CN108071388A - A ground testing system and method - Google Patents

Abstract

The invention discloses a formation testing system and a method, belonging to the field of petroleum development, the system comprises a testing pipe column, a ground control cabinet, a cable with one end electrically connected with the ground control cabinet, wherein the testing pipe column comprises a positioning short section, an electric submersible pump, an L PR-N testing valve, a pressure gauge supporting cylinder, a pressure transmission valve, a packer, a sieve pipe, a pressure detonator, a perforating gun arranged at the lower end of the pressure detonator, and a cable butt joint device arranged in the oil pipe between the positioning short section and the electric submersible pump, wherein one end of the cable butt joint device is fixedly and electrically connected with the electric submersible pump, and the other end of the cable butt joint device is movably and electrically connected with the other end of the cable in the oil pipe.

Description

A ground testing system and method

technical field

The invention relates to the field of petroleum development, in particular to a formation testing device and method.

Background technique

In the process of oilfield exploration and development, oil testing is usually carried out in order to obtain reliable formation productivity data. Formation testing is widely used as a way of oil testing operations. It is mainly to test tools (including LPR-N test valves, positioning pup joints, transmission pressure valve, screen, packer, pressure detonator, perforating gun, etc.) into the wellbore to be tested, open or close the LPR-N test valve through ground operation, test the target layer, and obtain The downhole pressure is obtained, and the production samples of the test layer are obtained, and the formation is evaluated by subsequent analysis of the above downhole pressure and production samples, so as to obtain formation productivity data.

Annular Pressure Responsive (APR) tool testing is a commonly used test method for formation testing. It uses annular pressure to control well opening and closing operations. During oil testing operations, the test string used is usually Cooperate with the electric submersible pump to form a formation test for application. The formation test system includes test strings, cables, and ground control cabinets. The test strings are obtained by connecting a variety of related test tools in a certain order using multiple oil pipes. As a test tool for the test string, the electric submersible pump needs to be placed For operations in the wellbore, in the prior art, a cable clip is installed at intervals on the outer wall of the oil pipe to fix the cable. The electric connection between them is convenient for the electric submersible pump to discharge the production fluid in the well to the outside of the well to obtain the production samples of the test layer under the command of the ground control cabinet, and it is also convenient to transmit the monitored downhole pressure to the ground control cabinet.

The inventor finds that the prior art has at least the following problems:

In the prior art, it takes a lot of time to install a plurality of cable clamps on the outer wall of the oil pipe and fix the cables, resulting in a long working time.

Contents of the invention

The technical problem to be solved by the embodiments of the present invention is to provide an accurate and efficient stratum testing system and method with short operation time. The specific technical scheme is as follows:

In the first aspect, an embodiment of the present invention provides a formation testing system, which includes a test string, a ground control cabinet, and a cable that is electrically connected to the ground control cabinet at one end, and the test string includes a plurality of oil pipes from top to bottom. Positioning nipples, electric submersible pumps, LPR-N test valves, pressure gauge holders, pressure transmission valves, packers, screens, pressure detonators connected in sequence;

a perforating gun arranged at the lower end of the pressure detonator;

The cable docking device arranged inside the oil pipe between the positioning nipple and the electric submersible pump, one end of the cable docking device is fixed and electrically connected to the electric submersible pump, and the other end is connected to the oil pipe in the oil pipe The other end of the cable is electrically connected.

Specifically, preferably, the cable docking device includes: a docking body, an upper connector that is movably electrically connected to the docking body, and a lower connector that is fixedly and electrically connected to the docking body;

Moreover, the upper joint and the lower joint are fixedly electrically connected to the cable and the electric submersible pump respectively.

Specifically, preferably, the upper end of the docking body is provided with a groove; The docking body is electrically connected with the upper connector.

Specifically, preferably, the test string further includes a reverse circulation valve, which is arranged between the electric submersible pump and the LPR-N test valve through the oil pipe.

Specifically, preferably, the test string further includes a shock absorber connected to the upper end of the pressure detonator.

Specifically, preferably, the formation testing system further includes a cable blowout prevention box, which is arranged at the upper end of the wellhead Christmas tree of the testing wellbore.

