RU2569653C1 - Method for conductor drilling of well disastrous lost circulation and device for its implementation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method includes cyclic process of conductor drilling of a well by drilling tool with water flush without circulation, with stops for water taking to suction pits. During cycle stops for water taking the drilling tool is removed with drilling bit from the well is removed and a pump at the drill string is run in and set at the level per 10-20 m lower than formation water standing level in the well, at the wellhead top end of the process string is bound to suction pits. The pump is started and formation water is taken to suction pits from the well, upon their filling the pump is switched off, the drill string with pump is run out from the well, the drilling tool with drilling bit is run in and top end of the drilling tool is bound to suction pits; drilling is continued in the interval of disastrous lost circulation zone with flushing by formation water until water from suction pits is consumed. Then the above cycle of making stop for formation water intake to suction pits and drilling is repeated.

EFFECT: reduced duration of the process without loss in efficiency; no auxiliary equipment is required.

2 cl, 2 dwg

Description

The invention relates to the field of oil and gas industry, in particular to the field of drilling oil and gas wells, in particular to the elimination of complications.

There is a method of drilling a well under a conductor during catastrophic absorption (Andronov SN, Kurochkin BM and others. "Liquidation of catastrophic absorption during drilling under a conductor." Construction of oil and gas wells on land and at sea. - 2009 - No. 4), including drilling a borehole under the conductor to the design depth using a drilling tool with BHA, lowering the conductor during catastrophic absorption of the drilling fluid with isolation of the interval of absorption of the well.

The disadvantage of this method is the lengthy and expensive process of implementing the method associated with the conduct of insulation work with the injection of a large number of grouting materials during numerous tripping operations.

As well as a device for drilling a well under a conductor during catastrophic absorption (Andronov SN, Kurochkin BM and others. “Elimination of catastrophic absorption during drilling under a conductor.” Construction of oil and gas wells on land and at sea. - 2009 . - No. 4) containing a boring tool with a chisel.

The disadvantage of this device is the inability to pump formation water from the interval of the zone of catastrophic absorption of the well into the receiving barns during the opening of this interval of the well under the conductor.

Also known is a method of drilling a catastrophically absorbing formation (patent RU No. 2259460, IPC E21B 21/00, published on 08/27/2005 in bull. No. 21), including the determination of the absorption interval, as well as such characteristics as the intensity of absorption, the presence in these intervals of drilling tool failures, changes in the mechanical drilling speed from drilling materials and geophysical studies in neighboring drilled wells, determining the reservoir pressure of the absorbing formation and opening it with drilling using a mud, given by the filler, and the opening of the absorption interval with partial absorption is started using a clay solution with a viscosity of 35-40 s and with a density that provides an excess of the pressure of the column of drilling mud from the reservoir by 0.3 ÷ 0.4 MPa, with a content of fibrous fillers of 8-10% from the volume of the drilling fluid, with the layout of the bottom of the drill string, weighted by the drill pipe, length 75 ÷ 100 m, diameter 165 ÷ 178 mm and with a bit without a nozzle, flushing the bottom of the well with the specified drilling fluid is carried out with a productivity of not more e 14-15 l / s, with a loss of circulation of the drilling fluid, the content of fibrous filler in it is increased to 25 ÷ 35%, and washing the face with further deepening is carried out with a pump capacity of 3-4 l / s until the circulation is restored, and after complete penetration the absorption interval, the absorption zone is fixed by injection of cement mortar. The disadvantages of this method are:

- firstly, a difficult process to implement, requiring strict adherence to the sequence of technological operations;

- secondly, an expensive process associated with high costs for insulating materials: fibrous fillers, cement mortar and delivery;

- thirdly, the lengthy process of implementing the method associated with the conduct of insulation work with the injection of a large amount of cement mortar and filler, as well as the delivery of water to receiving barns.

As well as a device for drilling a catastrophically absorbing formation (patent RU No. 2259460, IPC E21B 21/00, published on 08/27/2005 in bull. No. 21), containing a drilling tool with a chisel.

The disadvantage of this device is the inability to pump formation water from the interval of the zone of catastrophic absorption of the well into the receiving barns during the opening of this interval.

