CN102606096A - A method of cleaning the mud skin on the inner wall of a drill pipe and the cleaning device used - Google Patents

Abstract

The invention discloses a method for cleaning mud skin on the inner wall of a drill rod and a used cleaning device, wherein the cleaning device consists of a reciprocating pump, a high-pressure hose, a water joint, a winch, a fixed pulley and a high-pressure jet cleaning tool; the method can effectively solve the problem that the fisher and the inner pipe assembly cannot be put into a drill hole due to scaling on the inner wall of the drill rod in the wire line core drilling, and has high cleaning efficiency and high cleaning degree.

Description

A method of cleaning the mud skin on the inner wall of a drill pipe and the cleaning device used

technical field

The invention relates to a method for cleaning the mud skin on the inner wall of a drill pipe and a used cleaning device. The method and the device are used for cleaning the mud skin on the inner wall of a wireline core drill pipe.

Background technique

As we all know, core drilling generally adopts diamond rope core drilling, the core tube can be freely put into the bottom of the hole from the drill pipe, and the drill pipe is not raised when taking the coring, and the inner pipe assembly is salvaged with a special overshot to complete the coring . This drilling method greatly improves the coring efficiency and reduces the labor intensity of workers. However, the rotational speed of the drill pipe for diamond wireline core drilling is high, usually 800-1100r/min, and the solid phase particles in the mud will adhere to the inner wall of the drill pipe due to the large centrifugal force to form mud skin. This phenomenon is called the inner wall of the drill pipe. scaling effect. Analysis of the cause of scaling on the inner wall of the wireline coring drill pipe is the solid phase substances in the mud, including clay particles, rock powder, incompletely dissolved chemical treatment agents or flocs, and other solid particles deposited on the inner wall of the pipe. The solid phase particles in the mud adhere to the pipe wall under the action of centrifugal force, and are continuously deposited and compacted. Coupled with the bonding effect of clay and organic polymers, the sediment will gradually dehydrate and become very dense, and firmly adhere to the pipe wall. on the inner wall of the drill pipe.

After the mud skin is formed on the inner wall of the drill pipe, it will affect the input of the overshot and the lifting of the inner pipe assembly. Often the inner pipe assembly is stuck in the drill pipe during coring; Hole accident. In order to obtain the core, several to dozens of drill pipes often need to be raised on site before the overhauler can be lowered to fish the inner pipe assembly, which increases the auxiliary time and affects the drilling efficiency.

The commonly used treatment method is to control the solid phase content in the mud. In order to reduce the solid content in the mud (generally require sand content <0.2%), diamond wireline core drilling now mostly uses low solid phase mud. Some even use solid-free mud. The construction site also uses vibrating screens, cyclone desanders, etc. to control the solid content in the flushing liquid. However, after encountering a natural slurry formation, mud skins still accumulate on the inner wall of the drill pipe. Because the mechanism of diamond wireline core drilling into broken rock is high-speed grinding broken rock, cuttings will inevitably appear during the drilling process. When encountering such formations, it is necessary to regularly detect the solid phase content in the mud. If it is not found in time, there will still be problems that the overshot cannot be put in and the inner pipe assembly cannot be lifted out of the hole. Although the solid-free drilling fluid plays a certain role in controlling the mud content, the cost of mud raw materials is too high, which has certain limitations. After scaling occurs on the inner wall of the drill pipe at the construction site, several drill pipes are usually lifted out, unscrewed and placed flat on the workbench, and a thick steel wire is used to form knots on the thick steel wire with a woven bag or rag on site. One end of the rod is fed into the inner wall of the drill pipe and pulled out from the other end to clean the mud on the inner wall of the drill pipe.

Contents of the invention

The purpose of the present invention is to solve the problems that the overshot cannot be put in and the inner pipe assembly cannot be lifted out of the hole due to the thick mud skin on the inner wall of the drill pipe during cable coring drilling, and the thick steel wire widely used now is used for fixed drilling. Knotted woven bags or rags are used to clean the mud skin on the inner wall of the drill pipe, and the drilling efficiency is low and the cleaning is not clean, and a method for cleaning the mud skin on the inner wall of the drill pipe with high cleaning efficiency and high cleaning degree is provided.