Specifically, preferably, the formation testing system further includes a cabinet loading vehicle, the ground control cabinet is placed on the cabinet loading vehicle, and the cabinet loading vehicle is provided with a roller assembly for lifting and unloading the cables.

Specifically, as a preference, the positioning sub, the electric submersible pump, the reverse circulation valve, the LPR-N test valve, the pressure gauge holder, the pressure transmission valve, and the packer , the screen pipe, and the pressure detonator are all threadedly connected to the oil pipe.

Specifically, preferably, the packer is an RTTS packer.

In a second aspect, an embodiment of the present invention provides a method for using the above-mentioned system to perform formation testing, the method comprising:

Run the test string into the test wellbore, locate the position to be tested by positioning the nipple, set the packer at the position to be tested, pressurize the annular space and open the LPR-N test valve to realize the well opening, and pass the pressure transmission valve to the Annulus pressure above the packer is transferred below the packer to activate a pressure detonator to cause a perforating gun to perforate a test formation whose output samples pass through the screen into the Test the pipe string, then release the annular pressure and close the LPR-N test valve to realize the well shut-in, and obtain the downhole pressure through the pressure gauge holder;

Subsequently, the annulus is suppressed and the LPR-N test valve is opened again to open the well, the cable is lowered into the oil pipe and connected with the cable docking device, so that the ground control cabinet is electrically connected to the electric submersible pump, and the electric submersible pump row is powered on. liquid, to obtain the output sample;

Subsequently, the LPR-N test valve was closed to shut down the well after the pressure relief of the annular space, and the downhole pressure was obtained again through the pressure gauge holder to complete the test operation.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

The formation testing system with the above-mentioned structure provided by the embodiment of the present invention can accurately and efficiently obtain the downhole pressure at different times and the output samples of the testing layer through the application of the APR testing string and the electric submersible pump. Subsequent analysis to obtain formation productivity data. In particular, by using the cable docking device, when the electric submersible pump needs to be turned on, the cable can be directly lowered into the oil pipe to conveniently and easily realize the docking with the cable docking device, thereby quickly and effectively realizing the connection between the electric submersible pump and the ground control cabinet. Electrical connection (this can also ensure that the pump efficiency of the electric submersible pump is improved). It can be seen that the stratum testing system provided by the embodiment of the present invention can not only perform stratum testing accurately and efficiently, but also is convenient and quick to operate, which effectively reduces working time and improves testing efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural view of a formation testing system provided by an embodiment of the present invention;

Fig. 2 is a cross-sectional view of the cable docking device provided by the embodiment of the present invention.

The reference signs represent respectively:

1 Test pipe string, 101 Positioning nipple, 102 Electric submersible pump, 103 LPR-N test valve, 104 Pressure gauge holder, 105 Pressure transmission valve, 106 Packer, 107 Screen pipe, 108 Pressure detonator, 109 Perforation Gun, 110 cable docking device, 1101 docking body, 1102 upper connector, 1103 lower connector, 111 reverse circulation valve, 112 shock absorber;

2 ground control cabinets;

3 cables;

4 tubing;

5 cable anti-splash box;

6 Christmas trees;

7 cabinet loading carts.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The embodiment of the present invention provides a formation testing system. As shown in FIG. Including: positioning nipple 101, electric submersible pump 102, LPR-N test valve 103, pressure gauge holder 104, pressure transmission valve 105, packer 106, screen 107. The pressure detonator 108; the perforating gun 109 arranged at the lower end of the pressure detonator 108; the cable docking device 110 arranged inside the tubing 4 between the positioning nipple 101 and the electric submersible pump 102, one end of the cable docking device 110 is connected to the electrical The submersible pump 102 is electrically connected fixedly, and the other end is electrically connected with the other end of the cable 3 in the oil pipe 4 .

