Drilling Common Sense

- May 24, 2019-

Drilling type introduction:

Balanced pressure drilling: In the drilling process, always protect the borehole pressure is equal to the formation pressure of a drilling method called balanced pressure drilling.

Injection drilling: Jet drilling is a drilling method that uses drilling fluid to improve the mechanical drilling speed when using the jet drill nozzle to produce the hydraulic action of high-speed jet flow. Solid well: is to the well down into a certain size of casing string, and in the surrounding injection of cement mud, the casing fixed on the wall, to avoid the collapse of the well wall.


Its purpose is: sealing loose, easy to collapse, easy to leak and other complex formations, sealing oil, gas, water layer, to prevent leakage of each other, installation of wellheads, control oil and gas flow, in order to benefit drilling or production of oil and gas.

Drill pipe formation test data introduction: Drill pipe formation test: is an advanced technology that uses drill pipe or oil pipe to lower the formation tester with sealer into the well for oil testing.

It can be tested either in a well that has been drilled into the casing, or in a bare hole that is not drilled into the casing, and can be tested after the drilling is completed or in the middle of the drilling. Cable formation test: After the oil and gas display is found in the drilling process, the sample of fluid in the formation can be obtained and the formation pressure measured by the cable down into the formation tester.

This test method is relatively simple and can be performed many times and repeatedly.

Oil pipe transmission shot hole: the oil pipe transmission shot hole is by the oil pipe to bring the perforator into the well, after the hole can directly make the formation of fluid through the oil pipe lead to the ground, do not need to fill the well in the hole, to avoid the bottom of the well pollution of an advanced technology. Rock porosity: The porosity of a rock is the ratio of the spatial volume Vp in the rock that is not filled with solid material and the total volume of the rock Vb.

Expressed in the Greek letter, the expression is: s.V. pores/V rocks x 100% s Vp/Vb x 100% The volume coefficient of stratigraphic crude oil: the formation crude oil volume coefficient betao, also known as the underground volume coefficient of crude oil, or crude oil volume coefficient for short. It is the ratio of the volume of crude oil underground (i.e., the volume of stratigraphic oil) to the volume of the oil after it degassed on the ground. The underground volume coefficient of crude oil is always greater than 1.

: Fluid saturation: The saturation of a fluid is the percentage of volume that a fluid occupies in a reservoir's rock pores. It indicates the extent to which the pore space is occupied by a certain fluid.

When a rock is filled with several phase fluids, the sum of these phase fluid saturations is 1 (100%).

Note Cement construction process: the next casing to the predetermined depth of cement loading head, circulating mud, ground-to-ground pipeline , injection isolation liquid , cement injection , top glue plug , mud , touch pressure , cement end, waiting for coagulation.


Completion of the wellhead installation:


(1) casing head - seal two layers of casing ring air, hanging the second part of the casing column and bear a part of the weight;


(2) oil pipe head - seat cone tube hanging, connecting the oil layer casing and oil collection tree, ventgate, pipeline;


(3) Oil-producing trees - control the flow of oil and gas, safe and planned production, complete dwelling testing, injection, pressure wells, well waxing and other operations. Tailpipe cementing method: tailpipe cementing well is in the upper well has a casing, only the lower newly drilled naked eye well section under the casing cement to seal the cement method. There are three fixed methods of tailpipe: tailpipe situ at the bottom of the well, drilling cement ring suspension method, tailpipe suspension method