CN104196490A - Automatic well mouth pressure relief device and method for overflow shut-in - Google Patents
Automatic well mouth pressure relief device and method for overflow shut-in Download PDFInfo
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- CN104196490A CN104196490A CN201410402265.4A CN201410402265A CN104196490A CN 104196490 A CN104196490 A CN 104196490A CN 201410402265 A CN201410402265 A CN 201410402265A CN 104196490 A CN104196490 A CN 104196490A
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Abstract
The invention discloses an automatic well mouth pressure relief device for overflow shut-in. The automatic well mouth pressure relief device for overflow shut-in comprises a main pressure relief pipe, a standby pressure relief pipe and a main flow pipe, wherein the inlet end A of a four-way pipe I (1) is connected with a second manual valve (5), a check valve (4) is connected onto the second manual valve (5), the main pressure relief pipe consists of a third manual valve (6), a target-shaped elbow A (7), a first overflow valve (8) and a target-shaped elbow B (9), the third manual valve (6), the target-shaped elbow A (7), the first overflow valve (8) and the target-shaped elbow B (9) are connected between the outlet end B of the four-way pipe I (1) and the inlet end B of a four-way pipe II (3), and the standby pressure relief pipe consists of a fourth manual valve (10), a target-shaped elbow C (11), a second overflow valve (12) and a target-shaped elbow D (13). The invention further discloses a pressure relief method. The automatic well mouth pressure relief device and method for overflow shut-in has the advantages of being compact in structure, high in reliability, simple in operation and high in pressure control accuracy and automation degree.
Description
Technical field
The present invention relates to oil/gas drilling wellhead assembly technical field, particularly a kind of well head automatic pressure relief device and method thereof for overflow closing well.
Background technology
Along with deepening continuously of Oil And Gas Exploration And Development, oil gas drilling process becomes very complicated, and the risk and the pressure that in drilling process, face are progressively increased.In drilling process, because drilling fluid density is too small, or bore and meet abnormal stratum, cause bottom pressure to be less than bottom pore pressure, while especially getting into gas-bearing formation, will cause the gas in stratum to enter in pit shaft.Because strata pressure is greater than wellbore pressure, gas is constantly poured in pit shaft, form gas column.Find, after well kick, to close preventer.Now, due to the impact of the factors such as de'collement, the gas column in shaft bottom will move to well head.At the closing well initial stage, bottom pressure and strata pressure Negative Pressure Difference are large, and it is fast that formation fluid is invaded speed.Along with fluid continues to invade, well head pressure rises.Now bottom pressure and strata pressure Negative Pressure Difference further reduce, thereby it is more and more slower to cause formation fluid to be invaded.When well head pressure reaches certain value, bottom pressure will equal strata pressure, and now formation fluid will no longer enter well, but for gas cut, gas will rise in slippage, and drilling fluid moves down, thereby make well head pressure continue to raise.Now bottom pressure also will increase, and when bottom pressure is during higher than formation pore pressure and formation pore flow resistance sum, the well fluids downhole in well may turn back in stratum.When bottom pressure continues to increase, the generation of the situation such as may cause that casing shoe breaks, produces serious consequence.
For the ever-increasing situation of well head pressure, general employing regulates choke valve, makes well head pressure keep method within the specific limits.But, adopt manual method to regulate well head pressure, need to constantly pay close attention to surface casing pressure and vertical pressure value, and may produce the situations such as misoperation, follow-up kill-job failure probability is increased, the bearing capacity of wellhead assembly has been caused and had a strong impact on simultaneously, the safety of whole process has been produced to challenge simultaneously, accuracy has also been exerted an influence.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, provide a kind of compact conformation, reliability is high, simple to operate, pressure controling precision is high, automaticity is high, alleviate well head automatic pressure relief device and the method thereof for overflow closing well of labor strength.