The working principle of the formation testing system provided by the embodiments of the present invention is described below:

When formation testing is required, the test pipe string 1 is first lowered into the pretreated test wellbore, and the position to be tested (corresponding to the test layer) is positioned in the test wellbore through the positioning nipple 101. After the positioning is completed, at the test position Set the packer 106 to fix the test string 1 in the test wellbore. Then, the LPR-N test valve 103 was opened by pressing the annular space for the first well opening. The pressure of the annular space above the packer 106 is transferred to the bottom of the packer 106 through the pressure transfer valve 105 to activate the pressure detonator 108 to ignite the perforating gun 109 so that the perforating gun 109 can shoot the test layer. At this time, the production sample of the test layer enters the test string 1 through the screen 107, and then the LPR-N test valve 103 is closed through the annular pressure relief to perform the first well shut-in, and the downhole pressure is obtained through the pressure gauge holder 104.

Subsequently, the LPR-N test valve 103 is opened again through annular pressure to carry out the second well opening, and then the cable 3 is lowered into the oil pipe 4 and connected with the cable docking device 110. At this time, the cable 3 and the cable docking device 110 are electrically connected, and then The electrical connection between the ground control cabinet 2 and the electric submersible pump 102 is realized. Subsequently, under the control of the ground control cabinet 2, the electric submersible pump 102 is energized to discharge liquid as required, and the output sample of the above-mentioned test layer is discharged to the well, and then the output sample is obtained, so as to facilitate the follow-up. samples for analysis and evaluation.

Subsequently, close the LPR-N test valve 103 through annular pressure relief to perform the second well shut-in, and obtain the downhole pressure during the second opening and closing of the well through the pressure gauge holder 104, and when the test string 1 is pulled out Read the pressure data recorded by the pressure gauge holder 104, and then perform subsequent analysis and evaluation.

As can be seen from the above, the formation testing system with the above structure provided by the embodiment of the present invention can accurately and efficiently obtain the downhole pressure and the output of the test layer at different times by using the APR test string 1 and the electric submersible pump 102 together. samples and their subsequent analysis to obtain formation productivity data. In particular, by using the cable docking device 110, when the electric submersible pump 102 needs to be turned on, the cable 3 can be directly lowered into the oil pipe 4 to conveniently and easily realize the docking with the cable docking device 110, thereby quickly and effectively realizing the electric submersible pump. 102 is electrically connected to the ground control cabinet 2 (this can also ensure that the pump efficiency of the electric submersible pump 102 is improved). It can be seen that the stratum testing system provided by the embodiment of the present invention can not only perform stratum testing accurately and efficiently, but also is convenient and quick to operate, which effectively reduces working time and improves testing efficiency.

It should be noted that in the formation test system provided by the embodiment of the present invention, the positioning nipple 101, the electric submersible pump 102, the LPR-N test valve 103, the pressure gauge holder 104, the pressure transmission valve 105, the packer 106, the screen The pipe 107, the pressure detonator 108, and the perforating gun 109 are common formation testing tools in the field, and a brief overview of them will be given below:

Specifically, the positioning nipple 101 is a short casing used to accurately measure the depth of oil and gas layers during perforation, and is generally set around 30m above the top of the target test layer. The common positioning sub 101 in this field is a gamma magnetic positioning sub, which is based on the magnetic positioning depth correction technology. Before perforating, a magnetic probe is run in, and natural gamma (GR) and magnetic positioning (CCL) oil jackets are used. The composite perforation correction technology is used to obtain the perforation correction (for the specific principle, please refer to the application of the magnetic positioning curve and the gamma curve disclosed by Shu Yigang in "Petroleum Instruments" (Vol. 21, No. 3, 2007)). In "Petroleum Instruments" (December 2014), Zhang Kailiang and others disclosed a structure of a gamma magnetic positioning subsection. Those skilled in the art can also obtain the positioning sub-joint 101 from the market, for example, the magnetic positioning sub-joint sold by Tianjin Dalip Petroleum Pipe Co., Ltd.

The electric submersible pump 102 is also called an electric submersible centrifugal pump, which is generally composed of an underground part, a surface part, and a cable 3 for realizing the electrical connection between the downhole part and the surface part. The cabinet 2 includes a transformer, a controller and a junction box. The ground control cabinet 2 is used to control the opening and closing of the electric submersible pump 102, and to receive formation information collected by the electric submersible pump 102, such as data such as formation temperature. The downhole part of the electric submersible pump 102 mainly includes a multistage centrifugal pump, a submersible motor, a protector, etc. The submersible motor is electrically connected with the cable 3, and is started or closed under the action of the ground control cabinet 2, and drives the multistage centrifugal pump. Perform drainage work. For example, the 200QJ20 series well electric submersible pump produced and sold by Taizhou Jiangfeng Pump Industry Co., Ltd. can be applied to the present invention; Type submersible pumps are also applicable to the present invention.