The closest in technical essence and the achieved result is a method of drilling a well under a conductor during catastrophic absorption (Krylov VI "Complications when drilling wells. - M .: Nedra, 1965), including a cyclic process of drilling a well with a drill bit with a conductor bit with flushing with water, without circulation, with stops for water intake, the process according to the scheme is as follows: stopping for water intake in receiving barns - drilling - stopping for water intake in receiving barns, while delivering water to tankers mi of nearest pond water and produce a set of pits in the receiving tank trucks.

The disadvantages of the method are:

- firstly, the lengthy process of implementing the method associated with large downtimes in the stopping cycle in anticipation of the delivery of water by vehicles and the frequency of movement of vehicles to the nearest reservoir;

- secondly, the high cost of implementing the method, associated with high costs for vehicles for the periodic delivery of water to receiving barns during cyclic drilling, especially when the pond is far from the well being drilled, and in the absence of a pond, it is necessary to lay a conduit, which is fraught with even higher material and financial costs.

And also a device for drilling a well under a conductor during catastrophic absorption (VI Krylov "Complications during well drilling." - M .: Nedra, 1965), containing a drilling tool with a chisel.

The disadvantage of this device is the inability to pump formation water from the interval of the zone of catastrophic absorption of the well into the receiving barns during the opening of this interval of the well under the conductor.

The technical task of the proposal is to reduce the duration and cost of implementing the method without losing the effectiveness of its implementation with the possibility of pumping produced water from the interval of catastrophic absorption of the well into the circulation system during the opening of this interval of the well under the conductor.

The problem is solved by a method of drilling a well under a conductor during catastrophic absorption, including a cyclic process of drilling a well with a drilling tool with a chisel for a conductor with water flushing without circulation with stops for water intake into receiving barns.

What is new is that in stopping cycles, a drilling tool with a chisel is removed from the well, the pump is lowered into the well in the interval of the catastrophic absorption zone on the column of process pipes and it is set 10-20 m below the established level in the well, at the wellhead the upper end of the column of process pipes with receiving barns, start the pump and produce reservoir water into the receiving barns from the well, after filling the receiving barns with reservoir water, turn off the pump and remove the columns near technological pipes with a pump from the well, lower the boring tool with a chisel and tie the upper end of the boring tool with receiving barns, continue drilling in the interval of the catastrophic absorption zone with flushing with produced water until the water in the receiving barrels is used up, after which the above-described stopping cycle for producing produced water in receiving barns and drilling repeat, starting with the extraction from the well of a drilling tool with a chisel.

Also, the problem is solved by a device for drilling a well under a conductor during catastrophic absorption, containing a boring tool with a bit for cyclic drilling with stops at a set of water in receiving barns.

New is that the device in the interval of the catastrophic absorption zone in stopping cycles for water intake is equipped with a column of process pipes with a pump for pumping produced water from the well into receiving barns.

Figure 1 schematically depicts the proposed method of drilling a well under a conductor during catastrophic absorption and a device for its implementation in a drilling cycle.

Figure 2 schematically depicts the proposed method of drilling a well under a conductor during catastrophic absorption and a device for its implementation in a cycle of stopping the set of water in the receiving barns.

The method of drilling a well under a conductor during catastrophic absorption is implemented if there is the possibility of pumping produced water from the well being drilled, it includes a cyclic drilling process with stops for water intake in receiving barns and is implemented as follows.

Drill a well 1 (see Fig. 1) under a conductor (not shown in Figs. 1 and 2) using a drilling tool 2 (see Fig. 1) with a chisel 3 with water rinsing, which is fed from receiving barns 4 in the interval drilling through a drilling tool 2 and a chisel 3.

Drilling a well 1 under a conductor is carried out before opening the interval of the catastrophic absorption zone 5 and using up water in the receiving barns 4, as a result of which a stopping cycle is reached for water to enter the receiving barns 4.

In the stopping cycle, a water tool 2 with a chisel 3 is removed from the well 1 from the well 1. The pump 7 is lowered into the well 1 (see Fig. 2) in the interval of the catastrophic absorption zone 5 on the column of process pipes 6 and set it 10-20 m lower steady level 8 formation water in well 1.