Object of the present invention is achieved through the following technical solutions: a kind of well head automatic pressure relief device for overflow closing well, it comprises main pressure relief pipeline, standby pressure relief pipeline and main flow pipeline, main flow pipe route cross I, first-hand movable valve and cross II form, between the port of export C of described cross I and the arrival end A of cross II, be connected with first-hand movable valve, the arrival end A of cross I is connected with second-hand's movable valve, on second-hand's movable valve, be connected with one way valve, described main pressure relief pipeline is by the 3rd manually-operated gate, target type elbow A, the first overflow valve and target type elbow B form, the port of export B of described cross I is to the 3rd manually-operated gate that has been linked in sequence between the arrival end B of cross II, target type elbow A, the first overflow valve and target type elbow B, described standby pressure relief pipeline is by the 4th manually-operated gate, target type elbow C, the second overflow valve and target type elbow D form, the port of export D of described cross I is to the 4th manually-operated gate that has been linked in sequence between the arrival end D of cross II, target type elbow C, the second overflow valve and target type elbow D.
On described cross I, be provided with for measuring the pressure sensor of hydraulic pressure in cross I.
For a method for the well head automatically unloading of overflow closing well, it comprises the following steps:
S1, the arrival end of the port of export of cross II and one way valve is connected on the pipeline between choke manifold and well head;
S2, the pressure can bear according to preventer and choke manifold are set opening pressure value in advance on the first overflow valve and the second overflow valve;
S3, open first-hand movable valve, second-hand's movable valve and the 3rd manually-operated gate, the fluid that well head overflows flows out from the port of export C of cross II through one way valve, second-hand's movable valve, cross I and first-hand movable valve successively;
S4, when overflow closing well, along with the pressure of well head constantly increases, when well head pressure reaches the opening pressure value of the first overflow valve, the first overflow valve is opened, part fluid flows out from the port of export C of cross II through port of export B, the 3rd manually-operated gate, target type elbow A, the first overflow valve, the target type elbow B of cross I successively, thereby has realized the release of fluid pressure;
S5, when main pressure relief pipeline has damage, close the 3rd manually-operated gate and open the 4th manually-operated gate simultaneously, now the second overflow valve comes into operation.
The present invention has the following advantages: (1) the present invention sets opening pressure value before use in advance on the first overflow valve, when at overflow closing well, continuous increase along with well head pressure, the first overflow valve can be controlled well head pressure within the specific limits, thereby the first overflow valve is opened and is realized automatically unloading after fluid pressure increases to certain value, therefore, needn't Artificial Control well head pressure, alleviate workman's labour intensity, there is feature simple to operate, automaticity is high, easy to use.(2) the present invention also comprises standby pressure relief pipeline, when main pressure relief pipeline breaks down, standby pressure relief pipeline replaces its work, thereby avoids producing the function that cannot realize automatically unloading, can be convenient to main release path fault eliminating work, there is the feature safe, reliability is high simultaneously.(3) on cross I of the present invention, be provided with for measuring the pressure sensor of hydraulic pressure in cross I, thereby can easily realize pressure data is real-time transmitted to computer terminal, so that Long-distance Control.(4) when the present invention considers release, fluid pressure is larger, adopts target type elbow when pipeline is turned, and has avoided fluid directly to impact tube wall, has strengthened pipeline application life.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
In figure, 1-cross I, the first-hand movable valve of 2-, 3-cross II, 4-one way valve, 5-second-hand's movable valve, 6-the 3rd manually-operated gate, 7-target shape elbow A, 8-the first overflow valve, 9-target type elbow B, 10-the 4th manually-operated gate, 11-target type elbow C, 12-the second overflow valve, 13-target type elbow D, 14-pressure sensor.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention will be further described, and protection scope of the present invention is not limited to the following stated:
As shown in Figure 1, a kind of well head automatic pressure relief device and method thereof for overflow closing well, it comprises main pressure relief pipeline, standby pressure relief pipeline and main flow pipeline, main flow pipe route cross I1, first-hand movable valve 2 and cross II3 form, between the port of export C of described cross I1 and the arrival end A of cross II3, be connected with first-hand movable valve 2, the arrival end A of cross I1 is connected with second-hand's movable valve 5, is connected with one way valve 4 on second-hand's movable valve 5.As shown in Figure 1, main pressure relief pipeline is by the 3rd manually-operated gate 6, target type elbow A7, the first overflow valve 8 and target type elbow B9 form, the port of export B of cross I1 is to the 3rd manually-operated gate 6 that has been linked in sequence between the arrival end B of cross II3, target type elbow A7, the first overflow valve 8 and target type elbow B9, before use, first on the first overflow valve 8, set opening pressure value, when at overflow closing well, continuous increase along with well head pressure, the first overflow valve 8 can be controlled well head pressure within the specific limits, thereby the first overflow valve 8 is opened and is realized automatically unloading after fluid pressure increases to certain value, therefore, needn't Artificial Control well head pressure, alleviated workman's labour intensity, have simple to operate, the feature that automaticity is high, easy to use.As shown in Figure 1, standby pressure relief pipeline is comprised of the 4th manually-operated gate 10, target type elbow C11, the second overflow valve 12 and target type elbow D13, the port of export D of described cross I1 is to the 4th manually-operated gate 10 that has been linked in sequence between the arrival end D of cross II3, target type elbow C11, the second overflow valve 12 and target type elbow D13, when main pressure relief pipeline breaks down, standby pressure relief pipeline replaces its work, thereby avoid producing the function that cannot realize automatically unloading, can be convenient to main release path fault eliminating work, there is the feature safe, reliability is high simultaneously.