The LPR-N test valve 103, also known as the LPR-N valve, is a common APR test tool, which realizes well opening through annular pressure, and realizes well shut-in through annular pressure relief, and is also used to assist in obtaining production samples. For example, the LPR-N test valve 103 includes a ball valve part and a power part. Among them, the ball valve part mainly includes the eccentric ball, the outer cylinder of the ball valve, and the operating arm, and the power part mainly includes the power mandrel and the nitrogen chamber. During operation, after the packer 106 is set, the annulus of the wellbore is filled with nitrogen to pressurize. The pressure acts on the moving mandrel to compress the nitrogen, and the power mandrel moves down to drive the operating arm to rotate and open the ball valve to realize well opening. Then the annular space is depressurized, and under the action of nitrogen, the power mandrel moves up to drive the power arm to rotate and close the ball valve to realize well shut-in. More detailed information on the LPR-N test valve 103 can be found in various documents, such as the working status of the LPR-N test valve disclosed in "Oil and Gas Well Test" (2002,11(1):46-48) by Liu Haitao et al. The embodiments of the present invention will not be described too much here regarding the pressure change of the nitrogen chamber, or related disclosures on APR test tools on various websites. Of course, those skilled in the art can also obtain the LPR-N test valve 103 through commercial purchase, such as the LPR-N valve produced and sold by Baoji Mengtai Petroleum Machinery Co., Ltd.

The pressure gauge holder 104 is an important technical equipment in the field of well logging technology. In the embodiment of the present invention, the pressure gauge holder 104 includes a holder body and a pressure gauge built in the holder body. The pressure gauge has a memory function. The downhole pressure in different time periods can be measured and memorized, so that it can be read on demand after being pulled out of the well. Specifically, two pressure gauges can be installed in the support tube body of the pressure gauge support tube to measure the internal pressure and external pressure of the test pipe string 1 respectively. When the test pipe string 1 is pulled out at the end of the formation test operation, the pressure data on the pressure gauge can be read according to the operation time period, and then the pressure changes in different time periods can be seen to draw a pressure curve. Those skilled in the art can obtain the pressure gauge holder 104 from the market, for example, a pressure gauge holder specially installed with a direct-reading pressure gauge sold by Daqing Saiensi Electronic Instrument Equipment Co., Ltd. with the model number TT110/45Z2SA.

In the embodiment of the present invention, the pressure transmission valve 105 is used to transfer the annular pressure above the packer 106 to below the packer 106 to start the pressure detonator 108, and then make the perforating gun 109 perforate the test layer. Technicians can also obtain it through commercial purchases, such as the model 250A-65 pneumatic pressure transmission valve sold by Zhuhai Lingkong Automation Equipment Co., Ltd.

The pressure detonator 108 and the perforating gun 109 are common perforating tools, wherein the pressure detonator 108 is provided with a closed ignition head to drive the perforating gun 109 to perform perforating operations. For the structure of the pressure detonator 108, please refer to The development and application of the full bore pressure detonator disclosed by Lu Xuebin et al. in "Engineering Blasting" (Vol. 15, No. 4, December 2009), the embodiment of the present invention will not be described too much here. In addition, the perforating gun 109 can be obtained by purchasing the perforating gun 109 sold by Renqiu Chenyang Metal Products Co., Ltd.; the screen 107 can be obtained by purchasing the oil screen sold by Hebei Rui Naier Petroleum Pipeline Equipment Co., Ltd.

