates to a sand ratio detection method for a fracturing operation of oil and gas exploitation and belongs to the technical field of oil and gas drilling exploitation. According to the sand ratio detection method for the fracturing operation of oil and gas exploitation, a sand mixing trolley inlet fluid flowmeter is installed at a sand mixing trolley fluid inlet position, a sand mixing trolley outlet fluid flowmeter is installed at a sand mixing trolley fluid outlet position, a sand mixing trolley and a fracturing pump trolley are connected at the sand mixing trolley fluid outlet position, and the sand ratio is calculated according to the detected sand mixing trolley inlet fluid flow and the sand mixing trolley outlet fluid flow. By means of the method, the problems that in prior art, the personal safety and the environment are affected, usage and management require specially-assigned full-time staffs, and usage costs are extremely high due to the fact that radioactive materials are necessarily used when a nuclear densimeter is used to directly detect fluid density are solved, and the problem of low detection precision caused by the fact that flowmeters are used to detect the sand mixing trolley inlet fluid flow and theoretical flows of input sand and other solid particles are calculated through detecting rotating speed of a sand feeding stirring cage to calculate the sand ratio is solved. The sand ratio detection method for the fracturing operation of oil and gas exploitation has the advantages that the detecting precision is high, the using costs are low, and environment and personal safety are not affected.

Description

technical field [0001] The invention relates to a sand ratio detection method for fracturing operations in the exploitation of oil, oil and natural gas, and coal-bed methane, and belongs to the technical field of drilling and production of oil, oil and natural gas, and coal-bed methane. Background technique [0002] In the process of oil and gas recovery, such as oil and gas, coal bed methane, etc., in order to improve the recovery rate of oil and gas wells, it is necessary to reform low-permeability oil and gas reservoirs and develop deep oil and gas reservoirs through fracturing operations. The fracturing process is to use high-pressure fluid (fracturing fluid, etc.) to create fractures or expand original cracks in the production layer at the bottom of the well, and then fill them with proppant (sand or other solid particles) to form a high-permeability area. Generally, high-pressure fluid is divided into prefluid and sand-carrying fluid. Prefluid is a fluid without sand a...

AI Technical Summary

Problems solved by technology

In the prior art, there are generally two methods for detecting the sand ratio: the first method is to install a nuclear density meter at the output port of the sand mixing equipment to directly detect the fluid density, and then convert it into sand ratio. This method has high detection accuracy, but the nuclear density The meter itself is not only expensive, but also because of the use of radioactive materials, one affects personal safety and the environment, and the cost of using the two is also extremely high. Special personnel are dedicated to use and manage them full-time, and even if they are scrapped, they must be kept permanently; The inlet fluid flow rate of the sand mixing equipment is detected by the encoder or other sensors to detect the rotational speed of the sand mixing cage to calculate the theoretical input of the input sand and other solid particles, and then calculate the sand ratio. This method is cheap to detect equipment, but due to When the sand and other solid particles are lifted by the sand mixing cage, the actual lifting amount is affected by the nonlinear relationship between the speed and the lifting amount, the size of the sand and other solid particles, the difference in physical state such as moisture, the sand storage condition of the sand storage tank, the stirring Influenced by factors such as the cage's own state, the detection accuracy is very low, and it is difficult to meet the needs of actual use.

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