As shown in Figure 1, on cross I1, be provided with for measuring the pressure sensor 14 of hydraulic pressure in cross I1, can easily realize pressure data is real-time transmitted to computer terminal, so that Long-distance Control.As shown in Figure 1, first-hand movable valve 2, second-hand's movable valve 5, the 3rd manually-operated gate 6 and the 4th manually-operated gate 10 are two-way valve, and all can cut off the flow direction of fluid.
As shown in Figure 1, a kind of method of the well head automatically unloading for overflow closing well, it comprises the following steps:
S1, the arrival end of the port of export of cross II3 and one way valve 4 is connected on the pipeline between choke manifold and well head;
S2, the pressure can bear according to preventer and choke manifold are set opening pressure value in advance on the first overflow valve 8 and the second overflow valve 12;
S3, open first-hand movable valve 2, second-hand's movable valve 5 and the 3rd manually-operated gate 6, the fluid that well head overflows flows out from the port of export C of cross II3 through one way valve 4, second-hand's movable valve 5, cross I1 and first-hand movable valve 2 successively;
S4, when overflow closing well, along with the pressure of well head constantly increases, when well head pressure reaches the opening pressure value of the first overflow valve 8, the first overflow valve 8 is opened, part fluid flows out from the port of export C of cross II3 through port of export B, the 3rd manually-operated gate 6, target type elbow A7, the first overflow valve 8, the target type elbow B9 of cross I1 successively, thereby has realized the release of fluid pressure;
S5, when main pressure relief pipeline has damage, close the 3rd manually-operated gate 6 and open the 4th manually-operated gate 10 simultaneously, now the second overflow valve 12 comes into operation, and avoids producing the function cannot realize automatically unloading, can be convenient to main release path fault eliminating work simultaneously.
Claims (3)
1. the well head automatic pressure relief device for overflow closing well, it is characterized in that: it comprises main pressure relief pipeline, standby pressure relief pipeline and main flow pipeline, main flow pipe route cross I(1), first-hand movable valve (2) and cross II(3) form, described cross I(1) port of export C and cross II(3) arrival end A between be connected with first-hand movable valve (2), cross I(1) arrival end A is connected with second-hand's movable valve (5), on second-hand's movable valve (5), be connected with one way valve (4), described main pressure relief pipeline is by the 3rd manually-operated gate (6), target type elbow A(7), the first overflow valve (8) and target type elbow B(9) form, described cross I(1) port of export B is to cross II(3) arrival end B between the 3rd manually-operated gate (6) that has been linked in sequence, target type elbow A(7), the first overflow valve (8) and target type elbow B(9), described standby pressure relief pipeline is by the 4th manually-operated gate (10), target type elbow C(11), the second overflow valve (12) and target type elbow D(13) form, described cross I(1) port of export D is to cross II(3) arrival end D between the 4th manually-operated gate (10) that has been linked in sequence, target type elbow C(11), the second overflow valve (12) and target type elbow D(13).
2. a kind of well head automatic pressure relief device for overflow closing well according to claim 1, is characterized in that: described cross I(1), be provided with for measuring cross I(1) pressure sensor (14) of interior hydraulic pressure.