Another object of the present invention is to provide a cleaning device used in the method of cleaning the mud skin on the inner wall of the drill pipe.

Method of the present invention comprises the following steps:

(1) Connect the cleaning device: The cleaning device is divided into two parts: the ground and the hole. One end of the high-pressure hose is connected to the outlet pipe of the reciprocating pump, the other end is connected to the water joint, and the other end of the water joint is connected to the high-pressure hose. One end is wound on the winch, and connected to the high-pressure jet cleaning tool after passing through the upper fixed pulley, and the high-pressure rubber hose and the lower high-pressure jet cleaning tool are welded together through the different-diameter joint;

(2) Lowering the high-pressure jet cleaning tool: connect the whole system, operate the winch, use the high-pressure jet cleaning tool to lower the high-pressure jet cleaning tool into the inner cavity of the drill pipe by means of the guide head;

(3) Clean the inner wall of the drill pipe: start the reciprocating pump, and the cleaning medium enters the high-pressure jet cleaning tool from the reciprocating pump outlet pipe, high-pressure hose, water joint and high-pressure rubber hose; When entering the injection hole, due to the small section of the injection hole, the circulating medium of the cleaning medium is injected into the inner wall of the drill pipe at a rate of fire of 8-13m/s, destroying the mud skin on the inner wall of the drill pipe, and cleaning the inner wall of the drill pipe; under the action of the high-speed jet, Part of the liquid around the injection hole and the inner wall of the drill pipe is taken away by the jet to form a negative pressure zone. Under the action of the pressure difference, a local reverse circulation is formed around the injection hole and the inner wall of the drill pipe, which is conducive to washing the mud on the inner wall of the drill pipe;

(4) According to the circulating medium returned from the orifice, it is judged whether the cleaning of the inner wall of the drill pipe is completed, the drawworks is manipulated, the drawworks is reversed, the high-pressure hose is wound, the high-pressure jet cleaning tool is lifted, the cleaning device is recovered, and the cleaning is completed; the circulating medium is the drill mud used in the process.

The cleaning device used in the method of the present invention is made up of a reciprocating pump, a high-pressure hose, a water joint, a winch, a fixed pulley, and a high-pressure jet cleaning tool. The upper end of the outer tube is fixedly connected to the different-diameter joint, the lower end of the outer tube is fixed to the guide head, and the side wall of the outer tube is provided with several injection holes. The four are evenly arranged, and the corresponding injection holes between the layers are 45°. One end of the high-pressure hose is connected to the outlet pipe of the reciprocating pump, the other end of the high-pressure hose is connected to the water joint, and the other end of the water joint is connected to the high-pressure rubber hose. , one end of the high-pressure hose is wound on the winch, and the high-pressure hose is connected with the high-pressure jet cleaning tool through the upper fixed pulley. The rise and fall of the high-pressure hose and the high-pressure jet cleaning tool in the drill pipe are realized through the winch. The reducing joint of the tool is connected.

The beneficial effect of the present invention: it can effectively solve the problem that the overshot and the inner pipe assembly cannot be drilled due to scaling on the inner wall of the drill pipe during wireline coring drilling; the process is simple and the construction is convenient; the cleaning effect is tested Good, can be widely used; during the drilling process, the cleaning times of the inner wall of the drill pipe can be determined according to the formation conditions, which can effectively avoid the skinning problem on the inner wall of the drill pipe; the cleaning efficiency is high and the cleaning degree is high.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device of the present invention.

Fig. 2 is a schematic diagram of the structure of a partial injection hole of the high-pressure jet cleaning tool of the present invention.

Fig. 3 is a schematic cross-sectional view of the high-pressure jet cleaning tool of the present invention.

Fig. 4 is a sectional view taken along line A-A in Fig. 2 .

Fig. 5 is a cross-sectional view taken along line B-B in Fig. 2 .

