CN114763732A - Pressure control casing drilling method for underground injection pressure containing stratum - Google Patents

Abstract

A method of drilling a well with a controlled pressure casing for use downhole with injection pressure of a subterranean formation. The method mainly solves the problems that the yield is influenced when the existing three-mining casing damage well is drilled and shut down to renew the well, the three-mining development effect is influenced, and the drilling safety is influenced when the well is not drilled and shut down. The method is characterized in that: firstly, drilling a well, secondly, cementing the well, installing pressure control drilling equipment and testing the pressure; secondly, drilling a well in a non-oil layer section, testing by using a hydraulic pressurization anti-inclination tool, and recording the pressure of a neutral pipe and the displacement of a pump in the process; drilling a well in a second casing drilling section, and cementing a well; and (6) logging. By adopting the pressure-controlled casing drilling method for underground injection pressure containing stratum, a well can be drilled and updated under the condition of not stopping the well, the injection-production relation of a casing damage well group can be completed in time, the injection of a drilling area is not influenced, and the normal block development effect is ensured.

Description

Controlled pressure casing drilling method for downhole containing formation injection pressure

technical field

The invention relates to the field of oil fields, in particular to a pressure-controlled casing drilling method used for downhole containing formation injection pressure.

Background technique

After years of oilfield development, the number of wells with casing damage problems in the third production block is increasing. According to the production capacity construction needs of the third mining block, more and more wells need to be drilled and updated. However, conventional drilling of newer wells has the following problems:

(1) Drilling passes have a great impact on production: due to the scattered distribution of update wells, pressure reduction is required during conventional drilling (the so-called "drilling pass"). On average, there are 40 water (inlet) wells in the scope, and the impact time is about 35 days. Conventional drilling of one renewal well affects the oil volume and causes large pressure changes in the local well area, which is not conducive to casing protection.

(2) The drilling level of the updated well affects the development effect of tertiary oil recovery: According to the requirements of the oil displacement plan, in order to ensure the development effect of the tertiary production positive polymer injection block, continuous injection is required during the injection period, which makes casing damaged wells in the tertiary oil recovery block. It cannot be updated in time, and the injection and production of the local well pattern is not perfect; if the updated well is a three-production well pattern well, and it is updated after waiting for one cycle, the reserves in the updated well area have not been effectively produced during the tertiary oil recovery process and cannot be carried out three times. Oil production; if the pressure reduction at the drilling pass is adopted, the plug of the accumulation section will be loosened, which will affect the development effect and benefit of the third production.

(3) Not drilling shutoffs will have a great impact on drilling safety and cementing quality under conventional drilling conditions: it may be difficult to determine local ultra-high pressure of formation static pressure, and there may be superimposed risks such as shallow gas in some blocks.

At present, in view of the above geological conditions, in order to ensure drilling safety and cementing quality, conventional drilling of replacement wells is completed under the conditions of drilling, shutting down and shutting down wells.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the existing tertiary production casing damaged wells that affect production and the tertiary production development effect when drilling and shutting down the well, and that the drilling safety is affected by not drilling shut-ins, the present invention provides a pressure-controlled casing drilling for downhole containing formation injection pressure Method, by adopting the pressure-controlled casing drilling method for the injection pressure of underground formations, new wells can be drilled under the condition of non-stop well, which can not only improve the injection-production relationship of casing-damaged well groups in time, but also does not affect the injection in the drilling area. Guarantee the normal block development effect.

The technical scheme of the present invention is: a control pressure casing drilling method for downhole containing formation injection pressure, comprising the following steps: first drilling, opening cementing, installing managed pressure drilling equipment and testing pressure; second opening non-oil layers Section drilling, hydraulic pressurization anti-deviation tool test, and record riser pressure and pump displacement during the process; second casing drilling section drilling, second opening cementing; logging.

Further, after the cementing is started, the roller cone bit drills the plug, continues to drill for 5-10m, and then installs the managed pressure drilling equipment.

Further, when drilling in the second open casing drilling section, first put the pipe string to the bottom of the well, rotate the drilling, recirculate, connect to the column for managed pressure drilling. connect the removed casing;

Further, before the second-opening cementing, adjust the length of the casing short section to ensure that the coupling is just exposed to the casing head after the sufficient pocket; connect the top joint, and the make-up torque is the lowest make-up torque; connect the drilling pump and circulate; Formation leakage test.

Further, during the second opening cementing, connect the rotary cementing cement head, apply spacer fluid, inject cement, press the rubber plug, replace it, and test the casing pressure; after cementing, close the well sealing device, and add back pressure in the annulus to wait for solidification.

Further, after the second-opening cementing, remove the header joint and install the ring iron.

The invention has the following beneficial effects: the control pressure casing drilling method for pressure drilling uses a special casing for drilling, the control pressure equipment and method are used to precisely control the annular pressure in the wellbore, and the well is directly cemented after drilling, It has the advantages of shortening the drilling cycle, simplifying the drilling process, and reducing the drilling accidents of blowout and leakage. Using the feature of casing drilling that "drilling is the process of running casing, and cementing can be done after drilling", it reduces the accident of loss of bottom hole pressure during the process of "electrical measurement and casing running after drilling" in conventional drilling. occur.

Detailed ways

The present invention is further described below:

A control pressure casing drilling method for downhole containing formation injection pressure, comprising the following steps:

(1) Once drilling, once cementing, after the first cementing, drill the plug with the roller cone bit and continue to drill for a certain footage, such as 5-10m, then install the managed pressure drilling equipment and debug the managed pressure drilling equipment , pressure test, joint debugging, and the construction can be started after the test run is normal.