In the embodiment of the present invention, as shown in FIG. 2 , the cable docking device 110 includes: a docking body 1101 , an upper connector 1102 that is movably and electrically connected to the docking body 1101 , and a lower connector 1103 that is fixedly and electrically connected to the docking body 1101 ; and , the upper joint 1102 and the lower joint 1103 are fixedly electrically connected with the cable 3 and the electric submersible pump 102 respectively. It can be understood that cables 3 are correspondingly provided in the docking body 1101 , the upper connector 1102 and the lower connector 1103 to realize electrical connection with each other. The above-mentioned cable docking device 110 is not only simple in structure, but also easy to operate. The upper connector 1102 can be pre-connected to the end of the cable 3. In application, the cable 3 with the upper connector 1102 is lowered into the oil pipe 4, and the connection between the cable 3 and the electric cable is realized by connecting the upper connector 1102 with the docking body 1101. Electrical connection of submersible pump 102 .

Further, in order to make the docking between the upper joint 1102 and the docking body 1101 more convenient and quick, the upper end of the docking body 1101 is provided with a groove, and the upper joint 1102 is configured as a protrusion matching the groove. When the protrusion is inserted into the groove, the docking body 1101 is electrically connected with the upper connector 1102 . Wherein, the shape of the groove at the upper end of the docking body 1101 can be various, for example, it can be a cylindrical groove, an arc-shaped groove, a triangular groove, etc. It can be understood that at this time, the upper joint 1102 There are also many structures in which the shape of the bump corresponds to the structure of the groove. For example, it can be a cylindrical bump, an arc-shaped bump, a triangular bump, etc. that are compatible with the groove, so that the butt joint can also be made The body 1101 is docked and fastened with the upper joint 1102 to ensure that the cable docking device 110 has good electrical conductivity.

In the embodiment of the present invention, the test string 1 further includes a reverse circulation valve 111 , which is arranged between the electric submersible pump 102 and the LPR-N test valve 103 through the oil pipe 4 . After the test operation is completed, in order to keep the wellbore clean, the embodiment of the present invention opens the reverse circulation valve 111 by pressing the annulus to kill the well in circulation for flushing, and then the cable 3 can be pulled out. For example, the reverse circulation valve produced and sold by Puyang Kerui Mechanical Engineering Technology Co., Ltd. is applicable to the present invention.

In the embodiment of the present invention, the test string 1 further includes a shock absorber 112 connected to the upper end of the pressure detonator 108 . During the test operation, in order to ensure the safety of downhole tools such as the test pipe string 1 and the cable 3, the embodiment of the present invention uses the shock absorber 112 to reduce the instantaneous high pressure and strong vibration generated when the perforating gun 109 detonates, so as to protect the test pipe Purpose of Column 1. For example, the SJ type two-way shock absorber produced and sold by Shandong China Coal Mining Materials Group Co., Ltd. is suitable for the present invention.

Further, preferably, the formation testing system further includes a cable blowout prevention box 5 arranged on the upper end of the Christmas tree 6 . It should be noted that a wellhead Christmas tree 6 is provided at the wellhead of each applicable test wellbore, so as to facilitate the tripping of the pipe string. The cable 3 enters the tubing 4 through the cable blowout preventer box 5 and the Christmas tree 6 in turn, and the cable 3 can be effectively sealed by installing the cable blowout preventer box 5 to prevent fluid leakage in the well and ensure construction safety. Among them, the cable anti-blowout box 5 is common in this field, for example, Chinese patent (application number is CN200920106985.0) discloses a kind of multi-functional fast assembly type cable anti-blowout box, those skilled in the art refer to this document The cable blowout prevention box 5 can be easily prepared, and of course it can also be obtained by purchasing commercially available products.

In the embodiment of the present invention, the positioning nipple 101, the electric submersible pump 102, the reverse circulation valve 111, the LPR-N test valve 103, the pressure gauge holder 104, the pressure transmission valve 105, the packer 106, the screen pipe 107, the pressure Both the detonator 108 and the perforating gun 109 are threadedly connected with the tubing 4 . By adopting the threaded connection, not only the fast connection between each component and the oil pipe 4 is ensured, but also it is easy to disassemble, and it is easy to replace when one of the components is damaged.