Detailed ways

The method of the present invention comprises the following steps: Please refer to Fig. 1 to Fig. 5:

(1) Connect the cleaning device: the cleaning device is divided into two parts on the ground and in the hole. One end of the high-pressure hose 2 is connected to the outlet pipe of the reciprocating pump 1, the other end is connected to the water joint 3, and the other end of the water joint 3 is connected to the high-pressure rubber hose. 6 is connected, one end of the high-pressure rubber hose 6 is wound on the winch 4, and after passing through the upper fixed pulley 5, it is connected with the high-pressure cleaning tool, and the high-pressure rubber hose 6 and the lower high-pressure jet cleaning tool 11 are welded together through the different-diameter joint 7;

(2), lowering the high-pressure jet cleaning tool: connect the whole system, operate the winch 4, use the high-pressure jet cleaning tool to lower the high-pressure jet cleaning tool into the inner cavity of the drill pipe by means of the guide head 10;

(3), cleaning the inner wall of the drill pipe: start the reciprocating pump 1, and the cleaning medium enters the high-pressure jet cleaning tool 11 from the outlet pipe of the reciprocating pump 1, the high-pressure hose 2, the water joint 3 and the high-pressure rubber hose 6; When the high-pressure circulating medium enters the injection hole 9 along the high-pressure hose 2, due to the small section of the injection hole, the cleaning medium circulating medium shoots into the inner wall of the drill pipe at a rate of 8-13m/s, destroying the mud skin on the inner wall of the drill pipe, and realizing the cleaning of the drill pipe. The inner wall of the rod; under the action of the high-speed jet, part of the liquid around the injection hole 9 and the inner wall of the drill pipe is taken away by the jet to form a negative pressure zone, and under the action of the pressure difference, a local reverse circulation is formed around the injection hole and the inner wall of the drill pipe , which is beneficial to scour the mud skin on the inner wall of the drill pipe;

(4), according to the circulating medium returned on the orifice, judge whether the cleaning of the inner wall of the drill pipe is completed, manipulate the drawworks 4, realize the reversal of the drawworks 4, wind the high-pressure rubber hose 6, lift the high-pressure jet cleaning tool 11, recover the cleaning device, and the cleaning is completed; The circulating medium is the mud used in the drilling process.

Please refer to Fig. 1 to Fig. 5, the used cleaning device of the method of the present invention is made up of reciprocating pump 1, high-pressure hose 2, water joint 3, winch 4, fixed pulley 5, high-pressure jet cleaning tool 11, high-pressure jet cleaning The tool 11 is composed of a different-diameter joint 7, an outer tube 8 and a guide head 10, the upper end of the outer tube 8 is fixedly connected to the different-diameter joint 7, the lower end of the outer tube 8 is fixed with the guide head 10, and the side wall of the outer tube 8 is provided with eight Injection holes 9, the inner low and the outer height of the injection holes 9 are arranged obliquely; the eight injection holes 9 are arranged in two layers, and each layer is arranged four evenly. One end of the pipe 2 is connected to the outlet pipe of the reciprocating pump 1, the other end of the high-pressure hose 2 is connected to the water joint 3, and the other end of the water joint 3 is connected to the high-pressure hose 6, and one end of the high-pressure hose 6 is wound on the winch 4, and the high-pressure hose 6 The upper fixed pulley 5 is connected with the high-pressure jet cleaning tool 11, and the high-pressure rubber hose 6 and the high-pressure jet cleaning tool 11 are raised and lowered in the drill pipe through the winch 4. The high-pressure rubber hose 6 and the lower high-pressure jet cleaning tool 11 pass through different diameters. Connector 7 is connected.