(2) For drilling in the non-oil zone of the second opening, select the hydraulic pressurized anti-slope tool, open and close the hydraulic pressurized anti-slope tool through the top drive, test and record the riser pressure and pump displacement during the process, so as to judge Whether the tool is normal, determine whether the tool is unobstructed, and whether the pressure of the fluid passing through the tool is normal.

(3) Drilling in the second casing drilling section and cementing in the second opening:

a. Connect two casings into a column, connect the drive rod protection joint at the upper end of each column, and put a male protection wire on the lower end of the column, which is placed on the drill floor;

b. Lower the pipe string to the bottom of the well, rotate the drilling, recirculate, connect the vertical string to the casing for managed pressure drilling, remove part of the casing after drilling, ream the hole and pass the well, and then connect the removed pipes casing;

c. Connect the cementing string, adjust the length of the casing short section, and ensure that the coupling is just exposed to the casing head after the pocket is left; when connecting the top section, the make-up torque is the minimum make-up torque, which not only ensures the connection and sealing, but also It is convenient to shackle after cementing; connect drilling pump, circulation, and formation leakage test;

d. Connect the rotary cementing cement head, apply isolation fluid, and inject cement (the cementing string can be lifted and lowered, or the cementing string can be rotated). If the cement slurry does not flow through the drill bit and the screw drill due to the high pressure of the circulating pump If the tool is installed, then throw the ball and hold the pressure to open the bypass valve; press the rubber plug to replace (the cementing string can be lifted up and down, or the cementing string can be rotated, but not at the same time), the rubber plug touches the pressure; casing pressure test, test After the pressure is finished, open the well pressure and wait for solidification. If the well can not be opened, shut in the well and wait for solidification. The shut-in pressure is 1-2MPa higher than the equilibrium pressure of the annulus. After cementing, close the well sealing device, and add back pressure in the annulus to wait for the solidification. If the check valve fails, calculate the pressure difference between the inside and outside of the pipe, and hold the pressure for condensation.

e. Remove the top section and install the ring iron;

f. Well logging: to measure geological parameters and engineering parameters.

Aiming at the problem that the drilling level of the scattered update wells affects the production, this drilling method adopts the method of applying back pressure in the wellhead annulus, and proposes a drilling and completion plan for the control pressure casing of the scattered update wells, so as to achieve the purpose of improving the well pattern and reduce the impact on production. influences. During drilling, circulation, and single connection, back pressure is applied to the wellhead by adjusting the automatic choke manifold; one drilling and completion, direct cementing, realizes the whole process control pressure, reduces the control of the tripping and casing running process At the same time, considering the clear geological conditions of the surrounding wells, logging after casing is adopted; cementing replacement and Hou Ning apply annulus back pressure to the wellhead by adjusting the automatic choke manifold. Aiming at the problem that the formation fracture pressure of some layers in a wellbore is higher than the formation pore pressure, in order to reduce the occurrence of drilling fluid leakage and formation, reduce the drilling fluid density, and use pressure control equipment and methods to accurately control the annular pressure in the wellbore. Make sure that there is no collapse or leakage and safe drilling. The use of hydraulic pressurized anti-deflection tools can ensure that the casing is not bent due to axial compression without the use of drill collars, prevent the well deviation, flexibly apply WOB to the drill bit, and at the same time isolate the rock breaking effect of the drill bit. Vibration damage from casing.

Claims (6)

1. A method of drilling a well with a controlled pressure casing downhole containing formation injection pressure, comprising the steps of: firstly, drilling a well, secondly, cementing the well, installing pressure control drilling equipment and testing the pressure; drilling a well in a non-oil layer section, testing a hydraulic pressurization anti-deviation tool, and recording the pressure of a neutral pipe and the pump displacement in the process; drilling a well in a second casing drilling section, and cementing a well; and (6) logging.

2. The method of claim 1 for drilling a controlled pressure casing downhole containing formation injection pressure, wherein: after the well is first opened, the roller bit drills the plug, the drill continues to drill for 5-10 m, and then pressure control drilling equipment is installed.

3. The method of claim 2 for drilling a controlled pressure casing downhole containing formation injection pressure, wherein: when drilling in the two-casing drilling section, the pipe column is firstly put to the bottom of the well, rotary drilling is carried out, recirculation and connection of the stand column are carried out to control pressure drilling, partial casings are removed after drilling, and the removed casings are connected after reaming and drifting.

4. The method of claim 3 for drilling a controlled pressure casing downhole containing formation injection pressure, wherein: before second-opening well cementation, the length of a short section of the casing pipe is adjusted to ensure that the casing head just exposes out of the coupling after a sufficient pocket is reserved; connecting the top connection section, wherein the upper buckling torque is the lowest upper buckling torque; connecting a drilling pump and circulating; and (4) performing a formation leakage test.

5. The method of claim 4 for drilling a controlled pressure casing downhole containing formation injection pressure, wherein: when the well is opened, connecting a rotary well cementing head, injecting isolation liquid, injecting cement, pressing a rubber plug, replacing, and testing the pressure of the casing; and (5) closing the well sealer after well cementation, and adding back pressure to the annulus for waiting for setting.

6. The method of claim 5 for drilling a controlled pressure casing downhole containing formation injection pressure, wherein: and after second-opening well cementation, detaching the connecting top joint and installing ring iron.