CN101545358B - Erosion reducing system for gas drilling - Google Patents

Erosion reducing system for gas drilling Download PDF

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Publication number
CN101545358B
CN101545358B CN200910059174A CN200910059174A CN101545358B CN 101545358 B CN101545358 B CN 101545358B CN 200910059174 A CN200910059174 A CN 200910059174A CN 200910059174 A CN200910059174 A CN 200910059174A CN 101545358 B CN101545358 B CN 101545358B
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China
Prior art keywords
erosion
back pressure
gas
gas drilling
nozzle
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Expired - Fee Related
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CN200910059174A
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Chinese (zh)
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CN101545358A (en
Inventor
李黔
江川
梁海波
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Southwest Petroleum University
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Southwest Petroleum University
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Abstract

The invention relates to an erosion reducing system for gas drilling, which belongs to the technical field of the gas drilling of oil and natural gas. The erosion reducing system applies a gas drilling erosion mechanism and a back pressure control technique; on the basis of a well control device of the conventional gas drilling, an improved sand draining pipeline, a depressurization nozzle and gas drilling erosion-reducing back-pressure control analysis software are added to the system; and the software is used for calculating the back pressure value required by the erosion reduction under the given injection pressure and delivery capacity and recommending a reasonable depressurization nozzle combination for generating the back pressure value, and the nozzle combination recommended by the software is mounted at the inlet end of the sand draining pipeline to control the back pressure at the mouth of a well, wherein the back pressure value can reduce the erosion effect of high-speed gas-solid two-phase flow to an underground drilling tool and a device at the mouth of the well while the rock-carrying capacity of annulus gas is ensured.

Description

Erosion reducing system for gas drilling
Technical field
The present invention relates to a kind of erosion reducing system for gas drilling,, reduce the erosion of gas, belong to oil and natural gas gas drilling technical field down-hole equipment and wellhead blowout preventor combination through the control wellhead back pressure.
Background technology
Gas drilling is to utilize gas to replace drilling fluid as circulating the drillng operation that medium carries out, and gas has that density is low, viscosity is low, to the pit shaft low characteristics of exerting pressure.The advantage of gas drilling has: drilling efficiency is high, effectively protect oil-gas Layer, prevent leakage and stick bit freezing.Can also effectively overcome gas drilling leakage, shale down hole problem such as collapse.But also there are a series of problems in gas drilling in application process: 1, because gas drilling lacks the lubrication of drilling fluid, the high speed landwaste is serious to the pit shaft (drilling rod, drill collar, bore hole and sleeve pipe etc.) and the erosion of sediment outflow pipeline; 2, it is serious etc. to contain at a high speed the sour corrosion of landwaste gas medium.Can produce surface blemishes because of erosion and wearing and tearing if handle the problems referred to above down-hole equipment and ground installation untimelyly, under the effect of alternating stresses, be easy to form crackle simultaneously, finally cause the damage of down-hole equipment and ground installation.
But the conventional gas drilling well is for guaranteeing the large rock-carrying ability of annular space gas, and well head does not generally apply back pressure.This just causes the conventional gas drilling well to lack rational and effective back pressure control technology and equipment, makes down-hole equipment and wellhead blowout preventor combination erosion seriously can not get effective solution.Therefore, through learning gas drilling well erosion mechanism and back pressure control technology, an integrated cover erosion reducing system for gas drilling is to solve the conventional gas drilling well at the effective ways that guarantee to reduce on the annular space gas large rock-carrying ability basis erosion problem.
Summary of the invention
In order to control the erosion problem of gas drilling process high speed gas-solid phase to down-hole equipment 6 and wellhead blowout preventor combination 5, the present invention provides a kind of erosion reducing system for gas drilling.This system not only can be through the preferred step-down nozzle 1 of back pressure and the installation site of this nozzle under designated gas injection pressure and discharge capacity, controlled; Reduce of the erosion of high speed gas-solid phase, and can guarantee the large rock-carrying ability of annular space gas down-hole equipment and wellhead blowout preventor combination 5.
The technical solution adopted for the present invention to solve the technical problems is: on conventional gas drilling well control Equipment Foundations; Through increasing improved sediment outflow pipeline 2, step-down nozzle 1 and gas drilling erosion back pressure control analysis software falls, an integrated cover erosion reducing system for gas drilling; The utilization numerical Analysis is under designated gas injection pressure and discharge capacity; After annular space well head 7 adds back pressure; The high speed gas-solid phase is to the erosion effect of down-hole equipment 6 and wellhead blowout preventor combination 5; It is the erosion critical speed whether mineshaft annulus 8 and the gas-solid phase speed in the wellhead blowout preventor combination 5 reach down-hole equipment 6 and wellhead blowout preventor combination 5; If surpass the erosion critical speed, then readjust the back pressure of annular space well head 7 and analyze again, take between rock speed and the erosion critical speed between minimum up to gas-solid phase speed; According to the numerical analysis result step-down nozzle combination of erosion back pressure control and the installation site of recommending the step-down nozzle can fall under this injection pressure and discharge capacity preferably through falling erosion back pressure control analysis software; Thereby accurately control wellhead back pressure, when guaranteeing annular space gas large rock-carrying ability, reduce of the erosion effect of high speed gas-solid phase down-hole equipment 6 and wellhead blowout preventor combination 5; The multistage hypotensive effect of step-down nozzle 1 can reduce the erosion critical speed of gas-solid phase in the sediment outflow pipeline, thereby reduces the erosion of gas-solid phase to sediment outflow pipeline bent sub 9.
The invention has the beneficial effects as follows: through learning gas drilling well erosion mechanism and back pressure control technology; Set up a cover erosion reducing system for gas drilling, on the basis that guarantees the gas large rock-carrying ability, control the erosion problem of gas drilling down-hole equipment 6 and wellhead blowout preventor combination 5 rationally and effectively.Can reduce construction cost, guarantee construction safety.
Description of drawings
Fig. 1 is an erosion reducing system for gas drilling structural representation of the present invention.Among the figure: 1. step-down nozzle, 2. sediment outflow pipeline, 3. sediment outflow pipeline arrival end, the 4. sediment outflow pipeline port of export, 5. wellhead blowout preventor combination, 6. down-hole equipment, 7. annular space well head, 8. mineshaft annulus, 9. sediment outflow pipeline bent sub.
Fig. 2 is that erosion reducing system for gas drilling of the present invention is that 1.0MPa and discharge capacity are 27m in injection pressure 3The graph of a relation of annular velocity the under/min and erosion critical speed.
Fig. 3 is that erosion reducing system for gas drilling of the present invention is that 1.0MPa and discharge capacity are 27m in injection pressure 3Apply ring empty flow field distribution map behind the back pressure 0.2MPa under the/min.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further.
In Fig. 1; 1 combination can produce a pressure drop through the step-down nozzle because the Dual-Phrase Distribution of Gas olid body that mineshaft annulus 8 is returned out is from sediment outflow pipeline arrival end 3; And this pressure drop is the back pressure value that annular space well head 7 needs control, and this back pressure value can be used gas drilling to fall erosion back pressure control analysis software and under given gas injection pressure and discharge capacity, calculate.According to this back pressure value; Preferably can wellhead back pressure be controlled under this injection pressure and the discharge capacity this back pressure value up and down 0.1MPa 1 combination of step-down nozzle and recommend the installation interval between 1 combination of step-down nozzle; When making the high speed Dual-Phrase Distribution of Gas olid through mineshaft annulus 8, wellhead blowout preventor combination 5, down-hole equipment 6, sediment outflow pipeline 2 and sediment outflow pipeline bent sub 9; Its flowing velocity is lower than the critical erosion speed of each pipeline of flowing through, thereby reaches the purpose that reduces erosion.
In Fig. 2, can find out from the erosion effect, be 1.0MPa in the design injection pressure, when back pressure is 0MPa, surpassed the erosion critical speed apart from annular space well head 300m well section gas-solid phase speed, site operation need add back pressure.
In Fig. 3; Falling erosion back pressure control analysis computed in software result through gas drilling can draw: add the 0.2MPa back pressure at the annular space well head; Can guarantee that flow velocity is taken between rock speed and the erosion critical speed between minimum in the annular space, reduce of the erosion effect of high speed gas-solid phase down-hole equipment 6.