The working process of the cleaning device is:

As shown in Figure 1, the winch 4 is operated to lower the high-pressure jet cleaning tool 11 into the inner cavity of the drill pipe. After the reciprocating pump 1 is started, the cleaning medium is discharged from the reciprocating pump 1, the high-pressure hose 2, the water joint 3, and the high-pressure rubber hose 6 Enter the high-pressure jet cleaning tool 11, and spray out from the spray hole 9 obliquely at a speed of 8-13m/s, and shoot to the inner wall of the drill pipe. The jet direction of the high-pressure medium ejected from the spray hole 9 is obliquely upward, so that the cleaning medium The inner wall of the drill pipe flows upwards to realize that the mud skin on the inner wall of the drill pipe is cleaned and the drill pipe is discharged at the same time. During this process, the reciprocating pump 1 provides the required power for cleaning the mud skin on the inner wall of the drill pipe, and the lower high-pressure jet cleaning tool 11 is lifted and lowered by controlling the winch 4 .

Claims (2)

1. A method of cleaning drill pipe inner wall mud skin, the method may further comprise the steps: (1) Connect the cleaning device: The cleaning device is divided into two parts: the ground and the hole. One end of the high-pressure hose (2) is connected to the outlet pipe of the reciprocating pump (1), and the other end is connected to the water connector (3). The water connector ( The other end of 3) is connected with the high-pressure rubber hose (6). One end of the high-pressure rubber hose (6) is wound on the winch (4), and after passing through the upper fixed pulley (5), it is connected with the high-pressure jet cleaning tool (11). The high-pressure rubber hose (6) It is welded together with the lower high-pressure jet cleaning tool (11) through a different-diameter joint (7); (2), lowering the high-pressure jet cleaning tool: connect the whole system, operate the winch (4), use the high-pressure jet cleaning tool (11) to lower the high-pressure jet cleaning tool (11) into the drill by means of the guide head (10) in the rod lumen; (3) Clean the inner wall of the drill pipe: start the reciprocating pump (1), and the cleaning medium enters the high-pressure jet cleaning tool from the outlet pipe of the reciprocating pump (1), high-pressure hose (2), water joint (3) and high-pressure rubber hose (6) (11); when the high-pressure circulating medium sent by the reciprocating pump (1) enters the spray hole (9) along the high-pressure hose (2), due to the small cross-section of the spray hole, the cleaning medium circulates at a rate of 8 to 13m/s. The rate of fire is injected into the inner wall of the drill pipe, destroying the mud skin on the inner wall of the drill pipe, and realizing the cleaning of the inner wall of the drill pipe; under the action of the high-speed jet, part of the liquid around the injection hole (9) and the inner wall of the drill pipe is taken away by the jet to form a negative pressure zone , under the action of the pressure difference, a local reverse circulation is formed around the injection hole and the inner wall of the drill pipe, which is conducive to washing the mud skin on the inner wall of the drill pipe; (4) According to the circulating medium returned from the orifice, judge whether the inner wall of the drill pipe is cleaned, manipulate the drawworks (4), realize the reversal of the drawworks (4), wind the high-pressure rubber hose (6), and lift the high-pressure jet cleaning tool (11) , recover the cleaning device, and the cleaning is completed; the circulating medium is the mud used in the drilling process. 2. A cleaning device used in the method of claim 1, characterized in that: it is composed of reciprocating pump (1), high-pressure hose (2), water joint (3), winch (4), fixed pulley (5) , high-pressure jet cleaning tool (11), the high-pressure jet cleaning tool (11) is composed of a different-diameter joint (7), an outer tube (8) and a guide head (10), and the upper end of the outer tube (8) is fixedly connected to the different-diameter The joint (7), the lower end of the outer tube (8) fixes the guide head (10), and the side wall of the outer tube (8) is provided with 8 injection holes (9), and the injection holes (9) are arranged obliquely upward ; 8 injection holes (9) are arranged in two layers, four of which are evenly arranged in each layer, and the corresponding injection holes between layers are at 45°; The water pipes are connected, the other end of the high-pressure hose (2) communicates with the water joint (3), the other end of the water joint (3) communicates with the high-pressure hose (6), and one end of the high-pressure hose (6) is wound on the winch (4), The high-pressure rubber hose (6) is communicated with the high-pressure cleaning tool (11) through the upper fixed pulley (5), and the high-pressure rubber hose (6) is communicated with the reducing joint (7) of the high-pressure jet cleaning tool (11) of the bottom.

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