As a column of process pipes 6, for example, a drill pipe string used as part of a drilling tool 2 when drilling a well 1 is used to prevent the import of pipes of a different size.

As the pump 7 use any known pump, for example an electric centrifugal pump. The placement of the pump 7 in the column of process pipes 6 to 10-20 m below the steady-state level 8 of formation water in the well allows for the complete filling of the receiving barns 4 with formation water during operation of the pump 7.

At the wellhead 1, the upper end of the column of process pipes 6 is tied with receiving barns 4, for example, through manifold 9. Start pump 7 and produce reservoir water from well 1 into receiving barns 4. After filling the receiving barns 4 with formation water, turn off pump 7 and remove a string of production pipes 6 with a pump 7 from the well 1. The drilling tool 2 is lowered with a chisel 3 (see Fig. 1) and the upper end of the drilling tool 2 is hydraulically tied with receiving barns 4.

Drilling is continued in the interval of catastrophic absorption zone 5 with washing with produced water from receiving barns 4 until reservoir water is used up in receiving barns 4, for example, when drilling the interval of catastrophic absorption zone 5, the well is deepened under the conductor by 12 m.

After that, the above-described stopping cycle for the formation water set into the receiving barns 4 and drilling is repeated, starting from the cure of the drilling tool 2 from the well 1 with a bit 3.

The delivery of water by vehicles from the nearest body of water is excluded, while due to the use of produced water produced from the borehole 1 using pump 7, the time required to fill the receiving barn 4 with water is reduced, and the cost of implementing the method is also reduced, since the cost of transport for periodic delivery of water from the reservoir to the receiving barns 4.

A device for drilling a well 1 under a conductor during catastrophic absorption contains a drilling tool 2 with a bit 3 (see Fig. 1) for cyclic drilling with a stop at a set of water in the receiving barns 4.

The device in the interval of the catastrophic absorption zone 5 in stopping cycles for water intake is equipped with a column of process pipes 6 (see Fig. 2) with a pump 7 for pumping produced water from the well into receiving barns 4.

The device allows to pump out produced water from the interval of the catastrophic absorption zone 5 into receiving barns 4 in the process of opening this interval of the well under the conductor, which reduces financial and material costs.

The proposed method of drilling a well under a conductor during catastrophic absorption and a device for its implementation allow:

- firstly, to reduce the duration and reduce the cost of implementing the method without losing the effectiveness of its implementation;

- secondly, to pump out formation water from the interval of catastrophic absorption of the drilling fluid into the circulation system during the opening of this interval of the well under the conductor;

- thirdly, it does not require additional equipment, except for a pump with a cable, because drill pipes, square or VSP and monifold are used.

Claims (2)

1. A method of drilling a well under a conductor during catastrophic absorption, including a cyclic process of drilling a well with a drill tool with a chisel for a conductor with water flushing without circulation, with stops for water supply to the receiving barns, characterized in that the drill is removed from the well in stop cycles for water intake a tool with a chisel, a pump is lowered into the well in the interval of the catastrophic absorption zone on the column of process pipes and set it 10-20 m below the steady-state level of formation fluid in importantly, at the wellhead, the upper end of the process pipe string is tied with receiving barns, the pump is started and produced water is collected into the receiving barns from the well, after filling the receiving barns with reservoir water, the pump is turned off and the technological pipe string with the pump is removed from the well, the drilling tool is lowered with with a chisel and tie the upper end of the drilling tool with receiving barns, continue drilling in the interval of the catastrophic absorption zone with washing with produced water until it is used up ode in reception barns, whereupon the above cycle stop on a set of formation water into the receiving barns and drilling is repeated, starting with the retrieval of the wellbore a drilling tool with a chisel. 2. A device for drilling a well under a conductor during catastrophic absorption, comprising a drilling tool with a bit for cyclic drilling with stops to draw water into the receiving barns, characterized in that the device in the interval of the catastrophic absorption zone in stopping cycles for water supply is equipped with a column of process pipes with a pump for pumping produced water from the well into receiving barns.

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