A Calculation Method of Throwing and Throwing Pressure Used in Layered Oil Production
A calculation method and layered oil recovery technology, applied in calculation, computer-aided design, earthwork drilling, etc., can solve the problem of low success rate of throwing ball drop pressure, etc., and achieve the effect of preventing pipe string creep.
Active Publication Date: 2021-11-30
PETROCHINA CO LTD
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[0004] An embodiment of the present invention provides a method for calculating the drop-off pressure for stratified oil production, so as to solve the above-mentioned problem that the success rate of drop-off pressure determined by experience is relatively low
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[0035] In order to make the technical solutions and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.
[0036] An embodiment of the present invention provides a method for calculating the drop-off pressure for layered oil production, the calculation method comprising the following steps:
[0037] Step a. Calculate the pressure of the water column above the throw according to the formula (1):
[0038] P H =kH······(1);
[0039] Among them, P H Represents the pressure of the water column above the throw, MPa;
[0040] H represents the length of the oil pipe above the hand, m;
[0041] k represents the conversion factor of water column pressure per meter, MPa / m;
[0042] Step b. Calculate the outlet pressure of the sur...
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The invention discloses a calculation method of throwing ball pressure for stratified oil recovery, which belongs to the technical field of oil field recovery. The calculation method includes: calculating the water column pressure above the hand, calculating the relationship between the normal force on the steel ball and the outlet pressure of the ground pump truck, and calculating the relationship between the contact length between the steel ball and the ball seat and the outlet pressure of the ground pump truck Calculate the relationship between the maximum contact pressure between the steel ball and the ball seat and the outlet pressure of the surface pump truck, so as to calculate the outlet pressure of the surface pump truck. The outlet pressure of the surface pump truck is the throwing pressure. Using the calculated drop-off pressure to carry out the drop-off construction of the pipe string can not only ensure the smooth progress of the drop-off construction, but also prevent the peristalsis of the pipe string, and provide a theoretical basis for reasonably determining the drop-off pressure. It is applied to more than 50 oil wells on site and constructed once 100% success rate.
Description
technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a method for calculating throwing pressure for stratified oil recovery. Background technique [0002] Layered oil recovery is one of the basic means to rationally develop oil fields, increase oil recovery speed, and ensure oil fields have a high ultimate recovery rate. Throwing and throwing is a necessary technical means and construction steps in the layered oil recovery process. Specifically, the lower end of the hand is usually connected to the packer of the layered oil production string, and the upper end of the hand is connected to the construction string, and the hand is divided into two parts under a certain pressure. A ball seat is usually attached to the lower end of the column. When performing layered oil production, first use the construction string to drive the layered oil production string into the well, then pressurize to set the packer, then put...
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IPC IPC(8): G06F30/28E21B23/00G06F119/14
CPCE21B23/00G06F30/17G06F2119/06
Inventor 付亚荣吴勇李仰民程尧马永忠和改英杨中峰王达李琳王旭东付丽霞李云姜一超姚庆童李小永张云钊张睿荫付茜
Owner PETROCHINA CO LTD