RU2002940C1 - Method for well drilling - Google Patents

Description

matura. The circulating system of the rig is hydraulically connected to the tubing and annulus of the first well. When drilling a second well in the event that the density of the drilling fluid deviates from the permissible value (exceeding the permissible value), the calculated part of the drilling fluid from the outlet of the circulation system is sent to the tubing of the first drilled well, and excess water from it through the annulus through the wellhead to the compass tion system. When drilling the third well, the drilling fluid is pumped into the previous drilled well when the density is exceeded, i.e. into the second well, and excess water from there is sent to the circulation system, etc.

Example. In cluster drilling, the BU-3000 EUK drilling rig is used. The maximum allowable density value is 1.16; the required density value is 1.14 t / m. The number of wells in the cluster 6. The volume of drilling fluid in the circulation estimate is 160 m. The volume of drilling fluid removed from the circulating system

L V VPe V / х 160 20 m3 (for max. 1, 1 о - (, U minimum drilling depth 3000 m) From

the same amount of water is squeezed out of the pipe space that is directed into the circulation system to reduce the density of the drilling fluid.

5 In the case of using a casing string with a diameter of 146 mm, the well volume is V LN2-H 3.14-0.073 3000 50.2 m3. 201 meters of drilling fluid can be pumped into 4 wells, and the same amount will be saved.

10 fresh water and perforation mortar. Thus, the calculated part of the drilling fluid is injected from the circulating system of the drilled well when its density is higher than the permissible

15 values to the previous drilled well and the direction of the fluid displaced from it into the circulation system can increase the efficiency of the drilling process by reducing the cost of

20 maintaining the density of the drilling fluid at a given level.

(56) Sidorov N.A. Drilling and exploitation of oil and gas wells. M .: Nedra, 1982. from 11-15, p. 120-123

25 Advanced control methods

solids content in drilling fluids1 study of dehydration in SPE Drill Tng centrifuges. 1988.3 PZ, pp. 315-324

thirty

Claims (1)

The claims METHOD FOR DRILLING A WELL, including fracture of rocks, removal of sludge from the bottom of the drilling fluid, cleaning of the drilling fluid from the sludge, stabilization of the density of the drilling fluid and removal of the spent drilling fluid into the sludge barn, characterized in that 40, in order to increase the efficiency of the process during cluster drilling by reducing the cost of maintaining the density of the drilling fluid at a given level, stabilization of the drilling fluid 5 is carried out by pumping part of the drilling fluid from the circulating system with a drill wells into the previous drilled well and the direction of the fluid displaced from it into the circulating system of the drilling fluid, while the volume of the control fluid removed from the circulating system of the drilling fluid is determined from the condition AV Rdop-Rtreb.ub M3 pRon- ro where RDOP - the maximum allowable value of the density of the drilling fluid, t / m2; Rtreb - required density value drilling mud, t / m3; Рв - water density, t / m3; Ubr - drilling fluid volume in the circulation system, m3.