3. according to the method for a kind of well head automatically unloading for overflow closing well described in any one in claim 1 and 2, it is characterized in that: it comprises the following steps:
S1, by cross II(3) the port of export and the arrival end of one way valve (4) be connected on the pipeline between choke manifold and well head;
S2, the pressure that can bear according to preventer and choke manifold are in advance in the first overflow valve (8) and the upper opening pressure value of setting of the second overflow valve (12);
S3, open first-hand movable valve (2), second-hand's movable valve (5) and the 3rd manually-operated gate (6), the fluid that well head overflows is successively through one way valve (4), second-hand's movable valve (5), cross I(1) and first-hand movable valve (2) from cross II(3) port of export C flow out;
S4, when overflow closing well, along with the pressure of well head constantly increases, when well head pressure reaches the opening pressure value of the first overflow valve (8), the first overflow valve (8) is opened, part fluid is successively through cross I(1) port of export B, the 3rd manually-operated gate (6), target type elbow A(7), the first overflow valve (8), target type elbow B(9) from cross II(3) port of export C flow out, thereby realized the release of fluid pressure;
S5, when main pressure relief pipeline has damage, close the 3rd manually-operated gate (6) and open the 4th manually-operated gate (10) simultaneously, now the second overflow valve (12) comes into operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410402265.4A CN104196490A (en) | 2014-08-15 | 2014-08-15 | Automatic well mouth pressure relief device and method for overflow shut-in |
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| CN201410402265.4A CN104196490A (en) | 2014-08-15 | 2014-08-15 | Automatic well mouth pressure relief device and method for overflow shut-in |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983350A (en) * | 2021-04-14 | 2021-06-18 | 盐城佰信石油机械有限公司 | Wellhead back pressure regulation and control method and device |
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| US20040065477A1 (en) * | 2002-10-04 | 2004-04-08 | Halliburton Energy Services, Inc. | Well control using pressure while drilling measurements |
| CN201024984Y (en) * | 2007-03-07 | 2008-02-20 | 中国石油天然气股份有限公司 | Automatic control tube assembly for surrounding air pressure |
| CN201778705U (en) * | 2010-07-22 | 2011-03-30 | 中国石油天然气集团公司 | Pressure control drilling throttle device with two-stage throttling function |
| CN102359353A (en) * | 2011-09-22 | 2012-02-22 | 中国石油集团川庆钻探工程有限公司 | Closed-loop controlled-pressure well drilling system |
| CN103256015A (en) * | 2013-05-06 | 2013-08-21 | 中国石油大学(北京) | Wellhead back pressure controlling system of managed pressure drilling and wellhead back pressure controlling method |
| CN204002692U (en) * | 2014-08-15 | 2014-12-10 | 西南石油大学 | A kind of well head automatic pressure relief device for overflow closing well |
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2014
- 2014-08-15 CN CN201410402265.4A patent/CN104196490A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040065477A1 (en) * | 2002-10-04 | 2004-04-08 | Halliburton Energy Services, Inc. | Well control using pressure while drilling measurements |
| CN201024984Y (en) * | 2007-03-07 | 2008-02-20 | 中国石油天然气股份有限公司 | Automatic control tube assembly for surrounding air pressure |
| CN201778705U (en) * | 2010-07-22 | 2011-03-30 | 中国石油天然气集团公司 | Pressure control drilling throttle device with two-stage throttling function |
| CN102359353A (en) * | 2011-09-22 | 2012-02-22 | 中国石油集团川庆钻探工程有限公司 | Closed-loop controlled-pressure well drilling system |
| CN103256015A (en) * | 2013-05-06 | 2013-08-21 | 中国石油大学(北京) | Wellhead back pressure controlling system of managed pressure drilling and wellhead back pressure controlling method |
| CN204002692U (en) * | 2014-08-15 | 2014-12-10 | 西南石油大学 | A kind of well head automatic pressure relief device for overflow closing well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112983350A (en) * | 2021-04-14 | 2021-06-18 | 盐城佰信石油机械有限公司 | Wellhead back pressure regulation and control method and device |
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Application publication date: 20141210 |