In the embodiment of the present invention, the packer 106 is preferably a RTTS packer. The RTTS packer is common in the field, and it is a hanging packer with a large diameter and can seal off two-way pressure. For example, the RTTS packer includes a J-shaped slot transposition mechanism, slips, seal Spacer and hydraulic anchoring mechanism. When preparing to go downhole, the J-shaped groove is placed in the locked position, and the slips are in the retracted state. During the downhole process, when the test string reaches the test position and is ready for operation, rotate the string to the right, so that the string maintains the right-hand torque, and the test is lowered. until the packer slips begin to bear the weight of the string, and then continue to lower the test string until the packer bears the desired setting weight, and the setting is completed at this time. When the downhole formation pressure of the RTTS packer is greater than the pressure of the liquid column, the hydraulic anchoring mechanism of the packer sticks out on the casing wall, which can prevent the packer from being pushed when the pressure in the lower part of the RTTS packer is too high, resulting in loss of seal .

In the embodiment of the present invention, the formation testing system further includes a cabinet loading vehicle 7 on which the ground control cabinet 2 is placed, and the cabinet loading vehicle 7 is provided with a drum assembly for lifting and unloading the cable 3 . After the test string 1 is lowered into the wellbore, the cable 3 can be easily and quickly pulled out and lowered in the tubing 4 through the drum assembly, and can also be realized through the connection of the cable 3, the cable docking device 110 and the electric submersible pump 102. Data collection of fluids within the test layer. Among them, the ground control cabinet 2 on the cabinet loading vehicle 7 and the end of the cable 3 electrically connected to the well is provided with a drainage control system, and the electric submersible pump 102 is provided with a data acquisition system, and the drainage control system collects the data through the cable 3. Data collected by the system is transmitted uphole for subsequent analysis.

In the second aspect, based on the formation testing system provided above, an embodiment of the present invention provides a method for using the system to perform formation testing, the method comprising:

Run the test string 1 into the test wellbore, locate the position to be tested by positioning the nipple 101, set the packer 106 at the position to be tested, pressurize the annulus and open the LPR-N test valve 103 to open the well, and pass the pressure transmission The valve 105 transmits the annular pressure above the packer 106 to below the packer 106 to activate the pressure detonator 108, so that the perforating gun 109 perforates the test layer, and the output sample of the test layer enters through the screen pipe 107 Test the pipe string 1, and then close the LPR-N test valve 103 to shut down the well. During this process, obtain the downhole pressure through the pressure gauge holder 104;

Subsequently, the annular space is suppressed and the LPR-N test valve 103 is opened again to realize well opening, and the cable 3 is lowered into the oil pipe 4 and connected with the cable docking device 110, so that the ground control cabinet 2 is electrically connected with the electric submersible pump 102, and the electric submersible pump is started when the power is turned on. The pump 102 discharges liquid to obtain output samples;

Subsequently, the LPR-N test valve 103 was closed for annular pressure relief to realize well shut-in. During this process, the downhole pressure was obtained again through the pressure gauge holder 104 to complete the test operation.

Those skilled in the art can understand that before running the test string 1 into the wellbore, the wellbore needs to be dredged and scraped to remove the solid matter adhering to the inner wall of the wellbore, such as burrs and cement remaining in the wellbore. Whether the artificial well bottom formed after cementing meets the oil testing requirements. Then carry out the well flushing operation, in order to clean the wellbore, remove the solid matter or heavy oil and waxy substances adhered to the inner wall of the wellbore, so as to facilitate the construction of the lower part; at the same time, adjust the well killing fluid in the well to meet the requirements of perforation to prevent the formation from opening Finally, the sewage enters the formation and causes formation pollution.

Using the method provided by the present invention, the pressure data inside the test pipe string 1 and the output samples of the test layer during the two opening and closing processes are obtained by opening or closing the LPR-N test valve 103 through two annular pressure and pressure relief , through the follow-up analysis of the above pressure data and production samples, the expected productivity data can be obtained to realize oil testing. The construction time of this method is short, the pump efficiency of the electric submersible pump 102 is high, the operating cost is low, and it is convenient for large-scale popularization and application.

It can be understood that, in the formation testing method provided in the embodiment of the present invention, the number of times of obtaining the internal pressure of the test pipe string 1 and the output samples of the test layer for the test layer is not limited to the above, for example, it can be two or three times , Quadratic, etc., are selected according to specific well conditions to ensure the accuracy of the obtained results.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in this invention. within the scope of protection of the invention.