Claims (1)

1. erosion reducing system for gas drilling; It comprises conventional gas drilling well control equipment; Erosion back pressure control analysis software falls in the gas drilling that it is characterized in that: further comprising improved sediment outflow pipeline, step-down nozzle and be configured on the terminal computer, and described gas drilling falls erosion back pressure control analysis software and comprises and fall erosion back pressure control analysis module and nozzle installation site analysis module;
Sediment outflow pipeline arrival end (3) directly connects the well head blowout preventer set and closes (5), and step-down nozzle (1) is installed between the sediment outflow pipeline arrival end (3) and the sediment outflow pipeline port of export (4);
The input parameter that falls erosion back pressure control analysis module comprises gas injection pressure and discharge capacity, and its output parameter is included in annular space gas-solid phase erosion critical speed and the control fluid velocity is taken the back pressure value between rock flow body speed and the control erosion critical speed between assurance; The output of falling erosion back pressure control analysis module is connected with the input of nozzle installation site analysis module, nozzle installation site analysis module utilize the back pressure value calculate different step-down abilities step-down nozzle (1) combination and recommend the installation interval between the step-down nozzle (1).
CN200910059174A 2009-04-29 2009-04-29 Erosion reducing system for gas drilling Expired - Fee Related CN101545358B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200910059174A CN101545358B (en) 2009-04-29 2009-04-29 Erosion reducing system for gas drilling

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Application Number Priority Date Filing Date Title
CN200910059174A CN101545358B (en) 2009-04-29 2009-04-29 Erosion reducing system for gas drilling

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CN101545358A CN101545358A (en) 2009-09-30
CN101545358B true CN101545358B (en) 2012-10-03

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102493767A (en) * 2011-12-02 2012-06-13 西南石油大学 Gas well-drilling erosion experiment method
CN105628529B (en) * 2014-10-30 2019-05-07 中国石油天然气股份有限公司 Wellhead equipment erosion simulation system and method
CN108776075B (en) * 2018-07-10 2021-01-08 长江大学 Testing device and testing method for simulating erosion wear of underground drill rod

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890547A (en) * 1994-10-12 1999-04-06 Den Norske Stats Oljeselskap A.S Pressure converter
CN101139911A (en) * 2006-09-08 2008-03-12 西南石油大学 Gas injection pressure-stabilizing drilling method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5890547A (en) * 1994-10-12 1999-04-06 Den Norske Stats Oljeselskap A.S Pressure converter
CN101139911A (en) * 2006-09-08 2008-03-12 西南石油大学 Gas injection pressure-stabilizing drilling method

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