Formation fluid pumping method
A formation fluid and pumping technology, used in earth-moving drilling, wellbore/well components, etc., can solve the problems of time-consuming, failure to achieve the purpose of reservoir evaluation, and long wellbore soaking time.
Active Publication Date: 2022-05-20
SHENZHEN BRANCH CHINA NAT OFFSHORE OIL CORP
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Problems solved by technology
Due to the influence of formation fluid viscosity, the pumping and sampling operation is often time-consuming and fails to achieve the purpose of reservoir evaluation, and the eastern part of the South China Sea experiences typhoons every year, resulting in a longer time for the wellbore to be soaked in mud, which increases the difficulty of pumping
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[0019] refer to figure 1 , the formation fluid pumping method of the present invention may comprise the following steps:
[0020] S1. According to the pumping data of the adjacent well, fit and reproduce the dynamic process of mud invasion and pumping to obtain the empty volume of the filtrate; obtain the reservoir permeability according to the pumping pressure drop and flow rate of the adjacent well;
[0021] Before the step S1, according to the stratum to be pumped, first determine the adjacent wells that have been pumped and have similar geological deposits and lithology in the area where they are located.
[0022] Pumping data includes pumping pressure drop, pump displacement, reservoir permeability, fluid viscosity and formation pressure. The RCI slim software based on the Buckley-Leverett immiscible flooding theory, according to the existing pumping pressure drop, pump displacement, reservoir permeability, fluid viscosity and formation pressure of the adjacent well, per...
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The invention discloses a pumping method for formation fluid, comprising the following steps: S1. According to the pumping data of the adjacent well, fitting and reproducing the dynamic process of mud invasion and pumping to obtain the emptied volume of the filtrate; according to the pumping data of the adjacent well The pressure drop and flow velocity are fitted to obtain the reservoir permeability; S2, according to the filtrate emptied volume obtained by fitting in step S1, the numerical value of the fluid viscosity is adjusted to obtain the relationship curve between the filtrate emptied volume and the fluid viscosity; S3, the filtrate of the formation to be pumped is Pump until the formation fluid appears to obtain the emptied volume of the filtrate of the formation to be pumped; S4. According to the emptied volume of the filtrate of the formation to be pumped, find out the corresponding fluid viscosity from the relationship curve in step S2, and select the corresponding fluid viscosity according to the obtained fluid viscosity. High efficiency pumps pump formation fluids. The formation fluid pumping method of the present invention analyzes the influence of formation fluid viscosity on the pumping process by simulating the formation pumping process, and provides a high-efficiency pumping mode for formation fluid pumping.
Description
technical field [0001] The invention relates to the technical field of well logging operations, in particular to a pumping method for formation fluid. Background technique [0002] With the deepening of exploration, the proportion of pump sampling projects in the logging operations in the eastern South China Sea is increasing. Due to the influence of formation fluid viscosity, the pumping sampling operation is often time-consuming and fails to achieve the purpose of reservoir evaluation, and the eastern part of the South China Sea experiences typhoons every year, resulting in a longer time for the wellbore to be soaked in mud and increasing the difficulty of pumping. Therefore, it is particularly important to improve the overall efficiency of pumping and sampling operations. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a formation fluid pumping method that improves pumping efficiency. [0004] The technical ...
Claims
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IPC IPC(8): E21B49/08
CPCE21B49/088
Inventor 王显南刘超冯进肖东关利军王勇
Owner SHENZHEN BRANCH CHINA NAT OFFSHORE OIL CORP