Claims (10)

1. a kind of formation testing system, including：Test string (1), ground control cabinet (2), one end and the ground control cabinet (2) The cable (3) of electrical connection, which is characterized in that the test string (1) includes：Sequentially connected from top to bottom by multiple oil pipes (4) Logical orientation spool (101), electric submersible pump (102), LPR-N test valves (103), manometer (104), pressure transmission valve (105), envelope Every device (106), screen casing (107), pressure detonator (108)；

It is arranged on the perforating gun (109) of the pressure detonator (108) lower end；

It is arranged on the cable butting dress of the oil pipe (4) inside between the orientation spool (101) and the electric submersible pump (102) It puts (110), described cable butt joint device (110) one end is electrically connected with the electric submersible pump (102) fixation, and the other end is in the oil pipe (4) it is electrically connected in the activity of the other end of the cable (3).

2. formation testing system according to claim 1, which is characterized in that the cable butt joint device (110) includes：It is right It connects body (1101), the top connection (1102) being electrically connected with docking body (1101) activity, dock body with described (1101) lower contact (1103) of fixed electrical connection；

Also, the top connection (1102) and the lower contact (1103) respectively with the cable (3) and the electric submersible pump (102) Fixed electrical connection.

3. formation testing system according to claim 2, which is characterized in that the upper end of the docking body (1101) is set Fluted, the top connection (1102) is arranged to the convex block being adapted with the groove, when the convex block is inserted into the groove When, the docking body (1101) is electrically connected with the top connection (1102).

4. formation testing system according to claim 1, which is characterized in that the test string (1) further includes reacting cycle Valve (111) is arranged on the electric submersible pump (102) by the oil pipe (4) and the LPR-N is tested between valve (103).

5. formation testing system according to claim 1, which is characterized in that the test string (1) further includes damper (112), the upper end with the pressure detonator (108) is connected.

6. formation testing system according to claim 1, which is characterized in that the formation testing system further includes cable and prevents Spray box (5) is arranged on the upper end of the wellhead oil tree (6) of test pit shaft.

7. formation testing system according to claim 1, which is characterized in that the formation testing system further includes cabinet dress Carrier vehicle (7), the ground control cabinet (2) is placed on the cabinet load wagon (7), and is set on the cabinet load wagon (7) It is equipped with to remove the drum assembly of the cable (3).

8. formation testing system according to claim 4, which is characterized in that the orientation spool (101), the electric submersible pump (102), the reverse circulation valve (111), LPR-N test valves (103), the manometer (104), the pressure transmission valve (105), the packer (106), the screen casing (107), the pressure detonator (108) connect with the oil pipe (4) screw thread It connects.

9. formation testing system according to claim 1, which is characterized in that the packer (106) is RTTS packers.

10. the method for carrying out formation testing using any one of the claim 1-9 systems, which is characterized in that the method bag It includes：

Test string (1) tripping in is tested in pit shaft, position to be tested is positioned by orientation spool (101), described to be tested Set packer (106) at position, annular space suppress unlatching LPR-N test valves (103) realization and drive a well, will by pressure transmission valve (105) Annular pressure above the packer (106) is transferred to below the packer (106) to start pressure detonator (108), So that perforating gun (109) carries out test layer perforation, the output sample of the test layer enters the test by screen casing (107) Tubing string (1), then annular space pressure release close the LPR-N test valves (103) and realize closing well, in the process, pass through pressure gauge support Cylinder (104) obtains down-hole pressure；

Then, annular space, which is suppressed, is again turned on LPR-N test valve (103) and realizes to drive a well, will be in cable (3) tripping in oil pipe (4) It is docked with cable butt joint device (110), so that ground control cabinet (2) is electrically connected with electric submersible pump (102), being powered, it is latent to start the electricity (102) drain is pumped, obtains the output sample；

Then, annular space pressure release closes the LPR-N test valves (103) and realizes closing well, in the process, passes through the pressure gauge support Cylinder (104) obtains down-hole pressure again, completes test jobs.